android通过http上传图片

android 通过http post上传文件
1.接口类型为http post，参数为file
public static String post(String actionUrl, File file) throws IOException {    String result = null;    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(actionUrl);    HttpURLConnection conn = (HttpURLConnection) uri.openConnection();    conn.setReadTimeout(5 * 1000); // 缓存的最长时间    conn.setDoInput(true);// 允许输入    conn.setDoOutput(true);// 允许输出    conn.setUseCaches(false); // 不允许使用缓存    conn.setRequestMethod("POST");    conn.setRequestProperty("connection", "keep-alive");    conn.setRequestProperty("Charsert", "UTF-8");    conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);    DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());    // 发送文件数据    if (file != null)    {      StringBuilder sb1 = new StringBuilder();      sb1.append(PREFIX);      sb1.append(BOUNDARY);      sb1.append(LINEND);      sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + FileUtil.getSDPath() + "/pic.jpg" + "\"" + LINEND);      sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND);      sb1.append(LINEND);      outStream.write(sb1.toString().getBytes());      InputStream is = new FileInputStream(file);      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());    }       // 请求结束标志    byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();    outStream.write(end_data);    outStream.flush();    // 得到响应码    int res = conn.getResponseCode();    System.out.println("response----->>" + conn.getResponseMessage());    InputStream in = conn.getInputStream();    if (res == 200) {      result = convertStreamToString(in);    }    outStream.close();    conn.disconnect();    return result;  }
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