File.createNewFile（）throws IOException没有这样的文件或目录 [英] File.createNewFile() thowing IOException No such file or directory

问题描述

我有一个写入日志文件的方法。如果文件存在，它应该追加到它，如果没有，那么我希望它创建一个新的文件。

  if（！file .exists（）&&！file.createNewFile（））{
 System.err.println（输出文件错误：+ outFile 
 +\\\
无法创建新文件。 ; 
继续; 
 
 
 
 $ b我有这个来检查文件是否可以被创建。文件是一个java.io.File对象。 createNewFile抛出一个IOException：没有这样的文件或目录。自从我几个星期前写这个方法以来，这个方法一直运行的很好，最近才开始这样做，尽管我不知道我能改变什么。我已经检查，目录存在，我有写权限，但后来我认为它应该只是返回false，如果由于任何原因无法生成文件。
 
 
 
有什么我失踪，以得到这个工作？通常这是你最近改变的东西，首先关闭你的样品代码是如果不是文件存在，而不是创建新文件 - 你正试图代码的东西 - 这是什么？
 
 
然后，看一个目录列表，看看它是否实际上是存在的，并在文件对象上执行println / toString（）和getMessage（）以及打印堆栈跟踪。 
 
 
然后，从零知识再次，并从每一步，你用来到这里起点的因素。这可能是一个呃，你在代码概念化（因为它正在工作）的地方卡在那里 - 你只是回顾每一步的细节，你会发现它。
 
I have a method that writes to a log file. If the file exists it should append to it, if not then I want it to create a new file.
if (!file.exists() && !file.createNewFile()) {
    System.err.println("Error with output file: " + outFile
        + "\nCannot create new file.");
    continue;
}
I have that to check that a file can be created. file is a java.io.File object. createNewFile is throwing an IOException: No such file or directory. This method has been working perfectly since I wrote it a few weeks ago and has only recently starting doing this although I don't know what I could have changed. I have checked, the directory exists and I have write permissions for it, but then I thought it should just return false if it can't make the file for any reason.

Is there anything that I am missing to get this working?
解决方案
normally this is something you changed recently, first off your sample code is if not file exists and not create new file - you are trying to code away something - what is it?

Then, look at a directory listing to see if it actually exists and do a println / toString() on the file object and getMessage() on the exception, as well as print stack trace.

Then, start from zero knowledge again and re factor from the get-go each step you are using to get here. It's probably a duh you stuck in there somewhere while conceptualizing in code ( because it was working ) - you just retrace each step in detail, you will find it.

                        
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