带有 Gson 的 Spring Data JPA 页面和 JSON

Question

我使用带有依赖项的xml配置的spring mvc：

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.12</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-jaxrs</artifactId>
        <version>1.9.12</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-core-asl</artifactId>
        <version>1.9.12</version>
    </dependency>

    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.4</version>
    </dependency>

转换为 JSON。但是使用 Spring data JPA Page 结果是空的： {}。使用存储库：

@Repository("personRepository")
public interface PersonRepository extends CrudRepository<Person, Long> {

    Page<Person> findAll(Pageable pageable);

}

和控制器：

@RestController
public class ApiController {

    @Autowired
    PersonService personService;

    @GetMapping(value = {"/api/person/getpage"}, produces = {"application/json"})
    public Page<Person> getPerson() {
        return personService.findAll(new PageRequest(0, 10));
    }
}

谁能告诉我如何将正确的数据返回到格式：

{ "totalPages":501,
"totalElements":5001,
"size":10,
"content":[{"id":1,"firstName":"Joe","lastName":"Doe"}, 
           {"id":2,"firstName":"Mich","lastName":"Jogger"}, 
           {"id":3,"firstName":"Santa","lastName":"Close"}, ...],
"number":0,
"numberOfElements":10,
"sort":null,
"last":false,
"first":true}

我

Answer 1

您必须在控制器中将返回类型更改为List<Person>。我可以在 db 中看到 5001 条记录。示例控制器代码，

@GetMapping(value = {"/api/person/getpage"}, produces = {"application/json"})
public List<Person> getPerson() {
    Page<Person> pagePersonList = personService.findAll(new PageRequest(0, 10));
    List<Person> personList = pagePersonList.getContent();
    return personList;
}

如果有任何问题或疑问，请告诉我。