springboot 使用druid 配置数据库密码加密
1.添加DruidConfig配置类

package org.jeecg.config;

import com.alibaba.druid.filter.config.ConfigTools;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.sql.SQLException;


/**
 * Druid配置类
 * 1、可以监控数据库访问性能，内置了插件：StatFilter，能够详细统计SQL执行性能，用于线上分析数据库访问性能。
 * 2、替换DBCP、C3P0数据库连接池，提供了一个高效稳定的扩展性能好的数据库连接池DruidDataSource。
 * 3、数据库加密，DruidDriuiver和DruidDataSource都支持PasswordCallback。
 * 4、SQL执行日志。
 * 5、扩展JDBC，如果你要对JDBC层有编程的需求，可以通过Druid提供的Filter-Chain机制，很方便编写JDBC层的扩展插件
 * Druid是一个阿里开源的数据库连接池框架，有可视化界面。
 * http://localhost:8080/druid/login.html
 * 可以查看sql访问速度等等很多信息，感觉还是比较有用的。集成进来试试
 * @author maybe
 */
@Configuration
@Slf4j
public class DruidConfig {

    //使用@value注入配置文件中信息
    @Value("${spring.datasource.dynamic.datasource.master.url}")
    private String dbUrl;

    @Value("${spring.datasource.dynamic.datasource.master.username}")
    private String username;

    @Value("${spring.datasource.dynamic.datasource.master.password}")
    private String password;

    @Value("${spring.datasource.dynamic.datasource.master.public-key}")
    private String publicKey;

    @Value("${spring.datasource.dynamic.datasource.master.driver-class-name}")
    private String driverClassName;

    @Value("${spring.datasource.dynamic.druid.initial-size}")
    private int initialSize;

    @Value("${spring.datasource.dynamic.druid.min-idle}")
    private int minIdle;

    @Value("${spring.datasource.dynamic.druid.max-active}")
    private int maxActive;

    @Value("${spring.datasource.dynamic.druid.max-wait}")
    private int maxWait;

    @Value("${spring.datasource.dynamic.druid.timeBetweenEvictionRunsMillis}")
    private int timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.dynamic.druid.minEvictableIdleTimeMillis}")
    private int minEvictableIdleTimeMillis;

    @Value("${spring.datasource.dynamic.druid.validationQuery}")
    private String validationQuery;

    @Value("${spring.datasource.dynamic.druid.testWhileIdle}")
    private boolean testWhileIdle;

    @Value("${spring.datasource.dynamic.druid.testOnBorrow}")
    private boolean testOnBorrow;

    @Value("${spring.datasource.dynamic.druid.testOnReturn}")
    private boolean testOnReturn;

    @Value("${spring.datasource.dynamic.druid.filters}")
    private String filters;

    @Value("${spring.datasource.dynamic.druid.logSlowSql}")
    private String logSlowSql;

    @Value("${spring.datasource.dynamic.druid.connectionProperties}")
    private String connectionProperties;

    @Bean
    public ServletRegistrationBean druidServlet() throws Exception {
        ServletRegistrationBean reg = new ServletRegistrationBean();
        reg.setServlet(new StatViewServlet());
        reg.addUrlMappings("/druid/*");//配置访问URL
        reg.addInitParameter("loginUsername", username);  //配置用户名，这里使用数据库账号。
        reg.addInitParameter("loginPassword", ConfigTools.decrypt(publicKey,password));  //配置用户名，这里使用数据库密码
        reg.addInitParameter("logSlowSql", logSlowSql);   //是否启用慢sql
        return reg;
    }

    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");  //配置那些资源不被拦截
        filterRegistrationBean.addInitParameter("profileEnable", "true");
        return filterRegistrationBean;
    }

    /**
     * 这个应该是数据库连接池配置
     * @return
     * @throws Exception
     */
    @Bean
    public DataSource druidDataSource() throws Exception {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(ConfigTools.decrypt(publicKey,password));
        datasource.setDriverClassName(driverClassName);
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setConnectionProperties(connectionProperties);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            log.error("druid configuration initialization filter:{}",e);
        }
        return datasource;
    }

