public static String sendPost(String url,String paramStr) {

// 作为StringBuffer初始化的字符串

String encode = “utf-8”;

StringBuffer buffer = new StringBuffer();

try {

if(null != paramStr && !"".equals(paramStr.trim())){

buffer.append(paramStr);

}

HttpURLConnection urlConnection = (HttpURLConnection) new URL(url).openConnection();

urlConnection.setConnectTimeout(3000);

urlConnection.setRequestMethod(“POST”);

urlConnection.setDoInput(true);// 表示从服务器获取数据

urlConnection.setDoOutput(true);// 表示向服务器写数据

// 获得上传信息的字节大小以及长度

byte[] mydata = buffer.toString().getBytes(“utf-8”);//请求参数设置utf-8编码，防止变成客服消息

// 表示设置请求体的类型是文本类型

urlConnection.setRequestProperty(“Content-Type”,

“application/x-www-form-urlencoded;charset=utf-8”);

urlConnection.setRequestProperty(“Content-Length”,

String.valueOf(mydata.length));

// 获得输出流,向服务器输出数据

OutputStream outputStream = urlConnection.getOutputStream();

outputStream.write(mydata, 0, mydata.length);

outputStream.close();

// 获得服务器响应的结果和状态码

int responseCode = urlConnection.getResponseCode();

if (responseCode == 200) {

return changeInputStream(urlConnection.getInputStream(), encode);

}

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return “”;

}