数据库密码加密：

1.maven引入druid jar包

<!-- druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.21</version>
</dependency>

2.打开命令行，进入到druid 的目录，如C:\Users\chgh\.m2\repository\com\alibaba\druid\1.1.21>

 执行指令：java -cp druid-1.1.21.jar com.alibaba.druid.filter.config.ConfigTools 你的密码（示例为123456）：

privateKey:MIIBVgIBADANBgkqhkiG9w0BAQEFAASCAUAwggE8AgEAAkEA0Fu+pHGa4WkEN57Jcgl65FZ+VTRVyK6ElbsC1+VRIy5ihGcSVqN2FS4dI5AQlGRPV0MskQj+n/MoTV0pHKyqawIDAQABAkEAjrXIJioJw0qCsPX5VDpaCfuUHBf0ibe+6C9nCyjuIgFu5+vGaLfpmR7MajoWwlomw9ZBx4QyVmq3foCSIPxxwQIhAOegxR7AOa6YWt9X073FOfd7GPYKwgc9y2IauroUDpNnAiEA5kgskZsTlL9AniY3xzfSvMsSl88bEJlVF2caPZFRMl0CIQCtu4SeoAej0Vq3kqSa/keQPKBoS4Fk9RCLsQjFcS3NmQIhAKQJbZYa/YvL4N/HIZyLq1ZI4em54fGlB/QvwYVx6oERAiAlF2ArHllv+Q5YfqLdgiEpT+eRkkimdvxlpRtjEI2b3w==

publicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBANBbvqRxmuFpBDeeyXIJeuRWflU0VciuhJW7AtflUSMuYoRnElajdhUuHSOQEJRkT1dDLJEI/p/zKE1dKRysqmsCAwEAAQ==

password:e2iMnDbFDfvIYj+QMbV7x0fuyjcTG6cwCtAXzq2DwDOIHo91IqBjnU9qB89FFf9X5AAJqnFaoRWGhe7qhmYucQ==

3.此时获取到公钥publicKey，私钥privateKey，以及密码password，取publicKey及password填入druid的配置中即可

# mysql
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
# 生成的加密后的密码（原密码 123456）
spring.datasource.password=WVMjPhfXQrIsWRo0/RCqAVvYtTU9WNVToKJohb8AlUmHwnV6vwFL+FM2CNFDMJwGHW1iCmyaUlF+sgvFdogqEA==
# 生成的公钥
public-key=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIiwHpFrDijV+GzwRTzWJk8D3j3jFfhsMFJ/7k1NTvBuLgL+TdIHgaMNOIEjHpXzuvX38J3FtOK8hLrySncVGOMCAwEAAQ==
# 配置 connection-properties，启用加密，配置公钥。
spring.datasource.druid.connection-properties=config.decrypt=true;config.decrypt.key=${public-key}
# 启用ConfigFilter
spring.datasource.druid.filter.config.enabled=true

数据库密码解密：

得到加密后的密码，和publicKey，利用druid包里的ConfigTools的decrypt方法解密：

import com.alibaba.druid.filter.config.ConfigTools;

public class DruidUtil {

	public static void main(String[] args) throws Exception {
		String password = "123456";
		System.out.println(ConfigTools.encrypt(password));
	}

}