httpclient4.5调用接口

import net.sf.json.JSONObject;

import org.apache.commons.collections4.map.HashedMap;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class HttpUtil
{
/**
     * 获取接口返回值
     * @param url
     * @return
     * @see [类、类#方法、类#成员]
     */
    public static JSONObject getApiData(String url, List<BasicNameValuePair> paramList)
    {
        //这里开始用于httpclient3.1升级到4.5修改，如果有问题 将下面原来的实现方式还原
        JSONObject result = new JSONObject();
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        HttpEntity entity = null;
        String responseContent = null;
        int code = -1;
        
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(10 * 1000).build();
        //创建请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");//设置请求头
        try
        {
            httpPost.setEntity(new UrlEncodedFormEntity(paramList, "utf-8"));//设置请求参数
            httpPost.setConfig(requestConfig);//设置超时时间
            httpPost.releaseConnection();//这里应该是让连接可以重用
            // 创建默认的httpClient实例.  
            httpClient = HttpClients.createDefault();
            // 发送请求开始时间
            long starttime = System.currentTimeMillis();
            // 执行请求  
            response = httpClient.execute(httpPost);
            // 发送请求结束时间
            long endtime = System.currentTimeMillis();
            entity = response.getEntity();
            // 获取请求返回的状态码
            code = response.getStatusLine().getStatusCode();
            responseContent = EntityUtils.toString(entity, "UTF-8");
            result = JSONObject.fromObject(responseContent);
        }
        catch (UnsupportedEncodingException e)
        {
            LOG.error("Order find UnsupportedEncodingException error...");
        }
        catch (ClientProtocolException e)
        {
            LOG.error("Order find ClientProtocolException error...");
        }
        catch (IOException e)
        {
            LOG.error("Order find IOException error...");
        }
        finally
        {
            try
            {
                if (response != null)
                {
                    response.close();
                }
            }
            catch (IOException e)
            {
                LOG.error("response close error " + e.getMessage());
            }
            try
            {
                if (null != httpClient)
                {
                    httpClient.close();
                }
            }
            catch (IOException e)
            {
                LOG.error("httpClient close error " + e.getMessage());
            }
        }
        return result;
    }
}