java字符串-用户名和密码-加密解密

java字符串加密解密

try {
                String test = "123456789@fdj.com";
                EncryptionDecryption des = new EncryptionDecryption("tourhb");// 自定义密钥
                System.out.println("加密前的字符：" + test);
                System.out.println("加密后的字符：" + des.encrypt(test));
                System.out.println("解密后的字符：" + des.decrypt(des.encrypt(test)));

                System.out.println("解密后的字符："
                        + des.decrypt("fe14c7c41f7d2a94b07d7928b21346e7"));

            } catch (Exception e) {
                e.printStackTrace();
            }

下面是加密解密类的源码

import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;

public class EncryptionDecryption {

    private static String strDefaultKey = "tourhb";

    /** 加密工具 */
    private Cipher encryptCipher = null;

    /** 解密工具 */
    private Cipher decryptCipher = null;

    /**
     * 将byte数组转换为表示16进制值的字符串， 如：byte[]{8,18}转换为：0813， 和public static byte[]
     * hexStr2ByteArr(String strIn) 互为可逆的转换过程
     *
     * @param arrB
     *            需要转换的byte数组
     * @return 转换后的字符串
     * @throws Exception
     *  
     */
    public static String byteArr2HexStr(byte[] arrB) throws Exception {
        int iLen = arrB.length;
        // 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
        StringBuffer sb = new StringBuffer(iLen * 2);
        for (int i = 0; i < iLen; i++) {
            int intTmp = arrB[i];
            // 把负数转换为正数
            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();