{"id":48493,"date":"2025-07-30T12:15:33","date_gmt":"2025-07-30T04:15:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/48493.html"},"modified":"2025-07-30T12:15:33","modified_gmt":"2025-07-30T04:15:33","slug":"java%e5%8a%a8%e6%80%81%e4%bb%a3%e7%a0%81%e5%88%86%e6%9e%90%e7%9a%843%e4%b8%aa%e6%80%a5%e6%95%91%e5%8c%85%ef%bc%9a1%e4%b8%aa%e5%91%bd%e4%bb%a4%e7%a7%92%e6%9d%80%e6%9c%8d%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/48493.html","title":{"rendered":"Java\u52a8\u6001\u4ee3\u7801\u5206\u6790\u76843\u4e2a\u2018\u6025\u6551\u5305\u2019\uff1a1\u4e2a\u547d\u4ee4\u79d2\u6740\u670d\u52a1\u5668\u5d29\u6e83\uff1f\u52a8\u6001\u4ee3\u7406\u6bd4\u533b\u751f\u8fd8\u51c6\uff1f"},"content":{"rendered":"<p>&#x1f525;\u5173\u6ce8\u58a8\u747e\u8f69&#xff0c;\u5e26\u4f60\u63a2\u7d22\u7f16\u7a0b\u7684\u5965\u79d8&#xff01;&#x1f680;<br \/>\n&#x1f525;\u8d85\u840c\u6280\u672f\u653b\u7565&#xff0c;\u8f7b\u677e\u664b\u7ea7\u7f16\u7a0b\u9ad8\u624b&#x1f680;<br \/>\n&#x1f525;\u6280\u672f\u5b9d\u5e93\u5df2\u5907\u597d&#xff0c;\u5c31\u7b49\u4f60\u6765\u6316\u6398&#x1f680;<br \/>\n&#x1f525;\u8ba2\u9605\u58a8\u747e\u8f69&#xff0c;\u667a\u8da3\u5b66\u4e60\u4e0d\u5b64\u5355&#x1f680;<br \/>\n&#x1f525;\u5373\u523b\u542f\u822a&#xff0c;\u7f16\u7a0b\u4e4b\u65c5\u66f4\u6709\u8da3&#x1f680;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730041531-68899c6399282.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730041531-68899c63f1a4d.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f50d;  Java\u52a8\u6001\u4ee3\u7801\u5206\u6790\u7684\u201c\u4e09\u5927\u795e\u5668\u201d<\/h3>\n<hr \/>\n<h4>&#x1f6e0;\ufe0f \u795e\u56681&#xff1a;Arthas\u2014\u2014\u201c\u6025\u8bca\u533b\u751f\u201d\u6a21\u5f0f<\/h4>\n<p>\u73b0\u8c61\u63cf\u8ff0&#xff1a;<br \/>\n\u7ebf\u4e0a\u5e94\u7528\u7a81\u7136\u201c\u6302\u673a\u201d&#xff0c;\u50cf\u201c\u4e2d\u90aa\u201d\u4e00\u6837\u65e0\u6cd5\u54cd\u5e94&#xff01;<\/p>\n<p>\u771f\u76f8\u63ed\u9732&#xff1a;<br \/>\n\u9700\u8981\u4e00\u4e2a\u201c\u5b9e\u65f6\u8bca\u65ad\u4eea\u201d\u6765\u900f\u89c6\u8fd0\u884c\u65f6\u4ee3\u7801&#xff01;<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<br \/>\nArthas\u2014\u2014\u963f\u91cc\u7cfb\u7684Java\u8bca\u65ad\u795e\u5668<\/p>\n<hr \/>\n<h5>\u4ee3\u7801\u793a\u4f8b&#xff1a;\u7528Arthas\u5b9a\u4f4d\u7ebf\u7a0b\u963b\u585e<\/h5>\n<p><span class=\"token comment\"># 1. \u5b89\u88c5Arthas&#xff08;1\u884c\u547d\u4ee4\u641e\u5b9a&#xff09;<\/span><br \/>\n<span class=\"token function\">curl<\/span> -O https:\/\/arthas.aliyun.com\/arthas-boot.jar<br \/>\njava -jar arthas-boot.jar<\/p>\n<p><span class=\"token comment\"># 2. \u9009\u62e9\u76ee\u6807Java\u8fdb\u7a0b&#xff08;\u8f93\u5165\u8fdb\u7a0b\u53f7&#xff09;<\/span><br \/>\n$ java -jar arthas-boot.jar<br \/>\n<span class=\"token punctuation\">[<\/span>INFO<span class=\"token punctuation\">]<\/span> Arthas client connected<br \/>\n<span class=\"token punctuation\">[<\/span>INFO<span class=\"token punctuation\">]<\/span> Press <span class=\"token operator\">&lt;<\/span>enter<span class=\"token operator\">&gt;<\/span> to start<span class=\"token punctuation\">..<\/span>.<\/p>\n<p><span class=\"token comment\"># 3. \u67e5\u770b\u7cfb\u7edf\u5b9e\u65f6\u72b6\u6001&#xff08;dashboard&#xff09;<\/span><br \/>\narthas&#064;xxx<span class=\"token operator\">&gt;<\/span> dashboard<br \/>\n<span class=\"token comment\"># \u8f93\u51fa\u793a\u4f8b&#xff1a;<\/span><br \/>\n&#8212;&#8212;- Dashboard <span class=\"token number\">2025<\/span>-04-26 <span class=\"token number\">12<\/span>:10:56 &#8212;&#8212;-<br \/>\nJVM \u57fa\u7840\u4fe1\u606f&#xff1a;<br \/>\n  JVM\u7248\u672c&#xff1a;17.0.8<br \/>\n  JVM\u542f\u52a8\u65f6\u95f4&#xff1a;2025-04-26 <span class=\"token number\">10<\/span>:00:00<br \/>\n  JVM\u5185\u5b58&#xff1a;\u603b\u5185\u5b58 16GB&#xff0c;\u5df2\u7528 12GB&#xff0c;\u7a7a\u95f2 4GB<br \/>\n  GC\u7edf\u8ba1&#xff1a;\u6700\u8fd11\u5206\u949f Young GC <span class=\"token number\">3<\/span>\u6b21&#xff0c;\u8017\u65f6 200ms<\/p>\n<p>\u7ebf\u7a0b\u72b6\u6001&#xff1a;<br \/>\n  \u603b\u7ebf\u7a0b\u6570&#xff1a;200<br \/>\n  RUNNABLE&#xff1a;150&#xff08;\u5360\u6bd475%&#xff09;<br \/>\n  BLOCKED&#xff1a;30&#xff08;\u963b\u585e&#xff01;\u9700\u8981\u6392\u67e5&#xff09;<br \/>\n  WAITING&#xff1a;20<\/p>\n<p>\u5f02\u5e38\u7edf\u8ba1&#xff1a;<br \/>\n  \u6700\u8fd11\u5206\u949f\u629b\u51fa\u5f02\u5e38&#xff1a;NullPointerException \u00d75&#xff0c;TimeoutException \u00d73<\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 