springboot使用druid鏈接池，並配置數據源監控

首先確定是引入druid的依賴:

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

而後將druid配置到項目中：

在application.yml中加入

spring:
    datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        
        ###數據源的其餘配置
        initialSize: 5
        minIdle: 5
        maxActive: 20
        maxWait: 60000
        timeBetweenEvictionRunsMillis: 60000
        minEvictableIdleTimeMillis: 300000
        validationQuery: SELECT 1 FROM DUAL
        testWhileIdle: true
        testOnBorrow: false
        testOnReturn: false
        poolPreparedStatements: true
        ### 配置監控統計攔截的filters，去掉後監控界面sql沒法統計，'wall'用於防火牆
        filters: stat,wall,log4j
        maxPoolPreparedStatementPerConnectionSize: 20
        useGlobalDataSourceStat: true
        connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

這裏配置好以後，數據源是從默認的tomcat.pool切換到了druid，但是druid的屬性好比initialSize、minIdle還未生效，由於在DataSourceProperties.class下沒有對應的匹配項，因此還須要咱們手動配置:

新建DruidConfig.java

@Configuration
public class DruidConfig {
    // 將全部前綴爲spring.datasource下的配置項都加載到DataSource中
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }
}

至此，Druid的全部配置都已完成，打斷點能夠看到配置已經生效：

最後，須要配置druid的監控頁面

在上面的DruidConfig中加入代碼：

@Bean
    public ServletRegistrationBean druidStatViewServlet() {
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");
        Map<String, String> initParams = new HashMap<>();
        //　可配的屬性都在 StatViewServlet 和其父類下
        initParams.put("loginUsername", "admin-druid");
        initParams.put("loginPassword", "111111");
        servletRegistrationBean.setInitParameters(initParams);
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean druidWebStatFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        Map<String, String> initParams = new HashMap<>();
        initParams.put("exclusions", "*.js,*.css,/druid/*");
        filterRegistrationBean.setInitParameters(initParams);
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
        return filterRegistrationBean;
    }

打開瀏覽器測試輸入：http://localhost:8080/druid/login.html

能夠看到

輸入咱們剛纔在servlet中配置的帳號密碼就能夠登陸了