通過 http post 方式上傳多張圖片

客戶端一：下面為 Android 客戶端的實現代碼：

/**
  * android上傳文件到服務器
  * 
  * 下面為 http post 報文格式
  * 
 POST/logsys/home/uploadIspeedLog!doDefault.html HTTP/1.1 
　　 Accept: text/plain, 
　　 Accept-Language: zh-cn 
　　 Host: 192.168.24.56
　　 Content-Type:multipart/form-data;boundary=-----------------------------7db372eb000e2
　　 User-Agent: WinHttpClient 
　　 Content-Length: 3693
　　 Connection: Keep-Alive   注：上面為報文頭
　　 -------------------------------7db372eb000e2
　　 Content-Disposition: form-data; name="file"; filename="kn.jpg"
　　 Content-Type: image/jpeg
　　 (此處省略jpeg文件二進制數據...）
　　 -------------------------------7db372eb000e2--
  * 
  * @param picPaths
  *            需要上傳的文件路徑集合
  * @param requestURL
  *            請求的url
  * @return 返回響應的內容
  */
 public static String uploadFile(String[] picPaths, String requestURL) {
  String boundary = UUID.randomUUID().toString(); // 邊界標識 隨機生成
  String prefix = "--", end = "\r\n";
  String content_type = "multipart/form-data"; // 內容類型
  String CHARSET = "utf-8"; // 設置編碼
  int TIME_OUT = 10 * 10000000; // 超時時間
  try {
   URL url = new URL(requestURL);
   HttpURLConnection conn = (HttpURLConnection) url.openConnection();
   conn.setReadTimeout(TIME_OUT);
   conn.setConnectTimeout(TIME_OUT);
   conn.setDoInput(true); // 允許輸入流
   conn.setDoOutput(true); // 允許輸出流
   conn.setUseCaches(false); // 不允許使用緩存
   conn.setRequestMethod("POST"); // 請求方式
   conn.setRequestProperty("Charset", "utf-8"); // 設置編碼
   conn.setRequestProperty("connection", "keep-alive");
   conn.setRequestProperty("Content-Type", content_type + ";boundary=" + boundary);
   /**
    * 當文件不為空，把文件包裝並且上傳
    */
   OutputStream outputSteam = conn.getOutputStream();
   DataOutputStream dos = new DataOutputStream(outputSteam);
    
   StringBuffer stringBuffer = new StringBuffer();
   stringBuffer.append(prefix);
   stringBuffer.append(boundary);
   stringBuffer.append(end);
   dos.write(stringBuffer.toString().getBytes());
    
   String name = "userName";
   dos.writeBytes("Content-Disposition: form-data; name=\"" + name + "\"" + end);
   dos.writeBytes(end);
   dos.writeBytes("zhangSan");
   dos.writeBytes(end);
 
    
   for(int i = 0; i < picPaths.length; i++){
   File file = new File(picPaths[i]);
    
   StringBuffer sb = new StringBuffer();
   sb.append(prefix);
   sb.append(boundary);
   sb.append(end);
   
   /**
    * 這里重點注意： name里面的值為服務器端需要key 只有這個key 才可以得到對應的文件
    * filename是文件的名字，包含后綴名的 比如:abc.png
    */
   sb.append("Content-Disposition: form-data; name=\"" + i + "\"; filename=\"" + file.getName() + "\"" + end);
   sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + end);
   sb.append(end);
   dos.write(sb.toString().getBytes());
   
   InputStream is = new FileInputStream(file);
   byte[] bytes = new byte[8192];//8k
   int len = 0;
   while ((len = is.read(bytes)) != -1) {
    dos.write(bytes, 0, len);
   }
   is.close();
   dos.write(end.getBytes());//一個文件結束標志
  }
   byte[] end_data = (prefix + boundary + prefix + end).getBytes();//結束 http 流 
   dos.write(end_data);
   dos.flush();
   /**
    * 獲取響應碼 200=成功 當響應成功，獲取響應的流
    */
   int res = conn.getResponseCode();
   Log.e("TAG", "response code:" + res);
   if (res == 200) {
    return SUCCESS;
   }
  } catch (MalformedURLException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  return FAILURE;
 }

