Jsoup无法从html表中提取格式

Question

<tr>

<th align="LEFT" bgcolor="GREY"> <span class="smallfont">Higher-order 
Theorems</span>

</th><th bgcolor="PINK"> <em><a href="\ 
[http://www.tptp.org/CASC/J9/SystemDescriptions.html#Satallax---3.2\] 
(http://www.tptp.org/CASC/J9/SystemDescriptions.html#Satallax-- 
-3.2)">Satallax</a><br><span class="xxsmallfont">3.2</span></em>

</th><th bgcolor="SKYBLUE"> <a href="\ 
[http://www.tptp.org/CASC/J9/SystemDescriptions.html#Satallax---3.3\] 
(http://www.tptp.org/CASC/J9/SystemDescriptions.html#Satallax-- 
-3.3)">Satallax</a><br><span class="xxsmallfont">3.3</span>

</th><th bgcolor="LIME"> <a href="\ 
[http://www.tptp.org/CASC/J9/SystemDescriptions.html#Leo-III---1.3\] 
(http://www.tptp.org/CASC/J9/SystemDescriptions.html#Leo-III-- 
-1.3)">Leo‑III</a><br><span class="xxsmallfont">1.3</span>

</th><th bgcolor="YELLOW"> <a href="\ 
[http://www.tptp.org/CASC/J9/SystemDescriptions.html#LEO-II---1.7.0\] 
(http://www.tptp.org/CASC/J9/SystemDescriptions.html#LEO-II-- 
-1.7.0)">LEO‑II</a><br><span class="xxsmallfont">1.7.0</span>

</th></tr>

So lets say I want to extract bgcolor, align, and what is contained in the span class. So for example GREY,LEFT,Higher-order Theorems.

If I just wanted to extract at the very least bgcolor, but ideally all 3, how would i do so?

So I was attempting to extract just the bgcolor and

I've tried doc.select("tr:contains([bgcolor]"), doc.select(th, [bgcolor), doc.select([bgcolor]), doc.select(tr:containsdata(bgcolor) , as well as doc.select([style]) and all have either returned no output or returned a parse error. I can extract the stuff in the span class just fine but it is more of a problem of also extracting bgcolor and align.

Answer 1

You just need to parse the HTML code you want to scrap into JSOUP and then select the attributes of the HTML tags you want, using the attr selector from JSOUP Elements, and that gives you the value of that attribute for every th tag in the HTML. To retrieve also the text contained between the span tags you need to select the nested span in the th and get the .text() .

    Document document = Jsoup.parse(YOUT HTML GOES HERE);
    System.out.println(document);
    Elements elements = document.select("tr > th");

    for (Element element : elements) {
        String align = element.attr("align");
        String color = element.attr("bgcolor");
        String spanText = element.select("span").text();

        System.out.println("Align is " + align +
                "\nBackground Color is " + color +
                "\nSpan Text is " + spanText);
    }

For any further information feel free to ask me! Hope this helped you!

Updated Answer to comment:

To do that, you'll need to use this line inside the for each loop:

String fullText = element.text();

That way you can get all the text contained between the selected Element tags, but you should look up this blog and fit you desired query to it. I guess you will also need to check if the String is empty or not, and do separate queries for each possible case, using IF conditionals.

That implies having one for this structure: tr > th > span , another for this one: tr > th > em , and another for: tr > th .