使用HttpURLConnection上傳多個圖像文件

Question

我想使用HttpURLConnection上傳多重圖像文件，並且圖像數量不固定從android上傳多少文件。

請不要發送MultiPartEntity.I的鏈接，只想使用HttpURLConnection完成此操作，並且不希望使用任何其他外部庫來上傳文件。

我想用HttpURLConnection類例如請參考以下鏈接

http://www.17od.com/2010/02/18/multipart-form-upload-on-android/

這是單個文件上傳代碼，我要上傳多個

並請PHP腳本的例子來上傳文件。

Answer 1

是的，最後我得到了答案。

在android側。

Fileuploader.java

public class FileUploader { 
    private final String boundary; 
    private static final String LINE_FEED = "\r\n"; 
    private HttpURLConnection httpConn; 
    private String charset; 
    private OutputStream outputStream; 
    private PrintWriter writer; 

    public FileUploader(String requestURL, String charset) 
      throws IOException { 
     this.charset = charset; 

     // creates a unique boundary based on time stamp 
     boundary = "===" + System.currentTimeMillis() + "==="; 

     URL url = new URL(requestURL); 
     httpConn = (HttpURLConnection) url.openConnection(); 
     httpConn.setUseCaches(false); 
     httpConn.setDoOutput(true); // indicates POST method 
     httpConn.setDoInput(true); 
     httpConn.setRequestProperty("Content-Type", 
       "multipart/form-data; boundary=" + boundary); 
     httpConn.setRequestProperty("User-Agent", "CodeJava Agent"); 
     httpConn.setRequestProperty("Test", "Bonjour"); 
     outputStream = httpConn.getOutputStream(); 
     writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), 
       true); 
    } 

    /** 
    * Adds a form field to the request 
    * @param name field name 
    * @param value field value 
    */ 
    public void addFormField(String name, String value) { 
     writer.append("--" + boundary).append(LINE_FEED); 
     writer.append("Content-Disposition: form-data; name=\"" + name + "\"") 
       .append(LINE_FEED); 
     writer.append("Content-Type: text/plain; charset=" + charset).append(
       LINE_FEED); 
     writer.append(LINE_FEED); 
     writer.append(value).append(LINE_FEED); 
     writer.flush(); 
    } 

    /** 
    * Adds a upload file section to the request 
    * @param fieldName name attribute in <input type="file" name="..." /> 
    * @param uploadFile a File to be uploaded 
    * @throws IOException 
    */ 
    public void addFilePart(String fieldName, File uploadFile) 
      throws IOException { 
     String fileName = uploadFile.getName(); 
     writer.append("--" + boundary).append(LINE_FEED); 
     writer.append(
       "Content-Disposition: form-data; name=\"" + fieldName 
         + "\"; filename=\"" + fileName + "\"") 
       .append(LINE_FEED); 
     writer.append(
       "Content-Type: " 
         + URLConnection.guessContentTypeFromName(fileName)) 
       .append(LINE_FEED); 
     writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED); 
     writer.append(LINE_FEED); 
     writer.flush(); 

     FileInputStream inputStream = new FileInputStream(uploadFile); 
     byte[] buffer = new byte[4096]; 
     int bytesRead = -1; 
     while ((bytesRead = inputStream.read(buffer)) != -1) { 
      outputStream.write(buffer, 0, bytesRead); 
     } 
     outputStream.flush(); 
     inputStream.close(); 

     writer.append(LINE_FEED); 
     writer.flush(); 
    } 

    /** 
    * Adds a header field to the request. 
    * @param name - name of the header field 
    * @param value - value of the header field 
    */ 
    public void addHeaderField(String name, String value) { 
     writer.append(name + ": " + value).append(LINE_FEED); 
     writer.flush(); 
    } 

    /** 
    * Completes the request and receives response from the server. 
    * @return a list of Strings as response in case the server returned 
    * status OK, otherwise an exception is thrown. 
    * @throws IOException 
    */ 
    public List<String> finish() throws IOException { 
     List<String> response = new ArrayList<String>(); 

     writer.append(LINE_FEED).flush(); 
     writer.append("--" + boundary + "--").append(LINE_FEED); 
     writer.close(); 

     // checks server's status code first 
     int status = httpConn.getResponseCode(); 
     if (status == HttpURLConnection.HTTP_OK) { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        httpConn.getInputStream())); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       response.add(line); 
      } 
      reader.close(); 
      httpConn.disconnect(); 
     } else { 
      throw new IOException("Server returned non-OK status: " + status); 
     } 

     return response; 
    } 
} 

在mainactivity文件

在mainactivity.java只是調用這個函數和imgPaths是圖像路徑的陣列。

public void uploadFile(ArrayList<String> imgPaths) { 

     String charset = "UTF-8"; 
     //File uploadFile1 = new File("e:/Test/PIC1.JPG"); 
     //File uploadFile2 = new File("e:/Test/PIC2.JPG"); 

     File sourceFile[] = new File[imgPaths.size()]; 
     for (int i=0;i<imgPaths.size();i++){ 
      sourceFile[i] = new File(imgPaths.get(i)); 
      // Toast.makeText(getApplicationContext(),imgPaths.get(i),Toast.LENGTH_SHORT).show(); 
     } 

     String requestURL = "your API"; 

     try { 
      FileUploader multipart = new FileUploader(requestURL, charset); 

      multipart.addHeaderField("User-Agent", "CodeJava"); 
      multipart.addHeaderField("Test-Header", "Header-Value"); 

      multipart.addFormField("description", "Cool Pictures"); 
      multipart.addFormField("keywords", "Java,upload,Spring"); 

      for (int i=0;i<imgPaths.size();i++){ 
       multipart.addFilePart("uploaded_file[]", sourceFile[i]); 
      } 

      /*multipart.addFilePart("fileUpload", uploadFile1); 
      multipart.addFilePart("fileUpload", uploadFile2);*/ 

      List<String> response = multipart.finish(); 

      System.out.println("SERVER REPLIED:"); 

      for (String line : response) { 
       System.out.println(line); 
      } 
     } catch (IOException ex) { 
      System.err.println(ex); 
     } 
    } 

uploader.php

foreach ($_FILES["uploaded_file"]["error"] as $key => $error) { 
    if ($error == UPLOAD_ERR_OK) { 
     $tmp_name = $_FILES["uploaded_file"]["tmp_name"][$key]; 
     $name = $_FILES["uploaded_file"]["name"][$key]; 
    $file_path = "../post_uploaded_images/"; 
     $file_path = $file_path . $name; 
      if(@move_uploaded_file($tmp_name, $file_path)) 
      { 
       echo "success"; 

      } else{ 

       echo "fail"; 
      } 
    } 
}