springboot中如何配置LocalDateTime JSON返回时间戳
作者：jamesluozhiwei
这篇文章主要介绍了springboot中如何配置LocalDateTime JSON返回时间戳问题。具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
springboot配置LocalDateTime JSON返回时间戳
方案一
创建配置类
注意：使用这种方式，所有Controller的JSON数据返回，只要是LocalDateTime类型都会被转成时间戳
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
/**
* @author jamesluozhiwei
* @date 2019/12/18
*/
@Configuration
public class LocalDateTimeSerializerConfig {
/**
* 序列化LocalDateTime
* @return
*/
@Bean
@Primary
public ObjectMapper serializingObjectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
JavaTimeModule javaTimeModule = new JavaTimeModule();
javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer());
objectMapper.registerModule(javaTimeModule);
return objectMapper;
}
/**
* 序列化实现
*/
public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)
throws IOException {
if (value != null){
long timestamp = value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
gen.writeNumber(timestamp);
}
}
}
/**
* 反序列化实现
*/
public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
@Override
public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)
throws IOException {
long timestamp = p.getValueAsLong();
if (timestamp > 0){
return LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp),ZoneId.systemDefault());
}else{
return null;
}
}
}
}方案二
和方案一 一样都是实现序列化和反序列化接口
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
/**
* @author jamesluozhiwei
* @date 2019/12/18
*/
@Configuration
public class LocalDateTimeSerializerConfig {
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
return builder -> {
builder.serializerByType(LocalDateTime.class, new LocalDateTimeSerializer());
builder.deserializerByType(LocalDateTime.class,new LocalDateTimeDeserializer());
};
}
/**
* 序列化
*/
public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
@Override
public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)
throws IOException {
if (value != null){
long timestamp = value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
gen.writeNumber(timestamp);
}
}
}
/**
* 反序列化
*/
public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
@Override
public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)
throws IOException {
long timestamp = p.getValueAsLong();
if (timestamp > 0){
return LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp),ZoneId.systemDefault());
}else{
return null;
}
}
}
}springboot中的时间以Json返回格式不正确的解决
如果后端数据库存储时间类型的数据使用了datetime类型，那么后端查出来的数据就是LocalDateTime类型，此时若以Json传给前端，那么前端接收到的时间里就会有“T”，此时只要在传参上加上标签即可：
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss") private LocalDateTime createTime;
而如果传给前端的是LocalDate的时间类型，前端接收到的时间也是不正常的，此时需要加上标签处理：
@JsonFormat(pattern = "yyyy-MM-dd") private LocalDate bizTime;
如果以上方法还是不能解决问题，可尝试使用：
@JSONField(format="yyyy-MM-dd HH:mm:ss")
总结
如果你有更好的方法，可以相互讨论学习一下~
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。