JAX-RS:如何在返回Response对象时自动序列化集合? [英] JAX-RS: How to automatically serialize a collection when returning a Response object?
问题描述
我有一个带JAXB注释的员工类:
I have a JAXB-annotated employee class:
@XmlRootElement(name = "employee")
public class Employee {
private Integer id;
private String name;
...
@XmlElement(name = "id")
public int getId() {
return this.id;
}
... // setters and getters for name, equals, hashCode, toString
}
和一个JAX-RS资源对象(我使用Jersey 1.12)
And a JAX-RS resource object (I'm using Jersey 1.12)
@GET
@Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
@Path("/")
public List<Employee> findEmployees(
@QueryParam("name") String name,
@QueryParam("page") String pageNumber,
@QueryParam("pageSize") String pageSize) {
...
List<Employee> employees = employeeService.findEmployees(...);
return employees;
}
此端点工作正常。我得到
This endpoint works fine. I get
<employees>
<employee>
<id>2</id>
<name>Ana</name>
</employee>
</employees>
但是,如果我更改方法以返回响应
object,并将员工列表放在响应正文中,如下所示:
However, if I change the method to return a Response
object, and put the employee list in the response body, like this:
@GET
@Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
@Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
@Path("/")
public Response findEmployees(
@QueryParam("name") String name,
@QueryParam("page") String pageNumber,
@QueryParam("pageSize") String pageSize) {
...
List<Employee> employees = employeeService.findEmployees(...);
return Response.ok().entity(employees).build();
}
由于以下异常,端点导致HTTP 500:
the endpoint results in an HTTP 500 due to the following exception:
javax.ws.rs.WebApplicationException:com.sun.jersey.api.MessageException:Java类的消息体编写器java.util.ArrayList和Java类型类java.util.ArrayList,找不到MIME媒体类型application / xml
在第一种情况下,JAX-RS显然安排了正确的消息编写器在返回集合时启动。当集合放置在实体主体中时,这似乎有些不一致。在返回响应时,我可以采取什么方法来实现列表的自动JAXB序列化?
In the first case, JAX-RS has obviously arranged for the proper message writer to kick in when returning a collection. It seems somewhat inconsistent that this doesn't happen when the collection is placed in the entity body. What approach can I take to get the automatic JAXB serialization of the list to happen when returning a response?
我知道我可以
- 只需从资源方法返回列表
- 创建一个单独的
EmployeeList
类
- Just return the list from the resource method
- Create a separate
EmployeeList
class
但是想知道是否有一种很好的方式来使用 Response
对象并获取列表以序列化而不用创建我自己的包装类。
but was wondering whether there is a nice way to use the Response
object and get the list to serialize without creating my own wrapper class.
推荐答案
你可以包装列出< Employee>
,在 GenericEntity
的实例中保存类型信息:
You can wrap the List<Employee>
in an instance of GenericEntity
to preserve the type information:
- http://docs.oracle.com/javaee/6/api/javax/ws/rs/core/GenericEntity.html
这篇关于JAX-RS:如何在返回Response对象时自动序列化集合?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!