java 封装一个调用不同的shell命令，返回一个字符转的方法

可以使用Java中的ProcessBuilder类来调用不同的shell命令，并返回一个字符转。以下是一个示例代码：

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

public class ShellCommandExecutor {
    public static String executeCommand(String command) {
        String output = "";
        try {
            ProcessBuilder builder = new ProcessBuilder();
            builder.command("bash", "-c", command);
            Process process = builder.start();
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                output += line + "\n";
            }
            int exitCode = process.waitFor();
            if (exitCode != 0) {
                throw new RuntimeException("Command '" + command + "' returned non-zero exit status " + exitCode);
            }
        } catch (IOException | InterruptedException e) {
            throw new RuntimeException(e);
        }
        return output;
    }
}

你只需要调用`executeCommand`方法并传入你想要执行的shell命令即可。例如，如果你想要执行`ls`命令并返回结果，你可以这样做：

String output = ShellCommandExecutor.executeCommand("ls");
System.out.println(output);

这将在控制台输出`ls`命令的结果。