Android使用post方式上傳圖片到伺服器的方法_Android

本文執行個體講述了Android使用post方式上傳圖片到伺服器的方法。分享給大家供大家參考，具體如下：

/** * 上傳檔案到伺服器類 *  * @author tom */public class UploadUtil {  private static final String TAG = "uploadFile";  private static final int TIME_OUT = 10 * 1000; // 逾時時間  private static final String CHARSET = "utf-8"; // 設定編碼  /**   * Android上傳檔案到服務端   *    * @param file 需要上傳的檔案   * @param RequestURL 請求的rul   * @return 返迴響應的內容   */  public static String uploadFile(File file, String RequestURL) {    String result = null;    String BOUNDARY = UUID.randomUUID().toString(); // 邊界標識 隨機產生    String PREFIX = "--", LINE_END = "\r\n";    String CONTENT_TYPE = "multipart/form-data"; // 內容類型    try {      URL url = new URL(RequestURL);      HttpURLConnection conn = (HttpURLConnection) url.openConnection();      conn.setReadTimeout(TIME_OUT);      conn.setConnectTimeout(TIME_OUT);      conn.setDoInput(true); // 允許輸入資料流      conn.setDoOutput(true); // 允許輸出資料流      conn.setUseCaches(false); // 不允許使用緩衝      conn.setRequestMethod("POST"); // 請求方式      conn.setRequestProperty("Charset", CHARSET); // 設定編碼      conn.setRequestProperty("connection", "keep-alive");      conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);      if (file != null) {        /**         * 當檔案不為空白，把檔案封裝並且上傳         */        DataOutputStream dos = new DataOutputStream(conn.getOutputStream());        StringBuffer sb = new StringBuffer();        sb.append(PREFIX);        sb.append(BOUNDARY);        sb.append(LINE_END);        /**         * 這裡重點注意： name裡面的值為服務端需要key 只有這個key 才可以得到對應的檔案         * filename是檔案的名字，包含尾碼名的 比如:abc.png         */        sb.append("Content-Disposition: form-data; name=\"uploadfile\"; filename=\""            + file.getName() + "\"" + LINE_END);        sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END);        sb.append(LINE_END);        dos.write(sb.toString().getBytes());        InputStream is = new FileInputStream(file);        byte[] bytes = new byte[1024];        int len = 0;        while ((len = is.read(bytes)) != -1) {          dos.write(bytes, 0, len);        }        is.close();        dos.write(LINE_END.getBytes());        byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();        dos.write(end_data);        dos.flush();        /**         * 擷取響應碼 200=成功 當響應成功，擷取響應的流         */        int res = conn.getResponseCode();        Log.e(TAG, "response code:" + res);        // if(res==200)        // {        Log.e(TAG, "request success");        InputStream input = conn.getInputStream();        StringBuffer sb1 = new StringBuffer();        int ss;        while ((ss = input.read()) != -1) {          sb1.append((char) ss);        }        result = sb1.toString();        Log.e(TAG, "result : " + result);        // }        // else{        // Log.e(TAG, "request error");        // }      }    } catch (MalformedURLException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }    return result;  }  /**   * 通過拼接的方式構造請求內容，實現參數傳輸以及檔案傳輸   *    * @param url Service net address   * @param params text content   * @param files pictures   * @return String result of Service response   * @throws IOException   */  public static String post(String url, Map<String, String> params, Map<String, File> files)      throws IOException {    String BOUNDARY = java.util.UUID.randomUUID().toString();    String PREFIX = "--", LINEND = "\r\n";    String MULTIPART_FROM_DATA = "multipart/form-data";    String CHARSET = "UTF-8";    URL uri = new URL(url);    HttpURLConnection conn = (HttpURLConnection) uri.openConnection();    conn.setReadTimeout(10 * 1000); // 緩衝的最長時間    conn.setDoInput(true);// 允許輸入    conn.setDoOutput(true);// 允許輸出    conn.setUseCaches(false); // 不允許使用緩衝    conn.setRequestMethod("POST");    conn.setRequestProperty("connection", "keep-alive");    conn.setRequestProperty("Charsert", "UTF-8");    conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);    // 首先組拼文本類型的參數    StringBuilder sb = new StringBuilder();    for (Map.Entry<String, String> entry : params.entrySet()) {      sb.append(PREFIX);      sb.append(BOUNDARY);      sb.append(LINEND);      sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);      sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND);      sb.append("Content-Transfer-Encoding: 8bit" + LINEND);      sb.append(LINEND);      sb.append(entry.getValue());      sb.append(LINEND);    }    DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());    outStream.write(sb.toString().getBytes());    // 傳送檔案資料    if (files != null)      for (Map.Entry<String, File> file : files.entrySet()) {        StringBuilder sb1 = new StringBuilder();        sb1.append(PREFIX);        sb1.append(BOUNDARY);        sb1.append(LINEND);        sb1.append("Content-Disposition: form-data; name=\"uploadfile\"; filename=\""            + file.getValue().getName() + "\"" + LINEND);        sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);        sb1.append(LINEND);        outStream.write(sb1.toString().getBytes());        InputStream is = new FileInputStream(file.getValue());        byte[] buffer = new byte[1024];        int len = 0;        while ((len = is.read(buffer)) != -1) {          outStream.write(buffer, 0, len);        }        is.close();        outStream.write(LINEND.getBytes());      }    // 請求結束標誌    byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();    outStream.write(end_data);    outStream.flush();    // 得到響應碼    int res = conn.getResponseCode();    InputStream in = conn.getInputStream();    StringBuilder sb2 = new StringBuilder();    if (res == 200) {      int ch;      while ((ch = in.read()) != -1) {        sb2.append((char) ch);      }    }    outStream.close();    conn.disconnect();    return sb2.toString();  }}

樣本調用第二種方式上傳：

final Map<String, String> params = new HashMap<String, String>();params.put("send_userId", String.valueOf(id));params.put("send_email", address);params.put("send_name", name);params.put("receive_email", emails);final Map<String, File> files = new HashMap<String, File>();files.put("uploadfile", file);final String request = UploadUtil.post(requestURL, params, files);

更多關於Android相關內容感興趣的讀者可查看本站專題：《Android調試技巧與常見問題解決方案匯總》、《Android開發入門與進階教程》、《Android多媒體操作技巧匯總(音頻,視頻,錄音等)》、《Android基本組件用法總結》、《Android視圖View技巧總結》、《Android布局layout技巧總結》及《Android控制項用法總結》

希望本文所述對大家Android程式設計有所協助。