ssm中登录功能的实现以及页面跳转

项目地址:https://github.com/724888/lightnote_new

 

由于controller中配置了登录时的跳转页面,导致登录失败时会跳到当前页,若用  return "home";跳转到注册页则会导致url出现问题,第二次登录时会出现404错误,于是我新建了错误显示页,并在该页面重定向至登录页面,防止上述错误。

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public  class  UserController {
     
         @Resource
         private  UserService userService;
 
         @RequestMapping (value= "/login" )
         public  String login( @Param ( "username" ) String username, @Param ( "password" ) String password,HttpServletRequest request) {
            User user=userService.checkLogin(username, password);
             if (user!= null ){
                 HttpSession session=request.getSession();
                 session.setAttribute( "user" ,user);
                 return  "redirect:/user/home" ; // 路径 WEB-INF/pages/welcome.jsp           
             }
             request.setAttribute( "error" "用户名或密码错误" );
            
             
             return  "error" ;
         }
         
         @RequestMapping ( "registerpage" )
         public  String registerpage() {
           return  "register" ;
         }
         
         @RequestMapping ( "home" )
         public  String home() {
           return  "home" ;
         }
         
         @RequestMapping ( "register" )
         public  String register(User user,HttpServletRequest requsest) {
           if (userService.checkRegisterUsername(user.getUsername()))
               {
               return  "home" ;
               }
           return  "error" ;
         }
}

error.jsp

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
     String path = request.getContextPath();
     String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
     
     
%>
     
<! DOCTYPE  html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
< html >
< head >
 
 
< script  type="text/javascript">
 
 
setTimeout("javascript:location.href='http://localhost:8080/lightnote/index.jsp'", 3000);
</ script >
 
</ head >
< body >
< div  align="center">
     < br />
     < br />
     < br />
     < h4 >${error}</ h4 >
     < h4 >< a  href="http://localhost:8080/lightnote/index.jsp" >立即跳转</ a ></ h4 >
</ div >
  
</ body >
</ html >

页面较为简陋,可以实现定时跳转和立即跳转,并显示错误原因,重新定向至登录页面。


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