Example 3-1. DigestThread import java.io.*; import java.security.*; import javax.xml.bind.*; // for DatatypeConverter; requires Java 6 or JAXB 1.0 public class DigestThread extends Thread { private String filename; public DigestThread(String filename) { this.filename = filename; } @Override public void run() { 56 | Chapter 3: Threads www.it-ebooks.info try { FileInputStream in = new FileInputStream(filename); MessageDigest sha = MessageDigest.getInstance("SHA-256"); DigestInputStream din = new DigestInputStream(in, sha); while (din.read() != -1) ; din.close();
Rewrite the program in Example 3-1. DigestThread class to output the result of each file on an output file for each one by assigning a new name for the output file.
The language is Java
Example 3-1. DigestThread
import java.io.*;
import java.security.*;
import javax.xml.bind.*; // for DatatypeConverter; requires Java 6 or JAXB 1.0
public class DigestThread extends Thread {
private String filename;
public DigestThread(String filename) {
this.filename = filename;
}
@Override
public void run() {
56 | Chapter 3: Threads
www.it-ebooks.info
try {
FileInputStream in = new FileInputStream(filename);
MessageDigest sha = MessageDigest.getInstance("SHA-256");
DigestInputStream din = new DigestInputStream(in, sha);
while (din.read() != -1) ;
din.close();
byte[] digest = sha.digest();
StringBuilder result = new StringBuilder(filename);
result.append(": ");
result.append(DatatypeConverter.printHexBinary(digest));
System.out.println(result);
} catch (IOException ex) {
System.err.println(ex);
} catch (NoSuchAlgorithmException ex) {
System.err.println(ex);
}
}
public static void main(String[] args) {
for (String filename : args) {
Thread t = new DigestThread(filename);
t.start();
}
}
}
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