How to Parse Html Output to Object In Kotlin?

10 minutes read

To parse HTML output to an object in Kotlin, you can use libraries such as JSoup or KXmlParser. JSoup is a popular HTML parsing library that allows you to easily extract data from HTML documents and convert it into Java objects. KXmlParser is a lightweight XML parser that can also be used to parse HTML documents in Kotlin.


To parse HTML output using JSoup, you can use the following code snippet:

1
2
3
val doc = Jsoup.parse(htmlString)
val title = doc.title()
val body = doc.body().text()


This code snippet first parses the HTML string into a JSoup Document object. You can then extract specific elements from the HTML document, such as the title and body content, using JSoup's API.


Alternatively, if you prefer to use KXmlParser for parsing HTML output, you can do so by creating an instance of the XmlPullParser and reading the HTML content:

1
2
3
4
5
6
7
8
val parser = KXmlParser()
parser.setInput(StringReader(htmlString))
parser.next()

while (parser.eventType != XmlPullParser.END_DOCUMENT) {
    // Process HTML content here
    parser.next()
}


In this code snippet, the KXmlParser is used to parse the HTML string into an object in Kotlin. You can then process the HTML content within the while loop based on the parser's event type.


Overall, parsing HTML output to an object in Kotlin can be achieved using libraries such as JSoup or KXmlParser, which provide convenient APIs for extracting data from HTML documents and converting it into Kotlin objects.

Best Kotlin Books to Read in 2024

1
Atomic Kotlin

Rating is 5 out of 5

Atomic Kotlin

2
Head First Android Development: A Learner's Guide to Building Android Apps with Kotlin

Rating is 4.9 out of 5

Head First Android Development: A Learner's Guide to Building Android Apps with Kotlin

3
Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

Rating is 4.8 out of 5

Kotlin Programming: The Big Nerd Ranch Guide (Big Nerd Ranch Guides)

4
Kotlin in Action

Rating is 4.7 out of 5

Kotlin in Action

5
Kotlin Design Patterns and Best Practices: Build scalable applications using traditional, reactive, and concurrent design patterns in Kotlin, 2nd Edition

Rating is 4.6 out of 5

Kotlin Design Patterns and Best Practices: Build scalable applications using traditional, reactive, and concurrent design patterns in Kotlin, 2nd Edition

6
Head First Kotlin: A Brain-Friendly Guide

Rating is 4.5 out of 5

Head First Kotlin: A Brain-Friendly Guide

7
Kotlin Cookbook: A Problem-Focused Approach

Rating is 4.4 out of 5

Kotlin Cookbook: A Problem-Focused Approach

8
How to Build Android Apps with Kotlin: A practical guide to developing, testing, and publishing your first Android apps, 2nd Edition

Rating is 4.3 out of 5

How to Build Android Apps with Kotlin: A practical guide to developing, testing, and publishing your first Android apps, 2nd Edition

9
Modern Android 13 Development Cookbook: Over 70 recipes to solve Android development issues and create better apps with Kotlin and Jetpack Compose

Rating is 4.2 out of 5

Modern Android 13 Development Cookbook: Over 70 recipes to solve Android development issues and create better apps with Kotlin and Jetpack Compose

10
Java to Kotlin: A Refactoring Guidebook

Rating is 4.1 out of 5

Java to Kotlin: A Refactoring Guidebook


How do I convert HTML to Kotlin object using Jsoup?

To convert HTML to a Kotlin object using Jsoup, you can follow these steps:

  1. Add Jsoup dependency to your project. You can do this by adding the following line to your build.gradle file:
1
implementation 'org.jsoup:jsoup:1.14.2'


  1. Load your HTML content using Jsoup and parse it into a Document object. Here is an example:
1
2
val html = "<html><head><title>Sample HTML</title></head><body><h1>Hello Jsoup</h1></body></html>"
val document = Jsoup.parse(html)


  1. Extract the information you need from the Document object and create a Kotlin object. For example, if you want to extract the title of the HTML content, you can do the following:
1
val title = document.title()


  1. You can then create a Kotlin data class or any other type of object to hold the extracted information. Here is an example:
1
2
3
data class HtmlContent(val title: String)

val htmlContent = HtmlContent(title)


By following these steps, you can convert HTML content into a Kotlin object using Jsoup.


How to integrate HTML parsing functionality into a Kotlin application?

To integrate HTML parsing functionality into a Kotlin application, you can use a library such as Jsoup. Jsoup is a popular Java library for parsing HTML and XML documents. Here's how you can integrate Jsoup into your Kotlin application:

  1. Add Jsoup as a dependency in your project. You can do this by adding the following line to your build.gradle file:
1
2
3
dependencies {
    implementation 'org.jsoup:jsoup:1.14.1'
}


  1. Use Jsoup to parse HTML documents in your Kotlin code. Here's an example of how you can use Jsoup to parse an HTML document from a URL:
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
import org.jsoup.Jsoup

fun main() {
    val url = "https://example.com"
    val doc = Jsoup.connect(url).get()

    val title = doc.title()
    println("Title: $title")

    val paragraphs = doc.select("p")
    for (paragraph in paragraphs) {
        println("Paragraph: ${paragraph.text()}")
    }
}


In this example, we first connect to the URL and retrieve the HTML document using Jsoup.connect(url).get(). We then extract the title of the document using doc.title() and print it out. Finally, we extract all paragraphs from the document using doc.select("p") and print out their text content.


By following these steps, you can easily integrate HTML parsing functionality into your Kotlin application using Jsoup.


How to convert HTML links to objects in Kotlin?

To convert HTML links to objects in Kotlin, you can create a data class that represents the link object. Here is an example of how you can achieve this:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
data class HTMLLink(val href: String, val text: String)

fun parseHTMLLinks(html: String): List<HTMLLink> {
    val links = mutableListOf<HTMLLink>()
    val pattern = "<a.*?href=\"(.*?)\".*?>(.*?)</a>".toRegex()

    pattern.findAll(html).forEach { matchResult ->
        val href = matchResult.groupValues[1]
        val text = matchResult.groupValues[2]
        links.add(HTMLLink(href, text))
    }

    return links
}

// Example usage
val html = "<a href='https://example.com'>Example Link</a>"
val links = parseHTMLLinks(html)
links.forEach {
    println("Link - URL: ${it.href}, Text: ${it.text}")
}


In this code snippet, we create a data class HTMLLink that represents a link with the href attribute and the link text. We then define a function parseHTMLLinks that takes an HTML string as input and uses a regex pattern to extract the href and text of each link. Finally, we convert the matches to instances of the HTMLLink class and return a list of link objects.


You can now call the parseHTMLLinks function with your HTML string to get a list of link objects that you can work with in Kotlin.

Facebook Twitter LinkedIn Whatsapp Pocket

Related Posts:

To import Kotlin functions into Java classes, first you need to create a Kotlin file with the functions you want to use. Make sure to mark these functions as @JvmStatic so they can be accessed statically in Java. Next, compile your Kotlin file into a .jar file...
When building a library with Vite, you can set multiple outputs by using the output option in the vite.config.js file. This allows you to generate multiple builds of your library with different configurations, such as different file formats or target environme...
In Vite, you can include HTML partials using the built-in vite-plugin-html plugin. This plugin allows you to create HTML templates and include them in your main HTML file. To include a partial, you simply create a separate HTML file with the content you want t...