1 pom依赖

<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
</dependency>

2 写个工具类，用于生成公钥私钥，对数据进行加密解密等

import com.alibaba.druid.filter.config.ConfigTools;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

public class DruidEncryptUtil {

    private static String publicKey;

    private static String privateKey;

    static {
        try {
            String[] keyPair = ConfigTools.genKeyPair(512);
            privateKey = keyPair[0];
            System.out.println("私钥:" + privateKey);
            System.out.println();
            publicKey = keyPair[1];
            System.out.println("公钥:" + publicKey);
            System.out.println();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }
    }

    public static String encrypt(String plainText) throws Exception {
        String encrypt = ConfigTools.encrypt(privateKey, plainText);
        return encrypt;
    }

    public static String decrypt(String encryptText) throws Exception {
        String decrypt = ConfigTools.decrypt(publicKey, encryptText);
        return decrypt;
    }

    public static void main(String[] args) throws Exception {
        String encrypt = encrypt("123456");
        System.out.println("原文数据加密后:" + encrypt);

        System.out.println();

        String decrypt = decrypt(encrypt);
        System.out.println("解密后的原文:" + decrypt);
    }

}

3 修改yml文件，先用上面的工具类，把需要的数据加密，并复制公钥到yml中，关注注释：改动

spring:
  application:
    name: demo-shop

  datasource:
    url: jdbc:mysql://localhost:3306/mydb-1?useUnicode=true&characterEncoding=utf-8
    username: root
    # 改动1
    password: byOoGNulf855VLIb5RoFJHGF2ICpNMBXqmUDKMOXr8AZSqgVALhAo9SPdNjaSAFLKq0XIRGOtDkt9B48H2t1FQ==
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    druid:
      # 改动2
      connectionProperties: config.decrypt=true;config.decrypt.key=${publicKey};
      # 改动3,启用ConfigFilter
      filter:
        config:
          enabled: true

# 改动4
publicKey: MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJCA44FIppHTdSwaxY5NYWJDpTbXhBK1fWIsRTzWgQuJO4O5HKvyJpWwHP9luMf4b2WeGDuvtWuC1+FxVY94tNECAwEAAQ==