Java通过jersey实现客户端图片上传示例

 <dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-client</artifactId>
    <version>1.2</version>
 </dependency>

<!--  readonly      Is this context "read only", so HTTP    -->
<!--            commands like PUT and DELETE are      -->
<!--            rejected? [true]             -->

<servlet>
  <servlet-name>default</servlet-name>
  <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
  <!-- 添加，解决jersey上传服务器403错误 -->
  <init-param>
    <param-name>readonly</param-name>
    <param-value>false</param-value>
  </init-param>
  <init-param>
    <param-name>debug</param-name>
    <param-value>0</param-value>
  </init-param>
  <init-param>
    <param-name>listings</param-name>
    <param-value>false</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>

@Controller
@RequestMapping("/upload")
public class UploadController extends BaseController {
  @RequestMapping(value = "/uploadPic", method = RequestMethod.POST)
  @LoginCheck
  public void uploadPic(HttpServletRequest request, PrintWriter out, String lastRealPath) throws IOException {
    // 将当前上下文初始化给CommonsMultipartResolver
    CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
    // 检查form中是否有enctype＝"multipart／form－data"
    if (resolver.isMultipart(request)) {
      // 强制转化request
      MultipartHttpServletRequest req = (MultipartHttpServletRequest) request;
      // 从表单获取input名称
      Iterator<String> iterable = req.getFileNames();
      // 存在文件
      if (iterable.hasNext()) {
        String inputName = iterable.next();
        // 获得文件
        MultipartFile mf = req.getFile(inputName);
        byte[] mfs = mf.getBytes();
        // 定义文件名
        String fileName = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
        Random random = new Random();
        for (int i = 0; i < 3; i++) {
          fileName = fileName + random.nextInt(10);
        }
        // 获得后缀名
        String oriFileName = mf.getOriginalFilename();
        String suffix = oriFileName.substring(oriFileName.lastIndexOf("."));

        // 要上传文件的绝对路径
        String realPath = MallUtil.readProp("upload_file_path") + "/upload/" + fileName + suffix;
        String relativePath = "/upload/" + fileName + suffix;

        // 由于我们要在不同主机上上传文件，所以不能直接通过流的方式来写，需要通过webService来完成，这边借助Jersey来完成
        Client client = Client.create();

        // 判断是不是第一次上传，如果已经上传过则删除上一次上传的文件
       if (StringUtils.isNotBlank(lastRealPath)) {
         WebResource webService = client.resource(lastRealPath);
         webService.delete();
       }
       WebResource webService = client.resource(realPath);
       // 将文件传到主机上
       webService.put(mfs);
       // 将图片信息返回给界面回显
       Map<String, String> map = new HashMap<String, String>();
       map.put("realPath", realPath);
       map.put("relativePath", relativePath);
       // {"relativePath":"/upload/20170215135233634679.png","realPath":"http://localhost:8088/mall-file/upload/20170215135233634679.png"}
       out.write(JsonUtil.jsonString(map));
      }
    }
  }
}

<form enctype="multipart/form-data" id="form">   
<div>
  ![](${path}/mall/image/load_image.png)
  <input type="file" id="input-image" name="input-image" onchange="submitUpload()">
  <input id="input-relative-path" name="imgs" type="hidden" >
  <input id="input-last-path" type="hidden">
 </div>
</form>

function submitUpload() {
  var option = {
    url: path + "/upload/uploadPic.do",
    type: "post",
    dataType: "text", // 返回值的数据类型
    beforeSubmit: function (formData, jqForm, options) {
      var imageValue = $("#input-image").val();
      imageValue = $.trim(imageValue);
      return (imageValue != ""); // 没有选择图片，则中断上传请求
    },
    success: function (responseText) {
      // {"relativePath":"/upload/20170215135233634679.png","realPath":"http://localhost:8088/mall-file/upload/20170215135233634679.png"}
      var jsonObj = $.parseJSON(responseText);
      $("#image").attr("src", jsonObj.realPath);
      $("#input-relative-path").val(jsonObj.relativePath);
      $("#input-last-path").val(jsonObj.realPath);
    },
    error: function () {
      alert("系统错误");
    }
  }; 
  $("#form").ajaxSubmit(option);
}