}

2.给配置文件中配置数据库

spring
 datasource:
    druid:
      stat-view-servlet:
        enabled: true
        loginUsername: admin
        loginPassword: 123456
        allow:
      web-stat-filter:
        enabled: true
    dynamic:
      druid: # 全局druid参数，绝大部分值和默认保持一致。(现已支持的参数如下,不清楚含义不要乱设置)
        # 连接池的配置信息
        # 初始化大小，最小，最大
        initial-size: 5
        min-idle: 5
        maxActive: 20
        # 配置获取连接等待超时的时间
        maxWait: 60000
        # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
        timeBetweenEvictionRunsMillis: 60000
        # 配置一个连接在池中最小生存的时间，单位是毫秒
        minEvictableIdleTimeMillis: 300000
        validationQuery: SELECT 1 FROM DUAL
        testWhileIdle: true
        testOnBorrow: false
        testOnReturn: false
        logSlowSql: true
        # 打开PSCache，并且指定每个连接上PSCache的大小
        poolPreparedStatements: true
        maxPoolPreparedStatementPerConnectionSize: 20
        # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
        filters: stat,wall,slf4j,config
        # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
        connectionProperties: druid.stat.mergeSql\=true;druid.stat.slowSqlMillis\=5000
      datasource:
        master:
          url: jdbc:mysql://127.0.0.1:3306/jeecg_boot?characterEncoding=UTF-8&useUnicode=true&useSSL=false
          username: root
          password: U9FSu3rAgada8zV0VGTVEeAKc3Ccxgzbz9nuC4AWKzrxdZIJLvdnCjy9D913jI5sHxlzK6HfdR5+cEbPhM8v9A==
          public-key: MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALR6ubZQXlaJQIVTxgqxKMdhKjhwTcsQDQq8Rvxa0G/gnZHCMxSZMtiWD8p7L4pHYWys99sOzfIBiP14LZkzNMUCAwEAAQ==

          driver-class-name: com.mysql.jdbc.Driver
          # 多数据源配置
          #multi-datasource1:
          #url: jdbc:mysql://localhost:3306/jeecg-boot2?useUnicode=true&characterEncoding=utf8&autoReconnect=true&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true
          #username: root
          #password: root
          #driver-class-name: com.mysql.jdbc.Driver

那么现在spring boot集成druid已经完成了。只差将密码加密并且写入配置文件即可。

druid进行数据库密码加密：
1，找到druid的相关jar包
这里我是用的是

2，进行加密
进行cmd找到该jar包所在目录，执行：

java -cp druid-1.1.17.jar com.alibaba.druid.filter.config.ConfigTools your-password
得到：

privateKey:MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEAtHq5tlBeVolAhVPGCrEox
2EqOHBNyxANCrxG/FrQb+CdkcIzFJky2JYPynsvikdhbKz32w7N8gGI/XgtmTM0xQIDAQABAkAhnF1rm
4oGGad/bPuL0DRk9S50tk12jLWxEyExLAR3YRAYZTDREv4XIM4paB1Q3NLgOnYXWBpr5/SwfFMq4BqdA
iEA5gd7XORlZDq19nWyW05hTyqrsct/oVCXf6wi2GVB5HsCIQDI2xu/4uR55WcBDwQMHKSdId07XhtK1
ZeU5asWAEEnvwIgbUN8i6FJsBRbPpilgc13V31zVN7O3zdC3zhKzPM8G2UCIQCj+waHvXSs9BYJLjour
T/TrW8R5f3ANetgO7VW6/RFvwIhAIfRioDqbwOLI9c4ppneBIDw6Hk6lzLonX3eU9EGBznx


publicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALR6ubZQXlaJQIVTxgqxKMdhKjhwTcsQDQq8Rv
xa0G/gnZHCMxSZMtiWD8p7L4pHYWys99sOzfIBiP14LZkzNMUCAwEAAQ==


password:U9FSu3rAgada8zV0VGTVEeAKc3Ccxgzbz9nuC4AWKzrxdZIJLvdnCjy9D913jI5sHxlzK6H
fdR5+cEbPhM8v9A==

1，privateKey  私钥，进行加密时的key

2，publickey  公钥，进行解密时的key

3，password  加密后的密码 

将password和publickey填入配置文件中即可完成。