详解SpringBoot配置连接池

详解SpringBoot配置连接池

内置的连接池

目前spring Boot中默认支持的连接池有dbcp,dbcp2, tomcat, hikari三种连接池。

数据库连接可以使用DataSource池进行自动配置。

由于Tomcat数据源连接池的性能和并发，在tomcat可用时，我们总是优先使用它。

如果HikariCP可用，我们将使用它。

如果Commons DBCP可用，我们将使用它，但在生产环境不推荐使用它。

最后，如果Commons DBCP2可用，我们将使用它。

以上的几种连接池，可以通过在配置application文件中配置。

spring.datasource.url=jdbc:mysql://localhost/test

spring.datasource.username=dbuser

spring.datasource.password=dbpass

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Spring Boot能够从大多数数据库的url上推断出driver-class-name，你就不需要再指定它了。对于一个将要创建的DataSource连接池，我们需要能够验证Driver是否可用，所以我们会在做任何事情之前检查它。比如，如果你设置spring.datasource.driverClassName=com.MySQL.jdbc.Driver，然后这个类就会被加载。

配置Druid连接池

在SpringBoot 的1.5.2版本中不在支持自动配druid，，即无法通过配置项直接支持相应的连接池；这里列出的这些配置项可以通过定制化DataSource来实现。

druid介绍

Druid是一个JDBC组件，它包括三部分：

DruidDriver 代理Driver，能够提供基于Filter－Chain模式的插件体系。

DruidDataSource 高效可管理的数据库连接池。

SQLParser

Druid可以做什么

可以监控数据库访问性能，Druid内置提供了一个功能强大的StatFilter插件，能够详细统计SQL的执行性能，这对于线上分析数据库访问性能有帮助。

替换DBCP和C3P0。Druid提供了一个高效、功能强大、可扩展性好的数据库连接池。

数据库密码加密。直接把数据库密码写在配置文件中，这是不好的行为，容易导致安全问题。DruidDruiver和DruidDataSource都支持PasswordCallback。

SQL执行日志，Druid提供了不同的LogFilter，能够支持Common-Logging、Log4j和JdkLog，你可以按需要选择相应的LogFilter，监控你应用的数据库访问情况。

扩展JDBC，如果你要对JDBC层有编程的需求，可以通过Druid提供的Filter-Chain机制，很方便编写JDBC层的扩展插件。

项目地址： https://github.com/alibaba/druid

Spring Boot与Druid的集成

MySQL Driver驱动包：

mysql

mysql-connector-java

runtime

阿里系的Druid依赖包：

com.alibaba

druid

1.0.25

application.properties配置信息

# 驱动配置信息

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

spring.datasource.url = jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8

spring.datasource.username = root

spring.datasource.password = adminter

spring.datasource.driverClassName = com.mysql.jdbc.Driver

#连接池的配置信息

## 初始化大小，最小，最大

spring.druid.initialSize=5

spring.druid.minIdle=5

spring.druid.maxActive=20

## 配置获取连接等待超时的时间

spring.druid.maxWait=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

spring.druid.timeBetweenEvictionRunsMillis=60000

# 配置一个连接在池中最小生存的时间，单位是毫秒

spring.druid.minEvictableIdleTimeMillis=300000

spring.druid.validationQuery=SELECT 1 FROM DUAL

spring.druid.testWhileIdle=true

spring.druid.testOnBorrow=false

spring.druid.testOnReturn=false

spring.druid.poolPreparedStatements=true

spring.druid.maxPoolPreparedStatementPerConnectionSize=20

# 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

spring.druid.filters=stat,wall,log4j

# 通过connectProperties属性来打开mergeSql功能；慢SQL记录

spring.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

DruidSource配置信息的定制

package com.lf.datasource;

import com.alibaba.druid.pool.DruidDataSource;

import org.springframework.boot.context.properties.ConfigurationProperties;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;

import java.sql.SQLException;

/**

* Created by LF on 2017/4/18.

*/

@ConfigurationProperties(prefix = "spring.druid")

public class DruidSource {

private String dbUrl;

private String username;

private String password;

private String driverClassName;

private int initialSize;

private int minIdle;

private int maxActive;

private int maxWait;

private int timeBetweenEvictionRunsMillis;

private int minEvictableIdleTimeMillis;

private String validationQuery;

private boolean testWhileIdle;

private boolean testOnBorrow;

private boolean testOnReturn;

private boolean poolPreparedStatements;

private int maxPoolPreparedStatementPerConnectionSize;

private String filters;

private String connectionProperties;

public String getDbUrl() {

return dbUrl;

}

public void setDbUrl(String dbUrl) {

this.dbUrl = dbUrl;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getDriverClassName() {

return driverClassName;

}

public void setDriverClassName(String driverClassName) {

this.driverClassName = driverClassName;

}

public int getInitialSize() {

return initialSize;

}

public void setInitialSize(int initialSize) {

this.initialSize = initialSize;

}

public int getMinIdle() {

return minIdle;

}

public void setMinIdle(int minIdle) {

this.minIdle = minIdle;

}

public int getMaxActive() {

return maxActive;

}

public void setMaxActive(int maxActive) {

this.maxActive = maxActive;

}

public int getMaxWait() {

return maxWait;

}

public void setMaxWait(int maxWait) {

this.maxWait = maxWait;

}

public int getTimeBetweenEvictionRunsMillis() {

return timeBetweenEvictionRunsMillis;

}

public void setTimeBetweenEvictionRunsMillis(int timeBetweenEvictionRunsMillis) {

this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;

