装饰器模式与代理模式

package pattern.decorator;
/**
 * @author futao
 * Created on 18-8-21-上午6:06.
 */
public interface ISomeService {
    String doSome(String parameter);
}

package pattern.decorator;
/**
 * @author futao
 * Created on 18-8-21-上午6:07.
 */
public class SomeService implements ISomeService {
    @Override
    public String doSome(String parameter) {
        return parameter;
    }
}

@Test
  public void test18() {
       ISomeService iSomeService = new SomeService();
      String some = iSomeService.doSome("woqu hhh");
      System.out.println(some);
  }
>>> woqu hhh

package pattern.decorator;
/**
 * @author futao
 * Created on 18-8-21-下午4:58.
 * 装饰器，增强SomeService
 * 1.继承同一个接口
 * 2.在装饰器类中添加一个构造方法--在构造方法中添加需要增强的那个类的引用(装饰器类中要有目标对象作为成员变量，且目标对象是通过带参构造器传入的)
 */
public class SomeServiceDecorator implements ISomeService {
    ISomeService iSomeService;
    @Override
    public String doSome(String parameter) {
        //先执行原有的业务逻辑
        String some = iSomeService.doSome(parameter);
        //对执行结果进行增强
        return some.toUpperCase();
    }
    /**
     * 要求一定要传入需要增强（装饰的那个类-对象）
     *
     * @param iSomeService
     */
    public SomeServiceDecorator(ISomeService iSomeService) {
        super();
        this.iSomeService = iSomeService;
    }
}

@Test
    public void test18() {
        //目标对象
        SomeService someService = new SomeService();
        //装饰器
        ISomeService iSomeService = new SomeServiceDecorator(someService);
        //面向接口编程
        String some = iSomeService.doSome("woqu hhh");
        System.out.println(some);
    }

package pattern.proxy;
/**
 * @author futao
 * Created on 18-8-21-下午6:58.
 */
public interface ISomeService {
    String doSome();
    String doOther();
}

package pattern.proxy;
/**
 * @author futao
 * Created on 18-8-21-下午7:01.
 * 业务逻辑
 */
public class SomeService implements ISomeService {
    @Override
    public String doSome() {
        return "abcde";
    }
    @Override
    public String doOther() {
        return "今晚打老虎";
    }
}

package pattern.proxy;
import com.alibaba.fastjson.JSONObject;
/**
 * @author futao
 * Created on 18-8-21-下午6:58.
 * 代理类
 */
public class SomeServiceProxy implements ISomeService {
    //代理对象---通过实例化new的方式直接创建
    private ISomeService target = new SomeService();
    @Override
    public String doSome() {
        return target.doSome();
    }
    /**
     * 隐藏一些逻辑
     *
     * @return
     */
    @Override
    public String doOther() {
        //可以加上一些控制逻辑
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("result", "无权限访问此资源.");
        return JSONObject.toJSONString(jsonObject);
    }
}

@Test
    public void test19(){
        //不要实例化目标对象，没有暴露目标对象
        pattern.proxy.ISomeService iSomeService=new SomeServiceProxy();
        System.out.println(iSomeService.doSome());
        System.out.println(iSomeService.doOther());
    }
>>>   abcde
      {"result":"无权限访问此资源."}