项目初始化
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183
src/main/java/com/mini/capi/utils/HostRuntime.java
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183
src/main/java/com/mini/capi/utils/HostRuntime.java
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package com.mini.capi.utils;
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import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.IOException;
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import java.lang.management.ManagementFactory;
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import java.lang.management.OperatingSystemMXBean;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.time.Instant;
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import java.util.ArrayList;
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import java.util.List;
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public class HostRuntime {
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/**
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* 统一的数据载体
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*/
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public static class Snapshot {
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public String hostName; // 主机名
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public long timestamp; // 采集时间戳（毫秒）
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public double cpuUsage; // CPU 使用率 0~1
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public long memTotal; // 内存总量（Byte）
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public long memFree; // 空闲内存（Byte）
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public long memUsed; // 已用内存（Byte）
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public double memUsage; // 内存使用率 0~1
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public long swapTotal; // Swap 总量
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public long swapUsed; // Swap 已用
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public List<DiskUsage> disks; // 各挂载点磁盘
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public long netRxBytes; // 累计接收字节
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public long netTxBytes; // 累计发送字节
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public double load1; // 1 分钟平均负载
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public int processCount; // 进程数
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public long uptimeSec; // 开机时间（秒）
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@Override
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public String toString() {
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return "Snapshot{" +
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"hostName='" + hostName + '\'' +
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", ts=" + Instant.ofEpochMilli(timestamp) +
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", cpu=" + String.format("%.2f", cpuUsage * 100) + "%" +
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", mem=" + String.format("%.2f", memUsage * 100) + "%" +
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", load=" + load1 +
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", uptime=" + uptimeSec + "s}";
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}
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}
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public static class DiskUsage {
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public String path;
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public long total;
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public long free;
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public long used;
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public double usage;
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public DiskUsage(String path, long total, long free, long used, double usage) {
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this.path = path;
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this.total = total;
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this.free = free;
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this.used = used;
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this.usage = usage;
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}
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}
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/**
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* 采集一次主机状态
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*/
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public static Snapshot collect() {
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Snapshot s = new Snapshot();
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s.timestamp = System.currentTimeMillis();
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try {
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s.hostName = InetAddress.getLocalHost().getHostName();
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} catch (UnknownHostException e) {
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s.hostName = "unknown";
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}
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OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
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s.load1 = os.getSystemLoadAverage();
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s.uptimeSec = getUptimeSec();
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s.processCount = getProcessCount();
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/* ------ CPU ------ */
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s.cpuUsage = getCpuUsage();
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/* ------ Memory ------ */
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long[] mem = getMemInfo();
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s.memTotal = mem[0];
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s.memFree = mem[1];
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s.memUsed = s.memTotal - s.memFree;
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s.memUsage = s.memTotal == 0 ? 0 : (double) s.memUsed / s.memTotal;
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s.swapTotal = mem[2];
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s.swapUsed = mem[3];
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/* ------ Disk ------ */
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s.disks = new ArrayList<>();
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java.io.File[] roots = java.io.File.listRoots();
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for (java.io.File f : roots) {
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long total = f.getTotalSpace();
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long free = f.getFreeSpace();
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long used = total - free;
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double usage = total == 0 ? 0 : (double) used / total;
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s.disks.add(new DiskUsage(f.getPath(), total, free, used, usage));
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}
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/* ------ Network ------ */
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long[] net = getNetInfo();
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s.netRxBytes = net[0];
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s.netTxBytes = net[1];
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return s;
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}
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/* ----------------- 私有工具方法 ----------------- */
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private static double getCpuUsage() {
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// 利用 com.sun.management.OperatingSystemMXBean（JDK 自带）
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com.sun.management.OperatingSystemMXBean sunOs =
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(com.sun.management.OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
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return sunOs.getProcessCpuLoad(); // 进程级
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// 若想系统级：sunOs.getSystemCpuLoad();
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}
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private static long getUptimeSec() {
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// 通过 JVM 启动时间计算
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return ManagementFactory.getRuntimeMXBean().getUptime() / 1000;
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}
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private static int getProcessCount() {
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// 简单实现：线程数，不够精确；若要精确需解析 /proc
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return ManagementFactory.getOperatingSystemMXBean().getAvailableProcessors(); // 仅作示例
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}
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private static long[] getMemInfo() {
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long total = 0, free = 0, swapTotal = 0, swapUsed = 0;
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try (BufferedReader br = new BufferedReader(new FileReader("/proc/meminfo"))) {
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String line;
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while ((line = br.readLine()) != null) {
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if (line.startsWith("MemTotal:")) total = parseMemLine(line);
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if (line.startsWith("MemAvailable:")) free = parseMemLine(line);
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if (line.startsWith("SwapTotal:")) swapTotal = parseMemLine(line);
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if (line.startsWith("SwapFree:")) swapUsed = swapTotal - parseMemLine(line);
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}
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} catch (IOException | NumberFormatException ignore) {
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// fallback to OperatingSystemMXBean
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OperatingSystemMXBean os = ManagementFactory.getOperatingSystemMXBean();
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if (os instanceof com.sun.management.OperatingSystemMXBean) {
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com.sun.management.OperatingSystemMXBean sunOs =
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(com.sun.management.OperatingSystemMXBean) os;
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total = sunOs.getTotalMemorySize();
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free = sunOs.getFreeMemorySize();
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}
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}
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return new long[]{total, free, swapTotal, swapUsed};
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}
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private static long parseMemLine(String line) {
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String[] parts = line.split("\\s+");
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return Long.parseLong(parts[1]) * 1024; // kB -> Byte
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}
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private static long[] getNetInfo() {
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// 读取 /proc/net/dev 第一行即可拿到累计字节
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long rx = 0, tx = 0;
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try (BufferedReader br = new BufferedReader(new FileReader("/proc/net/dev"))) {
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br.readLine();
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br.readLine(); // 跳过表头
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String line;
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while ((line = br.readLine()) != null) {
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line = line.trim();
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if (line.startsWith("lo:")) continue; // 忽略回环
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String[] parts = line.split("\\s+");
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if (parts.length >= 10) {
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rx += Long.parseLong(parts[1]);
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tx += Long.parseLong(parts[9]);
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}
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}
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} catch (IOException | NumberFormatException ignore) {
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// 非 Linux 平台直接返回 0
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}
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return new long[]{rx, tx};
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}
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}
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