3&#xff1a;dashboard\u547d\u4ee4\u5b9e\u65f6\u76d1\u63a7JVM\u72b6\u6001&#xff0c;\u5feb\u901f\u5b9a\u4f4d\u5185\u5b58\u6cc4\u6f0f\u3001\u7ebf\u7a0b\u963b\u585e\u7b49\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>\u5347\u7ea7\u65b9\u6848&#xff1a;\u7528thread\u547d\u4ee4\u63ea\u51fa\u201c\u5835\u8f66\u7ebf\u7a0b\u201d<\/h5>\n<p><span class=\"token comment\"># 4. \u67e5\u770b\u6240\u6709\u7ebf\u7a0b\u5806\u6808<\/span><br \/>\narthas&#064;xxx<span class=\"token operator\">&gt;<\/span> thread<br \/>\n<span class=\"token comment\"># \u8f93\u51fa\u793a\u4f8b&#xff1a;<\/span><br \/>\nThread Id: <span class=\"token number\">1234<\/span> <span class=\"token punctuation\">(<\/span>name<span class=\"token operator\">&#061;<\/span>pool-1-thread-1, <span class=\"token assign-left variable\">state<\/span><span class=\"token operator\">&#061;<\/span>BLOCKED<span class=\"token punctuation\">)<\/span><br \/>\nStack Trace:<br \/>\n  at com.example.service.UserService.getUserById<span class=\"token punctuation\">(<\/span>UserService.java:23<span class=\"token punctuation\">)<\/span><br \/>\n  at com.example.controller.UserController.getProfile<span class=\"token punctuation\">(<\/span>UserController.java:45<span class=\"token punctuation\">)<\/span><br \/>\n  &#8211; locked <span class=\"token operator\">&lt;<\/span>0x000000076a1c4a1<span class=\"token operator\"><span class=\"token file-descriptor important\">0<\/span>&gt;<\/span> <span class=\"token punctuation\">(<\/span>a java.lang.Object<span class=\"token punctuation\">)<\/span><br \/>\n  at java.base&#064;17.0.8\/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0<span class=\"token punctuation\">(<\/span>Native Method<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># 5. \u67e5\u770b\u963b\u585e\u7ebf\u7a0b\u8be6\u60c5<\/span><br \/>\narthas&#064;xxx<span class=\"token operator\">&gt;<\/span> thread -b<br \/>\n<span class=\"token comment\"># \u8f93\u51fa\u793a\u4f8b&#xff1a;<\/span><br \/>\nBlocked Threads:<br \/>\n  Thread-1234 is blocked on lock <span class=\"token operator\">&lt;<\/span>0x000000076a1c4a1<span class=\"token operator\"><span class=\"token file-descriptor important\">0<\/span>&gt;<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 4&#xff1a;thread\u547d\u4ee4\u663e\u793a\u6240\u6709\u7ebf\u7a0b\u72b6\u6001&#xff0c;-b\u53c2\u6570\u8fc7\u6ee4\u963b\u585e\u7ebf\u7a0b\u3002<\/li>\n<li>Step 5&#xff1a;\u901a\u8fc7\u5806\u6808\u8ffd\u8e2a&#xff0c;\u53d1\u73b0getUserById\u65b9\u6cd5\u56e0\u9501\u7ade\u4e89\u5bfc\u81f4\u963b\u585e\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>\u7ec8\u6781\u65b9\u6848&#xff1a;\u7528watch\u547d\u4ee4\u201c\u5077\u7aa5\u201d\u65b9\u6cd5\u6267\u884c<\/h5>\n<p><span class=\"token comment\"># 6. \u76d1\u63a7\u65b9\u6cd5\u5165\u53c2\u548c\u8017\u65f6<\/span><br \/>\narthas&#064;xxx<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">watch<\/span> com.example.service.UserService getUserById <span class=\"token string\">&#039;{params, returnObj, #cost}&#039;<\/span> -x <span class=\"token number\">2<\/span> -b -s -n <span class=\"token number\">5<\/span><br \/>\n<span class=\"token comment\"># \u8f93\u51fa\u793a\u4f8b&#xff1a;<\/span><br \/>\nPress Q or q to abort.<br \/>\n<span class=\"token punctuation\">[<\/span>watch<span class=\"token punctuation\">]<\/span> Result:<br \/>\nMethod: getUserById<br \/>\nParameters: <span class=\"token punctuation\">[<\/span>id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">]<\/span><br \/>\nReturn: User<span class=\"token punctuation\">{<\/span>name<span class=\"token operator\">&#061;<\/span>Alice, <span class=\"token assign-left variable\">id<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">}<\/span><br \/>\nCost Time: <span class=\"token number\">200<\/span> ms<br \/>\n<span class=\"token punctuation\">[<\/span>watch<span class=\"token punctuation\">]<\/span> Result:<br \/>\nMethod: getUserById<br \/>\nParameters: <span class=\"token punctuation\">[<\/span>id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">456<\/span><span class=\"token punctuation\">]<\/span><br \/>\nReturn: null <span class=\"token punctuation\">(<\/span>\u5f02\u5e38&#xff01;<span class=\"token punctuation\">)<\/span><br \/>\nCost Time: <span class=\"token number\">800<\/span> ms <span class=\"token punctuation\">(<\/span>\u8d85\u65f6&#xff01;<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 6&#xff1a;watch\u547d\u4ee4\u52a8\u6001\u76d1\u63a7\u65b9\u6cd5\u8c03\u7528&#xff0c;\u53c2\u6570-x 