{"id":99864,"date":"2026-09-03T13:01:17","date_gmt":"2026-09-03T05:01:17","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/99864.html"},"modified":"2026-09-03T13:01:17","modified_gmt":"2026-09-03T05:01:17","slug":"java%e6%b7%b1%e5%85%a5%e8%a7%a3%e6%9e%90%e7%af%87%e5%8d%81%e4%b8%89%e4%b9%8bjava%e6%97%a5%e5%bf%97api%ef%bc%88jul%ef%bc%89%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/99864.html","title":{"rendered":"Java\u6df1\u5165\u89e3\u6790\u7bc7\u5341\u4e09\u4e4bJava\u65e5\u5fd7API\uff08JUL\uff09\u8be6\u89e3"},"content":{"rendered":"

Java\u65e5\u5fd7API（JUL）\u8be6\u89e3<\/h2>\n
\n

\u76ee\u5f55<\/h3>\n
  • \u6982\u8ff0\u4e0e\u5386\u53f2<\/li>\n
  • \u6838\u5fc3\u67b6\u6784\u4e0e\u7ec4\u4ef6\u5173\u7cfb<\/li>\n
  • Logger\u8be6\u89e3<\/li>\n
  • Level\u65e5\u5fd7\u7ea7\u522b<\/li>\n
  • Handler\u8f93\u51fa\u5904\u7406\u5668<\/li>\n
  • Formatter\u683c\u5f0f\u5316\u5668<\/li>\n
  • Filter\u8fc7\u6ee4\u5668<\/li>\n
  • LogRecord\u4e0e\u65e5\u5fd7\u6d41\u8f6c<\/li>\n
  • LogManager\u4e0e\u914d\u7f6e\u6587\u4ef6<\/li>\n
  • \u81ea\u5b9a\u4e49Handler\u4e0eFormatter<\/li>\n
  • \u4e0eSLF4J\u6865\u63a5<\/li>\n
  • \u6700\u4f73\u5b9e\u8df5\u4e0e\u5e38\u89c1\u9677\u9631<\/li>\n
  • \u7248\u672c\u6f14\u8fdb<\/li>\n
    \n

    1. \u6982\u8ff0\u4e0e\u5386\u53f2<\/h3>\n

    1.1 \u4ec0\u4e48\u662fJUL<\/h4>\n

    JUL（Java Util Logging）\u662f Java \u6807\u51c6\u5e93\u81ea\u5e26\u7684\u65e5\u5fd7\u6846\u67b6，\u5168\u90e8\u7c7b\u4f4d\u4e8e java.util.logging \u5305\u3002\u5b83\u662f JDK 1.4（2002\u5e74，JSR 47） \u5f15\u5165\u7684，\u76ee\u6807\u662f\u8ba9 Java \u5e73\u53f0\u62e5\u6709\u4e00\u4e2a\u6807\u51c6\u65e5\u5fd7\u8bbe\u65bd，\u907f\u514d Log4j 1.x \u65f6\u671f\u5404\u6846\u67b6\u5404\u81ea\u9020\u8f6e\u5b50\u7684\u5c40\u9762\u3002<\/p>\n

    \/\/ \u6700\u5c0f\u53ef\u7528\u793a\u4f8b：JDK\u5185\u7f6e，\u65e0\u9700\u4efb\u4f55\u7b2c\u4e09\u65b9\u4f9d\u8d56<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> JulHelloWorld<\/span> {<\/span>
    \n \/\/ \u63a8\u8350：\u5b58\u4e3a\u5b57\u6bb5，\u907f\u514d\u88abGC（\u89c1\u9677\u9631\u7ae0\u8282）<\/span>
    \n private<\/span> static<\/span> final<\/span> Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>JulHelloWorld<\/span>.<\/span>class<\/span>.<\/span>getName<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n logger.<\/span>info<\/span>(<\/span>"Hello, JUL!"<\/span>)<\/span>;<\/span> \/\/ \u8f93\u51fa\u5230\u63a7\u5236\u53f0（System.err）<\/span>
    \n logger.<\/span>warning<\/span>(<\/span>"\u8fd9\u662f\u4e00\u6761\u8b66\u544a"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>severe<\/span>(<\/span>"\u8fd9\u662f\u4e00\u6761\u4e25\u91cd\u9519\u8bef"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span>
    \n\/*
    \n\u8fd0\u884c\u8f93\u51fa（\u9ed8\u8ba4SimpleFormatter）：
    \n\u4e94\u6708 20, 2024 10:30:15 \u4e0a\u5348 JulHelloWorld main
    \n\u4fe1\u606f: Hello, JUL!
    \n\u4e94\u6708 20, 2024 10:30:15 \u4e0a\u5348 JulHelloWorld main
    \n\u8b66\u544a: \u8fd9\u662f\u4e00\u6761\u8b66\u544a
    \n\u4e94\u6708 20, 2024 10:30:15 \u4e0a\u5348 JulHelloWorld main
    \n\u4e25\u91cd: \u8fd9\u662f\u4e00\u6761\u4e25\u91cd\u9519\u8bef
    \n*\/<\/span><\/p>\n

    1.2 \u8bbe\u8ba1\u80cc\u666f\u4e0e\u5b9a\u4f4d<\/h4>\n\n\u65f6\u95f4\u4e8b\u4ef6<\/tr>\n\n\n\n\n\n\n
    1996<\/td>\nLog4j 0.x \u51fa\u73b0，\u6210\u4e3a\u4e8b\u5b9e\u6807\u51c6<\/td>\n<\/tr>\n
    2002<\/td>\nJDK 1.4 \u5f15\u5165 java.util.logging（JSR 47）<\/td>\n<\/tr>\n
    2004<\/td>\nSLF4J \/ Logback \u51fa\u73b0，\u89e3\u51b3\u95e8\u9762\u4e0e\u5b9e\u73b0\u5206\u79bb\u95ee\u9898<\/td>\n<\/tr>\n
    2012<\/td>\nLog4j2 \u53d1\u5e03，\u6027\u80fd\u5927\u5e45\u8d85\u8d8a<\/td>\n<\/tr>\n
    \u4eca\u5929<\/td>\nJUL \u4ecd\u662f JDK \u5185\u7f6e\u8bbe\u65bd，\u8f7b\u91cf\u573a\u666f\u4e0e\u5e93\u5f00\u53d1\u5e38\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    JUL \u7684\u4f18\u52bf：\u96f6\u4f9d\u8d56\u3001JDK \u5185\u7f6e\u3001\u65e0\u9700\u9009\u578b\u3002\u52a3\u52bf：\u914d\u7f6e\u80fd\u529b\u5f31\u3001\u65e0\u5360\u4f4d\u7b26 {}\u3001\u65e0 MDC\u3001\u65e0\u539f\u751f\u5f02\u6b65\u3001\u6027\u80fd\u4e0e\u6613\u7528\u6027\u900a\u4e8e Log4j2\/Logback\u3002<\/p>\n

    \n

    2. \u6838\u5fc3\u67b6\u6784\u4e0e\u7ec4\u4ef6\u5173\u7cfb<\/h3>\n

    2.1 \u4e94\u5927\u6838\u5fc3\u7ec4\u4ef6<\/h4>\n

    \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 \u5e94\u7528\u4ee3\u7801 \u2502
    \n\u2502 logger.info("\u7528\u6237" + id + "\u767b\u5f55") \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u25bc
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 Logger（\u8bb0\u5f55\u5668） \u2502 \u5224\u65ad\u7ea7\u522b \u2192 \u6784\u5efaLogRecord \u2192 \u5206\u53d1
    \n\u2502 \u251c\u2500 Level（\u7ea7\u522b\u9608\u503c） \u2502
    \n\u2502 \u251c\u2500 Filter（\u8fc7\u6ee4\u5668） \u2502
    \n\u2502 \u2514\u2500 Handler[]（\u5904\u7406\u5668） \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u25bc（\u53ef\u80fd\u5411\u7236Logger\u4f20\u64ad）
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 Handler（\u5904\u7406\u5668） \u2502 \u518d\u6b21\u5224\u65ad\u7ea7\u522b \u2192 \u8c03\u7528Formatter \u2192 \u8f93\u51fa
    \n\u2502 \u251c\u2500 Level（\u7ea7\u522b\u9608\u503c） \u2502
    \n\u2502 \u251c\u2500 Filter（\u8fc7\u6ee4\u5668） \u2502
    \n\u2502 \u2514\u2500 Formatter（\u683c\u5f0f\u5316\u5668）\u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u25bc
    \n \u63a7\u5236\u53f0 \/ \u6587\u4ef6 \/ \u7f51\u7edc \/ \u7f13\u51b2<\/p>\n\n\u7ec4\u4ef6\u804c\u8d23\u7c7b\u6bd4<\/tr>\n\n\n\n\n\n\n\n\n
    Logger<\/td>\n\u5e94\u7528\u83b7\u53d6\u7684\u65e5\u5fd7\u5165\u53e3，\u6309\u540d\u79f0\u5f62\u6210\u5c42\u7ea7\u6811<\/td>\n\u6536\u4ef6\u4eba<\/td>\n<\/tr>\n
    Level<\/td>\n\u63a7\u5236\u65e5\u5fd7\u4e25\u91cd\u7a0b\u5ea6\u7684\u95e8\u69db<\/td>\n\u5b89\u68c0\u7b49\u7ea7<\/td>\n<\/tr>\n
    Filter<\/td>\n\u7ec6\u7c92\u5ea6\u7684\u53d1\u5e03\u5224\u65ad<\/td>\n\u5b89\u68c0\u5458<\/td>\n<\/tr>\n
    Handler<\/td>\n\u51b3\u5b9a\u65e5\u5fd7\u5199\u5230\u54ea\u91cc（\u63a7\u5236\u53f0\/\u6587\u4ef6\/\u7f51\u7edc）<\/td>\n\u6295\u9012\u6e20\u9053<\/td>\n<\/tr>\n
    Formatter<\/td>\n\u51b3\u5b9a\u65e5\u5fd7\u7684\u8f93\u51fa\u683c\u5f0f<\/td>\n\u5305\u88c5\u65b9\u5f0f<\/td>\n<\/tr>\n
    LogRecord<\/td>\n\u5728\u7ec4\u4ef6\u4e4b\u95f4\u4f20\u9012\u7684\u65e5\u5fd7\u4e8b\u4ef6\u6570\u636e<\/td>\n\u5305\u88f9<\/td>\n<\/tr>\n
    LogManager<\/td>\n\u5168\u5c40\u7ba1\u7406\u5668：Logger\u6ce8\u518c\u8868 + \u914d\u7f6e<\/td>\n\u90ae\u5c40\u603b\u5c40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \n

