如何在Java中创建目录？
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How to create a directory in Java?
提问by jimmy
How do I create Directory/folder?
如何创建目录/文件夹？
Once I have tested System.getProperty("user.home");
一旦我测试过 System.getProperty("user.home");
I have to create a directory (directory name "new folder" ) if and only if new folder does not exist.
当且仅当新文件夹不存在时，我必须创建一个目录（目录名称“新文件夹”）。
采纳答案by Jigar Joshi
After ~7 year, I will update it to better approach which is suggested by Bozho.
大约 7 年后，我会将其更新为 Bozho 建议的更好方法。
new File("/path/directory").mkdirs();
Deprecated:
弃用：
File theDir = new File("new folder");
// if the directory does not exist, create it
if (!theDir.exists()) {
System.out.println("creating directory: " + theDir.getName());
boolean result = false;
try{
theDir.mkdir();
result = true;
}
catch(SecurityException se){
//handle it
}
if(result) {
System.out.println("DIR created");
}
}
回答by Bozho
new File("/path/directory").mkdirs();
Here "directory" is the name of the directory you want to create/exist.
这里的“目录”是您要创建/存在的目录的名称。
回答by Jon Freedman
The following method should do what you want, just make sure you are checking the return value of mkdir()/ mkdirs()
下面的方法应该做你想做的，只要确保你正在检查mkdir()/ mkdirs()的返回值
private void createUserDir(final String dirName) throws IOException {
final File homeDir = new File(System.getProperty("user.home"));
final File dir = new File(homeDir, dirName);
if (!dir.exists() && !dir.mkdirs()) {
throw new IOException("Unable to create " + dir.getAbsolutePath();
}
}
回答by ahvargas
You can try FileUtils#forceMkdir
你可以试试FileUtils#forceMkdir
FileUtils.forceMkdir("/path/directory");
This libraryhave a lot of useful functions.
这个库有很多有用的功能。
回答by arun
回答by Fathah Rehman P
public class Test1 {
public static void main(String[] args)
{
String path = System.getProperty("user.home");
File dir=new File(path+"/new folder");
if(dir.exists()){
System.out.println("A folder with name 'new folder' is already exist in the path "+path);
}else{
dir.mkdir();
}
}
}
回答by score
Though this question has been answered. I would like to put something extra, i.e. if there is a file exist with the directory name that you are trying to create than it should prompt an error. For future visitors.
虽然这个问题已经回答了。我想添加一些额外的东西，即如果存在一个与您尝试创建的目录名称相同的文件，那么它应该会提示错误。对于未来的访客。
public static void makeDir()
{
File directory = new File(" dirname ");
if (directory.exists() && directory.isFile())
{
System.out.println("The dir with name could not be" +
" created as it is a normal file");
}
else
{
try
{
if (!directory.exists())
{
directory.mkdir();
}
String username = System.getProperty("user.name");
String filename = " path/" + username + ".txt"; //extension if you need one
}
catch (IOException e)
{
System.out.println("prompt for error");
}
}
}
回答by Boubakr
This function allows you to create a directory on the user home directory.
此功能允许您在用户主目录上创建目录。
private static void createDirectory(final String directoryName) {
final File homeDirectory = new File(System.getProperty("user.home"));
final File newDirectory = new File(homeDirectory, directoryName);
if(!newDirectory.exists()) {
boolean result = newDirectory.mkdir();
if(result) {
System.out.println("The directory is created !");
}
} else {
System.out.println("The directory already exist");
}
}
回答by Mouna
Create a single directory.
new File("C:\Directory1").mkdir();Create a directory named “Directory2 and all its sub-directories “Sub2″ and “Sub-Sub2″ together.
new File("C:\Directory2\Sub2\Sub-Sub2").mkdirs()
创建单个目录。
new File("C:\Directory1").mkdir();创建一个名为“Directory2”的目录及其所有子目录“Sub2”和“Sub-Sub2”。
new File("C:\Directory2\Sub2\Sub-Sub2").mkdirs()
Source: this perfect tutorial, you find also an example of use.
来源：这个完美的教程，您还可以找到一个使用示例。
回答by Matt Bonness
Just wanted to point out to everyone calling File.mkdir()or File.mkdirs()to be careful the Fileobject is a directory and not a file. For example if you call mkdirs()for the path /dir1/dir2/file.txt, it will create a folderwith the name file.txtwhich is probably not what you wanted. If you are creating a new file and also want to automatically create parent folders you can do something like this:
只是想向每个调用的人指出File.mkdir()或File.mkdirs()要注意File对象是目录而不是文件。例如，如果您调用mkdirs()path /dir1/dir2/file.txt，它将创建一个名称可能不是您想要的文件夹file.txt。如果您正在创建一个新文件并且还想自动创建父文件夹，您可以执行以下操作：
File file = new File(filePath);
if (file.getParentFile() != null) {
file.getParentFile().mkdirs();
}
