Скачать или смотреть How to Prevent WebClient from Merging Responses Using bodyToFlux in Spring WebFlux

Discover how to effectively handle multiple responses in Spring WebFlux by customizing the `bodyToFlux` method, ensuring you receive output one-by-one instead of merged together.
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Handling Multiple WebClient Responses in Spring WebFlux

When working with Spring WebFlux and using the WebClient to fetch data, you might encounter an unexpected behavior: instead of receiving individual responses separately, they get merged into a single string. This can lead to confusion, especially when you're looking to process each response one by one. In this post, we will delve into how to handle multiple responses effectively using bodyToFlux and customize them to suit your needs.

The Problem

Imagine you are executing multiple asynchronous tasks using ParallelFlux, and when you attempt to retrieve the responses from a WebClient call using the bodyToFlux method, you find that all of the outputs are merged together. Here’s a quick overview of what we’re dealing with:

ParallelFlux for Asynchronous Tasks: You are using ParallelFlux to run several tasks in parallel.

Merging Responses: When receiving responses via bodyToFlux, the output appears as a single merged string rather than individual responses.

Desired Outcome: You want to output responses separately, allowing for better manipulation and readability.

Here’s a simplified code snippet illustrating the issue at hand:

[[See Video to Reveal this Text or Code Snippet]]

The Current Response Method

The method you're using to convert a list to a mapped response looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

However, the output you're receiving resembles the following (merged together):

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To address this issue, we recommend creating a dedicated response class instead of directly using the string response. Here’s how to implement this approach:

Step 1: Create a Response Body Class

Start by defining a ResponseBody class that will hold the structure of your response. For instance:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Modify the ParallelFlux Method

Update your method to create instances of ResponseBody based on the logic you have. Here’s an example:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Adjust Your WebClient Call

Replace the bodyToFlux(String.class) with bodyToFlux(ResponseBody.class) to ensure that the responses are mapped correctly to your new class:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By creating a custom ResponseBody class and adjusting your bodyToFlux invocation accordingly, you can ensure that your WebClient receives and processes responses individually, rather than merging them together. This method provides clarity and control over how the data is handled in your Spring WebFlux applications.

In summary, if you want to ensure individual responses in a reactive data stream using Spring WebFlux, modifying your response handling to leverage a dedicated response class is the key to clarity and robustness in your application.

Implement these steps in your application, and you'll be able to handle multiple responses smoothly and efficiently.