Creating a zip file in Java

Java Code Example: Create a zip file in Java

Steps:

• Create an input stream from the file to compress
• Read from it we write the contents to an output stream.
• Output stream is of type ZipOutputStream which takes an FileOutputStream as parameter.
• Add a zip entry to the output stream before we start writing to it.
• Clean up by closing the zip entry and both the input stream and output stream.
  

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
*
* @author javadb.com
*/
public class Main {

/**
* Creates a zip file
*/
public void createZipFile() {

try {
String inputFileName = "test.txt";
String zipFileName = "compressed.zip";

//Create input and output streams
FileInputStream inStream = new FileInputStream(inputFileName);
ZipOutputStream outStream = new ZipOutputStream(new
FileOutputStream(zipFileName));

// Add a zip entry to the output stream
outStream.putNextEntry(new ZipEntry(inputFileName));

byte[] buffer = new byte[1024];
int bytesRead;

//Each chunk of data read from the input stream
//is written to the output stream
while ((bytesRead = inStream.read(buffer)) > 0) {
outStream.write(buffer, 0, bytesRead);
}

//Close zip entry and file streams
outStream.closeEntry();

outStream.close();
inStream.close();

} catch (IOException ex) {
ex.printStackTrace();
}
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new Main().createZipFile();
}
}