我想解析一个html源代码字符串以在Java中查找特定标记

Question

所以我有以下html源代码:

<form action='http://example.com' method='get'>

        <P>Some example text here.</P>
        <input type='text' class='is-input' id='agent_name' name='deviceName' placeholder='Device Name'>
        <input type='hidden' name='p' value='firefox'>
        <input type='hidden' name='email' value='example@example.com'>
        <input type='hidden' name='k' value='cITBk236gyd56oiY0fhk6lpuo9nt61Va'>
        <p><input type='submit' class='btn-blue' style='margin-top:15px;' value='Install'></p>
</form>

不幸的是,这个html源代码保存为字符串.我想用jsoup之类的东西来解析它.并获取以下字符串: <input type='hidden' name='k' value='cITBk236gyd56oiY0fhk6lpuo9nt61Va'>

或者更好的是,只获取以下值: cITBk236gyd56oiY0fhk6lpuo9nt61Va

我遇到的问题是:

a)该值:cITBk236gyd56oiY0fhk6lpuo9nt61Va一直在变化我无法找到整个html标签.

所以,我正在寻找一种更好的方法来做到这一点.以下是我目前看来不起作用的内容:

//tried use thing, but java was angry for some reason
Jsoup.parse(myString);

// so I used this instead. 
org.jsoup.nodes.Document doc = Jsoup.parse(myString);

// in this case I just tried to select the entire tag. Elements
elements = doc.select("<input name=\"k\"
value=\"cITBkdxJTFd56oiY0fhk6lUu8Owt61Va\" type=\"hidden\">");

//yeah this does not seem to work. I assume it's not a string anymorebut a document. Not sure if it 
//would attempt to print anyway.
System.out.println(elements);

所以我想我不能使用select,但即使这样也行.我不知道如何选择标签的那一部分并将其放入一个新的字符串中.

Answer 1

你可以试试这种方式

Document doc = Jsoup.parse(myString);
Elements elements = doc.select("input[name=k]");
System.out.println(elements.attr("value"));

输出:

cITBk236gyd56oiY0fhk6lpuo9nt61Va