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<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/hint.css/2.4.1/hint.min.css"><p>今天网络爬虫开始入门，看了《自己动手写网络爬虫》第一章，作者文中提出了使用httpclient-4.1.2.jar,结果在示例中自己用的httpclient-4.3.0以上的版本，在小节最后的总结程序Java网页抓取示例程序中又用了commons-httpclient的jar包，这三者在写法上有很大差别，尤其是commons-httpclient，已经是遗留版本，官方不推荐使用了，于是我就索性学习了下httpclient最新的文档，把Java网页抓取示例程序重写了一遍。 <figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div></pre></td><td class="code"><pre><div class="line"></div><div class="line">public class RetrievePage {</div><div class="line"> private static HttpClient httpClient = HttpClients.createDefault();</div><div class="line"> public static boolean downloadPage(String path) throws ClientProtocolException, IOException {</div><div class="line"> HttpPost httpPost = new HttpPost(path); </div><div class="line">// HttpHost proxy = new HttpHost("172.17.18.84",8080,"http");</div><div class="line">// RequestConfig rq = RequestConfig.custom().setProxy(proxy).build();</div><div class="line">// httpPost.setConfig(rq);</div><div class="line"> InputStream input = null;</div><div class="line"> OutputStream output = null;</div><div class="line">// HttpGet httpGet = new HttpGet(path);</div><div class="line"> List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);</div><div class="line"> nameValuePairs.add(new BasicNameValuePair("name", "lietu"));</div><div class="line"> nameValuePairs.add(new BasicNameValuePair("password", "*****"));</div><div class="line"> httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs,"UTF-8"));</div><div class="line"> HttpResponse response = httpClient.execute(httpPost);</div><div class="line"> int statusCode = response.getStatusLine().getStatusCode();</div><div class="line"> System.out.println(statusCode);</div><div class="line"> if(statusCode == HttpStatus.SC_OK) {</div><div class="line"> String bodyAsString = EntityUtils.toString(response.getEntity(),"utf-8");</div><div class="line"> input = new ByteArrayInputStream(bodyAsString.getBytes());</div><div class="line"> String filename = path.substring(path.lastIndexOf('/')+1);</div><div class="line"> System.out.println(filename);</div><div class="line"> output = new FileOutputStream(filename);</div><div class="line"> int tempByte = -1;</div><div class="line"> while((tempByte = input.read()) > 0) {</div><div class="line"> output.write(tempByte);</div><div class="line"> }</div><div class="line"> if(input != null) {</div><div class="line"> input.close();</div><div class="line"> }</div><div class="line"> if(output != null) {</div><div class="line"> output.close();</div><div class="line"> }</div><div class="line"> return true;</div><div class="line"> }</div><div class="line"> return false;</div><div class="line"> }</div><div class="line"> public static void main(String[] args) {</div><div class="line"> try {</div><div class="line"> RetrievePage.downloadPage("http://www.lietu.com");</div><div class="line"> } catch (IOException e) {</div><div class="line"> e.printStackTrace();</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>注释掉的地方是设置代理，以及Get通信方式，可以根据需要使用。个人感悟：IT方面更新太快，一切都要以官方文档为主要依据。</p>
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