MD5加密算法

package com.aes;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * MD5加密算法 */public class Md5Encrypt {/** * Used building output as Hex */private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6','7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };/** * 对字符串进行MD5加密 *  * @param text *            明文 *  * @return 密文 */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 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;}}