Cglib 与 JDK动态代理的运行性能对比

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都说Cglib创立的动态代理的运行性能比JDK动态代理能高出大约10倍，今日抱着怀疑精神验证了一下，发现状况有所不同，遂贴出试验结果，以供参考和探讨。代码很简单，首先，定义一个Test接口，和一个实现TestImpl。Test接口仅定义一个方法test，对传入的int参数加1后返回。代码如下：

packagemy.test;

publicinterfaceTest{

publicinttest(inti);}

packagemy.test;

publicclassTestImplimplementsTest{publicinttest(inti){returni+1;}}

然后，定义了三种代理的实现：装饰者模式实现的代理(decorator)，JDK动态代理(dynamicproxy)和Cglib动态代理(cglibproxy)。代码如下：

packagemy.test;

publicclassDecoratorTestimplementsTest{privateTesttarget;

publicDecoratorTest(Testtarget){this.target=target;}

publicinttest(inti){returntarget.test(i);}}

packagemy.test;

importjava.lang.reflect.InvocationHandler;importjava.lang.reflect.Method;importjava.lang.reflect.Proxy;

publicclassDynamicProxyTestimplementsInvocationHandler{privateTesttarget;

privateDynamicProxyTest(Testtarget){this.target=target;}

publicstaticTestnewProxyInstance(Testtarget){return(Test)Proxy.newProxyInstance(DynamicProxyTest.class.getClassLoader(),newClass[]{Test.class},newDynamicProxyTest(target));

}

publicObjectinvoke(Objectproxy,Methodmethod,Object[]args)

throwsThrowable{

returnmethod.invoke(target,args);}}

packagemy.test;

importjava.lang.reflect.Method;

xy.Enhancer;

xy.MethodInterceptor;xy.MethodProxy;

publicclassCglibProxyTestimplementsMethodInterceptor{

privateCglibProxyTest(){}

publicstaticTestnewProxyInstance(ClasstargetInstanceClazz){Enhancerenhancer=newEnhancer();enhancer.setSuperclass(targetInstanceClazz);enhancer.setCallback(newCglibProxyTest());return(Test)enhancer.create();}

publicObjectintercept(Objectobj,Methodmethod,Object[]args,MethodProxyproxy)throwsThrowable{returnproxy.invokeSuper(obj,args);}}

以TestImpl的调用耗时作为基准，对比通过其它三种代理进行调用的耗时。测试代码如下：

packagemy.test;

importjava.util.LinkedHashMap;importjava.util.Map;

publicclassProxyPerfTester{

publicstaticvoidmain(String[]args){//创立测试对象；

TestnativeTest=newTestImpl();

Testdecorator=newDecoratorTest(nativeTest);

TestdynamicProxy=DynamicProxyTest.newProxyInstance(nativeTest);TestcglibProxy=CglibProxyTest.newProxyInstance(TestImpl.class);

//预热一下；

intpreRunCount=10000;

runWithoutMonitor(nativeTest,preRunCount);runWithoutMonitor(decorator,preRunCount);runWithoutMonitor(cglibProxy,preRunCount);runWithoutMonitor(dynamicProxy,preRunCount);

//执行测试；

Maptests=newLinkedHashMap();tests.put(\\nativeTest);tests.put(\decorator);

tests.put(\\dynamicProxy);tests.put(\\cglibProxy);intrepeatCount=3;

intrunCount=1000000;

runTest(repeatCount,runCount,tests);runCount=50000000;

runTest(repeatCount,runCount,tests);}

privatestaticvoidrunTest(intrepeatCount,intrunCount,Maptests){