本文格式為Word版，下載可任意編輯——JAVA的動(dòng)態(tài)代理分析JAVA的動(dòng)態(tài)代理分析

引導(dǎo)語(yǔ)：在使用動(dòng)態(tài)代理類時(shí)，我們務(wù)必實(shí)現(xiàn)InvocationHandler接口,以下是我共享給大家的JAVA動(dòng)態(tài)代理，接待閱讀了解!

1，被代理類的接口Proxied

Java代碼

packageTest1;

//被代理類需實(shí)現(xiàn)的'接口

publicinterfaceProxied

voiddoSomething;

voiddoSomethingElseStringstr;

2，一個(gè)Proxied接口的實(shí)現(xiàn)類被代理類

Java代碼

packageTest1;

publicclassConcreteProxiedimplementsProxied

@Override

publicvoiddoSomething

try

Thread.sleep100;

catchInterruptedExceptione

System.err.printlnError:InterruptedException;

System.out.printlnthis.getClass.getSimpleName

+doSomething.;

@Override

publicvoiddoSomethingElseStringstr

try

Thread.sleep150;

catchInterruptedExceptione

System.err.printlnError:InterruptedException;

System.out.printlnthis.getClass.getSimpleName

+doSomethingElse,argument=+str+.;

3，TimingInvocationHandler類，實(shí)現(xiàn)了InvocationHandler接口

Java代碼

packageTest1;

importjava.lang.reflect.InvocationHandler;

importjava.lang.reflect.Method;

publicclassTimeingInvocationHandlerimplementsInvocationHandler

//被代理的對(duì)象

privateObjectproxied;

publicTimeingInvocationHandlerObjectproxied

xied=proxied;

//參數(shù)proxy表示代理類的對(duì)象

//參數(shù)method表示被代理類和代理類都實(shí)現(xiàn)的接口的方法對(duì)象

//參數(shù)args表示方法method的參數(shù)數(shù)組

@Override

publicObjectinvokeObjectproxy,Methodmethod,Object[]args

throwsThrowable

System.out.printlnmethod.getDeclaringClass.getName;

longcurrentTimeMillis=System.currentTimeMillis;

Objectret=method.invokeproxied,args;

System.out.printlnthis.getClass.getSimpleName+wastestime:

+System.currentTimeMillis-currentTimeMillis+ms;

returnret;

4，測(cè)試類Test

Java代碼

packageTest1;

importjava.lang.reflect.Proxy;

publicclassTestProxy

publicstaticvoidmainString[]args

Proxiedproxied=newConcreteProxied;

proxied.doSomething;

proxied.doSomethingElseonlyaString;

//生成一個(gè)代理實(shí)例，這個(gè)代理實(shí)現(xiàn)了Proxied接口

//對(duì)這個(gè)代理proxy的方法的調(diào)用會(huì)重定向到TimeingInvocationHandler的invoke方法

Proxiedproxy=ProxiedProxy.newProxyInstanceProxied.class

.getClassLoader,//類加載器

newClass[]Proxied.class,//代理要實(shí)現(xiàn)的接口

newTimeingInvocationHandlerproxied//調(diào)用處理器

;

proxy.doSomething;

proxy.doSomethingElseonlyaString;

運(yùn)行Test類，輸出如下：

ConcreteProxieddoSomething.

ConcreteProxieddoSomethingElse,argument=onlyaString.

Test1.Proxied

ConcreteProxieddoSomething.

TimeingInvocationHandlerwastestime:110