    3. Logger\u8be6\u89e3<\/h3>\n

    3.1 \u83b7\u53d6Logger\u4e0e\u5c42\u7ea7\u6811<\/h4>\n

    Logger \u901a\u8fc7 LogManager \u5168\u5c40\u6ce8\u518c\u8868\u6309\u540d\u79f0\u7f13\u5b58\u3002\u540d\u79f0\u91c7\u7528\u70b9\u5206\u5c42\u7ea7（\u4e0e\u5305\u540d\u65e0\u5173，\u53ea\u662f\u5b57\u7b26\u4e32\u524d\u7f00\u7ea6\u5b9a），\u5b50 Logger \u9ed8\u8ba4\u7ee7\u627f\u7236 Logger \u7684\u6709\u6548\u7ea7\u522b\u548c Handler \u4f20\u64ad\u3002<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> LoggerHierarchyDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n \/\/ \u63a8\u8350\u547d\u540d：\u7528\u7c7b\u7684\u5168\u9650\u5b9a\u540d，\u5929\u7136\u5f62\u6210\u5c42\u7ea7<\/span>
    \n Logger<\/span> daoLogger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.example.dao"<\/span>)<\/span>;<\/span>
    \n Logger<\/span> appLogger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.example"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u540c\u540dgetLogger\u8fd4\u56de\u540c\u4e00\u5b9e\u4f8b（\u6ce8\u518c\u8868\u7f13\u5b58）<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.example.dao"<\/span>)<\/span> ==<\/span> daoLogger)<\/span>;<\/span> \/\/ true<\/span><\/p>\n

    \/\/ \u5c42\u7ea7\u5173\u7cfb：com.example.dao \u7684\u7236\u662f com.example<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>daoLogger.<\/span>getParent<\/span>(<\/span>)<\/span>.<\/span>getName<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ com.example<\/span><\/p>\n

    \/\/ \u6839Logger\u540d\u4e3a ""，\u9ed8\u8ba4\u6302\u4e00\u4e2aINFO\u7ea7\u522b\u7684ConsoleHandler<\/span>
    \n Logger<\/span> root =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>""<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>root.<\/span>getHandlers<\/span>(<\/span>)<\/span>.<\/span>length)<\/span>;<\/span> \/\/ 1<\/span><\/p>\n

    \/\/ JDK7+ \u5168\u5c40Logger<\/span>
    \n Logger<\/span> global =<\/span> Logger<\/span>.<\/span>getGlobal<\/span>(<\/span>)<\/span>;<\/span>
    \n global.<\/span>info<\/span>(<\/span>"\u5168\u5c40\u65e5\u5fd7"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u5173\u952e\u9677\u9631：LogManager \u5bf9 Logger \u53ea\u6301\u6709\u5f31\u5f15\u7528\u3002\u5982\u679c\u5728\u65b9\u6cd5\u91cc Logger.getLogger(…) \u7528\u5b8c\u5c31\u4e22，\u8be5 Logger \u53ef\u80fd\u88ab GC \u56de\u6536，\u5176\u4e0a\u914d\u7f6e（Handler\u3001Level）\u968f\u4e4b\u4e22\u5931\u3002\u5fc5\u987b\u628a Logger \u5b58\u4e3a\u5b57\u6bb5\u3002<\/p>\n

    3.2 \u8bb0\u5f55\u65e5\u5fd7\u7684\u5b8c\u6574API<\/h4>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Level<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> LoggerApiDemo<\/span> {<\/span>
    \n private<\/span> static<\/span> final<\/span> Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.example.order"<\/span>)<\/span>;<\/span><\/p>\n

    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n \/\/ 1) \u4e03\u4e2a\u4fbf\u6377\u65b9\u6cd5（\u6309\u7ea7\u522b\u547d\u540d）<\/span>
    \n logger.<\/span>severe<\/span>(<\/span>"\u7cfb\u7edf\u5d29\u6e83"<\/span>)<\/span>;<\/span> \/\/ SEVERE 1000<\/span>
    \n logger.<\/span>warning<\/span>(<\/span>"\u78c1\u76d8\u7a7a\u95f4\u4e0d\u8db3"<\/span>)<\/span>;<\/span> \/\/ WARNING 900<\/span>
    \n logger.<\/span>info<\/span>(<\/span>"\u8ba2\u5355\u521b\u5efa\u6210\u529f"<\/span>)<\/span>;<\/span> \/\/ INFO 800<\/span>
    \n logger.<\/span>config<\/span>(<\/span>"\u7ebf\u7a0b\u6c60\u5927\u5c0f=8"<\/span>)<\/span>;<\/span> \/\/ CONFIG 700<\/span>
    \n logger.<\/span>fine<\/span>(<\/span>"\u7f13\u5b58\u547d\u4e2d key=1001"<\/span>)<\/span>;<\/span> \/\/ FINE 500<\/span>
    \n logger.<\/span>finer<\/span>(<\/span>"\u8fdb\u5165\u65b9\u6cd5 process"<\/span>)<\/span>;<\/span> \/\/ FINER 400<\/span>
    \n logger.<\/span>finest<\/span>(<\/span>"\u5faa\u73af\u7b2c3\u6b21\u8fed\u4ee3"<\/span>)<\/span>;<\/span> \/\/ FINEST 300<\/span><\/p>\n

    \/\/ 2) \u901a\u7528log\u65b9\u6cd5 + \u53c2\u6570\u5316\u6d88\u606f（{0}{1}\u5360\u4f4d\u7b26，MessageFormat\u8bed\u6cd5）<\/span>
    \n logger.<\/span>log<\/span>(<\/span>Level<\/span>.<\/span>INFO<\/span>,<\/span> "\u7528\u6237{0}\u4e0b\u5355，\u91d1\u989d{1}\u5143"<\/span>,<\/span> new<\/span> Object<\/span>[<\/span>]<\/span>{<\/span>"\u5f20\u4e09"<\/span>,<\/span> 199.5<\/span>}<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ 3) \u5e26\u5f02\u5e38\u5806\u6808<\/span>
    \n try<\/span> {<\/span>
    \n int<\/span> r =<\/span> 10<\/span> \/<\/span> 0<\/span>;<\/span>
    \n }<\/span> catch<\/span> (<\/span>ArithmeticException<\/span> e)<\/span> {<\/span>
    \n logger.<\/span>log<\/span>(<\/span>Level<\/span>.<\/span>SEVERE<\/span>,<\/span> "\u8ba1\u7b97\u5931\u8d25"<\/span>,<\/span> e)<\/span>;<\/span> \/\/ \u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3aThrowable，\u4f1a\u6253\u5370\u5806\u6808<\/span>
    \n }<\/span><\/p>\n

    \/\/ 4) \u65b9\u6cd5\u8fdb\u5165\/\u9000\u51fa\u8ffd\u8e2a（FINER\u7ea7\u522b，\u8c03\u8bd5\u8c03\u7528\u94fe\u5f88\u6709\u7528）<\/span>
    \n process<\/span>(<\/span>"\u53c2\u6570A"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ 5) \u5148\u5224\u65ad\u518d\u8bb0\u5f55（\u907f\u514d\u6602\u8d35\u7684\u53c2\u6570\u8ba1\u7b97）<\/span>
    \n if<\/span> (<\/span>logger.<\/span>isLoggable<\/span>(<\/span>Level<\/span>.<\/span>FINEST<\/span>)<\/span>)<\/span> {<\/span>
    \n logger.<\/span>finest<\/span>(<\/span>"\u5927\u5bf9\u8c61\u5feb\u7167: "<\/span> +<\/span> buildExpensiveSnapshot<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    private<\/span> static<\/span> void<\/span> process<\/span>(<\/span>String<\/span> arg)<\/span> {<\/span>
    \n logger.<\/span>entering<\/span>(<\/span>"LoggerApiDemo"<\/span>,<\/span> "process"<\/span>,<\/span> arg)<\/span>;<\/span> \/\/ FINER: ENTRY + \u53c2\u6570<\/span>
    \n try<\/span> {<\/span>
    \n \/\/ \u4e1a\u52a1\u903b\u8f91…<\/span>
    \n }<\/span> finally<\/span> {<\/span>
    \n logger.<\/span>exiting<\/span>(<\/span>"LoggerApiDemo"<\/span>,<\/span> "process"<\/span>)<\/span>;<\/span> \/\/ FINER: RETURN<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    private<\/span> static<\/span> String<\/span> buildExpensiveSnapshot<\/span>(<\/span>)<\/span> {<\/span>
    \n return<\/span> "\u8017\u65f6\u6784\u5efa\u7684\u5feb\u7167"<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    3.3 \u7ea7\u522b\u7ee7\u627f\u4e0eHandler\u4f20\u64ad<\/h4>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>ConsoleHandler<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Level<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> InheritanceDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n Logger<\/span> parent =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.demo"<\/span>)<\/span>;<\/span>
    \n Logger<\/span> child =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.demo.service"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ child\u672a\u8bbe\u7f6eLevel（null）\u2192 \u6709\u6548\u7ea7\u522b\u7ee7\u627f\u7236\u7ea7<\/span>
    \n parent.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>FINE<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>child.<\/span>isLoggable<\/span>(<\/span>new<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>LogRecord<\/span>(<\/span>Level<\/span>.<\/span>FINE<\/span>,<\/span> "x"<\/span>)<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span><\/p>\n

