HttpClient + Jsoup 模拟登陆,解析HTML,信息筛选（广工图书馆）

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HttpClient + Jsoup 模拟登陆,解析HTML获取信息

最近在做一个校园综合Android客户端，主要是想把学校各类网站信息进行整合，放在一个平台上，供学校学生阅览。

思路如下：

拿广东工业大学图书馆网站作为一个例子

实现目标：用个人账号登陆图书馆并获取到个人借阅情况。

登陆地址 http://222.200.98.171:81/login.aspx

这里会用到Chrome的开发者工具（浏览器按F12可以开启）

打开登陆界面的源码,下面是源码中的form标签

<form name="aspnetForm" method="post" action="login.aspx?ReturnUrl=%2fuser%2fuserinfo.aspx" οnsubmit="javascript:return WebForm_OnSubmit();" id="aspnetForm">
<div>
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="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" />
</div><script type="text/javascript">
//<![CDATA[
var theForm = document.forms['aspnetForm'];
if (!theForm) {theForm = document.aspnetForm;
}
function __doPostBack(eventTarget, eventArgument) {if (!theForm.onsubmit || (theForm.onsubmit() != false)) {theForm.__EVENTTARGET.value = eventTarget;theForm.__EVENTARGUMENT.value = eventArgument;theForm.submit();}
}
//]]>
</script><script src="/WebResource.axd?d=kbLQnwjf5uNQN4GcWRC5kD1rIySOzkR3uLyKE5xUO0j4Fa2lQPZwQlk_qYaspRXtlojncSBfRJNkA00qXOMQqsKd8WY1&amp;t=634751988274393221" type="text/javascript"></script><script src="/WebResource.axd?d=nsbO6ZJty6_6fuRufFNYnRiJ-xEoD0xQr70NX6g0v64gngATPLSnyyt7jyZkELLW6THXmh92_m0Y5TyvhES_-JroQeU1&amp;t=634751988274393221" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
function WebForm_OnSubmit() {
if (typeof(ValidatorOnSubmit) == "function" && ValidatorOnSubmit() == false) return false;
return true;
}
//]]>
</script><div><input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWBQKa7ezdCwKOmK5RApX9wcYGAsP9wL8JAqW86pcIaBhXmFYzd5pGDTk/afln2TfArPw=" />
</div>
<input name="ctl00$ContentPlaceHolder1$txtlogintype" type="hidden" id="ctl00_ContentPlaceHolder1_txtlogintype" value="0" />
<div id="Login" class="clearFix"><div class="LoginTitle">登录我的图书馆</div><div class="LeftLogin"><div class="LoginDiv"><div class="loginContent"><div class="loginInfo"><span class="leftInfo">图书证号：</span><span class="rightInfo"><input name="ctl00$ContentPlaceHolder1$txtUsername_Lib" type="text" id="ctl00_ContentPlaceHolder1_txtUsername_Lib" class="txtInput" autocomplete="off" /><span id="ctl00_ContentPlaceHolder1_rfv_UserName_Lib" style="color:Red;display:none;">请输入证号</span></span></div><div class="loginInfo"><span class="leftInfo">密&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;码：</span><span class="rightInfo"><input name="ctl00$ContentPlaceHolder1$txtPas_Lib" type="password" id="ctl00_ContentPlaceHolder1_txtPas_Lib" class="txtInput" /><span id="ctl00_ContentPlaceHolder1_rfv_Password_Lib" style="color:Red;display:none;">请输入密码</span></span></div><div><span id="ctl00_ContentPlaceHolder1_lblErr_Lib"></span></div><div class="loginInfo"><input type="submit" name="ctl00$ContentPlaceHolder1$btnLogin_Lib" value="登录" οnclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;ctl00$ContentPlaceHolder1$btnLogin_Lib&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" id="ctl00_ContentPlaceHolder1_btnLogin_Lib" class="btn" /><input type="button" value="清空" οnclick="rset()" class="btn"/></div></div></div></div><div class="RightDescription"><img src="images/pin.gif" />  <br/>1.  如果您使用的是公共电脑，请在使用完毕后，务必退出登录，以保安全。<br />2.  首次登录，请先<a href="changepas.aspx">修改初始密码</a>。</div></div><script type="text/javascript">
//<![CDATA[
var Page_Validators =  new Array(document.getElementById("ctl00_ContentPlaceHolder1_rfv_UserName_Lib"), document.getElementById("ctl00_ContentPlaceHolder1_rfv_Password_Lib"));
//]]>
</script><script type="text/javascript">
//<![CDATA[
var ctl00_ContentPlaceHolder1_rfv_UserName_Lib = document.all ? document.all["ctl00_ContentPlaceHolder1_rfv_UserName_Lib"] : document.getElementById("ctl00_ContentPlaceHolder1_rfv_UserName_Lib");
ctl00_ContentPlaceHolder1_rfv_UserName_Lib.controltovalidate = "ctl00_ContentPlaceHolder1_txtUsername_Lib";
ctl00_ContentPlaceHolder1_rfv_UserName_Lib.focusOnError = "t";
ctl00_ContentPlaceHolder1_rfv_UserName_Lib.errormessage = "请输入证号";
ctl00_ContentPlaceHolder1_rfv_UserName_Lib.display = "Dynamic";
ctl00_ContentPlaceHolder1_rfv_UserName_Lib.evaluationfunction = "RequiredFieldValidatorEvaluateIsValid";
ctl00_ContentPlaceHolder1_rfv_UserName_Lib.initialvalue = "";
var ctl00_ContentPlaceHolder1_rfv_Password_Lib = document.all ? document.all["ctl00_ContentPlaceHolder1_rfv_Password_Lib"] : document.getElementById("ctl00_ContentPlaceHolder1_rfv_Password_Lib");
ctl00_ContentPlaceHolder1_rfv_Password_Lib.controltovalidate = "ctl00_ContentPlaceHolder1_txtPas_Lib";
ctl00_ContentPlaceHolder1_rfv_Password_Lib.focusOnError = "t";
ctl00_ContentPlaceHolder1_rfv_Password_Lib.errormessage = "请输入密码";
ctl00_ContentPlaceHolder1_rfv_Password_Lib.display = "Dynamic";
ctl00_ContentPlaceHolder1_rfv_Password_Lib.evaluationfunction = "RequiredFieldValidatorEvaluateIsValid";
ctl00_ContentPlaceHolder1_rfv_Password_Lib.initialvalue = "";
//]]>
</script><script type="text/javascript">
//<![CDATA[var Page_ValidationActive = false;
if (typeof(ValidatorOnLoad) == "function") {ValidatorOnLoad();
}function ValidatorOnSubmit() {if (Page_ValidationActive) {return ValidatorCommonOnSubmit();}else {return true;}
}//]]>
</script>
</form>

