{"id":49454,"date":"2025-07-30T18:17:29","date_gmt":"2025-07-30T10:17:29","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/49454.html"},"modified":"2025-07-30T18:17:29","modified_gmt":"2025-07-30T10:17:29","slug":"java%e4%bb%8e%e5%85%a5%e9%97%a8%e5%88%b0%e7%b2%be%e9%80%9a%ef%bc%81%e7%ac%ac%e5%8d%81%e5%85%ab%e5%a4%a9jdk17%e5%ae%89%e8%a3%85%e4%bb%a5%e5%8f%8a%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-%e5%ae%8c","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/49454.html","title":{"rendered":"Java\u4ece\u5165\u95e8\u5230\u7cbe\u901a\uff01\u7b2c\u5341\u516b\u5929(JDK17\u5b89\u88c5\u4ee5\u53ca\u7f51\u7edc\u7f16\u7a0b) \u5b8c\u7ed3\u7bc7\uff01\uff01\uff01"},"content":{"rendered":"<\/p>\n

\u4e09\u3001\u7f51\u7edc\u7f16\u7a0b<\/h4>\n

1．\u7f51\u7edc\u7f16\u7a0b\u6982\u8ff0<\/p>\n

Java \u662f Internet \u4e0a\u7684\u8bed\u8a00，\u5b83\u4ece\u8bed\u8a00\u7ea7\u4e0a\u63d0\u4f9b\u4e86\u5bf9\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u7684\u652f\u6301，\u7a0b\u5e8f\u5458\u80fd\u591f\u5f88\u5bb9\u6613\u5f00\u53d1\u5e38\u89c1\u7684\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n

2．\u7f51\u7edc\u7684\u57fa\u7840<\/p>\n

（1）\u8ba1\u7b97\u673a\u7f51\u7edc<\/p>\n

\u628a\u5206\u5e03\u5728\u4e0d\u540c\u5730\u7406\u533a\u57df\u7684\u8ba1\u7b97\u673a\u4e0e\u4e13\u95e8\u7684\u5916\u90e8\u8bbe\u5907\u7528\u901a\u8baf\u7ebf\u8def\u4e92\u8054\u6210\u4e00\u4e2a\u89c4\u6a21\u5927，\u529f\u80fd\u5f3a\u7684\u7f51\u7edc\u7cfb\u7edf，\u4ece\u800c\u4f7f\u4f17\u591a\u7684\u8ba1\u7b97\u673a\u53ef\u4ee5\u65b9\u4fbf\u5730\u4e92\u4f20\u4fe1\u606f，\u5171\u4eab\u786c\u4ef6，\u8f6f\u4ef6，\u6570\u636e\u4fe1\u606f\u7b49\u8d44\u6e90\u3002<\/p>\n

（2）\u7f51\u7edc\u7f16\u7a0b\u7684\u76ee\u7684<\/p>\n

\u76f4\u63a5\u6216\u95f4\u63a5\u7684\u901a\u8fc7\u7f51\u7edc\u534f\u8bae\u4e0e\u5176\u4ed6\u8ba1\u7b97\u673a\u5b9e\u73b0\u6570\u636e\u4e92\u6362，\u8fdb\u884c\u901a\u8baf\u3002<\/p>\n

3．\u7f51\u7edc\u901a\u8baf\u7684\u8981\u7d20\u6982\u8ff0<\/p>\n

（1）\u901a\u8baf\u53cc\u65b9\u7684\u5730\u5740：IP \u5730\u5740，\u7aef\u53e3\u53f7<\/p>\n

（2）\u4e00\u5b9a\u7684\u89c4\u5219，\u5373\u7f51\u7edc\u901a\u8baf\u7684\u534f\u8bae，\u6709\u4e24\u5957\u53c2\u8003\u6a21\u578b：<\/p>\n

\u2460 OSI \u53c2\u8003\u6a21\u578b：\u6a21\u578b\u8fc7\u4e8e\u7406\u60f3\u5316，\u672a\u80fd\u5728\u56e0\u7279\u7f51\u4e0a\u8fdb\u884c\u5e7f\u6cdb\u63a8\u5e7f<\/p>\n

\u2461 TCP\/IP \u53c2\u8003\u6a21\u578b（TCP\/IP\u534f\u8bae）：\u4e8b\u5b9e\u4e0a\u7684\u56fd\u9645\u6807\u51c6<\/p>\n

\"\"<\/p>\n

（3）\u7f51\u7edc\u901a\u8baf\u8981\u7d201：IP \u5730\u5740\u548c\u7aef\u53e3\u53f7<\/p>\n

1）IP \u5730\u5740：InetAddress<\/p>\n

a. \u552f\u4e00\u7684\u6807\u8bc6 Internet \u4e0a\u7684\u8ba1\u7b97\u673a（\u901a\u8baf\u5b9e\u4f53）<\/p>\n

b. \u672c\u5730\u73af\u56de\u5730\u5740（127.0.0.1）：127.0.0.1\/localhost<\/p>\n

c. IP\u5730\u5740\u7684\u5206\u7c7b\u65b9\u5f0f1：IPV4 \u548c IPV6<\/p>\n

a) IPV4：4 \u4e2a\u5b57\u8282\u7ec4\u6210，4 \u4e2a 0~255，\u5927\u6982 42 \u4ebf，30 \u4ebf\u90fd\u5728\u5317\u7f8e，\u4e9a\u6d32 4 \u4ebf，2011 \u5e74\u521d\u5df2\u7ecf\u7528\u5b8c，\u4ee5\u70b9\u5206\u5341\u8fdb\u5236\u8868\u793a，\u6bd4\u5982：192.16.0.211<\/p>\n

b) IPV6: 128\u4f4d（16\u4e2a\u5b57\u8282），\u5199\u6210 8 \u4e2a\u65e0\u7b26\u53f7\u6574\u6570，\u6bcf\u4e2a\u6574\u6570\u7528\u56db\u4e2a\u5341\u516d\u8fdb\u5236\u4f4d\u8868\u793a，\u6570\u4e4b\u95f4\u7528\u5192\u53f7（：）\u5206\u5f00，\u4f8b\u5982：3ffe:3201:1401:1280:c8ff:fe4d:db39:984<\/p>\n

d. IP \u5730\u5740\u5206\u7c7b\u65b9\u5f0f 2：\u516c\u7f51\u5730\u5740（\u4e07\u7ef4\u7f51\u4f7f\u7528）\u548c\u79c1\u6709\u5730\u5740（\u5c40\u57df\u7f51\u4f7f\u7528）\u3002\u5176\u4e2d 192.168. \u5f00\u5934\u7684\u5c31\u662f\u79c1\u6709\u5730\u5740，\u8303\u56f4\u662f 192.168.0.0~192.168.255.255，\u4e13\u95e8\u4e3a\u7ec4\u7ec7\u673a\u6784\u5185\u90e8\u4f7f\u7528\u3002<\/p>\n

2）\u7aef\u53e3\u53f7\u6807\u8bc6\u6b63\u5728\u8ba1\u7b97\u673a\u4e0a\u8fd0\u884c\u7684\u8fdb\u7a0b（\u7a0b\u5e8f）<\/p>\n

a. \u4e0d\u540c\u7684\u8fdb\u7a0b\u6709\u4e0d\u540c\u7684\u7aef\u53e3\u53f7，\u8fd9\u6837\u540c\u4e00\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u540c\u65f6\u5141\u8bb8\u591a\u4e2a\u8fdb\u7a0b\u8fdb\u884c\u901a\u8baf\u3002<\/p>\n

b. \u88ab\u89c4\u5b9a\u4e3a\u4e00\u4e2a 16 \u4f4d\u7684\u6574\u6570：0~65535<\/p>\n

c. \u7aef\u53e3\u7684\u5206\u7c7b<\/p>\n

a) \u516c\u8ba4\u7aef\u53e3：0~1023，\u88ab\u9884\u5148\u5b9a\u4e49\u7684\u670d\u52a1\u901a\u8baf\u5360\u7528（\u5982：HTTP \u5360\u7528\u7aef\u53e3\u53f7 80，FTP \u5360\u7528 21 \u7aef\u53e3，Telnet \u5360\u752823\u7aef\u53e3），\u7a0b\u5e8f\u5458\u4e0d\u80fd\u53bb\u5360\u7528\u8fd9\u4e9b\u7aef\u53e3，<\/p>\n

b) \u6ce8\u518c\u7aef\u53e3：1024~49151，\u5206\u914d\u7ed9\u7528\u6237\u8fdb\u7a0b\u6216\u5e94\u7528\u7a0b\u5e8f（\u5982 Tomcat \u5360\u7528\u7aef\u53e3 8080，MySQL \u5360\u7528\u7aef\u53e33306，Oracle \u5360\u7528\u7aef\u53e3 1521）<\/p>\n

c) \u52a8\u6001\/\u79c1\u6709\u7aef\u53e3：49152~65535<\/p>\n

d. \u7aef\u53e3\u53f7\u548c IP \u5730\u5740\u7ec4\u5408\u5f97\u5230\u4e00\u4e2a\u7f51\u7edc\u5957\u63a5\u5b57：Socket<\/p>\n

\"\"<\/p>\n

3）InetAddress \u7c7b：Java \u4e2d\u8868\u793a IP \u5730\u5740\u7684\u7c7b<\/p>\n

a. Internet \u4e0a\u7684\u4e3b\u673a\u53c8\u6709\u4e24\u79cd\u8868\u793a\u65b9\u5f0f：<\/p>\n

a) \u57df\u540d（hostName）：www.baidu.com，\u6bcf\u4e2a\u57df\u540d\u90fd\u5bf9\u5e94\u4e86\u4e00\u4e2a\u6216\u591a\u4e2aIP\u5730\u5740，\u901a\u8fc7\u57df\u540d\u670d\u52a1\u5668（DNS）\u5c06\u57df\u540d\u89e3\u6790\u6210 IP \u5730\u5740\u7684\u5f62\u6210\u6765\u901a\u8baf，\u57df\u540d\u6bd4 IP \u5730\u5740\u66f4\u5bb9\u6613\u8bb0\u5fc6\u3002<\/p>\n

b) IP \u5730\u5740（hostAddress）：39.156.66.14<\/p>\n

b. InetAddress \u7c7b\u4e3b\u8981\u8868\u793a IP \u5730\u5740，\u6709\u4e24\u4e2a\u5b50\u7c7b：Inet4Address，Inet6Address\u3002<\/p>\n

c. InetAddress \u7c7b\u5bf9\u8c61\u5305\u542b\u6709\u4e00\u4e2a Internet \u4e3b\u673a\u5730\u5740\u7684\u57df\u540d\u6216IP\u5730\u5740：www.baidu.com\u621639.156.66.14<\/p>\n

d. \u57df\u540d\u5bb9\u6613\u8bb0\u5fc6，\u5f53\u5728\u8fde\u63a5\u7f51\u7edc\u65f6\u8f93\u5165\u4e00\u4e2a\u4e3b\u673a\u7684\u57df\u540d\u540e，\u57df\u540d\u670d\u52a1\u5668（DNS）\u8d1f\u8d23\u5c06\u57df\u540d\u8f6c\u6362\u4e3aIP\u5730\u5740，\u8fd9\u6837\u624d\u80fd\u548c\u4e3b\u673a\u5efa\u7acb\u8fde\u63a5\u3002—-\u57df\u540d\u89e3\u6790<\/p>\n

