使用java代码获取JVM信息

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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：

1. import java.lang.management.ManagementFactory;  
2. import java.lang.management.MemoryMXBean;  
3. import java.lang.management.MemoryUsage;  
4. import java.lang.management.GarbageCollectorMXBean;  
5. import java.lang.management.MemoryPoolMXBean;  
6. import java.lang.management.ThreadMXBean;  
8. import java.util.List;  
10. public class GCInfoDemo {  
11.     public static void main(String[] args) {  
12.         // 获取内存管理 bean  
13.         MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();  
14.         MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();  
15.         MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();  
17.         // 打印内存信息  
18.         System.out.println("Heap Memory Usage:");  
19.         System.out.println("  Init: " + heapMemoryUsage.getInit() / (1024 * 1024) + " MB");  
20.         System.out.println("  Used: " + heapMemoryUsage.getUsed() / (1024 * 1024) + " MB");  
21.         System.out.println("  Committed: " + heapMemoryUsage.getCommitted() / (1024 * 1024) + " MB");  
22.         System.out.println("  Max: " + heapMemoryUsage.getMax() / (1024 * 1024) + " MB");  
23.         
24.         System.out.println("\nNon-Heap Memory Usage:");  
25.         System.out.println("  Init: " + nonHeapMemoryUsage.getInit() / (1024 * 1024) + " MB");  
26.         System.out.println("  Used: " + nonHeapMemoryUsage.getUsed() / (1024 * 1024) + " MB");  
27.         System.out.println("  Committed: " + nonHeapMemoryUsage.getCommitted() / (1024 * 1024) + " MB");  
28.         System.out.println("  Max: " + nonHeapMemoryUsage.getMax() / (1024 * 1024) + " MB");  
30.         // 获取垃圾回收回收器 bean 的列表  
31.         List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();  
32.         System.out.println("\nGarbage Collectors:");  
33.         for (GarbageCollectorMXBean gcBean : gcBeans) {  
34.             System.out.println("  Name: " + gcBean.getName());  
35.             System.out.println("  Number of collections: " + gcBean.getCollectionCount());  
36.             System.out.println("  Total time spent in collections: " + gcBean.getCollectionTime() + " ms");  
37.         }  
39.         // 打印内存池信息  
40.         System.out.println("\nMemory Pools:");  
41.         for (MemoryPoolMXBean memoryPool : ManagementFactory.getMemoryPoolMXBeans()) {  
42.             System.out.println("  Name: " + memoryPool.getName());  
43.             System.out.println("  Usage: " + memoryPool.getUsage());  
44.         }  
46.         // 获取线程管理 bean  
47.         ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();  
48.         
49.         // 获取所有线程 ID  
50.         long[] threadIds = threadMXBean.getAllThreadIds();  
51.         System.out.println("\nThreads Information:");  
52.         for (long threadId : threadIds) {  
53.             System.out.println("  Thread ID: " + threadId);  
54.             System.out.println("  Thread Name: " + threadMXBean.getThreadInfo(threadId).getThreadName());  
55.             System.out.println("  Thread State: " + threadMXBean.getThreadInfo(threadId).getThreadState());  
56.         }  
58.         // 检查死锁线程  
59.         long[] deadlockedThreads = threadMXBean.findDeadlockedThreads();  
60.         if (deadlockedThreads != null) {  
61.             System.out.println("\nDeadlocked Threads:");  
62.             for (long deadlockedThreadId : deadlockedThreads) {  
63.                 System.out.println("  Deadlocked Thread ID: " + deadlockedThreadId);  
64.                 System.out.println("  Thread Name: " + threadMXBean.getThreadInfo(deadlockedThreadId).getThreadName());  
65.             }  
66.         } else {  
67.             System.out.println("\nNo deadlocked threads found.");  
68.         }  
69.     }  
70. }  

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• 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。
    
  
  

1. Heap Memory Usage:
2.   Init: 508 MB
3.   Used: 10 MB
4.   Committed: 487 MB
5.   Max: 7205 MB
7. Non-Heap Memory Usage:
8.   Init: 2 MB
9.   Used: 4 MB
10.   Committed: 7 MB
11.   Max: 0 MB
13. Garbage Collectors:
14.   Name: PS Scavenge
15.   Number of collections: 0
16.   Total time spent in collections: 0 ms
17.   Name: PS MarkSweep
18.   Number of collections: 0
19.   Total time spent in collections: 0 ms
21. Memory Pools:
22.   Name: Code Cache
23.   Usage: init = 2555904(2496K) used = 1235968(1207K) committed = 2555904(2496K) max = 251658240(245760K)
24.   Name: Metaspace
25.   Usage: init = 0(0K) used = 3597432(3513K) committed = 4980736(4864K) max = -1(-1K)
26.   Name: Compressed Class Space
27.   Usage: init = 0(0K) used = 392584(383K) committed = 524288(512K) max = 1073741824(1048576K)
28.   Name: PS Eden Space
29.   Usage: init = 133169152(130048K) used = 10914704(10658K) committed = 133169152(130048K) max = 2789212160(2723840K)
30.   Name: PS Survivor Space
31.   Usage: init = 22020096(21504K) used = 0(0K) committed = 22020096(21504K) max = 22020096(21504K)
32.   Name: PS Old Gen
33.   Usage: init = 355467264(347136K) used = 0(0K) committed = 355467264(347136K) max = 5666504704(5533696K)
35. Threads Information:
36.   Thread ID: 6
37.   Thread Name: Monitor Ctrl-Break
38.   Thread State: RUNNABLE
39.   Thread ID: 5
40.   Thread Name: Attach Listener
41.   Thread State: RUNNABLE
42.   Thread ID: 4
43.   Thread Name: Signal Dispatcher
44.   Thread State: RUNNABLE
45.   Thread ID: 3
46.   Thread Name: Finalizer
47.   Thread State: WAITING
48.   Thread ID: 2
49.   Thread Name: Reference Handler
50.   Thread State: WAITING
51.   Thread ID: 1
52.   Thread Name: main
53.   Thread State: RUNNABLE
55. No deadlocked threads found.
57. Process finished with exit code 0

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