In this example, we are simulating the content with a loop to generate multiple strings to send as a stream response. StreamingResponseBody will be added into the body section of ResponseEntity. Start the server and add following url in the web browser. Flux has the streaming capabilities out of the box. The whole code mentioned in the previous example can be replaced with a single line and everything works exactly in the same way. You will see the streaming output in the browser as shown in the following image, both ways will show the exact same output.
This content type tells the client that it will stream json objects, so keep the connection alive until the server confirms the end of the response stream. The JSON object as a string will be written to the object of StreamingResponseBody and to simulate streaming we have added a thread sleep of 1 second.
In the illustrated example, I am simulating the content using a loop via interval. Flux automatically manages the database cursors, so for a large dataset, it streams all the database objects without overloading the server resources. In this example, we will create a stream of text which will be downloaded as a file on the client side. The special thing here will be the file will start downloading immediately on the client side, but our streaming response will keep on writing the content in the downloaded file.
Until the streaming response write is not complete from the server, the Web browser will keep showing the downloading of the file. The special thing we will be doing here is about headers. You will see a file immediately get downloaded and the streaming response keeps on writing on that file. In Spring Boot REST api, a very common requirement is to download existing files, which might be present in a file system, resources folder or on cloud like S3 etc.
Here we will simply create an object of StreamingResponseBody and provide the path of the file to be downloaded. In ResponseEntity , we need to mention the content type and content disposition header. There's no need to create the table manually as I have set up spring.
It will fire the DDL command when the application starts to create a table according to the Entity class defined in Java. Create a repository interface for the above entity to get built-in CRUD operations method support. Add our own new method to check whether a particular file is present for that user or not. Create a Service class to store and download files on the server, and to store information in the database.
Join For Free. The GitHub link is provided at the end of the article. Spring Boot 2. M5 Swagger 2. Slf4j; import org. SpringApplication; import org. EnableAutoConfiguration; import org. SpringBootApplication; import org.
EnableDiscoveryClient; import org. Bean; import org. FileUtils; import org. I am using Postman tool to test the file download application. Look at the download URL and download path in the above image. So your file download URL could be anything from where you want to download the file.
Path; import java. Rajesh Rajesh 3, 1 1 gold badge 28 28 silver badges 29 29 bronze badges. Felipe Desiderati Felipe Desiderati 1, 1 1 gold badge 14 14 silver badges 35 35 bronze badges. DownloadFile 'filename. Turns out that if you have a file with spaces in its name, you won't get the entire filename in the response without the double quotes.
Good call, fetahokey — Dana. Taras Melon Taras Melon 4 4 silver badges 15 15 bronze badges. Feng Zhang Feng Zhang 1, 10 10 silver badges 18 18 bronze badges. Send back directly InputStreamResource with inputStream. You don't need to copy stream. The Overflow Blog. Introducing Content Health, a new way to keep the knowledge base up-to-date. Podcast what if you could invest in your favorite developer?
0コメント