Spring Boot 和 MongoDB - 如何保存日期

Question

我已经按照 Spring.io 指南使用 rest 访问 MongoDB 数据（https://spring.io/guides/gs/accessing-mongodb-data-rest/）并且可以将文档保存到 mongo 中。

当我尝试将日期字段添加到 POJO 并将日期设置为new Date()对象时，它只是在保存到 mongo 时将该值保存为 null。

我创建了一个非常基本@RestController的工作正常（传入请求正文，并使用我的MongoRepository类将其保存），通过其余控制台保存文档。我尝试在此处创建一个新日期并在将其保存到 Mongo 之前进行设置，但这给了我类似"createdDate": 1472394366324.

我可以将日期作为字符串保存到 Mongo 中，但我想要的是能够以日期格式保存日期，以便我可以使用基本的“日期之间”查询来查询它们（所以像这样，确切的格式不会很重要 - "date" : ISODate("2014-02-10T10:50:42.389Z")。我可以编写查询以通过参数获取值，但是要使“日期之间”查询工作，我需要能够将日期值存储到 Mongo 中。

实现这一目标的最简单方法是什么？

编辑：

Pojo类-

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.format.annotation.DateTimeFormat;

import java.util.Date;

@Document(collection = "Musicians")
public class Musician {

@Id
private String id;

private String firstName;
private String lastName;

@DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
private Date createdDate = new Date();

public Musician() {}

public Musician(String firstName, String lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
    //createdDate = new Date();
}

public String getFirstName() {
    return firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getLastName() {
    return lastName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

public Date getCreatedDate() {
    return createdDate;
}

public void setCreatedDate(Date createdDate) {
    this.createdDate = createdDate;
}
}

RestController 类 -

@RestController
@RequestMapping(value = "/musicians")
public class MusicianController {

@Autowired
MusicianRepository musicianRepository;

@Autowired
MongoTemplate mongoTemplate;

@RequestMapping(method = RequestMethod.POST, value = "")
public ResponseEntity<HttpStatus> createMusician(@RequestBody Musician musician) {
    Musician musicianIn = musician;

    musicianRepository.save(musicianIn);

    return new ResponseEntity(HttpStatus.ACCEPTED);
}

@RequestMapping(method = RequestMethod.GET, value = "")
public ResponseEntity<List<Musician>> getMusicians() {
    List<Musician> musicians = musicianRepository.findAll();

    return new ResponseEntity<List<Musician>>(musicians, HttpStatus.OK);
}
}

Answer 1

我在本地 mongodb 中尝试过，它有效。

您可以尝试以下操作吗？

package com.mongo.examples;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.bson.BsonDocument;
import org.bson.Document;
import org.bson.conversions.Bson;

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;

public class MongoDateTest {

    public static void main(String args[]){

        MongoClient mongoClient = new MongoClient("localhost",27017);
        MongoDatabase database = mongoClient.getDatabase("testdates");

        MongoCollection<Document> collection = database.getCollection("dts");
        collection.drop();
        List<Document> insertList = new ArrayList<Document>();
        Date date = new Date();
        Document document = new Document().
                append("_id", 20).append("date",date);
        insertList.add(document);
        collection.insertMany(insertList);
        System.out.println(collection.count());
        MongoCursor<Document> doc = collection.find(new Document("date", date)).iterator();
        System.out.println(doc.next().getDate("date"));
    }
}