java java如何从<div>标签中提取内容
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how to extract content from <div> tag java
提问by kyo21
i have a serious problem. i would like to extract the content from tag such as:
我有一个严重的问题。我想从标签中提取内容，例如：
<div class="main-content">
<div class="sub-content">Sub content here</div>
Main content here </div>
output i would expect is:
我期望的输出是：
Sub content here
Main content here
子内容在这里
主要内容在这里
i've tried using regex, but the result isn't so impressive. By using:
我试过使用正则表达式，但结果并不那么令人印象深刻。通过使用：
Pattern.compile("<div>(\S+)</div>");
would return all the strings before the first <*/div> tag
so, could anyone help me pls?
会返回第一个 <*/div> 标签之前的所有字符串，
所以有人可以帮我吗？
回答by MarcoS
I'd recommend avoiding regex for parsing HTML. You can easily do what you ask by using Jsoup:
我建议避免使用正则表达式来解析 HTML。您可以使用Jsoup轻松完成您的要求：
public static void main(String[] args) {
String html = "<html><head/><body><div class=\"main-content\">" +
"<div class=\"sub-content\">Sub content here</div>" +
"Main content here </div></body></html>";
Document document = Jsoup.parse(html);
Elements divs = document.select("div");
for (Element div : divs) {
System.out.println(div.ownText());
}
}
In response to comment: if you want to put the content of the divelements into an array of Strings you can simply do:
回应评论：如果您想将div元素的内容放入Strings的数组中，您可以简单地执行以下操作：
String[] divsTexts = new String[divs.size()];
for (int i = 0; i < divs.size(); i++) {
divsTexts[i] = divs.get(i).ownText();
}
In response to comment: if you have nested elements and you want to get own text for each element than you can use jquery multiple selector syntax. Here's an example:
回应评论：如果您有嵌套元素并且想要为每个元素获取自己的文本，则可以使用 jquery 多选择器语法。下面是一个例子：
public static void main(String[] args) {
String html = "<html><head/><body><div class=\"main-content\">" +
"<div class=\"sub-content\">" +
"<p>a paragraph <b>with some bold text</b></p>" +
"Sub content here</div>" +
"Main content here </div></body></html>";
Document document = Jsoup.parse(html);
Elements divs = document.select("div, p, b");
for (Element div : divs) {
System.out.println(div.ownText());
}
}
The code above will parse the following HTML:
上面的代码将解析以下 HTML：
<html>
<head />
<body>
<div class="main-content">
<div class="sub-content">
<p>a paragraph <b>with some bold text</b></p>
Sub content here</div>
Main content here</div>
</body>
</html>
and print the following output:
并打印以下输出：
Main content here
Sub content here
a paragraph
with some bold text
回答by Ankit
<div class="main-content" id="mainCon">
<div class="sub-content" id="subCon">Sub content here</div>
Main content here </div>
From this code if you want to get the result you have mentioned
如果您想获得您提到的结果，请从此代码
Use document.getElementById("mainCon").innerHTMLit will give Main content herealong with sub div but you parse that thing.
使用document.getElementById("mainCon").innerHTML它会在此处提供Main 内容和 sub div，但您会解析该内容。
And similarly for sub-div you can use the above code sniplet i.e. document.getElementById("subCon").innerHTML
同样对于 sub-div，您可以使用上面的代码片段，即 document.getElementById("subCon").innerHTML
