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