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云代码 - java代码库

用户登录 自定义异常捕获

2016-04-13 作者： 夕阳巷尾白衬衫举报

[java]代码库

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FieldRequiredException.java
package Experience;
 
public class FieldRequiredException extends Exception{
    public FieldRequiredException(String who) {
        super(who+"不能为空！");
    }
}
 
WrongPasswordException.java
package Experience;
 
public class WrongPasswordException extends Exception{
    public WrongPasswordException() {
        super("密码错误！");
    }
}
 
UserNameNotFoundException.java
package Experience;
 
public class UserNameNotFoundException extends Exception{
    public UserNameNotFoundException() {
        super("用户名不存在！");
    }
}
 
LoginService.java
package Experience;
 
public class LoginService {
     
    public void login(String UserName,String password)
    throws FieldRequiredException,WrongPasswordException,
    UserNameNotFoundException{
         
        if (UserName==null||UserName.trim().length()<1) {
            throw new FieldRequiredException("用户名");
        }
        if (password==null||password.length()<1) {
            throw new FieldRequiredException("密码");
        }
        if (UserName.trim().equals("admin")) {
            if (password.equals("admin")) {
                return;
            }else {
                throw new WrongPasswordException();
            }
        }else {
            throw new UserNameNotFoundException();
        }
    }
     
}
 
 
LoginClient.java
package Experience;
 
import java.util.Scanner;
 
public class LoginClient {
 
    public static void main(String[] args) {
         
        try {
         
            Scanner scanner=new Scanner(System.in);
            System.out.println("请输入用户名：");
            String UserName=scanner.nextLine();
            System.out.println("请输入密码：");
            String password=scanner.nextLine();
             
            LoginService loginService=new LoginService();
            loginService.login(UserName, password);
             
        } catch (FieldRequiredException e) {
             
            System.err.println(e.getMessage());
             
        } catch (WrongPasswordException e) {
             
            System.err.println(e.getMessage());
             
        } catch (UserNameNotFoundException e) {
             
            System.err.println(e.getMessage());
        }
    }
 
}


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