Переход на SpringBoot 3 и добавление примера со Slice

pom.xml

@@ -5,17 +5,21 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.7.5</version>
+        <version>3.1.0</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
+
     <groupId>dev.struchkov.example</groupId>
     <artifactId>spring-pagination</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+
     <name>spring-pagination</name>
     <description>spring-pagination</description>
+
     <properties>
         <java.version>17</java.version>
     </properties>
+
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>

request/requests.http

@@ -2,6 +2,10 @@
 GET http://localhost:8080/api/post?offset=0&limit=3
 Content-Type: application/json
 
+### Получить первую страницу из 3 элементов
+GET http://localhost:8080/api/post/exampleSlice?offset=0&limit=3
+Content-Type: application/json
+
 ### Получить вторую страницу из 3 элементов с сортировкой
 GET http://localhost:8080/api/post/exampleSort?offset=1&limit=3&sort=createOn
 Content-Type: application/json

src/main/java/dev/struchkov/example/Post.java

@@ -1,11 +1,11 @@
 package dev.struchkov.example;
 
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
 import lombok.Getter;
 import lombok.Setter;
 
-import javax.persistence.Entity;
-import javax.persistence.Id;
-import javax.persistence.Table;
 import java.time.LocalDateTime;
 import java.util.UUID;
 

src/main/java/dev/struchkov/example/PostController.java

@@ -1,16 +1,16 @@
 package dev.struchkov.example;
 
+import jakarta.validation.constraints.Min;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Slice;
 import org.springframework.data.domain.Sort;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
-import javax.validation.constraints.Min;
-
 @RestController
 @RequestMapping("api/post")
 @RequiredArgsConstructor
@@ -26,6 +26,14 @@ public class PostController {
         return repository.findAll(PageRequest.of(offset, limit));
     }
 
+    @GetMapping("exampleSlice")
+    public Slice<Post> getAllSlice(
+            @RequestParam(value = "offset", defaultValue = "0") @Min(0) Integer offset,
+            @RequestParam(value = "limit", defaultValue = "20") Integer limit
+    ) {
+        return repository.findAllSlice(PageRequest.of(offset, limit));
+    }
+
     @GetMapping("exampleSort")
     public Page<Post> getAllAndSort(
             @RequestParam("offset") Integer offset,

src/main/java/dev/struchkov/example/PostRepository.java

@@ -2,6 +2,7 @@ package dev.struchkov.example;
 
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Slice;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
@@ -10,6 +11,9 @@ import java.util.UUID;
 
 public interface PostRepository extends JpaRepository<Post, UUID> {
 
+    @Query("SELECT p FROM Post p")
+    Slice<Post> findAllSlice(Pageable pageable);
+
     Page<Post> findAllByTitleLikeIgnoreCase(String titleLike, Pageable pageable);
 
     @Query("SELECT p FROM Post p WHERE p.title like %:title%")