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>
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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!" );
}
}
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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);
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总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,谢谢大家对服务器之家的支持。如果你想了解更多相关内容请查看下面相关链接
原文链接:https://blog.csdn.net/moneyshi/article/details/78799949