securitytools.java

一个用struts tiles的在线影院web系统

package com.eline.vod.utils;

import java.security.MessageDigest;


public class SecurityTools {

    public SecurityTools() {
    }

    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;
    }

    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 static void main(String args[]) {
        String password = "hello";
        String hashCode = MD5Encode(password);
        System.out.println(hashCode);
    }

    private static final String hexDigits[] = {
        "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", 
        "A", "B", "C", "D", "E", "F"
    };
}