Android使用post方式上传图片到服务器的方法

本文实例讲述了Android使用post方式上传图片到服务器的方法。分享给大家供大家参考，具体如下：

/** * 上传文件到服务器类 *  * @author tom */public class UploadUtil {  private static final String TAG = "uploadFile";  private static final int TIME_OUT = 10 * 1000; // 超时时间  private static final String CHARSET = "utf-8"; // 设置编码  /**   * Android上传文件到服务端   *    * @param file 需要上传的文件   * @param RequestURL 请求的rul   * @return 返回响应的内容   */  public static String uploadFile(File file, String RequestURL) {    String result = null;    String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成    String PREFIX = "--", LINE_END = "\r\n";    String CONTENT_TYPE = "multipart/form-data"; // 内容类型    try {      URL url = new URL(RequestURL);      HttpURLConnection conn = (HttpURLConnection) url.openConnection();      conn.setReadTimeout(TIME_OUT);      conn.setConnectTimeout(TIME_OUT);      conn.setDoInput(true); // 允许输入流      conn.setDoOutput(true); // 允许输出流      conn.setUseCaches(false); // 不允许使用缓存      conn.setRequestMethod("POST"); // 请求方式      conn.setRequestProperty("Charset", CHARSET); // 设置编码      conn.setRequestProperty("connection", "keep-alive");      conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);      if (file != null) {        /**         * 当文件不为空，把文件包装并且上传         */        DataOutputStream dos = new DataOutputStream(conn.getOutputStream());        StringBuffer sb = new StringBuffer();        sb.append(PREFIX);        sb.append(BOUNDARY);        sb.append(LINE_END);        /**         * 这里重点注意： name里面的值为服务端需要key 只有这个key 才可以得到对应的文件         * filename是文件的名字，包含后缀名的 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();        /**         * 获取响应码 200=成功 当响应成功，获取响应的流         */        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;  }  /**   * 通过拼接的方式构造请求内容，实现参数传输以及文件传输   *    * @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 params, Map 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); // 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);    // 首先组拼文本类型的参数    StringBuilder sb = new StringBuilder();    for (Map.Entry 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());    // 发送文件数据    if (files != null)      for (Map.Entry 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());      }    // 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();    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();  }}

示例调用第二种方式上传：

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

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android调试技巧与常见问题解决方法汇总》、《Android开发入门与进阶教程》、《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。

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