Question

我最近制作了一个为网站备份的应用程序。有一部分用于备份网站，另一部分用于数据库。

我使用硬编码数据运行应用程序后，我认为最好使用.txt文件读取值，这样就不需要更改java应用程序中的数据了。这样您就不必在每次添加网站时重新编译应用程序。

我添加了.txt reade我的while循环停止工作，我不知道为什么。也许我犯了一个基本错误，但我看不出是什么。我希望你能提供帮助。

我包含了一个if函数，因为读取文本文件两次读取内容所以它不会尝试打开名为root的数据库：

if (!"root".equals(dbName)) {
  executeCmd = init + command;
  String printDate = new SimpleDateFormat(" yyyy-MM-dd - HH  mm ss").format(Calendar.getInstance().getTime());
  JTextArea.append("\n" + printDate + executeCmd);
  /*NOTE: Executing the command here*/
  Process runtimeProcess = Runtime.getRuntime().exec(executeCmd);
  processComplete = runtimeProcess.waitFor();
}

我认为这可能是这个但是当我禁用它时没有任何变化。

我目前有这个代码（我禁用了ip地址等）

public class executeCmd1 {
    public String dbName;
    public String dbUser;
    public String part1;
    public String part2;
    public String executeCmd;
    public int processComplete;

    public void executeCmd1() {
        worker = new SwingWorker<Void, Void>() {
            @Override
            protected Void doInBackground() throws Exception {
                while (true) {
                    System.out.println("Tekst1");
                    try {
                        System.out.println("Tekst2");
                        System.out.println("Reading File from Java code");
                        //Name of the file
                        //*NOTE: Getting path to the Jar file being executed*/
                        //*NOTE: YourImplementingClass-> replace with the class executing the code*/
                        CodeSource codeSource = executeCmd1.class.getProtectionDomain().getCodeSource();
                        File jarFile = new File(codeSource.getLocation().toURI().getPath());
                        String jarDir = jarFile.getParentFile().getPath();

                        String fileName = "Textfile\\textfile.txt";
                        //Create object of FileReader
                        FileReader inputFile = new FileReader(fileName);


                        //Instantiate the BufferedReader Class
                        BufferedReader bufferReader = new BufferedReader(inputFile);

                        //Variable to hold the one line data
                        String line;

                        // Read file line by line and print on the console
                        line = bufferReader.readLine();
                        String[] strs = line.split("-");
                        System.out.println("Substrings length:" + strs.length);
                        for (int i = 0; i < strs.length; i++) {
                            String onderdelen = (strs[i] + "-" + strs[(i + 1)]);

                            String[] parts = onderdelen.split(Pattern.quote("-"));
                            part1 = parts[0];
                            part2 = parts[1];
                            System.out.println(part1 + " " + part2);

                            //Close the buffer reader
                            bufferReader.close();

                            /*NOTE: Creating Database Constraints*/
                            dbName = part1;
                            dbUser = part2;

                            /*NOTE: Creating Path Constraints for folder saving*/
                            //*NOTE: Here the backup folder is created for saving inside it*/
                            String folderPath = jarDir + "\\backup";

                            /*NOTE: Creating Folder if it does not exist*/
                            File f1 = new File(folderPath);
                            f1.mkdir();

                            /*NOTE: Creating Path Constraints for backup saving*/
                            //*NOTE: Here the backup is saved in a folder called backup with the name backup.sql*/
                            String init = "cmd /c start timeout 0 & cd /d C:\\xampp\\mysql\\bin\\ & ";
                            String checkoutDate = new SimpleDateFormat(" yyyy-MM-dd - HH  mm ss").format(Calendar.getInstance().getTime());
                            String command = "mysqldump -P 3306 -h 192.168.50.166 -u " + dbUser + " --databases " + dbName + " -r \"%cd%\\backup\\backup " + checkoutDate + dbName + " file.sql\" & start cmd /c echo fisished ^& timeout 5";
                            JTextArea.append("\n Er wordt een backup gemaakt van " + dbName + " en op de gebruiker " + dbUser);
                            /*NOTE: Used to create a cmd command*/
                            if (!"root".equals(dbName)) {
                                executeCmd = init + command;
                                String printDate = new SimpleDateFormat(" yyyy-MM-dd - HH  mm ss").format(Calendar.getInstance().getTime());
                                JTextArea.append("\n" + printDate + executeCmd);
                                /*NOTE: Executing the command here*/
                                Process runtimeProcess = Runtime.getRuntime().exec(executeCmd);
                                processComplete = runtimeProcess.waitFor();

                            }
                            /*NOTE: processComplete=0 if correctly executed, will contain other values if not*/
                            if (processComplete == 0) {
                                String printDate = new SimpleDateFormat(" yyyy-MM-dd - HH  mm ss").format(Calendar.getInstance().getTime());
                                JTextArea.append("\n" + printDate + " Backup van datbase compleet");
                            } else {
                                String printDate = new SimpleDateFormat(" yyyy-MM-dd - HH  mm ss").format(Calendar.getInstance().getTime());
                                JTextArea.append("\n" + printDate + " Backup van database mislukt");
                            }
                            Thread.sleep(4000);
                        }

                    } catch (URISyntaxException | IOException | InterruptedException ex) {
                        return null;

                    }
                    System.out.println("Tekst3");
                }
            }

        };
        worker.execute();
        System.out.println("Tekst4");
    }
}

如果有必要，我可以在删除文本文件之前提供代码以显示差异。

Answer 1

for循环中存在一个问题，它从.txt文件中读取值。

它正在搜索不存在的值，因此它在for循环中崩溃。

该循环的修正如下所示。

for (int i = 0; i < (strs.length - 1); i++) {
System.out.println("start of for loop");
String onderdelen = (strs[i] + "-" + strs[(i + 1)]);

Answer 2

你提供了非常详细的代码，也许你可以稍微删除你的例子。

我认为问题在于你打开文件，读取一行，拆分行，并为每个子串关闭BufferedReader。你应该只关闭一次BufferedReader。

我的建议是使用java.util.Properties来读取文件（Properties.load（Reader））。然后，您可以使用getProperty（）读取文件中的值。

而循环背景工人打破

2 个答案: