How to read and write compressed files (ZIP, GZIP, etc.) in Kotlin

How to read and write compressed files (ZIP, GZIP, etc.) in Kotlin.

Here's a step-by-step tutorial on how to read and write compressed files (ZIP, GZIP, etc.) in Kotlin:

Reading Compressed Files

Reading ZIP Files

To read a ZIP file in Kotlin, you can use the java.util.zip.ZipFile class. Here's an example:

import java.util.zip.ZipFile

fun main() {
    val zipFile = ZipFile("path/to/file.zip")
    
    // Get the entries in the ZIP file
    val entries = zipFile.entries()
    
    // Iterate over the entries
    while (entries.hasMoreElements()) {
        val entry = entries.nextElement()
        
        // Read the contents of the entry
        val inputStream = zipFile.getInputStream(entry)
        // Process the inputStream as needed
    }
    
    // Close the ZIP file
    zipFile.close()
}

Reading GZIP Files

To read a GZIP file in Kotlin, you can use the java.util.zip.GZIPInputStream class. Here's an example:

import java.io.FileInputStream
import java.util.zip.GZIPInputStream

fun main() {
    val inputStream = GZIPInputStream(FileInputStream("path/to/file.gz"))
    
    // Read the contents of the GZIP file
    // Process the inputStream as needed
    
    // Close the GZIP file
    inputStream.close()
}

Writing Compressed Files

Writing ZIP Files

To write a ZIP file in Kotlin, you can use the java.util.zip.ZipOutputStream class. Here's an example:

import java.io.FileOutputStream
import java.util.zip.ZipEntry
import java.util.zip.ZipOutputStream

fun main() {
    val zipFile = ZipOutputStream(FileOutputStream("path/to/file.zip"))
    
    // Create a new entry in the ZIP file
    val entry = ZipEntry("file.txt")
    zipFile.putNextEntry(entry)
    
    // Write the contents to the entry
    // Process the outputStream as needed
    
    // Close the entry
    zipFile.closeEntry()
    
    // Close the ZIP file
    zipFile.close()
}

Writing GZIP Files

To write a GZIP file in Kotlin, you can use the java.util.zip.GZIPOutputStream class. Here's an example:

import java.io.FileOutputStream
import java.util.zip.GZIPOutputStream

fun main() {
    val outputStream = GZIPOutputStream(FileOutputStream("path/to/file.gz"))
    
    // Write the contents to the GZIP file
    // Process the outputStream as needed
    
    // Close the GZIP file
    outputStream.close()
}

That's it! You now know how to read and write compressed files (ZIP, GZIP, etc.) in Kotlin.

Reading Compressed Files​

Reading ZIP Files​

Reading GZIP Files​

Writing Compressed Files​

Writing ZIP Files​

Writing GZIP Files​