我希望能够使用任何Html解析器提取contentPlaceHolder的代码。
问题是,我需要一个网址,但因为它是一个主页,我不能拥有它。
实际上有一个select
标签,您可以在其中选择一个选项,当您选择一个选项时,它会加载一个contentPlaceHolder。我想从contentPlaceHolder中提取代码。
注意:我没有建立网站。
以下是一些可以更好地解释它的图片:
这是主页。
这是内容(当你按下红色标志时):
我希望明白...... 谢谢!
答案 0 :(得分:1)
首先,这需要JSoup。
try {
// Regexp pattern used to strip the links
Pattern p = Pattern.compile("\'([^\']*)\'");
// First, let's find the IFRAME from the main page
Document doc = Jsoup.connect("http://blich.co.il/timetable-shahaf").get();
Elements iframe = doc.select("iframe");
if (!iframe.isEmpty()) {
String src = iframe.get(0).absUrl("src");
if (!TextUtils.isEmpty(src)) {
// Now we need to fetch the contents of the IFRAME
doc = Jsoup.connect(src).get();
// This is where we manipulate the <select ..> statement. There's only
// one on this page, so this will be done quick and dirty
Elements selects = doc.select("select.HeaderClasses");
Elements options = selects.select("option");
if (!options.isEmpty()) {
// There's a lot of options here.. dunno what they mean, so let's just
// select a **random** and go with that. Your code should probably let the user
// choose from a dialog or something.
Collections.shuffle(options);
Element option = options.get(0);
String name=selects.get(0).attr("name");
if (!TextUtils.isEmpty(name)) {
doc = Jsoup.connect(src)
.data("__EVENTTARGET", name)
.data("__EVENTARGUMENT", "")
.data(name, option.attr("value")) // Add random option value
.data("__VIEWSTATE",
doc.select("input#__VIEWSTATE").attr("value"))
.data("__LASTFOCUS", "")
.post();
}
}
// All the relevant links are stored in a td with the class "HeaderCell"
Elements links = doc.select("td.HeaderCell a");
for (Element link : links) {
// These are all links to a silly java-script method, _doPostBack(..)
// function __doPostBack(eventTarget, eventArgument) {
// if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
// theForm.__EVENTTARGET.value = eventTarget;
// theForm.__EVENTARGUMENT.value = eventArgument;
// theForm.submit();
// }
// }
// The important bits appear to be eventTarget and eventArgument at least,
// but none of the links define an eventArgument in any case - so we just
// need "eventTarget".
// Naïve splitting, take the first quoted string
Matcher m = p.matcher(link.attr("href"));
if (m.find()) {
String eventTarget = m.group(1);
// The eventTarget you're looking for ends with 'ChangesTable'
if (eventTarget != null && eventTarget.endsWith("ChangesTable")) {
// Now we need to do a POST :-D - this API requires us to retain
// __VIEWSTATE - so we need to post that to.
doc = Jsoup.connect(src)
.data("__EVENTTARGET", eventTarget)
.data("__EVENTARGUMENT", "")
.data("__VIEWSTATE",
doc.select("input#__VIEWSTATE").attr("value"))
.data("__LASTFOCUS", "")
.post();
// All the lesson information is stored in a div with the class
// TTLesson, so let's select those
Elements lessons = doc.select("div.TTLesson");
if (lessons.isEmpty()) {
Log.w(TAG, "Unable to list any lessons");
} else {
for (Element lesson : lessons) {
// This is were knowledge of Hebrew would come in handy -
// but this will list all lessons. You should be able
// to figure out how to find the one you want.
System.out.println(lesson);
}
}
}
}
}
} else {
Log.w(TAG, "Unable to find iframe src");
}
} else {
Log.w(TAG, "Unable to find iframe");
}
} catch (IOException e) {
Log.w(TAG, "Error reading timetable", e);
}
这将列出您想要的页面上的所有课程。我会离开找到正确的教训,因为我不太了解希伯来语以辨别任何细胞包含的内容。
编辑:现在,该示例将随机选择&lt; select&gt;中的选项并刷新页面。