第5步 集成 Druid 数据源

什么是druid

1，druid 是阿里的一个开源的jdbc 应用组件 ，虽然spring boot 提供了 其他的数据库连接方式，我问建议使用druid 数据库组件，因为他在提供了数据库连接的同时，还提供了，数据库监控 ，性能检测 等扩展的功能。 我们在项目中增加依赖： pom.xml 增加 durid log4j 两个引用。

<!-- druid log4j  -->
	<dependency>
	   <groupId>com.alibaba</groupId>
	   <artifactId>druid-spring-boot-starter</artifactId>
	   <version>1.1.10</version>
	</dependency>
	 
	<dependency>
	    <groupId>log4j</groupId>
	    <artifactId>log4j</artifactId>
	    <version>1.2.17</version>
	</dependency>

application.yml 修改

spring:
  datasource:
    name: druidDataSource
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/spring_boot_database?characterEncoding=utf-8&autoReconnect=true&failOverReadOnly=false&useSSL=true&serverTimezone=UTC
      username: root
      password: qhdswchzh
           # 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,config
           # 连接池的配置信息
           # 初始化大小，最小等待连接数量，最大等待连接数量，最大连接数
      min-idle: 1
      max_idle: 100
      max-active: 1000
      initial-size: 1
           # 配置获取连接等待超时的时间
      max-wait: 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
      time-between-eviction-runs-millis: 60000
           # 配置一个连接在池中最小生存的时间，单位是毫秒
      min-evictable-idle-time-millis: 300000
      validation-query: select 'x'
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
           # 打开PSCache，并且指定每个连接上PSCache的大小
      pool-prepared-statements: true
      max-open-prepared-statements: 50
      max-pool-prepared-statement-per-connection-size: 20

启动项目 后台一切正常。项目启动正常。打开 swagger 测试接口数据正常。

http://localhost:8001/swagger-ui.html#/sys-user-controller

配置 DuridConfig.java

  package com.ylz.spring_boot.config;

import java.sql.SQLException;

import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
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;


@Configuration
@EnableConfigurationProperties({DruidDataSourceProperties.class})
public class DruidConfig {
    @Autowired
    private DruidDataSourceProperties properties;

    @Bean
    @ConditionalOnMissingBean
    public DataSource druidDataSource() {
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName(properties.getDriverClassName());
        druidDataSource.setUrl(properties.getUrl());
        druidDataSource.setUsername(properties.getUsername());
        druidDataSource.setPassword(properties.getPassword());
        druidDataSource.setInitialSize(properties.getInitialSize());
        druidDataSource.setMinIdle(properties.getMinIdle());
        druidDataSource.setMaxActive(properties.getMaxActive());
        druidDataSource.setMaxWait(properties.getMaxWait());
        druidDataSource.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRunsMillis());
        druidDataSource.setMinEvictableIdleTimeMillis(properties.getMinEvictableIdleTimeMillis());
        druidDataSource.setValidationQuery(properties.getValidationQuery());
        druidDataSource.setTestWhileIdle(properties.isTestWhileIdle());
        druidDataSource.setTestOnBorrow(properties.isTestOnBorrow());
        druidDataSource.setTestOnReturn(properties.isTestOnReturn());
        druidDataSource.setPoolPreparedStatements(properties.isPoolPreparedStatements());
        druidDataSource.setMaxPoolPreparedStatementPerConnectionSize(properties.getMaxPoolPreparedStatementPerConnectionSize());

        try {
            druidDataSource.setFilters(properties.getFilters());
            druidDataSource.init();
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return druidDataSource;
    }

    /**
     * 注册Servlet信息， 配置监控视图
     *
     * @return
     */
    @Bean
    @ConditionalOnMissingBean
    public ServletRegistrationBean<Servlet> druidServlet() {
        ServletRegistrationBean<Servlet> servletRegistrationBean = new ServletRegistrationBean<Servlet>(new StatViewServlet(), "/druid/*");

        //白名单：
//        servletRegistrationBean.addInitParameter("allow","127.0.0.1,139.196.87.48");
        //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","192.168.1.119");
        //登录查看信息的账号密码, 用于登录Druid监控后台
        servletRegistrationBean.addInitParameter("loginUsername", "ysuylz");
        servletRegistrationBean.addInitParameter("loginPassword", "123qwe");
        //是否能够重置数据.
        servletRegistrationBean.addInitParameter("resetEnable", "true");
        return servletRegistrationBean;

    }

    /**
     * 注册Filter信息, 监控拦截器
     *
     * @return
     */
    @Bean
    @ConditionalOnMissingBean
    public FilterRegistrationBean<Filter> filterRegistrationBean() {
        FilterRegistrationBean<Filter> filterRegistrationBean = new FilterRegistrationBean<Filter>();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }
}

DruidDataSourceProperties.java

package com.ylz.spring_boot.config;

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

@ConfigurationProperties(prefix = "spring.datasource.druid")
public class DruidDataSourceProperties {

	// jdbc
	private String driverClassName;
	private String url;
	private String username;
	private String password;
	// jdbc connection pool
	private int initialSize;
	private int minIdle;
	private int maxActive = 100;
	private long maxWait;
	private long timeBetweenEvictionRunsMillis;
	private long minEvictableIdleTimeMillis;
	private String validationQuery;
	private boolean testWhileIdle;
	private boolean testOnBorrow;
	private boolean testOnReturn;
	private boolean poolPreparedStatements;
	private int maxPoolPreparedStatementPerConnectionSize;
	// filter
	private String filters;

	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 long getMaxWait() {
		return maxWait;
	}

	public void setMaxWait(long maxWait) {
		this.maxWait = maxWait;
	}

	public long getTimeBetweenEvictionRunsMillis() {
		return timeBetweenEvictionRunsMillis;
	}

	public void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis) {
		this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
	}

	public long getMinEvictableIdleTimeMillis() {
		return minEvictableIdleTimeMillis;
	}

	public void setMinEvictableIdleTimeMillis(long 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 getDriverClassName() {
		return driverClassName;
	}

	public void setDriverClassName(String driverClassName) {
		this.driverClassName = driverClassName;
	}

	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;
	}

}

查看druid的监控信息：

打开链接地址： http://localhost:8001/druid/login.html

输入用户名和密码：

用户名和密码在 DruidConfig.java 文件中配置的。 自己可以去里面修改。
账号： bitgeek
密码： sa

根据中文内容自己查看相关的信息。