Spring Boot2.1.9：整合Druid 数据源与监控

本文链接： https://blog.csdn.net/lhh143400/article/details/102761523

1.pom.xml
<!-- 阿里数据连接池 -->
<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid-spring-boot-starter</artifactId>
   <version>1.1.20</version>
</dependency>

<!-- MySql -->
    <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.47</version>
</dependency>

<!-- Oracle -->
<dependency>
   <groupId>com.oracle</groupId>
   <artifactId>ojdbc6</artifactId>
   <version>11.2.0.3</version>
</dependency>

<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <optional>true</optional>
</dependency>

2.application.properties

#MySql 数据源配置

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

spring.datasource.druid.url=jdbc:mysql://127.0.0.1:3306/mango?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
spring.datasource.druid.username=root
spring.datasource.druid.password=root
spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver

#Oracle 数据源配置

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

spring.datasource.druid.driver-class-name=oracle.jdbc.OracleDriver
spring.datasource.druid.url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
spring.datasource.druid.username=news
spring.datasource.druid.password=news_1

#监控配置

# 初始化大小
spring.datasource.druid.initial-size=1
#最小连接数
spring.datasource.druid.min-idle=1
#最大连接数
spring.datasource.druid.max-active=20
# 配置获取连接等待超时的时间
spring.datasource.druid.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
spring.datasource.druid.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
spring.datasource.druid.min-evictable-idle-time-millis=300000
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
spring.datasource.druid.test-while-idle=true
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.druid.pool-prepared-statements=50
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=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.druid.filters=stat,wall,config

#新建文件 DruidConfig、DruidDataSourcePropertiesConfig

1）数据源监控属性配置 和 上面的监控配置有关  DruidDataSourcePropertiesConfig

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

/**
 * 数据源监控属性  配置
 *
 * @author lhh
 * @Date 2019/10/26 22:03
 */
@ConfigurationProperties(prefix = "spring.datasource.druid")
@Data
public class DruidDataSourcePropertiesConfig {

    private String driverClassName;
    private String url;
    private String username;
    private String password;
    private int initialSize;
    private int minIdle;
    private int maxActive;
    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;
    private String filters;
}

2）注入属性和配置连接池 DruidConfig

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
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 javax.servlet.Servlet;
import javax.sql.DataSource;
import java.sql.SQLException;

/**
 * 数据源监控 配置Servlet 和 Filter
 * 主要是注入属性和配置连接池 黑白名单，监控管理后台账号密码等配置
 *
 * 访问： http://localhost:8080/druid/login.html
 *
 * @author lhh
 * @Date 2019/10/26 22:43
 */
@Configuration
@EnableConfigurationProperties({DruidDataSourcePropertiesConfig.class})
public class DruidConfig {

    @Autowired
    private DruidDataSourcePropertiesConfig 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
     * 相当于Web Servlet配置
     *
     * @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");
        //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", "");
        //登录查看信息的账号密码, 用于登录Druid监控后台
        servletRegistrationBean.addInitParameter("loginUsername", "admin");
        servletRegistrationBean.addInitParameter("loginPassword", "admin");
        //是否能够重置数据.
        servletRegistrationBean.addInitParameter("resetEnable", "true");
        return servletRegistrationBean;

    }


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

}

查看监控视图

启动应用，访问： http://localhost:8080/druid/login.html，进入Druid监控后台页面。

遇到的问题

Caused by: java.lang.IllegalStateException: dbType not support : null, url null //非法语句异常

原先填的：

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mango?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

修改之后就没有报此错了：

spring.datasource.druid.url=jdbc:mysql://127.0.0.1:3306/mango?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8
spring.datasource.druid.username=root
spring.datasource.druid.password=root
spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver

分析为什么：debug 测试是因为 DruidDataSource 注入属性url，username,password，driver-class-name为空导致的问题。

更多资料参考:

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

监控配置 Druid Spring Starter: https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

官方文档 https://github.com/alibaba/druid/wiki

其它人博客：https://www.cnblogs.com/niejunlei/p/5977895.html

Spring Boot2.1.9：整合Druid 数据源与监控

查看监控视图

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