通过 JMX 取 redis 客户端连接池信息

可以通过JMX获取Redis客户端连接池信息，具体步骤如下：

1.启动Redis服务，并在redis.conf文件中添加如下配置：

# 开启JMX监控
jmx-enabled yes
# JMX监控端口
jmx-port 9999
# JMX监控认证密码
requirepass yourpassword

2.在Java代码中连接Redis，并通过JMX获取连接池信息，示例代码如下：

import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.util.HashMap;
import java.util.Map;

public class RedisJmxClient {
    public static void main(String[] args) throws Exception {
        // 连接JMX
        String jmxUrl = "service:jmx:rmi:///jndi/rmi://localhost:9999/jmxrmi";
        Map<String, Object> env = new HashMap<>();
        env.put(JMXConnector.CREDENTIALS, new String[]{"admin", "yourpassword"});
        JMXConnector connector = JMXConnectorFactory.connect(new JMXServiceURL(jmxUrl), env);
        MBeanServerConnection mbsc = connector.getMBeanServerConnection();

        // 获取连接池信息
        ObjectName poolName = new ObjectName("redis.clients.jedis.JedisPool:name=pool");
        int active = (int) mbsc.getAttribute(poolName, "NumActive");
        int idle = (int) mbsc.getAttribute(poolName, "NumIdle");
        int waiters = (int) mbsc.getAttribute(poolName, "NumWaiters");
        System.out.println("Active connections: " + active);        System.out.println("Idle connections: " + idle);
        System.out.println("Waiting threads: " + waiters);

        // 关闭JMX连接
        connector.close();
    }
}

该代码通过JMX连接到Redis服务，获取连接池的活跃连接数、空闲连接数和等待线程数等信息，并输出到控制台。