轻松掌握Java代理模式

/**
 * 以买房举例
 */
interface Actions {

 /**
 * 选房
 */
 public void selectHouse();
 
 /**
 * 看房
 */
 public void seeHouse();
 
 /**
 * 入住
 */
 public void ruzhu();
 
}

class RealRole implements Actions{

 public void selectHouse() {
 System.out.println("用户自己选房");
 }

 public void seeHouse() {
 System.out.println("用户自己看房");
 }

 public void ruzhu() {
 System.out.println("用户自己入住");
 }

}

class ProxyRole implements Actions{

 private RealRole realRole;
 
 public ProxyRole(RealRole realRole) {
 this.realRole = realRole;
 }
 
 public void selectHouse() {
 System.out.println("中介选房");
 }

 public void seeHouse() {
 System.out.println("中介看房");
 }

 @Override
 public void ruzhu() {
 realRole.ruzhu();
 }

}

public class Demo {

 public static void main(String[] args) {
 RealRole realRole = new RealRole();
 ProxyRole proxyRole = new ProxyRole(realRole);
 proxyRole.selectHouse();
 proxyRole.seeHouse();
 proxyRole.ruzhu();
 }
}

/**
 * 以买房举例
 */
interface Actions {

 /**
 * 选房
 */
 public void selectHouse();
 
 /**
 * 看房
 */
 public void seeHouse();
 
 /**
 * 入住
 */
 public void ruzhu();
 
}

class RealRole implements Actions{

 public void selectHouse() {
 System.out.println("用户自己选房");
 }

 public void seeHouse() {
 System.out.println("用户自己看房");
 }

 public void ruzhu() {
 System.out.println("用户自己入住");
 }

}

class Handler implements InvocationHandler{

 private RealRole realRole ;
 
 public Handler(RealRole realRole) {
 this.realRole = realRole;
 }
 
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 System.out.println(realRole);
 System.out.println("中介选房，看房");
 method.invoke(realRole, args);
 return null;
 }

}

public class Demo {

 public static void main(String[] args) {
 RealRole realRole = new RealRole();
 
 Handler handler = new Handler(realRole);
 
 Actions proxy = (Actions) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(), new Class[]{Actions.class}, handler);
 proxy.ruzhu();
 }
}