<dependency>

      <groupId>org.apache.httpcomponents</groupId>

      <artifactId>httpasyncclient</artifactId>

      <version>4.0-alpha3</version>

      <scope>compile</scope>

    </dependency>

 package com.cph.utils;

 import java.io.IOException;

 import org.apache.http.HttpEntity;

 import org.apache.http.HttpResponse;

 import org.apache.http.HttpStatus;

 import org.apache.http.client.ClientProtocolException;

 import org.apache.http.client.methods.HttpGet;

 import org.apache.http.client.methods.HttpUriRequest;

 import org.apache.http.impl.client.DefaultHttpClient;

 import org.apache.http.util.EntityUtils;

 /**

  * httpclient 帮助类<br>

  * 4.1.2测试版

  *

  * @author cphmvp

  *

  */

 public class HttpClientUtil {

     private static String encoding = "UTF-8";

     /**

      * get方式下载

      *

      * @param url

      */

     public static String downloadGet(String url) {

         String htmls = null;

         DefaultHttpClient client = new DefaultHttpClient();

         // 新建get请求

         HttpUriRequest request = new HttpGet(url);

         // 封装请求头

         pageRequest(request);

         // 声明响应

         HttpResponse response = null;

         // 响应实体

         HttpEntity entity = null;

         try {

             response = client.execute(request);

             System.out.println("响应码： "

                     + response.getStatusLine().getStatusCode());

             if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {

                 entity = response.getEntity();

                 byte[] content = EntityUtils.toByteArray(entity);

                 htmls = new String(content, encoding);

             }

         } catch (ClientProtocolException e) {

             e.printStackTrace();

         } catch (IOException e) {

             e.printStackTrace();

         } finally {

             // 关闭客户端

             client.getConnectionManager().shutdown();

         }

         return htmls;

     }

     /**

      * 封装请求头

      *

      * @param request

      */

     private static void pageRequest(HttpUriRequest request) {

         // 设置浏览器版本

         request.setHeader(

                 "User-Agent",

                 "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; MyIE 2.0 Beta 2; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3)");

         // 设置cookie refer等

         request.setHeader(

                 "Cookie",

                 "RK=hki7lw6qHP; wbilang_821910184=zh_CN; wbilang_10000=zh_CN; dm_login_weixin_rem=; dm_login_weixin_scan=; wb_regf=%3B0%3B%3Bwww.baidu.com%3B0; mb_reg_from=8; ts_last=t.qq.com/; ts_refer=search.t.qq.com/index.php; ts_uid=7492426386; wbilang_384871492=zh_CN; ts_last=1.t.qq.com/wolongxian; ts_refer=www.baidu.com/s; ts_uid=7492426386; pgv_pvid=1942759996; pgv_info=ssid=s5111200112; o_cookie=384871492; ptui_loginuin=821910184; ptisp=cnc; ptcz=9c03596fa66d550bcd5c8cd812f16ad5d6c2074604285851a218c478774eb6bb; luin=o0821910184; lskey=00010000b43bed256a14b910da63ac03a1c1a042994fea6a8a7078dcb2ea566d5dc09188883ddddd1f7feadb; pt2gguin=o0821910184; uin=o0821910184; skey=@xObtCqUUW; p_uin=o0821910184; p_skey=swqZymgXczQrTdTin9Qe44jMT5cTNoTeSzaXrxDjs3k_; pt4_token=OlMTg1UJSdPz-VzgfdEgFQ__; p_luin=o0821910184; p_lskey=000400001663db9b9783c84586b6d929044d17e291916d1cfcfb93c0f520f05e8c85adc89dffc94e52b1325e");

     }

     public static void main(String[] args) {

         String url = "http://www.baidu.com/";

         System.out.println(downloadGet(url));

     }

 }