springboot 整合druid

目录

https://github.com/sevenyoungairye/spring-boot-study

• druid优点：提供性能监控，配置灵活丰富

1. maven依赖

<!-- mysql驱动 springboot内置 -->
 <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <scope>runtime</scope>
 </dependency>

 <!--druid 数据源-->
 <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
     <version>1.1.21</version>
 </dependency>

2. yml配置

spring:
  datasource:
    username: root
    password: 123456
    # springboot默认数据源com.zaxxer.hikari.HikariDataSource # 比druid快
    url: jdbc:mysql://localhost:3306/mybatis_study?serverTimezone=GMT
    driver-class-name: com.mysql.cj.jdbc.Driver

    # 切换成druid 有性能监控...
    type: com.alibaba.druid.pool.DruidDataSource

    # 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
    initial-size: 5
    min-idle: 5
    max-active: 20
    # 配置获取连接等待超时的时间
    max-wait: 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
    time-between-eviction-runs-millis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒
    min-evictable-idle-time-millis: 300000
    validation-query: SELECT 1 FROM DUAL
    test-while-idle: true
    test-on-borrow: false
    test-on-return: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    pool-prepared-statements: true
    #   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
    max-pool-prepared-statement-per-connection-size: 20
    filters: stat,wall
    use-global-data-source-stat: true
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connect-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

3. druid配置类编写

package cn.bitqian.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.Filter;
import java.util.HashMap;
import java.util.Map;

/**
 * druid 配置类
 * @author echo lovely
 * @date 2020/10/23 22:01
 */
@Configuration
public class DruidConfig {

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DruidDataSource druidDataSource() {

        return new DruidDataSource();
    }

    // 后台监控: web.xml ServletRegistrationBean
    // spring boot 内置了servlet 没有web.xml配置文件，所以用下面的方式配置
    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean servletRegistrationBean = new
                ServletRegistrationBean(new StatViewServlet(), "/druid/*");

        Map<String, String> initParameters = new HashMap<>();

        // 后台登录的账号密码
        // initParameters.put("jmxUsername", "admin"); // loginUsername
        // initParameters.put("jmxPassword", "123"); // loginPassword
        initParameters.put("loginUsername", "admin"); // loginUsername
        initParameters.put("loginPassword", "123"); // loginPassword

        // 允许访问 白名单
        initParameters.put("allow", "127.0.0.1");

        // initParameters.put("deny", "168.403.432.234"); 禁止访问黑名单

        servletRegistrationBean.setInitParameters(initParameters);

        return servletRegistrationBean;
    }

    /**
     * 过滤器
     * @return null
     */
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();

        // 过滤请求
        filterRegistrationBean.setFilter(new WebStatFilter());

        Map<String, String> initParameters = new HashMap<>();

        // 设置静态资源放行
        initParameters.put("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");

        filterRegistrationBean.setInitParameters(initParameters);

        return filterRegistrationBean;
    }


}

4. 后台性能监控

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本文地址：https://blog.csdn.net/qq_44783283/article/details/109273616