Druid Spring Boot Starter实现监控

快来打我* 2022-04-05 03:08 254阅读 0赞

1.  在 Spring Boot 项目中加入`druid-spring-boot-starter`依赖
    
        Maven
        
        <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid-spring-boot-starter</artifactId>
           <version>1.1.10</version>
        </dependency>
        Gradle
        
        compile 'com.alibaba:druid-spring-boot-starter:1.1.10'
2.  添加配置
    
        spring.datasource.url= 
        spring.datasource.username=
        spring.datasource.password=
        # ...其他配置（可选，不是必须的，使用内嵌数据库的话上述三项也可省略不填）

## 配置属性 ##

Druid Spring Boot Starter 配置属性的名称完全遵照 Druid，你可以通过 Spring Boot 配置文件来配置Druid数据库连接池和监控，如果没有配置则使用默认值。

*  JDBC 配置

spring.datasource.druid.url= # 或spring.datasource.url= 
    spring.datasource.druid.username= # 或spring.datasource.username=
    spring.datasource.druid.password= # 或spring.datasource.password=
    spring.datasource.druid.driver-class-name= #或 spring.datasource.driver-class-name=

*  连接池配置

spring.datasource.druid.initial-size=
    spring.datasource.druid.max-active=
    spring.datasource.druid.min-idle=
    spring.datasource.druid.max-wait=
    spring.datasource.druid.pool-prepared-statements=
    spring.datasource.druid.max-pool-prepared-statement-per-connection-size= 
    spring.datasource.druid.max-open-prepared-statements= #和上面的等价
    spring.datasource.druid.validation-query=
    spring.datasource.druid.validation-query-timeout=
    spring.datasource.druid.test-on-borrow=
    spring.datasource.druid.test-on-return=
    spring.datasource.druid.test-while-idle=
    spring.datasource.druid.time-between-eviction-runs-millis=
    spring.datasource.druid.min-evictable-idle-time-millis=
    spring.datasource.druid.max-evictable-idle-time-millis=
    spring.datasource.druid.filters= #配置多个英文逗号分隔
    ....//more

*  监控配置

# WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
    spring.datasource.druid.web-stat-filter.enabled= #是否启用StatFilter默认值true
    spring.datasource.druid.web-stat-filter.url-pattern=
    spring.datasource.druid.web-stat-filter.exclusions=
    spring.datasource.druid.web-stat-filter.session-stat-enable=
    spring.datasource.druid.web-stat-filter.session-stat-max-count=
    spring.datasource.druid.web-stat-filter.principal-session-name=
    spring.datasource.druid.web-stat-filter.principal-cookie-name=
    spring.datasource.druid.web-stat-filter.profile-enable=
    
    # StatViewServlet配置，说明请参考Druid Wiki，配置_StatViewServlet配置
    spring.datasource.druid.stat-view-servlet.enabled= #是否启用StatViewServlet默认值true
    spring.datasource.druid.stat-view-servlet.url-pattern=
    spring.datasource.druid.stat-view-servlet.reset-enable=
    spring.datasource.druid.stat-view-servlet.login-username=
    spring.datasource.druid.stat-view-servlet.login-password=
    spring.datasource.druid.stat-view-servlet.allow=
    spring.datasource.druid.stat-view-servlet.deny=
    
    # Spring监控配置，说明请参考Druid Github Wiki，配置_Druid和Spring关联监控配置
    spring.datasource.druid.aop-patterns= # Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔

Druid Spring Boot Starter 不仅限于对以上配置属性提供支持，[`DruidDataSource`][DruidDataSource] 内提供`setter`方法的可配置属性都将被支持。你可以参考WIKI文档或通过IDE输入提示来进行配置。配置文件的格式你可以选择`.properties`或`.yml`，效果是一样的，在配置较多的情况下推荐使用`.yml`。

## 如何配置多数据源 ##

1.  添加配置

spring.datasource.url=
    spring.datasource.username=
    spring.datasource.password=
    
    # Druid 数据源配置，继承spring.datasource.* 配置，相同则覆盖
    ...
    spring.datasource.druid.initial-size=5
    spring.datasource.druid.max-active=5
    ...
    
    # Druid 数据源 1 配置，继承spring.datasource.druid.* 配置，相同则覆盖
    ...
    spring.datasource.druid.one.max-active=10
    spring.datasource.druid.one.max-wait=10000
    ...
    
    # Druid 数据源 2 配置，继承spring.datasource.druid.* 配置，相同则覆盖
    ...
    spring.datasource.druid.two.max-active=20
    spring.datasource.druid.two.max-wait=20000
    ...

**强烈注意**：Spring Boot 2.X 版本不再支持配置继承，多数据源的话每个数据源的所有配置都需要单独配置，否则配置不会生效

1.  创建数据源

@Primary
    @Bean
    @ConfigurationProperties("spring.datasource.druid.one")
    public DataSource dataSourceOne(){
        return DruidDataSourceBuilder.create().build();
    }
    @Bean
    @ConfigurationProperties("spring.datasource.druid.two")
    public DataSource dataSourceTwo(){
        return DruidDataSourceBuilder.create().build();
    }

## 如何配置 Filter ##

你可以通过 `spring.datasource.druid.filters=stat,wall,log4j ...` 的方式来启用相应的内置Filter，不过这些Filter都是默认配置。如果默认配置不能满足你的需求，你可以放弃这种方式，通过配置文件来配置Filter，下面是例子。

# 配置StatFilter 
    spring.datasource.druid.filter.stat.db-type=h2
    spring.datasource.druid.filter.stat.log-slow-sql=true
    spring.datasource.druid.filter.stat.slow-sql-millis=2000
    
