content: package me.flyray.common.security;
  
  import java.security.InvalidKeyException;
  import java.security.Key;
  import java.security.NoSuchAlgorithmException;
  import java.security.SecureRandom;
  import java.security.spec.InvalidKeySpecException;
  
  import javax.crypto.Cipher;
  import javax.crypto.SecretKey;
  import javax.crypto.SecretKeyFactory;
  import javax.crypto.spec.DESKeySpec;
  
  import org.apache.commons.codec.binary.Base64;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  public class DESUtil {
      private final static Logger logger = LoggerFactory.getLogger(DESUtil.class);
      //算法名称 
      public static final String KEY_ALGORITHM = "DES";
      //算法名称/加密模式/填充方式 
      //DES共有四种工作模式-->>ECB：电子密码本模式、CBC：加密分组链接模式、CFB：加密反馈模式、OFB：输出反馈模式
      public static final String CIPHER_ALGORITHM = "DES/ECB/NoPadding";
  
      /**
       *   
       * 生成密钥key对象
       * @param KeyStr 密钥字符串 
       * @return 密钥对象 
       * @throws InvalidKeyException   
       * @throws NoSuchAlgorithmException   
       * @throws InvalidKeySpecException   
       * @throws Exception 
       */
      private static SecretKey keyGenerator(String keyStr) throws Exception {
          byte input[] = HexString2Bytes(keyStr);
          DESKeySpec desKey = new DESKeySpec(input);
          //创建一个密匙工厂，然后用它把DESKeySpec转换成
          SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
          SecretKey securekey = keyFactory.generateSecret(desKey);
          return securekey;
      }
  
      private static int parse(char c) {
          if (c >= 'a') return (c - 'a' + 10) & 0x0f;
          if (c >= 'A') return (c - 'A' + 10) & 0x0f;
          return (c - '0') & 0x0f;
      }
  
      // 从十六进制字符串到字节数组转换 
      public static byte[] HexString2Bytes(String hexstr) {
          byte[] b = new byte[hexstr.length() / 2];
          int j = 0;
          for (int i = 0; i < b.length; i++) {
              char c0 = hexstr.charAt(j++);
              char c1 = hexstr.charAt(j++);
              b[i] = (byte) ((parse(c0) << 4) | parse(c1));
          }
          return b;
      }
  
      /** 
       * 加密数据
       * @param data 待加密数据
       * @param key 密钥
       * @return 加密后的数据 
       */
      public static String encrypt(String data, String key) throws Exception {
          Key deskey = keyGenerator(key);
          // 实例化Cipher对象，它用于完成实际的加密操作
          Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
          SecureRandom random = new SecureRandom();
          // 初始化Cipher对象，设置为加密模式
          cipher.init(Cipher.ENCRYPT_MODE, deskey, random);
          byte[] results = cipher.doFinal(data.getBytes());
          // 该部分是为了与加解密在线测试网站（http://tripledes.online-domain-tools.com/）的十六进制结果进行核对
          for (int i = 0; i < results.length; i++) {
              System.out.print(results[i] + " ");
          }
          System.out.println();
          // 执行加密操作。加密后的结果通常都会用Base64编码进行传输 
          return Base64.encodeBase64String(results);
      }
  
      /** 
       * 解密数据 
       * @param data 待解密数据 
       * @param key 密钥 
       * @return 解密后的数据 
       */
      public static String decrypt(String data, String key) throws Exception {
          Key deskey = keyGenerator(key);
          Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
          //初始化Cipher对象，设置为解密模式
          cipher.init(Cipher.DECRYPT_MODE, deskey);
          // 执行解密操作
          return new String(cipher.doFinal(Base64.decodeBase64(data)));
      }
  
      public static void main(String[] args) throws Exception {
          String source = "amigoxie";
          System.out.println("原文: " + source);
          String key = "A1B2C3D4E5F60708";
          String encryptData = encrypt(source, key);
          System.out.println("加密后: " + encryptData);
          String decryptData = decrypt(encryptData, key);
          System.out.println("解密后: " + decryptData);
      }
  }