Spring Data REST自定义查询集成

Question

我想为Employee实体创建REST链接，该实体基本上是findByAllFields查询。当然这应该与Page和Sort相结合。为了做到这一点我已经实现了下面的代码：

@Entity 
public class Employee extends Persistable<Long> { 

    @Column 
    private String firstName; 

    @Column 
    private String lastName; 

    @Column 
    private String age; 

    @Column 
    @Temporal(TemporalType.TIMESTAMP) 
    private Date hiringDate; 
} 

所以我想有让说，一个查询在那里我可以这样做：

http://localhost:8080/myApp/employees/search/all?firstName=me&lastName=self&ageFrom=20&ageTo=30&hiringDateFrom=12234433235 

所以我有以下Repository

@RepositoryRestResource(collectionResourceRel="employees", path="employees") 
public interface EmployeeRepository extends PagingAndSortingRepository<Employee, Long>, 
                 JpaSpecificationExecutor<Employee> { 

} 

好了，所以现在我需要一个RestController

@RepositoryRestController 
public class EmployeeSearchController { 

    @Autowired 
    private EmployeeRepository employeRepository; 

    @RequestMapping(value = "/employees/search/all/search/all", method = RequestMethod.GET) 
    public Page<Employee> getEmployees(EmployeeCriteria filterCriteria, Pageable pageable) { 

     //EmployeeSpecification uses CriteriaAPI to form dynamic query with the fields from filterCriteria 
     Specification<Employee> specification = new EmployeeSpecification(filterCriteria); 

     return employeeRepository.findAll(specification, pageable); 
} 

好吧，显然这是它的工作，但它没有与HATEOAS集成。 我试图组装一个资源改变控制器这样的：

public PagedResources<Resource<Employee>> getEmployees(
       PagedResourcesAssembler<Employee> assembler, 
       EmployeeCriteria filterCriteria, Pageable pageable) { 

     //EmployeeSpecification uses CriteriaAPI to form dynamic query with the fields from filterCriteria 
     Specification<Employee> specification = new EmployeeSpecification(filterCriteria); 

     Page<Employee> employees = employeeRepository.findAll(specification, pageable); 
     return assembler.toResource(employees); 
} 

很显然，我失去了一些东西从上面的，因为它不工作，我收到以下异常：

Could not instantiate bean class [org.springframework.data.web.PagedResourcesAssembler]: No default constructor found; 

好吧，以便明确问题我正在尝试将上述资源整合到HATEOAS架构的其余部分。我不完全确定这是否是正确的方法，因此欢迎任何其他建议。

编辑： 在这里你可以看到一个类似的实现。请看看配置，你会看到除“人”控制器之外的所有控制器都在工作。 https://github.com/cgeo7/spring-rest-example

Answer 1

尝试autowring PagedResourcesAssembler为一类成员，改变方法签名类似下面

@RepositoryRestController 
public class EmployeeSearchController { 

    @Autowired 
    private EmployeeRepository employeRepository; 

    @Autowired 
    private PagedResourcesAssembler<Employee> pagedAssembler; 

    @RequestMapping(value = "/employees/search/all/search/all", method = RequestMethod.GET) 
    public ResponseEntity<Resources<Resource<Employee>>> getEmployees(EmployeeCriteria filterCriteria, Pageable pageable) { 

     //EmployeeSpecification uses CriteriaAPI to form dynamic query with the fields from filterCriteria 
     Specification<Employee> specification = new EmployeeSpecification(filterCriteria); 

     Page<Employee> employees = employeeRepository.findAll(specification, pageable); 
     return assembler.toResource(employees); 
    } 
} 

这由@ Stackee007工作，但与Spring数据休息2.1.4.RELEASE

Answer 2

我从来没有使用弹簧的数据和我没有多少意识到这一点，但是从春http://projects.spring.io/spring-hateoas/一个新的项目，我在春天MVC REST服务已经使用而且运作非常良好。

Answer 3

的代码完全工作该资源将不包括self链接。为了做到这一点，需要多一点。

@Autowired 
PagedResourcesAssembler<Appointment> pagedResourcesAssembler; 

@RequestMapping(value = "/findTodaysSchedule") 
public HttpEntity<PagedResources<Resource<Appointment>>> getTodaysSchedule(
     PersistentEntityResourceAssembler entityAssembler, Pageable pageable) { 
    Page<Appointment> todaysSchedule = apptRepo.findByStartTimeBetween(beginningOfDay, endOfDay, pageable); 

    @SuppressWarnings({ "unchecked", "rawtypes" }) 
    PagedResources<Resource<Appointment>> resource = pagedResourcesAssembler.toResource(todaysSchedule, 
       (ResourceAssembler) entityAssembler); 

    return new ResponseEntity<>(resource, HttpStatus.OK); 
}