SpringBoot实战系列-SpringBoot 2.0 基础环境搭建

1. SpringBoot 2.0 是什么？

Spring Boot是由Pivotal团队提供的基于Spring的框架，其设计目的是用来简化新Spring应用的初始搭建以及开发过程。SpringBoot 提供了一些非功能性特性，如嵌入式服务器、安全、健康检查、外部化配置等等。目前SpringBoot最新版本为2.0

2. 获取SpringBoot

使用Maven构建工具获取SpringBoot，在Maven的POM.xml文件中添加以下代码

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

编写启动类

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@EnableAutoConfiguration
public class Application {
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

编写Controller

@RestController
public class TestController {

    @GetMapping(value = "test")
    public String test(){
        return "test";
    }
}

在浏览器中输入http://localhost:8080/test，在浏览器中可以看到test文本

3.集成Mybatis

引入mybatis-spring-boot-starter，以及数据库连接池和MySQL驱动

   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>1.3.2</version>
    </dependency>

   <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
   </dependency>

  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.8</version>
  </dependency>     

在resources目录下添加application.properties

server.port=8080


spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT&useSSL=false&autoReconnect=true&failOverReadOnly=false
spring.datasource.username=username
spring.datasource.password=password

spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20

spring.datasource.maxWait=60000

spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=stat,wall,log4j
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

#扫描Mybatis SQL文件
mybatis.mapper-locations=classpath:/mapper/*Mapper.xml

编写Mapper接口和SQL文件

@Mapper
public interface TestMapper {
    /**
     * 返回数据库版本号
     * @return
     */
    String version();
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="me.smile.practice.mapper.TestMapper" >

    <select id="version" resultType="java.lang.String">
        select version()
    </select>

</mapper>

在test目录下通过编写单元测试检测配置是否正确

@SpringBootTest(classes = App.class)
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
public class TestMapperTest {

    @Resource
    private TestMapper testMapper;

    @Test
    public void version() {

        String version = testMapper.version();
        System.out.println(version);
        Assert.assertEquals("5.7.21", version);
    }
}

运行单元测试会在控制台输出当前数据库所使用的版本号。
至此基于SpringBoot2.0的基本开发环境搭建完毕。