md5.java

Java项目开发实用案例之公司办公信息管理系统 本系统为公司办公信息管理系统EIMS

package cn.edu.buaa.nlsde.md5;

import java.security.MessageDigest;

public class MD5 {

	public MD5() {
	}
	
	private final static String[] hexDigits = { 
		  "0", "1", "2", "3", "4", "5", "6", "7", 
		  "8", "9", "a", "b", "c", "d", "e", "f"};

	/** 
	 * 转换字节数组为16进制字串 
	 * @param b 字节数组 
	 * @return 16进制字串 
	 */

	public static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n = 256 + n;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public String getMD5ofStr(String origin) {
		String resultString = null;

		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString =
				byteArrayToHexString(
					md.digest(resultString.getBytes()));
		}
		catch (Exception ex) {

		}
		return resultString;
	}

	public static void main(String[] args) {
		System.err.println(new MD5().getMD5ofStr("euyi"));
	}
}