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37 lines (28 loc) · 771 Bytes
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package agent;
import java.lang.instrument.Instrumentation;
public class MyAgent
{
/**
* 该方法在main方法之前运行，与main方法运行在同一个JVM中 并被同一个System ClassLoader装载
* 被统一的安全策略(security policy)和上下文(context)管理
*/
public static void premain(String agentOps, Instrumentation inst)
{
System.out.println("=========premain方法执行========");
System.out.println(agentOps);
// 添加Transformer
inst.addTransformer(new MyTransformer());
}
/**
* 如果不存在 premain(String agentOps, Instrumentation inst) 则会执行 premain(String
* agentOps)
*/
public static void premain(String agentOps)
{
System.out.println("====premain方法执行2====");
System.out.println(agentOps);
}
public static void main(String[] args)
{
}
}