2\u5c55\u5f00\u5d4c\u5957\u5bf9\u8c61&#xff0c;#cost\u663e\u793a\u6267\u884c\u8017\u65f6\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>&#x1f31f; \u795e\u56682&#xff1a;\u52a8\u6001\u4ee3\u7406\u2014\u2014\u201c\u95f4\u8c0d\u201d\u76d1\u63a7\u672f<\/h4>\n<p>\u73b0\u8c61\u63cf\u8ff0&#xff1a;<br \/>\n\u60f3\u5728\u65b9\u6cd5\u6267\u884c\u524d\u540e\u201c\u5077\u5077\u57cb\u4f0f\u7b14\u201d&#xff0c;\u4f46\u53c8\u4e0d\u60f3\u6539\u4ee3\u7801&#xff1f;<\/p>\n<p>\u771f\u76f8\u63ed\u9732&#xff1a;<br \/>\n\u9700\u8981\u4e00\u4e2a\u201c\u65e0\u75d5\u76d1\u63a7\u5668\u201d\u6765\u52a8\u6001\u63d2\u5165\u903b\u8f91&#xff01;<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<br \/>\nJDK\u52a8\u6001\u4ee3\u7406 &#043; \u81ea\u5b9a\u4e49\u62e6\u622a\u5668<\/p>\n<hr \/>\n<h5>\u4ee3\u7801\u793a\u4f8b&#xff1a;\u7528\u52a8\u6001\u4ee3\u7406\u8bb0\u5f55\u65b9\u6cd5\u8017\u65f6<\/h5>\n<p><span class=\"token comment\">\/\/ 1. \u5b9a\u4e49\u88ab\u4ee3\u7406\u63a5\u53e3<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUserById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">saveUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span> user<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 2. \u5b9e\u73b0\u7c7b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserServiceImpl<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUserById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6a21\u62df\u8017\u65f6\u64cd\u4f5c<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Alice&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">saveUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">User<\/span> user<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4fdd\u5b58\u903b\u8f91<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 3. \u81ea\u5b9a\u4e49InvocationHandler&#xff08;\u76d1\u63a7\u5668&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MonitorHandler<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">InvocationHandler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> target<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MonitorHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> target<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>target <span class=\"token operator\">&#061;<\/span> target<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">invoke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> proxy<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Method<\/span> method<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Throwable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> startTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6267\u884c\u76ee\u6807\u65b9\u6cd5<\/span><br \/>\n            <span class=\"token class-name\">Object<\/span> result <span class=\"token operator\">&#061;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">invoke<\/span><span class=\"token punctuation\">(<\/span>target<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> cost <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Method: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; Cost: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> cost <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5982\u679c\u8017\u65f6&gt;200ms&#xff0c;\u8bb0\u5f55\u5230\u65e5\u5fd7<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cost <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u26a0\ufe0f \u6027\u80fd\u8b66\u544a&#xff01;\u65b9\u6cd5[&#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;]\u8017\u65f6\u8fc7\u957f&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 4. \u521b\u5efa\u4ee3\u7406\u5bf9\u8c61<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DynamicProxyDemo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">UserService<\/span> target <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserServiceImpl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">UserService<\/span> proxy <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token class-name\">Proxy<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newProxyInstance<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            target<span class=\"token punctuation\">.<\/span><span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getClassLoader<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            target<span class=\"token punctuation\">.