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‎6.JavaAgent/AgentMain/code/AgentMainTest/.idea/.gitignore‎

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‎6.JavaAgent/AgentMain/code/AgentMainTest/.idea/compiler.xml‎

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‎6.JavaAgent/AgentMain/code/AgentMainTest/.idea/jarRepositories.xml‎

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‎6.JavaAgent/AgentMain/code/AgentMainTest/.idea/libraries/testJar.xml‎

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‎6.JavaAgent/AgentMain/code/AgentMainTest/.idea/misc.xml‎

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‎6.JavaAgent/AgentMain/code/AgentMainTest/.idea/uiDesigner.xml‎

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‎6.JavaAgent/AgentMain/code/AgentMainTest/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>AgentMainTest</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<properties>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.sunn</groupId>
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<artifactId>tools</artifactId>
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<version>1.8.0</version>
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<scope>system</scope>
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<systemPath>D:/JDKV/jdk8u301/lib/tools.jar</systemPath>
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</dependency>
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<dependency>
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<groupId>org.javassist</groupId>
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<artifactId>javassist</artifactId>
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<version>3.21.0-GA</version>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>2.2</version>
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<configuration>
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<archive>
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<manifestEntries>
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<!--改这个为代理类-->
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<Agent-Class>AgentMain</Agent-Class>
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<Can-Redefine-Classes>true</Can-Redefine-Classes>
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<Can-Retransform-Classes>true</Can-Retransform-Classes>
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</manifestEntries>
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</archive>
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<skip>true</skip>
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</configuration>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>

‎6.JavaAgent/AgentMain/code/AgentMainTest/src/main/java/AgentMain.java‎

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import java.lang.instrument.ClassDefinition;
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import java.lang.instrument.Instrumentation;
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import java.lang.instrument.UnmodifiableClassException;
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public class AgentMain {
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public static void agentmain(String agentArgs, Instrumentation inst) throws ClassNotFoundException, UnmodifiableClassException, InterruptedException {
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inst.addTransformer(new Transformer (), true);
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Class[] loadedClass = inst.getAllLoadedClasses();
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for (Class clazz : loadedClass){
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String className = clazz.getName();
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if (inst.isModifiableClass(clazz)){
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if (className.equals("TransClass")){
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try {
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inst.retransformClasses(clazz);
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} catch (UnmodifiableClassException e) {
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e.printStackTrace();
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}
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}
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}
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}
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}
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}

‎6.JavaAgent/AgentMain/code/AgentMainTest/src/main/java/AttachTest.java‎

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import com.sun.tools.attach.VirtualMachine;
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import com.sun.tools.attach.VirtualMachineDescriptor;
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import java.util.List;
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public class AttachTest {
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// 一个运行 Attach API 的线程子类
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// 每隔半秒时间检查一次所有的 Java 虚拟机
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static class AttachThread extends Thread {
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private final List<VirtualMachineDescriptor> listBefore;
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private final String jar;
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AttachThread(String attachJar, List<VirtualMachineDescriptor> vms) {
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listBefore = vms; // 记录程序启动时的 VM 集合
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jar = attachJar;
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}
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public void run() {
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VirtualMachine vm = null;
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List<VirtualMachineDescriptor> listAfter = null;
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try {
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int count = 0;
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while (true) {
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listAfter = VirtualMachine.list();
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for (VirtualMachineDescriptor vmd : listAfter) {
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if (vmd.displayName().equals("Test")) {
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System.out.println("进程ID：" + vmd.id() + "，进程名称：" + vmd.displayName());
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System.out.println("捕捉到Test进程，准备Hook");
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vm = VirtualMachine.attach(vmd.id());
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break;
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}
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}
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Thread.sleep(500);
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count++;
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if (null != vm || count >= 10) {
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break;
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}
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}
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vm.loadAgent(jar);
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vm.detach();
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} catch (Exception e) {
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}
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}
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}
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public static void main(String[] args) throws InterruptedException {
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new AttachThread("E:\\AgentMainTest\\target\\AgentMainTest-1.0-SNAPSHOT.jar", VirtualMachine.list()).start();
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}
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}

‎6.JavaAgent/AgentMain/code/AgentMainTest/src/main/java/Test.java‎

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// 程序每隔半秒钟输出一次返回值（显示出返回值从 1 变成 2）
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public class Test {
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public static void main(String[] args) throws InterruptedException {
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System.out.println(new TransClass().getNumber());
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int count = 0;
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while (true) {
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Thread.sleep(500);
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count++;
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int number = new TransClass().getNumber();
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System.out.println(number);
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if (3 == number || count >= 10) {
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break;
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}
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}
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}
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}

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