Java没有在目录中获取文件

Question

    System.out.println("READ");

    String currentWorldName = "RANDOM";
    String propertiesFileDirectory = propertiesFolder + currentWorldName + "/props.properties";
    String entitiesFolderDirectory = propertiesFolder + currentWorldName + "/Entities";

    try 
    {
        properties.load(new FileInputStream(propertiesFileDirectory));
    } 

    catch (FileNotFoundException e)
    {
        //Since it doesn't exist either it was deleted by the user or hasn't been created yet.
        createNewPropertiesFile();
    } 

    catch (IOException e) 
    {
        outputToLog("IOException when loading properties file for the world: '" + currentWorldName + "'.\n" + e.getStackTrace().toString());
    }

    //getting values from properties

    //Now to read each properties file in Entities
    File entitiesFolder = new File(entitiesFolderDirectory);

    try 
    {
        List<String> entitiesDirectoryContents = Arrays.asList(entitiesFolder.list());

        //Read each file in the entities directory and load it into memory.
        for (String entityPropertiesFileName : entitiesDirectoryContents)
        {
            if (propertiesBelongsToEntityCH(entityPropertiesFileName))
            {
                                 //Get properties one way
            }

            else //The properties file we're working does not belong to CH.
            {
                //Get properties from the same file a different way
            }
        }
               //This should never be hit since we have the file to read.
    catch (FileNotFoundException e) 
    {
        outputToLog("FileNotFoundException when loading entity properties file." + e.getMessage().toString());
    } 

    //I don't know when/if this would be hit. It hasn't happened.
    catch (IOException e) 
    {
        outputToLog("IOException when loading entity properties file." + e.getMessage().toString());
    }

    catch (NullPointerException e)
     {
          entitiesFolder.mkdirs();
     }

This HAS been working, I swear. It just started doing this. Java keeps claiming that the "entitiesFolder" directory doesn't exist (I check with entitiesFolder.exists()). I have a solution for when that happens as you can see, because while my program is running it definitely can happen. Well it still claims that the folder doesn't exist, over and over.

I'm absolutely positive that it's the right directory because I print the "entitiesFolderDirectory" out to the console. It's correct. I can also be looking at the files inside of that folder and when mkdirs() runs it just deletes them all.

Java bug? This has completely broken my program.

Answer 1

I would write it without throwing a NullPointerException.

File entitiesFolder = new File(entitiesFolderDirectory);
entitiesFolder.mkdirs();
for (String entityPropertiesFileName : entitiesFolder.list()) {
     //Do stuff
}

This will always work unless the folder could not be created.

Answer 2

What is the problem with this code? only one curly braces i found is missing else it is working fine.

This will create a dir test in c drive if does not exist else it will list the files in test dir over n over again

String entitiesFolderDirectory = "C:\\test";
        File entitiesFolder = new File(entitiesFolderDirectory);

        try 
        {
            List<String> entitiesDirectoryContents = Arrays.asList(entitiesFolder.list());

            for (String entityPropertiesFileName : entitiesDirectoryContents)
            {
                System.out.println(entityPropertiesFileName);
            }

        }catch (NullPointerException e)
        {
            System.out.println("creating new folder");
            entitiesFolder.mkdirs();
        }