注册登录判断---后台代码（1）

本人现阶段是个学生，写代码没有什么经验，都是通过感觉写的，请各位大神指出错误所在，谢谢

后台代码：

思路：将前端文本框的用户名和密码，以参数传到后台Action中，之后进行查询，如果查询到的结果为0，则用户不存在，否则存在，之后在把返回值0 和 1通过Ajax接收，进行判断

Action

 1 package net.xx.controller;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 5 import java.io.UnsupportedEncodingException;
 6 import java.net.URLDecoder;
 7 
 8 import org.apache.struts2.ServletActionContext;
 9 import org.springframework.beans.factory.annotation.Autowired;
10 import org.springframework.context.annotation.Scope;
11 import org.springframework.stereotype.Controller;
12 
13 import com.opensymphony.xwork2.Action;
14 
15 import net.xx.domain.Usert;
16 import net.xx.service.IUserService;
17 
18 @Controller
19 @Scope("prototype")
20 public class LoginAction {
21     @Autowired
22     private IUserService userService;
23     private Object data4;
24     private Usert usert; 
25     private String username;
26     private String password;
27      
28     
29     public String getUsername() {
30         return username;
31     }
32     public void setUsername(String username) {
33         this.username = username;
34     }
35      
36     public Object getData4() {
37         return data4;
38     }
39     public void setData4(Object data4) {
40         this.data4 = data4;
41     }
42     public Usert getUsert() {
43         return usert;
44     }
45     public void setUsert(Usert usert) {
46         this.usert = usert;
47     }
48     
49     public String getPassword() {
50         return password;
51     }
52     public void setPassword(String password) {
53         this.password = password;
54     }
55     public String execute(){
56         boolean flag = userService.findUser(usert);
57         if(flag){
58             return Action.SUCCESS;
59         }else{
60             return Action.INPUT;
61         }
62     }
63     public String check() throws IOException{
64         username = URLDecoder.decode(username, "UTF-8");
65         password = URLDecoder.decode(password, "UTF-8");
66         data4 = userService.checkUser(username,password).size();
67         int i = (int) data4;
68         String result = "";
69         if(i == 0){
70             //用户不存在
71             result = "0";
72         }else{
73             result = "1";
74         }
75          PrintWriter out =  ServletActionContext.getResponse().getWriter();
76          out.write(result.toString());     
77         return Action.SUCCESS;
78     }
79     
80     
81 }

Dao接口

 1 package net.xx.dao;
 2 
 3 import java.util.List;
 4 
 5 import net.xx.domain.Usert;
 6 
 7 public interface IUserDao {
 8   //声明增加和查找方法
 9     public void saveUser(Usert user);
10     public Usert findUser(Usert user);
11     public List<Usert> getUser();
12     public List<Usert> getUserByUsername(String username);
13     public List<Usert> check(String username,String password);
14     public List<Usert> checkPassword(String username);
15 }

Dao实现类

 1 package net.xx.dao;
 2 
 3 import java.util.List;
 4 
 5 import org.hibernate.SessionFactory;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.stereotype.Repository;
 8 
 9 import net.xx.domain.Usert;
10 @Repository
11 public class UserDaoImpl implements IUserDao{
12      @Autowired
13      private SessionFactory sessionfactory;
14     @Override
15     public void saveUser(Usert user) {
16         // TODO Auto-generated method stub
17         sessionfactory.getCurrentSession().save(user);
18     }
19 
20     @Override
21     public Usert findUser(Usert user) {
22         // TODO Auto-generated method stub
23         Usert firstuser = new Usert();
24         String hql = "from User user where user.username='"+user.getUsername()+"'and user.password'"+user.getPassword()+"'";
25         //将查询结果放到List
26         List<Usert> userlist = (List<Usert>) sessionfactory.getCurrentSession().createQuery(hql);
27         if(userlist.size()>0){
28             firstuser = userlist.get(0);
29         }
30         
31         return firstuser;
32     }
33     //遍历数据库中的数据
34     @Override
35     public List<Usert> getUser() {
36         // TODO Auto-generated method stub
37         String hql="from Usert";
38         List<Usert> users = sessionfactory.getCurrentSession().createQuery(hql).list();
39         return users;
40     }
41 
42     @Override
43     public List<Usert> getUserByUsername(String username) {
44         // TODO Auto-generated method stub
45         String hql= "select * from Usert where username='"+username+"'";
46         //通过输入的参数，得到用户的信息
47         List<Usert> users =  (List<Usert>) sessionfactory.getCurrentSession().createSQLQuery(hql).list();
48         return users; 
49     }
50 
51     @Override
52     public List<Usert> check(String username,String password) {
53         // TODO Auto-generated method stub
54         String hql = "select * from Usert where username='"+username+"' and password='"+password+"'";
55         List<Usert> users = sessionfactory.getCurrentSession().createSQLQuery(hql).list();
56         return users;
57     }
58 
59     @Override
60     public List<Usert> checkPassword(String username) {
61         // TODO Auto-generated method stub
62         String hql = "select password from Usert where username ='"+username+"'";
63         List<Usert> password = sessionfactory.getCurrentSession().createSQLQuery(hql).list();
64         
65         return password;
66     }
67 }

Service接口

 1 package net.xx.service;
 2 
 3 import java.util.List;
 4 
 5 import net.xx.domain.Usert;
 6 
 7 public interface IUserService {
 8    public void saveUser(Usert user);
 9    public boolean findUser(Usert user);
10    List list();
11    public List getUserByUsername(String username);
12    List checkUser(String username,String password);
13 }

Service实现类

 1 package net.xx.service;
 2 
 3 import java.util.List;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Service;
 7 
 8 import net.xx.dao.IUserDao;
 9 import net.xx.domain.Usert;
10 @Service
11 public class UserServiceImpl implements IUserService{
12      @Autowired
13      private IUserDao userDao;
14     @Override
15     public void saveUser(Usert user) {
16         // TODO Auto-generated method stub
17         userDao.saveUser(user);
18     }
19     @Override
20     public boolean findUser(Usert user) {
21         // TODO Auto-generated method stub
22         Usert firstuser = userDao.findUser(user);
23         if(firstuser.getUsername()!=null){
24             return true; 
25         }else{
26             return false;
27         }         
28     }
29 
30     @Override
31     public List list() {
32         // TODO Auto-generated method stub
33         List<Usert> users = userDao.getUser();
34         return users;
35     }
36 
37     @Override
38     public List getUserByUsername(String username) {
39         // TODO Auto-generated method stub
40         List<Usert> users =userDao.getUserByUsername(username);
41         return users;
42     }
43 
44     @Override
45     public List checkUser(String username,String password) {
46         // TODO Auto-generated method stub
47         List<Usert> users = userDao.check(username,password);
48         return users;
49     }     
50 }

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注册登录判断---后台代码（1）