我有一个日期如下的json文件:
{
...
"dob":"20001010",
"registerdate":"20001010121212",
...
}
我在课堂上使用:
public class User implements Serializable {
... some other
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyyMMdd
public java.util.Date dob; // this works
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyyMMddHHmmss")
public java.util.Date registerdate;
}
然后在我的测试中,我使用Gson来转换文件
User user = new Gson().fromJson("user.json", User.class);
但是当运行时,我得到:
com.google.gson.JsonSyntaxException: 20001010121212
我与:yyyyMMddHHmmss或YYYYMMddHHmmss或YYYYMMDDHHmmss相同
pom:
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
</dependency>
最佳答案
基本上com.google.gson.Gson无法识别注释com.fasterxml.jackson.annotation.JsonFormat(两个不同的库)
这是仅使用fasterxml lib中的ObjectMapper的另一种解决方案
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.Serializable;
import java.util.Date;
public class DemoApplication {
public static void main(String[] args) throws JsonProcessingException {
String json = "{\"dob\":\"20001010121212\"}";
ObjectMapper objectMapper = new ObjectMapper();
User user = objectMapper.readValue(json, User.class);
System.out.println(user.dob);
}
}
class User implements Serializable {
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyyMMddHHmmss")
public Date dob;
}