<dependency> 
      <groupId>mysql</groupId> 
      <artifactId>mysql-connector-java</artifactId> 
      <scope>runtime</scope> 
    </dependency> 

<dependency> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-starter-data-jpa</artifactId> 
    </dependency> 

<dependency> 
      <groupId>com.alibaba</groupId> 
      <artifactId>druid</artifactId> 
      <version>1.0.25</version> 
    </dependency> 

# 驱动配置信息 
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource 
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/mealsystem?useUnicode=true&characterEncoding=utf-8 
spring.datasource.username = root 
spring.datasource.password = 123456 
spring.datasource.driverClassName = com.mysql.jdbc.Driver 
  
#连接池的配置信息 
spring.datasource.initialSize=5 
spring.datasource.minIdle=5 
spring.datasource.maxActive=20 
spring.datasource.maxWait=60000 
spring.datasource.timeBetweenEvictionRunsMillis=60000 
spring.datasource.minEvictableIdleTimeMillis=300000 
spring.datasource.validationQuery=SELECT 1 FROM DUAL 
spring.datasource.testWhileIdle=true 
spring.datasource.testOnBorrow=false 
spring.datasource.testOnReturn=false 
spring.datasource.poolPreparedStatements=true 
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20 
spring.datasource.filters=stat,wall,log4j 
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000 

@Configuration 
public class DruidDBConfig { 
  private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class); 
   
  @Value("${spring.datasource.url}") 
  private String dbUrl; 
   
  @Value("${spring.datasource.username}") 
  private String username; 
   
  @Value("${spring.datasource.password}") 
  private String password; 
   
  @Value("${spring.datasource.driverClassName}") 
  private String driverClassName; 
   
  @Value("${spring.datasource.initialSize}") 
  private int initialSize; 
   
  @Value("${spring.datasource.minIdle}") 
  private int minIdle; 
   
  @Value("${spring.datasource.maxActive}") 
  private int maxActive; 
   
  @Value("${spring.datasource.maxWait}") 
  private int maxWait; 
   
  @Value("${spring.datasource.timeBetweenEvictionRunsMillis}") 
  private int timeBetweenEvictionRunsMillis; 
   
  @Value("${spring.datasource.minEvictableIdleTimeMillis}") 
  private int minEvictableIdleTimeMillis; 
   
  @Value("${spring.datasource.validationQuery}") 
  private String validationQuery; 
   
  @Value("${spring.datasource.testWhileIdle}") 
  private boolean testWhileIdle; 
   
  @Value("${spring.datasource.testOnBorrow}") 
  private boolean testOnBorrow; 
   
  @Value("${spring.datasource.testOnReturn}") 
  private boolean testOnReturn; 
   
  @Value("${spring.datasource.poolPreparedStatements}") 
  private boolean poolPreparedStatements; 
   
  @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}") 
  private int maxPoolPreparedStatementPerConnectionSize; 
   
  @Value("${spring.datasource.filters}") 
  private String filters; 
   
  @Value("{spring.datasource.connectionProperties}") 
  private String connectionProperties; 
   
  @Bean   //声明其为Bean实例 
  @Primary //在同样的DataSource中，首先使用被标注的DataSource 
  public DataSource dataSource(){ 
    DruidDataSource datasource = new DruidDataSource(); 
     
    datasource.setUrl(this.dbUrl); 
    datasource.setUsername(username); 
    datasource.setPassword(password); 
    datasource.setDriverClassName(driverClassName); 
     
    //configuration 
    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.setPoolPreparedStatements(poolPreparedStatements); 
    datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize); 
    try { 
      datasource.setFilters(filters); 
    } catch (SQLException e) { 
      logger.error("druid configuration initialization filter", e); 
    } 
    datasource.setConnectionProperties(connectionProperties); 
     
    return datasource; 
  } 
} 

# 下面为连接池的补充设置，应用到上面所有数据源中

# 初始化大小，最小，最大

spring.datasource.initialSize=5

spring.datasource.minIdle=5

spring.datasource.maxActive=20

# 配置获取连接等待超时的时间

spring.datasource.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

spring.datasource.timeBetweenEvictionRunsMillis=60000

# 配置一个连接在池中最小生存的时间，单位是毫秒

spring.datasource.minEvictableIdleTimeMillis=300000

spring.datasource.validationQuery=SELECT 1 FROM DUAL

spring.datasource.testWhileIdle=true

spring.datasource.testOnBorrow=false

spring.datasource.testOnReturn=false

# 打开PSCache，并且指定每个连接上PSCache的大小

spring.datasource.poolPreparedStatements=true

spring.datasource.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

spring.datasource.filters=stat,wall,log4j

# 通过connectProperties属性来打开mergeSql功能；慢SQL记录

spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

# 合并多个DruidDataSource的监控数据

#spring.datasource.useGlobalDataSourceStat=true

import javax.servlet.annotation.WebFilter; 
import javax.servlet.annotation.WebInitParam; 
 
import com.alibaba.druid.support.http.WebStatFilter; 
 
@WebFilter(filterName="druidWebStatFilter",urlPatterns="/*", 
  initParams={ 
    @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略资源 
  } 
) 
public class DruidStatFilter extends WebStatFilter { 
 
} 

import javax.servlet.annotation.WebInitParam; 
import javax.servlet.annotation.WebServlet; 
 
import com.alibaba.druid.support.http.StatViewServlet; 
 
@WebServlet(urlPatterns="/druid/*", 
  initParams={ 
     @WebInitParam(name="allow",value="127.0.0.1,192.168.163.1"),// IP白名单(没有配置或者为空，则允许所有访问) 
     @WebInitParam(name="deny",value="192.168.1.73"),// IP黑名单 (存在共同时，deny优先于allow) 
     @WebInitParam(name="loginUsername",value="admin"),// 用户名 
     @WebInitParam(name="loginPassword",value="123456"),// 密码 
     @WebInitParam(name="resetEnable",value="false")// 禁用HTML页面上的“Reset All”功能 
}) 
public class DruidStatViewServlet extends StatViewServlet { 
  private static final long serialVersionUID = -2688872071445249539L; 
 
} 

<servlet>  
    <servlet-name>DruidStatView</servlet-name>  
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>  
  </servlet>  
  <servlet-mapping>  
    <servlet-name>DruidStatView</servlet-name>  
    <url-pattern>/druid/*</url-pattern>  
  </servlet-mapping>  

<filter>  
    <filter-name>DruidWebStatFilter</filter-name>  
    <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>  
    <init-param>  
      <param-name>exclusions</param-name>  
      <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>  
    </init-param>  
   </filter>  
   <filter-mapping>  
    <filter-name>DruidWebStatFilter</filter-name>  
    <url-pattern>/*</url-pattern>  
   </filter-mapping>