配置文件中保存明文密码显得不那么安全，这里解决这个问题。配置文件中保存加密后的密文，在使用的时候再解密还原。

java.util.Base64是Java 1.8新增的，如果jdk版本低于1.8，请更换成其他的Base64工具。

import java.io.UnsupportedEncodingException;  import java.security.InvalidKeyException;  import java.security.NoSuchAlgorithmException;  import java.security.SecureRandom;  import java.util.Base64;  import javax.crypto.BadPaddingException;  import javax.crypto.Cipher;  import javax.crypto.IllegalBlockSizeException;  import javax.crypto.KeyGenerator;  import javax.crypto.NoSuchPaddingException;  import javax.crypto.spec.SecretKeySpec;  public class EncryptUtils {  	/**  	 * AES加密  	 *   	 * [@param](https://my.oschina.net/u/2303379) ciphertext  	 *            待加密的内容  	 * [@param](https://my.oschina.net/u/2303379) encryptKey  	 *            加密密钥  	 * [@return](https://my.oschina.net/u/556800) 加密后的byte[]  	 */  	public static byte[] aesEncryptToBytes(String ciphertext, String encryptKey) {  		try {  			return getCipher(Cipher.ENCRYPT_MODE, encryptKey).doFinal(  					ciphertext.getBytes("utf-8"));  		} catch (IllegalBlockSizeException e) {  			e.printStackTrace();  			return null;  		} catch (BadPaddingException e) {  			e.printStackTrace();  			return null;  		} catch (UnsupportedEncodingException e) {  			e.printStackTrace();  			return null;  		} catch (NoSuchAlgorithmException e) {  			e.printStackTrace();  			return null;  		}  	}  	/**  	 * AES解密  	 *   	 * [@param](https://my.oschina.net/u/2303379) encryptBytes  	 *            待解密的byte[]  	 * [@param](https://my.oschina.net/u/2303379) decryptKey  	 *            解密密钥  	 * @return 解密后的String  	 */  	public static String aesDecryptByBytes(byte[] encryptBytes,  			String decryptKey) {  		byte[] decryptBytes;  		try {  			decryptBytes = getCipher(Cipher.DECRYPT_MODE, decryptKey).doFinal(  					encryptBytes);  		} catch (IllegalBlockSizeException e) {  			e.printStackTrace();  			return null;  		} catch (BadPaddingException e) {  			e.printStackTrace();  			return null;  		} catch (NoSuchAlgorithmException e) {  			e.printStackTrace();  			return null;  		}  		return new String(decryptBytes);  	}  	private static Cipher getCipher(int cipherMode, String encryptKey) throws NoSuchAlgorithmException {  		KeyGenerator kgen;  		SecureRandom random = SecureRandom.getInstance("SHA1PRNG");  		random.setSeed(encryptKey.getBytes());  		try {  			kgen = KeyGenerator.getInstance("AES");  		} catch (NoSuchAlgorithmException e) {  			e.printStackTrace();  			return null;  		}  		kgen.init(128, random);  		Cipher cipher;  		try {  			cipher = Cipher.getInstance("AES");  		} catch (NoSuchAlgorithmException e) {  			e.printStackTrace();  			return null;  		} catch (NoSuchPaddingException e) {  			e.printStackTrace();  			return null;  		}  		try {  			cipher.init(cipherMode, new SecretKeySpec(kgen.generateKey()  					.getEncoded(), "AES"));  		} catch (InvalidKeyException e) {  			e.printStackTrace();  			return null;  		}  		return cipher;  	}  	/**  	 * 根据传入的内容和密钥，返回加密后得到的base64字符串  	 *   	 * @author ChangJian  	 * @data 2018年7月25日  	 * @param ciphertext  	 *            待加密的内容  	 * @param encryptKey  	 *            密钥  	 * @return  	 */  	public static String encryptAesBase64(String ciphertext, String encryptKey) {  		return Base64.getEncoder().encodeToString(aesEncryptToBytes(ciphertext, encryptKey));  	}  	/**  	 * 把encryptAesBase64方法生成的base64形式的密码还原成明文密码  	 *   	 * @author ChangJian  	 * @data 2018年7月25日  	 * @param ciphertext  	 *            base64形式的密码  	 * @param decryptKey  	 *            解密的密钥  	 * @return  	 */  	public static String decryptAesBase64(String ciphertext, String decryptKey) {  		return aesDecryptByBytes(Base64.getDecoder().decode(ciphertext), decryptKey);  	}  	/**  	 * 测试  	 */  	public static void main(String[] args) {  		String password = "password123456";  		String decryptKey = "8F85C42859C4B883817EB72E37AF2A3E";  		String ciphertext = encryptAesBase64(password, decryptKey);  		System.out.println("密文：" + ciphertext);  		System.out.println("解密：" + decryptAesBase64(ciphertext, decryptKey));  	}  }