How to Run a Shell Command in Java

服用下面的範例, 完成在 java 存取外部指令:

ProcessBuilder processBuilder = new ProcessBuilder();
processBuilder.command("bash", "-c", "ls /tmp/my-folder-root/");
try {
	Process process = processBuilder.start();
	StringBuilder output_string = new StringBuilder();
	BufferedReader reader = new BufferedReader(
			new InputStreamReader(process.getInputStream()));
	String line;
	while ((line = reader.readLine()) != null) {
		output_string.append(line + "\n");
	}

	int exitVal = process.waitFor();
	if (exitVal == 0) {
		System.out.println("Success!");
		System.out.println(output_string);
	} else {
		//abnormal...
	}
} catch (IOException e) {
	e.printStackTrace();
} catch (InterruptedException e) {
	e.printStackTrace();
}	

執行結果:

說明: 先在 terminal 裡建立資料夾名稱hello-max, 在 eclipse 的 tomcat 的 console 裡可以看到程式輸出的字串, 與實際在檔案系統中的資料夾.