Java MD5 String md5FromFile(File file)

Description

md From File

License

LGPL

Declaration

static public String md5FromFile(File file) throws IOException 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    static public String md5FromFile(File file) throws IOException {
        if (!file.exists()) {
            return "";
        }//ww  w.ja  v a2s  .c  o  m

        MessageDigest md = null;
        try {
            md = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        byte[] buffer = new byte[8192];

        try (InputStream is = new FileInputStream(file)) {
            DigestInputStream dis = new DigestInputStream(is, md);

            while (dis.read(buffer) != -1)
                ;
        }
        byte[] digest = md.digest();
        StringBuffer sb = new StringBuffer("");
        for (int i = 0; i < digest.length; i++) {
            sb.append(Integer.toString((digest[i] & 0xff) + 0x100, 16).substring(1));
        }

        return sb.toString();
    }

    static public String read(InputStream stream) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
        StringBuilder builder = new StringBuilder();

        String line;

        while ((line = reader.readLine()) != null) {
            builder.append(line);
            builder.append("\n");
        }

        return builder.toString();
    }
}

Related

1. md5Encrypt(String str)
2. md5Encrypt(String str)
3. md5Encryption(String str)
4. md5File(File f)
5. md5file(File file)
6. md5fromFile(String path)
7. md5Hex(String data)
8. md5Hex(String data)
9. md5Hex(String message)