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

 

 

 

 

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" onsubmit="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" onclick="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" onclick="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Location
        post.setHeader("Content-Type",
                "application/x-www-form-urlencoded;charset=gbk");
        // 设置编码为GBK
        post.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 stub
    HttpGet 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 block
            e.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

<strong>完整代码：</strong>
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 stub
        getMyBorrowedBooks();
    }

    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 block
            e.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Location
        post.setHeader("Content-Type",
                "application/x-www-form-urlencoded;charset=gbk");
        // 设置编码为GBK
        post.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 stub
        HttpGet 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/