图片的上传

这种不适合ajax操作，只适合单张图片的上传

//活动图片下部图片上传
function subFile2(){
    var file = document.getElementById('file3');
   if (file.value == "") {
       alert("请选择您需要上传的背景图片！");
      }else{
       var plantId=$(".plantId").val();
       var selVal= $(".activityTypeId").val();
       var activityId=$(".activityId").val();
       var packageId=$(".packageId").val();
       var f = document.getElementsByTagName("form")[0];
       var packageAmount=$(".packageAmount").val();
    f.action=f.action+"&plantId="+plantId+"&selVal="+selVal+"&activityId="+activityId+"&packageAmount="+packageAmount；
       f.submit();
         top.closeMD(true);
   }
}

后台代码

//转型为MultipartHttpRequest(重点的所在)
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        // 获得第1张图片（根据前台的name名称得到上传的文件）
        MultipartFile multipartFile =null;
        if("1".equals(String.valueOf(activityTypeId))){
             multipartFile = multipartRequest.getFile("aa");
        }else if("2".equals(String.valueOf(activityTypeId))){
           if("1".equals(uploadPhotoType)){
                   multipartFile = multipartRequest.getFile("bb");
           }else{
                   multipartFile = multipartRequest.getFile("cc");
           }
        }
        byte[] bytes = multipartFile.getBytes();

          String fileExt = "";// 后缀名
          String oldName = "";// 原文件名称
          String name = multipartFile.getOriginalFilename();
           // 扩展名格式：
           int lastIndex = name.lastIndexOf(".");
           if (lastIndex >= 0) {
               fileExt = name.substring(lastIndex + 1);
               oldName = name.substring(0, lastIndex);
           }
       String userRealPath=null;//真正路径
       File originalfile = null;
       String serverRealPath = SystemConfiguration.getImageServerRealPath(ado);//真正的路径
       String domain = SystemConfiguration.getImageDomain(ado);
       if("1".equals(String.valueOf(activityTypeId))){
           userRealPath = "/images/plantActivity/"+plantId+"/"+activityTypeId+"/"+oldName+"."+fileExt;// 上传活动背景图片的路径
       }else if("2".equals(String.valueOf(activityTypeId))){
           if("1".equals(uploadPhotoType)){
               userRealPath = "/images/plantActivity/"+plantId+"/"+activityTypeId+"/topImg."+fileExt;//上传活动背景上部图片的路径
           }else{
               userRealPath="/images/plantActivity/"+plantId+"/"+activityTypeId+"/activeImg1."+fileExt;//套餐图片路径
           }
       }

       File dir = new File(serverRealPath + userRealPath);
       if (!dir.exists()) {
           dir.mkdirs();
       }
       // 生成文件名：serverRealPath + userRealPath
       originalfile = new File(serverRealPath + userRealPath);
       try {
           multipartFile.transferTo(originalfile);// 写到磁盘

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