Скачать или смотреть How to Pass Two Parameters and Return a JSON Array Using Ajax in Spring MVC

Learn how to effectively pass two parameters to your Spring MVC backend using Ajax and retrieve a JSON array response.
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How to Pass Two Parameters and Return a JSON Array Using Ajax in Spring MVC

In today's web development landscape, interacting with server-side frameworks like Spring MVC through Ajax is a common requirement. It allows developers to send and retrieve data without refreshing the page, creating a smoother user experience. However, configuring this interaction correctly can sometimes be tricky. In this guide, we will explore how to pass two string parameters to your Spring MVC backend and fetch a JSON array response using Ajax.

Scenario Overview

Imagine you are working on a web application where users can filter data based on a date range. You need the ability to send two date parameters – startDate and endDate – to your Spring MVC backend, query the database, and then return the results as a JSON array. The challenge arises when you encounter a type mismatch error when handling these parameters on the server side.

Step-by-Step Solution

Step 1: Prepare Your Ajax Request

First, you need to set up your Ajax call to send the necessary parameters to your Spring MVC controller. Here’s a snippet of your Ajax call:

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

Step 2: Adjust Your Spring MVC Controller

Next, you’ll need to modify your Spring MVC controller method that will handle this Ajax request. Here’s a sample of how this should look:

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

Key Adjustments Made:

Request Body Handling: Instead of directly using @ RequestBody String, we're using @ RequestBody Map<String, String>. This captures the entire JSON object sent from the client, making it easier to extract multiple parameters.

Proper Return Statement: Ensure that your service method (adminService.selectCouponByTerm) returns the actual list of Coupon instead of a string. The earlier version resulted in a type mismatch error. By ensuring the return type is a List<Coupon>, we fix this issue.

Step 3: Return JSON Data Correctly

Finally, ensure your adminService.selectCouponByTerm method is correctly querying the database and returning the relevant data. Your method should look something like this:

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

Conclusion

By following this structured approach, you should be able to effectively use Ajax to send two parameters to your Spring MVC backend and retrieve a JSON array response without any errors. Remember to always check the types expected by your controller and ensure the data you send matches those expectations.

If you have any further questions or need clarification on any of these steps, feel free to reach out in the comments below!