里面很多代码，我们要从中提取出我们登陆所需要的表单信息，input 和 select 这些标签都是作为登陆表单内容，这里只有input标签我们就提取它就好了，代码如下：

initLoginParmas(String userName,StringpassWord)和getLoginFormData(String url)两个方法

/*** 初始化参数* * @param userName* @param passWord* @return* @throws ParseException* @throws IOException*/public static List<NameValuePair> initLoginParmas(String userName,String passWord) throws ParseException, IOException {List<NameValuePair> parmasList = new ArrayList<NameValuePair>();HashMap<String, String> parmasMap = getLoginFormData(LoginUrl);Set<String> keySet = parmasMap.keySet();for (String temp : keySet) {if (temp.contains("Username")) {parmasMap.put(temp, userName);} else if (temp.contains("txtPas")) {parmasMap.put(temp, passWord);}}Set<String> keySet2 = parmasMap.keySet();System.out.println("表单内容：");for (String temp : keySet2) {System.out.println(temp + " = " + parmasMap.get(temp));}for (String temp : keySet2) {parmasList.add(new BasicNameValuePair(temp, parmasMap.get(temp)));}// System.out.println("initParams \n" + parmasMap);return parmasList;}

/*** 获取登录表单input内容* * @param url* @return* @throws IOException* @throws ParseException*/public static HashMap<String, String> getLoginFormData(String url)throws ParseException, IOException {Document document = Jsoup.parse(getHtml(url));Elements element1 = document.getElementsByTag("form");// 找出所有form表单Element element = element1.select("[method=post]").first();// 筛选出提交方法为post的表单Elements elements = element.select("input[name]");// 把表单中带有name属性的input标签取出HashMap<String, String> parmas = new HashMap<String, String>();for (Element temp : elements) {parmas.put(temp.attr("name"), temp.attr("value"));// 把所有取出的input，取出其name，放入Map中}return parmas;}