    \/\/ \u9ed8\u8ba4\u884c\u4e3a：\u65e5\u5fd7\u540c\u65f6\u4ea4\u7ed9\u81ea\u8eabHandler\u548c\u7236Handler（\u5411\u4e0a\u4f20\u64ad）<\/span>
    \n \/\/ \u82e5child\u4e5faddHandler，\u53ef\u80fd\u51fa\u73b0\u91cd\u590d\u8f93\u51fa！<\/span>
    \n child.<\/span>addHandler<\/span>(<\/span>new<\/span> ConsoleHandler<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n child.<\/span>info<\/span>(<\/span>"\u8fd9\u6761\u4f1a\u6253\u5370\u4e24\u6b21：child\u81ea\u5df1\u7684Handler + \u6839Logger\u7684\u9ed8\u8ba4Handler"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u89e3\u51b3：\u5173\u95ed\u5411\u7236\u7ea7\u4f20\u64ad<\/span>
    \n child.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n child.<\/span>info<\/span>(<\/span>"\u73b0\u5728\u53ea\u6253\u5370\u4e00\u6b21"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    4. Level\u65e5\u5fd7\u7ea7\u522b<\/h3>\n

    4.1 \u6807\u51c6\u7ea7\u522b\u4e00\u89c8<\/h4>\n

    JUL \u7684 Level \u662f\u6570\u503c，\u6570\u503c\u8d8a\u5927\u8d8a\u4e25\u91cd\u3002\u4ecb\u4e8e\u6807\u51c6\u7ea7\u522b\u4e4b\u95f4\u7684\u6570\u503c\u4e5f\u53ef\u81ea\u5b9a\u4e49\u3002<\/p>\n\nLevel\u6570\u503c\u8bed\u4e49\u2248SLF4J<\/tr>\n\n\n\n\n\n\n\n\n\n\n
    OFF<\/td>\nInteger.MAX_VALUE<\/td>\n\u5173\u95ed\u65e5\u5fd7<\/td>\n\u2014<\/td>\n<\/tr>\n
    SEVERE<\/td>\n1000<\/td>\n\u81f4\u547d\u9519\u8bef<\/td>\nERROR<\/td>\n<\/tr>\n
    WARNING<\/td>\n900<\/td>\n\u8b66\u544a<\/td>\nWARN<\/td>\n<\/tr>\n
    INFO<\/td>\n800<\/td>\n\u4e00\u822c\u4fe1\u606f<\/td>\nINFO<\/td>\n<\/tr>\n
    CONFIG<\/td>\n700<\/td>\n\u914d\u7f6e\u4fe1\u606f<\/td>\n\u2014（\u8fd1\u4f3cINFO）<\/td>\n<\/tr>\n
    FINE<\/td>\n500<\/td>\n\u8c03\u8bd5\u4fe1\u606f<\/td>\nDEBUG<\/td>\n<\/tr>\n
    FINER<\/td>\n400<\/td>\n\u8f83\u7ec6\u8c03\u8bd5（entering\/exiting\u7528）<\/td>\nTRACE<\/td>\n<\/tr>\n
    FINEST<\/td>\n300<\/td>\n\u6700\u7ec6\u7c92\u5ea6<\/td>\nTRACE<\/td>\n<\/tr>\n
    ALL<\/td>\nInteger.MIN_VALUE<\/td>\n\u5168\u90e8\u6253\u5f00<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    4.2 \u53cc\u91cd\u7ea7\u522b\u95e8\u69db<\/h4>\n

    \u4e00\u6761\u65e5\u5fd7\u8981\u6700\u7ec8\u8f93\u51fa，\u5fc5\u987b\u540c\u65f6\u901a\u8fc7 Logger \u7ea7\u522b\u548c Handler \u7ea7\u522b\u4e24\u9053\u95e8\u69db：<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>ConsoleHandler<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Level<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> LevelGateDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"gate.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span> \/\/ \u53bb\u6389\u9ed8\u8ba4Handler，\u907f\u514d\u5e72\u6270<\/span><\/p>\n

    ConsoleHandler<\/span> handler =<\/span> new<\/span> ConsoleHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>handler)<\/span>;<\/span><\/p>\n

    \/\/ \u573a\u666f1：Logger=FINE，Handler=INFO（\u9ed8\u8ba4） \u2192 FINE\u65e5\u5fd7\u4ecd\u7136\u770b\u4e0d\u5230！<\/span>
    \n logger.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>FINE<\/span>)<\/span>;<\/span>
    \n logger.<\/span>fine<\/span>(<\/span>"\u770b\u4e0d\u5230\u6211：\u88abHandler\u7684INFO\u7ea7\u522b\u6321\u4f4f"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u573a\u666f2：Handler\u4e5f\u653e\u5f00<\/span>
    \n handler.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n logger.<\/span>fine<\/span>(<\/span>"\u73b0\u5728\u80fd\u770b\u5230\u4e86：\u4e24\u9053\u95e8\u69db\u90fd\u901a\u8fc7"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    4.3 \u81ea\u5b9a\u4e49\u7ea7\u522b<\/h4>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Level<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    \/\/ \u81ea\u5b9a\u4e49\u7ea7\u522b：\u7ee7\u627fLevel，\u63d0\u4f9b name + value + resourceKey<\/span>
    \nclass<\/span> AuditLevel<\/span> extends<\/span> Level<\/span> {<\/span>
    \n \/\/ AUDENT\u5ba1\u8ba1\u7ea7\u522b：\u4ecb\u4e8eINFO(800)\u548cWARNING(900)\u4e4b\u95f4<\/span>
    \n public<\/span> static<\/span> final<\/span> AuditLevel<\/span> AUDIT<\/span> =<\/span> new<\/span> AuditLevel<\/span>(<\/span>"AUDIT"<\/span>,<\/span> 850<\/span>)<\/span>;<\/span><\/p>\n

    protected<\/span> AuditLevel<\/span>(<\/span>String<\/span> name,<\/span> int<\/span> value)<\/span> {<\/span>
    \n super<\/span>(<\/span>name,<\/span> value)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    public<\/span> class<\/span> CustomLevelDemo<\/span> {<\/span>
    \n private<\/span> static<\/span> final<\/span> Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"audit.demo"<\/span>)<\/span>;<\/span><\/p>\n

    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n java.<\/span>util.<\/span>logging.<\/span><\/span>ConsoleHandler<\/span> h =<\/span> new<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>ConsoleHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n h.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>h)<\/span>;<\/span>
    \n logger.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span><\/p>\n

    logger.<\/span>log<\/span>(<\/span>AuditLevel<\/span>.<\/span>AUDIT<\/span>,<\/span> "\u7ba1\u7406\u5458\u5220\u9664\u4e86\u7528\u62371001"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    5. Handler\u8f93\u51fa\u5904\u7406\u5668<\/h3>\n

    5.1 Handler\u7ee7\u627f\u4f53\u7cfb<\/h4>\n

    java.util.logging.Handler（\u62bd\u8c61）
    \n\u251c\u2500\u2500 StreamHandler \u2500\u2500 \u5199\u5165OutputStream（UTF-8，\u4e0d\u81ea\u52a8flush）
    \n\u2502 \u251c\u2500\u2500 ConsoleHandler \u2500\u2500 \u5199\u5165System.err，\u81ea\u52a8flush
    \n\u2502 \u251c\u2500\u2500 FileHandler \u2500\u2500 \u5199\u5165\u6587\u4ef6，\u652f\u6301\u6eda\u52a8
    \n\u2502 \u2514\u2500\u2500 SocketHandler \u2500\u2500 \u5199\u5165TCP\u5957\u63a5\u5b57，\u81ea\u52a8flush
    \n\u2514\u2500\u2500 MemoryHandler \u2500\u2500 \u5185\u5b58\u7f13\u51b2\u540e\u8f6c\u53d1\u7ed9\u76ee\u6807Handler<\/p>\n

    5.2 ConsoleHandler \u4e0e StreamHandler<\/h4>\n

    import<\/span> java.<\/span>io.<\/span><\/span>OutputStream<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> ConsoleHandlerDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"console.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ ConsoleHandler \u5199\u5165 System.err（\u7ea2\u8272\u8f93\u51fa，\u4e0e\u6b63\u5e38\u8f93\u51fa\u533a\u5206）<\/span>
    \n ConsoleHandler<\/span> console =<\/span> new<\/span> ConsoleHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n console.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>console)<\/span>;<\/span><\/p>\n

