Httpclient 和jsoup結和提取網頁內容(某客學院視頻連接）

時間 2019-11-08

標籤 httpclient jsoup 提取網頁內容學院視頻連接欄目系統網絡简体版

原文原文鏈接

最近在極客學院得到體驗會員3個月，而後就去上面看了看，感受課程講的還不錯。整好最近學習Android，而後去上面找點視頻看看。發現只有使用RMB買的會員才能在上面下載視頻。抱着試一試的態度，去看他的網頁源碼，不巧發現有視頻地址連接。而後想起來jsoup提取網頁元素挺方便的，沒事幹就寫了一個demo。html

jsoup 是一款Java 的HTML解析器，可直接解析某個URL地址、HTML文本內容。它提供了一套很是省力的API，可經過DOM，CSS以及相似於jQuery的操做方法來取出和操做數據。

jsoup的主要功能以下：

1. 從一個URL，文件或字符串中解析HTML；

2. 使用DOM或CSS選擇器來查找、取出數據；

3. 可操做HTML元素、屬性、文本；

jsoup的用法中文文檔地址： http://www.open-open.com/jsoup/

使用jsoup提取網頁中指定的內容須要提早作好網頁分析工做。我找到在極客學院一個課程的頁面源碼，很快找到了視頻連接部分;以下圖：<scource/> 標籤中就是視頻連接，經過這個連接咱們能夠經過迅雷下載。

  <source src="http://cv3.jikexueyuan.com/201508081934/f8f3f9f8088f1ba0a6c75594448d96ab/course/1501-1600/1557/video/4278_b_h264_sd_960_540.mp4" type="video/mp4"></source>

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咱們獲取整個html源碼，而後根據<scource/>對源碼進行提取，很容易獲取下載連接。java

接着經過分析網頁，咱們能夠獲得一門課程全部視頻信息。網頁源碼以下：node

 1 <dl class="lessonvideo-list"> 
 2    <dd class="playing"> 
 3     <h2> <span class="sm-icon "></span> <a href="http://www.jikexueyuan.com/course/1748_1.html?ss=1" jktag="&amp;posGP=103001&amp;posArea=0002&amp;posOper=8005&amp;posColumn=1.1">1.編寫本身的自定義 View（上）</a> <span class="lesson-time">00:10:24</span> </h2> 
 4     <blockquote>
 5      本課時主要講解最簡單的自定義 View，而後加入繪製元素（文字、圖形等），而且能夠像使用系統控件同樣在佈局中使用。
 6     </blockquote> 
 7    </dd> 
 8    <dd> 
 9     <h2> <span class="sm-icon "></span> <a href="http://www.jikexueyuan.com/course/1748_2.html?ss=1" jktag="&amp;posGP=103001&amp;posArea=0002&amp;posOper=8005&amp;posColumn=2.2">2.編寫本身的自定義 View（下）</a> <span class="lesson-time">00:12:05</span> </h2> 
10     <blockquote>
11      本課時主要講解最簡單的自定義 View，而後加入繪製元素（文字、圖形等），而且能夠像使用系統控件同樣在佈局中使用。
12     </blockquote> 
13    </dd> 
14    <dd> 
15     <h2> <span class="sm-icon "></span> <a href="http://www.jikexueyuan.com/course/1748_3.html?ss=1" jktag="&amp;posGP=103001&amp;posArea=0002&amp;posOper=8005&amp;posColumn=3.3">3.加入邏輯線程</a> <span class="lesson-time">00:20:34</span> </h2> 
16     <blockquote>
17      本課時須要讓繪製的元素動起來，可是又不阻塞主線程，因此引入邏輯線程。在子線程更新 UI 是不被容許的，可是 View 提供了方法。讓咱們來看看吧。
18     </blockquote> 
19    </dd> 
20    <dd> 
21     <h2> <span class="sm-icon "></span> <a href="http://www.jikexueyuan.com/course/1748_4.html?ss=1" jktag="&amp;posGP=103001&amp;posArea=0002&amp;posOper=8005&amp;posColumn=4.4">4.提取和封裝自定義 View</a> <span class="lesson-time">00:15:41</span> </h2> 
22     <blockquote>
23      本課時主要講解在上個課程的基礎上，進行提取代碼來構造自定義 View 的基類，主要目的是：建立新的自定義 View 時，只需繼承此類並只關心繪製和邏輯，其餘工做由父類完成。這樣既減小重複編碼，也簡化了邏輯。
24     </blockquote> 
25    </dd> 
26    <dd> 
27     <h2> <span class="sm-icon "></span> <a href="http://www.jikexueyuan.com/course/1748_5.html?ss=1" jktag="&amp;posGP=103001&amp;posArea=0002&amp;posOper=8005&amp;posColumn=5.5">5.在 xml 中定義樣式來影響顯示效果</a> <span class="lesson-time">00:14:05</span> </h2> 
28     <blockquote>
29      本課時主要講解的是在 xml 中定義樣式及其屬性，怎麼來影響自定義 View 中的顯示效果的過程和步驟。
30     </blockquote> 
31    </dd> 
32   </dl>

