java查询linux的操作系统版本方法

在Java中查询Linux的操作系统版本可以通过以下代码实现：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class OSInfo {
    private static String OS = System.getProperty("os.name").toLowerCase();

    public static void main(String[] args) {
        System.out.println(getOSVersion());
    }

    public static String getOSVersion() {
        String version = "";
        if (isLinux()) {
            ProcessBuilder pb = new ProcessBuilder("cat", "/etc/os-release");
            try {
                Process process = pb.start();
                BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
                String line;
                while ((line = reader.readLine()) != null) {
                    if (line.startsWith("VERSION_ID=")) {
                        version = line.substring(line.indexOf("=") + 1).replaceAll("\"", "");
                        break;
                    }
                }
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return version;
    }

    public static boolean isLinux() {
        return (OS.indexOf("linux") >= 0);
    }
}

该代码会在Linux系统中执行cat /etc/os-release命令，并通过读取命令输出的内容来获取Linux的操作系统版本信息。