SpringBoot开发案例之配置Druid数据库连接池的示例

前言

好久没有更新Spring Boot系列文章，你说忙么？也可能是，前段时间的关注点也许在其他方面了，最近项目中需要开发小程序，正好采用Spring Boot实现一个后端服务，后面会把相关的代码案例分享出来，不至于大家做小程序后端服务的时候一头雾水。

在Spring Boot下默认提供了若干种可用的连接池(dbcp,dbcp2, tomcat, hikari)，当然并不支持Druid，Druid来自于阿里系的一个开源连接池，它提供了非常优秀的监控功能，下面跟大家分享一下如何与Spring Boot集成。

版本环境

Spring Boot 1.5.2.RELEASE、Druid 1.1.6、JDK1.7

系统集成

添加pom.xml依赖:

<!-- Jpa -->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- MySql -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- druid -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.1.6</version>
</dependency>

配置application.properties：

#数据源
spring.datasource.url=jdbc:mysql://192.168.1.66:3306/spring_boot?characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# 初始化大小，最小，最大
spring.datasource.initialSize=1
spring.datasource.minIdle=3
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.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.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=30000
spring.datasource.validationQuery=select 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.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.datasource.filters=stat,wall,slf4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

配置yml文件(与上二选一)

spring:
 datasource:
   url: jdbc:mysql://192.168.1.66:3306/spring-boot?useUnicode=true&characterEncoding=utf-8&useSSL=false
   username: root
   password: root
   driver-class-name: com.mysql.jdbc.Driver
   platform: mysql
   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
   initialSize: 1
   minIdle: 3
   maxActive: 20
   # 配置获取连接等待超时的时间
   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
   timeBetweenEvictionRunsMillis: 60000
   # 配置一个连接在池中最小生存的时间，单位是毫秒
   minEvictableIdleTimeMillis: 30000
   validationQuery: select 'x'
   testWhileIdle: true
   testOnBorrow: false
   testOnReturn: false
   # 打开PSCache，并且指定每个连接上PSCache的大小
   poolPreparedStatements: true
   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
   filters: stat,wall,slf4j
   # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
   connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

配置Druid的监控统计功能

import java.sql.SQLException;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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 com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
/**
 * 阿里数据库连接池 Druid配置
 * 创建者 柒
 * 创建时间  2018年3月15日
 */
@Configuration
public class DruidConfiguration {
  private static final Logger logger = LoggerFactory.getLogger(DruidConfiguration.class);
  private static final String DB_PREFIX = "spring.datasource";
  @Bean
  public ServletRegistrationBean druidServlet() {
    logger.info("init Druid Servlet Configuration ");
    ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
    // IP白名单 (没有配置或者为空，则允许所有访问)
    servletRegistrationBean.addInitParameter("allow", "");
    // IP黑名单(共同存在时，deny优先于allow)
    //servletRegistrationBean.addInitParameter("deny", "192.168.1.100");
    //控制台管理用户
    servletRegistrationBean.addInitParameter("loginUsername", "admin");
    servletRegistrationBean.addInitParameter("loginPassword", "admin");
    //是否能够重置数据 禁用HTML页面上的“Reset All”功能
    servletRegistrationBean.addInitParameter("resetEnable", "false");
    return servletRegistrationBean;
  }
  @Bean
  public FilterRegistrationBean filterRegistrationBean() {
    FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
    filterRegistrationBean.addUrlPatterns("/*");
    filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
    return filterRegistrationBean;
  }
  @ConfigurationProperties(prefix = DB_PREFIX)
  class IDataSourceProperties {
    private String url;
    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;
    @Bean
    public DataSource dataSource() {
      DruidDataSource datasource = new DruidDataSource();
      datasource.setUrl(url);
      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);
      try {
        datasource.setFilters(filters);
      } catch (SQLException e) {
        System.err.println("druid configuration initialization filter: " + e);
      }
      datasource.setConnectionProperties(connectionProperties);
      return datasource;
    }
    public String getUrl() {
      return url;
    }
    public void setUrl(String url) {
      this.url = url;
    }
    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;
    }
  }
}

启动应用，访问地址：http://localhost:8080/druid/， 输入配置的账号密码登录之后，即可查看数据源及SQL统计等监控。效果图如下：

当然，阿里巴巴也提供了Druid的SpringBoot集成版(druid-spring-boot-starter)，可参考以下链接。

参考：

https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

https://github.com/alibaba/druid/wiki

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

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