    \/\/ StreamHandler \u53ef\u5199\u4efb\u610fOutputStream（\u8fd9\u91cc\u5199System.out）<\/span>
    \n \/\/ \u6ce8\u610f：StreamHandler\u4e0d\u4f1a\u81ea\u52a8flush，\u4e00\u6761\u65e5\u5fd7\u53ef\u80fd\u6ede\u7559\u5728\u7f13\u51b2<\/span>
    \n StreamHandler<\/span> out =<\/span> new<\/span> StreamHandler<\/span>(<\/span>System<\/span>.<\/span>out,<\/span> new<\/span> SimpleFormatter<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n @Override<\/span>
    \n public<\/span> synchronized<\/span> void<\/span> publish<\/span>(<\/span>LogRecord<\/span> record)<\/span> {<\/span>
    \n super<\/span>.<\/span>publish<\/span>(<\/span>record)<\/span>;<\/span>
    \n flush<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u9010\u6761\u5237\u65b0，\u5426\u5219\u770b\u4e0d\u5230\u8f93\u51fa<\/span>
    \n }<\/span>
    \n }<\/span>;<\/span>
    \n out.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>out)<\/span>;<\/span><\/p>\n

    logger.<\/span>info<\/span>(<\/span>"\u540c\u65f6\u8f93\u51fa\u5230stderr\u548cstdout"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    5.3 FileHandler \u4e0e\u6eda\u52a8\u6587\u4ef6<\/h4>\n

    import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> FileHandlerDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> IOException<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"file.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u6eda\u52a8\u6587\u4ef6：%g\u662f\u5e8f\u53f7，\u6700\u591a5\u4e2a\u6587\u4ef6，\u6bcf\u4e2a\u4e0a\u965050KB<\/span>
    \n \/\/ \u5199\u6ee1\u540e app.log.0 \u2192 app.log.1，\u4f9d\u6b21\u8f6e\u8f6c<\/span>
    \n FileHandler<\/span> fh =<\/span> new<\/span> FileHandler<\/span>(<\/span>
    \n "logs\/app%g.log"<\/span>,<\/span> \/\/ \u8def\u5f84\u6a21\u5f0f<\/span>
    \n 50<\/span> *<\/span> 1024<\/span>,<\/span> \/\/ limit：\u5355\u6587\u4ef6\u5b57\u8282\u4e0a\u9650（0=\u4e0d\u9650）<\/span>
    \n 5<\/span>,<\/span> \/\/ count：\u6eda\u52a8\u6587\u4ef6\u6570<\/span>
    \n true<\/span>)<\/span>;<\/span> \/\/ append：\u662f\u5426\u8ffd\u52a0<\/span>
    \n fh.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n fh.<\/span>setFormatter<\/span>(<\/span>new<\/span> SimpleFormatter<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ FileHandler\u9ed8\u8ba4\u662fXMLFormatter<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>fh)<\/span>;<\/span><\/p>\n

    for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 100<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>
    \n logger.<\/span>info<\/span>(<\/span>"\u7b2c "<\/span> +<\/span> i +<\/span> " \u6761\u65e5\u5fd7"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n fh.<\/span>close<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u5fc5\u987bclose，\u5426\u5219\u53ef\u80fd\u4e22\u5931\u5c3e\u90e8\u6570\u636e<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u6a21\u5f0f\u5360\u4f4d\u7b26\u901f\u67e5：<\/p>\n\n\u5360\u4f4d\u7b26\u542b\u4e49\u793a\u4f8b<\/tr>\n\n\n\n\n\n\n
    %h<\/td>\n\u7528\u6237\u4e3b\u76ee\u5f55 user.home<\/td>\nC:\\\\Users\\\\dev<\/td>\n<\/tr>\n
    %t<\/td>\n\u7cfb\u7edf\u4e34\u65f6\u76ee\u5f55 java.io.tmpdir<\/td>\n\/tmp<\/td>\n<\/tr>\n
    %g<\/td>\n\u6eda\u52a8\u5e8f\u53f7<\/td>\napp0.log<\/td>\n<\/tr>\n
    %u<\/td>\n\u552f\u4e00\u6570（\u591a\u5b9e\u4f8b\u9632\u51b2\u7a81）<\/td>\napp1.log<\/td>\n<\/tr>\n
    %d<\/td>\n\u65e5\u671f<\/td>\napp2024-05-20.log<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    5.4 MemoryHandler（\u7f13\u51b2\u8f6c\u53d1）<\/h4>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> MemoryHandlerDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"memory.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u76ee\u6807：\u6587\u4ef6（\u6a21\u62df：\u8fd9\u91cc\u7528\u63a7\u5236\u53f0）<\/span>
    \n ConsoleHandler<\/span> target =<\/span> new<\/span> ConsoleHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n target.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ MemoryHandler：\u7f13\u51b2100\u6761；\u9047\u5230WARNING\u53ca\u4ee5\u4e0a\u7acb\u5373push；\u4e5f\u53ef\u624b\u52a8push<\/span>
    \n MemoryHandler<\/span> memory =<\/span> new<\/span> MemoryHandler<\/span>(<\/span>target,<\/span> 100<\/span>,<\/span> Level<\/span>.<\/span>WARNING<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>memory)<\/span>;<\/span>
    \n logger.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span><\/p>\n

    logger.<\/span>info<\/span>(<\/span>"\u5148\u7f13\u51b2，\u6682\u4e0d\u8f93\u51fa"<\/span>)<\/span>;<\/span> \/\/ \u8fdb\u7f13\u51b2\u533a<\/span>
    \n logger.<\/span>fine<\/span>(<\/span>"\u7ee7\u7eed\u7f13\u51b2"<\/span>)<\/span>;<\/span> \/\/ \u8fdb\u7f13\u51b2\u533a<\/span>
    \n logger.<\/span>warning<\/span>(<\/span>"\u89e6\u53d1push，\u524d\u9762\u7684\u5168\u90e8\u8f93\u51fa"<\/span>)<\/span>;<\/span> \/\/ \u2265WARNING \u2192 \u7f13\u51b2\u533a\u6574\u4f53\u63a8\u7ed9target<\/span><\/p>\n

    memory.<\/span>push<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u624b\u52a8\u5f3a\u5236\u8f93\u51fa\u5269\u4f59\u7f13\u51b2<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    6. Formatter\u683c\u5f0f\u5316\u5668<\/h3>\n

    6.1 SimpleFormatter \u4e0e\u683c\u5f0f\u5b9a\u5236<\/h4>\n

    SimpleFormatter \u8f93\u51fa\u6587\u672c\u683c\u5f0f\u3002\u9ed8\u8ba4\u8f93\u51fa\u8f83\u5570\u55e6，\u53ef\u901a\u8fc7\u7cfb\u7edf\u5c5e\u6027 -Djava.util.logging.SimpleFormatter.format \u5b9a\u5236：<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> SimpleFormatterDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n \/\/ \u4e5f\u53ef\u5728\u4ee3\u7801\u91cc\u8bbe\u7f6e（\u9700\u5728Logger\u4f7f\u7528\u524d）<\/span>
    \n System<\/span>.<\/span>setProperty<\/span>(<\/span>"java.util.logging.SimpleFormatter.format"<\/span>,<\/span>
    \n \/\/ %1$tF=\u65e5\u671f %1$tT=\u65f6\u95f4 %4$s=\u7ea7\u522b %3$s=Logger %5$s=\u6d88\u606f %6$s=\u5f02\u5e38<\/span>
    \n "%1$tF %1$tT [%4$s] %3$s – %5$s%6$s%n"<\/span>)<\/span>;<\/span><\/p>\n

    Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"format.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n ConsoleHandler<\/span> h =<\/span> new<\/span> ConsoleHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n h.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n h.<\/span>setFormatter<\/span>(<\/span>new<\/span> SimpleFormatter<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>h)<\/span>;<\/span><\/p>\n

    logger.<\/span>info<\/span>(<\/span>"\u5355\u884c\u8f93\u51fa，\u6e05\u723d\u591a\u4e86"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span>
    \n\/\/ \u8f93\u51fa：2024-05-20 10:30:15 [\u4fe1\u606f] format.demo – \u5355\u884c\u8f93\u51fa，\u6e05\u723d\u591a\u4e86<\/span><\/p>\n

    \u5360\u4f4d\u7b26\u8bf4\u660e（MessageFormat\u8bed\u6cd5）：<\/p>\n\n\u5360\u4f4d\u7b26\u5185\u5bb9<\/tr>\n\n\n\n\n\n\n\n
    %1$<\/td>\n\u65e5\u671f\u65f6\u95f4（LogRecord.millis）<\/td>\n<\/tr>\n
    %2$<\/td>\n\u6e90\u7c7b\u540d\u4e0e\u65b9\u6cd5\u540d<\/td>\n<\/tr>\n
    %3$<\/td>\nLogger\u540d\u79f0<\/td>\n<\/tr>\n
    %4$<\/td>\n\u7ea7\u522b（\u672c\u5730\u5316\u540d\u79f0）<\/td>\n<\/tr>\n
    %5$<\/td>\n\u6d88\u606f<\/td>\n<\/tr>\n
    %6$<\/td>\n\u5f02\u5e38\u5806\u6808<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    6.2 XMLFormatter<\/h4>\n

