Calculate Checksum CRC32 in Java
Description
The following code shows how to calculate Checksum CRC32.
Example
//from w w w . j a v a2s . c o m
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.util.Arrays;
import java.util.zip.CRC32;
public class Main {
public static void main(String[] args) throws Exception{
BufferedInputStream is = new BufferedInputStream(new FileInputStream("a.exe"));
byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) >= 0) {
new CRC32().update(bytes, 0, len);
}
is.close();
System.out.println(Arrays.toString(bytes));
}
}
/*
import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.CRC32;
import java.util.zip.Checksum;
public class Main {
public static void main(String[] args) throws IOException {
FileInputStream fin = new FileInputStream("a.zip");
Checksum cs = new CRC32();
for (int b = fin.read(); b != -1; b = fin.read()) {
cs.update(b);
}
System.out.println(cs.getValue());
fin.close();
}
}
*/