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Spring boot 集成 Druid 数据源过程详解

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Druid是阿里开源的一个JDBC应用组件，其中包括三部分：

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

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