newfilemd5.java

这是一个获取文件MD5码的JAVA程序。可以用于学习JAVA

package com.md5.chen;

import java.security.*;
import java.io.*;



//计算一个文件输入流的MD5
public class NewFileMD5
{
	

	public static void main(String[] args)
	{
		String PATH = null;
		String result = "";

		BufferedReader reader = new BufferedReader(new InputStreamReader(
				System.in));
		System.out.println("输入文件路径:");
		try
		{
			PATH = reader.readLine();// 将主目录路径保存再PATH中

		} catch (IOException e)
		{
			e.toString();
		}

		try
		{ // 生成MessageDigest对象MD
			MessageDigest m = MessageDigest.getInstance("MD5");
			FileInputStream fin = new FileInputStream(PATH);
			DigestInputStream din = new DigestInputStream(fin, m);

			while (din.read() != -1)
			{
				;
			}
			// 计算MD5
			byte s[] = m.digest();
			for (int i = 0; i < s.length; i++)
			{
				result += Integer.toHexString((0x000000ff & s[i]) | 0xffffff00)
						.substring(6);
			}
		} catch (Exception e)
		{
			e.toString();
		}
		System.out.println("MD5:" + result);

	}
}