14. Spring Boot MongoDB

14.1. 开始使用MongoDB

14.2. Maven依赖

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<parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.1.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
    </parent>

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

14.3. CRUD

14.3.1. Entity

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package com.example.mongodb.entity;

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

@Document
public class Customer {

    @Id
    public String id;

    public String firstName;
    public String lastName;

    public Customer() {
    }

    public Customer(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    @Override
    public String toString() {
        return String.format("Customer[id=%s, firstName='%s', lastName='%s']", id, firstName, lastName);
    }

}

14.3.2. Repository

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package com.example.mongodb.repository;

import java.util.List;

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

import com.example.mongodb.entity.Customer;

@Repository
public interface CustomerRepository extends MongoRepository<Customer, String> {

public Customer findByFirstName(String firstName);
public List<Customer> findByLastName(String lastName);

}

14.3.3. Service

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package com.example.mongodb.service;

import java.util.List;

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

import com.example.mongodb.entity.Customer;
import com.example.mongodb.repository.CustomerRepository;

@Service
public class CustomerService {

    @Autowired
    private CustomerRepository customerRepository;

    public List<Customer> getCustomers() {
        customerRepository.deleteAll();

        // save a couple of customers
        customerRepository.save(new Customer("Alice", "Smith"));
        customerRepository.save(new Customer("Bob", "Smith"));

        // fetch all customers
        System.out.println("Customers found with findAll():");
        System.out.println("-------------------------------");
        List<Customer> customers = customerRepository.findAll();
        for (Customer customer : customers) {
            System.out.println(customer);
        }
        System.out.println();

        // fetch an individual customer
        System.out.println("Customer found with findByFirstName('Alice'):");
        System.out.println("--------------------------------");
        System.out.println(customerRepository.findByFirstName("Alice"));

        System.out.println("Customers found with findByLastName('Smith'):");
        System.out.println("--------------------------------");
        for (Customer customer : customerRepository.findByLastName("Smith")) {
            System.out.println(customer);
        }
        return customers;

    }

}

14.3.4. RestController

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package com.example.mongodb.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.mongodb.entity.Customer;
import com.example.mongodb.service.CustomerService;

@RestController
public class CustomerController {

    @Autowired
    private CustomerService customerService;

    @GetMapping("/customer")
    public ResponseEntity<List<Customer>> getCustomer(String name) {
        return ResponseEntity.ok(customerService.getCustomers());
    }
}

14.3.5. application.properties

spring.data.mongodb.username=root_app
spring.data.mongodb.password=root123
spring.data.mongodb.database=mymongo
spring.data.mongodb.port=27017
spring.data.mongodb.host=localhost

14.3.6. Mongodb

  1. 访问：http://localhost:8080/customer ， 显示如下:

    [{"id":"5de08e14afacb903cc733ac9","firstName":"Alice","lastName":"Smith"},
{"id":"5de08e14afacb903cc733aca","firstName":"Bob","lastName":"Smith"}]

  2. Mongodb客户端：

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