SpringBoot微服务 b2b2c 多用户商城系统（八）springboot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

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

@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);
        }
    }

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