Write url to file java

Skip to content. Post Views: 3, Convert File to URL. File; import java. MalformedURLException; import java. URI; import java. File ;. MalformedURLException ;. URI ;. URL ;. File file ;. Add a comment. Try flushing the buffer and closing the BufferedWriter : bw. And I think you should close FileWriter , too, in order to unblock the file.

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Linked Here we will be using the BufferedInputStream and the URL classes to open and read a file on a given address to a file on our local system. The reason we use the BufferedInputStream class instead of the InputStream is its buffering ability that gives our code a performance boost. Before we dive deeper into the coding aspect let's take an overview of the classes and the individual functions we will be using in the process.

The java. URL class in Java is a built-in library that offers multiple methods to access and manipulate data on the internet. In this case, we will be using the openStream function of the URL class. The method signature for the openStream function is:. The openStream function works on an object of the URL class. 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.

It can do this by following these steps:. Here is a small servlet named ReverseServlet or if you prefer a cgi-bin script. You can use this servlet to test the following example program. The servlet running in a container reads from its InputStream, reverses the string, and writes it to its OutputStream. Let's examine the program and see how it works.

First, the program processes its command-line arguments:. These statements ensure that the user provides two and only two command-line arguments to the program.

The command-line arguments are the location of the ReverseServlet and the string that will be reversed. It may contain spaces or other non-alphanumeric characters.