Hikari是Spring Boot默認(rèn)的數(shù)據(jù)庫(kù)連接池。區(qū)別于C3P0直接通過(guò)連接池對(duì)象獲取各項(xiàng)狀態(tài)指標(biāo)，Hikari需要通過(guò)JMX來(lái)獲取。Demo如下，采用Spring Boot集成，定時(shí)采集連接狀態(tài)。

public static void main(String[] args) throws SQLException, MalformedObjectNameException, InterruptedException {
 SpringApplication.run(HikariTest.class, args);
 HikariDataSource hikaridatasource = new HikariDataSource();
 hikaridatasource.setJdbcUrl("jdbc:mysql://localhost:3306?serverTimezone=GMT");
 hikaridatasource.setUsername("root");
 hikaridatasource.setPassword("");
 hikaridatasource.setDriverClassName("com.mysql.cj.jdbc.Driver");
 hikaridatasource.setRegisterMbeans(true);
 hikaridatasource.setPoolName("HikariConnectionPool");
 MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
 ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");
 poolProxy = JMX.newMXBeanProxy(mBeanServer, poolName, HikariPoolMXBean.class);
 Connection conn = hikaridatasource.getConnection();
 Statement sm = conn.createStatement();
 ResultSet rs = null;
 for (int i = 0; i < 999999999; i++) {
  rs = sm.executeQuery("select name from test.t1");
 }
 rs.close();
 sm.close();
 conn.close();
 hikaridatasource.close();
}

@Scheduled(fixedRate = 1000)
public void HikariMonitor() {
 if(poolProxy == null) {
  log.info("Hikari not initialized,please wait...");
 }else {
  log.info("HikariPoolState = "
  + "Active=[" + String.valueOf(poolProxy.getActiveConnections() + "] "
  + "Idle=[" + String.valueOf(poolProxy.getIdleConnections() + "] "
  + "Wait=["+poolProxy.getThreadsAwaitingConnection()+"] "
  + "Total=["+poolProxy.getTotalConnections()+"]")));
 } 
}

另外，在github有提到這樣的issue：

ObjectName poolName = new ObjectName("com.zaxxer.hikari:type=Pool (" + hikaridatasource.getPoolName() + ")");

可能會(huì)拋錯(cuò)

22:06:23.231 [main] DEBUG com.zaxxer.hikari.HikariConfig - Driver class com.mysql.cj.jdbc.Driver found in Thread context class loader sun.misc.Launcher$AppClassLoader@73d16e93
Exception in thread "main" java.lang.reflect.UndeclaredThrowableException
 at com.sun.proxy.$Proxy2.getIdleConnections(Unknown Source)
 at com.zte.hikariTest.HikariTest.main(HikariTest.java:32)
Caused by: javax.management.InstanceNotFoundException: com.zaxxer.hikari:type=Pool (foo)
 at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(Unknown Source)
 at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(Unknown Source)
 at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(Unknown Source)
 at com.sun.jmx.mbeanserver.MXBeanProxy$GetHandler.invoke(Unknown Source)
 at com.sun.jmx.mbeanserver.MXBeanProxy.invoke(Unknown Source)
 at javax.management.MBeanServerInvocationHandler.invoke(Unknown Source)
 ... 2 more

這是因?yàn)镠ikari設(shè)置參數(shù)同樣支持setHikariConfig和配置文件兩種配置方式，請(qǐng)選擇其中一種進(jìn)行配置，而不是二者一起使用。并且請(qǐng)配置屬性如下，否則 JMX 無(wú)法生效。

hikaridatasource.setRegisterMbeans(true);

代碼效果如下所示

2019-03-09 02:05:04.738 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:05.740 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:06.732 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait=[0] Total=[10]
2019-03-09 02:05:07.738 INFO com.zte.hikariTest.HikariTest.69 -HikariPoolState = Active=[1] Idle=[9] Wait=[0] Total=[10]

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