java怎么运行cmd命令

在Java中，你可以使用Runtime类或ProcessBuilder类来运行CMD命令

方法1：使用Runtime类

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

public class RunCmdCommand {
    public static void main(String[] args) {
        try {
            String command = "cmd.exe /c dir"; // 这里可以替换为你想要运行的命令
            Process process = Runtime.getRuntime().exec(command);

            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            process.waitFor();
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

方法2：使用ProcessBuilder类

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class RunCmdCommand {
    public static void main(String[] args) {
        try {
            String[] command = {"cmd.exe", "/c", "dir"}; // 这里可以替换为你想要运行的命令
            ProcessBuilder processBuilder = new ProcessBuilder(Arrays.asList(command));
            processBuilder.redirectErrorStream(true);

            Process process = processBuilder.start();

            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            process.waitFor();
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

这两个示例都会运行cmd.exe /c dir命令，该命令会列出当前目录下的所有文件和文件夹。你可以根据需要修改command数组中的命令。