byte-buddy使用demo，无代码侵入的方式，监控记录函数方法运行时间

package org.monitor; import net.bytebuddy.agent.builder.AgentBuilder; import net.bytebuddy.description.method.MethodDescription; import net.bytebuddy.description.type.TypeDescription; import net.bytebuddy.dynamic.DynamicType; import net.bytebuddy.implementation.MethodDelegation; import net.bytebuddy.matcher.ElementMatchers; import net.bytebuddy.utility.JavaModule; import java.lang.instrument.Instrumentation; public class MonitorAgent { public static void premain(String agentParam, Instrumentation inst) { System.out.println("premain监控开始--------->包路径：" + agentParam); // method指定哪些方法需要被拦截，ElementMathers.any指定了所有的方法，声明intercept拦截器 AgentBuilder.Transformer transformer = new AgentBuilder.Transformer() { @Override public DynamicType.Builder<?> transform(DynamicType.Builder<?> builder, TypeDescription typeDescription, ClassLoader classLoader, JavaModule javaModule) { return builder.method(ElementMatchers.<MethodDescription>any()) .intercept(MethodDelegation.to(MonitorIntercept.class)); } }; /** * 1.type指定了agent拦截的包名，以[com.monitor]作为前缀 * 2.指定了转换器transformer * 3.将配置安装到Instrumentation */ new AgentBuilder.Default() .type(ElementMatchers.<TypeDescription>nameStartsWith(agentParam)) .transform(transformer) .installOn(inst); } }