最后表单结果是：

表单内容：

ctl00$ContentPlaceHolder1$txtlogintype = 0
__VIEWSTATE = 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
ctl00$ContentPlaceHolder1$txtPas_Lib =密码不告诉你
__EVENTVALIDATION = /wEWBQKa7ezdCwKOmK5RApX9wcYGAsP9wL8JAqW86pcIaBhXmFYzd5pGDTk/afln2TfArPw=
ctl00$ContentPlaceHolder1$txtUsername_Lib = 3110006527
ctl00$ContentPlaceHolder1$btnLogin_Lib = 登录

接下来是要登陆获取权限也就是获取到Cookie

代码如下：

/*** 图书馆登陆* * @param context* @return 返回登陆后的界面Html代码* @throws ClientProtocolException* @throws IOException*/public static String login() throws ClientProtocolException, IOException {List<NameValuePair> parmasList = new ArrayList<NameValuePair>();parmasList = initLoginParmas("3110006527", "2787457");HttpPost post = new HttpPost(LoginUrl);post.getParams().setParameter(ClientPNames.HANDLE_REDIRECTS, false);// 阻止自动重定向，目的是获取第一个ResponseHeader的Cookie和Locationpost.setHeader("Content-Type","application/x-www-form-urlencoded;charset=gbk");// 设置编码为GBKpost.setEntity(new UrlEncodedFormEntity(parmasList, "GBK"));HttpResponse response = new DefaultHttpClient().execute(post);cookie = response.getFirstHeader("Set-Cookie").getValue();// 取得cookie并保存起来// System.out.println("cookie= " + cookie);location = response.getFirstHeader("Location").getValue();// 重定向地址，目的是连接到主页mainUrl = Host + location;// 构建主页地址String html = getHtml(mainUrl);return html;}

登陆获取Cookie时候会遇到返回状态码是302，这个时候Post方法的话，系统会自动重定向到Location地址，这时候你看到的ResponseHeader已经不是你登陆后返回的那个了，而是你访问重定向地址时候返回的ResponseHeader，而cookie是含在登陆时候返回的ResponseHeader里面所以特别要注意添加语句

post.getParams().setParameter(ClientPNames.HANDLE_REDIRECTS,false);

给Post设置参数，这样就会阻止重定向,从而可以获取Cookie和Location(为了访问主页界面)

cookie =response.getFirstHeader("Set-Cookie").getValue();

接下来需要做的是根据Location得到主页地址，用Jsoup去解析主页，分析出我的借书情况的页面地址

接下来我们访问其他网页的时候就需要用到cookie 了，所以在用post或者get方法的时候要调用addHeader（）或者setHeader（）;把Cookie设置进去

	/*** 获取网页HTML源代码* * @param url* @return* @throws ParseException* @throws IOException*/private static String getHtml(String url) throws ParseException,IOException {// TODO Auto-generated method stubHttpGet get = new HttpGet(url);if ("" != cookie) {get.addHeader("Cookie", cookie);}HttpResponse httpResponse = new DefaultHttpClient().execute(get);HttpEntity entity = httpResponse.getEntity();return EntityUtils.toString(entity);}

通过Chrome浏览器分析页面源码，可以看到该标签

 <a href="bookborrowed.aspx" >当前借阅情况和续借</a>

bookborrowed.aspx 这一段就是我们需要的

获取代码如下：

public static void getMyBorrowedBooks() {try {Document document = Jsoup.parse(login());Elements elements1 = document.getElementsContainingOwnText("当前借阅情况和续借");// 通过text关键字找到所要的<a>标签String url = elements1.first().attr("href");borrowedBooksUrl = mainUrl.substring(0,mainUrl.lastIndexOf("/") + 1) + url;// 取值和mainUrl进行拼凑组织借阅情况地址getBookBorrowedData(getHtml(borrowedBooksUrl));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}

获取到借书情况的地址后，我们就去访问这个地址，获取源码。

我们所需要的事这部分的数据（只截取一部分）：

 <tr>            <td width="5%">续满</td><td width="10%">2013-04-10</td><td width="35%"><a href="../bookinfo.aspx?ctrlno=571892" target="_blank">编写高质量代码 [专著]：改善Java程序的151个建议＝Writing solw Java cove：151 suggestons to improve your Java program／秦小波著</a></td><td width="5%"> </td><td width="8%">中文图书</td><td width="7%">A2973844</td><td width="10%">2012-12-05</td></tr><tr>

