Java连接MongoDB实例

目录

1 Java连接

1.1 Maven依赖

1.2 客户端代码

2 Spring Boot连接

2.1 Maven依赖

2.2 配置文件

2.3 service层代码

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笔者所用的MongoDB的版本是4.2.6。

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1 Java连接

1.1 Maven依赖

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.12.4</version>
</dependency>

1.2 客户端代码

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.model.Filters;
import org.bson.Document;

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

/**
 * MongoDB客户端
 *
 * @author Robert Hou
 * @date 2020年05月08日 22:35
 **/
public class MongoDBClient {

    private static final String MONGODB_URL = "mongodb://127.0.0.1:27017";

    private MongoDBClient() {
    }

    public static void main(String[] args) {
        MongoClientURI mongoClientURI = new MongoClientURI(MONGODB_URL);
        //取得MongoDB客户端
        MongoClient mongoClient = new MongoClient(mongoClientURI);

        //取得test库下的Product集合
        MongoCollection<Document> collection = mongoClient.getDatabase("test").getCollection("Product");
        //创建文档
        List<Document> documents = new ArrayList<>();
        Document document1 = new Document("Name", "Robert Hou")
                .append("Gender", "Male")
                .append("Tel", "18500000000")
                .append("Location", new Document("City", "Beijing").append("District", "Fengtai"));
        documents.add(document1);
        Document document2 = new Document("Name", "Tony")
                .append("Gender", "Male")
                .append("Tel", "13400000000")
                .append("Location", new Document("Province", "Guangxi").append("City", "Nanning"));
        documents.add(document2);
        collection.insertMany(documents);
        //修改文档内容
        Document document3 = new Document("$set", new Document("Tel", "13400000001"));
        collection.updateMany(Filters.eq("Name", "Tony"), document3);
        //查询全部文档
        for (Document cur : collection.find()) {
            System.out.println(cur.toJson());
        }

        mongoClient.close();
    }
}

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2 Spring Boot连接

2.1 Maven依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

2.2 配置文件

spring.data.mongodb.uri=mongodb://127.0.0.1:27017/test

2.3 service层代码

import com.hys.mongodb.springboot.model.User;
import com.hys.mongodb.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
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 org.springframework.stereotype.Service;

/**
 * 用户接口实现
 *
 * @author Robert Hou
 * @date 2020年05月10日 02:44
 **/
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private MongoTemplate mongoTemplate;

    @Override
    public void saveUser(User user) {
        mongoTemplate.save(user);
    }

    @Override
    public void deleteUserById(Long id) {
        Query query = new Query(Criteria.where("id").is(id));
        mongoTemplate.remove(query, User.class);
    }

    @Override
    public void updateUser(User user) {
        Query query = new Query(Criteria.where("id").is(user.getId()));
        Update update = new Update().set("username", user.getUsername()).set("password", user.getPassword());
        mongoTemplate.updateMulti(query, update, User.class);
    }

    @Override
    public User findUserByUsername(String username) {
        Query query = new Query(Criteria.where("username").is(username));
        return mongoTemplate.findOne(query, User.class);
    }
}