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
@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’]
———————