服務端一：下面為 Java Web 服務端 servlet 的實現代碼：

public class FileImageUploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private ServletFileUpload upload;
    private final long MAXSize = 4194304 * 2L;// 4*2MB
    private String filedir = null;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public FileImageUploadServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * 設置文件上傳的初始化信息
     * 
     * @see Servlet#init(ServletConfig)
     */
    public void init(ServletConfig config) throws ServletException {
        FileItemFactory factory = new DiskFileItemFactory();// Create a factory
                                                            // for disk-based
                                                            // file items
        this.upload = new ServletFileUpload(factory);// Create a new file upload
                                                        // handler
        this.upload.setSizeMax(this.MAXSize);// Set overall request size
                                                // constraint 4194304
        filedir = config.getServletContext().getRealPath("images");
        System.out.println("filedir=" + filedir);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    @SuppressWarnings("unchecked")
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        PrintWriter out = response.getWriter();
        try {
            // String userName = request.getParameter("userName");//獲取form
            // System.out.println(userName);

            List<FileItem> items = this.upload.parseRequest(request);
            if (items != null && !items.isEmpty()) {
                for (FileItem fileItem : items) {
                    String filename = fileItem.getName();
                    if (filename == null) {// 說明獲取到的可能為表單數據,為表單數據時要自己讀取
                        InputStream formInputStream = fileItem.getInputStream();
                        BufferedReader formBr = new BufferedReader(new InputStreamReader(formInputStream));
                        StringBuffer sb = new StringBuffer();
                        String line = null;
                        while ((line = formBr.readLine()) != null) {
                            sb.append(line);
                        }
                        String userName = sb.toString();
                        System.out.println("姓名為：" + userName);
                        continue;
                    }
                    String filepath = filedir + File.separator + filename;
                    System.out.println("文件保存路徑為:" + filepath);
                    File file = new File(filepath);
                    InputStream inputSteam = fileItem.getInputStream();
                    BufferedInputStream fis = new BufferedInputStream(inputSteam);
                    FileOutputStream fos = new FileOutputStream(file);
                    int f;
                    while ((f = fis.read()) != -1) {
                        fos.write(f);
                    }
                    fos.flush();
                    fos.close();
                    fis.close();
                    inputSteam.close();
                    System.out.println("文件：" + filename + "上傳成功!");
                }
            }
            System.out.println("上傳文件成功!");
            out.write("上傳文件成功!");
        } catch (FileUploadException e) {
            e.printStackTrace();
            out.write("上傳文件失敗:" + e.getMessage());
        }
    }

}

 

客戶端二：下面為用 .NET 作為客戶端實現的 C# 代碼：

/** 下面為 http post 報文格式
     POST/logsys/home/uploadIspeedLog!doDefault.html HTTP/1.1 
　　 Accept: text/plain, 
　　 Accept-Language: zh-cn 
　　 Host: 192.168.24.56
　　 Content-Type:multipart/form-data;boundary=-----------------------------7db372eb000e2
　　 User-Agent: WinHttpClient 
　　 Content-Length: 3693
　　 Connection: Keep-Alive   注：上面為報文頭
　　 -------------------------------7db372eb000e2
　　 Content-Disposition: form-data; name="file"; filename="kn.jpg"
　　 Content-Type: image/jpeg
　　 (此處省略jpeg文件二進制數據...）
　　 -------------------------------7db372eb000e2--
         * 
         * */
        private STATUS uploadImages(String uri)
        {
            String boundary = "------------Ij5ei4ae0ei4cH2ae0Ef1ei4Ij5gL6";; // 邊界標識
      String prefix = "--", end = "\r\n";
            /** 根據uri創建WebRequest對象**/
            WebRequest httpReq = WebRequest.Create(new Uri(uri));
            httpReq.Method = "POST";//方法名   
            httpReq.Timeout = 10 * 10000000;//超時時間
            httpReq.ContentType = "multipart/form-data; boundary=" + boundary;//數據類型
            /*******************************/
  try {
            /** 第一個數據為form，名稱為par，值為123 */
   StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.Append(prefix);
            stringBuilder.Append(boundary);
            stringBuilder.Append(end);
   String name = "userName";
            stringBuilder.Append("Content-Disposition: form-data; name=\"" + name + "\"" + end);
            stringBuilder.Append(end);
            stringBuilder.Append("zhangSan");
            stringBuilder.Append(end);
            /*******************************/
            Stream steam = httpReq.GetRequestStream();//獲取到請求流
            byte[] byte8 = Encoding.UTF8.GetBytes(stringBuilder.ToString());//把form的數據以二進制流的形式寫入
            steam.Write(byte8, 0, byte8.Length);
 
