用post方式上传图片到服务器

/**
 * 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);
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