Jackson:使用单个条目序列化/反序列化字符串到数组 [英] Jackson: Serializing/Deserializing String to Array with single entry
问题描述
我目前正在编写一个使用Restlet软件包及其Jackson扩展程序来使用RESTful服务的Java客户端。
我想查询用户的服务,并将响应反序列化为用户
POJO,如下所示:
I am currently writing a Java client that consumes a RESTful service, using the Restlet package and its Jackson extension.
I want to query the service for a user and deserialize the response to a User
POJO that looks as follows:
@JsonIgnoreProperties(ignoreUnknown=true)
public class User {
private Integer uid;
private String name;
private String mail;
private String field_nickname;
// omitted for brevity: getters/setters, toString
}
该服务的样本回复如下:
A sample response from the service looks as follows:
{
"uid": "5",
"name": "John Doe",
"mail": "john@example.com",
"field_nickname": {
"und": [{
"value": "jdoe",
"format": null,
"safe_value": "jdoe"
}]
}
}
以下是Java客户端代码:
Here is the Java client code:
import org.restlet.resource.ClientResource;
public class TestClient {
public static void main(String[] args) throws Exception {
// Getting a User
ClientResource cr = new ClientResource("http://localhost/rest/user/7.json")
User user = cr.get(User.class);
System.out.println(user);
// Creating a User
cr = new ClientResource("http://localhost/rest/user.json");
User user = new User();
user.setName("Jane Doe");
user.setFieldNick("jdoe2");
user.setMail("jdoe2@example.com");
cr.post(user);
}
uid的序列化/反序列化
, name
和 mail
字段非常简单,没有任何问题。
我的问题是 field_nickname
:该字段始终包含数组 und
,其中包含一个始终显示的条目同样。
The serialization/deserialization of the uid
, name
and mail
fields is very straightforward and poses no problems.
My problem is with field_nickname
: The field always contains the array und
with a single entry that always looks the same.
如何告诉Jackson将此字段反序列化为 String
,其值为 field_nickname [und] [0] [value]
并将属性序列化为这样的数组?
How can I tell Jackson to deserialize this field to a String
that holds the value of field_nickname[und][0][value]
and serialize the attribute into such an array?
推荐答案
这是一种一次性的结构转换,你需要编写自己的处理程序。最简单的方法可能只是实现类似的东西:
This is kind of one-off structural transformation that you will need to write your own handler. The easiest way is probably just to implement something like:
@JsonProperty("field_nickname")
public void setNickname(NicknameWrapper[] wrapper) {
field_nickname = wrapper[0].value;
}
@JsonIgnoreProperties(ignoreUnknown=true)
static class NicknameWrapper {
public String value;
}
也可能反转(getNickname())。
and perhaps reverse (getNickname()) as well.
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