上傳所用httpclient版本為4.5.1

客戶端：

/**
     * 模擬表單上傳檔案
     * postFile 上傳的檔案
     * postUrl  請求地址
     * postParam 其他表單的請求引數
     */
    public static Map<String,Object> uploadFileByHTTP(File postFile,String postUrl,Map<String,String> postParam){
        Map<String,Object> resultMap = new HashMap<String,Object>();
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try{
            //把一個普通引數和檔案上傳給下面這個地址    是一個servlet
            HttpPost httpPost = new HttpPost(postUrl);
            //把檔案轉換成流物件FileBody
            FileBody fundFileBin = new FileBody(postFile);
            //設定傳輸引數,設定編碼。設定瀏覽器相容模式，解決檔名亂碼問題
            MultipartEntityBuilder multipartEntity = MultipartEntityBuilder.create().setCharset(Charset.forName("UTF-8")).setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            multipartEntity.addPart(postFile.getName(), fundFileBin);//相當於<input type="file" name="media"/>
            //設計檔案以外的引數
            Set<String> keySet = postParam.keySet();
            for (String key : keySet) {
                //相當於<input type="text" name="name" value=name>
                multipartEntity.addPart(key, new StringBody(postParam.get(key), ContentType.create("text/plain", Consts.UTF_8)));
            }

            HttpEntity reqEntity =  multipartEntity.build();
            httpPost.setEntity(reqEntity);

            //發起請求   並返回請求的響應
            CloseableHttpResponse response = httpClient.execute(httpPost);
            try {
                //列印響應狀態
                resultMap.put("statusCode", response.getStatusLine().getStatusCode());
                //獲取響應物件
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    //列印響應長度
                    //列印響應內容
                    resultMap.put("data", EntityUtils.toString(resEntity,Charset.forName("UTF-8")));
                }
                //銷燬
                EntityUtils.consume(resEntity);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                response.close();
            }
        } catch (ClientProtocolException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        } finally{
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultMap;
    }
 

服務端：

/**
     * 將request中的檔案儲存
     * @param request 
     * @return 檔名對應檔案路徑的map
     */
    @Override
    public Map<String, String> fileUpload(HttpServletRequest request)
        throws IllegalStateException, IOException
    {
        Map<String, String> map = new HashMap<String, String>();

        // 將當前上下文初始化給 CommonsMutipartResolver （多部分解析器）
        CommonsMultipartResolver multipartResolver =
            new CommonsMultipartResolver(request.getSession().getServletContext());
        // 檢查form中是否有enctype="multipart/form-data"
        if (multipartResolver.isMultipart(request))
        {
            // 將request變成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
            // 獲取multiRequest 中所有的檔名
            Iterator<String> iter = multiRequest.getFileNames();

            // 定義絕對路徑
            String localPath = "c:\\upfile";
            File path = new File(localPath);
            // 資料夾不存在 則建立資料夾
            if (!path.exists())
            {
                path.mkdir();
            }

            while (iter.hasNext())
            {
                // 一次遍歷所有檔案
                MultipartFile file = multiRequest.getFile(iter.next().toString());
                if (file != null)
                {
                    // 名稱生成規則 當前時間戳_隨機數_檔名
                    Random random = new Random();
                    int rand = random.nextInt(100);
                    String filepath = localPath + new Date().getTime() + "_" + rand + "_" + file.getOriginalFilename();
                    // 上傳
                    file.transferTo(new File(filepath));
                    // 檔案資料儲存起來
                    map.put(file.getOriginalFilename(), filepath);
                }
            }

        }

        return map;

    }