静态代理和装饰模式的区别

最新推荐文章于 2022-09-24 06:22:50 发布

ThUG1234

最新推荐文章于 2022-09-24 06:22:50 发布

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分类专栏：设计模式

本文链接：https://blog.youkuaiyun.com/thug1234/article/details/80412494

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1 篇文章

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截取一篇文章里的总结：代理模式主要是控制对某个特定对象访问，而装饰模式主要是为了给对象添加行为

代理模式：

定义一个测试接口，里面定义一个测试用例执行方法

interface ITest{

void execute();

}

定义一个测试用例类，具体实现测试执行函数
class TestCase implements ITest{
    public void execute(){
        System.out.println("running testcase");
    }
}

定一个测试者类，因为测试用例本身不能去执行当然要人去执行，所以认为测试者是代理测试用例执行的代理类，同样实现具体execute方法，但是里面加了一些逻辑，只有叫xiaoming的测试者才能执行测试用例。

class Tester implements ITest{
    private ITest test;
    private String testerName;
    Tester(ITest test,String testerName){
        this.test = test;
        this.testerName = testerName;
    }
    public void execute(){
        if(testerName == "xiaoming"){
            System.out.println("I am xiaoming. I have permission to execute test.");
            test.execute();
        } else{
            System.out.println("Sorry, only xiaoming has permission to execute test.");
        }

    }

}

主程序

public class MyProxy {
    public static void main(String[] argv){
        ITest test = new TestCase();
        ITest tester1 = new Tester(test,"xiaoming");
        tester1.execute();
        ITest tester2 = new Tester(test,"xiaoxu");
        tester2.execute();

}

测试结果：

I am xiaoming. I have permission to execute test.
running testcase
Sorry, only xiaoming has permission to execute test.

}

装饰模式：

同样定义测试接口

interface ITest{
    void execute();
}
同样定义一个测试用例类
class TestCase implements ITest{
    public void execute(){
        System.out.println("running testcase");
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

定义一个时间装饰类，打印测试用例执行的开始时间和结束时间

class TimeDecorator{
    private ITest test;
    TimeDecorator(ITest test){
        this.test = test;
    }
    public void execute(){
        Date date = new Date();
        System.out.println("Case start time:" + date.toString());
        test.execute();
        date = new Date();
        System.out.println("Case end time:" + date.toString());
    }

}

测试：

public class MyDecorator {

    public static void main(String[] args) {
        ITest testcase = new TestCase();
        TimeDecorator td = new TimeDecorator(testcase);
        td.execute();

    }

}

结果：

Case start time:Tue May 22 22:35:05 CST 2018
running testcase
Case end time:Tue May 22 22:35:07 CST 2018