<\/span><span class=\"token function\">getClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getInterfaces<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MonitorHandler<\/span><span class=\"token punctuation\">(<\/span>target<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u4ee3\u7406<\/span><br \/>\n        proxy<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUserById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">123<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;Method: getUserById Cost: 101ms<\/span><br \/>\n        proxy<span class=\"token punctuation\">.<\/span><span class=\"token function\">saveUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">456<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Bob&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;Method: saveUser Cost: 5ms<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 3&#xff1a;MonitorHandler\u5728\u65b9\u6cd5\u524d\u540e\u8bb0\u5f55\u8017\u65f6&#xff0c;\u5b9e\u73b0\u65e0\u4fb5\u5165\u5f0f\u76d1\u63a7\u3002<\/li>\n<li>Step 4&#xff1a;\u901a\u8fc7Proxy.newProxyInstance\u52a8\u6001\u751f\u6210\u4ee3\u7406\u7c7b\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>\u5347\u7ea7\u65b9\u6848&#xff1a;\u7528AspectJ\u5b9e\u73b0\u201c\u5168\u6808\u76d1\u63a7\u201d<\/h5>\n<p><span class=\"token comment\">\/\/ 5. AspectJ\u5207\u9762\u914d\u7f6e<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Aspect<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PerformanceAspect<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Around<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;execution(* com.example..*(..))&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">aroundAdvice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ProceedingJoinPoint<\/span> joinPoint<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Throwable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> startTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> joinPoint<span class=\"token punctuation\">.<\/span><span class=\"token function\">proceed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> cost <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> startTime<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Aspect: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> joinPoint<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSignature<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; Cost: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> cost <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 6. \u542f\u7528AspectJ&#xff08;\u9700\u914d\u7f6eaop.xml&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AspectConfig<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AspectJProxyFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">createProxy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7701\u7565\u5177\u4f53\u5b9e\u73b0<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 5&#xff1a;&#064;Around\u5207\u70b9\u5339\u914d\u6240\u6709\u65b9\u6cd5&#xff0c;\u5b9e\u73b0\u5168\u6808\u76d1\u63a7\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>&#x1f31f; \u795e\u56683&#xff1a;\u5b57\u8282\u7801\u63d2\u6869\u2014\u2014\u201c\u5916\u79d1\u624b\u672f\u5200\u201d\u7ea7\u8bca\u65ad<\/h4>\n<p>\u73b0\u8c61\u63cf\u8ff0&#xff1a;<br \/>\n\u60f3\u5728\u7f16\u8bd1\u540e\u201c\u5077\u5077\u4fee\u6539\u4ee3\u7801\u201d&#xff0c;\u4f46\u53c8\u4e0d\u60f3\u6539\u6e90\u7801&#xff1f;<\/p>\n<p>\u771f\u76f8\u63ed\u9732&#xff1a;<br \/>\n\u9700\u8981\u4e00\u4e2a\u201c\u5b57\u8282\u7801\u624b\u672f\u5200\u201d\u6765\u52a8\u6001\u4fee\u6539\u65b9\u6cd5&#xff01;<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<br \/>\nByteBuddy &#043; Java Agent<\/p>\n<hr \/>\n<h5>\u4ee3\u7801\u793a\u4f8b&#xff1a;\u7528Java Agent\u4fee\u6539\u65b9\u6cd5\u903b\u8f91<\/h5>\n<p><span class=\"token comment\">\/\/ 7. \u5b9a\u4e49Agent\u7c7b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyAgent<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">premain<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> args<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Instrumentation<\/span> inst<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        inst<span class=\"token punctuation\">.