使用Java nio创建子目录和文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/21958083/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Using Java nio to create a subdirectory and file
提问by user3341332
I'm creating a simple program that will try to read in "conf/conf.xml" from disk, but if this file or dir doesn't exist will instead create them.
我正在创建一个简单的程序，它将尝试从磁盘读取“conf/conf.xml”，但如果此文件或目录不存在，则会创建它们。
I can do this using the following code:
我可以使用以下代码执行此操作：
// create subdirectory path
Path confDir = Paths.get("./conf");
// create file-in-subdirectory path
Path confFile = Paths.get("./conf/conf.xml");
// if the sub-directory doesn't exist then create it
if (Files.notExists(confDir)) {
try { Files.createDirectory(confDir); }
catch (Exception e ) { e.printStackTrace(); }
}
// if the file doesn't exist then create it
if (Files.notExists(confFile)) {
try { Files.createFile(confFile); }
catch (Exception e ) { e.printStackTrace(); }
}
My questions is if this really the most elegant way to do this? It seems superflous to need to create two Paths simple to create a new file in a new subdirectory.
我的问题是这是否真的是最优雅的方式来做到这一点？需要创建两个简单的路径来在新子目录中创建新文件似乎是多余的。
采纳答案by Marko Gre?ak
You could declare your confFileas Fileinstead of Path. Then you can use confFile.getParentFile().mkdirs();, see example below:
你可以声明你的confFileasFile而不是Path. 然后你可以使用confFile.getParentFile().mkdirs();，见下面的例子：
// ...
File confFile = new File("./conf/conf.xml");
confFile.getParentFile().mkdirs();
// ...
Or, using your code as is, you can use:
或者，按原样使用您的代码，您可以使用：
Files.createDirectories(confFile.getParent());
回答by user3504158
You could do the following:
您可以执行以下操作：
// Get your Path from the string
Path confFile = Paths.get("./conf/conf.xml");
// Get the portion of path that represtents directory structure.
Path subpath = confFile.subpath(0, confFile.getNameCount() - 1);
// Create all directories recursively
/**
* Creates a directory by creating all nonexistent parent directories first.
* Unlike the {@link #createDirectory createDirectory} method, an exception
* is not thrown if the directory could not be created because it already
* exists.
*
*/
Files.createDirectories(subpath.toAbsolutePath()))
回答by Valeriy K.
You can create directory and file in one code line:
您可以在一行代码中创建目录和文件：
Files.createFile(Files.createDirectories(confDir).resolve(confFile.getFileName()))
Files.createFile(Files.createDirectories(confDir).resolve(confFile.getFileName()))
Files.createDirectories(confDir)will not throw an exception if the folder already exists and returns Path in any case.
Files.createDirectories(confDir)如果文件夹已经存在，则不会抛出异常并在任何情况下返回 Path。
