java中加密和好密之一

java中加密和解密之一
package com.xgw.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.security.Key;
import javax.crypto.Cipher;
public class EncryptMain
{
    private static String defaultKeyStr = "huawei.esb.key";   
    public static String encryptDES(String info)
    {
        // 定义加密算法，可用，DES，DESede,Blowfish
        String Algorithm = "DES";
        // 定义加密key
        Key key = getKey();
        // 定义要生成的密文
        String rs = "";
        byte[] cipherByte = null;
        try
        {
            // 得到加密/解密器
            Cipher cl = Cipher.getInstance(Algorithm);
            // 用指定的密钥和模式初始化Cipher对象
            // 参数:(ENCRYPT_MODE, DECRYPT_MODE, WRAP_MODE,UNWRAP_MODE)
            cl.init(Cipher.ENCRYPT_MODE, key);
            // 对要加密的内容进行编码处理。
            cipherByte = cl.doFinal(info.getBytes());
            rs = byte2hex(cipherByte);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        // 返回密文的16进制形式
        return rs;
    }
    private static String byte2hex(byte[] arrB)
    {
        int iLen = arrB.length;
        // 每个byte用两个字符才能表示，所以字符串长度是数据长度的2倍
        StringBuffer sb = new StringBuffer(iLen * 2);
        for (int i = 0; i < iLen; i++)
        {
            int intTmp = arrB[i];
            // 把负数转换成正数
            while (intTmp < 0)
            {
                intTmp = intTmp + 256;
            }
            // 小于0F的数需要在前面补0
            if (intTmp < 16)
            {
                sb.append("0");
            }
            sb.append(Integer.toString(intTmp, 16));
        }
        return sb.toString();
    }
    public static Key getKey()
    {
        byte[] arrBTmp = defaultKeyStr.getBytes();
        // 创建一个空的8位字节数组（默认值为0）
        byte[] arrB = new byte[8];
        // 将原始字节数组转换为8位
        for (int i = 0; i < arrBTmp.length && i < arrB.length; i++)
        {
            arrB[i] = arrBTmp[i];
        }
        // 生成密
        Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
        return key;
    }
    public static void main(String[] args)
    {
        System.out.println("Program running...");
        boolean b_mark = true;
        while (b_mark)
        {
            try
            {
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        System.in));
                String source = br.readLine();
                if ("exit".equals(source))
                {
                    System.out.println("Program Exit.");
                    b_mark = false;
                }
                else
                {                 
                    String target = EncryptMain.encryptDES(source);
                    System.out.println(target);
                }              
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    }
}