md5 加密工具類

安全加密方式 MD5 ,關鍵詞 不可逆  彩虹表 加鹽

package test.test.util;

import java.security.MessageDigest;

public class Md5Util {

	    /*
	     * public static int getLocation(String[] fields, String field) { if (fields ==
	     * null || fields.length == 0) { return -1; } for (int i = 0; i <
	     * fields.length; i++) { //System.out.println(fields[i]); if
	     * (fields[i].indexOf(field) != -1) { //System.out.println("i:" + i); return
	     * i; } } return -1; }
	     */

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

	    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];
	    }

	    /**
	     * MD5Encode
	     * @param origin
	     * @return MD5 code
	     */
	    public static String MD5Encode(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;
	    }


}