Create a New Folder Using Java Program on Windows and Linux MAChines

Create a New folder using Java Program on Windows and Linux machines

new File("/path/to/folder").mkdir();

If you want to created nested folders (i.e. more than one folder on the path may be missing), then use mkdirs(). See java.io.File.

Note that forward slashes would normally not work on windows, but Java normalizes the path and translates forward to backward slashes.

Java create directory using File for Unix / Windows

You should use the System user.home property which will return the user's home directory in a system independent manner, for example...

 File home = new File(System.getProperty("user.home"));

mkdir will only create the last element in the path, where as mkdirs will create all the elements that do not exist. Using mkdirs is probably a slightly better idea as it ensures (where permissions allow) that all elements in the path will be created if they do not exist

How to create a directory in Java?

After ~7 year, I will update it to better approach which is suggested by Bozho.

File theDir = new File("/path/directory");
if (!theDir.exists()){
    theDir.mkdirs();
}

JAVA - Create a file in linux server

If the machine "10.30.10.117" is on your local network and if you have the permission to create file on that machine then the problem is

File folder = new File("//10.30.10.117:/home/images/784/");
File file   = new File("//10.30.10.117:/home/images/784/1508-1-N.png");
folder.mkdirs();
file.createNewFile();

Before write to file create it.

But if the machine "10.30.10.117" is on external network for your machine then you can't create a file or folder directly from your machine. You need ftp connection vb...

How can I write to a file in linux using java code which runs on my windows machine?

You can do that with external library JSch.
The below should do the job.

JSch jsch = new JSch();
Session session = jsch.getSession("remote_user_name", "remote_host_or_ip", 22); // 22 for SFTP
session.setPassword("remote_password");


java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);

session.connect(10000);
Channel channel = session.openChannel("sftp");
channel.connect();

System.out.println("Connection Opened");
ChannelSftp channelSftp = (ChannelSftp) channel;
InputStream inputStream = new FileInputStream("text_file.txt");
channelSftp.put(inputStream, "/remote/folder/file_to_be_rewritten.txt");

System.out.println("File should be uploaded");

channelSftp.disconnect();
session.disconnect();

How to create a file in a directory in java?

The best way to do it is:

String path = "C:" + File.separator + "hello" + File.separator + "hi.txt";
// Use relative path for Unix systems
File f = new File(path);

f.getParentFile().mkdirs(); 
f.createNewFile();

how to create folders for a specific user on a web application container?

I wouldn't expose the folder directly through URLs as that would be a serious security concern where one user can access the folder of another user if the naming scheme is understood.

Instead, I would

• create folders by user name in a separate location that is not accessible through the URL, using the java.io.File.mkdir().

• write a simple Servlet that would read the servletRequest.getPathInfo(), identifies the user name from the path, along with the file to be served. For this to happen, the servlet class and URL pattern should be defined as follows:

  <servlet-mapping>
      <servlet-name>read-file</servlet-name>
      <url-pattern>/read-file/*</url-pattern>
  </servlet-mapping>
  

  To access a file a.pdf of user xyz, the URL would be http://server/read-file/xyz/a.pdf.

• check if the user accessing the URL is same as the user name found in the path info.

• read the file through a FileInputStream in blocks of, say 1MB, and write into the ServletOutputStream (without storing anywhere in between) after setting the appropriate values in the Content-Type and Content-Disposition headers.

Creating a folder within web server under /public_html/ in Java

To point to public web directory use

ServletContext context = request.getServletContext();
String path = context.getRealPath("/");

and append your path to the path (above resolved)

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