使用java代码获取JVM信息

编程知识1132025-04-13评论

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　　最近在环境中定位服务问题，由于服务使用的docker部署的，且使用的docker镜像，在启动之后，容器内没有jdk相关的工具【jstat、jmap等等】；于是采用在项目中使用java类获取jvm相关信息，以下是测试的示例：

import java.lang.management.ManagementFactory;  
import java.lang.management.MemoryMXBean;  
import java.lang.management.MemoryUsage;  
import java.lang.management.GarbageCollectorMXBean;  
import java.lang.management.MemoryPoolMXBean;  
import java.lang.management.ThreadMXBean;  

import java.util.List;  

public class GCInfoDemo {  
    public static void main(String[] args) {  
        // 获取内存管理 bean  
        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();  
        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();  
        MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();  

        // 打印内存信息  
        System.out.println("Heap Memory Usage:");  
        System.out.println("  Init: " + heapMemoryUsage.getInit() / (1024 * 1024) + " MB");  
        System.out.println("  Used: " + heapMemoryUsage.getUsed() / (1024 * 1024) + " MB");  
        System.out.println("  Committed: " + heapMemoryUsage.getCommitted() / (1024 * 1024) + " MB");  
        System.out.println("  Max: " + heapMemoryUsage.getMax() / (1024 * 1024) + " MB");  
        
        System.out.println("\nNon-Heap Memory Usage:");  
        System.out.println("  Init: " + nonHeapMemoryUsage.getInit() / (1024 * 1024) + " MB");  
        System.out.println("  Used: " + nonHeapMemoryUsage.getUsed() / (1024 * 1024) + " MB");  
        System.out.println("  Committed: " + nonHeapMemoryUsage.getCommitted() / (1024 * 1024) + " MB");  
        System.out.println("  Max: " + nonHeapMemoryUsage.getMax() / (1024 * 1024) + " MB");  

        // 获取垃圾回收回收器 bean 的列表  
        List gcBeans = ManagementFactory.getGarbageCollectorMXBeans();  
        System.out.println("\nGarbage Collectors:");  
        for (GarbageCollectorMXBean gcBean : gcBeans) {  
            System.out.println("  Name: " + gcBean.getName());  
            System.out.println("  Number of collections: " + gcBean.getCollectionCount());  
            System.out.println("  Total time spent in collections: " + gcBean.getCollectionTime() + " ms");  
        }  

        // 打印内存池信息  
        System.out.println("\nMemory Pools:");  
        for (MemoryPoolMXBean memoryPool : ManagementFactory.getMemoryPoolMXBeans()) {  
            System.out.println("  Name: " + memoryPool.getName());  
            System.out.println("  Usage: " + memoryPool.getUsage());  
        }  

        // 获取线程管理 bean  
        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();  
        
        // 获取所有线程 ID  
        long[] threadIds = threadMXBean.getAllThreadIds();  
        System.out.println("\nThreads Information:");  
        for (long threadId : threadIds) {  
            System.out.println("  Thread ID: " + threadId);  
            System.out.println("  Thread Name: " + threadMXBean.getThreadInfo(threadId).getThreadName());  
            System.out.println("  Thread State: " + threadMXBean.getThreadInfo(threadId).getThreadState());  
        }  

        // 检查死锁线程  
        long[] deadlockedThreads = threadMXBean.findDeadlockedThreads();  
        if (deadlockedThreads != null) {  
            System.out.println("\nDeadlocked Threads:");  
            for (long deadlockedThreadId : deadlockedThreads) {  
                System.out.println("  Deadlocked Thread ID: " + deadlockedThreadId);  
                System.out.println("  Thread Name: " + threadMXBean.getThreadInfo(deadlockedThreadId).getThreadName());  
            }  
        } else {  
            System.out.println("\nNo deadlocked threads found.");  
        }  
    }  
}

获取GC信息
- 通过ManagementFactory.getGarbageCollectorMXBeans()获取所有垃圾回收器的监控Bean。
- 每个GarbageCollectorMXBean提供：
  - getName()：GC算法名称（如G1 Young Generation）
  - getCollectionCount()：回收次数
  - getCollectionTime()：累计耗时（毫秒）

　　 2.打印当前线程信息：

- 使用 ThreadMXBean 获取当前线程的所有 ID，并通过 getThreadInfo 方法获取每个线程的信息，包括线程名字和状态。

　　 3.检查死锁线程：

- 使用 findDeadlockedThreads 方法检查 JVM 中的死锁情况。如果有死锁线程，则输出这些线程的 ID 和名称。如果没有，则输出相应的消息。

Heap Memory Usage: Init: 508 MB Used: 10 MB Committed: 487 MB Max: 7205MBNon-Heap Memory Usage: Init: 2 MB Used: 4 MB Committed: 7 MB Max: 0 MBGarbage Collectors: Name: PS Scavenge Number of collections: 0 Total time spent in collections: 0 ms Name: PS MarkSweep Number of collections: 0 Total time spent in collections: 0 msMemory Pools: Name: Code Cache Usage: init = 2555904(2496K) used = 1235968(1207K) committed = 2555904(2496K) max = 251658240(245760K) Name: Metaspace Usage: init = 0(0K) used = 3597432(3513K) committed = 4980736(4864K) max = -1(-1K) Name: Compressed Class Space Usage: init = 0(0K) used = 392584(383K) committed = 524288(512K) max = 1073741824(1048576K) Name: PS Eden Space Usage: init = 133169152(130048K) used = 10914704(10658K) committed = 133169152(130048K) max = 2789212160(2723840K) Name: PS Survivor Space Usage: init = 22020096(21504K) used = 0(0K) committed = 22020096(21504K) max = 22020096(21504K) Name: PS Old Gen Usage: init = 355467264(347136K) used = 0(0K) committed = 355467264(347136K) max = 5666504704(5533696K)Threads Information: Thread ID: 6 Thread Name: Monitor Ctrl-Break Thread State: RUNNABLE Thread ID: 5 Thread Name: Attach Listener Thread State: RUNNABLE Thread ID: 4 Thread Name: Signal Dispatcher Thread State: RUNNABLE Thread ID: 3 Thread Name: Finalizer Thread State: WAITING Thread ID: 2 Thread Name: Reference Handler Thread State: WAITING Thread ID: 1 Thread Name: main Thread State: RUNNABLENo deadlocked threads found.Process finished with exit code 0

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使用java代码获取JVM信息

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