如何从exec命令中获取错误信息

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

public class ExecCommandExample {
    public static void main(String[] args) {
        try {
            // 执行exec命令
            Process process = Runtime.getRuntime().exec("your_exec_command");

            // 获取错误输出流
            InputStream errorStream = process.getErrorStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(errorStream));

            // 读取错误信息
            StringBuilder errorMessage = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                errorMessage.append(line).append("\n");
            }

            // 关闭流
            reader.close();
            errorStream.close();

            // 处理错误信息
            if (errorMessage.length() > 0) {
                System.out.println("执行exec命令出错，错误信息如下：");
                System.out.println(errorMessage.toString());
            } else {
                System.out.println("执行exec命令成功！");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}