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經過 Elements results1 = doc.getElementsByClass("lessonvideo-list"); 咱們能夠得到視頻列表。而後咱們接着對從視頻列表獲取課程每節課視頻地址使用jsoup遍歷獲取視頻連接。apache

以上是主要思路，另外使用jsoup get方法獲取網頁Docment是是沒有cooike狀態的，有些視頻須要VIP會員登陸才能獲取到視頻播放地址。所以咱們須要用httpclient來模擬用戶登陸狀態。cookie

一下是整個工程源碼。網絡

1 、課程course類，用於存儲課程每一節課的課程名和課程url地址。

 1 public class Course {
 2 
 3     /**
 4      * 連接的地址
 5      */
 6     private String linkHref;
 7     /**
 8      * 連接的標題
 9      */
10     private String linkText;
11 
12     public String getLinkHref() {
13         return linkHref;
14     }
15 
16     public void setLinkHref(String linkHref) {
17         this.linkHref = linkHref;
18     }
19 
20     public String getLinkText() {
21         return linkText;
22     }
23 
24     public void setLinkText(String linkText) {
25         this.linkText = linkText;
26     }
27 
28     @Override
29     public String toString() {
30         return "Video [linkHref=" + linkHref + ", linkText=" + linkText + "]";
31     }
32 
33 }

