AES 对称加密

 package com.skynet.rimp.common.utils.string;

 import java.io.UnsupportedEncodingException;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;

 import javax.crypto.BadPaddingException;
 import javax.crypto.Cipher;
 import javax.crypto.IllegalBlockSizeException;
 import javax.crypto.KeyGenerator;
 import javax.crypto.NoSuchPaddingException;
 import javax.crypto.SecretKey;
 import javax.crypto.spec.SecretKeySpec;

 public class AESUtil {

     private static final String key = "yunyou17lw";

     /**
      * 加密
      * @param content 需要加密的内容
      * @param password  加密密码
      * @return
      */
     private static byte[] encryptByte(String content, String password) {
         try {
             KeyGenerator kgen = KeyGenerator.getInstance("AES");
             kgen.init(128, new SecureRandom(password.getBytes()));
             SecretKey secretKey = kgen.generateKey();
             byte[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Cipher cipher = Cipher.getInstance("AES");// 创建密码器
             byte[] byteContent = content.getBytes("utf-8");
             cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
             byte[] result = cipher.doFinal(byteContent);
             return result; // 加密
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         } catch (NoSuchPaddingException e) {
             e.printStackTrace();
         } catch (InvalidKeyException e) {
             e.printStackTrace();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IllegalBlockSizeException e) {
             e.printStackTrace();
         } catch (BadPaddingException e) {
             e.printStackTrace();
         }
         return null;
     }

     /**
      * 解密
      * @param content  待解密内容
      * @param password 解密密钥
      * @return
      */
     private static byte[] decryptByte(byte[] content, String password) {
         try {
             KeyGenerator kgen = KeyGenerator.getInstance("AES");
             kgen.init(128, new SecureRandom(password.getBytes()));
             SecretKey secretKey = kgen.generateKey();
             byte[] enCodeFormat = secretKey.getEncoded();
             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
             Cipher cipher = Cipher.getInstance("AES");// 创建密码器
             cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
             byte[] result = cipher.doFinal(content);
             return result; // 加密
         } catch (NoSuchAlgorithmException e) {
             e.printStackTrace();
         } catch (NoSuchPaddingException e) {
             e.printStackTrace();
         } catch (InvalidKeyException e) {
             e.printStackTrace();
         } catch (IllegalBlockSizeException e) {
             e.printStackTrace();
         } catch (BadPaddingException e) {
             e.printStackTrace();
         }
         return null;
     }

     /**
      * AES加密
      * @param str
      * @return
      */
     public static String encrypt(String str) {
         return BinaryHex.binary2Hex(encryptByte(str, key));
     }

     /**
      * AES解密
      * @param str
      * @return
      */
     public static String decrypt(String str) throws UnsupportedEncodingException {
         // 16进制转2进制
         byte[] decryptFrom = BinaryHex.hex2Byte(str);
         // 根据byte进行解码
         byte[] decryptResult = decryptByte(decryptFrom, key);
         return new String(decryptResult,"UTF-8");
     }

     public static void main(String[] args) throws UnsupportedEncodingException {
         String str = "发多少房间打扫看来减肥鲁大师 <br>///fdsfds房贷首付斯蒂芬是";
         // 加密
         System.out.println("加密前：" + str);
         String s = AESUtil.encrypt(str);
         System.out.println("加密后：" + s);

         System.out.println("解密后：" + AESUtil.decrypt(s));
     }
 }

 package com.skynet.rimp.common.utils.string;

 /**
  * 2进制/16进制互转
  *
  * @author Jieven
  * @date 2014-5-12
  */
 public class BinaryHex {

     /**
      * 2进制转16进制
      * @param bString 2进制字符串
      * @return
      */
     public static String binary2Hex(String bString) {
         if (bString == null || bString.equals("") || bString.length() % 8 != 0)
             return null;
         StringBuffer tmp = new StringBuffer();
         int iTmp = 0;
         for (int i = 0; i < bString.length(); i += 4) {
             iTmp = 0;
             for (int j = 0; j < 4; j++) {
                 iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1);
             }
             tmp.append(Integer.toHexString(iTmp));
         }
         return tmp.toString();
     }

     /**
      * 16进制转2进制
      * @param hexString
      * @return
      */
     public static String hex2Binary(String hexString) {
         if (hexString == null || hexString.length() % 2 != 0)
             return null;
         String bString = "", tmp;
         for (int i = 0; i < hexString.length(); i++) {
             tmp = "0000" + Integer.toBinaryString(Integer.parseInt(hexString.substring(i, i + 1), 16));
             bString += tmp.substring(tmp.length() - 4);
         }
         return bString;
     }

     /**
      * 将二进制转换成16进制
      * @param buf
      * @return
      */
     public static String binary2Hex(byte buf[]) {
         StringBuffer sb = new StringBuffer();
         for (int i = 0; i < buf.length; i++) {
             String hex = Integer.toHexString(buf[i] & 0xFF);
             if (hex.length() == 1) {
                 hex = '0' + hex;
             }
             sb.append(hex.toUpperCase());
         }
         return sb.toString();
     }

     /**
      * 将16进制转换为二进制
      * @param hexStr
      * @return
      */
     public static byte[] hex2Byte(String hexStr) {
         if (hexStr.length() < 1)
             return null;
         byte[] result = new byte[hexStr.length() / 2];
         for (int i = 0; i < hexStr.length() / 2; i++) {
             int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
             int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
             result[i] = (byte) (high * 16 + low);
         }
         return result;
     }

     public static void main(String[] args) {
         String bString = "1010101111001101";
         System.out.println(binary2Hex(bString));

         String hexString = "ABCD";
         System.out.println(hex2Binary(hexString));
     }
 }

一共两个类，可制作成工具类