详解springboot整合mongodb_Java教程

详解springboot整合mongodb

2020-09-24 15:46方志朋 Java教程

本篇文章主要介绍了详解springboot整合mongodb，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

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。

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

mongodb设置了密码，这样配置：

1	`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']