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});
            }
        }
    });
}