Jdk11获取系统信息

下面用到的 api 仅在 jdk11 上测试通过，其他 jdk 版本没试过

工具类 SystemInfoUtils.java

import com.demo.constant.SystemInfoConstant;
import com.sun.management.OperatingSystemMXBean;
import lombok.extern.slf4j.Slf4j;

import java.lang.management.ManagementFactory;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.nio.file.*;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @description: 系统信息工具类
 */

@Slf4j
public class SystemInfoUtils {

    /**
     * 获取本地IP地址
     * @return 本机 ip，过滤了回环地址和 localhost
     */
    public static List<String> getLocalIP() {
        List<String> ipList = new ArrayList<>();
        try {
            // 获取本地所有网络接口
            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
            while (networkInterfaces.hasMoreElements()) {
                NetworkInterface networkInterface = networkInterfaces.nextElement();
                // 排除虚拟接口和未启用的接口
                if (networkInterface.isVirtual() || !networkInterface.isUp()) {
                    continue;
                }
                Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();
                while (inetAddresses.hasMoreElements()) {
                    InetAddress inetAddress = inetAddresses.nextElement();
                    if (!inetAddress.isLinkLocalAddress()) {
                        ipList.add(inetAddress.getHostAddress());
                    }
                }
            }
        } catch (Exception e) {
            log.error("本机 IP 获取失败, 异常详情: " + ExceptionUtil.getErrorMessage(e));
        }
        return ipList.stream().filter(e -> !SystemInfoConstant.INVALID_IP_LIST.contains(e)).collect(Collectors.toList());
    }

    /**
     * 获取CPU数量
     * @return 逻辑处理器数量，物理核数 * 2
     */
    public static int getCpuCount() {
        // 此处有坑，OperatingSystemMXBean 存在于两个包：java.lang.management.OperatingSystemMXBean 和 com.sun.management.OperatingSystemMXBean
        // 一定要找对包，不然有些方法找不到，太特么坑了
        java.lang.management.OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
        return operatingSystemMXBean.getAvailableProcessors();
    }

    /**
     * 获取总内存大小
     * @return 物理内存大小
     */
    public static String getTotalPhysicalMemory() {
        OperatingSystemMXBean osBean = ManagementFactory.getPlatformMXBean(OperatingSystemMXBean.class);
        long physicalMemorySize = osBean.getTotalPhysicalMemorySize();
        double physicalMemoryGB = (double) physicalMemorySize / 1024 / 1024 / 1024;
        DecimalFormat decimalFormat = new DecimalFormat("#.##");
        return decimalFormat.format(physicalMemoryGB) + "GB";
    }

    /**
     * 获取磁盘总大小
     * @return 磁盘总量
     */
    public static String getDiskSizeTotal() {
        String diskSize = null;
        try {
            Path rootDir = Paths.get("/");
            FileStore store = Files.getFileStore(rootDir);
            long totalSpace = store.getTotalSpace();
            double totalGB = (double) totalSpace / 1024 / 1024 / 1024;
            DecimalFormat decimalFormat = new DecimalFormat("#.##");
            diskSize = decimalFormat.format(totalGB + "GB");
        } catch (Exception e) {
            log.error("磁盘信息获取失败, 异常详情: {}", ExceptionUtil.getErrorMessage(e));
        }
        return diskSize;
    }

    /**
     * 获取已使用磁盘大小
     * @return 磁盘已使用量
     */
    public static String getDiskSizeUsed() {
        String diskSize = null;
        try {
            Path rootDir = Paths.get("/");
            FileStore store = Files.getFileStore(rootDir);
            long usableSpace = store.getUsableSpace();
            double usableGB = (double) usableSpace / 1024 / 1024 / 1024;
            DecimalFormat decimalFormat = new DecimalFormat("#.##");
            diskSize = decimalFormat.format(usableGB + "GB");
        } catch (Exception e) {
            log.error("磁盘信息获取失败, 异常详情: {}", ExceptionUtil.getErrorMessage(e));
        }
        return diskSize;
    }

    /**
     * 获取可用磁盘大小
     * @return 磁盘可使用量
     */
    public static String getDiskSizeFree() {
        String diskSize = null;
        try {
            Path rootDir = Paths.get("/");
            FileStore store = Files.getFileStore(rootDir);
            long freeSpace = store.getUnallocatedSpace();
            double freeGB = (double) freeSpace / 1024 / 1024 / 1024;
            DecimalFormat decimalFormat = new DecimalFormat("#.##");
            diskSize = decimalFormat.format(freeGB + "GB");
        } catch (Exception e) {
            log.error("磁盘信息获取失败, 异常详情: {}", ExceptionUtil.getErrorMessage(e));
        }
        return diskSize;
    }
}

常量类 SystemInfoConstant.java

import java.util.List;

/**
 * @description: 系统信息常量
 */
public class SystemInfoConstant {
    /**
     * ipv4 回环地址
     */
    public static final String IPV4_LOOP_ADDRESS = "0.0.1.1";

    /**
     * ipv6 回环地址
     */
    public static final String IPV6_LOOP_ADDRESS = "0:0:0:0:0:0:0:1%lo0";

    /**
     * 本机 IP
     */
    public static final String LOCAL_HOST = "127.0.0.1";

    /**
     * 无效的 ip 地址列表，需要排除
     */
    public static final List<String> INVALID_IP_LIST = List.of(IPV4_LOOP_ADDRESS, IPV6_LOOP_ADDRESS, LOCAL_HOST);

异常信息获取工具类 ExceptionUtil.java

import org.springframework.util.StringUtils;
import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * @description: 异常工具类
 */
public class ExceptionUtil {
    /**
     * 异常信息允许的最大长度，超过这个长度会被截取
     */
    private static final Integer ERROR_MSG_MAX_LENGTH = 2000;

    /**
     * 获取异常的堆栈信息
     *
     * @param e 异常对象
     * @return 堆栈信息
     */
    public static String getErrorMessage(Exception e) {
        if (StringUtils.hasText(e.getMessage())) {
            return e.getMessage();
        }
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw, Boolean.TRUE));
        String message = sw.toString();
        return message.length() > ERROR_MSG_MAX_LENGTH ? message.substring(0, ERROR_MSG_MAX_LENGTH) : message;
    }
}