\"\"<\/p>\n

e. InetAddress \u7c7b\u6ca1\u6709\u63d0\u4f9b\u516c\u5171\u7684\u6784\u9020\u5668，\u800c\u662f\u63d0\u4f9b\u4e86\u5982\u4e0b\u51e0\u4e2a\u9759\u6001\u65b9\u6cd5\u6765\u83b7\u53d6 InetAddress：<\/p>\n

public static InetAddress getLocalHost(); \/\/\u83b7\u53d6\u672c\u673a\u5bf9\u5e94\u7684 InetAddress<\/p>\n

public static InetAddress getByName(String host); \/\/\u901a\u8fc7\u4e3b\u673a\u540d（\u57df\u540d）\u6216IP\u5730\u5740\u83b7\u53d6InetAddress<\/p>\n

f. InetAddress \u5e38\u7528\u7684\u65b9\u6cd5<\/p>\n

public String getHostAddress()：\u8fd4\u56de IP \u5730\u5740\u5b57\u7b26\u4e32（\u4ee5\u6587\u672c\u8868\u73b0\u5f62\u5f0f）<\/p>\n

public String getHostName()：\u83b7\u53d6\u6b64 IP \u5730\u5740\u7684\u4e3b\u673a\u540d<\/p>\n

public boolean isReachable(int timeout)：\u6d4b\u8bd5\u662f\u5426\u53ef\u4ee5\u8fbe\u5230\u8be5\u5730\u5740<\/p>\n

\u793a\u4f8b：<\/p>\n

\"\"<\/p>\n

（4）\u7f51\u7edc\u901a\u8baf\u7684\u8981\u7d202：\u7f51\u7edc\u534f\u8bae<\/p>\n

1）\u7f51\u7edc\u901a\u8baf\u534f\u8bae<\/p>\n

\u8ba1\u7b97\u673a\u7f51\u7edc\u4e2d\u5b9e\u73b0\u901a\u8baf\u5fc5\u987b\u8981\u6709\u4e00\u4e9b\u7ea6\u5b9a，\u5373\u901a\u4fe1\u534f\u8bae，\u5bf9\u901f\u7387，\u4f20\u8f93\u4ee3\u7801，\u4ee3\u7801\u7ed3\u6784，\u4f20\u8f93\u63a7\u5236\u6b65\u9aa4，\u51fa\u9519\u63a7\u5236\u7b49\u6307\u5b9a\u6807\u51c6\u3002<\/p>\n

2）\u95ee\u9898：\u7f51\u7edc\u534f\u8bae\u592a\u590d\u6742<\/p>\n

\u8ba1\u7b97\u673a\u7f51\u7edc\u901a\u8baf\u6d89\u53ca\u5185\u90e8\u6bd4\u8f83\u591a，\u6bd4\u5982\u6307\u5b9a\u6e90\u5730\u5740\u548c\u76ee\u7684\u5730\u5730\u5740，\u52a0\u5bc6\u89e3\u5bc6，\u538b\u7f29\u89e3\u538b\u7f29，\u5dee\u9519\u63a7\u5236，\u8def\u7531\u63a7\u5236，\u5982\u4f55\u5b9e\u73b0\u5982\u6b64\u590d\u6742\u7684\u7f51\u7edc\u534f\u8bae\u5462<\/p>\n

3）\u901a\u4fe1\u534f\u8bae\u5206\u5c42\u7684\u601d\u60f3<\/p>\n

\u5728\u6307\u5b9a\u534f\u8bae\u65f6，\u628a\u590d\u6742\u6210\u5206\u5206\u89e3\u6210\u4e00\u4e9b\u7b80\u5355\u7684\u6210\u5206，\u518d\u5c06\u5b83\u4eec\u590d\u5408\u8d77\u6765，\u6700\u5e38\u7528\u7684\u590d\u5408\u65b9\u5f0f\u5c31\u662f\u5c42\u6b21\u65b9\u5f0f，\u5373\u540c\u5c42\u95f4\u53ef\u4ee5\u901a\u8baf，\u4e0a\u4e00\u5c42\u53ef\u4ee5\u8c03\u7528\u4e0b\u4e00\u5c42，\u800c\u4e0e\u518d\u4e00\u5c42\u4e0d\u53d1\u751f\u5173\u7cfb，\u5404\u5c42\u4e92\u4e0d\u5f71\u54cd，\u5229\u4e8e\u7cfb\u7edf\u7684\u5f00\u53d1\u548c\u6269\u5c55\u3002<\/p>\n

4）TCP\/IP \u534f\u8bae\u7c07<\/p>\n

a. \u4f20\u8f93\u5c42\u534f\u8bae\u4e2d\u6709\u4e24\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u534f\u8bae：<\/p>\n

\u4f20\u8f93\u5c42\u63a7\u5236\u534f\u8bae TCP（Transmission Control Protocol）<\/p>\n

\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae UDP（User Datagram Protocol）<\/p>\n

b. TCP\/IP \u4ee5\u5176\u4e24\u4e2a\u4e3b\u8981\u534f\u8bae：\u4f20\u8f93\u5c42\u63a7\u5236\u534f\u8bae（TCP）\u548c\u7f51\u7edc\u4e92\u8054\u534f\u8bae（IP）\u800c\u5f97\u540d，\u5b9e\u9645\u4e0a\u662f\u4e00\u7ec4\u534f\u8bae，\u5305\u62ec\u591a\u4e2a\u5177\u6709\u4e0d\u540c\u529f\u80fd\u4e14\u4e92\u4e3a\u5173\u8054\u7684\u534f\u8bae<\/p>\n

c. IP（Internet Protocol）\u534f\u8bae\u662f\u7f51\u7edc\u5c42\u7684\u4e3b\u8981\u534f\u8bae，\u652f\u6301\u7f51\u95f4\u4e92\u8054\u7684\u6570\u636e\u901a\u8baf\u3002<\/p>\n

d. TCP\/IP \u534f\u8bae\u6a21\u578b\u4ece\u66f4\u5b9e\u7528\u7684\u89d2\u5ea6\u51fa\u53d1，\u5f62\u6210\u4e86\u9ad8\u6548\u7684\u56db\u5c42\u4f53\u7cfb\u7ed3\u6784，\u5373\u7269\u7406\u94fe\u8def\u5c42，IP\u5c42，\u4f20\u8f93\u5c42，\u5e94\u7528\u5c42\u3002<\/p>\n

5）TCP \u548c UDP<\/p>\n

a. TCP \u534f\u8bae：<\/p>\n

\u4f7f\u7528 TCP \u534f\u8bae\u524d，\u9700\u8981\u5efa\u7acb TCP \u8fde\u63a5，\u5f62\u6210\u4f20\u8f93\u6570\u636e\u901a\u9053，<\/p>\n

\u4f20\u8f93\u524d，\u91c7\u7528\u201c\u4e09\u6b21\u63e1\u624b\u201d\u65b9\u5f0f，\u70b9\u5bf9\u70b9\u901a\u4fe1，\u662f\u53ef\u9760\u7684\u901a\u4fe1<\/p>\n

TCP \u534f\u8bae\u8fdb\u884c\u901a\u4fe1\u7684\u4e24\u4e2a\u5e94\u7528\u7a0b\u5e8f：\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668<\/p>\n

\u5728\u8fde\u63a5\u4e2d\u53ef\u8fdb\u884c\u5927\u6570\u636e\u91cf\u7684\u4f20\u8f93<\/p>\n

\u4f20\u8f93\u5b8c\u6bd5，\u9700\u8981\u91ca\u653e\u5df2\u5efa\u7acb\u7684\u8fde\u63a5，\u6548\u7387\u4f4e\u3002<\/p>\n

b. UDP \u534f\u8bae<\/p>\n

\u5c06\u6570\u636e，\u6e90\u5730\u5740，\u76ee\u7684\u5730\u5c01\u88c5\u6210\u6570\u636e\u62a5，\u4e0d\u9700\u8981\u5efa\u7acb\u8fde\u63a5<\/p>\n

\u6bcf\u4e2a\u6570\u636e\u62a5\u7684\u5927\u5c0f\u9650\u5236\u5728 64K \u5185<\/p>\n

\u53d1\u9001\u4e0d\u7ba1\u5bf9\u65b9\u662f\u5426\u51c6\u5907\u597d，\u63a5\u6536\u65b9\u6536\u5230\u4e5f\u4e0d\u786e\u8ba4，\u6240\u4ee5\u662f\u4e0d\u53ef\u9760<\/p>\n

\u53ef\u4ee5\u5e7f\u64ad\u53d1\u9001<\/p>\n

\u53d1\u9001\u6570\u636e\u7ed3\u675f\u65f6\u65e0\u9700\u91ca\u653e\u8d44\u6e90，\u5f00\u9500\u5c0f，\u901f\u5ea6\u5feb\u3002<\/p>\n

（5）Socket \u7f16\u7a0b<\/p>\n

1）\u5229\u7528\u5957\u63a5\u5b57（Socket）\u5f00\u53d1\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u5df2\u88ab\u5e7f\u6cdb\u4f7f\u7528，\u4ee5\u81f3\u4e8e\u6210\u4e3a\u4e86\u4e8b\u5b9e\u4e0a\u7684\u6807\u51c6<\/p>\n