    # 配置WallFilter 
    spring.datasource.druid.filter.wall.enabled=true
    spring.datasource.druid.filter.wall.db-type=h2
    spring.datasource.druid.filter.wall.config.delete-allow=false
    spring.datasource.druid.filter.wall.config.drop-table-allow=false
    
    # 其他 Filter 配置不再演示

目前为以下 Filter 提供了配置支持，请参考文档或者根据IDE提示（`spring.datasource.druid.filter.*`）进行配置。

*  StatFilter
 *  WallFilter
 *  ConfigFilter
 *  EncodingConvertFilter
 *  Slf4jLogFilter
 *  Log4jFilter
 *  Log4j2Filter
 *  CommonsLogFilter

要想使自定义 Filter 配置生效需要将对应 Filter 的 `enabled` 设置为 `true` ，Druid Spring Boot Starter 默认会启用 StatFilter，你也可以将其 `enabled` 设置为 `false` 来禁用它。

## 如何获取 Druid 的监控数据 ##

Druid 的监控数据可以通过 DruidStatManagerFacade 进行获取，获取到监控数据之后你可以将其暴露给你的监控系统进行使用。Druid 默认的监控系统数据也来源于此。下面给做一个简单的演示，在 Spring Boot 中如何通过 HTTP 接口将 Druid 监控数据以 JSON 的形式暴露出去，实际使用中你可以根据你的需要自由地对监控数据、暴露方式进行扩展。

@RestController
    public class DruidStatController {
        @GetMapping("/druid/stat")
        public Object druidStat(){
            // DruidStatManagerFacade#getDataSourceStatDataList 该方法可以获取所有数据源的监控数据，除此之外 DruidStatManagerFacade 还提供了一些其他方法，你可以按需选择使用。
            return DruidStatManagerFacade.getInstance().getDataSourceStatDataList();
        }
    }
    [
      {
        "Identity": 1583082378,
        "Name": "DataSource-1583082378",
        "DbType": "h2",
        "DriverClassName": "org.h2.Driver",
        "URL": "jdbc:h2:file:./demo-db",
        "UserName": "sa",
        "FilterClassNames": [
          "com.alibaba.druid.filter.stat.StatFilter"
        ],
        "WaitThreadCount": 0,
        "NotEmptyWaitCount": 0,
        "NotEmptyWaitMillis": 0,
        "PoolingCount": 2,
        "PoolingPeak": 2,
        "PoolingPeakTime": 1533782955104,
        "ActiveCount": 0,
        "ActivePeak": 1,
        "ActivePeakTime": 1533782955178,
        "InitialSize": 2,
        "MinIdle": 2,
        "MaxActive": 30,
        "QueryTimeout": 0,
        "TransactionQueryTimeout": 0,
        "LoginTimeout": 0,
        "ValidConnectionCheckerClassName": null,
        "ExceptionSorterClassName": null,
        "TestOnBorrow": true,
        "TestOnReturn": true,
        "TestWhileIdle": true,
        "DefaultAutoCommit": true,
        "DefaultReadOnly": null,
        "DefaultTransactionIsolation": null,
        "LogicConnectCount": 103,
        "LogicCloseCount": 103,
        "LogicConnectErrorCount": 0,
        "PhysicalConnectCount": 2,
        "PhysicalCloseCount": 0,
        "PhysicalConnectErrorCount": 0,
        "ExecuteCount": 102,
        "ErrorCount": 0,
        "CommitCount": 100,
        "RollbackCount": 0,
        "PSCacheAccessCount": 100,
        "PSCacheHitCount": 99,
        "PSCacheMissCount": 1,
        "StartTransactionCount": 100,
        "TransactionHistogram": [
          55,
          44,
          1,
          0,
          0,
          0,
          0
        ],
        "ConnectionHoldTimeHistogram": [
          53,
          47,
          3,
          0,
          0,
          0,
          0,
          0
        ],
        "RemoveAbandoned": false,
        "ClobOpenCount": 0,
        "BlobOpenCount": 0,
        "KeepAliveCheckCount": 0,
        "KeepAlive": false,
        "FailFast": false,
        "MaxWait": 1234,
        "MaxWaitThreadCount": -1,
        "PoolPreparedStatements": true,
        "MaxPoolPreparedStatementPerConnectionSize": 5,
        "MinEvictableIdleTimeMillis": 30001,
        "MaxEvictableIdleTimeMillis": 25200000,
        "LogDifferentThread": true,
        "RecycleErrorCount": 0,
        "PreparedStatementOpenCount": 1,
        "PreparedStatementClosedCount": 0,
        "UseUnfairLock": true,
        "InitGlobalVariants": false,
        "InitVariants": false
      }
    ]

## IDE 提示支持 ##

[![druid-spring-boot-starter-ide-hint.jpg][]][druid-spring-boot-starter-ide-hint.jpg]

## 演示 ##

克隆项目，运行`test`包内的`DemoApplication`。

参考文章：[https://github.com/alibaba/druid/blob/master/druid-spring-boot-starter/README.md][https_github.com_alibaba_druid_blob_master_druid-spring-boot-starter_README.md]

[DruidDataSource]: https://github.com/alibaba/druid/blob/master/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
[druid-spring-boot-starter-ide-hint.jpg]: /images/20220405/0f7ba41227e941b68f5cd898d146eae8.png
[https_github.com_alibaba_druid_blob_master_druid-spring-boot-starter_README.md]: https://github.com/alibaba/druid/blob/master/druid-spring-boot-starter/README.md