spring boot 配置druid数据源

╰半夏微凉° 2022-08-21 12:49 8阅读 0赞

druid目前是国内最好的数据源了吧，下面利用druid来demo演示下spring boot如何配置jdbc数据源

1.在pom.xml中引入相关依赖

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
    <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.15</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.23</version>
    </dependency>

上面引入spring-boot-starter-data-jpa，将引入spring-data-jpa和hibernate，hibernate是jpa的实现者，而spring data jpa在hibernate的基础上，再封装已层，数据访问更加方便和快速

2.在配置文件中，引入数据源配置参数

# 数据源基础配置
    spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver
    spring.datasource.url=jdbc:mysql://localhost:3306/test
    spring.datasource.username=root
    spring.datasource.password=root
    
    # 连接池配置
    # 初始化大小，最小，最大
    spring.datasource.initialSize=1
    spring.datasource.minIdle=1
    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=false
    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
    
    # 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
    
    # 是否在控制台显示sql语句
    spring.jpa.show-sql=true

如果想要在java代码读取这些配置，可以配置个实体类

@Component
    @ConfigurationProperties(prefix="spring.datasource")
    public class DatasourceSettings { 
    
        private String type ;
        private String driver ;
        private String url ;
        private String username ;
        private String password ;
    
        private int initialSize ;
        private int minIdle ;
        private int maxActive ;
        private int maxWait ;
        private int timeBetweenEvictionRunsMillis ;
        private int minEvictableIdleTimeMillis ;
        private String validationQuery ;
        private boolean testWhileIdle ;
        private boolean testOnBorrow ;
        private boolean testOnReturn ;
        private boolean poolPreparedStatements ;
        private int maxPoolPreparedStatementPerConnectionSize;
        private String filters ;
        private String connectionProperties ;
    
        //sets and gets ..
    
    }

使用的时候，直接注入即可

@Autowired DatasourceSettings ds ;

3.配置/druid的数据监控页面路径还有拦截路径

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

这时可以在地址栏输入[http://localhost:8080/demo/druid/][http_localhost_8080_demo_druid]来看看监控页面数据

![这里写图片描述][20160502182357537]

到这里就已经把druid配置成功了，spring jpa data 也可以正常使用了

[http_localhost_8080_demo_druid]: http://localhost:8080/demo/druid/
[20160502182357537]: /images/20220724/5e12e125e0274e3b8a6aafc0d0d8b475.png