public String post(String actionUrl, Map<String, String> params) throws IOException {

        String BOUNDARY = java.util.UUID.randomUUID().toString();
String PREFIX = "--";
String 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(30 * 1000); // 快取的最長時間
conn.setDoInput(true);// 允許輸入
conn.setDoOutput(true);// 允許輸出
conn.setUseCaches(false); // 不允許使用快取
conn.setRequestMethod("POST");
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("Charsert"
 
, "UTF-8");
conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY);
StringBuilder sb = new StringBuilder();
        if (params!=null) {
            // 首先組拼文字型別的引數
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());
        if (!TextUtils.isEmpty(sb.toString())) {
            outStream.write(sb.toString().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();
        if (res == 200) {
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
StringBuffer buffer = new StringBuffer();
String line = "";
            while ((line = bufferedReader.readLine()) != null){
                buffer.append(line);
}

//          int ch;
//          StringBuilder sb2 = new StringBuilder();
//          while ((ch = in.read()) != -1) {
//              sb2.append((char) ch);
//          }
return buffer.toString();
}
        outStream.close();
conn.disconnect();
        return in.toString();
}