get File Name MD5 - Java Security

Java examples for Security:MD5

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Description

get File Name MD5

Demo Code


//package com.java2s;
import java.io.File;
import java.io.FileInputStream;
import java.math.BigInteger;
import java.security.MessageDigest;

public class Main {
    public static String getFileNameMD5(String filename) {
        File file = new File(filename);
        if (!file.isFile()) {
            return "";
        }// w ww.  j  a  va  2  s .  c om
        MessageDigest digest = null;
        FileInputStream in = null;
        byte buffer[] = new byte[1024];
        int len;
        try {
            digest = MessageDigest.getInstance("MD5");
            in = new FileInputStream(file);
            while ((len = in.read(buffer, 0, 1024)) != -1) {
                digest.update(buffer, 0, len);
            }
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BigInteger bigInt = new BigInteger(1, digest.digest());
        return bigInt.toString(16);
    }
}

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