代理模式和回调

用java实现来代理模式和callback，两者之间的相似之处和不同之处自己揣摩。代理模式的代理内容接口函数分别用抽象类和接口类实现本质一样。
代理模式

com.niotong.Service.java代码如下

package com.niotong;
//代理的内容，代理需要服务端做的事
public interface  Service {
    public abstract void eat();
    public abstract void shit();
    public abstract void sleep();
}

com.niotong.Client.java代码如下

package com.niotong;
//实现需要代理的内容
public class Client implements Service{

    @Override
    public void eat() {
        // TODO Auto-generated method stub
        System.out.print("client eat \n");
    }

    @Override
    public void shit() {
        // TODO Auto-generated method stub
        System.out.print("client shit \n");
    }

    @Override
    public void sleep() {
        // TODO Auto-generated method stub
        System.out.print("client sleep \n");
    }

}

com.niotong.Server.java代码如下

package com.niotong;

public class Server implements Service{
    private Client cli;
    Server(Client cli){
        this.cli = cli;
    }
    @Override
    public void eat() {
        // TODO Auto-generated method stub
        //回调客户端
        cli.eat();
    }

    @Override
    public void shit() {
        // TODO Auto-generated method stub
        cli.shit();
    }

    @Override
    public void sleep() {
        // TODO Auto-generated method stub
        cli.sleep();
    }

}

以上基本实现来代理模式，就差main函数了。下面是用抽象类来实现上面的代码。

com.niotong.ServiceAbstract.java代码如下

package com.niotong;

public abstract class ServiceAbstract {
    public abstract void eat();
    public abstract void shit();
    public abstract void sleep();
}

com.niotong.ClientAbstract.java代码如下

package com.niotong;
//继承需要代理内容的抽象类，实现需要代理的内容
public class ClientAbstract extends ServiceAbstract{

    @Override
    public void eat() {
        // TODO Auto-generated method stub
        System.out.print("client eat \n");
    }

    @Override
    public void shit() {
        // TODO Auto-generated method stub
        System.out.print("client shit \n");
    }

    @Override
    public void sleep() {
        // TODO Auto-generated method stub
        System.out.print("client sleep \n");
    }

}

com.niotong.ServerAbstract.java代码如下

package com.niotong;
//继承代理内容的抽象类
public class ServerAbstract extends ServiceAbstract{
    private ClientAbstract cli;
    public ServerAbstract(ClientAbstract cli) {
        // TODO Auto-generated constructor stub
        this.cli = cli;
    }
    @Override
    public void eat() {
        // TODO Auto-generated method stub
        cli.eat();
    }

    @Override
    public void shit() {
        // TODO Auto-generated method stub
        cli.shit();
    }

    @Override
    public void sleep() {
        // TODO Auto-generated method stub
        cli.sleep();
    }

}

这是抽象类实现的，基本和接口实现的没差

以下是主函数com.niotong.ProxyMain.java代码如下

package com.niotong;

public class ProxyMain {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Client cli = new Client();
        Server ser = new Server(cli);       //让服务端代理
        ser.eat();
        ser.shit();
        ser.sleep();
        ClientAbstract cliabs = new ClientAbstract();
        ServiceAbstract serabs = new ServerAbstract(cliabs);
        serabs.eat();
        serabs.shit();
        serabs.sleep();
        return;
    }

}

至此代理模式就简单的实现了

callback

com.niotong.Callback.java代码如下

package com.niotong;

public interface Callback {
    public abstract void callback(String mesg);
}

com.niotong.Client.java代码如下

package com.niotong;

public class Client implements Callback{

    //持有快递公司的引用
    public Server ser = new Server(Client.this);
    //我寄件
    public void send(){
        System.out.print("wo shi ke hu ,wo yao ji jian!\n");
        ser.recive(); //将会回调
    }
    //回调函数
    @Override
    public void callback(String mesg) {
        // TODO Auto-generated method stub
        System.out.print("jie dao kuai di lai de dian hua "+ mesg+"\n");
    }

}

com.niotong.Server.java代码如下

package com.niotong;

public class Server  {
    private Callback cal;
    Server(Callback cal){
        this.cal = cal;
    }
    public void recive(){
        callback("wo yao lai shou jian lliao\n");
    }
    public void callback(String a){
        cal.callback(a);
    }
}

主函数com.niotong.CallbackMain.java代码如下

package com.niotong;


public class CallbackMain {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Client cli = new Client();
        cli.send();
    }

}

至此回调也实现了。回调和代理模式的代码稍微对比下应该能够看出区别