By yusijia

Updated:

Contents
  1. 1. 实例 2
    1. 1.1. UseCase.java:
    2. 1.2. PasswordUtils.java:
    3. 1.3. UseCaseChecker.java

实例 2

UseCase.java:

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package lianxi;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface UseCase {
	public int id() default -1;
	
	public String description() default "No desciption"; 
}

PasswordUtils.java:

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package lianxi;

import java.util.ArrayList;
import java.util.List;
import java.lang.*;

public class PasswordUtils {
	
	@UseCase (id = 47, description = "密码必须包含至少一个数字")
	public boolean vaildPassword(String password){
		return password.matches("\\w*\\d\\w*");
	}
	
	@UseCase(id = 48)
	public String encryptPassword(String password){
		return new StringBuilder(password).reverse().toString();
	}
	
	@UseCase(id = 49, description = "新密码不能和曾经用过的密码重复")
	public boolean checkForNewPassword(List<String> prePasswords, String password){
		return !prePasswords.contains(password);
	}
	
	/*
	 * @deprecated不准备使用这个方法了，用其他的方法代替它吧
	 */
	@Deprecated
	public void deprecated(){}
	
	@SuppressWarnings({"unused", "rawtypes"})
	public void unsafeMethod(){
		List unsafeList = new ArrayList<String>();
	}
}

UseCaseChecker.java

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package lianxi;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/*
 *  用例检测的注解处理器
 */

public class UseCaseChecker {
	
	public static void trackUseCases(List<Integer> useCases, Class<?> cl)
	{		
		for(Method m : cl.getDeclaredMethods())//遍历cl的所有方法
		{
			UseCase uc = m.getAnnotation(UseCase.class);//获得方法的注解
			if(uc != null)
			{
				System.out.println("找到用例:" + uc.id () + " " + uc.description ());//输出该方法的注解的参数
				useCases.remove(new Integer(uc.id()));
			}
		}
		for(int i : useCases)
		{
			System.out.println ("警告-- 缺失用例:" + i);  
		}
	}
	public static void main(String[] args){
        List<Integer> useCases = new ArrayList<Integer>();
        Collections.addAll(useCases, 47, 48, 49, 50);
        trackUseCases(useCases, PasswordUtils.class);
    }
}
注意：如果trackUseCases()方法不声明为static的话会：
Cannot make a static reference to the non-static method trackUseCases(List<Integer>, Class<?>) from the type UseCaseChecker

输出：
找到用例:49 新密码不能和曾经用过的密码重复
找到用例:48 No desciption
找到用例:47 密码必须包含至少一个数字
警告-- 缺失用例:50
Contents
  1. 1. 实例 2
    1. 1.1. UseCase.java:
    2. 1.2. PasswordUtils.java:
    3. 1.3. UseCaseChecker.java