这篇文章主要介绍springboot如何整合MongoDB。

准备工作

安装 MongoDB

jdk 1.8

maven 3.0

idea

环境依赖

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

<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。

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

mongodb设置了密码，这样配置：

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

定义一个简单的实体

mongodb

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

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

@SpringBootApplicationpublic 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

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