(四) spring boot 整合 mongoDB

开发环境
java version "1.8.0_171"
Apache Maven 3.5.4
mongodb-win32-x86_64-2008plus-ssl-4.0.2-signed

在IDEA中创建新项目，直接一路next到下图，选择这一项之后继续直接一路next然后finish

image.png

项目结构如下：

image.png

创建Model类

package com.example.mongodb.model;

import org.springframework.data.annotation.Id;

public class User {
    @Id
    private Long id;

    private String username;
    private Integer age;

    public User(Long id, String username, Integer age) {
        this.id = id;
        this.username = username;
        this.age = age;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }


}

创建仓储类

package com.example.mongodb.repository;

import com.example.mongodb.model.User;
import org.springframework.data.mongodb.repository.MongoRepository;

public interface UserRepository extends MongoRepository<User, Long> {

    User findByUsername(String username);

}

测试类：

package com.example.mongodb;

import com.example.mongodb.model.User;
import com.example.mongodb.repository.UserRepository;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MongodbApplicationTests {

    @Autowired
    private UserRepository userRepository;

    @Test
    public void contextLoads() {
    }

    @Test
    public void test() throws Exception {

        // 创建三个User，并验证User总数
        userRepository.save(new User(1L, "xiaoming", 30));
        userRepository.save(new User(2L, "xiaohong", 40));
        userRepository.save(new User(3L, "xiaolan", 50));

        System.out.println(userRepository.findAll().size());

    }

}

配置文件application.properties

spring.data.mongodb.uri=mongodb://localhost:27017/test

运行测试类，观察测试结果

image.png

附录 pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>mongodb</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>mongodb</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>