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-dbmongodb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 {@Idpublic String id;public String firstName;public String lastName;public Customer() {}public Customer(String firstName, String lastName) {this.firstName = firstName;this.lastName = lastName;}@Overridepublic 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
@SpringBootApplication
public class SpringbootMongodbApplication implements CommandLineRunner {@Autowiredprivate CustomerRepository repository;public static void main(String[] args) {SpringApplication.run(SpringbootMongodbApplication.class, args);}@Overridepublic void run(String... args) throws Exception {repository.deleteAll();// save a couple of customersrepository.save(new Customer("Alice", "Smith"));repository.save(new Customer("Bob", "Smith"));// fetch all customersSystem.out.println("Customers found with findAll():");System.out.println("-------------------------------");for (Customer customer : repository.findAll()) {System.out.println(customer);}System.out.println();// fetch an individual customerSystem.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
