javaAgent实现补丁不重出功能，通过attach实现程序运行时加载，同时通过shell脚本部署到容器内

package com.sk.service; import javassist.*; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.lang.instrument.ClassDefinition; import java.lang.instrument.ClassFileTransformer; import java.lang.instrument.IllegalClassFormatException; import java.lang.instrument.Instrumentation; import java.security.ProtectionDomain; public class FirstAgent02 { public static void premain(String agentArgs, Instrumentation inst){ System.out.println("1-----FirstAgent is Start."); inst.addTransformer(new FirstTransformer()); } public static void agentmain(String args, Instrumentation ins) { System.out.println("2-----FirstAgent is Start."); ins.addTransformer(new ClassFileTransformer() { /** * @param loader * @param className 动态加载的类名 * @param classBeingRedefined 这个类重新加载之前的类 * @param protectionDomain 类的基本信息 * @param classfileBuffer 这个类的字节码，如果返回null就按照原有的进行加载覆盖 * @return 返回指令码 * @throws IllegalClassFormatException */ @Override public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException { System.out.println("-=======+++++++++++++++++++++++++++"+className); /*if (!"javaagent/HelloWorld".equals(className)) { return null; } // 配合javassist修改指令码 ClassPool pool = new ClassPool(); pool.appendSystemPath(); try { CtClass ctClass = pool.get("javaagent.HelloWorld"); CtMethod method = ctClass.getDeclaredMethod("hello"); method.insertBefore("System.out.println(\"插入前置逻辑2\");"); return ctClass.toBytecode(); } catch (NotFoundException | CannotCompileException | IOException e) { e.printStackTrace(); }*/ return null; } }); } public static void agentmain(String args) { System.out.println("-----attach-----00----"+args); } }