SpringBoot实践之---集成mongodb

原文地址：SpringBoot非官方教程 | 第八篇：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

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

@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