如何使用JFileChooser保存txt文件? [英] How to save a txt file using JFileChooser?

问题描述

给出此方法:

public void OutputWrite (BigInteger[] EncryptCodes) throws FileNotFoundException{

    JFileChooser chooser = new JFileChooser();

    chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);  
    chooser.showSaveDialog(null);

    String path = chooser.getSelectedFile().getAbsolutePath();

    PrintWriter file = new PrintWriter(new File(path+"EncryptedMessage.txt"));

    for (int i = 0; i <EncryptCodes.length; i++) { 
        file.write(EncryptCodes[i]+ " \r\n");     
    }
    file.close();
}

忽略变量名，此方法的作用是将EncryptCodes的数据写入在名为EncryptedMessage.txt的项目文件夹中生成的txt文件中.

Ignoring the variable names, what this method does is writes data of EncryptCodes in the txt file generated inside the project folder called EncryptedMessage.txt.

我需要的是一种保存该txt文件而不是保存在项目文件夹中的方法，以将其保存在用户在运行期间指定的位置(打开另存为"对话框).我认为这可以通过JFilechooser完成，但我无法使其正常工作.

What I need is a method to save that txt file instead of in the project folder , to be saved in a location specified by the user during running (Opens a Save As Dialog Box). I think it can be done by JFilechooser, but I can't get it to work.

推荐答案

您可以添加一个单独的方法来获取保存位置，如下所示:

You could add a separate method for getting the save location like so:

private File getSaveLocation() {
   JFileChooser chooser = new JFileChooser();
   chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);  
   int result = chooser.showSaveDialog(this);

   if (result == chooser.APPROVE_OPTION) { 
      return chooser.getSelectedFile();
   } else {
      return null;
   }
}

，然后将结果用作带有父/目录参数的重载File构造函数的参数:

and then use the result as an argument to the overloaded File constructor that takes a parent/directory argument:

public void writeOutput(File saveLocation, BigInteger[] EncryptCodes)
                 throws FileNotFoundException {

   PrintWriter file = 
        new PrintWriter(new File(saveLocation, "EncryptedMessage.txt"));
   ...
}

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