SpringAPI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

直接粘贴代码，代码能说明一切：

/**
*
*/
package cn.hessian.proxy;

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 HelloWorldServiceImpl2());
        /**
         * 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("1111111111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("22222222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11111");
               
            }
        });
       
       //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22222");
               
            }
        });
     

  //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("1111111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("1111111111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("22222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("222222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")));
    }
}

 

生成的结果为:

HelloWorldService
SpringProxy
1111111111在方法调用之前拦截
22222222在方法调用之前拦截
1111111环绕通知
1111111111环绕通知生成的结果--你好 北京
方法完成之后调用的方法22222
方法完成之后调用的方法11111
北京生活圈