Spring api之手动创建代理对象ProxyFactory

可以通过注解的方式来自定义代理对象的创建，同时也可以通过 SpringAPI，手动编程的方式来创建代理对象。

几个重要的API：

ProxyFactory

MethodInterceptor

Advice

AfterReturningAdvice

MethodBeforeAdvice

import java.lang.reflect.Method;

import org.aopalliance.intercept.Interceptor;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

import org.junit.Test;

import org.springframework.aop.AfterAdvice;

import org.springframework.aop.AfterReturningAdvice;

import org.springframework.aop.MethodBeforeAdvice;

import org.springframework.aop.framework.ProxyFactory;

import cn.hessian.service.HelloWorldService;

import cn.hessian.service.impl.HelloWorldServiceImpl2;

/**

* @author beijing

* 2013-4-2

*/

public class SpringProgramicProxyDemo {

@Test

public void test(){

//代理对象需要的实现的接口

Class[] interfaces=new Class[]{HelloWorldService.class};

//利用spring的API,创建代理工厂

ProxyFactory proxyFactory=new ProxyFactory(interfaces);

//设置目标对象

proxyFactory.setTarget(new HelloWorldServiceImpl());

/**

* Set whether proxies created by this configuration should be prevented from being cast to Advised to query proxy status.

Default is "false", meaning that any AOP proxy can be cast to Advised.

* */

proxyFactory.setOpaque(true);

//添加方法前置通知

proxyFactory.addAdvice(new MethodBeforeAdvice() {

@Override

public void before(Method method, Object[] args, Object target)

throws Throwable {

System.out.println("1---在方法调用之前拦截");

}

});

//可以添加多个方法前置或者后置通知

proxyFactory.addAdvice(new MethodBeforeAdvice() {

@Override

public void before(Method method, Object[] args, Object target)

throws Throwable {

System.out.println("2---在方法调用之前拦截");

}

});

//可以添加多个方法前置或者后置通知

proxyFactory.addAdvice(new AfterReturningAdvice() {

@Override

public void afterReturning(Object returnValue, Method method,

Object[] args, Object target) throws Throwable {

System.out.println("方法完成之后调用的方法---1");

}

});

//可以添加多个方法前置或者后置通知

proxyFactory.addAdvice(new AfterReturningAdvice() {

@Override

public void afterReturning(Object returnValue, Method method,

Object[] args, Object target) throws Throwable {

System.out.println("方法完成之后调用的方法---2");

}

});

//对于环绕通知只能添加一个,多添加也是没有用的，spring会选第一个advice，请看结果

proxyFactory.addAdvice(new MethodInterceptor() {

@Override

public Object invoke(MethodInvocation invocation) throws Throwable {

System.out.println("1---环绕通知");

Object[] params=invocation.getArguments();

Method method=invocation.getMethod();

Object target=invocation.getThis();

Object bytes=method.invoke(target, params);

byte[] result=(byte[]) bytes;

System.out.println("1---环绕通知生成的结果："+new String(result));

return "北京生活圈".getBytes();

}

});

//对于环绕通知只能添加一个,多添加也是没有用的，spring会选第一个advice，请看结果

proxyFactory.addAdvice(new MethodInterceptor() {

@Override

public Object invoke(MethodInvocation invocation) throws Throwable {

System.out.println("2---环绕通知");

Object[] params=invocation.getArguments();

Method method=invocation.getMethod();

Object target=invocation.getThis();

Object bytes=method.invoke(target, params);

byte[] result=(byte[]) bytes;

System.out.println("2---环绕通知生成的结果："+new String(result));

return bytes;

}

});

Object proxy=proxyFactory.getProxy(proxyFactory.getClass().getClassLoader());

Class[] inters=proxy.getClass().getInterfaces();

for(Class str: inters ){

System.out.println(str.getSimpleName());

}

HelloWorldService helloWorldService=(HelloWorldService)proxy;

System.out.println(new String(helloWorldService.sayHelloWorld("北京")));

}

}

结果：

自己动手丰衣足食~~~~