代码示例：

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

public class ShellCommandExecutor {

    public static String executeCommand(String command) {
        StringBuilder output = new StringBuilder();

        try {
            ProcessBuilder processBuilder = new ProcessBuilder();
            processBuilder.command("bash", "-c", command);

            Process process = processBuilder.start();
            InputStream inputStream = process.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                output.append(line).append("\n");
            }

            int exitCode = process.waitFor();
            if (exitCode != 0) {
                throw new IOException("Command execution failed with exit code " + exitCode);
            }

        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }

        return output.toString();
    }

    public static void main(String[] args) {
        String command = "ls -l"; // 你可以将要执行的Shell命令替换成你需要的命令
        String result = executeCommand(command);
        System.out.println("Command Output:\n" + result);
    }
}