Java 的 Hash 工具类（MD5 SHA1）

HashUtils.java

package com.terrynow.common;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Developer: Terry DateTime : 2007-12-18 下午03:36:22
 */

public class HashUtils {
	
	public static String md5(String str){
		return compute(str, "MD5");
	}
	
	public static String sha1(String str){
		return compute(str, "SHA-1");
	}
	
	private static String compute(String inStr, String hash) {
		String result = null;
		try {
			byte[] valueByte = inStr.getBytes();
			MessageDigest md = MessageDigest.getInstance(hash);
			md.update(valueByte);
			result = toHex(md.digest());
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return result;
	}

	// 将传递进来的字节数组转换成十六进制的字符串形式并返回
	private static String toHex(byte[] buffer) {
		StringBuffer sb = new StringBuffer(buffer.length * 2);
		for (int i = 0; i < buffer.length; i++) {
			sb.append(Character.forDigit((buffer[i] & 0xf0) >> 4, 16));
			sb.append(Character.forDigit(buffer[i] & 0x0f, 16));
		}
		return sb.toString();

	}
	
	public static void main(String[] args){
		System.out.println(md5("123456"));
		System.out.println(sha1("123456"));
	}
	
}