HttpServiceUtils

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
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.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HttpServiceUtils {

    private static final Logger log = LoggerFactory.getLogger(HttpServiceUtils.class);

    private static volatile CloseableHttpClient httpClient;

    private static final String DEFAULT_ENCODING = "UTF-8";

    public static CloseableHttpClient getHttpClient() {
        if (httpClient == null) {
            synchronized (HttpServiceUtils.class) {
                if (httpClient == null) {
                    httpClient = HttpClientBuilder.create().build();
                }
            }
        }

        return httpClient;
    }

    /**
     * post请求
     *
     * @param url
     * @param content
     * @return
     */
    public static String postRequest(String url, String content) {
        return postRequest(url, content, DEFAULT_ENCODING, DEFAULT_ENCODING);
    }

    /**
     * post请求
     *
     * @param url
     * @param content
     * @param requestEncode
     * @param responseEncode
     * @return
     */
    public static String postRequest(String url, String content, String requestEncode, String responseEncode) {
        log.debug("Post request [" + url + "] with content [" + content + "]");

        String result = null;
        CloseableHttpResponse response = null;
        try {
            HttpPost post = new HttpPost(url);
            RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(30000).setConnectTimeout(30000)
                    .setConnectionRequestTimeout(30000).build();
            post.setConfig(requestConfig);
            post.setEntity(new StringEntity(content, ContentType.create("text/xml", requestEncode)));

            CloseableHttpClient client = getHttpClient();
            response = client.execute(post);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == HttpStatus.SC_OK) {
                HttpEntity entity = response.getEntity();
                result = EntityUtils.toString(entity, responseEncode);

                EntityUtils.consume(entity);

                log.debug("request successful with content [" + content + "], response [" + result + "]");
            } else {
                log.debug("request failed with content [" + content + "], status code [" + statusCode + "]");
            }
        } catch (Exception e) {
            log.debug("post request failed with content [" + content + "]!", e);
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                // ignore
            }
        }

        return result;
    }

    /**
     * post请求
     *
     * @param paramMap
     * @param url
     * @return
     */
    public static String postRequest(String url, Map paramMap) {
        return postRequest(url, paramMap, "UTF-8", "UTF-8");
    }

    /**
     * post请求
     *
     * @param url
     * @param paramMap
     * @param requestEncode
     * @param responseEncode
     * @return
     */
    public static String postRequest(String url, Map paramMap, String requestEncode,
            String responseEncode) {
        log.debug("Post request [" + url + "] with paramMap [" + paramMap + "]");

        List pairList = new ArrayList();
        for (Entry entry : paramMap.entrySet()) {
            pairList.add(new BasicNameValuePair(entry.getKey(), String.valueOf(entry.getValue())));
        }

        String result = null;
        CloseableHttpResponse response = null;
        try {
            HttpPost post = new HttpPost(url);
            RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(10000).setConnectTimeout(10000)
                    .build();
            post.setConfig(requestConfig);
            post.setEntity(new UrlEncodedFormEntity(pairList, requestEncode));

            CloseableHttpClient client = getHttpClient();
            response = client.execute(post);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == HttpStatus.SC_OK) {
                HttpEntity entity = response.getEntity();
                result = EntityUtils.toString(entity, responseEncode);

                EntityUtils.consume(entity);

                log.debug("request successful with paramMap [" + paramMap + "], response [" + result + "]");
            } else {
                log.debug("request failed with paramMap [" + paramMap + "], status code [" + statusCode + "]");
            }
        } catch (Exception e) {
            log.debug("post request failed with paramMap [" + paramMap + "]!", e);
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                // ignore
            }
        }

        return result;
    }

    public static void main(String[] args) {

    }
}