總述

其實(shí)這個(gè)模式很好理解，非常簡(jiǎn)單。就是前端一股腦地接收了一大堆請(qǐng)求，然后它根據(jù)各個(gè)請(qǐng)求的不同進(jìn)行相應(yīng)的分派，聽上去有點(diǎn)像路由器的意思，實(shí)際上也差不多。

類圖

類圖.png

調(diào)用

package com.company;

public class Main {

    public static void main(String[] args) {
    // write your code here
        FrontController controller = new FrontController();
        controller.receiveRequest(0);
        controller.receiveRequest(1);
        controller.receiveRequest(2);
        controller.receiveRequest(3);
    }
}

輸出

視圖1處理了請(qǐng)求
視圖2處理了請(qǐng)求
視圖3處理了請(qǐng)求
請(qǐng)求無(wú)效

Process finished with exit code 0

前端控制器

package com.company;

public class FrontController {
    private Dispatcher dispatcher = new Dispatcher();

    public void receiveRequest(int requestID) {
        this.dispatcher.dispatchRequest(requestID);
    }
}

分派器

package com.company;

public class Dispatcher {
    private ViewInterface[] views = {new View1(),new View2(),new View3()};

    public void dispatchRequest(int requestIndex) {
        if (requestIndex > -1 && requestIndex < views.length) {
            this.views[requestIndex].processRequest();
        } else {
            System.out.println("請(qǐng)求無(wú)效");
        }
    }
}

視圖接口

package com.company;

public interface ViewInterface {
    public void processRequest();
}

視圖1

package com.company;

public class View1 implements ViewInterface {
    @Override
    public void processRequest() {
        System.out.println("視圖1處理了請(qǐng)求");
    }
}

視圖2

package com.company;

public class View2 implements ViewInterface {
    @Override
    public void processRequest() {
        System.out.println("視圖2處理了請(qǐng)求");
    }
}

視圖3

package com.company;

public class View3 implements ViewInterface {
    @Override
    public void processRequest() {
        System.out.println("視圖3處理了請(qǐng)求");
    }
}

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