Apache HttpClient组件封装工具类

package com.mengyao.spider.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.http.NameValuePair;

/**
 * 依赖于Apache httpcomponents项目下的HttpClient组件中的httpclient-4.4.jar、httpcore-4.4.jar、commons-logging-1.2.jar        httpUtil.setHeader(httpGet, headers);
        //提交HttpGet请求，同时获取Http响应
        CloseableHttpResponse response = httpClient.execute(httpGet);
        //获取Http的响应头参数
        Map<String, String> header = httpUtil.getHeader(response);
        //获取Http响应中的原生数据内容，同时关闭Http底层连接
        String rawContent = httpUtil.getRawContent(response.getEntity(), true);
        //释放本次Http请求实例
        httpUtil.clean(httpClient);
        /************************************* 创建HttpGet请求End ***********************************/
        
        //HttpPost请求与上述代码同理，不做演示
    }
}