jersey框架下上传form表单出错

前端form

 <form id="picForm" action="/intelligentStage-system-manage/rest/admin/addimage" method="post" enctype="multipart/form-data">  
            <label style="margin-top: 30px;">用户名：</label> 
            <input type="text" id="adminName" name="adminName" />   <br>
            <img src="" id="showPhoto" style="float: right;width: 100px;height: 100px;margin-right: 40px;" />
            <label>密码：</label> 
            <input type="password" id="password" name="password" /> <br>
            <label>确认密码：</label> 
            <input type="password" id="confirm" />  <br>
            <label>姓名：</label> 
            <input type="text" id="name" name="name" /> <br>
            <label>性别：</label> 
            <select id="sex" name="sex" style="width: 100px;height: 30px;">
                              <option value="1">男</option>
                              <option value="2">女</option>
             </select>  <br>

            <input id="photo" name="photo"   type="file" style="float: right;margin-right: 60px;" value="添加照片"/>
            <label>生日：</label> 
            <input type="text" id="birth" name="birth" onClick="WdatePicker()"  clientidmode="Static" /> <br>
            <label>联系方式：</label> 
            <input type="text" id="contact" name="contact" /><br>
            <label>入职时间：</label> 
            <input type="text" id="entryTime" name="entryTime" onClick="WdatePicker()"  clientidmode="Static" />    <br>
            <label>微信：</label> 
            <input type="text" id="wechat" name="wechat" /> <br>
            <label>公司名称：</label> 
            <select id="company" name="company" style="width: 100px;height: 30px;">
                              <option value="0">不限</option>
             </select>  <br>
            <label>备注：</label> 
            <input type="text" id="content" name="content" />   <br>

             <input type="submit" value="上传" /> 
            </form>

后台接收
@POST
@Path("/addimage")
@Produces(MediaType.TEXT_PLAIN)
@Consumes("multipart/form-data")
public String addimage(FormDataMultiPart formDataMultiPart) throws UnsupportedEncodingException{
return null;
}

但是前端会报错
POST http://192.168.223.31:8080/intelligentStage-system-manage/rest/admin/addimage 415 (Unsupported Media Type)
请大神解释一下，谢谢

http://www.cnblogs.com/fantiantian/p/3600925.html