2）\u7f51\u7edc\u4e0a\u5177\u6709\u552f\u4e00\u6807\u8bc6\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u7ec4\u5408\u5728\u4e00\u8d77\u624d\u80fd\u6784\u6210\u552f\u4e00\u80fd\u8bc6\u522b\u7684\u6807\u8bc6\u7b26\u5957\u63a5\u5b57<\/p>\n

3）\u901a\u4fe1\u4e24\u7aef\u90fd\u8981\u6709 Socket，\u662f\u4e24\u53f0\u673a\u5668\u901a\u4fe1\u7684\u7aef\u70b9\u3002<\/p>\n

4）\u7f51\u7edc\u901a\u4fe1\u5176\u5b9e\u5c31\u662f Socket \u901a\u8baf<\/p>\n

5）Socket \u5141\u8bb8\u7a0b\u5e8f\u628a\u7f51\u7edc\u8fde\u63a5\u5f53\u6210\u4e00\u4e2a\u6d41，\u6570\u636e\u5728\u4e24\u4e2a Socket \u95f4\u901a\u8fc7 IO \u4f20\u8f93<\/p>\n

6）\u4e00\u822c\u4e3b\u52a8\u53d1\u9001\u901a\u4fe1\u7684\u5e94\u7528\u7a0b\u5e8f\u662f\u5ba2\u6237\u7aef，\u7b49\u5f85\u901a\u4fe1\u8bf7\u6c42\u7684\u662f\u670d\u52a1\u7aef\u3002<\/p>\n

7）Socket \u5206\u7c7b<\/p>\n

a. \u6d41\u5957\u63a5\u5b57（Stream Socket）：\u4f7f\u7528 TCP \u63d0\u4f9b\u7684\u5b57\u8282\u6d41\u670d\u52a1<\/p>\n

b. \u6570\u636e\u62a5\u5957\u63a5\u5b57（Datagram Socket）：\u4f7f\u7528 UDP \u63d0\u4f9b\u201c\u5c3d\u529b\u800c\u4e3a\u201d\u7684\u6570\u636e\u62a5\u670d\u52a1<\/p>\n

8）Socket \u7c7b\u7684\u5e38\u7528\u6784\u9020\u5668：<\/p>\n

public Socket(InetAddress address,int port)：\u521b\u5efa\u4e00\u4e2a\u6d41\u5957\u63a5\u5b57（TCP）\u5e76\u5c06\u5176\u8fde\u63a5\u5230\u6307\u5b9aIP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u3002<\/p>\n

public Socket(String host,int port)：\u521b\u5efa\u4e00\u4e2a\u6d41\u5957\u63a5\u5b57\u5e76\u5c06\u5176\u8fde\u63a5\u5230\u6307\u5b9a\u4e3b\u673a\u4e0a\u7684\u6307\u5b9a\u7aef\u53e3\u3002<\/p>\n

9）Socket\u7c7b\u7684\u5e38\u7528\u65b9\u6cd5：<\/p>\n

public InputStream getInputStream()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u5165\u6d41\u3002\u53ef\u4ee5\u7528\u4e8e\u63a5\u6536\u7f51\u7edc\u6d88\u606f\u3002<\/p>\n

public OutputStream getOutputStream()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u51fa\u6d41\u3002\u53ef\u4ee5\u7528\u4e8e\u53d1\u9001\u7f51\u7edc\u6d88\u606f<\/p>\n

public InetAddress getInetAddress()：\u6b64\u5957\u63a5\u5b57\u8fde\u63a5\u5230\u7684\u8fdc\u7a0bIP\u5730\u5740；\u5982\u679c\u5957\u63a5\u5b57\u662f\u672a\u8fde\u63a5\u7684，\u5219\u8fd4\u56denull\u3002<\/p>\n

public InetAddress getLocalAddress()：\u83b7\u53d6\u5957\u63a5\u5b57\u7ed1\u5b9a\u7684\u672c\u5730\u5730\u5740\u3002\u5373\u672c\u5730\u7684IP\u5730\u5740<\/p>\n

public int getPort()：\u6b64\u5957\u63a5\u5b57\u8fde\u63a5\u5230\u7684\u8fdc\u7a0b\u7aef\u53e3\u53f7；\u5982\u679c\u5957\u63a5\u5b57\u5c1a\u672a\u8fde\u63a5，\u8fd4\u56de0<\/p>\n

public int getLocalPort()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7ed1\u5b9a\u5230\u7684\u672c\u5730\u7aef\u53e3\u3002\u5982\u679c\u5c1a\u672a\u7ed1\u5b9a\u5957\u63a5\u5b57，\u5219\u8fd4\u56de-1.<\/p>\n

public void close()：\u5173\u95ed\u6b64\u5957\u63a5\u5b57\u3002\u5957\u63a5\u5b57\u88ab\u5173\u95ed\u540e，\u4fbf\u4e0d\u53ef\u5728\u4ee5\u540e\u7684\u7f51\u7edc\u4e2d\u4f7f\u7528（\u5373\u65e0\u6cd5\u91cd\u65b0\u8fde\u63a5\u6216\u91cd\u65b0\u7ed1\u5b9a）\u3002\u9700\u8981\u521b\u5efa\u65b0\u7684\u5957\u63a5\u5b57\u5bf9\u8c61\u3002\u5173\u95ed\u6b64\u5957\u63a5\u5b57\u4e5f\u5c06\u4f1a\u5173\u95ed\u8be5\u5957\u63a5\u5b57\u7684 InputStream \u548c OutputStream<\/p>\n

public void shutdownInput()：\u5982\u679c\u5728\u6b64\u5957\u63a5\u5b57\u4e0a\u8c03\u7528\u8be5\u65b9\u6cd5\u540e\u4ece\u5957\u63a5\u5b57\u8f93\u5165\u6d41\u8bfb\u53d6\u5185\u5bb9，\u5219\u6d41\u5c06\u8fd4\u56de EOF（\u6587\u4ef6\u7ed3\u675f\u7b26）\u3002\u5373\u4e0d\u80fd\u4ece\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u5165\u6d41\u4e2d\u63a5\u6536\u4efb\u4f55\u6570\u636e\u3002<\/p>\n

public void shutdownOutput()：\u7981\u7528\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u51fa\u6d41\u3002\u5373\u4e0d\u80fd\u901a\u8fc7\u6b64\u5957\u63a5\u5b57\u7684\u8f93\u51fa\u6d41\u53d1\u9001\u4efb\u4f55\u6570\u636e\u3002<\/p>\n

（6）TCP \u7f51\u7edc\u7f16\u7a0b：\u57fa\u4e8e Socket \u7684 TCP \u7f16\u7a0b<\/p>\n

\"\"<\/p>\n

\u793a\u4f8b：\u5b9e\u73b0\u670d\u52a1\u5668\u7aef\u53ef\u4ee5\u540c\u65f6\u63a5\u6536\u591a\u4e2a\u5ba2\u6237\u7aef\u4e0a\u4f20\u6587\u4ef6<\/p>\n

\u670d\u52a1\u7aef：<\/p>\n

package com.edu.net;<\/p>\n

import java.io.BufferedInputStream;
\nimport java.io.BufferedOutputStream;
\nimport java.io.FileOutputStream;
\nimport java.io.IOException;
\nimport java.io.InputStream;
\nimport java.io.OutputStream;
\nimport java.net.InetAddress;
\nimport java.net.ServerSocket;
\nimport java.net.Socket;
\nimport java.util.concurrent.ExecutorService;
\nimport java.util.concurrent.Executors;<\/p>\n

\/\/\u6587\u4ef6\u4e0a\u4f20\u591a\u7ebf\u7a0b\u670d\u52a1\u7aef
\npublic class TCPServer {<\/p>\n

\u00a0\u00a0 \u00a0public static void main(String[] args) throws Exception{
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated method stub
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/1. \u521b\u5efa\u4e00\u4e2a\u5e26\u7f13\u51b2\u7684\u7ebf\u7a0b\u6c60
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0ExecutorService threadPool = Executors.newCachedThreadPool();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/2. \u521b\u5efa\u670d\u52a1\u7aef\u7684 Socket，\u76d1\u542c\u7aef\u53e3，\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0a\u6765
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0ServerSocket serverSocket = new ServerSocket(6666);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u5b9e\u73b0\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u670d\u52a1\u5668\u7684\u64cd\u4f5c
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0while(true) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/3. \u6ce8\u610f：\u6b64\u65f6\u8fd4\u56de\u7684 socket \u5c31\u662f\u6307\u5f53\u524d\u8fde\u63a5\u4e0a\u6765\u7684\u5ba2\u6237\u7aef Socket
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0Socket socket = serverSocket.accept();\/\/\u8be5\u65b9\u6cd5\u4f1a\u963b\u585e，\u76f4\u5230\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0a\u6765\u4e3a\u6b62
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/4. \u4e00\u65e6\u6709\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0a\u6765，\u6211\u4eec\u5c31\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6765\u5904\u7406\u8be5\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0Runnable r = () -> {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0try {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ 5. \u663e\u793a\u4e00\u4e0b\u5f53\u524d\u662f\u54ea\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u4e0a\u6765\u4e86
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0InetAddress ipAddr = socket.getInetAddress();\/\/\u5f97\u5230\u5ba2\u6237\u7aef\u7684 IP \u5730\u5740
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0String ip = ipAddr.getHostAddress();\/\/\u83b7\u53d6 IP \u5730\u5740\u5b57\u7b26\u4e32
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.out.println("\u5ba2\u6237\u7aef：" + ip + "，\u8fde\u63a5\u5230\u670d\u52a1\u5668…");
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/6. \u83b7\u5f97 socket \u7684\u8f93\u5165\u6d41
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0InputStream in = socket.getInputStream();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0BufferedInputStream bis = new BufferedInputStream(in);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ 7. \u521b\u5efa\u8f93\u51fa\u6d41，\u6307\u5b9a\u4e0a\u4f20\u6587\u4ef6\u7684\u76ee\u5f55，\u6bd4\u5982\u6211\u4eec\u9700\u8981\u5728 F \u76d8\u4e2d\u521b\u5efa\u4e00\u4e2a upload \u76ee\u5f55
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("f:\/upload\/" + ip + "(" +\u00a0
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.currentTimeMillis() + ").jpg"));
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0byte[] buf = new byte[1024];
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0int len = -1;
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0while((len = bis.read(buf)) != -1) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u5199\u5165\u6587\u4ef6
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0bos.write(buf, 0, len);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/8. \u5b8c\u6210\u4e4b\u540e\u8f93\u51fa\u4e00\u4e9b\u4fe1\u606f\u7ed9\u5ba2\u6237\u7aef
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0OutputStream out = socket.getOutputStream();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0out.write("\u56fe\u7247\u4e0a\u4f20\u6210\u529f".getBytes());
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/9. \u5173\u95ed\u8d44\u6e90
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0out.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0bos.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0bis.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (IOException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0};
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u5c06\u4e0a\u9762\u7684\u4efb\u52a1\u653e\u5230\u7ebf\u7a0b\u6c60\u4e2d\u6267\u884c
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0threadPool.execute(r);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0}<\/p>\n

