- java.util.zip Package Classes
- java.util.zip - Home
- java.util.zip - Adler32
- java.util.zip - CheckedInputStream
- java.util.zip - CheckedOutputStream
- java.util.zip - CRC32
- java.util.zip - Deflater
- java.util.zip - DeflaterInputStream
- java.util.zip - DeflaterOutputStream
- java.util.zip - GZIPInputStream
- java.util.zip - GZIPOutputStream
- java.util.zip - Inflater
- java.util.zip - InflaterInputStream
- java.util.zip - InflaterOutputStream
- java.util.zip - ZipEntry
- java.util.zip - ZipFile
- java.util.zip - ZipInputStream
- java.util.zip - ZipOutputStream
- java.util.zip Package Extras
- java.util.zip - Exceptions
- java.util.zip - Error
- java.util.zip Useful Resources
- java.util.zip - Quick Guide
- java.util.zip - Useful Resources
- java.util.zip - Discussion
java.util.zip.CRC32.getValue() Method Example
Description
The java.util.zip.CRC32.getValue method returns the checksum value.
Declaration
Following is the declaration for java.util.zip.CRC32.getValue method.
public long getValue()
Returns
the current checksum value.
Pre-requisite
Create a file Hello.txt in D:> test > directory with the following content.
This is an example.
Example
The following example shows the usage of java.util.zip.CRC32.getValue() method.
package com.tutorialspoint; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.zip.CRC32; import java.util.zip.CheckedOutputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; public class CRC32Demo { private static String SOURCE_FILE = "D:\\test\\Hello.txt"; private static String TARGET_FILE = "D:\\test\\Hello.zip"; public static void main(String[] args) { byte[] buffer = new byte[1024]; try { FileOutputStream fout = new FileOutputStream(TARGET_FILE); CheckedOutputStream checksum = new CheckedOutputStream(fout, new CRC32()); ZipOutputStream zout = new ZipOutputStream(checksum); FileInputStream fin = new FileInputStream(SOURCE_FILE); zout.putNextEntry(new ZipEntry(SOURCE_FILE)); int length; while((length = fin.read(buffer)) > 0) { zout.write(buffer, 0, length); } zout.closeEntry(); fin.close(); zout.close(); System.out.println("Zip file generated!"); System.out.println("CRC32 Checksum is : " + checksum.getChecksum().getValue()); } catch(IOException ioe) { System.out.println("IOException : " + ioe); } } }
Let us compile and run the above program, this will produce the following result −
Zip file generated! CRC32 Checksum is : 3847524486
javazip_crc32.htm
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