本文共 2725 字，大约阅读时间需要 9 分钟。

依赖包

import org.apache.commons.codec.digest.DigestUtils;import org.apache.commons.codec.binary.Base64;

算法代码

/**     * 转换成十六进制字符串     * @param username     * @return     *     * lee on 2017-08-09 10:54:19     */    public static byte[] hex(String key){          String f = DigestUtils.md5Hex(key);          byte[] bkeys = new String(f).getBytes();          byte[] enk = new byte[24];          for (int i=0;i<24;i++){              enk[i] = bkeys[i];          }          return enk;      }        /**     * 3DES加密     * @param key 密钥，24位     * @param srcStr 将加密的字符串     * @return     *     * lee on 2017-08-09 10:51:44     */    public static String  encode3Des(String key,String srcStr){      	byte[] keybyte = hex(key);    	byte[] src = srcStr.getBytes();        try {             //生成密钥             SecretKey deskey = new SecretKeySpec(keybyte, "DESede");           //加密             Cipher c1 = Cipher.getInstance("DESede");           c1.init(Cipher.ENCRYPT_MODE, deskey);                        String pwd = Base64.encodeBase64String(c1.doFinal(src));//           return c1.doFinal(src);//在单一方面的加密或解密             return pwd;       } catch (java.security.NoSuchAlgorithmException e1) {             // TODO: handle exception              e1.printStackTrace();         }catch(javax.crypto.NoSuchPaddingException e2){             e2.printStackTrace();         }catch(java.lang.Exception e3){             e3.printStackTrace();         }         return null;     }       /**    * 3DES解密    * @param key 加密密钥，长度为24字节      * @param desStr 解密后的字符串    * @return    *    * lee on 2017-08-09 10:52:54    */     public static String decode3Des(String key, String desStr){      	Base64 base64 = new Base64();    	byte[] keybyte = hex(key);    	byte[] src = base64.decode(desStr);    			        try {              //生成密钥              SecretKey deskey = new SecretKeySpec(keybyte, "DESede");              //解密              Cipher c1 = Cipher.getInstance("DESede");              c1.init(Cipher.DECRYPT_MODE, deskey);              String pwd = new String(c1.doFinal(src));//            return c1.doFinal(src);              return pwd;        } catch (java.security.NoSuchAlgorithmException e1) {              // TODO: handle exception              e1.printStackTrace();          }catch(javax.crypto.NoSuchPaddingException e2){              e2.printStackTrace();          }catch(java.lang.Exception e3){              e3.printStackTrace();          }          return null;              }

String key = "xUHdKxzVCbsgVIwTnc1jtpWn";		String idcard = "130682199606071234";		String encode = PasswordUtil.encode3Des(key, idcard);		log.info("原串：" + idcard);		log.info("加密后的串：" + encode);		log.info("解密后的串：" + PasswordUtil.decode3Des(key, encode));

输出