最近要弄一个爬虫程序,想着先来个简单的模拟登陆, 在权衡jxbrowser
和htmlunit
两种技术, jxbowser
有界面呈现效果,但是对于某些js跳转之后的效果获取比较繁琐。
随后考虑用htmlunit
, 想着借用咱们csnd的登陆练练手。谁知道csdn的登陆,js加载时间超长,不设置长一点的加载时间,按钮提交根本没效果,js没生效。 具体看代码注释吧。 奉劝做爬虫的同志们,千万别用csdn登陆练手,坑死我了。
maven
配置如下:
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<dependencies> <!-- https: //mvnrepository.com/artifact/net.sourceforge.htmlunit/htmlunit --> <dependency> <groupid>net.sourceforge.htmlunit</groupid> <artifactid>htmlunit</artifactid> <version> 2.18 </version> </dependency> <!-- https: //mvnrepository.com/artifact/org.jsoup/jsoup --> <dependency> <groupid>org.jsoup</groupid> <artifactid>jsoup</artifactid> <version> 1.9 . 2 </version> </dependency> </dependencies> |
代码如下:
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package com.test; import java.io.ioexception; import java.net.malformedurlexception; import java.util.hashmap; import java.util.map; import java.util.set; import com.gargoylesoftware.htmlunit.browserversion; import com.gargoylesoftware.htmlunit.failinghttpstatuscodeexception; import com.gargoylesoftware.htmlunit.nicelyresynchronizingajaxcontroller; import com.gargoylesoftware.htmlunit.silentcsserrorhandler; import com.gargoylesoftware.htmlunit.webclient; import com.gargoylesoftware.htmlunit.html.htmlbuttoninput; import com.gargoylesoftware.htmlunit.html.htmlform; import com.gargoylesoftware.htmlunit.html.htmlpage; import com.gargoylesoftware.htmlunit.html.htmlpasswordinput; import com.gargoylesoftware.htmlunit.html.htmltextinput; import com.gargoylesoftware.htmlunit.util.cookie; public class simulatelogin { //访问的目标网址(csdn) private static string target_url = "https://passport.csdn.net/account/login?from=http://www.csdn.net" ; public static void main(string[] args) throws failinghttpstatuscodeexception, malformedurlexception, ioexception { // 模拟一个浏览器 webclient webclient = new webclient(browserversion.chrome); // 设置webclient的相关参数 webclient.setcsserrorhandler( new silentcsserrorhandler()); //设置ajax webclient.setajaxcontroller( new nicelyresynchronizingajaxcontroller()); //设置支持js webclient.getoptions().setjavascriptenabled( true ); //css渲染禁止 webclient.getoptions().setcssenabled( false ); //超时时间 webclient.getoptions().settimeout( 50000 ); //设置js抛出异常:false webclient.getoptions().setthrowexceptiononscripterror( false ); //允许重定向 webclient.getoptions().setredirectenabled( true ); //允许cookie webclient.getcookiemanager().setcookiesenabled( true ); // 模拟浏览器打开一个目标网址 htmlpage page = webclient.getpage(target_url); /**等待js加载完全,csdn这点 特别坑,js加载时间超长!!!!!!! 后人切记不要用csdn模拟登陆!!!!!!!**/ webclient.waitforbackgroundjavascript( 10000 * 3 ); // 根据form的名字获取页面表单,也可以通过索引来获取:page.getforms().get(0) htmlform form = (htmlform) page.getelementbyid( "fm1" ); htmltextinput username = (htmltextinput) form.getinputbyname( "username" ); htmlpasswordinput password = (htmlpasswordinput) form.getinputbyname( "password" ); username.setvalueattribute( "********" ); //用户名 password.setvalueattribute( "********" ); //密码 htmlbuttoninput button = (htmlbuttoninput) page.getbyxpath( "//input[contains(@class, 'logging')]" ).get( 0 ); // scriptresult result = page.executejavascript("javascript:document.getelementsbyclassname('logging')[0].click()"); // htmlpage retpage = (htmlpage) result.getnewpage(); htmlpage retpage = button.click(); // 等待js驱动dom完成获得还原后的网页 webclient.waitforbackgroundjavascript( 1000 ); //输出跳转网页的地址 system.out.println(retpage.geturl().tostring()); //输出跳转网页的内容 system.out.println(retpage.asxml()); //获取cookie set<cookie> cookies = webclient.getcookiemanager().getcookies(); map<string, string> responsecookies = new hashmap<string, string>(); for (cookie c : cookies) { responsecookies.put(c.getname(), c.getvalue()); system.out.print(c.getname()+ ":" +c.getvalue()); } webclient.close(); system.out.println( "success!" ); } } |
另外,csdn的js总是莫名其妙的报一堆错,如果不想看,想忽略的话,在创建webclient
前加上如下代码:
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//设置日志级别,原页面js异常不打印 logfactory.getfactory().setattribute( "org.apache.commons.logging.log" , "org.apache.commons.logging.impl.nooplog" ); java.util.logging.logger.getlogger( "com.gargoylesoftware.htmlunit" ) .setlevel(level.off); java.util.logging.logger.getlogger( "org.apache.commons.httpclient" ) .setlevel(level.off); |
总结
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原文链接:https://blog.csdn.net/moneyshi/article/details/78799949