Implementing Pagination in Java Spring Boot

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Summary: Learn how to implement pagination in a Spring Boot application using Page and Pageable interfaces to manage data effectively and improve performance.
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Pagination is an essential technique in web applications to efficiently handle and display large datasets. In a Spring Boot application, pagination can be easily implemented using the Spring Data JPA Page and Pageable interfaces. Here's how you can set up and use pagination in your Spring Boot application:

Step 1: Set Up Your Repository

In your Spring Boot application, define a repository interface for your data model that extends PagingAndSortingRepository or JpaRepository from Spring Data JPA:

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In this example, MyEntityRepository is the repository for your entity MyEntity. The findAll method returns a Page of MyEntity instances, accepting a Pageable parameter.

Step 2: Create a Controller Method

In your controller, create an endpoint that accepts pagination parameters (such as page number and page size) and uses the repository's method to fetch the paginated data:

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In this example, getMyEntities is a REST endpoint that accepts a Pageable parameter. Spring will automatically bind request parameters such as page, size, and sort to the Pageable object.

Step 3: Handle Pagination in the Client

On the client side, you can pass pagination parameters such as page, size, and sort as query parameters in your API request:

page: The page number you want to fetch (starting from 0).

size: The number of records per page.

sort: The sort order for the results.

For example, you might make a request to /api/my-entities?page=0&size=10&sort=name,asc.

Step 4: Process the Response

The Page interface provides information about the paginated data, such as:

getContent(): Returns the list of entities on the current page.

getTotalElements(): Returns the total number of elements across all pages.

getTotalPages(): Returns the total number of pages.

isFirst() and isLast(): Return whether the current page is the first or last page.

You can use this information to manage pagination in your application, such as displaying page numbers and next/previous buttons for navigation.

By following these steps, you can easily implement pagination in your Spring Boot application using Spring Data JPA.