POST提交較短字符串時沒問題，稍長字符串就顯示400錯誤，修改tomcat的server.xml沒用表單只有如下兩個字段，這個content長度就會報錯控制器代碼//處理新聞評論表單提交@RequestMapping(value = "/news", method = RequestMethod.POST)public String doReplyNews(@Validated NewsReplyFormBean newsReplyFormBean, @RequestParam("newsId") int newsId, BindingResult bindingResult, Model model, HttpSession httpSession){    //表單校驗出錯    if(bindingResult.hasErrors())    {        this.fillNewsPageContent(model, newsId);        return "news";    }    //表單校驗成功    else    {        User user = (User)httpSession.getAttribute("user");        //Session登陸校驗失敗        if(user == null)        {            this.fillNewsPageContent(model, newsId);            model.addAttribute("replyError", "請先登陸!");            return "news";        }        //登陸校驗成功        else        {            newsReplyFormBean.setContent(KeywordReplaceUtil.HTMLTageFilter(newsReplyFormBean.getContent()));            //將評論信息插入數(shù)據(jù)庫            userService.addNewsReply(newsReplyFormBean, (long)newsId, user.getUserId());            //組裝重定向URL            return  "redirect:news?id=" + newsId;        }    }}velocity里的表單<form role="form" action="news" method="post" id="form" onsubmit="return check();">    <input type="text" class="sr-only" name="newsId" value="${news.newsId}" />    <div class="form-group">        <label class="control-label sr-only" for="content"></label>        #springBind("newsReplyFormBean.content")        <textarea name="content" class="form-control" id="content" placeholder="說點什么..."></textarea>        <p class="help-block" style="color: red" id="reply_help"></p>        <p class="help-block" style="color: red">$!{replyError}</p>    </div>    <input type="submit" value="提交" /></form>還有個問題，不知道應該怎樣看到這類錯誤的錯誤日志