未创建Java file.createNewFile文件且未抛出异常

Question

以下代码并不总是创建该文件.据我所知,这个代码第一次运行,虽然没有抛出异常并且createdFileSucceeded == true,但是文件没有被创建.

我在Windows上运行代码,java 6.

任何输入都可能有所帮助

File file = new File(tmpDir, fileName);

try {
if (tmpDir == null) {
  String environmentHomePath // = somePath;
  tmpDir = new File(environmentHomePath, "SampleDumps");

  if (! tmpDir.exists() || ! tmpDir.isDirectory()) {
    boolean mkdirSucceeded = tmpDir.mkdir();
    if (! mkdirSucceeded) {
      throw new IOException("Failed creating directory: '" + tmpDir.getAbsolutePath() + "'");
    }
  }
}

if (file.exists()) {
  boolean deleteFileSucceeded = file.delete(); 
  if (! deleteFileSucceeded) {
    throw new IOException("Unable to delete pre existing sample file: '" + fileName + "'");
  }
}

boolean createFileSucceeded = file.createNewFile();
if (! createFileSucceeded) {
  throw new IOException("Unable to create sample file: '" + fileName + "'");
}

fw = new FileWriter(file);
bw = new BufferedWriter(fw);

StringBuilder sb = new StringBuilder("something...");

bw.write(sb.toString());
bw.flush();
}
catch (IOException ioe) {
log.warn("Unable to file invalid sample to file: '" + fileName + "'", ioe);
}
finally {
if (bw != null) {
  try {
    bw.close();
  } catch (IOException e) {
    log.warn("Unable to close Writer to file: '" + fileName + "'", e);
  }
}
else if (fw != null) {
  try {
    fw.close();
  } catch (IOException e) {
    log.warn("Unable to close Writer to file: '" + fileName + "'", e);
  }
}
}

Answer 1

如果file.createNewFile()返回true则创建文件.

最可能的解释是文件正在创建,但不是在您期望的位置.我希望您使用文件的相对路径名...

仔细查看您的代码和评论,我认为这正是发生的事情.看一下创建临时目录的方式.首先使用tmpdir父目录构造文件.然后你测试看is tmpdiris null并创建一个目录.但是你继续使用FileSTILL拥有null父目录的对象!!

您需要在File检查后创建对象tmpdir,并在需要时创建它.