SpringBoot初始教程之数据库连接池(druid)

1.介绍

Druid是一个JDBC组件库，包括数据库连接池、SQL Parser等组件。DruidDataSource是最好的数据库连接池。SpringBoot支持任何一种数据库链接池的配置，在这里用druid作为例子进行讲解

2.快速开始

这块先以Spring的JdbcTemplate为列子进行讲解

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>springboot-6</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.26</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.4.1.RELEASE</version>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>

</project>

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配置统一的DataSource,这种方式不太合适生产环境，SpringBoot可以统一的配置application.yaml，但是目前仅仅支持dbcp、dbcp2、hikari 

下面这种方式无法不支持的DruidDataSource的其他参数

application.yaml

spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
username: root
password: qq123456
url: jdbc:mysql://localhost:3306/test1
type: com.alibaba.druid.pool.DruidDataSource

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通过代码的方式进行配置

@SpringBootApplication
public class AppApplication {

public static void main(String[] args) throws Exception {
SpringApplication.run(AppApplication.class, args);
}

/**
* 注册DruidServlet
*
* @return
*/
@Bean
public ServletRegistrationBean druidServletRegistrationBean() {
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
servletRegistrationBean.setServlet(new StatViewServlet());
servletRegistrationBean.addUrlMappings("/druid/*");
return servletRegistrationBean;
}

/**
* 注册DruidFilter拦截
*
* @return
*/
@Bean
public FilterRegistrationBean duridFilterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new WebStatFilter());
Map<String, String> initParams = new HashMap<String, String>();
//设置忽略请求
initParams.put("exclusions", "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*");
filterRegistrationBean.setInitParameters(initParams);
filterRegistrationBean.addUrlPatterns("/*");
return filterRegistrationBean;
}

/**
* 配置DataSource
* @return
* @throws SQLException
*/
@Bean
public DataSource druidDataSource() throws SQLException {
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setUsername("root");
druidDataSource.setPassword("qq123456");
druidDataSource.setUrl("jdbc:mysql://localhost:3306/test1");
druidDataSource.setMaxActive(100);
druidDataSource.setFilters("stat,wall");
druidDataSource.setInitialSize(10);
return druidDataSource;
}

}

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这块采用的是

ServletRegistrationBean

 和

FilterRegistrationBean

的方式进行注册Servlet和Filter，这种是SpingBoot里面提供支持原生的方式 

除了这种方式还可以采用其他方式进行配置，采用Servlet3.0的注解Servlet进行配置

这块配置基本就完事了，可以访问本地链接http://localhost:8080/druid/datasource.html查看监控信息

官方资料

其他的详细配置可以查看官方文档进行配置，这里不过多讲述 
https://github.com/alibaba/druid/wiki/%E9%A6%96%E9%A1%B5

本文代码

https://git.oschina.net/wangkang_daydayup/SpringBoot-Learn/tree/master