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二、HttpUtils類，用於模擬用戶登陸狀態。

  1 import java.io.IOException;
  2 import java.io.InputStream;
  3 import java.io.UnsupportedEncodingException;
  4 
  5 import org.apache.http.Header;
  6 import org.apache.http.HttpEntity;
  7 import org.apache.http.HttpHeaders;
  8 import org.apache.http.HttpResponse;
  9 import org.apache.http.HttpStatus;
 10 import org.apache.http.client.ClientProtocolException;
 11 import org.apache.http.client.HttpClient;
 12 import org.apache.http.client.methods.CloseableHttpResponse;
 13 import org.apache.http.client.methods.HttpGet;
 14 import org.apache.http.client.methods.HttpPost;
 15 import org.apache.http.entity.StringEntity;
 16 import org.apache.http.impl.client.CloseableHttpClient;
 17 import org.apache.http.impl.client.DefaultHttpClient;
 18 import org.apache.http.impl.client.HttpClients;
 19 import org.apache.http.util.EntityUtils;
 20 
 21 @SuppressWarnings("deprecation")
 22 public class HttpUtils {
 23     String cookieStr = "";
 24 
 25     public String getCookieStr() {
 26         return cookieStr;
 27     }
 28 
 29     CloseableHttpResponse response = null;
 30 
 31     public CloseableHttpResponse getResponse() {
 32         return response;
 33     }
 34 
 35     public HttpUtils(String cookieStr) {
 36         this.cookieStr = cookieStr;
 37     }
 38 
 39     public HttpUtils() {
 40 
 41     }
 42 
 43     public String Get(String url) {
 44         CloseableHttpClient httpclient = HttpClients.createDefault();
 45         HttpGet httpget = new HttpGet(url);
 46         httpget.setHeader("cookie", cookieStr);
 47         httpget.setHeader(
 48                 HttpHeaders.USER_AGENT,
 49                 "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36");
 50 
 51         try {
 52             response = httpclient.execute(httpget);
 53             HttpEntity entity = response.getEntity();
 54             String res = EntityUtils.toString(entity, "UTF-8");
 55 
 56             return res;
 57         } catch (Exception e) {
 58             System.err.println(String.format("HTTP GET error %s",
 59                     e.getMessage()));
 60         } finally {
 61             try {
 62                 httpclient.close();
 63             } catch (IOException e) {
 64                 // e.printStackTrace();
 65             }
 66         }
 67         return null;
 68     }
 69 
 70     public String Post(String url) {
 71         CloseableHttpClient httpclient = HttpClients.createDefault();
 72         HttpPost httppost = new HttpPost(url.split("\\?")[0]);
 73         StringEntity reqEntity = null;
 74         try {
 75             reqEntity = new StringEntity(url.split("\\?")[1], "UTF-8");
 76         } catch (UnsupportedEncodingException e1) {
 77             // TODO Auto-generated catch block
 78             e1.printStackTrace();
 79         }
 80         httppost.setHeader("cookie", cookieStr);
 81         reqEntity
 82                 .setContentType("application/x-www-form-urlencoded;charset=UTF-8");
 83         httppost.setEntity(reqEntity);
 84         httppost.setHeader(
 85                 HttpHeaders.USER_AGENT,
 86                 "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36");
 87         try {
 88             response = httpclient.execute(httppost);
 89             Header[] headers = response.getAllHeaders();
 90             for (Header h : headers) {
 91                 String name = h.getName();
 92                 String value = h.getValue();
 93                 if ("Set-Cookie".equalsIgnoreCase(name)) {
 94                     cookieStr += subCookie(value);
 95                     //System.out.println(cookieStr);
 96                     // break;
 97                 }
 98             }
 99             HttpEntity entity = response.getEntity();
100 
101             return EntityUtils.toString(entity, "UTF-8");
102         } catch (Exception e) {
103             System.err.println(String.format("HTTP POST error %s",
104                     e.getMessage()));
105         } finally {
106             try {
107                 httpclient.close();
108             } catch (IOException e) {
109                 // e.printStackTrace();
110             }
111         }
112         return null;
113     }
114 
115     public String GetLoginCookie(String url) {
116         CloseableHttpClient httpclient = HttpClients.createDefault();
117         HttpGet httpget = new HttpGet(url);
118         httpget.setHeader("Cookie", cookieStr);
119         httpget.setHeader(
120                 HttpHeaders.USER_AGENT,
121                 "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36");
122         try {
123             response = httpclient.execute(httpget);
124             Header[] headers = response.getAllHeaders();
125             for (Header h : headers) {
126                 String name = h.getName();
127                 String value = h.getValue();
128                 if ("Set-Cookie".equalsIgnoreCase(name)) {
129                     cookieStr = subCookie(value);
130                     return cookieStr;
131                 }
132 
133             }
134         } catch (Exception e) {
135             System.err.println(String.format("HTTP GET error %s",
136                     e.getMessage()));
137         } finally {
138             try {
139                 httpclient.close();
140             } catch (IOException e) {
141                 // e.printStackTrace();
142             }
143         }
144         return "4";// 錯誤碼
145     }
146 
147     public String subCookie(String value) {
148         int end = value.indexOf(";");
149         return value.substring(0, end + 1);
150     }
151 
152     public InputStream GetImage(String url) {
153         InputStream is = null;
154         HttpClient httpclient = new DefaultHttpClient();
155         HttpGet httpGet = new HttpGet(url);
156         if (cookieStr != null)
157             httpGet.setHeader("Cookie", cookieStr);
158         HttpResponse response;
159         try {
160             response = httpclient.execute(httpGet);
161             if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
162                 HttpEntity entity = response.getEntity();
163                 if (entity != null) {
164                     //System.out.println(entity.getContentType());
165                     // 能夠判斷是不是文件數據流
166                     //System.out.println(entity.isStreaming());
167                     // File storeFile = new File("F:\\code.jpg");
168                     // FileOutputStream output = new
169                     // FileOutputStream(storeFile);
170                     // 獲得網絡資源並寫入文件
171                     InputStream input = entity.getContent();
172                     is = input;
173                     // byte b[] = new byte[1024];
174                     // int j = 0;
175                     // while ((j = input.read(b)) != -1) {
176                     // output.write(b, 0, j);
177                     // }
178                     // output.flush();
179                     // output.close();
180                 }
181             }
182         } catch (ClientProtocolException e) {
183             // TODO Auto-generated catch block
184             e.printStackTrace();
185         } catch (IOException e) {
186             // TODO Auto-generated catch block
187             e.printStackTrace();
188         }
189         return is;
190     }

