JAVA加密解密代码

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class MyDes {

    // 定义 加密算法
    private static final String Algorithm = "DESede";
    private String key = "wjdkseibheyskgvxhtes;gys";
    private byte [] keybyte = key.getBytes();
   
    /***
     * 加密
     * @param keybyte 加密密钥，长度为24字节
     * @param pwd  被加密的数据
     * @return
     */
    private  byte[] encryptMode(byte[] keybyte,String pwd) {  
        byte[] src = pwd.getBytes(); 
        try {  
            // 生成密钥  
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
 
            // 加密  
            Cipher c1 = Cipher.getInstance(Algorithm);  
            c1.init(Cipher.ENCRYPT_MODE, deskey);  
            return c1.doFinal(src);  
        } catch (Exception e1) {  
            e1.printStackTrace();  
        }  
        return null;  
    }  
   
    /***
     * 解密
     * @param keybyte 密钥
     * @param src 加密后的缓冲源
     * @return
     */
    private  byte[] decryptMode(byte[] keybyte,byte[] src) {  
        try {  
            // 生成密钥  
            SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);  
            // 解密  
            Cipher c1 = Cipher.getInstance(Algorithm);  
            c1.init(Cipher.DECRYPT_MODE, deskey);  
            return c1.doFinal(src);  
        } catch (Exception e1) {             
        } 
        return null;  
    }
   
    // 转换成十六进制字符串  
    private String byte2hex(byte[] b) {  
        String hs = "";  
        String stmp = "";  
 
        for (int n = 0; n < b.length; n++) {  
              
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));  
          
            if (stmp.length() == 1)  
                hs = hs + "0" + stmp;  
            else 
                hs = hs + stmp;  
            if (n < b.length - 1)  
                hs = hs + "";  
        }  
        return hs.toUpperCase();  
    }
   
    /***
     * 返回加密后的字符串
     * @param pwd
     * @return
     */
    public String encrypt(String pwd){       
        return new String(this.encryptMode(keybyte, pwd));
    }
   
    /***
     * 根据密码生成cookie中保存的字符串
     * @param pwd
     * @return
     */
    public String getCoookieString(String pwd){
        byte[] encoded = this.encryptMode(keybyte, pwd);   
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < encoded.length; i++) {
            sb.append(encoded[i]);
            if(i!=(encoded.length-1)){
                sb.append("&");
            }
        }
        return sb.toString();
    }
   
    /***
     * 把cookie中的字符串变成解密用的byte[]数组
     * @param cookieString
     * @return
     */
    private byte[] getCookieByte(String cookieString){
        String [] s = cookieString.split("&");
        byte[] en = new byte[s.length] ;
        for (int i = 0; i < s.length; i++) {
            en[i] = Byte.parseByte(s[i]);
        }
        return en;
    }
   
    public String decrypt(String pwds){
        byte[] en = this.getCookieByte(pwds);
        return new String(this.decryptMode(keybyte, en));
    }
}