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可以通過注解的方式來自定義代理對象的創(chuàng)建，同時也可以通過SpringAPI，手動編程的方式來創(chuàng)建代理對象。

幾個重要的API：

ProxyFactory\MethodInterceptor\Advice\AfterReturningAdvice\MethodBeforeAdvice

直接粘貼代碼，代碼能說明一切：

---

/**
*
*/
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(){
??????? //代理對象需要的實現的接口
??????? Class[] interfaces=new Class[]{HelloWorldService.class};
??????? //利用spring的API,創(chuàng)建代理工廠
??????? ProxyFactory proxyFactory=new ProxyFactory(interfaces);
??????? //設置目標對象
??????? 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在方法調用之前攔截");
??????????? }
??????? });
??????? //可以添加多個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在方法調用之前攔截");
??????????? }
??????? });
?? //可以添加多個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("方法完成之后調用的方法11111");
???????????????
??????????? }
??????? });
???????
?????? //可以添加多個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("方法完成之后調用的方法22222");
???????????????
??????????? }
??????? });
?????

? //對于環(huán)繞通知只能添加一個,多添加也是沒有用的，spring會選第一個advice，請看結果

??????? proxyFactory.addAdvice(new MethodInterceptor() {
???????????
??????????? @Override
??????????? public Object invoke(MethodInvocation invocation) throws Throwable {
??????????????? System.out.println("1111111環(huán)繞通知");
??????????????? 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環(huán)繞通知生成的結果--"+new String(result));
??????????????? return "北京生活圈".getBytes();
??????????? }
??????? });
???????
?????? //對于環(huán)繞通知只能添加一個,多添加也是沒有用的，spring會選第一個advice，請看結果
proxyFactory.addAdvice(new MethodInterceptor() {
???????????
??????????? @Override
??????????? public Object invoke(MethodInvocation invocation) throws Throwable {
??????????????? System.out.println("22222環(huán)繞通知");
??????????????? 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環(huán)繞通知生成的結果--"+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")));
??? }
}

?

---

---

生成的結果為:

HelloWorldService
SpringProxy
1111111111在方法調用之前攔截
22222222在方法調用之前攔截
1111111環(huán)繞通知
1111111111環(huán)繞通知生成的結果--你好 北京
方法完成之后調用的方法22222
方法完成之后調用的方法11111
北京生活圈

轉載于:https://my.oschina.net/hotbain/blog/119420

總結

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