    FileHandler \u7684\u9ed8\u8ba4\u683c\u5f0f\u5316\u5668，\u8f93\u51fa\u7ed3\u6784\u5316 XML，\u9002\u5408\u673a\u5668\u89e3\u6790：<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> XmlFormatterDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> Exception<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"xml.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n FileHandler<\/span> fh =<\/span> new<\/span> FileHandler<\/span>(<\/span>"logs\/xml%u.log"<\/span>)<\/span>;<\/span>
    \n fh.<\/span>setFormatter<\/span>(<\/span>new<\/span> XMLFormatter<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u5176\u5b9e\u8fd9\u662f\u9ed8\u8ba4\u503c<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>fh)<\/span>;<\/span><\/p>\n

    logger.<\/span>info<\/span>(<\/span>"XML\u683c\u5f0f\u65e5\u5fd7"<\/span>)<\/span>;<\/span>
    \n fh.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span>
    \n\/*
    \n\u8f93\u51fa\u6587\u4ef6\u5185\u5bb9：
    \n<?xml version="1.0" encoding="UTF-8" standalone="no"?>
    \n<log>
    \n<record>
    \n <date>2024-05-20T10:30:15.123456789Z<\/date>
    \n <millis>1716198615123<\/millis>
    \n <sequence>0<\/sequence>
    \n <logger>xml.demo<\/logger>
    \n <level>INFO<\/level>
    \n <class>XmlFormatterDemo<\/class>
    \n <method>main<\/method>
    \n <thread>1<\/thread>
    \n <message>XML\u683c\u5f0f\u65e5\u5fd7<\/message>
    \n<\/record>
    \n<\/log>
    \n*\/<\/span><\/p>\n

    6.3 \u81ea\u5b9a\u4e49Formatter<\/h4>\n

    import<\/span> java.<\/span>time.<\/span><\/span>Instant<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>time.<\/span><\/span>ZoneId<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>time.<\/span>format.<\/span><\/span>DateTimeFormatter<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    \/\/ \u81ea\u5b9a\u4e49Formatter：\u53ea\u9700\u5b9e\u73b0 format(LogRecord)<\/span>
    \npublic<\/span> class<\/span> JsonFormatter<\/span> extends<\/span> Formatter<\/span> {<\/span>
    \n private<\/span> static<\/span> final<\/span> DateTimeFormatter<\/span> FMT<\/span> =<\/span>
    \n DateTimeFormatter<\/span>.<\/span>ofPattern<\/span>(<\/span>"yyyy-MM-dd HH:mm:ss.SSS"<\/span>)<\/span>
    \n .<\/span>withZone<\/span>(<\/span>ZoneId<\/span>.<\/span>systemDefault<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    @Override<\/span>
    \n public<\/span> String<\/span> format<\/span>(<\/span>LogRecord<\/span> record)<\/span> {<\/span>
    \n StringBuilder<\/span> sb =<\/span> new<\/span> StringBuilder<\/span>(<\/span>128<\/span>)<\/span>;<\/span>
    \n sb.<\/span>append<\/span>(<\/span>"{"<\/span>)<\/span>;<\/span>
    \n sb.<\/span>append<\/span>(<\/span>"\\\\"time\\\\":\\\\""<\/span>)<\/span>.<\/span>append<\/span>(<\/span>FMT<\/span>.<\/span>format<\/span>(<\/span>Instant<\/span>.<\/span>ofEpochMilli<\/span>(<\/span>record.<\/span>getMillis<\/span>(<\/span>)<\/span>)<\/span>)<\/span>)<\/span>.<\/span>append<\/span>(<\/span>"\\\\","<\/span>)<\/span>;<\/span>
    \n sb.<\/span>append<\/span>(<\/span>"\\\\"level\\\\":\\\\""<\/span>)<\/span>.<\/span>append<\/span>(<\/span>record.<\/span>getLevel<\/span>(<\/span>)<\/span>.<\/span>getName<\/span>(<\/span>)<\/span>)<\/span>.<\/span>append<\/span>(<\/span>"\\\\","<\/span>)<\/span>;<\/span>
    \n sb.<\/span>append<\/span>(<\/span>"\\\\"logger\\\\":\\\\""<\/span>)<\/span>.<\/span>append<\/span>(<\/span>record.<\/span>getLoggerName<\/span>(<\/span>)<\/span>)<\/span>.<\/span>append<\/span>(<\/span>"\\\\","<\/span>)<\/span>;<\/span>
    \n sb.<\/span>append<\/span>(<\/span>"\\\\"msg\\\\":\\\\""<\/span>)<\/span>.<\/span>append<\/span>(<\/span>escape<\/span>(<\/span>formatMessage<\/span>(<\/span>record)<\/span>)<\/span>)<\/span>.<\/span>append<\/span>(<\/span>"\\\\""<\/span>)<\/span>;<\/span>
    \n \/\/ \u6709\u5f02\u5e38\u65f6\u9644\u4e0a\u5806\u6808<\/span>
    \n if<\/span> (<\/span>record.<\/span>getThrown<\/span>(<\/span>)<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>
    \n java.<\/span>io.<\/span><\/span>StringWriter<\/span> sw =<\/span> new<\/span> java.<\/span>io.<\/span><\/span>StringWriter<\/span>(<\/span>)<\/span>;<\/span>
    \n record.<\/span>getThrown<\/span>(<\/span>)<\/span>.<\/span>printStackTrace<\/span>(<\/span>new<\/span> java.<\/span>io.<\/span><\/span>PrintWriter<\/span>(<\/span>sw)<\/span>)<\/span>;<\/span>
    \n sb.<\/span>append<\/span>(<\/span>",\\\\"exception\\\\":\\\\""<\/span>)<\/span>.<\/span>append<\/span>(<\/span>escape<\/span>(<\/span>sw.<\/span>toString<\/span>(<\/span>)<\/span>)<\/span>)<\/span>.<\/span>append<\/span>(<\/span>"\\\\""<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n sb.<\/span>append<\/span>(<\/span>"}\\\\n"<\/span>)<\/span>;<\/span>
    \n return<\/span> sb.<\/span>toString<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    \/\/ \u7b80\u5355\u8f6c\u4e49，\u9632\u6b62JSON\u7834\u574f<\/span>
    \n private<\/span> String<\/span> escape<\/span>(<\/span>String<\/span> s)<\/span> {<\/span>
    \n return<\/span> s.<\/span>replace<\/span>(<\/span>"\\\\\\\\"<\/span>,<\/span> "\\\\\\\\\\\\\\\\"<\/span>)<\/span>.<\/span>replace<\/span>(<\/span>"\\\\""<\/span>,<\/span> "\\\\\\\\\\\\""<\/span>)<\/span>
    \n .<\/span>replace<\/span>(<\/span>"\\\\n"<\/span>,<\/span> "\\\\\\\\n"<\/span>)<\/span>.<\/span>replace<\/span>(<\/span>"\\\\r"<\/span>,<\/span> "\\\\\\\\r"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    7. Filter\u8fc7\u6ee4\u5668<\/h3>\n

    JDK 8 \u8d77 Filter \u662f\u51fd\u6570\u5f0f\u63a5\u53e3，\u53ef\u76f4\u63a5\u7528 Lambda\u3002Logger \u548c Handler \u5404\u53ef\u6302\u4e00\u4e2a，\u4e24\u8005\u90fd\u901a\u8fc7\u624d\u53d1\u5e03\u3002<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> FilterDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"filter.demo"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n ConsoleHandler<\/span> h =<\/span> new<\/span> ConsoleHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n h.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>h)<\/span>;<\/span>
    \n logger.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>ALL<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ 1) Logger\u7ea7\u8fc7\u6ee4：\u5c4f\u853d\u5305\u542b"heartbeat"\u7684\u5608\u6742\u65e5\u5fd7<\/span>
    \n logger.<\/span>setFilter<\/span>(<\/span>record -><\/span>
    \n !<\/span>record.<\/span>getMessage<\/span>(<\/span>)<\/span>.<\/span>contains<\/span>(<\/span>"heartbeat"<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    logger.<\/span>info<\/span>(<\/span>"\u6b63\u5e38\u4e1a\u52a1\u65e5\u5fd7"<\/span>)<\/span>;<\/span> \/\/ \u8f93\u51fa<\/span>
    \n logger.<\/span>info<\/span>(<\/span>"heartbeat check ok"<\/span>)<\/span>;<\/span> \/\/ \u88ab\u8fc7\u6ee4<\/span><\/p>\n

    \/\/ 2) Handler\u7ea7\u8fc7\u6ee4：\u53ea\u8f93\u51faSEVERE<\/span>
    \n logger.<\/span>setFilter<\/span>(<\/span>null<\/span>)<\/span>;<\/span> \/\/ \u79fb\u9664Logger\u7ea7\u8fc7\u6ee4<\/span>
    \n h.<\/span>setFilter<\/span>(<\/span>record -><\/span> record.<\/span>getLevel<\/span>(<\/span>)<\/span>.<\/span>intValue<\/span>(<\/span>)<\/span> >=<\/span> Level<\/span>.<\/span>SEVERE<\/span>.<\/span>intValue<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n logger.<\/span>warning<\/span>(<\/span>"\u8b66\u544a\u4e0d\u8f93\u51fa"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>severe<\/span>(<\/span>"\u4e25\u91cd\u9519\u8bef\u624d\u8f93\u51fa"<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ 3) \u91c7\u6837\u8fc7\u6ee4：\u6bcf3\u6761\u8bb01\u6761（\u964d\u4f4e\u9ad8\u9891\u65e5\u5fd7\u91cf）<\/span>
    \n final<\/span> java.<\/span>util.<\/span>concurrent.<\/span>atomic.<\/span><\/span>AtomicInteger<\/span> counter =<\/span>
    \n new<\/span> java.<\/span>util.<\/span>concurrent.<\/span>atomic.<\/span><\/span>AtomicInteger<\/span>(<\/span>)<\/span>;<\/span>
    \n h.<\/span>setFilter<\/span>(<\/span>record -><\/span> counter.<\/span>incrementAndGet<\/span>(<\/span>)<\/span> %<\/span> 3<\/span> ==<\/span> 0<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    8. LogRecord\u4e0e\u65e5\u5fd7\u6d41\u8f6c<\/h3>\n

