用IDEA搭建一个简单的spring boot用例

用IDEA搭建spring boot用例现在看来其实是非常简单的，不用什么繁杂的配置。

首先创建一个spring boot的项目，如下图所示：

这样就简单的创建了一下spring boot的项目。

然后配置一下pom.xml文件

<?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.myboot.one</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

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

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.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>
		<mybatis-spring-boot>1.2.0</mybatis-spring-boot>
		<mysql-connector>5.1.39</mysql-connector>
	</properties>

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

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

		<!-- Spring Boot Mybatis 依赖 -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>${mybatis-spring-boot}</version>
		</dependency>

		<!-- MySQL 连接驱动依赖 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql-connector}</version>
		</dependency>

		<!-- Junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
		</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>

接下来创建一些必要的文件：

分别是dao层、service层、controller层、其中的CityDao.java和资源文件的CityMapper.xml文件相对应。

接下来配置application.properties文件

# 服务接口配置
server.port=8081
## 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/bootdb?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456dasdsa
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

## Mybatis 配置
mybatis.typeAliasesPackage=com.myboot.one.domain
mybatis.mapperLocations=classpath:mapper/*.xml

然后启动项目，一个简单spring boot项目就完成了。

其中有一个需要注意的点就是在DemoApplication.java类中要加上扫描注解

package com.spring.myboot;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
// mapper 接口类扫描包配置
@MapperScan("com.spring.myboot.dao")
public class DemoApplication {

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