import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
 
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.HttpGet;
import org.apache.http.client.methods.HttpPost;
 
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.pingan.qhcs.map.audit.constant.CodeConstant;
import com.pingan.qhcs.map.audit.exception.MapException;

public class HttpClientUtil {

    protected static Log logger = LogFactory.getLog(HttpClientUtil.class);
    
    private static PoolingHttpClientConnectionManager cm;
    private static String EMPTY_STR = "";
    private static String UTF_8 = "UTF-8";

    private static void init() {
        if (cm == null) {
            cm = new PoolingHttpClientConnectionManager();
            cm.setMaxTotal(50);// 整個連接池最大連接數
            cm.setDefaultMaxPerRoute(5);// 每路由最大連接數，默認值是2
        }
    }

    /**
     * 通過連接池獲取HttpClient
     * 
     * @return
     */
    public static CloseableHttpClient getHttpClient() {
        init();
        return HttpClients.custom().setConnectionManager(cm).build();
    }

    public static String httpGetRequest(String url) {
        HttpGet httpGet = new HttpGet(url);
        return getResult(httpGet);
    }

    public static String httpGetRequest(String url, Map<String, Object> params) throws URISyntaxException {
        URIBuilder ub = new URIBuilder();
        ub.setPath(url);

        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        ub.setParameters(pairs);

        HttpGet httpGet = new HttpGet(ub.build());
        
        return getResult(httpGet);
    }

    public static String httpGetRequest(String url, Map<String, Object> headers, Map<String, Object> params)
            throws URISyntaxException {
        URIBuilder ub = new URIBuilder();
        ub.setPath(url);

        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        ub.setParameters(pairs);

        HttpGet httpGet = new HttpGet(ub.build());
        for (Map.Entry<String, Object> param : headers.entrySet()) {
            httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));
        }
        return getResult(httpGet);
    }

    public static String httpPostRequest(String url) {
        HttpPost httpPost = new HttpPost(url);
        return getResult(httpPost);
    }

    public static String httpPostRequest(String url, Map<String, Object> params) throws UnsupportedEncodingException {
        HttpPost httpPost = new HttpPost(url);
        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
        return getResult(httpPost);
    }

    public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object> params)
            throws UnsupportedEncodingException {
        HttpPost httpPost = new HttpPost(url);

        for (Map.Entry<String, Object> param : headers.entrySet()) {
            httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
        }

        ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
        httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));

        return getResult(httpPost);
    }

    public static String httpPostRequest(String url, Map<String, Object> headers, String strBody)
            throws Exception {
        HttpPost httpPost = new HttpPost(url);

        for (Map.Entry<String, Object> param : headers.entrySet()) {
            httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
        }
        httpPost.setEntity(new StringEntity(strBody, UTF_8));
        return getResult(httpPost);
    }
    
    private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object> params) {
        ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();
        for (Map.Entry<String, Object> param : params.entrySet()) {
            pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));
        }

        return pairs;
    }

    /**
     * 處理Http請求
     * 
     *  setConnectTimeout：設置連接超時時間，單位毫秒。
     *  setConnectionRequestTimeout：設置從connect Manager獲取Connection 超時時間，單位毫秒。這個屬性是新加的屬性，因為目前版本是可以共享連接池的。
     *  setSocketTimeout：請求獲取數據的超時時間，單位毫秒。 如果訪問一個接口，多少時間內無法返回數據，就直接放棄此次調用。
     *  
     * @param request
     * @return
     */
    private static String getResult(HttpRequestBase request) {
        
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(60000)
                .setConnectionRequestTimeout(5000).setSocketTimeout(60000).build();
        request.setConfig(requestConfig);// 設置請求和傳輸超時時間

        // CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpClient httpClient = getHttpClient();
        try {
            CloseableHttpResponse response = httpClient.execute(request); //執行請求
            // response.getStatusLine().getStatusCode();
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                // long len = entity.getContentLength();// -1 表示長度未知
                String result = EntityUtils.toString(entity);
                response.close();
                // httpClient.close();
                return result;
            }
        } catch (ClientProtocolException e) {
            logger.error("[maperror] HttpClientUtil ClientProtocolException : " + e.getMessage());
            throw new MapException(CodeConstant.CODE_CONNECT_FAIL, "HttpClientUtil ClientProtocolException ：" + e.getMessage());
        } catch (IOException e) {
            logger.error("[maperror] HttpClientUtil IOException : " + e.getMessage());
            throw new MapException(CodeConstant.CODE_CONNECT_FAIL, "HttpClientUtil IOException ：" + e.getMessage());
        } finally {

        }
        return EMPTY_STR;
    }

}

HttpUtils 發送http請求工具類