    LogRecord \u662f\u65e5\u5fd7\u4e8b\u4ef6\u7684\u8f7d\u4f53，\u5c01\u88c5\u4e86\u4e00\u6b21\u65e5\u5fd7\u8c03\u7528\u7684\u5168\u90e8\u4fe1\u606f：<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Level<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>LogRecord<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> LogRecordDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n LogRecord<\/span> record =<\/span> new<\/span> LogRecord<\/span>(<\/span>Level<\/span>.<\/span>INFO<\/span>,<\/span> "\u7528\u6237{0}\u767b\u5f55"<\/span>)<\/span>;<\/span>
    \n record.<\/span>setParameters<\/span>(<\/span>new<\/span> Object<\/span>[<\/span>]<\/span>{<\/span>"\u5f20\u4e09"<\/span>}<\/span>)<\/span>;<\/span> \/\/ {0}\u53c2\u6570<\/span><\/p>\n

    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u7ea7\u522b: "<\/span> +<\/span> record.<\/span>getLevel<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u6d88\u606f: "<\/span> +<\/span> record.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u53c2\u6570: "<\/span> +<\/span> java.<\/span>util.<\/span><\/span>Arrays<\/span>.<\/span>toString<\/span>(<\/span>record.<\/span>getParameters<\/span>(<\/span>)<\/span>)<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u65f6\u95f4: "<\/span> +<\/span> record.<\/span>getMillis<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u7ebf\u7a0b: "<\/span> +<\/span> record.<\/span>getThreadID<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u5e8f\u53f7: "<\/span> +<\/span> record.<\/span>getSequenceNumber<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u5168\u5c40\u9012\u589e<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u6e90\u7c7b: "<\/span> +<\/span> record.<\/span>getSourceClassName<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u6e90\u65b9\u6cd5: "<\/span> +<\/span> record.<\/span>getSourceMethodName<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u6ce8\u610f：Handler \u7684 publish(LogRecord) \u6536\u5230\u7684 record \u4e0e\u5176\u4ed6 Handler \u662f\u540c\u4e00\u5bf9\u8c61\u5f15\u7528\u3002\u5982\u679c\u81ea\u5b9a\u4e49 Handler \u4fee\u6539\u4e86 record（\u5982\u6539\u6d88\u606f），\u4f1a\u5f71\u54cd\u540e\u7eed Handler\u3002\u5f02\u6b65\u4f7f\u7528\u65f6\u66f4\u8981\u5c0f\u5fc3\u751f\u547d\u5468\u671f\u3002<\/p>\n

    \n

    9. LogManager\u4e0e\u914d\u7f6e\u6587\u4ef6<\/h3>\n

    9.1 \u914d\u7f6e\u52a0\u8f7d\u4f18\u5148\u7ea7<\/h4>\n

    \u2460 \u7cfb\u7edf\u5c5e\u6027 java.util.logging.config.class \u6307\u5b9a\u7684\u914d\u7f6e\u7c7b（\u6700\u9ad8\u4f18\u5148\u7ea7）
    \n\u2461 \u7cfb\u7edf\u5c5e\u6027 java.util.logging.config.file \u6307\u5b9a\u7684\u6587\u4ef6
    \n\u2462 $JAVA_HOME\/conf\/logging.properties（JDK9+；JDK8\u4e3a jre\/lib\/logging.properties）
    \n\u2463 \u90fd\u6ca1\u6709 \u2192 \u4f7f\u7528\u5185\u7f6e\u9ed8\u8ba4\u914d\u7f6e（\u6839Logger=INFO + ConsoleHandler）<\/p>\n

    \u542f\u52a8\u65b9\u5f0f：<\/p>\n

    # \u65b9\u5f0f1：\u5916\u90e8\u914d\u7f6e\u6587\u4ef6<\/span>
    \njava<\/span> -Djava.util.logging.config.file<\/span>=<\/span>my-logging.properties -jar<\/span> app.jar<\/p>\n

    # \u65b9\u5f0f2：\u5b9a\u5236SimpleFormatter\u683c\u5f0f<\/span>
    \njava<\/span> -Djava.util.logging.SimpleFormatter.format<\/span>=<\/span>"%1$tF<\/span> %1$tT<\/span> [%4$s<\/span>] %5$s<\/span>%6$s<\/span>%n"<\/span> -jar<\/span> app.jar<\/p>\n

    9.2 logging.properties \u5b8c\u6574\u793a\u4f8b<\/h4>\n

    # ============================================
    \n# logging.properties \u793a\u4f8b
    \n# ============================================<\/p>\n

    # \u6839Logger\u6302\u8f7d\u7684Handler\u5217\u8868（\u9017\u53f7\u5206\u9694）
    \nhandlers = java.util.logging.ConsoleHandler, java.util.logging.FileHandler<\/p>\n

    # \u6839Logger\u7ea7\u522b
    \n.level = INFO<\/p>\n

    # —- \u6309\u5305\u540d\/Logger\u540d\u8bbe\u7f6e\u7ea7\u522b（\u5b50\u7ea7\u7ee7\u627f） —-
    \ncom.example.level = FINE
    \ncom.example.dao.level = FINEST
    \norg.hibernate.level = WARNING<\/p>\n

    # —- ConsoleHandler \u914d\u7f6e —-
    \njava.util.logging.ConsoleHandler.level = ALL
    \njava.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter<\/p>\n

    # —- FileHandler \u914d\u7f6e —-
    \njava.util.logging.FileHandler.pattern = %h\/myapp%u.log
    \njava.util.logging.FileHandler.limit = 5000000
    \njava.util.logging.FileHandler.count = 10
    \njava.util.logging.FileHandler.append = true
    \njava.util.logging.FileHandler.formatter = java.util.logging.SimpleFormatter<\/p>\n

    # —- SimpleFormatter \u5355\u884c\u683c\u5f0f —-
    \njava.util.logging.SimpleFormatter.format = %1$tF %1$tT [%4$s] %3$s – %5$s%6$s%n<\/p>\n

    9.3 \u7f16\u7a0b\u5f0f\u914d\u7f6e<\/h4>\n

    import<\/span> java.<\/span>io.<\/span><\/span>ByteArrayInputStream<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>nio.<\/span>charset.<\/span><\/span>StandardCharsets<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>LogManager<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> ProgrammaticConfigDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> Exception<\/span> {<\/span>
    \n \/\/ \u7528\u4ee3\u7801\u65b9\u5f0f\u63d0\u4f9bproperties\u5185\u5bb9<\/span>
    \n String<\/span> config =<\/span> """
    \n handlers = java.util.logging.ConsoleHandler
    \n .level = INFO
    \n java.util.logging.ConsoleHandler.level = ALL
    \n java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
    \n com.example.level = FINE
    \n """<\/span>;<\/span>
    \n LogManager<\/span>.<\/span>getLogManager<\/span>(<\/span>)<\/span>.<\/span>readConfiguration<\/span>(<\/span>
    \n new<\/span> ByteArrayInputStream<\/span>(<\/span>config.<\/span>getBytes<\/span>(<\/span>StandardCharsets<\/span>.<\/span>UTF_8<\/span>)<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"com.example"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>fine<\/span>(<\/span>"FINE\u7ea7\u522b\u73b0\u5728\u53ef\u89c1\u4e86"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    10. \u81ea\u5b9a\u4e49Handler\u4e0eFormatter<\/h3>\n

    \u5c06\u65e5\u5fd7\u5199\u5165\u6570\u636e\u5e93\u7684\u5178\u578b\u573a\u666f：<\/p>\n

    import<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>*<\/span><\/span>;<\/span><\/p>\n

    \/**
    \n * \u81ea\u5b9a\u4e49Handler：\u5c06SEVERE\u7ea7\u65e5\u5fd7\u5199\u5165\u6570\u636e\u5e93（\u6b64\u5904\u7528\u5185\u5b58List\u6a21\u62df）
    \n *\/<\/span>
    \npublic<\/span> class<\/span> DatabaseHandler<\/span> extends<\/span> Handler<\/span> {<\/span>
    \n \/\/ \u5b9e\u9645\u9879\u76ee\u4e2d\u6ce8\u5165DataSource，\u8fd9\u91cc\u7528List\u6a21\u62df\u6570\u636e\u5e93\u8868<\/span>
    \n private<\/span> final<\/span> java.<\/span>util.<\/span><\/span>List<\/span><<\/span>String<\/span>><\/span><\/span> logTable =<\/span>
    \n java.<\/span>util.<\/span><\/span>Collections<\/span>.<\/span>synchronizedList<\/span>(<\/span>new<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    @Override<\/span>
    \n public<\/span> void<\/span> publish<\/span>(<\/span>LogRecord<\/span> record)<\/span> {<\/span>
    \n \/\/ 1) \u7ea7\u522b\u4e0e\u8fc7\u6ee4\u5224\u65ad（Handler\u57fa\u7c7b\u4e0d\u4f1a\u81ea\u52a8\u505a，\u9700\u624b\u52a8\u8c03\u7528）<\/span>
    \n if<\/span> (<\/span>!<\/span>isLoggable<\/span>(<\/span>record)<\/span>)<\/span> {<\/span>
    \n return<\/span>;<\/span>
    \n }<\/span>
    \n \/\/ 2) \u683c\u5f0f\u5316<\/span>
    \n String<\/span> message =<\/span> getFormatter<\/span>(<\/span>)<\/span> !=<\/span> null<\/span>
    \n ?<\/span> getFormatter<\/span>(<\/span>)<\/span>.<\/span>formatMessage<\/span>(<\/span>record)<\/span>
    \n :<\/span> record.<\/span>getMessage<\/span>(<\/span>)<\/span>;<\/span>
    \n \/\/ 3) \u5199\u5165\u76ee\u6807（\u6b64\u5904\u4e3aINSERT log_table VALUES(…)）<\/span>
    \n logTable.<\/span>add<\/span>(<\/span>record.<\/span>getLevel<\/span>(<\/span>)<\/span> +<\/span> " | "<\/span> +<\/span> message)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    @Override<\/span>
    \n public<\/span> void<\/span> flush<\/span>(<\/span>)<\/span> {<\/span> \/* \u6570\u636e\u5e93\u63d0\u4ea4 *\/<\/span> }<\/span><\/p>\n