}<\/p>\n

\u5ba2\u6237\u7aef：<\/p>\n

package com.edu.net;<\/p>\n

import java.io.BufferedInputStream;
\nimport java.io.FileInputStream;
\nimport java.io.IOException;
\nimport java.io.InputStream;
\nimport java.io.OutputStream;
\nimport java.net.Socket;
\nimport java.net.UnknownHostException;<\/p>\n

public class TCPClient {<\/p>\n

\u00a0\u00a0 \u00a0public static void main(String[] args) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated method stub
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0try {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/1. \u521b\u5efa\u5ba2\u6237\u7aef Socket，\u6307\u5b9a\u670d\u52a1\u5668\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u53bb\u8fde\u63a5\u670d\u52a1\u5668
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0Socket socket = new Socket("192.168.110.56", 6666);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/2. \u83b7\u53d6 Socket \u8f93\u51fa\u6d41，\u628a\u56fe\u7247\u6587\u4ef6\u5199\u7ed9\u670d\u52a1\u5668
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0OutputStream out = socket.getOutputStream();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/3. \u521b\u5efa\u8f93\u5165\u6d41，\u8bfb\u53d6\u672c\u5730\u56fe\u7247\u6587\u4ef6
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0BufferedInputStream bis = new BufferedInputStream(new FileInputStream("d:\/img.jpg"));
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/4. \u5199\u51fa\u56fe\u7247\u6570\u636e\u7ed9\u670d\u52a1\u5668
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0byte[] buf = new byte[1024];
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0int len = -1;
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0while((len = bis.read(buf)) != -1) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0out.write(buf, 0, len);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/5. \u5199\u5b8c\u4e4b\u540e，\u5173\u95ed\u8f93\u51fa\u6d41
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.shutdownOutput();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/6. \u8bfb\u53d6\u670d\u52a1\u5668\u53cd\u9988\u7684\u4fe1\u606f
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0InputStream in = socket.getInputStream();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0byte[] buffer = new byte[1024];
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0int length = in.read(buffer);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.out.println(new String(buffer, 0, length));
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/7. \u5173\u95ed\u8d44\u6e90
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0in.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0bis.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0out.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (UnknownHostException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (IOException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0}<\/p>\n

}<\/p>\n

\"\"<\/p>\n

（7）UDP\u7f51\u7edc\u7f16\u7a0b：UDP\u7f51\u7edc\u901a\u8baf<\/p>\n

1）\u7c7b DatagramSocket \u548c DatagramPacket \u5b9e\u73b0\u4e86\u57fa\u4e8e UDP \u534f\u8bae\u7684\u7f51\u7edc\u7a0b\u5e8f<\/p>\n

2）UDP \u6570\u636e\u62a5\u901a\u8fc7\u6570\u636e\u62a5\u5957\u63a5\u5b57 DatagramSocket \u53d1\u9001\u548c\u63a5\u6536，\u7cfb\u7edf\u4e0d\u4fdd\u8bc1 UDP \u6570\u636e\u62a5\u80fd\u591f\u5b89\u5168\u7684\u5230\u8fbe\u76ee\u7684\u5730，\u4e5f\u4e0d\u80fd\u786e\u5b9a\u4ec0\u4e48\u65f6\u5019\u80fd\u5230\u8fbe\u3002<\/p>\n

3）DatagramPacket \u5bf9\u8c61\u5c01\u88c5\u4e86 UDP \u6570\u636e\u62a5，\u5728\u6570\u636e\u62a5\u4e2d\u5305\u542b\u4e86\u53d1\u9001\u7aef IP \u5730\u5740\u548c\u7aef\u53e3\u53f7\u4ee5\u53ca\u63a5\u6536\u7aef\u7684 IP \u5730\u5740\u548c\u7aef\u53e3\u3002<\/p>\n

4）UDP \u534f\u8bae\u4e2d\u6bcf\u4e2a\u6570\u636e\u62a5\u90fd\u7ed9\u51fa\u5b8c\u6574\u7684\u5730\u5740\u4fe1\u606f，\u56e0\u6b64\u65e0\u9700\u5efa\u7acb\u53d1\u9001\u65b9\u548c\u63a5\u6536\u65b9\u7684\u8fde\u63a5，\u7c7b\u4f3c\u4e0e\u53d1\u5feb\u9012\u5305\u88f9\u4e00\u6837\u3002<\/p>\n

5）DatagramSocket \u7c7b\u7684\u5e38\u7528\u65b9\u6cd5<\/p>\n

public DatagramSocket(int port)：\u521b\u5efa\u6570\u636e\u62a5\u5957\u63a5\u5b57\u5e76\u5c06\u5176\u7ed1\u5b9a\u5728\u672c\u673a\u6307\u5b9a\u7aef\u53e3\u3002\u5957\u63a5\u5b57\u5c06\u88ab\u7ed1\u5b9a\u5230\u901a\u914d\u7b26\u5730\u5740，IP \u5730\u5740\u7531\u5185\u6838\u6765\u9009\u62e9\u3002<\/p>\n

public DatagramSocket(int port, InetAddress Iaddr)：\u521b\u5efa\u6570\u636e\u62a5\u5957\u63a5\u5b57，\u5c06\u5176\u7ed1\u5b9a\u5230\u6307\u5b9a\u672c\u5730\u5730\u5740，\u672c\u5730\u7aef\u53e3\u5fc5\u987b\u57280\u523065535\u4e4b\u95f4，\u5982\u679c IP \u5730\u5740\u662f 0.0.0.0，\u5957\u63a5\u5b57\u5c06\u88ab\u7ed1\u5b9a\u5230\u901a\u914d\u7b26\u5730\u5740，IP \u5730\u5740\u7531\u5185\u6838\u9009\u62e9\u3002<\/p>\n

public void close(): \u5173\u95ed\u6b64\u6570\u636e\u62a5\u5957\u63a5\u5b57\u3002<\/p>\n

public void send(DatagramPacket p) : \u4ece\u6b64\u5957\u63a5\u5b57\u53d1\u9001\u6570\u636e\u62a5\u62a5\u3002DatagramPacket \u5305\u542b\u7684\u4fe1\u606f\u6307\u793a：\u5c06\u8981\u53d1\u9001\u7684\u6570\u636e\u3001\u5176\u957f\u5ea6\u3001\u8fdc\u7a0b\u4e3b\u673a\u7684IP\u5730\u5740\u548c\u8fdc\u7a0b\u4e3b\u673a\u7684\u7aef\u53e3\u53f7\u3002<\/p>\n

public void receive(DatagramPacket p)：\u4ece\u6b64\u5957\u63a5\u5b57\u63a5\u6536\u6570\u636e\u62a5\u62a5\u3002\u5f53\u6b64\u65b9\u6cd5\u8fd4\u56de\u65f6，DatagramPacket \u7684\u7f13\u51b2\u533a\u586b\u5145\u4e86\u63a5\u6536\u7684\u6570\u636e\u3002\u6570\u636e\u62a5\u62a5\u4e5f\u5305\u542b\u53d1\u9001\u65b9\u7684IP\u5730\u5740\u548c\u7aef\u53e3\u53f7\u3002\u6b64\u65b9\u6cd5\u5728\u63a5\u6536\u5230\u6570\u636e\u62a5\u524d\u4e00\u76f4\u963b\u585e\u3002\u6570\u636e\u62a5\u5305\u5bf9\u8c61\u7684 length \u5b57\u6bb5\u5305\u542b\u6240\u63a5\u6536\u4fe1\u606f\u7684\u957f\u5ea6\u3002\u5982\u679c\u4fe1\u606f\u6bd4\u62a5\u7684\u957f\u5ea6\u957f，\u8be5\u4fe1\u606f\u5c06\u88ab\u622a\u65ad\u3002<\/p>\n

public InetAddress getLocalAddress()：\u83b7\u53d6\u5957\u63a5\u5b57\u7ed1\u5b9a\u7684\u672c\u5730\u5730\u5740\u3002<\/p>\n

public int getLocalPort()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7ed1\u5b9a\u7684\u672c\u5730\u4e3b\u673a\u4e0a\u7684\u7aef\u53e3\u53f7\u3002<\/p>\n

public InetAddress getInetAddress()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u8fde\u63a5\u7684\u5730\u5740\u3002\u5982\u679c\u5957\u63a5\u5b57\u672a\u8fde\u63a5，\u5219\u8fd4\u56denull\u3002<\/p>\n

public int getPort()：\u8fd4\u56de\u6b64\u5957\u63a5\u5b57\u7684\u7aef\u53e3\u3002\u5982\u679c\u5957\u63a5\u5b57\u672a\u8fde\u63a5，\u5219\u8fd4\u56de-1.<\/p>\n

public DatagramPacket(byte[] buf,int length)：\u6784\u9020 DatagramPacket，\u7528\u6765\u63a5\u6536\u957f\u5ea6\u4e3a length \u7684\u6570\u636e\u5305\u3002length \u53c2\u6570\u5fc5\u987b\u5c0f\u4e8e\u7b49\u4e8ebuf.length\u3002<\/p>\n

public DatagramPacket(byte[] buf,int length,InetAddress address,int port)：\u6784\u9020\u6570\u636e\u62a5\u62a5，\u7528\u6765\u5c06\u957f\u5ea6\u4e3alength \u7684\u5305\u53d1\u9001\u5230\u6307\u5b9a\u4e3b\u673a\u4e0a\u7684\u6307\u5b9a\u7aef\u53e3\u53f7\u3002length \u53c2\u6570\u5fc5\u987b\u5c0f\u4e8e\u7b49\u4e8e buf.length\u3002<\/p>\n

public InetAddress getAddress()：\u8fd4\u56de\u67d0\u53f0\u673a\u5668\u7684IP\u5730\u5740，\u6b64\u6570\u636e\u62a5\u5c06\u8981\u53d1\u5f80\u8be5\u673a\u5668\u6216\u8005\u662f\u4ece\u8be5\u673a\u5668\u63a5\u6536\u5230\u7684\u3002<\/p>\n

public int getPort()：\u8fd4\u56de\u67d0\u53f0\u8fdc\u7a0b\u4e3b\u673a\u7684\u7aef\u53e3\u53f7，\u6b64\u6570\u636e\u62a5\u5c06\u8981\u53d1\u5f80\u8be5\u4e3b\u673a\u6216\u8005\u662f\u4ece\u8be5\u4e3b\u673a\u63a5\u6536\u5230\u7684\u3002<\/p>\n

public byte[] getData()：\u8fd4\u56de\u6570\u636e\u7f13\u51b2\u533a\u3002\u63a5\u6536\u5230\u7684\u6216\u5c06\u8981\u53d1\u9001\u7684\u6570\u636e\u4ece\u7f13\u51b2\u533a\u7684\u504f\u79fb\u91cf offset \u5904\u5f00\u59cb，\u6301\u7eedlength \u957f\u5ea6\u3002<\/p>\n

public int getLength()：\u8fd4\u56de\u5c06\u8981\u53d1\u9001\u6216\u63a5\u6536\u5230\u7684\u6570\u636e\u7684\u957f\u5ea6\u3002<\/p>\n

