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企业级 SpringBoot 教程 (八)springboot整合mongodb

准备工作

  • 安装MnongoDB
  • jdk 1.8
  • maven 3.0
  • idea

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);
}
}

  资料和源码来源地址

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