通过下面代码用Jsoup进行筛选

/*** 获取借书情况具体数据（List<BookEntity>）* * @param src* @return List<BookEntity>*/private static List<BookEntity> getBookBorrowedData(String src) {List<BookEntity> data = new ArrayList<BookEntity>();Document document = Jsoup.parse(src);Element element = document.select("[id=borrowedcontent]").first().getElementsByTag("table").first();Elements elements2 = element.getElementsByTag("tr");for (Element temp2 : elements2) {Elements elements3 = temp2.getElementsByTag("td");BookEntity entity = new test().new BookEntity().setIsFullData(elements3.get(0).text()).setData2Return(elements3.get(1).text()).setName(elements3.get(2).text()).setData2Borrowed(elements3.get(6).text());data.add(entity);}data.remove(0);System.out.println("借书情况\n");for (BookEntity temp : data) {System.out.println(temp.getName() + "\n" + temp.getData2Borrowed()+ "\n" + temp.getData2Return() + "\n"+ temp.getIsFullData());}return data;}

最后打印出来结果是：

借书情况编写高质量代码 [专著]：改善Java程序的151个建议＝Writing solw Java cove：151 suggestons to improve your Java program／秦小波著
2012-12-05
2013-04-10
续满
疯狂Java [专著]：突破程序员基本功的16课／李刚编著
2012-12-05
2013-04-10
续满
程序员修炼之道 [专著]：从小工到专家＝The pragmatic programmer：From journeyman to master：评注版／(美)Andrew Hunt,(美)David Thomas著；周爱民,蔡学镛评注
2012-11-22
2013-04-10
续满
重构：改善既有代码的设计＝Refactoring：improving the design of existing code／(美)Martin Fowler著；熊节译
2012-11-22
2013-04-10
续满
Android高薪之路 [专著]：Android程序员面试宝典／李宁编著
2012-11-29
2013-04-10
续满
Android技术内幕 [专著]·系统卷＝Android internals·System／杨丰盛著
2012-12-04
2013-04-10
续满
我编程, 我快乐 [专著]：程序员职业规划之道＝The passionate programmer：creating a remarkable career in software development／(美) Chad Fowler著；于梦瑄译
2013-01-17
2013-04-17
续满