            /** 列出 G:/images/ 文件夾下的所有文件**/
   DirectoryInfo fileFolder = new DirectoryInfo("G:/images/");
            FileSystemInfo[] files = fileFolder.GetFileSystemInfos();
            for(int   i = 0;   i < files.Length; i++) 
　　　　    { 
　　　　　　  FileInfo   file   =   files[i]   as   FileInfo;
              stringBuilder.Clear();//清理
              stringBuilder.Append(prefix);
              stringBuilder.Append(boundary);
              stringBuilder.Append(end);
              /**
              * 這里重點注意： name里面的值為服務器端需要key 只有這個key 才可以得到對應的文件
              * filename是文件的名字，包含后綴名的 比如:abc.png
              */
              stringBuilder.Append("Content-Disposition: form-data; name=\"" + i + "\"; filename=\"" + file.Name + "\"" + end);
              stringBuilder.Append("Content-Type: application/octet-stream; charset=utf-8" + end);
              stringBuilder.Append(end);
              byte[] byte2 = Encoding.UTF8.GetBytes(stringBuilder.ToString());
              steam.Write(byte2, 0, byte2.Length);
              FileStream fs = new FileStream(file.FullName, FileMode.Open, FileAccess.Read);//讀入一個文件。
              BinaryReader r = new BinaryReader(fs);//將讀入的文件保存為二進制文件。
              int bufferLength = 8192;//每次上傳8k；
              byte[] buffer = new byte[bufferLength];
              long offset = 0;//已上傳的字節數
              int size = r.Read(buffer, 0, bufferLength);
              while (size > 0)
              {
                  steam.Write(buffer, 0, size);
                  offset += size;
                  size = r.Read(buffer, 0, bufferLength);
              }
              /** 每個文件結束后有換行 **/
              byte[] byteFileEnd = Encoding.UTF8.GetBytes(end);
              steam.Write(byteFileEnd, 0, byteFileEnd.Length);
              fs.Close();
              r.Close();
            }
            byte[] byte1 = Encoding.UTF8.GetBytes(prefix + boundary + prefix + end);//文件結束標志
            steam.Write(byte1, 0, byte1.Length);
            steam.Close();
            WebResponse response = httpReq.GetResponse();// 獲取響應
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);// 顯示狀態
            steam = response.GetResponseStream();//獲取從服務器返回的流
            StreamReader reader = new StreamReader(steam);
            string responseFromServer = reader.ReadToEnd();//讀取內容
            Console.WriteLine(responseFromServer);
            // 清理流
            reader.Close();
            steam.Close();
            response.Close();
            return STATUS.SUCCESS;
  } catch (System.Exception e) {
            Console.WriteLine(e.ToString());
            return STATUS.FAILURE;
  } 
}

服務端二： 下面為 .NET 實現的服務端 C# 代碼：

protected void Page_Load(object sender, EventArgs e)
{
   string userName = Request.Form["userName"];//接收form
   HttpFileCollection MyFilecollection = Request.Files;//接收文件
   for (int i = 0; i < MyFilecollection.Count; i++ )
   {
      MyFilecollection[i].SaveAs(Server.MapPath("~/netUploadImages/" + MyFilecollection[i].FileName));//保存圖片
   }
}

貼碼結束！！！