Java springcloud B2B2C o2o多使用者商城 springcloud架構（八）springboot整合mongodb

準備工作

安裝MongoDB
jdk 1.8
maven 3.0
idea

環境依賴

在pom檔案引入spring-boot-starter-data-mongodb依賴：

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<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-data-mongodb</artifactId>

</dependency>

資料來源配置

如果mongodb埠是預設埠，並且沒有設定密碼，可不配置，sprinboot會開啟預設的。

1	`spring.data.mongodb.uri=mongodb://localhost:27017/springboot-db`

　　mongodb設定了密碼，這樣配置：

1	`spring.data.mongodb.uri=mongodb://name:pass@localhost:27017/dbname`

定義一個簡單的實體

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);

}

資料操作dao層

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public interface CustomerRepository extends MongoRepository<Customer, String> {

public Customer findByFirstName(String firstName);

public List<Customer> findByLastName(String lastName);

}

寫一個介面，繼承MongoRepository，這個介面有了幾本的CURD的功能。如果你想自定義一些查詢，比如根據firstName來查詢，獲取根據lastName來查詢，只需要定義一個方法即可。注意firstName嚴格按照存入的mongodb的欄位對應。在典型的java的應用程式，寫這樣一個介面的方法，需要自己實現，但是在springboot中，你只需要按照格式寫一個介面名和對應的引數就可以了，因為springboot已經幫你實現了。

測試

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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'):");