为什么无论输入什么，都会显示“账号和密码正确”？

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" import="com.imooc.bean.*,com.imooc.db.* "%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
     <%
                String account=request.getParameter("account");
                String password=request.getParameter("password");
                
               
                
                Emp emp=new Emp(account,null,password,null);
                boolean flag=DBUtil.selectEmpByAccountAndPassword(emp);
                //Map<String,Emp> map=DBUtil.map;
                if(flag==true){
               out.println("账号和密码正确");
      
                }else{
                 out.println("账号和密码错误");
                }
     %>
</body>
</html>

彻醉人生 2018-10-09

源自：JSP内置对象 2-2 request、out、response对象应用

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4回答

chrismorgen 回答被采纳获得+3积分 2018-10-11 09:51:23

如下图所示，DBUtil类中的if语句后面不应添加分号，应将分号去掉。

修订之后的效果如下，如果我的建议解决了你的问题，请采纳，祝学习愉快~

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提问者彻醉人生 2018-10-10 19:28:20

package com.imooc.bean;
public class Emp {
          private String account;
          private String name;
          private String password;
          private String email;
  public Emp(String account, String name, String password, String email) {
   super();
   this.account = account;
   this.name = name;
   this.password = password;
   this.email = email;
  }
  public String getAccount() {
   return account;
  }
  public void setAccount(String account) {
   this.account = account;
  }
  public String getName() {
   return name;
  }
  public void setName(String name) {
   this.name = name;
  }
  public String getPassword() {
   return password;
  }
  public void setPassword(String password) {
   this.password = password;
  }
  public String getEmail() {
   return email;
  }
  public void setEmail(String email) {
   this.email = email;
  }
          
          
           
          
}

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提问者彻醉人生 2018-10-10 19:27:58

package com.imooc.db;
import java.util.HashMap;
import java.util.Map;
import com.imooc.bean.Emp;
public class DBUtil {
           public static Map<String,Emp> map=new HashMap<String,Emp>(); 
           static {
            map.put("101", new Emp("101","AA","123456","AA@imooc.com"));
            map.put("102", new Emp("102","BB","123456","BB@imooc.com"));
            map.put("103", new Emp("103","CC","123456","CC@imooc.com"));
            map.put("104", new Emp("104","DD","123456","DD@imooc.com"));
            map.put("105", new Emp("105","EE","123456","EE@imooc.com"));
           }
           
           //判断用户名和密码是否正确
           public static boolean selectEmpByAccountAndPassword(Emp emp) {
            boolean flag=false;
            
            
            for(String key:map.keySet()) {
             Emp e=map.get(key);
             if(emp.getAccount().equals(e.getAccount())&&emp.getPassword().equals(e.getPassword()));{
              flag=true;
              break;
             }
            }
            return flag;
           }
}

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chrismorgen 2018-10-10 10:54:14

建议你检查一下DBUtil类中的selectEmpByAccountAndPassword(emp);方法的逻辑是否写的有问题？是不是无论如何都返回true呢？如果还有问题，可以将DBUtil的代码和Emp类的代码粘贴一下，方便老师具有针对性的解答，祝学习愉快~

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提问者彻醉人生 #1

package com.imooc.db; import java.util.HashMap; import java.util.Map; import com.imooc.bean.Emp; public class DBUtil { public static Map<String,Emp> map=new HashMap<String,Emp>(); static { map.put("101", new Emp("101","AA","123456","AA@imooc.com")); map.put("102", new Emp("102","BB","123456","BB@imooc.com")); map.put("103", new Emp("103","CC","123456","CC@imooc.com")); map.put("104", new Emp("104","DD","123456","DD@imooc.com")); map.put("105", new Emp("105","EE","123456","EE@imooc.com")); } //判断用户名和密码是否正确 public static boolean selectEmpByAccountAndPassword(Emp emp) { boolean flag=false; for(String key:map.keySet()) { Emp e=map.get(key); if(emp.getAccount().equals(e.getAccount())&&emp.getPassword().equals(e.getPassword()));{ flag=true; break; } } return flag; } }

2018-10-10 19:27:00