6）\u6d41\u7a0b：<\/p>\n

a. \u6784\u9020 DatagramSocket \u548c DatagramPacket<\/p>\n

b. \u5efa\u7acb\u53d1\u9001\u7aef\u548c\u63a5\u6536\u7aef<\/p>\n

c. \u5efa\u7acb\u6570\u636e\u62a5<\/p>\n

d. \u8c03\u7528 Socket \u53d1\u9001，\u63a5\u6536<\/p>\n

e. \u5173\u95edSocket<\/p>\n

\u53d1\u9001\u7aef\u548c\u63a5\u6536\u7aef\u662f\u4e24\u4e2a\u72ec\u7acb\u7684\u7a0b\u5e8f<\/p>\n

\u793a\u4f8b：<\/p>\n

\u53d1\u9001\u7aef：<\/p>\n

package com.edu.net;<\/p>\n

import java.io.IOException;
\nimport java.net.DatagramPacket;
\nimport java.net.DatagramSocket;
\nimport java.net.InetAddress;
\nimport java.net.SocketException;
\nimport java.net.UnknownHostException;<\/p>\n

public class Sender {
\n\u00a0\u00a0 \u00a0public static void main(String[] args) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0try {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u6784\u5efa\u4e00\u4e2a\u7528\u6237\u6570\u636e\u62a5\u5957\u63a5\u5b57
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0DatagramSocket socket = new DatagramSocket();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u51c6\u5907\u6570\u636e
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0String str = "UDP \u6570\u636e\u62a5\u6d4b\u8bd5\u6570\u636e";
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0byte[] bytes = str.getBytes();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u8fd9\u91cc\u4e0d\u80fd\u7528str.length()，\u56e0\u4e3a\u5b57\u7b26\u4e32\u662f2\u4e2a\u5b57\u8282\u8868\u793a\u4e00\u4e2a\u5b57\u7b26，\u6211\u4eec\u8fd9\u91cc\u9700\u8981\u7684\u662f\u591a\u5c11\u4e2abyte\u5b57\u8282
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0int length = str.getBytes().length;
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u6784\u5efa\u4e00\u4e2a\u6570\u636e\u62a5 DataGramPacket，\u6307\u5b9a\u8981\u53d1\u9001\u7684\u6570\u636e，\u957f\u5ea6，\u4ee5\u53ca\u8981\u53bb\u5411\u7684\u76ee\u7684\u5730\u7684IP\u5730\u5740\u548c\u7aef\u53e3
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0DatagramPacket packet = new DatagramPacket(bytes, length, InetAddress.getByName("192.168.110.565"), 8888);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u53d1\u9001\u6570\u636e\u62a5
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.send(packet);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u5173\u95ed
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (SocketException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (UnknownHostException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (IOException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0}
\n}<\/p>\n

\u63a5\u6536\u7aef：<\/p>\n

package com.edu.net;<\/p>\n

import java.io.IOException;
\nimport java.net.DatagramPacket;
\nimport java.net.DatagramSocket;
\nimport java.net.SocketException;<\/p>\n

public class Receiver {<\/p>\n

\u00a0\u00a0 \u00a0public static void main(String[] args) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated method stub
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0try {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u521b\u5efaDataGramSocket，\u76d1\u542c 8888 \u7aef\u53e3
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0DatagramSocket socket = new DatagramSocket(8888);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u521b\u5efa buf \u6765\u63a5\u6536\u6570\u636e
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0byte[] buf = new byte[1024];
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0int len = buf.length;
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u6784\u5efa\u6570\u636e\u62a5
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0DatagramPacket packet = new DatagramPacket(buf, len);
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u63a5\u6536\u6570\u636e\u62a5
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.receive(packet);\/\/\u8be5\u65b9\u6cd5\u4f1a\u963b\u585e\u76f4\u5230\u6536\u5230\u53d1\u9001\u65b9\u7684\u6570\u636e\u62a5
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.out.println("\u63a5\u6536\u5230\u7684\u6570\u636e：" + new String(buf, 0, len));
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/\u5173\u95ed
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0socket.close();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (SocketException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0} catch (IOException e) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\/\/ TODO Auto-generated catch block
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0e.printStackTrace();
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0}
\n\u00a0\u00a0 \u00a0}<\/p>\n

}<\/p>\n

\u7ed3\u679c：\u5148\u542f\u52a8\u63a5\u6536\u7aef，\u518d\u542f\u52a8\u53d1\u9001\u7aef：<\/p>\n

\"\"<\/p>\n

（8）URL \u7c7b<\/p>\n

1）URL（Uniform Resource Locator）：\u7edf\u4e00\u8d44\u6e90\u5b9a\u4f4d\u7b26，\u5b83\u8868\u793a Internet \u4e0a\u67d0\u4e00\u4e2a\u8d44\u6e90\u7684\u5730\u5740<\/p>\n

2）\u5b83\u662f\u4e00\u79cd\u5177\u4f53\u7684 URI ，\u5373 URL \u53ef\u4ee5\u7528\u6765\u6807\u8bc6\u4e00\u4e2a\u8d44\u6e90，\u800c\u4e14\u8fd8\u6307\u660e\u4e86\u5982\u4f55 locate \u8fd9\u4e2a\u8d44\u6e90\u3002<\/p>\n

3）\u901a\u8fc7 URL \u6211\u4eec\u53ef\u4ee5\u8bbf\u95ee Internet \u4e0a\u7684\u5404\u79cd\u7f51\u7edc\u8d44\u6e90，\u6bd4\u5982\u5e38\u89c1\u7684 www，ftp \u7ad9\u70b9，\u6d4f\u89c8\u5668\u901a\u8fc7\u89e3\u6790\u7ed9\u5b9a\u7684URL \u53ef\u4ee5\u5728\u7f51\u7edc\u4e0a\u67e5\u627e\u76f8\u5e94\u7684\u6587\u4ef6\u6216\u5176\u4ed6\u8d44\u6e90\u3002<\/p>\n

4）URL \u7684\u57fa\u672c\u7ed3\u6784\u75315\u90e8\u5206\u7ec4\u6210：<\/p>\n

<\u4f20\u8f93\u534f\u8bae>:\/\/<\u4e3b\u673a\u540d\/\u57df\u540d\/IP\u5730\u5740>:<\u7aef\u53e3\u53f7>\/\u6587\u4ef6\u540d#\u7247\u6bb5\u540d?\u67e5\u8be2\u540d\u5217\u8868<\/p>\n

\u4f8b\u5982：<\/p>\n

http:\/\/192.168.1.100:8080\/helloworld\/index.jsp#a?username=xiaoming&password=123<\/p>\n

#\u7247\u6bb5\u540d：\u5373\u951a\u70b9，\u4f8b\u5982\u770b\u5c0f\u8bf4，\u76f4\u63a5\u5b9a\u4f4d\u5230\u7ae0\u8282<\/p>\n

\u67e5\u8be2\u540d\u5217\u8868\/\u8bf7\u6c42\u53c2\u6570：\u53c2\u6570\u540d=\u53c2\u6570\u503c&\u53c2\u6570\u540d=\u53c2\u6570\u503c<\/p>\n

5）URL \u7c7b\u6784\u9020\u5668<\/p>\n

a. \u4e3a\u4e86\u8868\u793a URL，java.net \u4e2d\u5b9e\u73b0\u4e86\u7c7b URL，\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e0b\u9762\u7684\u6784\u9020\u5668\u6765\u521d\u59cb\u5316 URL \u5bf9\u8c61:<\/p>\n

public URL(String spec)：\u901a\u8fc7\u4e00\u4e2a\u8868\u793a URL \u5730\u5740\u7684\u5b57\u7b26\u4e32\u6765\u6784\u9020\u4e00\u4e2aURL\u5bf9\u8c61<\/p>\n

\u4f8b\u5982：URL url = new URL(\u201chttp:\/\/www.163.com\u201d);<\/p>\n

public URL(URL conext,String spec)：\u901a\u8fc7\u57faURL\u548c\u76f8\u5bf9URL\u6784\u9020\u4e00\u4e2aURL\u5bf9\u8c61\u3002<\/p>\n

\u4f8b\u5982：URL url= new URL(url,\u201ddownload.html\u201d); \/\/ http:\/\/www.163.com\/download.html<\/p>\n

public URL(String protocol,String host,String file)<\/p>\n

\u4f8b\u5982：URL url = new URL(\u201chttp\u201d,\u201dwww.163.com\u201d,\u201ddownload.html\u201d); \/\/ http:\/\/www.163.com\/download.html<\/p>\n

public URL(String protocol,String host,int port,String file)<\/p>\n

\u4f8b\u5982：URL url = new URL(\u201chttp\u201d,\u201dwww.163.com\u201d,80,\u201ddownload.html\u201d)<\/p>\n

b. URL \u7c7b\u7684\u6784\u9020\u5668\u90fd\u58f0\u660e\u4e86\u629b\u51fa\u975e\u8fd0\u884c\u65f6\u5f02\u5e38，\u5fc5\u987b\u8981\u5bf9\u8fd9\u4e2a\u5f02\u5e38\u8fdb\u884c\u5904\u7406，\u901a\u5e38\u662f\u52a0\u4e0atry…catch\u8bed\u53e5\u8fdb\u884c\u6355\u83b7\u3002<\/p>\n

