Java删除文件的更好方法（如果存在）
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Java better way to delete file if exists
提问by Michal Chmi
We need to call file.exists()before file.delete()before we can delete a file E.g.
我们需要调用file.exists()beforefile.delete()才能删除文件 例如
File file = ...;
if (file.exists()){
file.delete();
}
Currently in all our project we create a static method in some util class to wrap this code. Is there some other way to achieve the same , so that we not need to copy our utils file in every other project.
目前，在我们所有的项目中，我们在一些 util 类中创建了一个静态方法来包装此代码。有没有其他方法可以实现相同的目的，这样我们就不需要在每个其他项目中复制我们的 utils 文件。
采纳答案by sol4me
Starting from Java 7 you can use deleteIfExiststhat returns a boolean (or throw an Exception) depending on whether a file was deleted or not. This method may not be atomic with respect to other file system operations. Moreover if a file is in use by JVM/other program then on some operating system it will not be able to remove it. Every file can be converted to path via toPathmethod . E.g.
从 Java 7 开始，您可以使用deleteIfExists返回布尔值（或抛出异常），具体取决于文件是否被删除。对于其他文件系统操作，此方法可能不是原子的。此外，如果 JVM/其他程序正在使用文件，那么在某些操作系统上它将无法删除它。每个文件都可以通过toPath方法转换为路径。例如
File file = ...;
boolean result = Files.deleteIfExists(file.toPath()); //surround it in try catch block
回答by Eugen
There's also the Java 7 solution, using the new(ish) Path abstraction:
还有 Java 7 解决方案，使用 new(ish) Path 抽象：
Path fileToDeletePath = Paths.get("fileToDelete_jdk7.txt");
Files.delete(fileToDeletePath);
Hope this helps.
希望这可以帮助。
回答by Martijn Courteaux
At my machine, I can just do:
在我的机器上，我可以这样做：
file.delete()
if the file doesn't exist, it will return false.
如果文件不存在，它将返回false。
回答by java_joe
This is my solution:
这是我的解决方案：
File f = new File("file.txt");
if(f.exists() && !f.isDirectory()) {
f.delete();
}
回答by everblack
I was working on this type of function, maybe this will interests some of you ...
我正在研究这种类型的功能，也许这会让你们中的一些人感兴趣......
public boolean deleteFile(File file) throws IOException {
if (file != null) {
if (file.isDirectory()) {
File[] files = file.listFiles();
for (File f: files) {
deleteFile(f);
}
}
return Files.deleteIfExists(file.toPath());
}
return false;
}
回答by yogesh rajguru
File xx = new File("filename.txt");
if (xx.exists()) {
System.gc();//Added this part
Thread.sleep(2000);////This part gives the Bufferedreaders and the InputStreams time to close Completely
xx.delete();
}
回答by RANA DINESH
Use the below statement to delete any files:
使用以下语句删除任何文件：
FileUtils.forceDelete(FilePath);
Note:Use exception handlingcodes if you want to use.
注意：exception handling如果要使用，请使用代码。
回答by S Williams
Apache Commons IO's FileUtilsoffers FileUtils.deleteQuietly:
Apache Commons IO 的FileUtils提供FileUtils.deleteQuietly：
Deletes a file, never throwing an exception. If file is a directory, delete it and all sub-directories. The difference between File.delete() and this method are:
- A directory to be deleted does not have to be empty.
- No exceptions are thrown when a file or directory cannot be deleted.
删除文件，从不抛出异常。如果文件是一个目录，删除它和所有子目录。File.delete() 和这个方法的区别是：
- 要删除的目录不必为空。
- 无法删除文件或目录时不会引发异常。
This offers a one-liner delete call that won't complain if the file fails to be deleted:
这提供了一个单行删除调用，如果文件无法删除，它不会抱怨：
FileUtils.deleteQuietly(new File("test.txt"));
回答by Sourabh Bhavsar
Use Apache Commons FileUtils.deleteDirectory()or FileUtils.forceDelete()to log exceptions in case of any failures,
使用 Apache Commons FileUtils.deleteDirectory()或FileUtils.forceDelete()在出现任何故障时记录异常，
or FileUtils.deleteQuietly()if you're not concerned about exceptions thrown.
或者FileUtils.deleteQuietly()如果你不关心抛出的异常。
