如何在Java中检查CPU和内存使用情况？

java operating-system ram cpu

2022-08-31 09:47:12

我需要检查java中服务器的CPU和内存使用情况，有人知道该怎么做吗？

答案 1

如果您专门在 JVM 中查找内存：

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/>");

但是，这些应仅作为估计...

答案 2

import java.io.File;
import java.text.NumberFormat;

public class SystemInfo {

    private Runtime runtime = Runtime.getRuntime();

    public String info() {
        StringBuilder sb = new StringBuilder();
        sb.append(this.osInfo());
        sb.append(this.memInfo());
        sb.append(this.diskInfo());
        return sb.toString();
    }

    public String osName() {
        return System.getProperty("os.name");
    }

    public String osVersion() {
        return System.getProperty("os.version");
    }

    public String osArch() {
        return System.getProperty("os.arch");
    }

    public long totalMem() {
        return Runtime.getRuntime().totalMemory();
    }

    public long usedMem() {
        return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
    }

    public String memInfo() {
        NumberFormat format = NumberFormat.getInstance();
        StringBuilder sb = new StringBuilder();
        long maxMemory = runtime.maxMemory();
        long allocatedMemory = runtime.totalMemory();
        long freeMemory = runtime.freeMemory();
        sb.append("Free memory: ");
        sb.append(format.format(freeMemory / 1024));
        sb.append("<br/>");
        sb.append("Allocated memory: ");
        sb.append(format.format(allocatedMemory / 1024));
        sb.append("<br/>");
        sb.append("Max memory: ");
        sb.append(format.format(maxMemory / 1024));
        sb.append("<br/>");
        sb.append("Total free memory: ");
        sb.append(format.format((freeMemory + (maxMemory - allocatedMemory)) / 1024));
        sb.append("<br/>");
        return sb.toString();

    }

    public String osInfo() {
        StringBuilder sb = new StringBuilder();
        sb.append("OS: ");
        sb.append(this.osName());
        sb.append("<br/>");
        sb.append("Version: ");
        sb.append(this.osVersion());
        sb.append("<br/>");
        sb.append(": ");
        sb.append(this.osArch());
        sb.append("<br/>");
        sb.append("Available processors (cores): ");
        sb.append(runtime.availableProcessors());
        sb.append("<br/>");
        return sb.toString();
    }

    public String diskInfo() {
        /* Get a list of all filesystem roots on this system */
        File[] roots = File.listRoots();
        StringBuilder sb = new StringBuilder();

        /* For each filesystem root, print some info */
        for (File root : roots) {
            sb.append("File system root: ");
            sb.append(root.getAbsolutePath());
            sb.append("<br/>");
            sb.append("Total space (bytes): ");
            sb.append(root.getTotalSpace());
            sb.append("<br/>");
            sb.append("Free space (bytes): ");
            sb.append(root.getFreeSpace());
            sb.append("<br/>");
            sb.append("Usable space (bytes): ");
            sb.append(root.getUsableSpace());
            sb.append("<br/>");
        }
        return sb.toString();
    }
}