如何使用Java从MongoDB中读取日期(时间戳) [英] How to read date (Timestamp) from MongoDB using Java

问题描述

我正尝试以以下格式从MongoDB中读取日期字段

Am trying to read date field from MongoDB in below format

Formate: YYYY-MM-dd HH:mm:ss.SSSSSS

2017-01-23-10.46.07.812000 - DB2
2017-01-23T16:46:07.812Z   - Stored in MongoDB (While viewing from GUI tool)
Mon Jan 23 22:16:07 IST 2017 - Result/Reading from MongoDB

// Formatter for the input date
final DateTimeFormatter inputFormat = DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss zzz yyyy");
final ZonedDateTime dateFiledParsed = ZonedDateTime.parse(dateFiled.toString(), inputFormat);
final DateTimeFormatter outputFormat3 = DateTimeFormatter.ofPattern("YYYY-MM-dd HH:mm:ss.SSSSSS");
System.out.println(outputFormat3.format(publicationDateParsed));

Result: 2017-01-23 22:16:07.000000

结果为2017-01-23 22:16:07. 000 000，而不是000，应该是812(原始值:2017-01-23-10.46.07.812000)

In the result 2017-01-23 22:16:07.000000, instead of 000 it should be the 812 (Original value: 2017-01-23-10.46.07.812000)

注意:使用MongoDB Java驱动程序3.4.

Note: Using MongoDB Java driver 3.4.

提前谢谢！

巴拉提

推荐答案

您可以使用Java的正确的ISODate类型在MongoDB中插入了日期:

You can use Java's SimpleDateFormat to format the date accordingly. For example, assuming you inserted the date in MongoDB using the proper ISODate type:

> db.test.find()
{
  "_id": ObjectId("597813a12dbe1d773beb11d2"),
  "date": ISODate("2017-01-23T16:46:07.812Z")
}

此代码将打印正确的日期:

This code prints the correct date:

Document doc = collection.find().first();
Date date = doc.getDate("date");
SimpleDateFormat formattedDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
formattedDate.setTimeZone(TimeZone.getTimeZone("UTC"));
System.out.println(formattedDate.format(date));

输出为:

2017-01-23 16:46:07.812

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