<!-- 上传组件包 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.9</version>
   </dependency>
 
 <!-- 夸服务器文件上传 -->
 <!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-client -->
 <dependency>
   <groupId>com.sun.jersey</groupId>
   <artifactId>jersey-client</artifactId>
   <version>1.18.6</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/com.sun.jersey/jersey-core -->
 <dependency>
   <groupId>com.sun.jersey</groupId>
   <artifactId>jersey-core</artifactId>
   <version>1.18.6</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-common -->
 <dependency>
   <groupId>org.glassfish.jersey.core</groupId>
   <artifactId>jersey-common</artifactId>
   <version>2.26</version>
 </dependency>

<form action="${pageContext.request.contextPath}/Abc/uploadImg.do" enctype="multipart/form-data" method="post">
 多个文件: <input type="file" name="fileList" multiple/>
 <input type="submit" value="提交" />
</form>

/**
 * 多文件，跨服务器上传
 * @param request
 * @return
 */
 @ResponseBody
 @RequestMapping("/uploadImg")
 public String fileUpload(MultipartHttpServletRequest request){
 JSONObject joson = new JSONObject();
 String serverAddress = "http://172.xxx.xxx.xxx:8080";//服务器地址
 String folder = "/upload/";//文件夹名称
 String fullPaths = "";//绝对路径
 String reletivePaths = "";//相对路径
 // 创建jesy服务器
 Client client = Client.create();
 // 获取文件名字
 Iterator<String> fileNames = request.getFileNames();
 List<String> fileNameList = new ArrayList<String>();
    List<String> relaPathList = new ArrayList<String>();
    List<String> realPathList = new ArrayList<String>();
 try {
  while (fileNames.hasNext()) {//判断多文件
  // 把fileNames集合中的值打出来
  String fileName = fileNames.next();
  // request.getFiles(fileName)方法即通过fileName这个Key, 得到对应的文件集合列表.
  // 只是在这个Map中, 文件被包装成MultipartFile类型
  List<MultipartFile> fileList = request.getFiles(fileName);
  if (fileList.size() > 0) {
   // 遍历文件列表
   Iterator<MultipartFile> fileIte = fileList.iterator();
   while (fileIte.hasNext()) {
   // 获得每一个文件
   MultipartFile multipartFile = fileIte.next();
   // 截取文件的后缀名（.jpg）
   String originalFilename = multipartFile.getOriginalFilename();//原始文件名
   String subString = originalFilename.substring(originalFilename.indexOf("."));//文件名后缀
   //System.out.println("原始文件名："+originalFilename+"；文件后缀名："+subString);
   // 将文件对象转换为字节
   byte[] fileBytes = multipartFile.getBytes();
   // 生成唯一的一个字符串名称（带后缀）
   String newFilename = UUID.randomUUID().toString()+subString;
   //System.out.println("唯一文件名（带后缀）："+newFilename);
   // 开始上传文件
   // 拼接保存的路径（相对路径）
   reletivePaths = folder+newFilename;
   // 拼接最终保存的路径（绝对对路径）
   fullPaths = serverAddress+reletivePaths;
   //把文件关联到远程服务器
   WebResource webResource = client.resource(fullPaths);
   // 上传
   webResource.put(String.class, fileBytes);
   fileNameList.add(newFilename);//文件名
           relaPathList.add(reletivePaths);//相对路径
           realPathList.add(fullPaths); //真实完整路径
   }
   joson.put("success", 1);
   joson.put("error", "");
   joson.put("fileNameList", fileNameList);
   joson.put("relaPathList", relaPathList);
   joson.put("realPathList", realPathList);
  } else {
   joson.put("success", 0);
   joson.put("error", "上传失败");
  }
  }
 } catch (UniformInterfaceException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  joson.put("success", 0);
  joson.put("error", "上传失败");
 } catch (ClientHandlerException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  joson.put("success", 0);
  joson.put("error", "上传失败");
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  joson.put("success", 0);
  joson.put("error", "上传失败");
 }
 return joson.toString();
 }

 <servlet>
    <servlet-name>default</servlet-name>
    <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
    <init-param>
      <param-name>debug</param-name>
      <param-value>0</param-value>
    </init-param>
 <!-- 上面是本来就有的 -->
    <!-- 允许文件读写 -->
 <init-param>
  <param-name>readonly</param-name>
      <param-value>false</param-value>
 </init-param>
    <!-- 下面也是本来有的 -->
    <init-param>
      <param-name>listings</param-name>
      <param-value>false</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>