CODEWITHSUNDEEP
java
Fernanda Brum Lousada
Fernanda Brum Lousada

Reputation: 371

Parsing Http response by specific word in java?

Got an http response I need to parse, more precisely I wanna get a part of the response based on a tag. Let's say:

<div class="row"><span>some text<pre>% Copyright (c) </pre></span></div>

So I'd pass "pre" and the parser would return the block between 

<pre></pre>.

Is there a better way to do this in java? I don't understand if HttpMessageParser could do it for me.

Thanks in advance!

Upvotes: 0

Views: 276

Answers (3)

SomeDude
SomeDude

Reputation: 14228

Your input seems to be a valid xml, using XPath is a easy and clean approach :

The xpath would be //pre/text() - searches for pre and retrieves its text content.

    String input = "<div class=\"row\"><span>some text<pre>% Copyright (c) </pre></span></div>";

   XPathFactory xPathFactory = XPathFactory.newInstance();
   XPath xpath = xPathFactory.newXPath();

    try {
        XPathExpression expr = xpath.compile( "//pre/text()" );
        Object output = expr.evaluate( new InputSource(new StringReader(input)), XPathConstants.STRING);

        System.out.println(output.toString());
    } catch (XPathExpressionException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
    }

Upvotes: 0

Code-Apprentice
Code-Apprentice

Reputation: 83517

I don't think HttpMessageParser is the correct tool here because this is intended for parsing HTTP messages regardless of whether they contain HTML. For simple parsing, you can use methods from the String class, such as substring() and indexOf(). For a bit more complex parsing, you can use regular expressions. If you need something that actually recognizes HTML syntax, I suggest that you google for an HTML parser library.

Upvotes: 2

Imesha Sudasingha
Imesha Sudasingha

Reputation: 3570

Assuming there can be only one pre tag in the response, you can use the substring method to get what you want.

String response="<div class=\"row\"><span>some text<pre>% Copyright (c) </pre></span></div>";

String insidePre=response.substring(response.indexOf("<pre>")+4,response.indexOf("</pre>"));

Upvotes: 2

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