How to download text file in java

When the returned value is -1, you can use the function copyLarge inputStream, fileOS in place of the copy inputstream, fileOS function to handle this load. Both of these functions buffer the inputstream internally. The internal buffer means we do not have to use the BufferedInputStream class to enhance our code performance and helps us avoid writing boilerplate code. Another library managed by the Apache organization is the HttpComponents package. This library uses the request-response mechanism to download the file from a given URL.

The first step to downloading a file is to create an HTTP client object that would issue the request to the server. For this, we will be using the CloseableHttpClient class. The code snippet that creates a new HTTP client is as follows:.

We then need to create an HttpGet or HttpPost object to send the request to the server. The request is created by the following line of code:.

The execute request function is applied to the client object and returns with a response from the server.

Once the request is sent to the server we need a response object to receive the data sent from the server. To catch the response from the server we use the HttpResponse class object.

The data sent by the server in the form of a message is obtained through the getEntity function. You can also obtain the response code sent by the server through the response object and use it to your specific need. The data to be downloaded is encapsulated within the entity object and can be extracted using the getContent function.

The getContent function returns an InputStream object that can be further used with a BufferedInputStreamReader to enhance performance. Service ; import dev. Firstly, inject the FileExporter to the controller and implement a method in order to show the index page. The final DownloadController class as follows. File ; import java. FileInputStream ; import java. FileNotFoundException ; import java. URI ; import java.

Path ; import javax. There are many ways to read a text file in java. Java 8 introduced Stream class java. Stream which gives a lazy and more efficient way to read a file line by line. BufferedReader is very simple and high performance technique of reading text files in Java. It reads the text from a character input stream. Connect and share knowledge within a single location that is structured and easy to search. I formed an url in the controller.

When I hit that url i need to export a. As I am new to this concept , I have a doubts ,. In a couple of projects I've used this utility class from codejava. The code i have written is just a three lines to download the. Thank you all For the help. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

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