SpringBoot 2.x 从yml文件中读取配置自动解密，同时附上DESUtil

在SpringBoot 2.x 中，我们通过yml文件来进行各种配置，之前我们需要通过编写一个DESUtil来对获取的配置进行解密，但是通过下面的方式可以直接对配置文件进行自动解密

@Configuration
public class EncryptionPropertyConfig {

    @Bean(name="encryptablePropertyResolver")
    public EncryptablePropertyResolver encryptablePropertyResolver() {
        return new EncryptionPropertyResolver();
    }

    class EncryptionPropertyResolver implements EncryptablePropertyResolver {

        private static final String DES = "DES@";

        @Override
        public String resolvePropertyValue(String value) {
            if(StringUtils.isBlank(value)) {
                return value;
            }
            // 返回明文
            if(value.startsWith(DES)) {
                return resolveDESValue(value.substring(DES.length()));
            }
            return value;
        }

        private String resolveDESValue(String value) {
            return DESUtil.getDecryptString(value);
        }

    }
}

这样，我们只需要在yml文件中加上DES@为前缀，就可以进行自动解密，省去了手动在代码中进行解密的操作了。

同时附上正常的DESUtil的制作方式

public class DESUtil
{
    private static Key key;
    private static String KEY_STR="**************";

    private static final Logger log = LoggerFactory.getLogger(DESUtil.class);

    static{
        try {
            KeyGenerator generator = KeyGenerator.getInstance("DES");
            SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(KEY_STR.getBytes());
            generator.init(secureRandom);
            key = generator.generateKey();
            generator=null;
        } catch (Exception e) {
            log.error(e.getMessage(),e);
            throw new RuntimeException(e);
        }
    }

    /**
     * 对字符串进行加密，返回BASE64的加密字符串
     * <功能详细描述>
     * @param str
     * @return
     * @see [类、类#方法、类#成员]
     */
    public static String getEncryptString(String str){
        Base64 base64Encoder = new Base64();
        try {
            byte[] strBytes = str.getBytes("UTF-8");
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return base64Encoder.encodeToString(encryptStrBytes);
        } catch (Exception e) {
            log.error(e.getMessage(),e);
            throw new RuntimeException(e);
        }

    }

    /**
     * 对BASE64加密字符串进行解密
     * <功能详细描述>
     * @param str
     * @return
     * @see [类、类#方法、类#成员]
     */
    public static String getDecryptString(String encryptStr){
        if(encryptStr==null) {
            return null;
        }
        Base64 base64Encoder = new Base64();
        try {
            byte[] strBytes = base64Encoder.decode(encryptStr);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return new String(encryptStrBytes,"UTF-8");
        } catch (Exception e) {
            log.error(e.getMessage(),e);
            throw new RuntimeException(e);
        }

    }

    public static String getEncryptString(String str, String keyStr){
        Base64 base64Encoder = new Base64();
        try {
            Key key = getKey(keyStr);
            byte[] strBytes = str.getBytes("UTF-8");
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return base64Encoder.encodeToString(encryptStrBytes);
        } catch (Exception e) {
            log.error(e.getMessage(),e);
            throw new RuntimeException(e);
        }

    }

    public static String getDecryptString(String encryptStr,String keyStr){
        if(encryptStr==null) {
            return null;
        }
        Base64 base64Encoder = new Base64();
        try {
            Key key = getKey(keyStr);
            byte[] strBytes = base64Encoder.decode(encryptStr);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return new String(encryptStrBytes,"UTF-8");
        } catch (Exception e) {
            log.error(e.getMessage(),e);
            throw new RuntimeException(e);
        }

    }

    private static Key getKey(String keyStr) throws NoSuchAlgorithmException{
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");
        secureRandom.setSeed(keyStr.getBytes());
        generator.init(secureRandom);
        return generator.generateKey();
    }

}