<\/span><span class=\"token function\">addTransformer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ClassFileTransformer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">transform<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ClassLoader<\/span> loader<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> className<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> classBeingRedefined<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ProtectionDomain<\/span> protectionDomain<span class=\"token punctuation\">,<\/span><br \/>\n                                   <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> classfileBuffer<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u76ee\u6807\u7c7b&#xff1a;com.example.service.UserService<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;com\/example\/service\/UserService&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>className<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u4f7f\u7528ByteBuddy\u4fee\u6539\u5b57\u8282\u7801<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ByteBuddy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">redefine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ClassReader<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">of<\/span><span class=\"token punctuation\">(<\/span>classfileBuffer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">named<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;getUserById&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">intercept<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MethodDelegation<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">to<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MyInterceptor<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">getBytes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 8. \u5b9a\u4e49\u62e6\u622a\u5668&#xff08;\u4fee\u6539\u65b9\u6cd5\u903b\u8f91&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MyInterceptor<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUserById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Interceptor: \u65b9\u6cd5\u88ab\u62e6\u622a&#xff01;ID&#061;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">User<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;InjectedAlice&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fd4\u56de\u4f2a\u9020\u6570\u636e<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 9. Agent\u542f\u52a8\u914d\u7f6e&#xff08;MANIFEST.MF&#xff09;<\/span><br \/>\n<span class=\"token class-name\">Premain<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token class-name\">Class<\/span><span class=\"token operator\">:<\/span> <span class=\"token class-name\">MyAgent<\/span><br \/>\n<span class=\"token class-name\">Can<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token class-name\">Redefine<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token class-name\">Classes<\/span><span class=\"token operator\">:<\/span> <span class=\"token boolean\">true<\/span><br \/>\n<span class=\"token class-name\">Can<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token class-name\">Retransform<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token class-name\">Classes<\/span><span class=\"token operator\">:<\/span> <span class=\"token boolean\">true<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 7&#xff1a;\u901a\u8fc7Instrumentation\u52a8\u6001\u4fee\u6539UserService\u7c7b\u7684getUserById\u65b9\u6cd5\u3002<\/li>\n<li>Step 8&#xff1a;MyInterceptor\u7528MethodDelegation\u52ab\u6301\u65b9\u6cd5\u6267\u884c\u903b\u8f91\u3002<\/li>\n<\/ul>\n<hr \/>\n<h5>\u7ec8\u6781\u65b9\u6848&#xff1a;\u7528ASM\u624b\u52a8\u64cd\u4f5c\u5b57\u8282\u7801<\/h5>\n<p><span class=\"token comment\">\/\/ 10. \u7528ASM\u4fee\u6539\u65b9\u6cd5\u5b57\u8282\u7801<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MethodPatcher<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token function\">patchClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> classBytes<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ClassReader<\/span> reader <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ClassReader<\/span><span class=\"token punctuation\">(<\/span>classBytes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ClassWriter<\/span> writer <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ClassWriter<\/span><span class=\"token punctuation\">(<\/span>reader<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ClassWriter<\/span><span class=\"token punctuation\">.