1.sc:查看 JVM 已加载的类信息
sc com.lyb.web.mySpringBoot.demo.RedefineTestSimple sc com.lyb.web.mySpringBoot.demo.RedefineTestSimple -d
2.sm:查看已加载类的方法信息
sm com.lyb.web.mySpringBoot.demo.RedefineTestSimple sm com.lyb.web.mySpringBoot.demo.RedefineTestSimple -d
3.jad:反编译指定已加载类的源码
jad --source-only com.lyb.web.mySpringBoot.demo.RedefineTestSimple
保存源码到
/Users/liyabin/projectCode/test/RedefineTestSimple.java
jad --source-only com.lyb.web.mySpringBoot.demo.RedefineTestSimple > /Users/liyabin/projectCode/test/RedefineTestSimple.java
修改源码如下：添加一行日志
4.mc:Memory Compiler/内存编译器，编译.java文件生成.class
编译ThreadAppendData.java为字节码文件，存放到/Users/liyabin/projectCode/test目录下
mc /Users/liyabin/projectCode/test/RedefineTestSimple.java -d /Users/liyabin/projectCode/test
5.redefine:加载外部的.class文件，redefine jvm 已加载的类。
redefine /Users/liyabin/projectCode/test/com/lyb/web/mySpringBoot/demo/RedefineTestSimple.class
收到添加的代码生效：
恢复原始代码
redefine /Users/liyabin/projectCode/my-spring-boot/mySpringBoot-web/target/classes/com/lyb/web/mySpringBoot/demo/RedefineTestSimple.class
6.dump:dump 已加载类的 bytecode 到特定目录
dump -d /Users/liyabin/projectCode/test com.lyb.web.mySpringBoot.demo.RedefineTestSimple
7.classloader:查看 classloader 的继承树，urls，类加载信息
classloader classloader -l classloader -c 1b68b9a4
标签：web,redefine,lyb,mySpringBoot,dump,demo,classloader,RedefineTestSimple From： https://www.cnblogs.com/fycn01/p/16583876.html