spring boot Jpa与数据库连接池Druid配置

Druid是阿里巴巴开源的数据库连接池，号称是Java语言中最好的数据库连接池，能够提供强大的监控和扩展功能。GitHub地址：https://github.com/alibaba/druid。

首先，使用工具：

1.data jpa

2.druid

3.spring boot 2.1.0

首先写配置文件，这里我这里使用的时application.properties

# datasource
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.username=root
spring.datasource.password=
# 下面为连接池的补充设置，应用到上面所有数据源中
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
# 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
spring.datasource.logSlowSql=true

由于spring boot默认是不支持Druid的，所以需要配置一下

首先实例化Durid DataSource,这里采用注解的方式。

@Configuration
@Primary
public class DruidDataSourceConfig{

	@Bean(name = "springDruidDataSource")
	@ConfigurationProperties("spring.datasource") // 该注解可以自动注入对象的属性(对应配置文件spring.datasource下的属性)
	public DruidDataSource newsPoiDataSource() {
		return new DruidDataSource();
	}
}

接下来配置监控器，过滤不需要监控的视图，配置监控视图。

@Configuration
public class DruidConfiguration {

	private static final Logger logger = LoggerFactory.getLogger(DruidConfiguration.class);

	@Bean
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public ServletRegistrationBean druidServlet() {
		logger.info("init Druid Servlet Configuration ");
		ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),
				"/druid/*");
		// IP白名单
		servletRegistrationBean.addInitParameter("allow", "");
		// IP黑名单(共同存在时，deny优先于allow)
		servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
		// 控制台管理用户
		servletRegistrationBean.addInitParameter("loginUsername", "admin");
		servletRegistrationBean.addInitParameter("loginPassword", "admin");
		// 是否能够重置数据 禁用HTML页面上的“Reset All”功能
		servletRegistrationBean.addInitParameter("resetEnable", "false");
		return servletRegistrationBean;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	@Bean
	public FilterRegistrationBean filterRegistrationBean() {
		FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
		filterRegistrationBean.addUrlPatterns("/*");
		filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
		return filterRegistrationBean;
	}

xml依赖：

<!-- 添加druid依赖 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.1.10</version>
		</dependency>
		<dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
		<!-- 添加data jpa依赖 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<!-- 添加mysql依赖 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>