Http post request

package com.java.util;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.fluent.Request;
import org.apache.http.message.BasicNameValuePair;

/**
* http请求工具类
* @author
* 需要引用fluent-hc-4.5.3.jar,httpclient-4.5.3.jar,httpcore-4.4.6.jar
*/
public class HttpRequestUtil {

private static final int connectTimeout = 10000;

private static final int socketTimeout = 60000;
   
    /**
     * http post请求
     * @param url
     * @param paramMap
     * @return
     */
public static String xaHttpPost(String url, Map<String, Object> paramMap) {
String result = null;
long start = System.currentTimeMillis();
try {
UrlEncodedFormEntity formEntity = buildUrlEncodedFormEntity(paramMap);
result = Request.Post(url).useExpectContinue().connectTimeout(connectTimeout).socketTimeout(socketTimeout).body(formEntity).execute().returnContent().asString(Charset.forName("utf-8"));
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
long end = System.currentTimeMillis();
if((end-start)>30000){
System.err.println(url+" take "+(end-start)/1000+" 秒");
}
return result;
}

private static UrlEncodedFormEntity buildUrlEncodedFormEntity(Map<String, Object> paramMap) {
if (paramMap != null) {
List<NameValuePair> parameters = new ArrayList<NameValuePair>();
for (String s : paramMap.keySet()) {
if (paramMap.get(s).getClass().isArray()) {
Object[] arr = (Object[]) paramMap.get(s);
for (Object o : arr) {
parameters.add(new BasicNameValuePair(s, o.toString()));
}
} else {
parameters.add(new BasicNameValuePair(s, paramMap.get(s).toString()));
}
}
// build a form Form entity
return new UrlEncodedFormEntity(parameters, Charset.forName("UTF-8"));
}
return null;
}

   //Test code:
   //http://IP address:89/gpsonline/GPSAPI?version=1&method =vLoginSystem&name=YueE055G3&pwd=000000
  Map<String, Object> paramMap = new HashMap<String,Object>();
   paramMap.put("version", "1");
   paramMap.put("method", "vLoginSystem") ;
   paramMap.put("name", "Guangdong E055G3");
   paramMap.put("pwd", "000000");
  String result=HttpRequestUtil.xaHttpPost(HTTP_URL, paramMap);
//返回格式 
{
　"version":1,
　"success":true,
　"vid":4103747,
　"vKey":"2e8b868d779f1e1c0696e04113e79003"
}

}