Spring boot 集成 Druid 数据源

Druid是阿里开源的一个JDBC应用组件，其中包括三部分：

• 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：实用SQL语法分析

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

依赖

pom.xml

• Druid Spring Boot Starter是阿里官方提供的Spring Boot插件，用于在Spring Boot项目中集成Druid数据库连接池和监控

<!-- druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.9</version>
</dependency>
<!-- log4j -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

配置

application.yml

server:
  port: 8001

spring:
  datasource:
    name: druidDataSource
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/coisini?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8&serverTimezone=GMT%2B8
      username: root
      password: sunday
      filters: stat,wall,log4j,config
      max-active: 100
      initial-size: 1
      max-wait: 60000
      min-idle: 1
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 300000
      validation-query: select 'x'
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      pool-prepared-statements: true
      max-open-prepared-statements: 50
      max-pool-prepared-statement-per-connection-size: 20

DruidDataSourceProperties.class

• 配置类对Druid进行自定义属性配置

@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;
	}
}

• Druid Spring Starter简化了很多配置，如果默认配置不满足你的需求，可以自定义配置，参考文档：https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter

配置Servlet和Filter

DruidConfig.class

• @EnableConfigurationProperties：用于导入Druid的配置信息

@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", "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
     * @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;
    }
}

resources目录下添加log4j参数配置文件

### set log levels ###
log4j.rootLogger = INFO,DEBUG, console, infoFile, errorFile ,debugfile,mail
LocationInfo=true    

log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.layout = org.apache.log4j.PatternLayout 

log4j.appender.console.layout.ConversionPattern =[%d{yyyy-MM-dd HH:mm:ss,SSS}]-[%p]:%m   %x %n 

log4j.appender.infoFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.infoFile.Threshold = INFO
log4j.appender.infoFile.File = C:/logs/log
log4j.appender.infoFile.DatePattern = '.'yyyy-MM-dd'.log'
log4j.appender.infoFile.Append=true
log4j.appender.infoFile.layout = org.apache.log4j.PatternLayout
log4j.appender.infoFile.layout.ConversionPattern =[%d{yyyy-MM-dd HH:mm:ss,SSS}]-[%p]:%m  %x %n 

log4j.appender.errorFile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.errorFile.Threshold = ERROR
log4j.appender.errorFile.File = C:/logs/error
log4j.appender.errorFile.DatePattern = '.'yyyy-MM-dd'.log'
log4j.appender.errorFile.Append=true
log4j.appender.errorFile.layout = org.apache.log4j.PatternLayout
log4j.appender.errorFile.layout.ConversionPattern =[%d{yyyy-MM-dd HH:mm:ss,SSS}]-[%p]:%m  %x %n

log4j.appender.debugfile = org.apache.log4j.DailyRollingFileAppender
log4j.appender.debugfile.Threshold = DEBUG
log4j.appender.debugfile.File = C:/logs/debug
log4j.appender.debugfile.DatePattern = '.'yyyy-MM-dd'.log'
log4j.appender.debugfile.Append=true
log4j.appender.debugfile.layout = org.apache.log4j.PatternLayout
log4j.appender.debugfile.layout.ConversionPattern =[%d{yyyy-MM-dd HH:mm:ss,SSS}]-[%p]:%m  %x %n

编译运行

• 启动应用，访问http://localhost:8001/druid/login.html，如下：
  
  
• 用户名与密码为DriudConfig中配置的登录账号和密码：admin/admin