java判断服务器内存

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

        // 获取JVM最大内存
        long maxMemory = runtime.maxMemory();
        System.out.println("Max Memory: " + maxMemory / 1024 / 1024 + " MB");

        // 获取JVM空闲内存
        long freeMemory = runtime.freeMemory();
        System.out.println("Free Memory: " + freeMemory / 1024 / 1024 + " MB");

        // 获取JVM总内存
        long totalMemory = runtime.totalMemory();
        System.out.println("Total Memory: " + totalMemory / 1024 / 1024 + " MB");

        // 获取操作系统总内存
        long osTotalMemory = getOsTotalMemory();
        System.out.println("OS Total Memory: " + osTotalMemory / 1024 / 1024 + " MB");

        // 获取操作系统可用内存
        long osFreeMemory = getOsFreeMemory();
        System.out.println("OS Free Memory: " + osFreeMemory / 1024 / 1024 + " MB");
    }

    private static long getOsTotalMemory() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader("/proc/meminfo"));
            String line = reader.readLine();
            if (line != null && line.startsWith("MemTotal:")) {
                return Long.parseLong(line.split("\\s+")[1]) * 1024;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return -1;
    }

    private static long getOsFreeMemory() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader("/proc/meminfo"));
            String line;
            while ((line = reader.readLine()) != null) {
                if (line.startsWith("MemFree:")) {
                    return Long.parseLong(line.split("\\s+")[1]) * 1024;
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return -1;
    }
}