在mongoDB数据库中,时间的保存是ISODate类型,orm关系映射为java.util.Date类型,其保存的时间与我们会有8小时的区别(保存的时间比我们早了8个小时)
原数据为:
Person [id=11188, name=doctorwho, age=888888,birth=2016-01-01 13:55:00]
MongoDB数据库中为:
{
"_id" : "11188",
"_class" : "com.doctor.domain.Person",
"name" : "doctorwho",
"age" : NumberInt(888888),
"birth" : ISODate("2016-01-01T05:55:00.000+0000")
}
那我们用时间查询数据的时候,看下java 驱动如何做的:(部分日志):
package com.doctor.springdoc;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.List;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import com.doctor.domain.Person;
import com.mongodb.WriteResult;
/**
* JSONSerializers L205-216有关mongoDB对时间的处理ISODate与我们时区相差8小时(做个时区转换)
*
* @author sdcuike
*
* @time 2015年12月27日 下午10:54:16
*/
public class SavingUpdatingRemovingDocuments {
/**
* @param args
*/
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:/mongoDBConfig/spring-mongoDB.xml");
MongoTemplate mongoTemplate = context.getBean(MongoTemplate.class);
Person person = new Person("doctorwho", 28888, "11188");
LocalDateTime localDateTime = LocalDateTime.of(2016, 1, 1, 13, 55);
ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of("Asia/Shanghai"));
person.setBirth(Date.from(zonedDateTime.toInstant()));
System.out.println(person);
if (mongoTemplate.findById(person.getId(), Person.class) == null) {
mongoTemplate.insert(person);
}
Person findById = mongoTemplate.findById(person.getId(), Person.class);
System.out.println(findById);
List<Person> find = mongoTemplate.find(Query.query(Criteria.where("name").is("doctorwho").and("age").is(28888)), Person.class);
find.forEach(System.out::println);
WriteResult updateMulti = mongoTemplate.updateMulti(Query.query(Criteria.where("age").is(28888)), Update.update("age", 888888), Person.class);
System.out.println(updateMulti.getN());
System.out.println("time query");
List<Person> find2 = mongoTemplate.find(Query.query(Criteria.where("birth").is(person.getBirth())), Person.class);
find2.forEach(System.out::println);
// JSONSerializers L205-216有关mongoDB对时间的处理ISODate与我们时区相差8小时(做个时区转换)
}
}
time query
01-02 22:12:37.195 main DEBUG org.springframework.data.mongodb.core.MongoTemplate - find using query: { "birth" : { "$date" : "2016-01-01T05:55:00.000Z"}} fields: null for class: class com.doctor.domain.Person in collection: person
01-02 22:12:37.196 main DEBUG org.springframework.data.mongodb.core.MongoDbUtils - Getting Mongo Database name=[sdcuike]
Person [id=11188, name=doctorwho, age=888888,birth=2016-01-01 13:55:00]
{ "birth" : { "$date" : "2016-01-01T05:55:00.000Z"}}
查询语句按我们的相差时间查询,返回的数据确实是我们需要的,即使数据库中我们看到的iso date相差8个小时。其实java 驱动帮我们做了转换。
com.mongodb.util.JSONSerializers.LegacyDateSerializer代码:
private static class LegacyDateSerializer extends CompoundObjectSerializer {
LegacyDateSerializer(ObjectSerializer serializer) {
super(serializer);
}
@Override
public void serialize(Object obj, StringBuilder buf) {
Date d = (Date) obj;
SimpleDateFormat format = new SimpleDateFormat(
"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
format.setCalendar(new GregorianCalendar(
new SimpleTimeZone(0, "GMT")));
serializer.serialize(
new BasicDBObject("$date", format.format(d)),
buf);
}
}
在这里,做了时区转换。
GregorianCalendar
来源于:
https://blog.csdn.net/doctor_who2004/article/details/50449561