How to count downloads of a file in java

Add a comment. Active Oldest Votes. Improve this answer. Thanks for the valuable input, let me try it and will revert if any issues — Sushant Verma. Godfather, if you found this answer useful and to have sorted out your doubts please mark it as the accepted answer. Because you haven't marked any of your questions as accepted yet you can see here how to do it. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. 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. There is only a single line of code required to download a file, which looks like:. The connection and read timeouts convey the permissible time for which either the connection may stay idle or reading from the URL may stop.

We will use the copy inputStream, fileOS method to download a file into the local system. Lastly, it compares the two approaches of getting file counts and suggests the better one. Let us now look at the two approaches for getting count of files in a directory starting with File , and then moving on to Path with DirectoryStream.

Approach 1 — Using java. IOException; import java. DirectoryStream; import java. Files; import java. Java program to count number of lines in a file If you have a file with lines as follows- This is a test file.

Line number reader is used to read this file. This program will read all the lines. It will give the count. Then you can get the count of lines using the following code- import java.