完整代码：
package moniLogin;import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Set;import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.ClientPNames;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;public class test {private static String LoginUrl = "http://222.200.98.171:81/login.aspx";private static String Host = "http://222.200.98.171:81";private static String mainUrl = "";private static String borrowedBooksUrl = "";private static String cookie = "";private static String location = "";/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubgetMyBorrowedBooks();}public static void getMyBorrowedBooks() {try {Document document = Jsoup.parse(login());Elements elements1 = document.getElementsContainingOwnText("当前借阅情况和续借");// 通过text关键字找到所要的<a>标签String url = elements1.first().attr("href");borrowedBooksUrl = mainUrl.substring(0,mainUrl.lastIndexOf("/") + 1) + url;// 取值和mainUrl进行拼凑组织借阅情况地址getBookBorrowedData(getHtml(borrowedBooksUrl));} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/*** 获取借书情况具体数据（List<BookEntity>）* * @param src* @return List<BookEntity>*/private static List<BookEntity> getBookBorrowedData(String src) {List<BookEntity> data = new ArrayList<BookEntity>();Document document = Jsoup.parse(src);Element element = document.select("[id=borrowedcontent]").first().getElementsByTag("table").first();Elements elements2 = element.getElementsByTag("tr");for (Element temp2 : elements2) {Elements elements3 = temp2.getElementsByTag("td");BookEntity entity = new test().new BookEntity().setIsFullData(elements3.get(0).text()).setData2Return(elements3.get(1).text()).setName(elements3.get(2).text()).setData2Borrowed(elements3.get(6).text());data.add(entity);}data.remove(0);System.out.println("借书情况\n");for (BookEntity temp : data) {System.out.println(temp.getName() + "\n" + temp.getData2Borrowed()+ "\n" + temp.getData2Return() + "\n"+ temp.getIsFullData());}return data;}/*** 图书馆登陆* * @param context* @return 返回登陆后的界面Html代码* @throws ClientProtocolException* @throws IOException*/public static String login() throws ClientProtocolException, IOException {List<NameValuePair> parmasList = new ArrayList<NameValuePair>();parmasList = initLoginParmas("3110006527", "密码不告诉你");HttpPost post = new HttpPost(LoginUrl);post.getParams().setParameter(ClientPNames.HANDLE_REDIRECTS, false);// 阻止自动重定向，目的是获取第一个ResponseHeader的Cookie和Locationpost.setHeader("Content-Type","application/x-www-form-urlencoded;charset=gbk");// 设置编码为GBKpost.setEntity(new UrlEncodedFormEntity(parmasList, "GBK"));HttpResponse response = new DefaultHttpClient().execute(post);cookie = response.getFirstHeader("Set-Cookie").getValue();// 取得cookie并保存起来// System.out.println("cookie= " + cookie);location = response.getFirstHeader("Location").getValue();// 重定向地址，目的是连接到主页mainUrl = Host + location;// 构建主页地址String html = getHtml(mainUrl);return html;}/*** 获取网页HTML源代码* * @param url* @return* @throws ParseException* @throws IOException*/private static String getHtml(String url) throws ParseException,IOException {// TODO Auto-generated method stubHttpGet get = new HttpGet(url);if ("" != cookie) {get.addHeader("Cookie", cookie);}HttpResponse httpResponse = new DefaultHttpClient().execute(get);HttpEntity entity = httpResponse.getEntity();return EntityUtils.toString(entity);}/*** 初始化参数* * @param userName* @param passWord* @return* @throws ParseException* @throws IOException*/public static List<NameValuePair> initLoginParmas(String userName,String passWord) throws ParseException, IOException {List<NameValuePair> parmasList = new ArrayList<NameValuePair>();HashMap<String, String> parmasMap = getLoginFormData(LoginUrl);Set<String> keySet = parmasMap.keySet();for (String temp : keySet) {if (temp.contains("Username")) {parmasMap.put(temp, userName);} else if (temp.contains("txtPas")) {parmasMap.put(temp, passWord);}}Set<String> keySet2 = parmasMap.keySet();System.out.println("表单内容：");for (String temp : keySet2) {System.out.println(temp + " = " + parmasMap.get(temp));}for (String temp : keySet2) {parmasList.add(new BasicNameValuePair(temp, parmasMap.get(temp)));}// System.out.println("initParams \n" + parmasMap);return parmasList;}/*** 获取登录表单input内容* * @param url* @return* @throws IOException* @throws ParseException*/public static HashMap<String, String> getLoginFormData(String url)throws ParseException, IOException {Document document = Jsoup.parse(getHtml(url));Elements element1 = document.getElementsByTag("form");// 找出所有form表单Element element = element1.select("[method=post]").first();// 筛选出提交方法为post的表单Elements elements = element.select("input[name]");// 把表单中带有name属性的input标签取出HashMap<String, String> parmas = new HashMap<String, String>();for (Element temp : elements) {parmas.put(temp.attr("name"), temp.attr("value"));// 把所有取出的input，取出其name，放入Map中}return parmas;}class BookEntity {/*** 书名* */private String name;/*** 可借数*/private String leandableNum;/*** 索引号*/private String callNumber;/*** 作者*/private String writer;/*** 出版社*/private String publisher;/*** 还书时间*/private String data2Return;/*** 借书时间*/private String data2Borrowed;/*** 是否续满*/private String isFullData;public BookEntity() {}public String getName() {return name;}public String getLeandableNum() {return leandableNum;}public String getCallNumber() {return callNumber;}public String getWriter() {return writer;}public String getPublisher() {return publisher;}public BookEntity setName(String name) {this.name = name;return this;}public BookEntity setLeandableNum(String leandableNum) {this.leandableNum = leandableNum;return this;}public BookEntity setCallNumber(String callNumber) {this.callNumber = callNumber;return this;}public BookEntity setWriter(String writer) {this.writer = writer;return this;}public BookEntity setPublisher(String publisher) {this.publisher = publisher;return this;}public String getData2Return() {return data2Return;}public String getData2Borrowed() {return data2Borrowed;}public String getIsFullData() {return isFullData;}public BookEntity setData2Return(String data2Return) {this.data2Return = data2Return;return this;}public BookEntity setData2Borrowed(String data2Borrowed) {this.data2Borrowed = data2Borrowed;return this;}public BookEntity setIsFullData(String isFullData) {this.isFullData = isFullData;return this;}}}

关于Jsoup怎么使用这里就不详细说了，

详细请查阅这个网站：http://www.open-open.com/jsoup/

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