Java的HTTP通信

/*
* 向服务器发送数据,并接受返回的数据
*/
public static String send2Server(String url, List <NameValuePair> params){
String res = null;

// 建立HTTPPost连接
HttpPost httpRequest = new HttpPost(url);
try
{
// 发出HTTP Request
httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
// 取得HTTP Response
HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
res = EntityUtils.toString(httpResponse.getEntity());
}
catch (Exception e){
e.printStackTrace();
}

return res;
}