    @Override<\/span>
    \n public<\/span> void<\/span> close<\/span>(<\/span>)<\/span> throws<\/span> SecurityException<\/span> {<\/span> \/* \u91ca\u653e\u8fde\u63a5 *\/<\/span> }<\/span><\/p>\n

    public<\/span> java.<\/span>util.<\/span><\/span>List<\/span><<\/span>String<\/span>><\/span><\/span> getLogTable<\/span>(<\/span>)<\/span> {<\/span> return<\/span> logTable;<\/span> }<\/span><\/p>\n

    \/\/ \u6f14\u793a<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"db.audit"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span>
    \n DatabaseHandler<\/span> dbHandler =<\/span> new<\/span> DatabaseHandler<\/span>(<\/span>)<\/span>;<\/span>
    \n dbHandler.<\/span>setLevel<\/span>(<\/span>Level<\/span>.<\/span>SEVERE<\/span>)<\/span>;<\/span> \/\/ \u53ea\u5165\u5e93\u4e25\u91cd\u9519\u8bef<\/span>
    \n dbHandler.<\/span>setFormatter<\/span>(<\/span>new<\/span> SimpleFormatter<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n logger.<\/span>addHandler<\/span>(<\/span>dbHandler)<\/span>;<\/span><\/p>\n

    logger.<\/span>warning<\/span>(<\/span>"\u8b66\u544a\u4e0d\u5165\u5e93"<\/span>)<\/span>;<\/span>
    \n logger.<\/span>severe<\/span>(<\/span>"\u652f\u4ed8\u5931\u8d25，\u9700\u8981\u4eba\u5de5\u4ecb\u5165"<\/span>)<\/span>;<\/span> \/\/ \u5165\u5e93<\/span><\/p>\n

    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u6570\u636e\u5e93\u4e2d\u7684\u65e5\u5fd7: "<\/span> +<\/span> dbHandler.<\/span>getLogTable<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \n

    11. \u4e0eSLF4J\u6865\u63a5<\/h3>\n

    11.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u6865\u63a5<\/h4>\n

    \u8bb8\u591a JDK \u5185\u90e8\u7ec4\u4ef6\u548c\u7b2c\u4e09\u65b9\u5e93（\u5982 HttpClient\u3001\u90e8\u5206\u65e7\u7248\u6846\u67b6）\u76f4\u63a5\u4f7f\u7528 JUL\u3002\u5982\u679c\u5e94\u7528\u4e3b\u65e5\u5fd7\u8d70 SLF4J + Logback，\u5c31\u9700\u8981\u628a JUL \u65e5\u5fd7\u7edf\u4e00\u6c47\u5165，\u5426\u5219\u65e5\u5fd7\u6563\u843d\u4e24\u5904\u3002<\/p>\n

    11.2 jul-to-slf4j \u6865\u63a5\u6b65\u9aa4<\/h4>\n

    <!– pom.xml：\u5f15\u5165SLF4J\u6865\u63a5\u5668 –><\/span>
    \n<<\/span>dependency<\/span>><\/span><\/span>
    \n <<\/span>groupId<\/span>><\/span><\/span>org.slf4j<\/<\/span>groupId<\/span>><\/span><\/span>
    \n <<\/span>artifactId<\/span>><\/span><\/span>jul-to-slf4j<\/<\/span>artifactId<\/span>><\/span><\/span>
    \n <<\/span>version<\/span>><\/span><\/span>2.0.13<\/<\/span>version<\/span>><\/span><\/span>
    \n<\/<\/span>dependency<\/span>><\/span><\/span>
    \n<<\/span>dependency<\/span>><\/span><\/span>
    \n <<\/span>groupId<\/span>><\/span><\/span>ch.qos.logback<\/<\/span>groupId<\/span>><\/span><\/span>
    \n <<\/span>artifactId<\/span>><\/span><\/span>logback-classic<\/<\/span>artifactId<\/span>><\/span><\/span>
    \n <<\/span>version<\/span>><\/span><\/span>1.4.14<\/<\/span>version<\/span>><\/span><\/span>
    \n<\/<\/span>dependency<\/span>><\/span><\/span><\/p>\n

    import<\/span> org.<\/span>slf4j.<\/span>bridge.<\/span><\/span>SLF4JBridgeHandler<\/span><\/span>;<\/span>
    \nimport<\/span> java.<\/span>util.<\/span>logging.<\/span><\/span>Logger<\/span><\/span>;<\/span><\/p>\n

    public<\/span> class<\/span> JulToSlf4jBridgeDemo<\/span> {<\/span>
    \n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
    \n \/\/ 1) \u79fb\u9664\u6839Logger\u9ed8\u8ba4\u7684ConsoleHandler（\u5426\u5219JUL\u65e5\u5fd7\u53cc\u4efd\u8f93\u51fa）<\/span>
    \n Logger<\/span> root =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>""<\/span>)<\/span>;<\/span>
    \n for<\/span> (<\/span>java.<\/span>util.<\/span>logging.<\/span><\/span>Handler<\/span> h :<\/span> root.<\/span>getHandlers<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
    \n root.<\/span>removeHandler<\/span>(<\/span>h)<\/span>;<\/span>
    \n }<\/span>
    \n \/\/ 2) \u5b89\u88c5\u6865\u63a5Handler：JUL\u65e5\u5fd7 \u2192 SLF4J \u2192 Logback<\/span>
    \n SLF4JBridgeHandler<\/span>.<\/span>install<\/span>(<\/span>)<\/span>;<\/span>
    \n \/\/ 3) \u653e\u5f00JUL\u7ea7\u522b，\u8ba9SLF4J\u7aef\u63a7\u5236\u8fc7\u6ee4<\/span>
    \n root.<\/span>setLevel<\/span>(<\/span>java.<\/span>util.<\/span>logging.<\/span><\/span>Level<\/span>.<\/span>FINEST<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u4e4b\u540e\u6240\u6709JUL\u65e5\u5fd7\u90fd\u8d70Logback\u7684\u683c\u5f0f\u4e0e\u8f93\u51fa\u76ee\u6807<\/span>
    \n Logger<\/span>.<\/span>getLogger<\/span>(<\/span>"legacy.lib"<\/span>)<\/span>.<\/span>info<\/span>(<\/span>"\u8fd9\u6761JUL\u65e5\u5fd7\u73b0\u5728\u7531Logback\u8f93\u51fa"<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u6027\u80fd\u6ce8\u610f：\u6865\u63a5\u901a\u8fc7\u53cd\u5c04\u4ece LogRecord \u63d0\u53d6\u8c03\u7528\u70b9\u4fe1\u606f，\u6709\u989d\u5916\u5f00\u9500\u3002SLF4J \u5b98\u65b9\u6587\u6863\u5efa\u8bae：\u5728\u6865\u63a5\u573a\u666f\u914d\u5408\u7ea7\u522b\u63a7\u5236（\u6839 Logger \u7ea7\u522b\u4e0d\u8981\u592a\u4f4e），\u53ef\u51cf\u5c11\u65e0\u6548\u8f6c\u53d1\u3002Logback \u4e5f\u63d0\u4f9b\u4e86 LevelChangePropagator \u6765\u628a Logback \u7684\u7ea7\u522b\u53d8\u66f4\u4f20\u64ad\u56de JUL，\u964d\u4f4e\u5f00\u9500\u3002<\/p>\n

    11.3 \u53cd\u5411：SLF4J \u2192 JUL？<\/h4>\n

    \u4e0d\u5e38\u89c1\u3002\u82e5\u6709\u5e93\u4f7f\u7528 SLF4J-api，\u800c\u4f60\u60f3\u7528 JUL \u8f93\u51fa，\u53ef\u5f15\u5165 slf4j-jdk14 \u7ed1\u5b9a（SLF4J 1.x \u98ce\u683c）\u3002\u73b0\u4ee3\u9879\u76ee\u4e00\u822c\u53cd\u8fc7\u6765\u7edf\u4e00\u3002<\/p>\n

