摘要：如果你想自定義一些查詢，比如根據來查詢，獲取根據來查詢，只需要定義一個方法即可。注意嚴格按照存入的的字段對應。測試在的應用程序，加入測試代碼。啟動程序，控制臺打印了測試通過。

這篇文章主要介紹springboot如何整合mongodb。

安裝 MongoDB
jdk 1.8
maven 3.0
idea

在pom文件引入spring-boot-starter-data-mongodb依賴：

    org.springframework.boot
    spring-boot-starter-data-mongodb

如果mongodb端口是默認端口，并且沒有設置密碼，可不配置，sprinboot會開啟默認的。

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

mongodb設置了密碼，這樣配置：

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

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);
    }

}

public interface CustomerRepository extends MongoRepository {

    public Customer findByFirstName(String firstName);
    public List findByLastName(String lastName);

}

寫一個接口，繼承MongoRepository，這個接口有了幾本的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的字段對應。在典型的java的應用程序，寫這樣一個接口的方法，需要自己實現，但是在springboot中，你只需要按照格式寫一個接口名和對應的參數就可以了，因為springboot已經幫你實現了。

@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的應用程序，加入測試代碼。啟動程序，控制臺打印了：

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’]

測試通過。

源碼下載：https://github.com/forezp/Spr...

accessing-data-mongodb