如何在 Java 中检查 CPU 和内存使用情况? [英] How do I check CPU and Memory Usage in Java?

问题描述

我需要用java检查服务器的CPU和内存使用情况，有人知道怎么做吗?

I need to check CPU and memory usage for the server in java, anyone know how it could be done?

推荐答案

如果您专门寻找 JVM 中的内存:

If you are looking specifically for memory in JVM:

Runtime runtime = Runtime.getRuntime();

NumberFormat format = NumberFormat.getInstance();

StringBuilder sb = new StringBuilder();
long maxMemory = runtime.maxMemory();
long allocatedMemory = runtime.totalMemory();
long freeMemory = runtime.freeMemory();

sb.append("free memory: " + format.format(freeMemory / 1024) + "<br/>");
sb.append("allocated memory: " + format.format(allocatedMemory / 1024) + "<br/>");
sb.append("max memory: " + format.format(maxMemory / 1024) + "<br/>");
sb.append("total free memory: " + format.format((freeMemory + (maxMemory - allocatedMemory)) / 1024) + "<br/>");

然而，这些只能作为估计......

However, these should be taken only as an estimate...

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