Java Hash Calculate getHash(File file, String hashType)

Description

get Hash

License

Apache License

Declaration

private static String getHash(File file, String hashType) throws Exception 

Method Source Code

//package com.java2s;
// Licensed under the Apache License, Version 2.0 (the "License");

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;

public class Main {
    private static String getHash(File file, String hashType) throws Exception {
        InputStream fis = new FileInputStream(file);
        byte buffer[] = new byte[1024];
        MessageDigest md5 = MessageDigest.getInstance(hashType);
        for (int numRead = 0; (numRead = fis.read(buffer)) > 0;) {
            md5.update(buffer, 0, numRead);
        }//from   w  w  w.j a v a2s  . co m

        fis.close();
        return toHexString(md5.digest());
    }

    private static String toHexString(byte b[]) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < b.length; i++) {
            sb.append(Integer.toHexString(b[i] & 0xFF));
        }
        return sb.toString();
    }
}

Related

1. getHash(byte[] data)
2. getHash(byte[] data, int offset, int length)
3. getHash(byte[] inputBytes)
4. getHash(byte[]... bytesToHash)
5. getHash(File file)
6. getHash(final byte[] data, final String hashAlgorithm)
7. getHash(final String text, final Charset charset, final MessageDigest algorithm)
8. getHash(InputStream in, String algorithm)
9. getHash(InputStream is, String algorithm)