spring源码学习之【准备】cglib动态代理例子

一：委托者

 1 package com.yeepay.porxy.cglib.test;
 2
 3 import java.util.HashMap;
 4 import java.util.Map;
 5
 6 /**
 7  * 目标类，（委托类）
 8  * @author shangxiaofei
 9  *
10  */
11 public class PaymentServer {
12
13     public Map<String, String> payMoney(String name,Integer money){
14         System.out.println("paymentServer.payMoney()付钱=========>名字【"+name+"】,money=【"+money+"】");
15         Map<String, String> map=new HashMap<String, String>();
16         map.put("result", "已经完成付钱");
17         return map;
18     }
19 }

二：增强者（代理类）

 1 package com.yeepay.porxy.cglib.test;
 2
 3 import java.lang.reflect.Method;
 4
 5 import net.sf.cglib.proxy.MethodInterceptor;
 6 import net.sf.cglib.proxy.MethodProxy;
 7 /**
 8  * 增强类
 9  * @author shangxiaofei
10  *
11  */
12 public class PoxyForService implements MethodInterceptor{
13
14     @Override
15     public Object intercept(Object arg0, Method arg1, Object[] arg2,MethodProxy arg3) throws Throwable {
16           // 增强功能的代码
17         System.out.println("PoxyForService.intercept(方法执行前执行========>向统计发送消息)");
18         if(arg2!=null&&arg2.length>0){
19             for(int i=0;i<arg2.length;i++){
20                 System.out.println("PoxyForService.intercept()发送的参数内容====>"+arg2[i]);
21             }
22         }
23
24
25         //执行方法内容
26         Object object=arg3.invokeSuper(arg0, arg2);
27
28
29         System.out.println("PoxyForService.intercept(方法执行后执行=======>计算时间)");
30         return object;
31     }
32
33
34
35 }

三：创造代理的工厂类

 1 package com.yeepay.porxy.cglib.test;
 2
 3 import net.sf.cglib.proxy.Enhancer;
 4
 5 /**
 6  * 代理实现工厂类
 7  * @author shangxiaofei
 8  *
 9  */
10 public class PoxyFactory {
11      public static PaymentServer getPaymentServer(){
12          // Cglib 核心类，生成代理对象
13         Enhancer enhancer= new Enhancer();
14          // 为核心类对象中放入需要代理的委托类的类对象
15         enhancer.setSuperclass(PaymentServer.class);
16          // 为核心类对象中放入增强功能的类对象
17         enhancer.setCallback(new PoxyForService());
18          // 从核心类对象中获取委托类的代理对象
19         Object object=enhancer.create();
20
21         return (PaymentServer) object;
22      }
23 }

四：测试类

 1 package com.yeepay.porxy.cglib.test;
 2
 3 import java.util.Map;
 4 /**
 5  * 测试类
 6  * @author shangxiaofei
 7  *
 8  */
 9 public class TestController {
10
11     private PaymentServer paymentServer=PoxyFactory.getPaymentServer();
12
13     public void payment(){
14         System.out.println("TestController.payment()开始");
15         Map<String, String> map=paymentServer.payMoney("怪物雷克", 100);
16         System.out.println("TestController.payment()结束===>"+map.get("result"));
17     }
18
19
20     /**
21      * TestController.payment()开始
22      * PoxyForService.intercept(方法执行前执行========>向统计发送消息)
23      * PoxyForService.intercept()发送的参数内容====>怪物雷克
24      * PoxyForService.intercept()发送的参数内容====>100
25      * paymentServer.payMoney()付钱=========>名字【怪物雷克】,money=【100】
26      * PoxyForService.intercept(方法执行后执行=======>计算时间)
27      * TestController.payment()结束===>已经完成付钱
28      * @param args
29      */
30     public static void main(String[] args) {
31         TestController testController=new TestController();
32         testController.payment();
33     }
34 }