MongoDB 使用 SpringBoot 暴露为 REST：返回对象类型是什么

Question

通过使用 SpringBoot 将 MongoDB 集合公开为 REST 服务，我在服务上执行 HTTP GET 时会返回这样的文档

$ curl http://localhost:8080/people
{
  "_links" : {
    "self" : {
      "href" : "http://localhost:8080/people{?page,size,sort}",
      "templated" : true
    },
    "search" : {
      "href" : "http://localhost:8080/people/search"
    }
  },
 "_embedded" : {
    "persons" : [ {
      "firstName" : "Frodo",
      "lastName" : "Baggins",
      "_links" : {
        "self" : {
          "href" : "http://localhost:8080/people/53149b8e3004990b1af9f229"
        }
      }
    } ]
  },
  "page" : {
    "size" : 20,
    "totalElements" : 1,
    "totalPages" : 1,
    "number" : 0
  }
}

集合中包含的人物位于“_embedded”部分。

我想简单地使用人员列表，那么要使用的 URL 是什么？或者，这个返回的文档的对象类型是什么，以便我可以反序列化它？

Answer 1

这些只是 Spring Mongo 数据休息 API 上可用的休息端点。

{[/{people}],methods=[OPTIONS],produces=[application/hal+json || application/json]}
{[/{people}],methods=[HEAD],produces=[application/hal+json || application/json]}
{[/{people}],methods=[GET],produces=[application/hal+json || application/json]}
{[/{people}],methods=[GET],produces=[application/x-spring-data-compact+json || text/uri-list]
{[/{people}],methods=[POST],produces=[application/hal+json || application/json]}
{[/{people}/{id}],methods=[OPTIONS],produces=[application/hal+json || application/json]}
{[/{people}/{id}],methods=[HEAD],produces=[application/hal+json || application/json]}
{[/{people}/{id}],methods=[GET],produces=[application/hal+json || application/json]}
{{/{people}/{id}],methods=[PUT],produces=[application/hal+json || application/json]}
{[/{people}/{id}],methods=[PATCH],produces=[application/hal+json || application/json]}
{[/{people}/{id}],methods=[DELETE],produces=[application/hal+json || application/json]}
{[/ || ],methods=[OPTIONS],produces=[application/hal+json || application/json]}
{[/ || ],methods=[HEAD],produces=[application/hal+json || application/json]}
{[/ || ],methods=[GET],produces=[application/hal+json || application/json]}
{[/{people}/{id}/{property}],methods=[GET],produces=[application/hal+json || application/json]}
{[/{people}/{id}/{property}/{propertyId}],methods=[GET],produces=[application/hal+json || application/json]}
{[/{people}/{id}/{property}],methods=[DELETE],produces=[application/hal+json || application/json]}
{[/{people}/{id}/{property}],methods=[GET],produces=[application/x-spring-data-compact+json || text/uri-list]}
{[/{people}/{id}/{property}],methods=[PATCH || PUT || POST],consumes=[application/json || application/x-spring-data-compact+json || text/uri-list],produces=[application/hal+json || application/json]}
{[/{people}/{id}/{property}/{propertyId}],methods=[DELETE],produces=[application/hal+json || application/json]}
{[/{people}/search],methods=[HEAD],produces=[application/hal+json || application/json]}
{[/{people}/search],methods=[GET],produces=[application/hal+json || application/json]}
{[/{people}/search],methods=[OPTIONS],produces=[application/hal+json || application/json]}
{[/{people}/search/{search}],methods=[GET],produces=[application/hal+json || application/json]}
{[/{people}/search/{search}],methods=[GET],produces=[application/x-spring-data-compact+json]}
{[/{people}/search/{search}],methods=[OPTIONS],produces=[application/hal+json || application/json]}
{[/{people}/search/{search}],methods=[HEAD],produces=[application/hal+json || application/json]}

如果我们知道某个特定文档的 _id，我们就可以获得一个个人文档。

我们只能使用搜索 api 获取 _embedded json 对象。例如，

@RepositoryRestResource(collectionResourceRel = "people", path = "people")
public interface PersonRepository extends MongoRepository<Person, String> {

      List<Person> findAllByIdIsNotNull();

}

由于 _id 在 MongoDB 中不会为空，如果我们点击此端点 http://localhost:8080/people/search/findAllByIdIsNotNull，我们可以获取所有文档。响应如下。

{
 "_embedded": {
    "people": [{
            "firstName": "N1",
            "lastName": "N2",
            "_links": {
                "self": {
                    "href": "http://localhost:8080/people/59d54d2bb13148a7e93953c8"
                },
                "person": {
                    "href": "http://localhost:8080/people/59d54d2bb13148a7e93953c8"
                }
            }
        }
 }

仅获取个人文档的最佳方法是使用一些 json 解析 api，例如 shell 脚本中的 jq 或 java 中的 gson/jackson 等。

希望这会有所帮助。