Spring Boot教程第8篇：整合mongodb

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这篇文章主要介绍springboot如何整合mongodb。

准备工作

环境依赖

在pom文件引入spring-boot-starter-data-mongodb依赖：

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


##数据源配置

如果mongodb端口是默认端口，并且没有设置密码，可不配置，sprinboot会开启默认的。

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spring.data.mongodb.uri=mongodb://localhost:27017/springboot-db

mongodb设置了密码，这样配置：

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spring.data.mongodb.uri=mongodb://name:pass@localhost:27017/dbname

定义一个简单的实体

mongodb

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package com.forezp.entity;

import org.springframework.data.annotation.Id;


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);
    }

}

数据操作dao层

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public interface CustomerRepository extends MongoRepository<Customer, String> {

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

}

写一个接口，继承MongoRepository，这个接口有了几本的CURD的功能。如果你想自定义一些查询，比如根据firstName来查询，获取根据lastName来查询，只需要定义一个方法即可。注意firstName严格按照存入的mongodb的字段对应。在典型的java的应用程序，写这样一个接口的方法，需要自己实现，但是在springboot中，你只需要按照格式写一个接口名和对应的参数就可以了，因为springboot已经帮你实现了。

测试

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@SpringBootApplication
public class SpringbootMongodbApplication  implements CommandLineRunner {


	@Autowired
	private CustomerRepository repository;

	public static void main(String[] args) {
		SpringApplication.run(SpringbootMongodbApplication.class, args);
	}


	@Override
	public void run(String... args) throws Exception {
		repository.deleteAll();

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

		// fetch all customers
		System.out.println("Customers found with findAll():");
		System.out.println("-------------------------------");
		for (Customer customer : repository.findAll()) {
			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(repository.findByFirstName("Alice"));

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

在springboot的应用程序，加入测试代码。启动程序，控制台打印了：

Customers found with findAll():
——————————-
Customer[id=58f880f589ffb696b8a6077e, firstName=’Alice’, lastName=’Smith’]
Customer[id=58f880f589ffb696b8a6077f, firstName=’Bob’, lastName=’Smith’]
Customer found with findByFirstName(‘Alice’):
——————————–
Customer[id=58f880f589ffb696b8a6077e, firstName=’Alice’, lastName=’Smith’]
Customers found with findByLastName(‘Smith’):
——————————–
Customer[id=58f880f589ffb696b8a6077e, firstName=’Alice’, lastName=’Smith’]
Customer[id=58f880f589ffb696b8a6077f, firstName=’Bob’, lastName=’Smith’]

测试通过。

源码下载：https://github.com/forezp/SpringBootLearning

参考资料

accessing-data-mongodb

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