如何在springboot中连接到MongoDB？

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

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=mydatabase

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

@Document(collection = "users")
public class User {
    @Id
    private String id;
    private String name;
    private int age;
    
    // 省略getter和setter方法
}

import org.springframework.data.mongodb.repository.MongoRepository;

public interface UserRepository extends MongoRepository<User, String> {
    // 可以在这里定义自定义的查询方法
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    private final UserRepository userRepository;
    
    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }
    
    public void saveUser(User user) {
        userRepository.save(user);
    }
    
    // 其他操作方法
}