httputil工具类

package com.xgdmsr.common.utils;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
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;

/**
 * http工具类
 */
public class HttpUtil {
    private static final Log logger = LogFactory.getLog（HttpUtil.class）;
    private static String ENCOCE_UTF_8 = “UTF-8“;
    private static CloseableHttpClient client = null;

    private HttpUtil（） {
    }

    private static CloseableHttpClient getClientInstance（） {
        if （client == null） {
            synchronized （HttpUtil.class） {
                if （client == null） {
                    // 设置每个路由的最大并发连接数为20以提高性能，默认为2
                    client = HttpClientBuilder.create（）.setMaxConnPerRoute（20）
                            .build（）;
                }
            }
        }
        return client;
    }


    /**
     * @param url
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String httpGet（String url） throws ClientProtocolException IOException {
        // 创建httpget
        HttpGet httpGet = new HttpGet（url）;
        HttpResponse response = getClientInstance（）.execute（httpGet）;
        HttpEntity entity = response.getEntity（）;
        return EntityUtils.toString（entity）;
    }

    public static HttpEntity httpGetForEntity（String url） throws Exception {
        HttpGet httpGet = new HttpGet（url）;
        HttpResponse response = getClientInstance（）.execute（httpGet）;
        return response.getEntity（）;
    }

    /**
     * post请求
     *
     * @param url
     * @param params
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public static String httpPost（String url Map params） throws