Spring Boot整合MyBatis（一）

1.pom.xml引入

      <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </dependency>

       <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <!-- <version>5.1.41</version>-->
            <version>8.0.15</version>
        </dependency>

        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!--mapper-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>1.2.4</version>
        </dependency>

        <!--pagehelper-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
            <scope>compile</scope>
            <optional>true</optional>
        </dependency>

2.application.properties配置

#mybatis
#生成的pojo所在位置
mybatis.type-aliases-package=com.vi.pojo
#生成的xml文件所在位置
mybatis.mapper-locations=classpath:mapper/*.xml

#mapper
#mappers 多个接口时逗号隔开
#通用Mapper位置
mapper.mappers=com.vi.utils.MyMapper
mapper.not-empty=false
#方言
mapper.identity=MYSQL

#pagehelper 分页插件
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql


#配置数据源
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/ichat?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.druid.initial-size=1
spring.datasource.druid.min-idle=1
spring.datasource.druid.max-active=20
spring.datasource.druid.test-on-borrow=true
spring.datasource.druid.stat-view-servlet-allow=true

3.generatorConfig.xml

<?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="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
        <property name="javaFileEncoding" value="UTF-8"/>
        <!--配置是否使用通用 Mapper 自带的注释扩展，默认 true-->
        <!--<property name="useMapperCommentGenerator" value="false"/>-->

        <!--通用 Mapper 插件，可以生成带注解的实体类-->
        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">
            <property name="mappers" value="com.vi.utils.MyMapper"/><!-- 通用mapper所在位置-->
            <property name="caseSensitive" value="true"/>
            <property name="forceAnnotation" value="true"/>
            <property name="beginningDelimiter" value="`"/>
            <property name="endingDelimiter" value="`"/>
            <!--配置是否启用lombok, 支持如下6种注解-->
            <!--当配置 Data 后，Getter Setter ToString EqualsAndHashCode 会被忽略-->
            <property name="lombok" value="Getter,Setter,Data,ToString,Accessors,EqualsAndHashCode"/>
        </plugin>

        <!-- 数据源配置-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/ichat"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <!--MyBatis 生成器只需要生成 Model, 生成的pojo所在位置-->
        <javaModelGenerator targetPackage="com.vi.pojo" targetProject="src/main/java"/>

        <!-- 生成的mapper所在目录-(xml)->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>

        <!-- 生成的mapper对应的java映射-->
        <javaClientGenerator targetPackage="com.vi.mapper" targetProject="src/main/java" type="XMLMAPPER"/>


        <table tableName="sys_user">
            <generatedKey column="id" sqlStatement="JDBC"/>
        </table>
    </context>
</generatorConfiguration>

4.GeneratorDisplay.java

package com.vi.utils;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

public class GeneratorDisplay {

    public void generator() throws Exception{

        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        //指定 逆向工程配置文件
        File configFile = new File("generatorConfig.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);

    }

    public static void main(String[] args) throws Exception {
        try {
            GeneratorDisplay generatorSqlmap = new GeneratorDisplay();
            generatorSqlmap.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

5.通用MyMapper

package com.vi.utils;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
}

运行GeneratorDisplay.java 即可生成对应的pojo,xml,mapper文件
我的项目结构如下：