Spring @ResponseBody Jackson JsonSerializer 与 JodaTime

使用Spring框架开发Web应用程序时，我们经常需要将Java对象转换为JSON格式的数据，并将其作为HTTP响应返回给客户端。在这种情况下，我们可以使用Spring提供的@ResponseBody注解来指示控制器方法返回的是JSON数据。

java
@RestController
public class UserController {
    @GetMapping("/user/{id}")
    public User getUserById(@PathVariable Long id) {
        User user = userService.getUserById(id);
        return user;
    }
}

java
public class DateTimeSerializer extends JsonSerializer {
    private static final DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
    @Override
    public void serialize(DateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        gen.writeString(formatter.print(value));
    }
}

java
public class User {
    private Long id;
    private String name;
    @JsonSerialize(using = DateTimeSerializer.class)
    private DateTime createdTime;
    // getters and setters
}

xml
    org.springframework.boot
    spring-boot-starter-web
    com.fasterxml.jackson.datatype
    jackson-datatype-joda

java
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}
@RestController
public class UserController {
    @GetMapping("/user/{id}")
    public User getUserById(@PathVariable Long id) {
        User user = userService.getUserById(id);
        return user;
    }
}

java
public class User {
    private Long id;
    private String name;
    @JsonSerialize(using = DateTimeSerializer.class)
    private DateTime createdTime;
    // getters and setters
}

bash
GET http://localhost:8080/user/1