<script type="text/javascript" src="resources/js/jquery-3.3.1.min.js"></script>  <script type="text/javascript" src="resources/js/ajaxFileUpload.js"></script>

 <!--使用springMVC上傳圖片 ajaxFileUpload-->  <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <property name="maxUploadSize" value="10485760" />  </bean>

 <input type="file" id="headImg" name="headImg"/>

function headImgUpload(){ //圖片上傳函數  var results = "";  var account = $("#account").val(); //account、identity 這兩個變量，根據我的需求會在后面用到，閱讀者可以根據自己的需求刪掉或者修改這兩個變量  var identity = $("input[name='identity']:checked").val();  $.ajaxFileUpload({    url:"register/headImgUpload?account="+account+"&identity="+identity,//根據url訪問controller層中的方法    secureuri:false,    fileElementId:"headImg", //<input>標簽中的id屬性    type:"POST",    dataType:"text", //服務器返回的數據類型    success:function (result) {      result = result.replace(/<pre.*?>/g, ''); //ajaxFileUpload會對服務器響應回來的text內容加上<pre style="....">text</pre>前后綴      result = result.replace(/<PRE.*?>/g, '');      result = result.replace("<PRE>", '');      result = result.replace("</PRE>", '');      result = result.replace("<pre>", '');      result = result.replace("</pre>", '');      result = JSON.parse(result);//轉換為json格式      results = result.result;      alert(result);    },    error:function (data,status,error) {      alert("失敗！！！"+error);    }  });}

@Controller@RequestMapping(value = "register")public class RegisterController {  //用戶頭像上傳  @RequestMapping(value = "/headImgUpload",method = RequestMethod.POST)  @ResponseBody  public Map<String,Object> headImgUpload(@RequestParam MultipartFile headImg, String account, String identity, HttpServletRequest request){    //上傳的結果    String result = "fail";    //頭像上傳到的位置    String imgRealPath = "";    try{      //確保上傳的圖片不為空      if(headImg != null && !headImg.isEmpty()){        //判斷注冊用戶的身份，商戶還是會員        if(identity.equals("member")){          //會員          imgRealPath = request.getSession().getServletContext().getRealPath("/resources/image/member");        }else if(identity.equals("businessman")){          //商戶          imgRealPath = request.getSession().getServletContext().getRealPath("/resources/image/businessman");        }        System.out.println(imgRealPath);//在控制臺打印一下路徑        //上傳完成后保存的文件名        String fileName= account + ".jpg";        //文件夾不存在的話，新建一個        File fileFolder = new File(imgRealPath);        if(!fileFolder.exists()){          fileFolder.mkdirs();        }        File file = new File(fileFolder,fileName);        //transferTo(),springMVC的方法，用于圖片上傳時，將內存中的圖片寫入磁盤        headImg.transferTo(file);//會報IO異常        result = "success";      }    }catch (IOException e){      e.printStackTrace();    }    Map<String,Object> resultMap = new HashMap<String,Object>();    resultMap.put("result",result);    return resultMap;  }}