spring源码学习之【准备】cglib动态代理例子

一：委托者

 package com.yeepay.porxy.cglib.test;

 import java.util.HashMap;
 import java.util.Map;

 /**
  * 目标类，（委托类）
  * @author shangxiaofei
  *
  */
 public class PaymentServer {

     public Map<String, String> payMoney(String name,Integer money){
         System.out.println("paymentServer.payMoney()付钱=========>名字【"+name+"】,money=【"+money+"】");
         Map<String, String> map=new HashMap<String, String>();
         map.put("result", "已经完成付钱");
         return map;
     }
 }

二：增强者（代理类）

 package com.yeepay.porxy.cglib.test;

 import java.lang.reflect.Method;

 import net.sf.cglib.proxy.MethodInterceptor;
 import net.sf.cglib.proxy.MethodProxy;
 /**
  * 增强类
  * @author shangxiaofei
  *
  */
 public class PoxyForService implements MethodInterceptor{

     @Override
     public Object intercept(Object arg0, Method arg1, Object[] arg2,MethodProxy arg3) throws Throwable {
           // 增强功能的代码
         System.out.println("PoxyForService.intercept(方法执行前执行========>向统计发送消息)");
         if(arg2!=null&&arg2.length>0){
             for(int i=0;i<arg2.length;i++){
                 System.out.println("PoxyForService.intercept()发送的参数内容====>"+arg2[i]);
             }
         }

         //执行方法内容
         Object object=arg3.invokeSuper(arg0, arg2);

         System.out.println("PoxyForService.intercept(方法执行后执行=======>计算时间)");
         return object;
     }

 }

三：创造代理的工厂类

 package com.yeepay.porxy.cglib.test;

 import net.sf.cglib.proxy.Enhancer;

 /**
  * 代理实现工厂类
  * @author shangxiaofei
  *
  */
 public class PoxyFactory {
      public static PaymentServer getPaymentServer(){
          // Cglib 核心类，生成代理对象
         Enhancer enhancer= new Enhancer();
          // 为核心类对象中放入需要代理的委托类的类对象
         enhancer.setSuperclass(PaymentServer.class);
          // 为核心类对象中放入增强功能的类对象
         enhancer.setCallback(new PoxyForService());
          // 从核心类对象中获取委托类的代理对象
         Object object=enhancer.create();

         return (PaymentServer) object;
      }
 }

四：测试类

 package com.yeepay.porxy.cglib.test;

 import java.util.Map;
 /**
  * 测试类
  * @author shangxiaofei
  *
  */
 public class TestController {

     private PaymentServer paymentServer=PoxyFactory.getPaymentServer();

     public void payment(){
         System.out.println("TestController.payment()开始");
         Map<String, String> map=paymentServer.payMoney("怪物雷克", 100);
         System.out.println("TestController.payment()结束===>"+map.get("result"));
     }

     /**
      * TestController.payment()开始
      * PoxyForService.intercept(方法执行前执行========>向统计发送消息)
      * PoxyForService.intercept()发送的参数内容====>怪物雷克
      * PoxyForService.intercept()发送的参数内容====>100
      * paymentServer.payMoney()付钱=========>名字【怪物雷克】,money=【100】
      * PoxyForService.intercept(方法执行后执行=======>计算时间)
      * TestController.payment()结束===>已经完成付钱
      * @param args
      */
     public static void main(String[] args) {
         TestController testController=new TestController();
         testController.payment();
     }
 }