Jackson 日期格式化技巧
使用 Spring Boot 时，需要使用 Jackson 处理一些 Java Time API 类型的 JSON 序列化问题，在处理一些类的字段时，可以通过直接在属性上加注解的方式来指定其格式化样式。但是，昨天同事遇到一个格式化 Map 数据的问题，这样就不能通过加注解来解决格式化样式的问题了。
在网上各种搜索，各种尝试后，终于解决了这个问题，记录一下，以备不时之需。
闲言少叙，直接上代码：
package com.diguage.demo.config;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.util.StdDateFormat;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import static com.fasterxml.jackson.databind.SerializationFeature.*;
import static java.time.format.DateTimeFormatter.ofPattern;
/<strong>
* 配置类
*
* @author D瓜哥 · <a href="https://www.diguage.com/" rel="external nofollow" rel="external nofollow" >https://www.diguage.com</a>
*/
@Configuration
public class Config {
/</strong>
* 创建 ObjectMapper 对象，配置日期格式化
*
* @author D瓜哥 · <a href="https://www.diguage.com/" rel="external nofollow" rel="external nofollow" >https://www.diguage.com</a>
*/
@Bean
@Primary
public ObjectMapper objectMapper() {
ObjectMapper mapper = new ObjectMapper();
String dateTimepattern = "yyyy-MM-dd HH:mm:ss";
String datePattern = "yyyy-MM-dd";
DateFormat dateFormat = new SimpleDateFormat(dateTimepattern);
mapper.setDateFormat(dateFormat);
mapper.configure(WRITE_DATES_AS_TIMESTAMPS, false);
mapper.setDateFormat(new StdDateFormat().withColonInTimeZone(true));
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addDeserializer(LocalDate.class,
new LocalDateDeserializer(ofPattern(datePattern)));
javaTimeModule.addSerializer(LocalDate.class,
new LocalDateSerializer(ofPattern(datePattern)));
javaTimeModule.addDeserializer(LocalDateTime.class,
new LocalDateTimeDeserializer(ofPattern(dateTimepattern)));
javaTimeModule.addSerializer(LocalDateTime.class,
new LocalDateTimeSerializer(ofPattern(dateTimepattern)));
mapper.registerModule(javaTimeModule);
return mapper;
}
}后续问题
不知道通过这种方式指定日期格式化样式后，在处理一些打格式化样式注解的字段时，会有什么样的表现？有机会测试一下。
补充：Jackson 统一配置 日期转换格式
方式一:配置文件yml中配置
spring:
jackson:
default-property-inclusion: ALWAYS
time-zone: GMT+8
date-format: yyyy-MM-dd HH:mm:ss
这样序列化后，Date类型会被格式化成配置中的格式。
方式二:配置类中配置创建JacksonConfig.java
@Configuration
public class JacksonConfig {
@Bean
@Order(Ordered.HIGHEST_PRECEDENCE)
public Jackson2ObjectMapperBuilderCustomizer customJackson() {
return new Jackson2ObjectMapperBuilderCustomizer() {
@Override
public void customize(Jackson2ObjectMapperBuilder builder) {
builder.serializerByType(LocalDateTime.class,
new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
builder.serializerByType(LocalDate.class,
new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
builder.serializerByType(LocalTime.class,
new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
builder.deserializerByType(LocalDateTime.class,
new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
builder.deserializerByType(LocalDate.class,
new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
builder.deserializerByType(LocalTime.class,
new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
builder.serializationInclusion(JsonInclude.Include.NON_NULL);
builder.failOnUnknownProperties(false);
builder.featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
}
};
}
}参考资料
Jackson Date
json - Java 8 LocalDate Jackson format
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