springmvc+ajax文件上传

环境:JDK6以上，这里我是用JDK8，mysql57,maven项目

框架环境:spring+springmvc+mybaits或spring+springmvc+mybatis plus

前端代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ajax文件上传</title>
<script src="../js/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
function savePic(){
    alert("进来了");
    var formData = new FormData($( "#uploadPic" )[0]);
    var ajaxUrl = "/LMS/user/saveHeaderPic";
    //alert(ajaxUrl);
    //$('#uploadPic').serialize() 无法序列化二进制文件，这里采用formData上传
    //需要浏览器支持：Chrome 7+、Firefox 4+、IE 10+、Opera 12+、Safari 5+。
    $.ajax({
        type: "POST",
        url: ajaxUrl,
        data: formData,
        async: false,
        cache: false,
        contentType: false,
        processData: false,
        success: function (data) {
            alert("成功");
        alert(data);
        },
        error: function(data) {
            alert("error:"+data.responseText);

         }
    });
    return false;
}
</script>
</head> 

<body>
<form id="uploadPic" action="#" enctype="multipart/form-data">
    <input type="file" name="file">
    <a href="#" class="btn green" onclick="savePic();"> 提交 </a>
</form>
</body>
</html> 

后台Controller

/**
 * 系统用户基本信息表
 */
@RestController
@RequestMapping("/user")
public class UserController {

    /**
     * 头像图片上传
     * @throws IOException
     */
    @RequestMapping(value = "/saveHeaderPic", method = RequestMethod.POST)
    public void saveHeaderPic(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request, HttpServletResponse response) throws IOException {

            String resMsg = "";
        try {

            long  startTime=System.currentTimeMillis();

            System.out.println("fileName："+file.getOriginalFilename());
            String path="E:\\Demo\\workspace\\images\\"+new Date().getTime()+file.getOriginalFilename();
            System.out.println("path:" + path);

            File newFile=new File(path);
            //通过CommonsMultipartFile的方法直接写文件
            file.transferTo(newFile);
            long  endTime=System.currentTimeMillis();
            System.out.println("运行时间："+String.valueOf(endTime-startTime)+"ms");
            resMsg = "1";
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            resMsg = "0";
        }
              response.getWriter().write(resMsg);

          }

}