springboot集成druid

springboot集成druid

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dtg</groupId>
    <artifactId>springdruid</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springdruid</name>
    <description>Demo project for Spring Boot</description>
​
    <properties>
        <java.version>1.8</java.version>
    </properties>
​
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
​
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
​
        <!-- druid 依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.21</version>
        </dependency>
​
        <!-- druid监控 依赖-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
​
    </dependencies>
​
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
​
</project>
​

application.yml配置

spring:
 datasource:
  username: root
  password: root
  url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
  driver-class-name: com.mysql.cj.jdbc.Driver
  type: com.alibaba.druid.pool.DruidDataSource
  #Spring Boot 默认是不注入这些属性值的，需要自己绑定
  #druid 数据源专有配置
  initialSize: 5
  minIdle: 5
  maxActive: 20
  maxWait: 60000
  timeBetweenEvictionRunsMillis: 60000
  minEvictableIdleTimeMillis: 300000
  validationQuery: SELECT 1 FROM DUAL
  testWhileIdle: true
  testOnBorrow: false
  testOnReturn: false
  # 打开PSCache
  poolPreparedStatements: true
  #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
  #如果运行时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority
  #则导入 log4j 依赖即可，Maven 地址： https://mvnrepository.com/artifact/log4j/log4j
  filters: stat,wall,log4j,config
  #指定每个连接上PSCache的大小
  maxPoolPreparedStatementPerConnectionSize: 20
  #合并多个DruidDataSource的监控数据
  useGlobalDataSourceStat: true
  #通过connectProperties属性来打开mergeSql功能；慢SQL记录
  connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
​
server:
 port: 8080

新增DruidConfig配置类

使druid 数据源专有配置生效

package com.dtg.springdruid.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.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
​
@Configuration
public class DruidConfig {
​
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }
​
    //因为Springboot内置了servlet容器，所以没有web.xml，替代方法就是将ServletRegistrationBean注册进去
    //加入后台监控
    @Bean  //这里其实就相当于servlet的web.xml
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean <StatViewServlet> bean =
                new ServletRegistrationBean <StatViewServlet>(new StatViewServlet(), "/druid/*");
​
        //后台需要有人登录，进行配置
        //bean.addUrlMappings(); 这个可以添加映射，我们在构造里已经写了
        //设置一些初始化参数
        Map <String, String> initParas = new HashMap <String, String>();
        initParas.put("loginUsername", "admin");//它这个账户密码是固定的
        initParas.put("loginPassword", "123456");
        //允许谁能防伪
        initParas.put("allow", "");//这个值为空或没有就允许所有人访问，ip白名单
        //initParas.put("allow","localhost");//只允许本机访问，多个ip用逗号,隔开
        //initParas.put("deny","");//ip黑名单，拒绝谁访问 deny和allow同时存在优先deny
        initParas.put("resetEnable", "false");//禁用HTML页面的Reset按钮
        bean.setInitParameters(initParas);
        return bean;
    }
​
    //再配置一个过滤器，Servlet按上面的方式注册Filter也只能这样
    @Bean
    public FilterRegistrationBean webStatFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean();
        //可以设置也可以获取,设置一个阿里巴巴的过滤器
        bean.setFilter(new WebStatFilter());
        bean.addUrlPatterns("/*");
        //可以过滤和排除哪些东西
        Map <String, String> initParams = new HashMap <String, String>();
        //把不需要监控的过滤掉,这些不进行统计
        initParams.put("exclusions", "*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        return bean;
    }
}

编写测试类

package com.dtg.springdruid;
​
import com.alibaba.druid.pool.DruidDataSource;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
​
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
​
@SpringBootTest
class SpringdruidApplicationTests {
​
    @Autowired
    DataSource dataSource;
​
​
    @Test
    void contextLoads() {
​
        System.out.println(dataSource.getClass());
        Connection connection = null;
        try {
            connection = dataSource.getConnection();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        System.out.println(connection);
​
        DruidDataSource druidDataSource = (DruidDataSource)dataSource;
        System.out.println(druidDataSource.getMaxActive());
        System.out.println(druidDataSource.getInitialSize());
        try {
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
​
}
​

测试结果

class com.alibaba.druid.pool.DruidDataSource com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@44faa4f2 20 5