（9）\u9488\u5bf9\u4e8e HTTP \u534f\u8bae URLConnection \u7c7b<\/p>\n

1）URL \u7c7b\u7684\u65b9\u6cd5 openConnection()：\u80fd\u591f\u4ece\u7f51\u7edc\u4e0a\u8bfb\u53d6\u6570\u636e<\/p>\n

2）\u82e5\u5e0c\u671b\u8f93\u51fa\u6570\u636e，\u4f8b\u5982\u5411\u670d\u52a1\u7aef（Tomcat \u670d\u52a1\u5668（\u57fa\u4e8e HTTP \u534f\u8bae\u7684\u670d\u52a1\u5668））\u53d1\u9001\u4e00\u4e9b\u6570\u636e，\u5219\u5fc5\u987b\u5148\u4e0eURL\u5efa\u7acb\u8fde\u63a5，\u7136\u540e\u624d\u80fd\u5bf9\u5176\u8fdb\u884c\u8bfb\u5199，\u6b64\u65f6\u9700\u8981\u4f7f\u7528 URLConnection.<\/p>\n

3）URLConnection：\u8868\u793a\u5230 URL \u6240\u5f15\u7528\u7684\u8fdc\u7a0b\u5bf9\u8c61\u7684\u8fde\u63a5，\u5f53\u4e0e\u4e00\u4e2a URL \u5efa\u7acb\u8fde\u63a5\u65f6，\u9996\u5148\u8981\u5728\u4e00\u4e2a URL \u5bf9\u8c61\u4e0a\u901a\u8fc7 openConnection() \u751f\u6210\u5bf9\u5e94\u7684 URLConnection \u5bf9\u8c61，\u5982\u679c\u8fde\u63a5\u5931\u8d25，\u5c06\u4ea7\u751fIOException，\u4f8b\u5982：<\/p>\n

URL url = new URL(\u201chttp:\/\/localhost:8080\/index.jsp\u201d);<\/p>\n

URLConnection conn = url.openConnection();<\/p>\n

4）\u901a\u8fc7 URLConnection \u5bf9\u8c61\u83b7\u53d6\u8f93\u5165\u548c\u8f93\u51fa\u6d41，\u5c31\u53ef\u4ee5\u548c Tomcat \u670d\u52a1\u5668\u8fdb\u884c\u4ea4\u4e92，\u5e38\u89c1\u7684\u65b9\u6cd5\u6709：<\/p>\n

public Object getContent() throws IOException<\/p>\n

public int getConentLength()<\/p>\n

public String getContentType()<\/p>\n

public long getDate()<\/p>\n

public long getLastModified()<\/p>\n

public InputStream getInputStream() throws IOException<\/p>\n

public OutputStream getOutputStream() throws IOException<\/p>\n

（10）URI<\/p>\n

\u662f Uniform Resource Identifier，\u7edf\u4e00\u8d44\u6e90\u6807\u8bc6\u7b26，\u7528\u6765\u552f\u4e00\u7684\u6807\u8bc6\u4e00\u4e2a\u8d44\u6e90，\u800c URL \u662fUniform Resource Locator，\u7edf\u4e00\u8d44\u6e90\u5b9a\u4f4d\u7b26，\u5b83\u662f\u4e00\u79cd\u5177\u4f53\u7684 URI，\u5373 URL \u53ef\u4ee5\u7528\u6765\u6807\u8bc6\u4e00\u4e2a\u8d44\u6e90，\u800c\u4e14\u8fd8\u6307\u660e\u4e86\u5982\u4f55 locate \u8fd9\u4e2a\u8d44\u6e90，\u800cURN，Uniform Resource Name，\u7edf\u4e00\u8d44\u6e90\u547d\u540d，\u662f\u901a\u8fc7\u540d\u5b57\u6765\u6807\u8bc6\u8d44\u6e90，\u6bd4\u5982：mailto:xiaoming@126.com，\u4e5f\u5c31\u662f\u8bf4，URI \u662f\u4e00\u79cd\u62bd\u8c61\u7684，\u9ad8\u5c42\u6b21\u6982\u5ff5\u5b9a\u4e49\u7edf\u4e00\u8d44\u6e90\u6807\u8bc6，\u800c URL \u548c URN \u5219\u662f\u5177\u4f53\u7684\u8d44\u6e90\u6807\u8bc6\u7684\u65b9\u5f0f，URL \u548c URN \u90fd\u662f\u4e00\u79cd URI\u3002<\/p>\n

\u56db\u3001JDK17 \u65b0\u7279\u6027<\/h3>\n

1. JDK8 \u548c JDK17\u5171\u5b58：\u4fdd\u6301\u5148\u524d\u7684 JDK8 \u7684\u73af\u5883\u53d8\u91cf\u914d\u7f6e\u4e0d\u53d8<\/p>\n

\u5b89\u88c5 JDK17：\u4fdd\u6301\u9ed8\u8ba4\u7684\u8def\u5f84\u4e00\u8def\u5411\u524d\u4e0b\u4e00\u6b65\u3002<\/p>\n

(1) \u5728\u7cfb\u7edf\u73af\u5883\u53d8\u91cf\u4e2d\u65b0\u589e JDK8 \u548c JDK17 \u4e24\u4e2a\u73af\u5883\u53d8\u91cf，\u5206\u522b\u5f15\u7528 JDK8 \u548c JDK17 \u7684\u5b89\u88c5\u76ee\u5f55<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

(2) \u7136\u540e\u5c06\u4e4b\u524d\u914d\u7f6e\u7684\u7cfb\u7edf\u73af\u5883\u53d8\u91cf JAVA_HOME \u6539\u6210\u5982\u4e0b：\u6bd4\u5982\u6211\u4eec\u6539\u6765\u4f7f\u7528 JDK17<\/p>\n

\"\"<\/p>\n

\u4ee5\u540e\u6211\u4eec\u8981\u5207\u6362\u56deJDK8，\u90a3\u4e48\u5c31\u5c06\u201c\u53d8\u91cf\u503c\u201d\u6539\u4e3a\u201c%JDK8%\u201d<\/p>\n

\u7136\u540e\u7cfb\u7edf\u73af\u5883\u53d8\u91cfPath\u7684\u503c\u4fdd\u6301\u539f\u6765\u7684\u914d\u7f6e，\u7136\u540e\u9a8c\u8bc1\u4e00\u4e0b：<\/p>\n

\"\"<\/p>\n

(3) Eclipse \u4e2d\u914d\u7f6e JDK17<\/p>\n

\"\"<\/p>\n

\u65b0\u5efa\u4e00\u4e2a\u5de5\u7a0b：<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n<\/p>\n

\u4ece Springboot3.0 \u5f00\u59cb，\u5df2\u7ecf\u4e0d\u2f40\u6301 JDK8 \u4e86\u3002 \u4ece 3.0 \u5f00\u59cb，\u8f6c\u53d8\u4e3a JDK17\u3002<\/p>\n

Java17 \u662f\u957f\u671f\u652f\u6301\u7248\u672c（LTS），\u4e8e 2021 \u5e74 9 \u6708\u53d1\u5e03，\u662f\u7ee7 Java 11 \u4e4b\u540e\u7684\u53c8\u4e00\u4e2a\u91cd\u8981\u7684\u7a33\u5b9a\u7248\u672c\u3002Java17 \u63d0\u4f9b\u4e86\u8bb8\u591a\u8bed\u8a00\u7279\u6027\u548c API \u6539\u8fdb，\u540c\u65f6\u4e5f\u79fb\u9664\u4e86\u4e00\u4e9b\u8fc7\u65f6\u7684\u529f\u80fd，\u663e\u8457\u63d0\u9ad8\u4e86\u8bed\u8a00\u8868\u8fbe\u80fd\u529b\u548c\u8fd0\u884c\u65f6\u6027\u80fd\u3002<\/p>\n

2.\u4e0b\u9762\u6211\u4eec\u6765\u770b\u4e00\u4e0bJava17\u7684\u65b0\u7279\u6027：<\/p>\n

1. \u5bc6\u5c01\u7c7b（Sealed Classes）<\/p>\n

2.1 \u4ec0\u4e48\u662f\u5bc6\u5c01\u7c7b？<\/p>\n

\u5bc6\u5c01\u7c7b\u662f\u4e00\u79cd\u65b0\u7279\u6027，\u5141\u8bb8\u5f00\u53d1\u8005\u4e25\u683c\u63a7\u5236\u5b50\u7c7b\u7684\u7ee7\u627f\u3002\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u5bc6\u5c01\u7c7b，\u53ef\u4ee5\u9650\u5236\u54ea\u4e9b\u7c7b\u80fd\u591f\u7ee7\u627f\u5b83\u3002<\/p>\n

2.2 \u4f7f\u7528\u573a\u666f<\/p>\n

\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u7ee7\u627f\u5173\u7cfb\u3002<\/p>\n

\u66f4\u597d\u7684\u4ee3\u7801\u5b89\u5168\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n

\u907f\u514d\u4e86\u610f\u5916\u7684\u7c7b\u6269\u5c55\u3002<\/p>\n

3.3 \u793a\u4f8b<\/p>\n

\"\"<\/p>\n

2.4 \u5173\u952e\u5b57\u8bf4\u660e<\/p>\n

sealed：\u5b9a\u4e49\u5bc6\u5c01\u7c7b\u3002<\/p>\n

permits：\u6307\u5b9a\u5141\u8bb8\u7ee7\u627f\u5bc6\u5c01\u7c7b\u7684\u5b50\u7c7b\u3002<\/p>\n

non-sealed：\u5141\u8bb8\u5b50\u7c7b\u53d6\u6d88\u5bc6\u5c01\u3002<\/p>\n

final：\u5b50\u7c7b\u4e0d\u80fd\u518d\u88ab\u7ee7\u627f\u3002<\/p>\n

3. var\u5173\u952e\u5b57<\/p>\n

\u4ece Java10 \u5f00\u59cb，var \u88ab\u5f15\u2f0a<\/p>\n

var name = "zhangsan";<\/p>\n

var age = 10;<\/p>\n

\u4e0a\u8ff0\u4ee3\u7801\u4e2d，\u7f16\u8bd1\u5668\u4f1a\u2f83\u52a8\u63a8\u65ad\u51fa name \u662f\u2f00\u4e2a String \u7c7b\u578b，age \u662f\u2f00\u4e2a int \u7c7b\u578b\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u4f7f\u2f64 var？<\/p>\n

