java 获取服务器内存

public class MemoryInfo {
    public static void main(String[] args) {
        Runtime runtime = Runtime.getRuntime();

        long totalMemory = runtime.totalMemory(); // 返回JVM总内存
        long freeMemory = runtime.freeMemory();   // 返回JVM空闲内存
        long usedMemory = totalMemory - freeMemory; // 计算已使用的内存

        System.out.println("Total Memory: " + totalMemory / (1024 * 1024) + " MB");
        System.out.println("Free Memory: " + freeMemory / (1024 * 1024) + " MB");
        System.out.println("Used Memory: " + usedMemory / (1024 * 1024) + " MB");
    }
}

import java.lang.management.ManagementFactory;
import java.lang.management.MemoryMXBean;
import java.lang.management.MemoryUsage;

public class MemoryInfoDetailed {
    public static void main(String[] args) {
        MemoryMXBean memoryBean = ManagementFactory.getMemoryMXBean();

        MemoryUsage heapMemoryUsage = memoryBean.getHeapMemoryUsage();
        MemoryUsage nonHeapMemoryUsage = memoryBean.getNonHeapMemoryUsage();

        System.out.println("Heap Memory Usage: " + heapMemoryUsage);
        System.out.println("Non-Heap Memory Usage: " + nonHeapMemoryUsage);
    }
}