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三、簡單的測試Test類。

 1 package com.debughao.down;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 import java.util.Scanner;
 6 
 7 import org.jsoup.Jsoup;
 8 import org.jsoup.nodes.Document;
 9 import org.jsoup.nodes.Element;
10 import org.jsoup.select.Elements;
11 
12 import com.debughao.bean.Course;
13 
14 public class Test {
15 
16     public static void main(String[] args) {
17         HttpUtils http = new HttpUtils("stat_uuid=1436867409341663197461; uname=qq_rwe4zg5t; uid=3812752; code=LZ8XF1; "
18                 + "authcode=b809MIxLGp8syQcnuAAdIT9PuCEH2%2FuiyvRuuLALSxb6z6iGoM3xcihNJKzHK%2BAZWzVIGFAW0QrBYiSLmHN1qnhi0YQLmBeWeqkJHXh5xsoylWuRCFmRDJZyUtAGr3U; "
19                 + "level_id=3; is_expire=0; domain=debughao; stat_fromWebUrl=; stat_ssid=1439813138264;"
20                 + " connect.sid=s%3A5xux57xcLyCBheevR40DUa0beJD_ok-S.0aTnwfjSvm7A49zydLGbtXy7vdCGfH7lB7MwmZURppQ; "
21                 + "QINGCLOUDELB=37e16e60f0cd051b754b0acf9bdfd4b5d562b81daa2a899c46d3a1e304c7eb2b|VcWiq|VcWiq; "
22                 + "_ga=GA1.2.889563867.1436867384; _gat=1; Hm_lvt_f3c68d41bda15331608595c98e9c3915=1438945833,1438947627,1438995076,1438995133;"
23                 + " Hm_lpvt_f3c68d41bda15331608595c98e9c3915=1439015591; MECHAT_LVTime=1439015591174; MECHAT_CKID=cookieVal=006600143686858016573509; "
24                 + "undefined=; stat_isNew=0");
25         Scanner sc=new Scanner(System.in);
26         String url= sc.nextLine();
27         sc.close();
28         String res = http.Get(url);
29         Document doc = getDocByRes(res);
30         List<Course> videos = getVideoList(doc);
31         for (Course video : videos) {
32             System.out.println(video.getLinkText());
33         }
34         for (Course video : videos) {
35             String urls = video.getLinkHref();
36             String res2 = http.Get(urls);
37             Document doc1 = getDocByRes(res2);
38             getVideoLink(doc1);
39 
40         }
41     }
42 
43     private static Document getDocByRes(String res) {
44         // TODO Auto-generated method stub
45         Document doc = null;
46         doc = Jsoup.parse(res);
47         return doc;
48     }
49 
50     public static List<Course> getVideoList(Element doc) {
51         Elements links;
52         List<Course> courses = new ArrayList<Course>();
53         Course course = null;
54         Elements results1 = doc.getElementsByClass("lessonvideo-list");
55         String title = doc.getElementsByTag("title").text();
56         System.out.println(title);
57         for (Element element : results1) {
58             links = element.getElementsByTag("a");
59             for (Element link : links) {
60                 String linkList = link.attr("href");
61                 String linkText = link.text();
62                 // System.out.println(linkText);
63                 course = new Course();
64                 course.setLinkHref(linkList);
65                 course.setLinkText(linkText);
66                 courses.add(course);
67             }
68         }
69         return courses;
70     }
71 
72     public static void getVideoLink(Document doc) {
73         Elements results2 = doc.select("source");
74         String mp4Links = results2.attr("src");
75         System.out.println(mp4Links);
76     }
77 }

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四、如下是運行結果：

 1 http://www.jikexueyuan.com/course/1748.html  2 自定義 View 基礎和原理-極客學院  3 1.編寫本身的自定義 View（上）  4 2.編寫本身的自定義 View（下）  5 3.加入邏輯線程  6 4.提取和封裝自定義 View  7 5.在 xml 中定義樣式來影響顯示效果  8 http://cv3.jikexueyuan.com/201508082007/99549fa37069a39a2e128278ee60768c/course/1501-1600/1557/video/4278_b_h264_sd_960_540.mp4  9 http://cv3.jikexueyuan.com/201508082007/a068be74f7f31900e128f109523b0925/course/1501-1600/1557/video/4279_b_h264_sd_960_540.mp4 10 http://cv3.jikexueyuan.com/201508082008/bf216e06770e9a9b0adda34ea4d01dfc/course/1501-1600/1557/video/4280_b_h264_sd_960_540.mp4 11 http://cv3.jikexueyuan.com/201508082008/75b51573a75458848136e61e848d1ae7/course/1501-1600/1557/video/4281_b_h264_sd_960_540.mp4 12 http://cv3.jikexueyuan.com/201508082008/ca20fad3e1bc622aa64bbfa7d2b768dd/course/1501-1600/1557/video/5159_b_h264_sd_960_540.mp4