Java 从Netbeans执行python脚本并读取输出在一种情况下失败，但在另一种情况下不会失败

我目前正在听取这个堆栈溢出帖子的建议：

（用于获取输出的链接）

这很好，我成功地将其用于以下代码：

        String directPath;
        if (Files.exists(Paths.get("C:/Users/jiaqin/Documents/NetBeansProjects/NCHandler/nchandlerv2/NCPythonFiles/"))) {
            directPath = "C:/Users/jiaqin/Documents/NetBeansProjects/NCHandler/nchandlerv2/NCPythonFiles/";
        }
        else {
            directPath = "/home/lab/testNetconf/NCPythonFiles/net_back_end/";
        }

        Process p = Runtime.getRuntime().exec("python " + directPath + "get_platform_and_OS.py -ssh_ip " + ui.ssh_ip
        + " -username " + ui.username + " -password " + ui.password);
        Scanner threeInfo = new Scanner(p.getInputStream());


        String hostName = "";
        String IP_Address = ui.ssh_ip;
        String OS = "";
        String platform = "";

        int iter = 0;
        while (threeInfo.hasNextLine()) {
            switch(iter) {
                case 0:
                    hostName = threeInfo.nextLine();
                    break;
                case 1:
                    OS = threeInfo.nextLine();
                    break;
                case 2:
                    platform = threeInfo.nextLine();
                    break;
                default:
                    break;
            }
            iter ++;
        }

        threeInfo.close();

        Label hostNameLabel = new Label(hostName);
        Label sshLabel = new Label("SSH IP Address: " + IP_Address);
        Label OSLabel = new Label(OS);
        Label platformLabel = new Label(platform);

基本上，我通过首先确定python脚本的路径来运行它，然后使用扫描器（而不是像本文中那样的BufferedReader）读取输出。基于这种情况，我有一个更晚的方法，使用了完全相同的概念：

public static String verifyShowCommands(String[] showCommands, MainUI ui) {
    try {
        String errorText = "";

        String retErrors = "";

        System.out.println("Python exec command is:\n" + "python /home/lab/testNetconf/NCPythonFiles/net_back_end/verify_show_commands.py -ssh_ip " + ui.ssh_ip + " -username " 
                + ui.username + " -password " + ui.password + " -show_commands \"" + String.join(", ", showCommands) + "\"");

        Process p = Runtime.getRuntime().exec("python /home/lab/testNetconf/NCPythonFiles/net_back_end/verify_show_commands.py -ssh_ip " + ui.ssh_ip + " -username " 
                + ui.username + " -password " + ui.password + " -show_commands \"" + String.join(", ", showCommands) + "\"");
        BufferedReader obtainedInfo = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String read = null;
        while ((read = obtainedInfo.readLine()) != null) {
            System.out.println("New line found");
            retErrors += read;
        }
        System.out.println("Obtained Info is:" + retErrors + " and that's it");
        obtainedInfo.close();
        for (int i = 0; i < showCommands.length; i ++) {
            if (i < showCommands.length - 1) {
                int thisSCStart = retErrors.indexOf(showCommands[i]);
                int nextSCStart = retErrors.indexOf(showCommands[i+1]);
                String outputSC = retErrors.substring(thisSCStart, nextSCStart);
                if (outputSC.contains("'Valid': 'No'")) {
                    errorText += outputSC + "\n";
                }
            }
            else {
                String outputSC = retErrors.substring(retErrors.indexOf(showCommands[i]));
                if (outputSC.contains("'Valid': 'No'")) {
                    errorText += outputSC + "\n";
                }
            }
        }
        return errorText;
    }
    catch (IOException e) {
        return null;
    }
}

然后，您可能会问一个显而易见的问题：如果命令无效怎么办？我也在顶部打印了整个exec命令：

        System.out.println("Python exec command is:\n" + "python /home/lab/testNetconf/NCPythonFiles/net_back_end/verify_show_commands.py -ssh_ip " + ui.ssh_ip + " -username " 
                + ui.username + " -password " + ui.password + " -show_commands \"" + String.join(", ", showCommands) + "\"");

因此，我在Netbeans输出中查找该行，结果如下：

Info:   Python exec command is:
python /home/lab/testNetconf/NCPythonFiles/net_back_end/verify_show_commands.py -ssh_ip 9.0.0.12 -username root -password lab -show_commands "show bgp scale"

然后我复制粘贴到终端并运行它，我得到了一个输出（输出中打印结果的实际类型是字典，因此括号）：

有人有什么建议吗？这让我非常沮丧，因为我使用get_platform_和os.py遵循第一个案例的确切格式，但是使用verify_show_commands.py，它什么也看不到

作为旁注，如果这些信息有帮助，当我在终端中手动运行命令时，大约需要2-3秒才能完成。然而，在我的项目中运行它只需要不到一秒钟的时间就可以出错。

所以

显然这是一件事。我只是将命令中的每个单词改为数组元素，在数组中输入“show bgp scale”，但不带引号。在那之后，它成功了

Info:   Python exec command is:
python /home/lab/testNetconf/NCPythonFiles/net_back_end/verify_show_commands.py -ssh_ip 9.0.0.12 -username root -password lab -show_commands "show bgp scale"