\u4f7f\u2f64 var \u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3002\u6709\u65f6\u5019，\u7c7b\u578b\u540d\u79f0\u53ef\u80fd\u4f1a\u2fae\u5e38\u2ed3，\u4f8b\u5982\u6cdb\u578b\u3002var \u5c31\u50cf\u662f\u2f00\u4e2a\u7b80\u5316\u5668，\u8ba9\u4f60\u4e0d\u5fc5\u53cd\u590d\u5199\u51fa\u7e41\u7410\u7684\u7c7b\u578b\u540d\u3002<\/p>\n

\"\"<\/p>\n

\u4f7f\u2f64\u6ce8\u610f\u4e8b\u9879：<\/p>\n

1. \u4e0d\u80fd\u4f7f\u2f64 var \u6765\u58f0\u660e\u5b57\u6bb5（\u7c7b\u5c5e\u6027）<\/p>\n

2. \u4e0d\u80fd\u4f7f\u2f64 var \u6765\u58f0\u660e\u2f45\u6cd5\u53c2\u6570<\/p>\n

3. \u4e0d\u80fd\u4f7f\u2f64 var \u6765\u58f0\u660e\u2f45\u6cd5\u8fd4\u56de\u7c7b\u578b<\/p>\n

4. var \u58f0\u660e\u53d8\u91cf\u5fc5\u987b\u521d\u59cb\u5316，\u4f46\u662f\u4e0d\u80fd\u521d\u59cb\u5316\u4e3a null<\/p>\n

\u4f8b\u5982：<\/p>\n

\"\"<\/p>\n

4. \u6587\u672c\u5757<\/p>\n

\u8fd9\u4e2a\u66f4\u65b0\u975e\u5e38\u5b9e\u7528\u3002\u5728\u6ca1\u6709\u8fd9\u4e2a\u7279\u6027\u4e4b\u524d，\u7f16\u5199\u957f\u6587\u672c\u975e\u5e38\u75db\u82e6\u3002\u867d\u7136 IDEA \u7b49\u96c6\u6210\u5f00\u53d1\u5de5\u5177\u53ef\u4ee5\u81ea\u52a8\u5904\u7406，\u4f46\u6700\u7ec8\u6548\u679c\u4ecd\u7136\u4e11\u964b，\u5145\u6ee1\u62fc\u63a5\u7b26\u53f7\u3002\u73b0\u5728，\u901a\u8fc7\u5b57\u7b26\u4e32\u5757，\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u7f16\u5199 JSON\u3001HTML\u3001SQL \u7b49\u5185\u5bb9，\u6548\u679c\u66f4\u6e05\u723d\u3002<\/p>\n

\u793a\u4f8b：<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

5. NullPointerException \u589e\u5f3a<\/p>\n

\u7a7a\u6307\u9488\u5f02\u5e38（NPE）\u4e00\u76f4\u662f Java \u7a0b\u5e8f\u5458\u7684\u75db\u70b9，\u56e0\u4e3a\u62a5\u9519\u4fe1\u606f\u65e0\u6cd5\u76f4\u89c2\u5730\u6307\u51fa\u54ea\u4e2a\u5bf9\u8c61\u4e3a\u7a7a，\u53ea\u629b\u51fa\u4e00\u4e2a NullPointerException \u548c\u4e00\u5806\u5806\u6808\u4fe1\u606f，\u5b9a\u4f4d\u95ee\u9898\u8017\u65f6\u4e14\u9ebb\u70e6\u3002\u5c24\u5176\u5728\u9047\u5230\u7ea7\u8054\u8c03\u7528\u7684\u4ee3\u7801\u65f6，\u9010\u884c\u6392\u67e5\u66f4\u662f\u4ee4\u4eba\u5934\u75bc\u3002\u5982\u679c\u5728\u6d4b\u8bd5\u73af\u5883\u4e2d，\u53ef\u80fd\u8fd8\u9700\u901a\u8fc7\u8fdc\u7a0b\u8c03\u8bd5\u67e5\u660e\u7a7a\u5bf9\u8c61，\u8d39\u65f6\u8d39\u529b\u3002Java17 \u7ec8\u4e8e\u5728\u8fd9\u65b9\u9762\u53d6\u5f97\u4e86\u7a81\u7834，\u63d0\u4f9b\u4e86\u66f4\u8be6\u7ec6\u7684\u7a7a\u6307\u9488\u5f02\u5e38\u4fe1\u606f，\u5e2e\u52a9\u5f00\u53d1\u8005\u8fc5\u901f\u5b9a\u4f4d\u95ee\u9898\u6e90\u5934\u3002<\/p>\n

\"\"<\/p>\n<\/p>\n

6. Records<\/p>\n

\u5728 Java \u4e2d，POJO（\u666e\u901a\u7684Java\u5bf9\u8c61，\u53ef\u4ee5\u7406\u89e3\u4e3a\u5c31\u662f JavaBean）\u5bf9\u8c61（\u5982DO\u3001PO\u3001VO\u3001DTO\u7b49）\u901a\u5e38\u5305\u542b\u6210\u5458\u53d8\u91cf\u53ca\u76f8\u5e94\u7684 Getter \u548c Setter \u65b9\u6cd5\u3002\u5c3d\u7ba1\u53ef\u4ee5\u901a\u8fc7\u5de5\u5177\u6216 IDE \u751f\u6210\u8fd9\u4e9b\u4ee3\u7801，\u4f46\u4fee\u6539\u548c\u7ef4\u62a4\u4ecd\u7136\u9ebb\u70e6\u3002\u4e3a\u6b64，Java \u5f15\u5165\u4e86\u6807\u51c6\u89e3\u51b3\u65b9\u6848：Records\u3002\u5b83\u901a\u8fc7\u7b80\u6d01\u7684\u8bed\u6cd5\u5b9a\u4e49\u6570\u636e\u7c7b，\u5927\u5927\u7b80\u5316\u4e86 POJO \u7c7b\u7684\u7f16\u5199，\u5982\u4e0b\u6240\u793a\u3002\u867d\u7136 hashcode \u548c equals \u65b9\u6cd5\u4ecd\u9700\u624b\u52a8\u7f16\u5199，\u4f46 IDE \u80fd\u591f\u81ea\u52a8\u751f\u6210\u3002\u8fd9\u4e00\u7279\u6027\u6709\u6548\u89e3\u51b3\u4e86\u6a21\u677f\u4ee3\u7801\u95ee\u9898，\u63d0\u5347\u4e86\u4ee3\u7801\u6574\u6d01\u5ea6\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n

\u793a\u4f8b：<\/p>\n

\"\"<\/p>\n<\/p>\n

7. \u5168\u65b0\u7684switch\u8868\u8fbe\u5f0f<\/p>\n

\u5728 Java12 \u7684\u65f6\u5019\u5c31\u5f15\u5165\u4e86 switch \u8868\u8fbe\u5f0f，\u6ce8\u610f\u8fd9\u91cc\u662f\u8868\u8fbe\u5f0f，\u800c\u4e0d\u662f\u8bed\u53e5，\u539f\u6765\u7684 switch \u662f\u8bed\u53e5\u3002\u4e3b\u8981\u7684\u5dee\u522b\u5c31\u662f\u5c31\u662f\u8868\u8fbe\u5f0f\u6709\u8fd4\u56de\u503c，\u800c\u8bed\u53e5\u5219\u6ca1\u6709\u3002\u518d\u914d\u5408\u6a21\u5f0f\u5339\u914d，\u4ee5\u53ca yield \u548c \u201c->\u201d \u7b26\u53f7\u7684\u52a0\u5165，\u5168\u65b0\u7684switch \u7528\u8d77\u6765\u723d\u5230\u98de\u8d77\u6765\u3002<\/p>\n

\u793a\u4f8b：<\/p>\n

package com.edu.jdk17;
\npublic class SwitchDemo {
\n\u00a0 \u00a0 \/**
\n\u00a0 \u00a0 \u00a0* \u5728JDK8\u4e2d\u83b7\u53d6 switch \u8fd4\u56de\u503c\u65b9\u5f0f
\n\u00a0 \u00a0 \u00a0*
\n\u00a0 \u00a0 \u00a0* @param week
\n\u00a0 \u00a0 \u00a0* @return
\n\u00a0 \u00a0 \u00a0*\/
\n\u00a0 \u00a0 public static int getByJDK8(Week week) {
\n\u00a0 \u00a0 \u00a0 \u00a0 int i = 0;
\n\u00a0 \u00a0 \u00a0 \u00a0 switch (week) {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case MONDAY, TUESDAY:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case WEDNESDAY:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 3;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case THURSDAY:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 4;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case FRIDAY:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 5;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case SATURDAY:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 6;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case SUNDAY:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 7;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 default:
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 i = 0;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 return i;
\n\u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \/**
\n\u00a0 \u00a0 \u00a0* \u5728JDK17\u4e2d\u83b7\u53d6switch\u8fd4\u56de\u503c
\n\u00a0 \u00a0 \u00a0*
\n\u00a0 \u00a0 \u00a0* @param week
\n\u00a0 \u00a0 \u00a0* @return
\n\u00a0 \u00a0 \u00a0*\/
\n\u00a0 \u00a0 public static int getByJDK17(Week week) {
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 1, \u73b0\u5728\u7684switch\u53d8\u6210\u4e86\u8868\u8fbe\u5f0f，\u53ef\u4ee5\u8fd4\u56de\u503c\u4e86，\u800c\u4e14\u652f\u6301yield\u548c->\u7b26\u53f7\u6765\u8fd4\u56de\u503c
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 2, \u518d\u4e5f\u4e0d\u7528\u62c5\u5fc3\u6f0f\u5199\u4e86break，\u800c\u5bfc\u81f4\u51fa\u95ee\u9898\u4e86
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 3, case\u540e\u9762\u652f\u6301\u5199\u591a\u4e2a\u6761\u4ef6
\n\u00a0 \u00a0 \u00a0 \u00a0 return switch (week) {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case MONDAY -> 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case TUESDAY -> 2;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case WEDNESDAY -> 3;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case THURSDAY -> 4;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case FRIDAY -> 5;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 case SATURDAY, SUNDAY -> 6;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 default -> 0;
\n\u00a0 \u00a0 \u00a0 \u00a0 };
\n\u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 private enum Week {
\n\u00a0 \u00a0 \u00a0 \u00a0 MONDAY,
\n\u00a0 \u00a0 \u00a0 \u00a0 TUESDAY,
\n\u00a0 \u00a0 \u00a0 \u00a0 WEDNESDAY,
\n\u00a0 \u00a0 \u00a0 \u00a0 THURSDAY,
\n\u00a0 \u00a0 \u00a0 \u00a0 FRIDAY,
\n\u00a0 \u00a0 \u00a0 \u00a0 SATURDAY,
\n\u00a0 \u00a0 \u00a0 \u00a0 SUNDAY
\n\u00a0 \u00a0 }
\n\u00a0 \u00a0\u00a0
\n\u00a0 \u00a0 public static void main(String[] args) {
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0System.out.println(getByJDK17(Week.SATURDAY));
\n\u00a0\u00a0 \u00a0}
\n}<\/p>\n

