SpringMVC上传图片代码实例

<div class="container-fluid">
    <!-- <div id="panel-advancedoptions"> -->
      <div class="row">
        <div class="col-md-12">
          <div class="panel panel-midnightblue">
            <div class="panel-heading">
              <h2>修改头像</h2>
            </div>
            <div class="panel-body">
                <div class="row">
                  <div class="col-md-1">
                    <button type="button" class="btn btn-primary btn-sm" id="btn_upload" >
                      <span class="fa fa-upload"></span> 上传头像图片
                    </button>
                  </div>
                  <div class="col-md-11">
                      <h5></h5>（仅限上传单张10M以下png、jpg图片）</h5>
                      <input type="file" class="hidden" id="InputFile" />
                  </div>
                </div>
                </br>
                <div class="row">
                  <div class="col-md-6">
                    <img src="images/UserAvatars/robo.jpg" class="img-thumbnail uploadImges" >
                  </div>                  
                </div>
            </div>
          </div>
        </div>
      </div>       
    <!-- </div> -->
</div>

$("#btn_upload").click(function(){
        $("#InputFile").trigger("click");
        openUploads("InputFile");
      });
      function openUploads(id){
        $("#"+id).unbind().change(function(){
          var formdata = new FormData();
          formdata.append('file',$("#"+id)[0].files[0]); //获取图片信息
          //console.log($("#"+id)[0].files[0]);
          $.ajax({
            type: 'POST',
            url: "http://localhost:8078/lifeTrackDB/UploadUserAvatars",
            data:formdata,
            cache:false,
            dataType: 'json',
            processData:false,
            contentType:false,
            success : function (result)
            {
              console.log(result);
              if (result.status)
              {
                //$('#'+id).attr('src','images/UserAvatars/'+result.message);
                alert(result.message);
              }
              else
              {
                $.alert(result.message,'');
              }
            }
          });
        });
      }

@RequestMapping(value="/UploadUserAvatars")
@ResponseBody
public void UploadUserAvatars(HttpServletRequest request,HttpServletResponse response,
       @RequestParam(value = "file") List<MultipartFile> files) throws Exception{
     
    String path=System.getProperty("user.dir");
    
  if (null != files || 0 != files.size()) { 
    for(MultipartFile file:files) {
      //System.err.println("文件名：" + file.getOriginalFilename() + "---contentType：" + file.getContentType()); 
      file.transferTo(new File(path+"/UserAvatars/"+file.getOriginalFilename()));
      response.getWriter().write("{\"status\": true, \"code\": \"200\",\"message\":\"上传成功\"}");
    }
    }else {
      //response.getWriter().write("handleCallback({\"status\": false, \"code\": \"200\",\"message\":\"上传失败\"})");
      response.getWriter().write("{\"status\": false, \"code\": \"200\",\"message\":\"上传失败\"}");
    }    
}