Zip/UnZip Multiple Files In Java

For Zipping a file in Java, we have to

Get the File Stream or Byte Stream
Initialize a ZipOutputStream.
Create a ZipEntry for each files or byte arrays and add it in ZipOutputStream and close the Zip Entry.
Once completed, update the ZipOutputStream by calling finish().
Save it using FileOutputStream or Get the bytearray using ByteArrayOutputStream

[Zipping files in the form of byte array]

[Dynamically add files in the form of byte array to zip file in the form of byte array]

Program to read Files and compress to a zip File

1	Program to read Files and compress to a zip File

 import java.io.BufferedInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipOutputStream;
 
 
 public class ReadFilesAndZip
{
 
 public static void main(String[] args) {
    File files[] = new File[3];
    files[0] = new File("C:/dummy/SampleFile.txt");
    files[1] = new File("C:/dummy/ContentFile.txt");
    files[2] = new File("C:/dummy/ContentFile2.txt");
 
    //byte[]contentInBytes = readFile(files[0]);
    //System.out.println(new String(contentInBytes));
    byte[] zipFileInBytes = zipMultipleFiles(files);
    writeFileInBytes(zipFileInBytes);
 }
 
 /* Read the file content and return in byte array */
 public static byte[] readFile(File file) {
   byte[] fileContent = null;
   BufferedInputStream bis = null;
   try {
    bis = new BufferedInputStream(new FileInputStream(file));
    int fileSize = bis.available();
    fileContent = new byte[fileSize];
    bis.read(fileContent);
    if(bis!=null) {
      bis.close();
    }
   }
   catch (FileNotFoundException e) {
     e.printStackTrace();
   }
   catch (IOException e) {
     e.printStackTrace();
   }
 return fileContent;
 }

 /* This function wii write the input byte array content in the file location.*/
 public static void writeFileInBytes(byte[] ContentInBytes) {
   try {
    FileOutputStream fout = new FileOutputStream("C:/dummy/CompressedFile.zip");
    fout.write(ContentInBytes);
    if(fout!=null) {
     fout.close();
    }
   }
   catch (FileNotFoundException e) {
    e.printStackTrace();
   }
   catch (IOException e) {
    e.printStackTrace();
   }
 }

 /* Zip Multiple Files and return the Zip File in Byte Array., */
 public static byte[] zipMultipleFiles (File[] files) {
   byte[] filesInZip = null;
   ByteArrayOutputStream bOutStream = new ByteArrayOutputStream();
   ZipOutputStream zOutStream = new ZipOutputStream(bOutStream);
   for(int i=0;i<files.length;i++) {
   File tempFile = files[i];
   byte[] fileContentInBytes = readFile(tempFile);
   if(fileContentInBytes!=null && fileContentInBytes.length>0)
   {
     String eachFileName = tempFile.getName();
     ZipEntry ze = new ZipEntry(eachFileName);
     try {
       zOutStream.putNextEntry(ze);
       zOutStream.write(fileContentInBytes,0,
       fileContentInBytes.length);
       zOutStream.closeEntry();
     }
     catch (IOException e) {
       e.printStackTrace();
     }
   }
  }
  try {
   zOutStream.finish();
  }
  catch (IOException e1) {
    e1.printStackTrace();
   }
   filesInZip = bOutStream.toByteArray();
  try {
    zOutStream.close();
   }
   catch (IOException e) {
    e.printStackTrace();
   }
   return filesInZip;
  }
 }

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import java.io.BufferedInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

public class ReadFilesAndZip

{

public static void main(String[] args) {

File files[] = new File[3];

files[0] = new File("C:/dummy/SampleFile.txt");

files[1] = new File("C:/dummy/ContentFile.txt");

files[2] = new File("C:/dummy/ContentFile2.txt");

//byte[]contentInBytes = readFile(files[0]);

//System.out.println(new String(contentInBytes));

byte[] zipFileInBytes = zipMultipleFiles(files);

writeFileInBytes(zipFileInBytes);

}

/* Read the file content and return in byte array */

public static byte[] readFile(File file) {

byte[] fileContent = null;

BufferedInputStream bis = null;

try {

bis = new BufferedInputStream(new FileInputStream(file));

int fileSize = bis.available();

fileContent = new byte[fileSize];

bis.read(fileContent);

if(bis!=null) {

bis.close();

}

catch (FileNotFoundException e) {

e.printStackTrace();

}

catch (IOException e) {

e.printStackTrace();

}

return fileContent;

}

/* This function wii write the input byte array content in the file location.*/

public static void writeFileInBytes(byte[] ContentInBytes) {

try {

FileOutputStream fout = new FileOutputStream("C:/dummy/CompressedFile.zip");

fout.write(ContentInBytes);

if(fout!=null) {

fout.close();

}

catch (FileNotFoundException e) {

e.printStackTrace();

}

catch (IOException e) {

e.printStackTrace();

}

/* Zip Multiple Files and return the Zip File in Byte Array., */

public static byte[] zipMultipleFiles (File[] files) {

byte[] filesInZip = null;

ByteArrayOutputStream bOutStream = new ByteArrayOutputStream();

ZipOutputStream zOutStream = new ZipOutputStream(bOutStream);

for(int i=0;i<files.length;i++) {

File tempFile = files[i];

byte[] fileContentInBytes = readFile(tempFile);

if(fileContentInBytes!=null && fileContentInBytes.length>0)

{

String eachFileName = tempFile.getName();

ZipEntry ze = new ZipEntry(eachFileName);

try {

zOutStream.putNextEntry(ze);

zOutStream.write(fileContentInBytes,0,

fileContentInBytes.length);

zOutStream.closeEntry();

}

catch (IOException e) {

e.printStackTrace();

}

try {

zOutStream.finish();

}

catch (IOException e1) {

e1.printStackTrace();

}

filesInZip = bOutStream.toByteArray();

try {

zOutStream.close();

}

catch (IOException e) {

e.printStackTrace();

}

return filesInZip;

}

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