java 图片文件上传

上传按钮

 <input type=\"file\"  =\"uploadFile()\" id=\"file\" required=\"required\"><br>

js:

function uploadFile() {
	var formData = new FormData();
	var file = $(\"#file\").get(0).files[0];
	formData.append(\"file\", file);
	$.ajax({
		url:  Url + \"/YadjUpload/uploadFile.htm\",
		type: \"POST\",
		data: formData,
		contentType: false,
		//必须false才会避开jQuery对 formdata 的默认处理  HttpRequest会对 formdata 进行正确的处理            
		processData: false,
		//必须false才会自动加上正确的Content-Type            
		success: function(data) {
			$(\"#image1\").attr(\"src\",  Url + data);
		},
		error: function(error) {}
	});
}

java:

public String uploadFile(String imgUrl, HttpServletRequest request, String frontSuffix) {
	    if (frontSuffix == null){
	        frontSuffix = UUID.randomUUID().toString();
	    }        String realsavepath = request.getSession().getServletContext().getRealPath(imgUrl);
	    File savedir = new File(realsavepath);
	    // 如果目录不存在就创建
         if (!savedir.exists()) {
                  savedir.mkdirs();
	    } 
	        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
         MultipartFile multipartFile = multipartRequest.getFile(\"file\");
         String suffix = multipartFile.getOriginalFilename().substring(multipartFile.getOriginalFilename().lastIndexOf(\".\"));
         String logImageName = frontSuffix + suffix;
         // 构建文件名称        /** 拼成完整的文件保存路径加文件* */
         String fileName = realsavepath + File.separator + logImageName;
         File file = new File(fileName);
         try {
             multipartFile.transferTo(file);
             fileName = imgUrl + logImageName;
         } catch (Exception e) {
             // AJAX异常返回
              e.printStackTrace();
             }
             return fileName;
	}