How to Read Zip File Checksum Value In Java

In this example we are going to see How to Read Zip File Checksum Value In Java.

Java Code:


import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class JavaReadCheckSumZip {
	public static void main(String[] args) throws Exception {
		String zipname = "d.zip";
		CheckedInputStream checksum = new CheckedInputStream(new FileInputStream(zipname), new Adler32());
		ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));
		ZipEntry entry;

		while ((entry = zis.getNextEntry()) != null) {
			System.out.println("Unzipping: " + entry.getName());
			int size;
			byte[] buffer = new byte[2048];

			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(entry.getName()), buffer.length);
			while ((size = zis.read(buffer, 0, buffer.length)) != -1) {
				bos.write(buffer, 0, size);
			}
			bos.flush();
			bos.close();
		}

		zis.close();
		System.out.println("Checksum = " + checksum.getChecksum().getValue());
	}
}

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.zip.Adler32;

import java.util.zip.CheckedInputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

public class JavaReadCheckSumZip {

public static void main(String[] args) throws Exception {

String zipname = "d.zip";

CheckedInputStream checksum = new CheckedInputStream(new FileInputStream(zipname), new Adler32());

ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));

ZipEntry entry;

while ((entry = zis.getNextEntry()) != null) {

System.out.println("Unzipping: " + entry.getName());

int size;

byte[] buffer = new byte[2048];

BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(entry.getName()), buffer.length);

while ((size = zis.read(buffer, 0, buffer.length)) != -1) {

bos.write(buffer, 0, size);

}

bos.flush();

bos.close();

}

zis.close();

System.out.println("Checksum = " + checksum.getChecksum().getValue());

}

Zip File Checksum, Java

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