}

public int getMinEvictableIdleTimeMillis() {

return minEvictableIdleTimeMillis;

}

public void setMinEvictableIdleTimeMillis(int minEvictableIdleTimeMillis) {

this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;

}

public String getValidationQuery() {

return validationQuery;

}

public void setValidationQuery(String validationQuery) {

this.validationQuery = validationQuery;

}

public boolean isTestWhileIdle() {

return testWhileIdle;

}

public void setTestWhileIdle(boolean testWhileIdle) {

this.testWhileIdle = testWhileIdle;

}

public boolean isTestOnBorrow() {

return testOnBorrow;

}

public void setTestOnBorrow(boolean testOnBorrow) {

this.testOnBorrow = testOnBorrow;

}

public boolean isTestOnReturn() {

return testOnReturn;

}

public void setTestOnReturn(boolean testOnReturn) {

this.testOnReturn = testOnReturn;

}

public boolean isPoolPreparedStatements() {

return poolPreparedStatements;

}

public void setPoolPreparedStatements(boolean poolPreparedStatements) {

this.poolPreparedStatements = poolPreparedStatements;

}

public int getMaxPoolPreparedStatementPerConnectionSize() {

return maxPoolPreparedStatementPerConnectionSize;

}

public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {

this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;

}

public String getFilters() {

return filters;

}

public void setFilters(String filters) {

this.filters = filters;

}

public String getConnectionProperties() {

return connectionProperties;

}

public void setConnectionProperties(String connectionProperties) {

this.connectionProperties = connectionProperties;

}

@Bean //声明其为Bean实例

@Primary //在同样的DataSource中，首先使用被标注的DataSource

public DataSource dataSource() throws SQLException {

DruidDataSource datasource = new DruidDataSource();

SOhAvv

datasource.setUrl(this.dbUrl);

datasource.setUsername(username);

datasource.setPassword(password);

datasource.setDriverClassName(driverClassName);

//configuration

datasource.setInitialSize(initialSize);

datasource.setMinIdle(minIdle);

datasource.setMaxActive(maxActive);

datasource.setMaxWait(maxWait);

datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);

datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);

datasource.setValidationQuery(validationQuery);

datasource.setTestWhileIdle(testWhileIdle);

datasource.setTestOnBorrow(testOnBorrow);

datasource.setTestOnReturn(testOnReturn);

datasource.setPoolPreparedStatements(poolPreparedStatements);

datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);

datasource.setFilters(filters);

return datasource;

}

}

基于注解的配置StatView的Servlet

Filter的实现类：

package com.lf.config;

import com.alibaba.druid.support.http.WebStatFilter;

import javax.servlet.annotation.WebFilter;

import javax.servlet.annotation.WebInitParam;

/**

* Created by LF on 2017/4/18.

*/

@WebFilter(filterName = "druidWebStatFilter", urlPatterns = "/*",

initParams = {

@WebInitParam(name = "exclusions", value = "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")//忽略资源

}

)

public class DruidStatFilter extends WebStatFilter {

}

StatViewServlet:

package com.lf.config;

import com.alibaba.druid.support.http.StatViewServlet;

import javax.servlet.annotation.WebInitParam;

import javax.servlet.annotation.WebServlet;

/**

* Created by LF on 2017/4/18.

*/

@WebServlet(urlPatterns = "/druid/*",

initParams = {

@WebInitParam(name = "allow", value = "127.0.0.1,192.168.163.1"),// IP白名单(没有配置或者为空，则允许所有访问)

@WebInitParam(name = "deny", value = "192.168.1.73"),// IP黑名单 (存在共同时，deny优先于allow)

@WebInitParam(name = "loginUsername", value = "admin"),// 用户名

@WebInitParam(name = "loginPassword", value = "123456"),// 密码

@WebInitParam(name = "resetEnable", value = "false")// 禁用HTML页面上的“Reset All”功能

})

public class DruidStatViewServlet extends StatViewServlet {

private static final long serialVersionUID = -2688872071445249539L;

}

在启动类上加入@ServletComponentScan注解

基于Java的配置StatView的Servlet

package com.lf.config;

import com.alibaba.druid.support.http.StatViewServlet;

import com.alibaba.druid.support.http.WebStatFilter;

import org.springframework.boot.web.servlet.FilterRegistrationBean;

import org.springframework.boothttp://.web.servlet.ServletRegistrationBean;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

/**

* Created by LF on 2017/4/18.

*/

@Configuration

public class DruidConfig {

@Bean

public ServletRegistrationBean registrationBean() {

ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet()); //添加初始化参数：initParams

servletRegistrationBean.addUrlMappings("/druid/*");

//白名单：

servletRegistrationBean.addInitParameter("allow", "127.0.0.1");

//IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.

servletRegistrationBean.addInitParameter("deny", "192.168.1.73");

//登录查看信息的账号密码.

servletRegistrationBean.addInitParameter("loginUsername", "admin");

servletRegistrationBean.addInitParameter("loginPassword", "123456");

//是否能够重置数据.

servletRegistrationBean.addInitParameter("resetEnable", "false");

return servletRegistrationBean;

}

@Bean

public FilterRegistrationBean filterRegistrationBean() {

FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());

//添加过滤规则.

filterRegistrationBean.addUrlPatterns("/*");

//添加不需要忽略的格式信息.

filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");

return filterRegistrationBean;

}

}

运行界面以及介绍

访问地址： http://192.168.163.1:8080/druid/index.html

账号和密码为在servlet中配置的

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