DataSource配置

一、JDBC

Jar依赖：

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

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

数据源的相关参数配置：DataSourceProperties

application.properties：

spring.datasource.url=jdbc:mysql://localhost:3306/arch1
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=123456

默认是用org.apache.tomcat.jdbc.pool.DataSource作为数据源

二、Druid DataSource

引入Jar依赖：

　　　　　<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>

application-dev.properties

spring.datasource.url=jdbc:mysql://localhost:3306/arch1
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.username=root
spring.datasource.password=123456

##########################  druid配置   ##########################
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

# 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
# 校验SQL，Oracle配置 spring.datasource.validationQuery=SELECT 1 FROM DUAL，如果不配validationQuery项，则下面三项配置无用  
spring.datasource.validationQuery=SELECT 'x'
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

为了使spring.datasource.initialSize、spring.datasource.minIdle等属性生效，可以使用ConfigurationProperties(prefix="spring.datasource")引入

配置类DruidConfig

@Configuration
public class DruidConfig {
    
    @Bean
    @ConfigurationProperties(prefix="spring.datasource")
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }
    
    @Bean
    public ServletRegistrationBean startViewServlet(){
        ServletRegistrationBean druidServlet =new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        
        Map<String,String> initParams =new HashMap<String,String>();
        initParams.put("loginUsername", "root");
        initParams.put("loginPassword", "root");
        
        initParams.put("allow","");//默认就是允许
        initParams.put("deny","192.168.15.21");
        
        druidServlet.setInitParameters(initParams);
        
        return druidServlet;
    }
    
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean filter =new FilterRegistrationBean();
        filter.setFilter(new WebStatFilter());
        
        Map<String,String> initParams = new HashMap<>();
        initParams.put("exclusions","*.js,*.css,/druid/*");
        filter.setInitParameters(initParams);
        filter.setUrlPatterns(Arrays.asList("/*"));
        
        return filter;
    }
    
    
    
}

　　监控测试：