[英]Parse JSON array from a response body using Resteasy and Jackson annotations
I'm using Resteasy with Quarkus, and Jackson annotations ( io.quarkus.quarkus-resteasy
, io.quarkus.quarkus-resteasy-jackson
, version 1.13.2.Final). I'm using Resteasy with Quarkus, and Jackson annotations (
io.quarkus.quarkus-resteasy
, io.quarkus.quarkus-resteasy-jackson
, version 1.13.2.Final).
I need to parse this kind of response from an API I call:我需要解析来自我调用的 API 的这种响应:
[
{
"name": "John Smith",
"age": 43
},
{
"name": "Jane Doe",
"age": 27
}
]
I can't change this response (wrap this array inside an object with a property, for example).我无法更改此响应(例如,将此数组包装在具有属性的 object 中)。 The root element of the response body is an array.
响应正文的根元素是一个数组。
Here is the model class:这是 model class:
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
public class Person {
private final String name;
private final int age;
@JsonCreator
public Person(@JsonProperty("name") String name,
@JsonProperty("age") int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
And here is how I request the API:以下是我请求 API 的方式:
ResteasyClient resteasyClient = new ResteasyClientBuilderImpl().build();
try {
Response response = resteasyClient.target("/api/path")
.queryParam("param1", "value1")
.request()
.get();
List<Perso> person = response.readEntity( /* ? */ );
}
catch (ProcessingException e) {
// Handle the error...
}
I can't use List<Person>.class
in the readEntity
method ( "Cannot select from parameterized type"
).我不能在 readEntity 方法中使用
List<Person>.class
readEntity
"Cannot select from parameterized type"
)。
I tried creating a Persons
wrapper object which contains the list.我尝试创建一个包含列表的
Persons
包装器 object。 But the JSON content in not an object with a list property, it is an array.但是 JSON 内容不是具有列表属性的 object ,它是一个数组。 So it doesn't work.
所以它不起作用。
The readEntity
method has a variant that, instead of a Class
, takes a GenericType
. readEntity
方法有一个变体,它采用GenericType
而不是Class
。 You can use readEntity(new GenericType<List<Person>>() {})
.您可以使用
readEntity(new GenericType<List<Person>>() {})
。
In case you're interested, the GenericType
class uses a clever trick that, to the best of my knowledge, was first described by Neal Gafter in his Super Type Tokens article: http://gafter.blogspot.com/2006/12/super-type-tokens.html如果您有兴趣,
GenericType
class 使用了一个聪明的技巧,据我所知,Neal Gafter 在他的 Super Type Tokens 文章中首次描述了该技巧: http://gafter.blogspot.com/2006/12/超级类型令牌。html
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