之前看过某个同学的一篇有关与使用JSoup解析学校图书馆的文章,仔细一看,发现竟然是同校!!既然对方用的是java,那么我也就来个C#好了,虽然我的入门语言是java。
C#没有JSoup这样方便的东西,我也没有仔细去找,因为只要利用正则表达式,同样可以很好的解析网页内容而不需要其他帮助。现在做前端的程序员,如果正则表达式不熟悉,反而去依赖第三方的话,感觉很可惜!
这是我们学校图书馆的登录界面的body:
<body onload="bodyload()"> <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=aUGQsxtqBlPCYSLCotjFAgPO7LVRMgZpwdLaRZWG0_6ihSU9GEuAV24Gz4casq4yN9Ey0mGcWUzl2dmajXQUJps-v9o1&t=635090739058261250" type="text/javascript"></script> <script src="/WebResource.axd?d=ID2SHi1EXLOLcv8QZV5z65ofzpfIKQP67HbOJyDtBOZGRBT6-d--Al86w9CE4E-H3dCnvuE2ZcqgPXnod-92Tv-ZeIo1&t=635090739058261250" 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="/wEWBQLuwfDDAwKOmK5RApX9wcYGAsP9wL8JAqW86pcI915B4NnPkyRLP7m6znmysZd+180=" /> </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 码:</