本人学习后端快一年了，今天和大家分享一下我们这个Spring boot 项目的基本搭建，如果所说有误，请多多指教。在数据库建好之后，我们就需要和通过接口和数据库建立连接，下面我就已建立一个学生抽题系统为列子和大家一起共同学习一下。
第一步：打开你的IDE，即eclipse或者sts，我个人用的sts，打开集成器之后，我们右键点击空白处，
这篇文章我们选择spring boot项目（点击other），
接下来选择Maven和jar包
一路next，接下来就是加入依赖项的时候了，
其实随便勾画几个想要的就好了，之后需要我们单独加入依赖项就好了，好了，接下来就是finish了，
如果你的界面和我一样，那我们接着往下面看，框架不一样的话你可以重复之前的步骤。
接下来我需要一款插件和数据库之间建立一个链接，自动生成mapper，和dao层，它就是
generatorConfig.xml。
（其实下载一款插件就好了，（mybatis-generator）同时我们建立pojo、dao和mapper如图所示：
下面我把代码贴出来
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="test" targetRuntime="MyBatis3">
<plugin type="org.mybatis.generator.plugins.EqualsHashCodePlugin"></plugin>
<plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
<plugin type="org.mybatis.generator.plugins.ToStringPlugin"></plugin>
<commentGenerator>
<!-- 这个元素用来去除指定生成的注释中是否包含生成的日期 false:表示保护 -->
<!-- 如果生成日期，会造成即使修改一个字段，整个实体类所有属性都会发生变化，不利于版本控制，所以设置为true -->
<property name="suppressDate" value="true" />
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--数据库链接URL，用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1/courseexamsys?characterEncoding=utf8" userId="root" password="5120162108">
</jdbcConnection>
<javaTypeResolver>
<!-- This property is used to specify whether MyBatis Generator should
force the use of java.math.BigDecimal for DECIMAL and NUMERIC fields, -->
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- 生成模型的包名和位置 -->
<javaModelGenerator targetPackage="cn.gdc.courseSys.pojo"
targetProject="src/main/java">
<property name="enableSubPackages" value="true" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- 生成映射文件的包名和位置 -->
<sqlMapGenerator targetPackage="mapper"
targetProject="src/main/resources/mybatis">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<!-- 生成DAO的包名和位置 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="cn.gdc.courseSys.dao"
implementationPackage="cn.gdc.courseSys.dao"
targetProject="src/main/java">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<!-- 要生成哪些表 -->
<!-- -->
<table tableName="classestbl" domainObjectName="classesMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
<table tableName="coursetbl" domainObjectName="courseMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
<table tableName="examtbl" domainObjectName="examMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
<table tableName="questionbanktbl" domainObjectName="questionbankMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
<table tableName="questiontbl" domainObjectName="questionMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
<table tableName="scoretbl" domainObjectName="scoreMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
<table tableName="studentstbl" domainObjectName="studentsMapper"
enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false"
selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>
如果说你下载的插件那么你可以直接运行generator配置文件Run mybatis generator，如果你是直接手动添加的xml配置文件
那么你可以右键运行项目，run->maven build->输入 mybatis-generator:generate。
下面我把pom.xml的依赖项附上 ，如果你的run不了，用我的试试，Run之前一定要Maven Project
<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>cn.gdc</groupId> <artifactId>CourseSys</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> </parent> <properties> <java.version>1.8</java.version> <swagger.version>2.7.0</swagger.version> <google.guava>23.0</google.guava> <commons-lang3>3.7</commons-lang3> <fastjson.version>1.2.41</fastjson.version> <quartz.version>2.3.0</quartz.version> <druid.version>1.1.6</druid.version> <poi.version>3.17</poi.version> </properties> <dependencies> <!-- spring boot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-mail</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> <!-- easy poi --> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-base</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-web</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>cn.afterturn</groupId> <artifactId>easypoi-annotation</artifactId> <version>3.1.0</version> </dependency> <!-- mybatis --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>org.mybatis.caches</groupId> <artifactId>mybatis-ehcache</artifactId> <version>1.1.0</version> </dependency> <!-- 测试 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.mockito</groupId> <artifactId>mockito-all</artifactId> <version>1.9.5</version> <scope>test</scope> </dependency> <!-- 通用处理函数 --> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>${google.guava}</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>${commons-lang3}</version> </dependency> <!-- <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> --> <!-- Json 处理 --> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>${fastjson.version}</version> </dependency> <!-- 摘要运算、编码 --> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> </dependency> <!-- mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <!-- 数据库连接池 druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> <!-- swagger2 --> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>${swagger.version}</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-bean-validators</artifactId> <version>${swagger.version}</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>${swagger.version}</version> </dependency> <!-- 定时任务 --> <dependency> <groupId>org.quartz-scheduler</groupId> <artifactId>quartz</artifactId> <version>${quartz.version}</version> </dependency> <!-- <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>${poi.version}</version> </dependency> --> <!-- JWT token --> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt</artifactId> <version>0.9.0</version> </dependency> <!-- 分页信息 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>4.1.6</version> </dependency> <!-- 验证码 --> <dependency> <groupId>cn.apiclub.tool</groupId> <artifactId>simplecaptcha</artifactId> <version>1.2.2</version> </dependency> <!-- 热部署 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <optional>true</optional> </dependency> <!-- catch --> <dependency> <groupId>net.sf.ehcache</groupId> <artifactId>ehcache-core</artifactId> <version>2.6.9</version> </dependency> <!-- <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.16.18</version> <scope>provided</scope> </dependency> --> </dependencies> <build> <pluginManagement> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- maven打包的时候告诉maven不需要web.xml,否刚会报找不到web.xml错误 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <configuration> <skip>true</skip> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.7</source> <target>1.7</target> </configuration> <version>3.3</version> </plugin> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <dependencies> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.35</version> </dependency> </dependencies> </plugin> </plugins> </pluginManagement> </build></project>
好了，现在你运行之后的结果肯定和我是一样的了，
剩下就只有两步了，第一配置mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL Map Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="cacheEnabled" value="true" /><!-- 全局映射器启用缓存 -->
<setting name="useGeneratedKeys" value="true" />
<setting name="defaultExecutorType" value="REUSE" />
</settings>
<!-- <plugins>
<plugin interceptor="com.github.pagehelper.PageHelper">
设置数据库类型 Oracle,Mysql,MariaDB,SQLite,Hsqldb,PostgreSQL六种数据库
<property name="dialect" value="mysql"/>
</plugin>
</plugins>
-->
</configuration>
第二：配置application.properties
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/courseexamsys?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&useSSL=false&serverTimezone=UTC spring.datasource.username=root spring.datasource.password=数据库密码 spring.datasource.driver-class-name=com.mysql.jdbc.Driver #server.port=8080 mybatis.config-location=classpath:mybatis/mybatis-config.xml mybatis.mapper-locations=classpath:mybatis/Mapper/**/*.xml
最后直接Run as ->Spring Boot App项目就成功启动了，接下来我们即可以看见
