JAVA 提交form表单 后台获取不到参数及乱码问题

        <form class="form-horizontal m-t" id="commentForm" method="post" enctype="multipart/form-data">

            <div class="form-group">
                <label class="col-sm-2 control-label" style="float:left;"><font>标题：</font></label>
                <div class="col-sm-6">
                    <input id="newsTitle" name="newsTitle" minlength="2" type="text" class="form-control" required="" aria-required="true" value="">
                </div>
            </div>
            <div class="form-group">
                <label class="col-sm-2 control-label" style="float:left;"><font>关键词：</font></label>
                <div class="col-sm-6">
                    <input id="keywords" name="keywords" minlength="2" type="text" class="form-control" required="" aria-required="true" value="">
                </div>
            </div>
            <div class="form-group">
                <label class="col-sm-2 control-label" style="float:left;"><font>描述：</font></label>
                <div class="col-sm-6">
                    <input id="description" name="description" minlength="2" type="text" class="form-control" required="" aria-required="true" value="">
                </div>
            </div>
            <div class="form-group">
                <label class="col-sm-2 control-label" style="float:left;"><font>详细：</font></label>
                <div class="col-sm-6">
                    <textarea id="newsContent" name="newsContent" minlength="2" rows="4" type="text" class="form-control"></textarea>
                    <script type="text/javascript">CKEDITOR.replace(‘newsContent‘)</script>
                </div>
            </div>
            <div class="form-group">
                <div class="col-sm-6 col-sm-offset-2">
                    <button class="btn btn-primary" type="submit" onclick="return btnsubmit()">提交</button>
                    <button class="btn btn-danger" type="button" id="cancel">取消</button>
                </div>
            </div>
        </form>

这是我的表单提交代码，当然在提交的手利用js来改变acction，重点是提交进入控制器之后居然得不到参数，我后台是利用对象直接获取的参数

    @RequestMapping(value="/AddorEdit",produces = {"application/text;charset=UTF-8"})
    public String AddorEdit(NewsManager model,HttpServletRequest request)throws ServletException, IOException
    {
        request.setCharacterEncoding("UTF-8");
        String userName = request.getParameter("newsTitle");
        var user = ManageProvider.getProvider().Current(request);
        if (user==null||user.getId()==0)
        {
            return "login/login";
        }
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        java.util.Date time=null;
        try {
            time= df.parse(df.format(new Date()));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        model.setCreateDate(time);
        model.setCreateName(user.getUserName());
        model.setState(1);
        ApplicationContext ctx = new ClassPathXmlApplicationContext(
                "file:D:/Program Files/JetBrains/javaproject08/web/WEB-INF/applicationContext.xml");
        NewsManagerServiceImpl newsmanagerserviceimpl=(NewsManagerServiceImpl)ctx.getBean("newsManagerservice");
        newsmanagerserviceimpl.insertNewsManager(model);
        return "news/newsindex";
    }

解决办法:前台页面代码中多了个

enctype="multipart/form-data"这个属性 去掉了就可以了然后就是传过来的参数乱码了

我在控制器添加

@RequestMapping(value="/AddorEdit",produces = {"application/text;charset=UTF-8"}),页面也添加了编码

<%@ page contentType="text/html;charset=UTF-8" language="java" %><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />还有许多网上提到的

request.setCharacterEncoding("UTF-8");说是加段这个就可以了，但在我的项目中没用最后再网站上看到了在web.xml中加入这样一段代码（推荐放在最前面，我的就是这样好的）完美解决了

    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

原文地址：https://www.cnblogs.com/Argus-sqh/p/12707520.html