Java中反射动态代理接口的详解及实例

package com.example.pojo; 
 
public interface IExample { 
   
  public void setName(String name); 
   
  public String getName(); 
   
  public void setDesc(String description); 
   
  public String getDesc(); 
   
} 

package com.example.pojo; 
 
public interface IUser { 
   
  public void setUserID(String userID); 
   
  public String getUserID(); 
   
  public void setUserName(String userName); 
   
  public String getUserName(); 
 
} 

package com.example.reflection; 
 
import java.lang.reflect.InvocationHandler; 
import java.lang.reflect.Method; 
import java.lang.reflect.Proxy; 
import java.util.HashMap; 
import java.util.Map; 
 
public class MyProxyView implements InvocationHandler { 
  private Map<Object, Object> map = null; 
 
  public static Object newInstance(Class[] interfaces) { 
    return Proxy.newProxyInstance(MyProxyView.class.getClassLoader(), 
        interfaces, new MyProxyView()); 
  } 
 
  private MyProxyView() { 
    this.map = new HashMap<Object, Object>(); 
  } 
 
  @Override 
  public Object invoke(Object proxy, Method method, Object[] args) 
      throws Throwable { 
    Object result = null; 
    String methodName = method.getName(); 
    if (methodName.startsWith("get")) { 
      String name = methodName.substring(methodName.indexOf("get") + 3); 
      return map.get(name); 
    } else if (methodName.startsWith("set")) { 
      String name = methodName.substring(methodName.indexOf("set") + 3); 
      map.put(name, args[0]); 
      return null; 
    } else if (methodName.startsWith("is")) { 
      String name = methodName.substring(methodName.indexOf("is") + 2); 
      return (map.get(name)); 
    } 
    return result; 
  } 
 
} 

package com.example.reflection; 
 
import com.example.pojo.IExample; 
import com.example.pojo.IUser; 
 
public class TextProxy { 
   
  public static void main(String[] args) 
  { 
    IExample example = (IExample)MyProxyView.newInstance(new Class[]{IExample.class}); 
     
    IUser user = (IUser)MyProxyView.newInstance(new Class[]{IUser.class}); 
     
    // aduit bean 1 
    example.setName("my example"); 
    example.setDesc("my proxy example"); 
    // aduit bean 2 
    user.setUserID("jia20003"); 
    user.setUserName("gloomyfish"); 
     
    System.out.println("exmaple name : " + example.getName()); 
    System.out.println("exmaple desc : " + example.getDesc()); 
    System.out.println(); 
    System.out.println("user ID : " + user.getUserID()); 
    System.out.println("user name : " + user.getUserName()); 
  } 
 
} 

exmaple name : my example 
exmaple desc : my proxy example 
 
user ID : jia20003 
user name : gloomyfish