SpringBoot整合Druid数据源过程详解

这篇文章主要介绍了SpringBoot整合Druid数据源过程详解,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

1.数据库结构

2.项目结构

3.pom.xml文件

<dependencies>
 <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-jdbc</artifactId>
 </dependency>
 <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <scope>runtime</scope>
 </dependency>

<!--引入druid数据源 -->
 <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
 <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid</artifactId>
   <version>1.1.8</version>
 </dependency>

<!-- https://mvnrepository.com/artifact/log4j/log4j -->
 <!-- 如果 不加入这依赖    配置监控统计拦截的filters时  这个会报错 filters: stat,wall,log4j  -->
 <dependency>
   <groupId>log4j</groupId>
   <artifactId>log4j</artifactId>
   <version>1.2.17</version>
 </dependency>

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

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
 </dependency>
</dependencies>

<build>
 <plugins>
   <plugin>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-maven-plugin</artifactId>
   </plugin>
 </plugins>
</build>

4.application.yml配置文件

spring:
datasource:
 username: root
 password: wangqing
 url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
 driver-class-name: com.mysql.jdbc.Driver
 type: com.alibaba.druid.pool.DruidDataSource

#  数据源其他配置
 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
 filters: stat,wall,log4j
 maxPoolPreparedStatementPerConnectionSize: 20
 useGlobalDataSourceStat: true
 connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
 # 合并多个DruidDataSource的监控数据
 #useGlobalDataSourceStat: true

mybatis:
# 指定全局配置文件位置
#config-location: classpath:mybatis/mybatis-config.xml
# 指定sql映射文件位置
mapper-locations: classpath:mapper/*.xml      #如src/main/resources下的mappers文件下的TUserMapper.xml

#  schema:
#   - classpath:sql/department.sql     #根据department.sql 的sql语句创建表
#   - classpath:sql/employee.sql

5.创建一个DruidConfig的配置类，实例化Druid Datasource

package com.qingfeng.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.Arrays;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {
//指定加载appliction.yml文件里面的spring.datasource开头的
// DruidDataSource类里面的属性与appliction.yml文件里面的spring.datasource开头的对应映射
 @ConfigurationProperties(prefix = "spring.datasource")
 @Bean
 public DataSource druid(){
   return new DruidDataSource();
 }

//配置Druid的监控
 //1、配置一个管理后台的Servlet
 @Bean
 public ServletRegistrationBean statViewServlet(){
   ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
   Map<String,String> initParams = new HashMap<>();

initParams.put("loginUsername","admin");
   initParams.put("loginPassword","123456");
   initParams.put("allow","");//默认就是允许所有访问
   initParams.put("deny","");

bean.setInitParameters(initParams);
   return bean;
 }

//2、配置一个web监控的filter
 @Bean
 public FilterRegistrationBean webStatFilter(){
   FilterRegistrationBean bean = new FilterRegistrationBean();
   bean.setFilter(new WebStatFilter());
   Map<String,String> initParams = new HashMap<>();
   initParams.put("exclusions","*.js,*.css,/druid/*");
   bean.setInitParameters(initParams);
   bean.setUrlPatterns(Arrays.asList("/*"));
   return bean;
 }
}

6.创建一个UserController类测试

package com.qingfeng.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;

@Controller
public class UserController {

@Autowired
 JdbcTemplate jdbcTemplate;
 @ResponseBody
 @GetMapping("/query")
 public Map<String,Object> map(){
   List<Map<String, Object>> list = jdbcTemplate.queryForList("select * FROM user");
   return list.get(0);
 }
}

7.运行项目，通过浏览器访问 http://localhost:8080/query

8.我们DruidConfig类里配置的下面代码可以帮我们实现监控

//配置Druid的监控
 //1、配置一个管理后台的Servlet
 @Bean
 public ServletRegistrationBean statViewServlet(){
   ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
   Map<String,String> initParams = new HashMap<>();

initParams.put("loginUsername","admin");
   initParams.put("loginPassword","123456");
   initParams.put("allow","");//默认就是允许所有访问
   initParams.put("deny","");

bean.setInitParameters(initParams);
   return bean;
 }

9.我们启动项目，打开网址：http://localhost:8080/druid/login.html 可以通过登录，查看druid数据源状态监控

我们上面设置的是用户名：admin 密码：123456

来源：https://www.cnblogs.com/Amywangqing/p/11964707.html