I am trying to set the file but did not find a place where I can indicate the server that this is the remote file location. Also, Use BufferedWriter to write data in the File and once you are done, in finally close the file as below. I found a workaround to accomplish this task, I used linux commands to create and populate my file like this:.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to write a file remotely using java [duplicate] Ask Question. Asked 2 years, 10 months ago. Active 2 years, 10 months ago. Viewed 3k times.
Not sure this is possible. I don't think it should be, neither, this would mean a serious security breach. The URL class opens up a connection to the given URL and the openStream method returns an input stream which is used to read data from the connection.
These classes are used for reading from a file and writing to it, respectively. The contents are read as bytes and copied to a file in the local directory using the FileOutputStream.
To lower the number of lines of code we can use the Files class available from Java 7. The Files class contains methods that read all the bytes at once and then copies it into another file.
Here is how you can use it:. Java NIO is an alternative package to handle networking and input-output operations in Java. The main advantage that the Java NIO package offers is that it's non-blocking, and has channeling and buffering capabilities. When we use the Java IO library we work with streams that read data byte by byte.
However, the Java NIO package uses channels and buffers. The buffering and channeling capabilities allow the system to copy contents from a URL directly into the intended file without needing to save the bytes in application memory, which would be an intermediary step. The ability to work with channels boosts performance.
The downloaded contents will be transferred to a file on the local system via the corresponding file channel. After defining the file channel we will use the transferFrom method to copy the contents read from the readChannel object to the file destination using the writeChannel object. The transferFrom and transferTo methods are much more efficient than working with streams using a buffer.
The transfer methods enable us to directly copy the contents of the file system cache to the file on the system. Thus direct channeling restricts the number of context switches required and enhances the overall code performance.
Now, in the following sections, we will be looking at ways to download files from a URL using third-party libraries instead of core Java functionality components. Now you may be thinking why would we use this when Java has its own set of libraries to handle IO operations. However, Apache Commons IO overcomes the problem of code rewriting and helps avoid writing boilerplate code. In order to start using the Apache Commons IO library, you will need to download the jar files from the official website.
When you are done downloading the jar files, you need to add them to use them. If you are using an Integrated Development Environment IDE such as Eclipse , you will need to add the files to the build path of your project. For instance, connecting to a server with the phoenixnap username at the IP address When connecting to a remote system with SFTP, use the following options with the sftp command to change its behavior:.
Use the get and put commands to create a file transfer request in SFTP. The get command transfers the files from a remote server to the local system, while the put command does the opposite. Using the get command transfers a file from the remote server to the local system's Home directory. For instance:.
On the other hand, using the put command transfers a file from the local system to the remote server's Home directory:. To transfer the file to a different directory, append the name of the directory to the end of the get or put command:. To change the name of the file on the local system, append the new filename to the end of the command:. The get and put commands use the following options:. SFTP also allows you to modify file and directory permissions on the remote server.
The chown command changes file ownership for individual users:. Unlike the chown command, which requires a user ID, the chmod command works the same as in the standard shell:. Another option is to use the chgrp command to change the group ownership of a file:. Note: Learn how you can view user and group ID for the remote server.
SFTP also lets you set up a local umask, changing the default permission for all future files transferred to the local system. Use the lumask command to set up a new local umask :. SFTP provides options that allow users to review and manage files on both the local system and remote server.
The ls command lets you list out the files and directories on the remote server. Similarly, the lls local ls command lists files and directories on the local system:.
Learn more in our guide to the Linux ls command. The cd and lcd commands change the current working directory on the remote server or local system, respectively:. Using the mkdir command creates a directory on the remote server with the path you provide:.
The mkdir command has no output, so you need to use the ls command to verify the result:. Similar to this, the lmkdir command creates a directory on the local system:.
The rename command changes the name of a file or directory on the remote server:. Similarly, the rmdir command removes a directory from the remote server:. Note: Learn more in our guide to removing files and directories in Linux. The ln and symlink commands create a symbolic link to a file or directory on the remote server:.
For instance, creating a link to example The pwd command shows the current working directory on the remote server as the output:.
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