commit
4ef7145148
@ -0,0 +1,17 @@
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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>com.seele</groupId>
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<artifactId>demo</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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</project>
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@ -0,0 +1,29 @@
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package com.seele;
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public class Main {
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public int print(int i) {
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System.out.println("i: " + i);
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try {
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Thread.sleep(1000);
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}catch (InterruptedException e){
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e.printStackTrace();
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}
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return i + 2;
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}
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public void run(){
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int i = new Trans().getNumber();
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while (i < 1000){
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try{
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i = print(i);
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}catch (Exception e){
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e.printStackTrace();
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}
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}
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}
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public static void main(String[] args) {
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Main main = new Main();
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main.run();
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}
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}
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@ -0,0 +1,7 @@
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package com.seele;
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public class Trans {
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public int getNumber() {
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return 1;
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}
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}
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@ -0,0 +1,56 @@
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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>com.seele</groupId>
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<artifactId>simple_agent</artifactId>
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<version>1.0</version>
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||||
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<properties>
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||||
<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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||||
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||||
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||||
<build>
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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-assembly-plugin</artifactId>
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<configuration>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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||||
</descriptorRefs>
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||||
<archive>
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||||
<!-- <manifest>-->
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<!-- <addClasspath>true</addClasspath>-->
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||||
<!-- </manifest>-->
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||||
<manifestEntries>
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||||
<Built-By>neo</Built-By>
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||||
<Premain-Class>com.seele.SimpleAgent</Premain-Class>
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<Agent-Class>com.seele.SimpleAgent</Agent-Class>
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||||
<!-- <Main-Class>com.janetfilter.core.Launcher</Main-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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||||
<!-- <Can-Set-Native-Method-Prefix>true</Can-Set-Native-Method-Prefix>-->
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||||
</manifestEntries>
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||||
</archive>
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||||
</configuration>
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||||
<executions>
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<execution>
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||||
<id>make-assembly</id>
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||||
<phase>package</phase>
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<goals>
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||||
<goal>single</goal>
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||||
</goals>
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||||
</execution>
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||||
</executions>
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||||
</plugin>
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||||
</plugins>
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||||
</build>
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||||
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||||
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</project>
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@ -0,0 +1,16 @@
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||||
package com.seele;
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||||
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||||
import com.sun.tools.attach.AgentInitializationException;
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import com.sun.tools.attach.AgentLoadException;
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||||
import com.sun.tools.attach.AttachNotSupportedException;
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import com.sun.tools.attach.VirtualMachine;
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||||
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||||
import java.io.IOException;
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||||
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||||
public class AttachMain {
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||||
|
||||
public static void main(String[] args) throws IOException, AttachNotSupportedException, AgentLoadException, AgentInitializationException {
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||||
VirtualMachine vm = VirtualMachine.attach("15168");
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||||
vm.loadAgent("D:\\Code\\learn\\java_agent\\simple_agent\\target\\simple_agent-1.0-jar-with-dependencies.jar");
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||||
}
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||||
}
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||||
@ -0,0 +1,28 @@
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||||
package com.seele;
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||||
|
||||
import java.lang.instrument.Instrumentation;
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||||
|
||||
public class SimpleAgent {
|
||||
|
||||
/**
|
||||
* jvm 参数形式
|
||||
*
|
||||
* @param agentArgs
|
||||
* @param inst
|
||||
*/
|
||||
public static void premain(String agentArgs, Instrumentation inst) {
|
||||
System.out.println("premain");
|
||||
inst.addTransformer(new Transformer());
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||||
}
|
||||
|
||||
/**
|
||||
* attach 方式形式
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||||
*
|
||||
* @param agentArgs
|
||||
* @param inst
|
||||
*/
|
||||
public static void agentmain(String agentArgs, Instrumentation inst) {
|
||||
System.out.println("agentmain");
|
||||
}
|
||||
|
||||
}
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||||
Binary file not shown.
@ -0,0 +1,46 @@
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||||
package com.seele;
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||||
|
||||
import java.io.*;
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||||
import java.lang.instrument.ClassFileTransformer;
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||||
import java.lang.instrument.IllegalClassFormatException;
|
||||
import java.security.ProtectionDomain;
|
||||
|
||||
public class Transformer implements ClassFileTransformer {
|
||||
|
||||
private static String classNumberReturn2 = "D:\\Code\\learn\\java_agent\\simple_agent\\src\\main\\java\\com\\seele\\Trans.class";
|
||||
|
||||
private static byte[] getBytesFromFile(String filename) {
|
||||
try {
|
||||
File file = new File(filename);
|
||||
InputStream is = new FileInputStream(file);
|
||||
long length = file.length();
|
||||
byte[] bytes = new byte[(int) length];
|
||||
|
||||
int offset = 0;
|
||||
int numRead = 0;
|
||||
while (offset < bytes.length && (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
|
||||
offset += numRead;
|
||||
}
|
||||
|
||||
if (offset < bytes.length) {
|
||||
throw new IOException("Could not completely read file." + filename);
|
||||
}
|
||||
is.close();
|
||||
return bytes;
|
||||
} catch (FileNotFoundException e) {
|
||||
throw new RuntimeException(e);
|
||||
} catch (IOException e) {
|
||||
throw new RuntimeException(e);
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public byte[] transform(ClassLoader loader, String className,
|
||||
Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer)
|
||||
throws IllegalClassFormatException {
|
||||
if (!className.equals("com/seele/Trans")) {
|
||||
return ClassFileTransformer.super.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
|
||||
}
|
||||
return getBytesFromFile(classNumberReturn2);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in new issue