<\/span>COMPUTE_FRAMES<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ClassVisitor<\/span> visitor <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ClassVisitor<\/span><span class=\"token punctuation\">(<\/span>ASM9<span class=\"token punctuation\">,<\/span> writer<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MethodVisitor<\/span> <span class=\"token function\">visitMethod<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> access<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> descriptor<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> signature<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> exceptions<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">MethodVisitor<\/span> mv <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">visitMethod<\/span><span class=\"token punctuation\">(<\/span>access<span class=\"token punctuation\">,<\/span> name<span class=\"token punctuation\">,<\/span> descriptor<span class=\"token punctuation\">,<\/span> signature<span class=\"token punctuation\">,<\/span> exceptions<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;getUserById&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MethodVisitor<\/span><span class=\"token punctuation\">(<\/span>ASM9<span class=\"token punctuation\">,<\/span> mv<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n                        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">visitCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">visitCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token comment\">\/\/ \u63d2\u5165\u65e5\u5fd7\u8f93\u51fa<\/span><br \/>\n                            mv<span class=\"token punctuation\">.<\/span><span class=\"token function\">visitMethodInsn<\/span><span class=\"token punctuation\">(<\/span>INVOKESTATIC<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;java\/lang\/System&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;out&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Ljava\/io\/PrintStream;&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            mv<span class=\"token punctuation\">.<\/span><span class=\"token function\">visitLdcInsn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ASM: \u65b9\u6cd5\u5f00\u59cb\u6267\u884c&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            mv<span class=\"token punctuation\">.<\/span><span class=\"token function\">visitMethodInsn<\/span><span class=\"token punctuation\">(<\/span>INVOKEVIRTUAL<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;java\/io\/PrintStream&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;println&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;(Ljava\/lang\/String;)V&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> mv<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        reader<span class=\"token punctuation\">.<\/span><span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>visitor<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ClassReader<\/span><span class=\"token punctuation\">.<\/span>EXPAND_FRAMES<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> writer<span class=\"token punctuation\">.<\/span><span class=\"token function\">toByteArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 10&#xff1a;\u901a\u8fc7ASM\u6846\u67b6\u624b\u52a8\u63d2\u5165\u65e5\u5fd7\u8bed\u53e5\u5230\u76ee\u6807\u65b9\u6cd5\u5f00\u5934\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>&#x1f9ea; \u5b9e\u6218\u6848\u4f8b&#xff1a;\u7535\u5546\u7cfb\u7edf\u7684\u201c\u6027\u80fd\u6025\u6551\u201d<\/h4>\n<p>\u76ee\u6807&#xff1a;<br \/>\n\u5b9a\u4f4d\u8ba2\u5355\u670d\u52a1\u7684\u201c\u795e\u79d8\u8d85\u65f6\u201d\u95ee\u9898\u3002<\/p>\n<hr \/>\n<h5>\u6b65\u9aa41&#xff1a;\u7528Arthas\u5b9a\u4f4d\u6162\u65b9\u6cd5<\/h5>\n<p><span class=\"token comment\"># 11. \u76d1\u63a7\u8ba2\u5355\u670d\u52a1\u7684\u4e0b\u5355\u65b9\u6cd5<\/span><br \/>\narthas&#064;xxx<span class=\"token operator\">&gt;<\/span> <span class=\"token function\">watch<\/span> com.example.service.OrderService placeOrder <span class=\"token string\">&#039;{params, returnObj, #cost}&#039;<\/span> -x <span class=\"token number\">2<\/span> -n <span class=\"token number\">5<\/span><br \/>\n<span class=\"token comment\"># \u8f93\u51fa\u793a\u4f8b&#xff1a;<\/span><br \/>\nMethod: placeOrder<br \/>\nParameters: <span class=\"token punctuation\">[<\/span>Order<span class=\"token punctuation\">(<\/span>id<span class=\"token operator\">&#061;<\/span><span class=\"token number\">123<\/span>, <span class=\"token assign-left variable\">productId<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">456<\/span>, <span class=\"token assign-left variable\">quantity<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\nReturn: <span class=\"token string\">&#034;\u4e0b\u5355\u6210\u529f&#034;<\/span><br \/>\nCost Time: <span class=\"token number\">1500<\/span> ms <span class=\"token punctuation\">(<\/span>\u8d85\u65f6&#xff01;<span class=\"token punctuation\">)<\/span><\/p>\n<h5>\u6b65\u9aa42&#xff1a;\u7528\u52a8\u6001\u4ee3\u7406\u8bb0\u5f55\u8c03\u7528\u94fe<\/h5>\n<p><span class=\"token comment\">\/\/ 12. \u5728\u4ee3\u7406\u4e2d\u8bb0\u5f55\u8c03\u7528\u94fe<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TraceHandler<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">InvocationHandler<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> target<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">TraceHandler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> target<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>target <span class=\"token operator\">&#061;<\/span> target<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">invoke<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> proxy<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Method<\/span> method<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Throwable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> traceId <span class=\"token operator\">&#061;<\/span> UUID<span class=\"token punctuation\">.<\/span><span class=\"token function\">randomUUID<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;TRACE: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> traceId <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; -&gt; &#034;<\/span> <span class=\"token operator\">&#043;<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> method<span class=\"token punctuation\">.<\/span><span class=\"token function\">invoke<\/span><span class=\"token punctuation\">(<\/span>target<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;TRACE END: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> traceId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 12&#xff1a;\u901a\u8fc7traceId\u8ffd\u8e2a\u65b9\u6cd5\u8c03\u7528\u94fe\u8def&#xff0c;\u5b9a\u4f4d\u8d85\u65f6\u73af\u8282\u3002<\/li>\n<\/ul>\n<h5>\u6b65\u9aa43&#xff1a;\u7528Java Agent\u4fee\u6539\u652f\u4ed8\u7f51\u5173\u903b\u8f91<\/h5>\n<p><span class=\"token comment\">\/\/ 13. \u62e6\u622a\u652f\u4ed8\u7f51\u5173\u65b9\u6cd5<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PaymentInterceptor<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">processPayment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Interceptor: \u62e6\u622a\u652f\u4ed8\u8c03\u7528&#xff0c;\u91d1\u989d&#061;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6a21\u62df\u652f\u4ed8\u6210\u529f<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u91ca\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>Step 13&#xff1a;\u901a\u8fc7Agent\u4fee\u6539\u652f\u4ed8\u7f51\u5173\u903b\u8f91&#xff0c;\u5feb\u901f\u9a8c\u8bc1\u662f\u5426\u56e0\u7b2c\u4e09\u65b9\u63a5\u53e3\u8d85\u65f6\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>\u26a1 \u8fdb\u9636\u6280\u5de7&#xff1a;\u52a8\u6001\u5206\u6790\u7684\u201c\u9690\u85cf\u8d85\u80fd\u529b\u201d<\/h4>\n<hr \/>\n<h5>\u6280\u5de71&#xff1a;\u7ed3\u5408\u65e5\u5fd7\u6846\u67b6\u5b9e\u73b0\u201c\u6761\u4ef6\u65e5\u5fd7\u201d<\/h5>\n<p><span class=\"token comment\">\/\/ 14. \u52a8\u6001\u5f00\u542fDEBUG\u65e5\u5fd7<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoggingAspect<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Around<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;execution(* *(..)) &amp;&amp; args(userId)&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">logAround<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ProceedingJoinPoint<\/span> joinPoint<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> userId<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">Throwable<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>userId <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">123<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u4ec5\u5bf9\u7279\u5b9a\u7528\u6237\u5f00\u542fDEBUG\u65e5\u5fd7<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;DEBUG: \u7528\u6237123\u7684\u8bf7\u6c42\u88ab\u76d1\u63a7&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> joinPoint<span class=\"token punctuation\">.<\/span><span class=\"token function\">proceed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h5>\u6280\u5de72&#xff1a;\u7528Groovy\u811a\u672c\u5b9e\u73b0\u201c\u70ed\u66f4\u65b0\u201d<\/h5>\n<p><span class=\"token comment\">\/\/ 15. 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