使用拦截器之后无法登录网页

Question

输入账号密码点登录还是这个页面，没变化，网址变成http://localhost:8080/login
注释掉拦截器网页都可以用，也可以登录加上拦截器就登陆不了了

```java
package controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import pojo.User;

import javax.servlet.http.HttpSession;

@Controller
public class UserController {
    @RequestMapping("/main1")
    public String main(){

        return "main";
    }

    @RequestMapping("/toLogin")
    public String toLogin(){

        return "login";
    }

    @RequestMapping("/toOrderInfo")
    public String toOrderInfo(){

        return "orderinfo";
    }

    //登录
    @RequestMapping("/login")
    public String login(User user, Model model,HttpSession session){

        //判断用户名和密码
        String username = user.getUsername();
        String password = user.getPassword();
        if (username!=null&&"李硕".equals(username)&&password!=null&&"123456".equals(password)){
            //登录成功
            session.setAttribute("user",user);

            return "redirect:main";
        }else{
            //登陆失败
            model.addAttribute("msg","用户名或者密码错误");
            return "login";
        }
    }


    //退出成功，需要跳转到登陆页面
    @RequestMapping("/logout")
    public String logOut(HttpSession session){

        session.invalidate();

        return "login";
    }
}

package interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //针对登录和跳转到登录页面的进行放行
        String requestURI=request.getRequestURI();
        if (requestURI.indexOf("/login")>0||
        requestURI.indexOf("/toLogin")>0){
            //直接放行
            return true;
        }
        //其他请求需要做登陆权限拦截判断
        HttpSession session = request.getSession();
        Object user = session.getAttribute("user");
        if (user!=null){
            //登录成功，放行
            return true;
        }
        //没有登录，跳转到登录页面
        request.setAttribute("msg","您还没有登录，请先登录");
        //此处视图解析器不生效，原生Javweb技术;
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp")
                .forward(request,response);

        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

```

Answer 1

可以用debug追踪一下代码，看看是否逻辑不正确