HttpClient的get方法获取网页内容

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我是靠谱客的博主细心电灯胆，最近开发中收集的这篇文章主要介绍HttpClient的get方法获取网页内容，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

－HTTP请求
请求的URI是统一资源定位符，它标识了应用于哪个请求之上的资源；
HTTP请求URI包含一个协议模式，主机名称，可选的端口，资源路径，可选的查询和可选的片段。

例子：

http://www.google.com/search?hl=en&q=httpclient&btnG=Google+Search&aq=f&oq=

1.1.2 HTTP响应
是什么？
HTTP响应是由服务器在接收和解释请求报文之后返回发送给客户端的报文；
包含了什么？
响应报文的第一行包含了协议版本，之后是数字状态码和相关联的文本段。

1.1.3 处理报文头部

1.1.4 HTTP实体
是什么？
实体可以在一些请求和响应中找到，因为它们也是可选的
1.1.4.2 使用HTTP实体
因为一个实体既可以代表二进制内容又可以代表字符内容，它也支持字符编码（支持后者也就是字符内容）。

实体是当使用封闭内容执行请求，或当请求已经成功执行，或当响应体结果发功到客户端时创建的。

要从实体中读取内容，可以通过HttpEntity#getContent()方法从输入流中获取，这会返回一个java.io.InputStream对象，或者提供一个输出流到HttpEntity#writeTo(OutputStream)方法中，这会一次返回所有写入到给定流中的内容。

－－－－－－－－－－－－－－－－－－－－
这才是重要的：
来源：http://blog.csdn.net/eleven521/article/details/41284073

public static void main(String[] args) throws Exception {
        HttpClientTest test = new HttpClientTest();
        test.sentGet("/");
    }

    public void sentGet(String url) throws Exception
    {
        //创建CloseableHttpClient实现类对象
        CloseableHttpClient httpclient = HttpClients.createDefault();
        //内容
        String result = "";
        try {

            HttpHost targetHost = new HttpHost("www.baidu.cn");
            // 创建get连接
            HttpGet httpget = new HttpGet(url);
            // 设置超时时间
            RequestConfig requestConfig = RequestConfig.custom()
                    .setSocketTimeout(2000).setConnectTimeout(1000 * 10)
                    .build();// 设置请求和传输超时时间

            httpget.setConfig(requestConfig);
            httpget.setHeader("Accept-Charset","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.2");

            // 发送请求
            CloseableHttpResponse response = httpclient.execute(targetHost,httpget);

            System.out.println("URI：" + httpget.getURI());

            // 获取状态码
            System.out.println("状态码："+ response.getStatusLine().getStatusCode());
            //获取头部信息
            System.out.println("头部信息："+ httpget.getFirstHeader("Accept-Charset").getValue());

            // BufferedReader reader= new BufferedReader(new InputStreamReader(response.get));

            // 获取所有的请求头信息
            System.out.println("－－－－－－－所有的请求头信息－－－－－－－－");
            Header headers[] = response.getAllHeaders();
            int ii = 0;
            while (ii < headers.length) 
            {
                System.out.println(headers[ii].getName() + ":"+ headers[ii].getValue());
                ++ii;
            }

            // 抓取网页内容
            HttpEntity entity = response.getEntity();
            BufferedReader br = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
            String line;
            while ((line = br.readLine()) != null) {
                result += line;
            }

            br.close();
            System.out.println("result:" + result);

            // 终止请求
            httpget.abort();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 终止请求
            httpclient.close();
        }


}

输出为：

URI：/
状态码：200
头部信息：Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1.2
－－－－－－－所有的请求头信息－－－－－－－－
Date:Tue, 14 Apr 2015 15:37:39 GMT
Content-Type:text/html; charset=utf-8
Transfer-Encoding:chunked
Connection:Keep-Alive
Vary:Accept-Encoding
Set-Cookie:BAIDUID=60CD86D52AEBCC48C313DA6965654B49:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie:BIDUPSID=60CD86D52AEBCC48C313DA6965654B49; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
Set-Cookie:BDSVRTM=0; path=/
Set-Cookie:BD_HOME=0; path=/
Set-Cookie:H_PS_PSSID=12609_5445_13422_1455_12658_13075_12825_13382_12867_13320_12691_13410_8502_12723_12736_13439_13086_13325_13210_12836_13490_13162_8498_10633; path=/; domain=.baidu.com
P3P:CP=" OTI DSP COR IVA OUR IND COM "
Cache-Control:private
Cxy_all:baidu+08e14ea2115e8537335dd25a05cd92ff
Expires:Tue, 14 Apr 2015 15:37:33 GMT
X-Powered-By:HPHP
Server:BWS/1.1
BDPAGETYPE:1
BDQID:0xbfe9b9490000c93d
BDUSERID:0
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