实体类：

public class User {  /**   * 主键id   */  private Integer userId;  /**   * 账号   */  private String username;  /**   * 密码   */  private String password;  public Integer getUserId() {    return userId;  }  public void setUserId(Integer userId) {    this.userId = userId;  }  public String getUsername() {    return username;  }  public void setUsername(String username) {    this.username = username;  }  public String getPassword() {    return password;  }  public void setPassword(String password) {    this.password = password;  }}

UserMapper

                     select * from s_user where username=#{username}  

mapper层

public interface UserMapper { User getUserByname(String username);}

service层

public interface UserService {  User getUserByname(String username, String password, HttpSession session, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse);}

impl

@Servicepublic class UserServiceImpl implements UserService {  @Autowired  private UserMapper userMapper;  @Override  public ResultVO getUserByname(String username, String password, HttpSession session, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {    String remember = httpServletRequest.getParameter("remember");    if (username!= null && username!= 0){      User user = userMapper.getUserByname(username);      if (user != null && user.getPassword().equals(password)){        session.setAttribute("user", user);        if (remember != null){          Cookie cookieUser = new Cookie("username", username);          Cookie cookiePass = new Cookie("password", password);          cookieUser.setMaxAge(60 * 60 * 24);          cookiePass.setMaxAge(60 * 60 * 24);          httpServletResponse.addCookie(cookieUser);          httpServletResponse.addCookie(cookiePass);          return ResultVO.success(user);       }        return ResultVO.error(1, "用户名或密码错误");      }    return ResultVO.error(3, "用户名或密码不能为空");  }}

Controller

@RestControllerpublic class UserController {  @Autowired  private UserService userService;  //登录  @RequestMapping("/getUserByname")  public ResultVO getUserByname(String username, String password, HttpSession session, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){    return userService.getUserByname(username, password, session, httpServletRequest, httpServletResponse);  }}

前端代码（JSP）

html的自己修改下，样式是BootStrap的

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><%@ page contentType="text/html;charset=UTF-8" language="java" %>