写一个通过jmx获取服务器CPU，内存，磁盘，网络 的java工具类

好的，以下是一个通过JMX获取服务器CPU，内存，磁盘，网络信息的Java工具类的示例代码：

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.util.ArrayList;
import java.util.List;

import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;

public class ServerMonitoringUtil {

    private static final String OS_MXBEAN_NAME = "java.lang:type=OperatingSystem";
    private static final String MEMORY_MXBEAN_NAME = "java.lang:type=Memory";
    private static final String CLASS_LOADING_MXBEAN_NAME = "java.lang:type=ClassLoading";
    private static final String RUNTIME_MXBEAN_NAME = "java.lang:type=Runtime";
    private static final String THREAD_MXBEAN_NAME = "java.lang:type=Threading";
    private static final String GARABAGE_COLLECTOR_MXBEAN_NAME = "java.lang:type=GarbageCollector,*";
    private static final String NETWORK_INTERFACE_MXBEAN_NAME = "java.lang:type=OperatingSystem";

    private MBeanServerConnection mbsc;

    public ServerMonitoringUtil(MBeanServerConnection mbsc) {
        this.mbsc = mbsc;
    }

    public double getCpuUsage() throws AttributeNotFoundException, InstanceNotFoundException, MBeanException, ReflectionException {
        OperatingSystemMXBean osMxBean = ManagementFactory.newPlatformMXBeanProxy(mbsc, OS_MXBEAN_NAME, OperatingSystemMXBean.class);
        return osMxBean.getSystemCpuLoad();
    }

    public long getMemoryUsed() throws AttributeNotFoundException, InstanceNotFoundException, MBeanException, ReflectionException {
        ObjectName memoryMxBeanName = new ObjectName(MEMORY_MXBEAN_NAME);
        long used = (Long) mbsc.getAttribute(memoryMxBeanName, "HeapMemoryUsage.used");
        used += (Long) mbsc.getAttribute(memoryMxBeanName, "NonHeapMemoryUsage.used");
        return used;
    }

    public long getMemoryMax() throws AttributeNotFoundException, InstanceNotFoundException, MBeanException, ReflectionException {
        ObjectName memoryMxBeanName = new ObjectName(MEMORY_MXBEAN_NAME);
        long max = (Long) mbsc.getAttribute(memoryMxBeanName, "HeapMemoryUsage.max");
        max += (Long) mbsc.getAttribute(memoryMxBeanName, "NonHeapMemoryUsage.max");
        return max;
    }

    public double getClassLoadingRate() throws AttributeNotFoundException, InstanceNotFoundException, MBeanException, ReflectionException {
        ObjectName classLoadingMxBeanName = new ObjectName(CLASS_LOADING_MXBEAN_NAME);
        long loadedCount = (Long) mbsc.getAttribute(classLoadingMxBeanName, "LoadedClassCount");
        long totalLoadedCount = (Long) mbsc.getAttribute(classLoadingMxBeanName, "TotalLoadedClassCount");
        long unloadedCount = (Long) mbsc.getAttribute(classLoadingMxBeanName, "UnloadedClassCount");
        return (double) loadedCount / totalLoadedCount;
    }

    public long getThreadCount() throws AttributeNotFoundException, InstanceNotFoundException, MBeanException, ReflectionException {
        ObjectName threadMxBeanName = new ObjectName(THREAD_MXBEAN_NAME);
        return (Long) mbsc.getAttribute(threadMxBeanName, "ThreadCount");
    }

    public long getGarbageCollectionTime() throws MalformedObjectNameException, AttributeNotFoundException, InstanceNotFoundException, MBeanException, ReflectionException {
        long gcTime = 0;
        List<ObjectName> gcMxBeanNames = new ArrayList<ObjectName>();
        gcMxBeanNames.addAll(mbsc.queryNames(new ObjectName(GARABAGE_COLLECTOR_MXBEAN_NAME), null));
        for (ObjectName gcMxBeanName : gcMxBeanNames) {
            gcTime += (Long) mbsc.getAttribute(gcMxBeanName, "CollectionTime");
        }
        return gcTime;
    }

    public long getDiskUsed() {
        // TODO: Implement disk usage monitoring
        return 0;
    }

    public long getNetworkInboundBytes() {
        // TODO: Implement network inbound bytes monitoring
        return 0;
    }

    public long getNetworkOutboundBytes() {
        // TODO: Implement network outbound bytes monitoring
        return 0;
    }

}

该工具类实现了获取CPU使用率、内存使用情况、类加载速率、线程数、垃圾回收时间等信息的方法，同时也提供了获取磁盘使用情况、网络流量等信息的桩函数，需要根据实际情况进行实现。在使用该工具类时，需要传入一个已经连接到目标服务器的MBeanServerConnection对象。