SpringBoot在IDEA中的配置

一、将Maven项目初始化为SpringBoot项目

1.先创建一个Maven项目（可使用Maven原型创建：maven-archetype-webapp），在pom.xml中配置好<parent>标签和<dependency>标签

<parent>
  <artifactId>spring-boot-starter-parent</artifactId>
  <groupId>org.springframework.boot</groupId>
  <version>2.1.5.RELEASE</version>
</parent>

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-web</artifactId>
</dependency>

2.新建一个Application类，注解为@SpringBootApplication

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

3.在controller包中创建一个Controller进行测试 （@Controller）

Controller默认返回至指定页面，若需返回自定义内容至页面，需加上@ResponseBody注解，或@Controller将改为@RestController

在类上加上@RequestMapping为类相对于根的请求路径，
在方法上加上@RequestMapping为方法相对于类的请求路径
@PostMapping和@GetMapping可以限制@RequestMapping的请求方式

二、连接数据库，添加JDBC与事务

1.@ConfigurationProperties和@Value注解

前者的优势为松散绑定（驼峰，中划线，下划线转换）、对象引导（对象内部的属性注入）

2.添加依赖

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.13</version>
</dependency>
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

3.编写数据库配置（application.properties/yml）

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/*database*?serverTimezone=UTC&characterEncoding=utf-8
    username: root
    password: root

4.创建Service层测试类

先创建一个pojo对象，加上@Data注解可以省去getter和setter方法

@Data
public class User
{
	private String name;
	private String id;
}

在service包下创建Service1类

@Service
public class Service1
{
	@Transactional
	public void saveUser(User user){
		System.out.println("save user");
	}
}

三、修改SpringMVC端口，配置拦截器

1.修改tomcat端口

在application.yml中加入

server:
  port: 80

2.新建一个拦截器，实现HandlerInterceptor接口，并且加入拦截器链

在interceptor包冲创建一个拦截器类

@Slf4j
public class Interceptor1 implements HandlerInterceptor
{
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		log.debug("PreHandle");
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
		log.debug("PostHandle");
	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
		log.debug("AfterHandle");
	}
}

注意，使用@Slf4j需要设置日志级别，在application.yml中加入

#日志记录级别
logging:
  level:
    *target*: debug
    org.springframework: info

在config包中创建一个类，在拦截器链中加入该拦截器

@Configuration
public class MvcConfig implements WebMvcConfigurer
{
	@Bean
	public Interceptor1 interceptor1(){
		return new Interceptor1();
	}

	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(interceptor1()).addPathPatterns("/*");
	}
}

四、整合MyBatis与通用Mapper

1.添加依赖

<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>2.1.4</version>
</dependency>
<dependency>
  <groupId>tk.mybatis</groupId>
  <artifactId>mapper-spring-boot-starter</artifactId>
  <version>2.1.5</version>
</dependency>

2.配置mybatis

在application.yml中加入

mybatis:
  #实体类别名包路径
  type-aliases-package: com.bill.pojo
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3.添加Mapper扫描注解

在Application类上添加@MapperScan("包路径")注解

注意！如果使用tk包中的通用Mapper，MapperScan引用的包应使用同样的包

4.创建Mapper测试类，使用通用Mapper

在mapper包中创建Mapper1类

public interface Mapper1 extends Mapper<User>{}

由于使用通用Mapper，很多常用方法不用写实现

Tips.在pojo类上添加注解

@Data
@Table(name = "user_table")
public class User
{
	private String name;

	//主键、主键回填
	@Id
	@KeySql(useGeneratedKeys = true)
	private String id;
}

Tips.在Service中注入Mapper，在Controller中注入Service，进行测试

五、整合Junit测试

1.添加依赖

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

2.创建测试类

在需要创建测试的类名上按Ctrl+Shift+T，创建一个测试类，并加上注解

@RunWith(SpringRunner.class)
@SpringBootTest
public class Service1Test
{
	@Autowired
	private Service1 service1;

	@Test
	public void queryById() {
		//...
	}
}

3.测试Junit是否能成功运行

如果报错：Could not initialize plugin: interface org.mockito.plugins.MockMaker，可以添加如下依赖

<dependency>
  <groupId>net.bytebuddy</groupId>
  <artifactId>byte-buddy</artifactId>
  <version>1.8.16</version>
</dependency>
<dependency>
  <groupId>net.bytebuddy</groupId>
  <artifactId>byte-buddy-agent</artifactId>
  <version>1.8.16</version>
  <scope>test</scope>
</dependency>

六、整合Redis

1.添加依赖

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

2.在application.yml中添加配置

spring:
  redis:
    host: localhost
    port: 6379

3.添加测试类，注入Redis

@Autowired
private RedisTemplate redisTemplate;

七、附件

1.完整依赖

<parent>
    <artifactId>spring-boot-starter-parent</artifactId>
    <groupId>org.springframework.boot</groupId>
    <version>2.1.5.RELEASE</version>
</parent>

<dependencies>
    <!--Junit测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>

    <!--SpringBoot相关启动器-->
    <!--web-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--jdbc-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <!--mybatis-->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.1.4</version>
    </dependency>
    <!--通用Mapper-->
    <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper-spring-boot-starter</artifactId>
        <version>2.1.5</version>
    </dependency>
    <!--Junit-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>

    <dependency>
        <groupId>net.bytebuddy</groupId>
        <artifactId>byte-buddy</artifactId>
        <version>1.8.16</version>
    </dependency>
    <dependency>
        <groupId>net.bytebuddy</groupId>
        <artifactId>byte-buddy-agent</artifactId>
        <version>1.8.16</version>
        <scope>test</scope>
    </dependency>


    <!--Mysql连接-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.13</version>
    </dependency>


    <!--LOMBOK-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
</dependencies>