How to Parse Or Split Url Address In Kotlin?

To parse or split a URL address in Kotlin, you can use the URL class from the Java standard library.

Here is an example of how you can parse a URL address and access its different components in Kotlin:

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import java.net.URL

fun main() {
    val urlString = "https://www.example.com/path?query=123"

    val url = URL(urlString)

    val protocol = url.protocol
    val host = url.host
    val path = url.path
    val query = url.query

    println("Protocol: $protocol")
    println("Host: $host")
    println("Path: $path")
    println("Query: $query")
}

In this example, we first create a URL object by passing the URL address as a string to its constructor. We can then access the different components of the URL, such as the protocol, host, path, and query, using the methods provided by the URL class.

By using the URL class, you can easily parse and split a URL address in Kotlin.

How to split a URL into different components in Kotlin?

You can split a URL into its different components using the URL class in Kotlin. Here's an example of how you can do it:

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import java.net.URL

fun main() {
    val urlString = "https://www.example.com:8080/path/to/resource?queryparam=value#fragment"

    val url = URL(urlString)

    val protocol = url.protocol
    val domain = url.host
    val port = url.port
    val path = url.path
    val query = url.query
    val fragment = url.ref

    println("Protocol: $protocol")
    println("Domain: $domain")
    println("Port: $port")
    println("Path: $path")
    println("Query: $query")
    println("Fragment: $fragment")
}

When you run this code, it will output the different components of the URL:

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Protocol: https
Domain: www.example.com
Port: 8080
Path: /path/to/resource
Query: queryparam=value
Fragment: fragment

You can access other components of the URL such as authority, userInfo, etc. using the URL class methods.

What is the function to retrieve the path from a URL in Kotlin?

You can retrieve the path from a URL in Kotlin using the URI class provided in the standard Java library. Here is an example code snippet to retrieve the path from a URL:

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import java.net.URI

fun getPathFromUrl(url: String): String {
    val uri = URI(url)
    return uri.path
}

fun main() {
    val url = "https://www.example.com/sample/path"
    val path = getPathFromUrl(url)
    println("Path: $path")
}

In this code snippet, the getPathFromUrl function takes a URL as input, creates a URI object from the URL, and returns the path component of the URL using the path property of the URI object.

What is the function to extract the protocol from a URL in Kotlin?

In Kotlin, you can extract the protocol from a URL using the following function:

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fun extractProtocol(url: String): String {
    val startIndex = url.indexOf("://")
    return if (startIndex != -1) {
        url.substring(0, startIndex)
    } else {
        ""
    }
}

You can call this function with a URL string as the argument, for example:

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fun main() {
    val url = "https://www.example.com"
    val protocol = extractProtocol(url)
    println("Protocol: $protocol") // Output: Protocol: https
}

How to extract the path segments from a URL in Kotlin?

You can use the URI class from the java.net package to extract the path segments from a URL in Kotlin. Here's an example code snippet to achieve this:

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import java.net.URI

fun main() {
    val url = URI("https://www.example.com/path/segment1/segment2")

    val pathSegments = url.path.split("/").filter { it.isNotEmpty() }

    println("Path segments: $pathSegments")
}

In this code snippet, we create a URI object with the URL https://www.example.com/path/segment1/segment2. We then use the split function to split the path of the URL by the "/" delimiter, and then use the filter function to remove any empty segments. Finally, we print out the extracted path segments.

When you run this code, you should see the output:

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Path segments: [path, segment1, segment2]

How to extract the subdomain from a URL in Kotlin?

You can extract the subdomain from a URL in Kotlin by using the following code:

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fun extractSubdomain(url: String): String {
    val domainRegex = """^(?:https?:\/\/)?(?:[^@\n]+@)?(?:www\.)?([^:/\n?]+)""".toRegex()

    val matchResult = domainRegex.find(url)
    val subdomain = matchResult?.groups?.get(1)?.value ?: ""

    return subdomain
}

fun main() {
    val url = "https://subdomain.example.com/path/to/page"
    val subdomain = extractSubdomain(url)
    println("Subdomain: $subdomain")
}

In this code, we define a function extractSubdomain that takes a URL as a parameter and uses a regex pattern to extract the subdomain portion of the URL. The regex pattern """^(?:https?:\/\/)?(?:[^@\n]+@)?(?:www\.)?([^:/\n?]+)""".toRegex() matches the subdomain part of the URL.

We then use the find function to find the match in the URL and extract the subdomain from the match result. Finally, we return the extracted subdomain.