Http download using java

As shown above, we had created a class with a main method. When the main method is executed, our Java program does several things. Firstly, we had declared an instance of ReadableByteChannel and an instance of FileChannel to contain null values so as to facilitate closure in the finally block. After we had done so, we define a try block for running the file download logic that may throw checked exceptions.

Once we have done so, we get an instance of ReadableByteChannel that is mapped to the input stream of urlConnection. After we had an instance of ReadableByteChannel , we then proceed to get a FileChannel that will point to a local file path where we want to save the downloaded file.

In this case, we want to save the downloaded file as robots. Finally, we use fileChannelForDownloadedFile. There can be cases where the client need to supply some information to the HTTP server in order to download a file. Like Article. Java Program to read and download webpage Steps: 1. Create a URL object and pass url as string to download the webpage. Create Buffered Reader object and pass openStream.

Create a string object to read each line one by one from stream. Write each line in html file where webpage will be downloaded. Close all objects. Catch exceptions if url failed to download. String line;. DownloadWebPage url ;. Attention reader! Such earnings keep Techcoil running at no added cost to your purchases.

Please read my disclosure for more info. Even though there are many Java external libraries to help us do so, using the facilities in the Java standard runtime installation is not difficult.

Furthermore, we will be able to keep our Java application leaner if we can download files without additional dependencies. As shown above, we had created a class with a main method. When the main method is executed, our Java program does several things. Firstly, we had declared an instance of ReadableByteChannel and an instance of FileChannel to contain null values so as to facilitate closure in the finally block.

After we had done so, we define a try block for running the file download logic that may throw checked exceptions. Once we have done so, we get an instance of ReadableByteChannel that is mapped to the input stream of urlConnection. After we had an instance of ReadableByteChannel , we then proceed to get a FileChannel that will point to a local file path where we want to save the downloaded file.

In this case, we want to save the downloaded file as robots.