    \n

    12. \u6700\u4f73\u5b9e\u8df5\u4e0e\u5e38\u89c1\u9677\u9631<\/h3>\n

    12.1 \u6700\u4f73\u5b9e\u8df5\u6e05\u5355<\/h4>\n

    \/\/ \u2705 1. Logger\u5b58\u4e3astatic final\u5b57\u6bb5（\u9632GC + \u590d\u7528）<\/span>
    \nprivate<\/span> static<\/span> final<\/span> Logger<\/span> logger =<\/span> Logger<\/span>.<\/span>getLogger<\/span>(<\/span>MyService<\/span>.<\/span>class<\/span>.<\/span>getName<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    \/\/ \u2705 2. \u7528\u53c2\u6570\u5316\u6d88\u606f\u4ee3\u66ff\u5b57\u7b26\u4e32\u62fc\u63a5（\u7ea7\u522b\u4e0d\u591f\u65f6\u4e0d\u683c\u5f0f\u5316）<\/span>
    \nlogger.<\/span>log<\/span>(<\/span>Level<\/span>.<\/span>INFO<\/span>,<\/span> "\u7528\u6237{0}\u6d88\u8d39{1}\u5143"<\/span>,<\/span> new<\/span> Object<\/span>[<\/span>]<\/span>{<\/span>user,<\/span> amount}<\/span>)<\/span>;<\/span>
    \n\/\/ \u274c logger.info("\u7528\u6237" + user + "\u6d88\u8d39" + amount + "\u5143");<\/span><\/p>\n

    \/\/ \u2705 3. \u6602\u8d35\u53c2\u6570\u5148\u505a\u7ea7\u522b\u5224\u65ad<\/span>
    \nif<\/span> (<\/span>logger.<\/span>isLoggable<\/span>(<\/span>Level<\/span>.<\/span>FINEST<\/span>)<\/span>)<\/span> {<\/span>
    \n logger.<\/span>finest<\/span>(<\/span>"\u5feb\u7167: "<\/span> +<\/span> expensiveToString<\/span>(<\/span>obj)<\/span>)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \/\/ \u2705 4. \u5f02\u5e38\u65e5\u5fd7\u5e26Throwable，\u4fdd\u7559\u5b8c\u6574\u5806\u6808<\/span>
    \nlogger.<\/span>log<\/span>(<\/span>Level<\/span>.<\/span>SEVERE<\/span>,<\/span> "\u4fdd\u5b58\u8ba2\u5355\u5931\u8d25, orderId="<\/span> +<\/span> id,<\/span> exception)<\/span>;<\/span><\/p>\n

    \/\/ \u2705 5. \u5173\u95ed\u5411\u7236Handler\u4f20\u64ad，\u907f\u514d\u91cd\u590d\u8f93\u51fa<\/span>
    \nchildLogger.<\/span>setUseParentHandlers<\/span>(<\/span>false<\/span>)<\/span>;<\/span><\/p>\n

    12.2 \u5e38\u89c1\u9677\u9631<\/h4>\n\n\u9677\u9631\u73b0\u8c61\u89e3\u51b3<\/tr>\n\n\n\n\n\n\n\n\n
    Logger\u672a\u5b58\u5b57\u6bb5<\/td>\n\u65e5\u5fd7"\u968f\u673a\u6d88\u5931"，\u88abGC\u56de\u6536<\/td>\n\u5b58\u4e3a static final \u5b57\u6bb5<\/td>\n<\/tr>\n
    Handler\u7ea7\u522b\u672a\u653e\u5f00<\/td>\nlogger.fine() \u65e0\u8f93\u51fa<\/td>\nhandler.setLevel(Level.ALL)<\/td>\n<\/tr>\n
    \u5fd8\u8bb0\u5173\u4f20\u64ad<\/td>\n\u540c\u4e00\u6761\u65e5\u5fd7\u6253\u5370\u591a\u6b21<\/td>\nsetUseParentHandlers(false)<\/td>\n<\/tr>\n
    FileHandler\u672aclose<\/td>\n\u65e5\u5fd7\u6587\u4ef6\u7f3a\u5c3e\u90e8\/\u9501\u6587\u4ef6\u6b8b\u7559<\/td>\ntry-with-resources \u6216\u663e\u5f0fclose<\/td>\n<\/tr>\n
    \u8f93\u51fa\u5230err\u56f0\u60d1<\/td>\nConsoleHandler\u5199System.err<\/td>\n\u4e86\u89e3\u5373\u53ef，\u6216\u6362\u81ea\u5b9a\u4e49StreamHandler<\/td>\n<\/tr>\n
    \u5360\u4f4d\u7b26\u8bed\u6cd5\u9519<\/td>\n{0} \u4e0d\u751f\u6548<\/td>\nJUL\u7528MessageFormat\u8bed\u6cd5，\u975eSLF4J\u7684{}<\/td>\n<\/tr>\n
    \u9ed8\u8ba4\u914d\u7f6e\u8986\u76d6<\/td>\n\u81ea\u5b9a\u4e49\u914d\u7f6e\u4e0d\u751f\u6548<\/td>\n\u68c0\u67e5\u52a0\u8f7d\u4f18\u5148\u7ea7，\u7528-Djava.util.logging.config.file<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    12.3 \u4ec0\u4e48\u573a\u666f\u9002\u5408JUL<\/h4>\n
      \n
    • \u8f7b\u91cf\u5de5\u5177\/\u811a\u672c：\u4e0d\u60f3\u5f15\u5165\u7b2c\u4e09\u65b9\u4f9d\u8d56<\/li>\n
    • \u5e93\u5f00\u53d1：JDK \u5185\u7f6e，\u4e0d\u7ed9\u4f7f\u7528\u65b9\u5f3a\u52a0\u65e5\u5fd7\u5b9e\u73b0（\u4f46\u66f4\u63a8\u8350 SLF4J-api）<\/li>\n
    • \u53d7\u7ba1\u63a7\u73af\u5883：\u53ea\u5141\u8bb8 JDK \u6807\u51c6\u5e93<\/li>\n
    • \u5e94\u7528\u4e3b\u65e5\u5fd7：\u4e0d\u63a8\u8350，\u5efa\u8bae SLF4J + Logback\/Log4j2<\/li>\n<\/ul>\n
      \n

      13. \u7248\u672c\u6f14\u8fdb<\/h3>\n\n\u7248\u672c\u5e74\u4efd\u53d8\u5316<\/tr>\n\n\n\n\n\n\n\n\n
      JDK 1.4<\/td>\n2002<\/td>\n\u9996\u6b21\u5f15\u5165 java.util.logging \u5168\u5957API（JSR 47）：Logger\u3001Handler\u3001Formatter\u3001Level\u3001Filter\u3001LogManager\u3001LogRecord<\/td>\n<\/tr>\n
      JDK 5<\/td>\n2004<\/td>\nLogger.getAnonymousLogger() \u7b49\u5c0f\u5e45\u5b8c\u5584<\/td>\n<\/tr>\n
      JDK 7<\/td>\n2011<\/td>\nLogger.getGlobal()；SimpleFormatter.format \u7cfb\u7edf\u5c5e\u6027\u652f\u6301\u81ea\u5b9a\u4e49\u683c\u5f0f<\/td>\n<\/tr>\n
      JDK 8<\/td>\n2014<\/td>\nFilter \u6210\u4e3a\u51fd\u6570\u5f0f\u63a5\u53e3，\u652f\u6301 Lambda<\/td>\n<\/tr>\n
      JDK 9<\/td>\n2017<\/td>\n\u6a21\u5757\u5316：\u5f52\u5165 java.logging \u6a21\u5757；\u9ed8\u8ba4\u914d\u7f6e\u6587\u4ef6\u8def\u5f84\u53d8\u4e3a $JAVA_HOME\/conf\/logging.properties；\u5f15\u5165 PlatformLogger（JDK\u5185\u90e8\u65e5\u5fd7）<\/td>\n<\/tr>\n
      JDK 10<\/td>\n2018<\/td>\nPlatformLogger.LoggerFinder SPI：\u53ef\u66ff\u6362 JDK \u5185\u90e8\u65e5\u5fd7\u540e\u7aef（\u5982\u628aJDK\u5185\u90e8\u65e5\u5fd7\u5bfc\u5411\u81ea\u5b9a\u4e49\u5b9e\u73b0）<\/td>\n<\/tr>\n
      JDK 21<\/td>\n2023<\/td>\nAPI \u4fdd\u6301\u7a33\u5b9a，\u65e0\u91cd\u5927\u53d8\u66f4；\u4e0e\u865a\u62df\u7ebf\u7a0b\u7b49\u5e76\u53d1\u7279\u6027\u81ea\u7136\u517c\u5bb9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u603b\u7ed3：JUL \u81ea 1.4 \u5f15\u5165\u540e API \u9ad8\u5ea6\u7a33\u5b9a，\u6f14\u8fdb\u4ee5\u5c0f\u5e45\u589e\u5f3a\u4e3a\u4e3b\u3002\u5b83\u7684\u4ef7\u503c\u5728\u4e8e"\u6c38\u8fdc\u5b58\u5728\u3001\u96f6\u4f9d\u8d56"；\u4f01\u4e1a\u7ea7\u5e94\u7528\u901a\u5e38\u901a\u8fc7\u6865\u63a5\u5c06\u5176\u7eb3\u5165 SLF4J \u7edf\u4e00\u4f53\u7cfb\u3002<\/p>\n

      \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

      Java\u65e5\u5fd7API（JUL）\u8be6\u89e3 \u76ee\u5f55
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      \n1.1 \u4ec0\u4e48\u662fJUL
      \nJUL（Java Util Logging）\u662f Java \u6807\u51c6\u5e93\u81ea<\/p>\n","protected":false},"author":2,"featured_media":99863,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-99864","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-java","tag-190"],"yoast_head":"\nJava\u6df1\u5165\u89e3\u6790\u7bc7\u5341\u4e09\u4e4bJava\u65e5\u5fd7API\uff08JUL\uff09\u8be6\u89e3 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/99864.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u6df1\u5165\u89e3\u6790\u7bc7\u5341\u4e09\u4e4bJava\u65e5\u5fd7API\uff08JUL\uff09\u8be6\u89e3 - 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