\"\"<\/p>\n

8. \u79c1\u6709\u63a5\u53e3\u65b9\u6cd5<\/p>\n

\u4ece Java8 \u5f00\u59cb，\u5141\u8bb8\u5728 interface \u91cc\u9762\u6dfb\u52a0\u9ed8\u8ba4\u65b9\u6cd5，\u5176\u5b9e\u5f53\u65f6\u5c31\u6709\u4e9b\u5c0f\u56f0\u60d1，\u5982\u679c\u4e00\u4e2a default \u65b9\u6cd5\u4f53\u5f88\u5927\u600e\u4e48\u529e，\u62c6\u5230\u53e6\u5916\u7684\u7c7b\u53bb\u5199\u5417？\u5b9e\u5728\u6709\u4e9b\u4e0d\u592a\u5408\u7406，\u6240\u4ee5\u5728 Java17 \u91cc\u9762，\u5982\u679c\u4e00\u4e2a default \u65b9\u6cd5\u4f53\u5f88\u5927，\u90a3\u4e48\u53ef\u4ee5\u901a\u8fc7\u65b0\u589e\u63a5\u53e3\u79c1\u6709\u65b9\u6cd5\u6765\u8fdb\u884c\u4e00\u4e2a\u5408\u7406\u7684\u62c6\u5206\u4e86\u3002<\/p>\n

\"\"<\/p>\n

9. \u6a21\u5f0f\u5339\u914d<\/p>\n

\u5728 JDK17 \u4e2d，\u6a21\u5f0f\u5339\u914d\u4e3b\u8981\u7528\u4e8e instanceof \u8868\u8fbe\u5f0f\u3002\u6a21\u5f0f\u5339\u914d\u589e\u5f3a\u4e86 instanceof \u7684\u8bed\u6cd5\u548c\u529f\u80fd，\u4f7f\u7c7b\u578b\u68c0\u67e5\u548c\u7c7b\u578b\u8f6c\u6362\u66f4\u52a0\u7b80\u6d01\u548c\u9ad8\u6548\u3002\u5728\u4f20\u7edf\u7684 Java \u7248\u672c\u4e2d，\u6211\u4eec\u901a\u5e38\u4f7f\u7528 instanceof \u7ed3\u5408\u7c7b\u578b\u8f6c\u6362\u6765\u5224\u65ad\u5bf9\u8c61\u7c7b\u578b\u5e76\u8fdb\u884c\u5904\u7406，\u8fd9\u5f80\u5f80\u4f1a\u5bfc\u81f4\u5197\u957f\u7684\u4ee3\u7801\u3002<\/p>\n

\"\"<\/p>\n

10. \u96c6\u5408\u7c7b\u7684\u5de5\u5382\u65b9\u6cd5<\/p>\n

\u5728 Java8 \u7684\u5e74\u4ee3，\u5373\u4fbf\u521b\u5efa\u4e00\u4e2a\u5f88\u5c0f\u7684\u96c6\u5408，\u6216\u8005\u56fa\u5b9a\u5143\u7d20\u7684\u96c6\u5408\u90fd\u662f\u6bd4\u8f83\u9ebb\u70e6\u7684，\u4e3a\u4e86\u7b80\u6d01\u4e00\u4e9b，\u6709\u65f6\u6211\u751a\u81f3\u4f1a\u5f15\u5165\u4e00\u4e9b\u4f9d\u8d56\u3002<\/p>\n

\"\"<\/p>\n

11. JDK17 \u7684\u5176\u4ed6\u7279\u6027<\/p>\n

（1） \u65b0\u7684String\u65b9\u6cd5<\/p>\n

repeat：\u91cd\u590d\u751f\u6210\u5b57\u7b26\u4e32<\/p>\n

isBlank：\u4e0d\u7528\u5728\u5f15\u5165\u7b2c\u4e09\u65b9\u5e93\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5b57\u7b26\u4e32\u5224\u7a7a\u4e86<\/p>\n

strip：\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u8fb9\u7684\u7a7a\u683c，\u652f\u6301\u5168\u89d2\u548c\u534a\u89d2，\u4e4b\u524d\u7684trim\u53ea\u652f\u6301\u534a\u89d2<\/p>\n

lines：\u80fd\u6839\u636e\u4e00\u6bb5\u5b57\u7b26\u4e32\u4e2d\u7684\u7ec8\u6b62\u7b26\u63d0\u53d6\u51fa\u884c\u4e3a\u5355\u4f4d\u7684\u6d41<\/p>\n

indent：\u7ed9\u5b57\u7b26\u4e32\u505a\u7f29\u8fdb，\u63a5\u53d7\u4e00\u4e2aint\u578b\u7684\u8f93\u5165<\/p>\n

transform：\u63a5\u53d7\u4e00\u4e2a\u8f6c\u6362\u51fd\u6570，\u5b9e\u73b0\u5b57\u7b26\u4e32\u7684\u8f6c\u6362<\/p>\n

（2） Stream API\u7684\u589e\u5f3a<\/p>\n

\u589e\u52a0 takeWhile, dropWhile, ofNullable, iterate \u4ee5\u53ca toList \u7684API，\u8d8a\u6765\u8d8a\u50cf\u4e00\u4e9b\u51fd\u6570\u5f0f\u8bed\u8a00\u4e86\u3002<\/p>\n

\u7528\u6cd5\u4e3e\u4f8b：<\/p>\n

\"\"<\/p>\n

（3） Jshell<\/p>\n

\u5728\u65b0\u7684 JDK \u7248\u672c\u4e2d，\u652f\u6301\u76f4\u63a5\u5728\u547d\u4ee4\u884c\u4e0b\u6267\u884c java \u7a0b\u5e8f，\u7c7b\u4f3c\u4e8e python \u7684\u4ea4\u4e92\u5f0f REPL\u3002\u7b80\u800c\u8a00\u4e4b，\u4f7f\u7528 JShell，\u4f60\u53ef\u4ee5\u8f93\u5165\u4ee3\u7801\u7247\u6bb5\u5e76\u9a6c\u4e0a\u770b\u5230\u8fd0\u884c\u7ed3\u679c，\u7136\u540e\u5c31\u53ef\u4ee5\u6839\u636e\u9700\u8981\u4f5c\u51fa\u8c03\u6574，\u8fd9\u6837\u5728\u9a8c\u8bc1\u4e00\u4e9b\u7b80\u5355\u7684\u4ee3\u7801\u7684\u65f6\u5019，\u5c31\u53ef\u4ee5\u901a\u8fc7 Jshell \u5f97\u5230\u5feb\u901f\u5730\u9a8c\u8bc1，\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n

（4） java \u547d\u4ee4\u76f4\u63a5\u6267\u884c java \u6587\u4ef6<\/p>\n

\u5728\u73b0\u5728\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u6267\u884cjava xxx.java，\u5373\u53ef\u8fd0\u884c\u8be5 java \u6587\u4ef6，\u65e0\u987b\u5148\u6267\u884c javac，\u7136\u540e\u518d\u6267\u884c java，\u662f\u4e0d\u662f\u53c8\u7b80\u5355\u4e86\u4e00\u6b65\u3002<\/p>\n

（5） ZGC<\/p>\n

\u5728 ParallelOldGC\u3001CMS \u548c G1 \u4e4b\u540e，JDK11 \u5f15\u5165\u4e86\u5168\u65b0\u7684 ZGC（Z Garbage Collector）\u3002\u5b98\u65b9\u5ba3\u79f0 ZGC \u7684\u5783\u573e\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e0d\u8d85\u8fc710ms，\u80fd\u652f\u6301\u9ad8\u8fbe 16TB \u7684\u5806\u7a7a\u95f4，\u5e76\u4e14\u505c\u987f\u65f6\u95f4\u4e0d\u4f1a\u968f\u7740\u5806\u7684\u589e\u5927\u800c\u589e\u52a0\u3002<\/p>\n

\u90a3\u4e48，ZGC \u5230\u5e95\u89e3\u51b3\u4e86\u4ec0\u4e48\u95ee\u9898？Oracle \u5b98\u65b9\u4ecb\u7ecd\u5b83\u662f\u4e00\u4e2a\u53ef\u4f38\u7f29\u7684\u4f4e\u5ef6\u8fdf\u5783\u573e\u56de\u6536\u5668，\u65e8\u5728\u964d\u4f4e\u505c\u987f\u65f6\u95f4，\u5c3d\u7ba1\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u541e\u5410\u91cf\u7684\u964d\u4f4e\u3002\u4e0d\u8fc7，\u901a\u8fc7\u6a2a\u5411\u6269\u5c55\u670d\u52a1\u5668\u53ef\u4ee5\u89e3\u51b3\u541e\u5410\u91cf\u95ee\u9898\u3002\u5b98\u65b9\u5df2\u5efa\u8bae ZGC \u53ef\u7528\u4e8e\u751f\u4ea7\u73af\u5883，\u8fd9\u65e0\u7591\u5c06\u6210\u4e3a\u672a\u6765\u7684\u4e3b\u6d41\u5783\u573e\u56de\u6536\u5668\u3002<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

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