如何使用java获取用户设备信息

import javax.servlet.http.HttpServletRequest;

public class DeviceInfo {
    public static void main(String[] args) {
        HttpServletRequest request = ... ; // 从请求中获取HttpServletRequest对象

        // 获取操作系统信息
        String userAgent = request.getHeader("User-Agent");
        String os = "Unknown";
        if (userAgent.toLowerCase().contains("windows")) {
            os = "Windows";
        } else if (userAgent.toLowerCase().contains("mac")) {
            os = "Mac";
        } else if (userAgent.toLowerCase().contains("linux")) {
            os = "Linux";
        } else if (userAgent.toLowerCase().contains("android")) {
            os = "Android";
        } else if (userAgent.toLowerCase().contains("iphone")) {
            os = "iOS";
        }
        System.out.println("操作系统：" + os);

        // 获取浏览器信息
        String browser = "Unknown";
        if (userAgent.toLowerCase().contains("msie")) {
            browser = "Internet Explorer";
        } else if (userAgent.toLowerCase().contains("firefox")) {
            browser = "Firefox";
        } else if (userAgent.toLowerCase().contains("chrome")) {
            browser = "Chrome";
        } else if (userAgent.toLowerCase().contains("safari")) {
            browser = "Safari";
        }
        System.out.println("浏览器：" + browser);
    }
}