JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: How to zip multiple files?


Description:

Below example shows how to zip multiple files using ZipOutputStream class. putNextEntry() method starts adding into the zip, and ZipEntry represents a file entry into the zip.


Code:
package com.java2novice.zip;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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 MyMultipleFileZip {

	public void zipFiles(List<String> files){
		
		FileOutputStream fos = null;
        ZipOutputStream zipOut = null;
        FileInputStream fis = null;
		try {
			fos = new FileOutputStream("C:/testing.zip");
			zipOut = new ZipOutputStream(new BufferedOutputStream(fos));
			for(String filePath:files){
				File input = new File(filePath);
				fis = new FileInputStream(input);
				ZipEntry ze = new ZipEntry(input.getName());
				System.out.println("Zipping the file: "+input.getName());
				zipOut.putNextEntry(ze);
				byte[] tmp = new byte[4*1024];
				int size = 0;
				while((size = fis.read(tmp)) != -1){
					zipOut.write(tmp, 0, size);
				}
				zipOut.flush();
				fis.close();
			}
			zipOut.close();
			System.out.println("Done... Zipped the files...");
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally{
			try{
				if(fos != null) fos.close();
			} catch(Exception ex){
				
			}
		}
	}
	
	public static void main(String a[]){
		
		MyMultipleFileZip mfe = new MyMultipleFileZip();
		List<String> files = new ArrayList<String>();
		files.add("C:/test.txt");
		files.add("C:/test.sh");
		files.add("C:/port-chn.txt");
		mfe.zipFiles(files);
	}
}


Output:
Zipping the file: test.txt
Zipping the file: test.sh
Zipping the file: port-chn.txt
Done... Zipped the files...
<< Previous Program | Next Program >>

List of all java.util.zip class sample examples:

  1. How to compress byte array in java?
  2. How to decompress byte array in java?
  3. How to zip a single file?
  4. How to zip multiple files?
  5. How to read zip files entries or file name list?
  6. How to unzip files in java?
  7. How to generate checksum value for for a file in java?
  8. How to compress and store objects using zip utility?
  9. How to decompress the compressed objects using zip utility?
  10. How to zip a file using ZipFile class?
  11. How to compress a file in GZip format?
  12. How to uncompress a file from GZip format?
Knowledge Centre
Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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