MD5Util.java

package com.kk.utils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * MD5加密
 * 
 * @author zhihui.kong
 * 
 */
public class MD5Util {
	public static final String LOGIN_USER_TICKET_SALT = "E_bao_Yang_salt";

	// MD5
	private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

	/**
	 * 32位加密
	 * 
	 * @param text
	 * @return
	 */
	public static String md5(String text) {
		MessageDigest msgDigest = null;

		try {
			msgDigest = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			throw new IllegalStateException(
					"System doesn't support MD5 algorithm.");
		}

		try {
			msgDigest.update(text.getBytes("utf-8"));

		} catch (UnsupportedEncodingException e) {

			throw new IllegalStateException(
					"System doesn't support your  EncodingException.");

		}

		byte[] bytes = msgDigest.digest();

		String md5Str = new String(encodeHex(bytes));

		return md5Str;
	}

	public static String generateLoginTicket(String userName, String md5Passwd, String timestamp) {
		return md5(userName + md5Passwd + timestamp + LOGIN_USER_TICKET_SALT);
	}

	private static char[] encodeHex(byte[] data) {

		int l = data.length;

		char[] out = new char[l << 1];

		// two characters form the hex value.
		for (int i = 0, j = 0; i < l; i++) {
			out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
			out[j++] = DIGITS[0x0F & data[i]];
		}

		return out;
	}

	public static void main(String[] args) {
		String s = "wl198665";
		System.out.println(md5(s));
	}
}