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如何使用java代碼獲取JVM信息

更新時(shí)間：2025年04月14日 09:00:53 作者：香吧香

這篇文章主要介紹了使用java代碼獲取JVM信息的相關(guān)操作代碼,代碼簡(jiǎn)單易懂,感興趣的朋友一起看看吧

轉(zhuǎn)載請(qǐng)注明出處：

最近在環(huán)境中定位服務(wù)問(wèn)題，由于服務(wù)使用的docker部署的，且使用的docker鏡像，在啟動(dòng)之后，容器內(nèi)沒(méi)有jdk相關(guān)的工具【jstat、jmap等等】；于是采用在項(xiàng)目中使用java類(lèi)獲取jvm相關(guān)信息，以下是測(cè)試的示例：

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) {  
        // 獲取內(nèi)存管理 bean  
        MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();  
        MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();  
        MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();  
        // 打印內(nèi)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");  
        // 獲取垃圾回收回收器 bean 的列表  
        List<GarbageCollectorMXBean> 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");  
        }  
        // 打印內(nèi)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());  
        }  
        // 獲取線程管理 bean  
        ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();  
        // 獲取所有線程 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());  
        }  
        // 檢查死鎖線程  
        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.");  
        }  
    }  
}

獲取GC信息
- 通過(guò)ManagementFactory.getGarbageCollectorMXBeans()獲取所有垃圾回收器的監(jiān)控Bean。
- 每個(gè)GarbageCollectorMXBean提供：
  - getName()：GC算法名稱(chēng)（如G1 Young Generation）
  - getCollectionCount()：回收次數(shù)
  - getCollectionTime()：累計(jì)耗時(shí)（毫秒）

2.打印當(dāng)前線程信息：

- 使用 ThreadMXBean 獲取當(dāng)前線程的所有 ID，并通過(guò) getThreadInfo 方法獲取每個(gè)線程的信息，包括線程名字和狀態(tài)。

3.檢查死鎖線程：

- 使用 findDeadlockedThreads 方法檢查 JVM 中的死鎖情況。如果有死鎖線程，則輸出這些線程的 ID 和名稱(chēng)。如果沒(méi)有，則輸出相應(yīng)的消息。

Heap Memory Usage:
  Init: 508 MB
  Used: 10 MB
  Committed: 487 MB
  Max: 7205 MB
Non-Heap Memory Usage:
  Init: 2 MB
  Used: 4 MB
  Committed: 7 MB
  Max: 0 MB
Garbage 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 ms
Memory 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: RUNNABLE
No deadlocked threads found.
Process finished with exit code 0

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