Easily master Java proxy mode

Definition: Provide a proxy for other objects to control access to this object. In some cases, one object is not suitable or cannot directly reference another object, and a proxy object can act as an intermediary between the client and the target object.

Features:

1. The real role is to implement the actual business logic. You don’t need to care about other matters that are not your responsibilities. You can complete a completed transaction through the later agent, and the accompanying result is programming. Be concise and clear.

2. The proxy object can act as an intermediary between the client and the target object, thus playing the role of intermediary and protecting the target object.

3. High scalability

Enterprise-level development and applications in common frameworks: the most famous one is spring's aop, and the creation of spring's beans also uses proxies

The proxy mode is divided into dynamic proxy and static proxy. Dynamic proxy is particularly used in development.

Static proxy:

/**
 * 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();
 }
}

Dynamic proxy:

/**
 * 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();
 }
}

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