shiro登录成功之后跳转原路径

通过 WebUtils.getSavedRequest(request) 来获取shiro保存在session登录之前的url

1：java Controller代码

     @PostMapping("/login")
     @ResponseBody
     public R login(HttpServletRequest request,
             String username, String password, String code) {
         if (!StringUtils.isNotBlank(code)){
             return  R.warn("请输入验证码！");
         }
         if (!"VBK8".equalsIgnoreCase(code)){
             return  R.warn("验证码输入错误,请重新输入验证码！");
         }
         password = MD5Utils.encrypt(username, password);
         UsernamePasswordToken token = new UsernamePasswordToken(username, password);
         try {
             super.login(token);
             this.userService.updateLoginTime(username);
             //登录成功之后跳转到原url
             SavedRequest savedRequest = WebUtils.getSavedRequest(request);
             String url = "/";
             if(savedRequest != null){
                 url = savedRequest.getRequestUrl();
             }
             return R.ok(url);
         } catch (UnknownAccountException | IncorrectCredentialsException | LockedAccountException e) {
             return R.error(e.getMessage());
         } catch (AuthenticationException e) {
             return R.error("认证失败！");
         }
     }

js代码：

 function login(){
     var username = $("#username").val();
     var password = $("#password").val();
 //    var code = $("#code").val();
     var code = 'vbk8';

     if(username.trim().length < 5 ||
        password.trim().length < 5 ||
        code.trim().length != 4){
        layer.msg('输入非法，请重新输入', {icon: 2});
         return
     }

     $.ajax({
         type: "post",
         url: ctx + "login",
         data: {
             "username": username,
             "password": password,
             "code": code,
         },
         dataType: "json",
         success: function (r) {
             if (r.code === 0) {
                 if(r.msg.length != 0){
                     location.href = r.msg;
                 }else{
                     location.href = ctx;
                 }
             } else {
                 layer.msg(r.msg, {icon: 2});
             }
         }
     });
 }