wms / wms-cloud-server · Files

package com.huaheng.gateway.config;

import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.security.ProtectionDomain;

public class PremainTest {

    public static void premain(String agentArgs, Instrumentation inst) {
        System.out.println("agentArgs : " + agentArgs);
        // 可以通过实现ClassFileTransformer来完成我们所希望的类字节码转换
        inst.addTransformer(new ClassFileTransformer() {
            @Override
            public byte[] transform(ClassLoader loader, String className, Class<?> classBeingRedefined,
                                    ProtectionDomain protectionDomain, byte[] classfileBuffer)
                    throws IllegalClassFormatException {
                System.out.println("premain load Class     :" + className);
                return classfileBuffer;
            }
        }, true);

    }
}