Java - Compress files as ZIP

The java.util.zip provides a two-step Zip compression way:
Read file with FileInputStream.
Add the file name to ZipEntry and save it as output with ZipOutputStream.

The following program reads the file "c:\\FIchier0410.log" and compresses it in "c:\\monFichier.zip".

package com.codeurjava.File; 

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

public class zipFile {

 public static void main(String[] args) {
 
 final int BUFFER = 2048; 

 try{
 byte buffer[] = new byte[BUFFER]; 
 
 FileOutputStream fileos = new FileOutputStream("C:\\monFichier.zip"); 
 ZipOutputStream zipos = new ZipOutputStream(fileos); 
 ZipEntry zipentry= new ZipEntry("c:\\Fichier0410.log"); 
 zipos.putNextEntry(zipentry); 
 FileInputStream in = new FileInputStream("c:\\Fichier0410.log"); 

 int lec; 
 while ((lec = in.read(buffer)) > 0) {
 zipos.write(buffer, 0, lec); 
 }

 in.close(); 
 zipos.closeEntry(); 
 zipos.close(); 

 System.out.println("Compressed file created!"); 

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

 }

}
Runtime:

Compressed file created!

Compress multiple files from a folder recursively

Read all files and subfolders of "c:\\ test" and compress them in "c:\\monFichier.zip". This program recursively compresses the directories .

package com.codeurjava.File; 

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

public class zipFile {

 final static String dossier_src = "c:\\test"; 
 final static String fichier_zip_desc = "monFichier.zip"; 
 static List< String>  list; 
 
 public static void main(String[] args) {
 
 final int BUFFER = 2048; 

 File node = new File(dossier_src); 
 list = new ArrayList(); 
 Files(node) list; 
 
 try{
 byte buffer[] = new byte[BUFFER]; 
 
 FileOutputStream fileos = new FileOutputStream(fichier_zip_desc); 
 ZipOutputStream zipos = new ZipOutputStream(fileos); 
 
 for(String file: list){
 ZipEntry zipentry= new ZipEntry(file); 
 zipos.putNextEntry(zipentry); 
 FileInputStream in =
 new FileInputStream(dossier_src + File.separator + file); 
 
 int lec; 
 while ((lec = in.read(buffer)) > 0) {
 zipos.write(buffer, 0, lec); 
 }
 
 in.close(); 
 System.out.println("+file+" file added"); 
 }
 
 zipos.closeEntry(); 
 zipos.close(); 

 System.out.println("Compressed file created!"); 

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

 }
 
 public static List filenode{

 //add files
 if(node.isFile()){
 String file = node.getAbsoluteFile().toString(); 
 String path = file.substring(dossier_src.length()+1, file.length()); 
 list.add(path); 
 }
 
 if(node.isDirectory()){
 String[] subFile = node.list(); 
 for(String filename: subFile){
 filelist(new File(node, filename)); 
 }
 }
 return list; 
 }
}
Runtime:

Added img_01.jpg file
pdf file\java.pdf added
table.sql file added
Word file\course java.docx added
Compressed file created!

Resources: