使用Intellij Idea创建spring boot+mybatis+MyBatis Generator

MyBatis Generator生成代码的几种方式： https://blog.csdn.net/qq_32786873/article/details/78226925
https://www.jianshu.com/p/85b2e1243dfc
1.选择Spring initializr,其他默认，点击下一步

2.项目配置

Group：对应pom文件中的groupId，项目组织的唯一标识，对应Java包的结构
Artifact：对应pom文件的artifactId，项目唯一标识，对应项目名称
Type：Maven构建的，选择第一个Maven Project
Packaging：打包类型，打包成Jar文件
Java Version：jdk版本，选择1.8
Language：开发语言，选择Java
Version：项目版本，对应pom文件的version
name:项目名称
Description：项目描述，对应pom文件的description
Package：包名
3.选择spring boot版本

4.填写项目名称，项目存放目录，点击Finish完成

5.删除下面三个无关的文件

6.最后的项目结构

查看自动生成的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.example</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>1.5.6.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>
    </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-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>

7.新建一个controller测试

@RestController
public class HelloController {
    @RequestMapping(value = "/hello")
    public String hello(){
        return "hello spring boot";
    }
}

@RestController的意思就是controller里面的方法都一json格式输出
8.启动DemoApplication

9.到浏览器中输入 http://localhost:8080/hello

至此一个spring boot项目创建完毕
10.接下来在pom.xml文件中加入mysql，mybatis和mybaits generator依赖

<?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.dwzzb</groupId>
    <artifactId>dwzzb</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>dwzzb</name>
    <description>dwzzb web project</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.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>
    </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-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.21</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!-- mybatis 代码生成器插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.21</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>


</project>

11.在配置文件application.properties中加入数据库的配置信息

spring.datasource.url=jdbc:mysql://localhost:3306/dbname
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

12.创建generatorConfig.xml文件

<?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>
    <!--导入属性配置-->
    <properties resource="application.properties"></properties>
    <!--指定特定数据库的jdbc驱动jar包的位置-->
    <!--<classPathEntry location="${jdbc.driverLocation}"/>-->
    <context id="default" targetRuntime="MyBatis3">
        <!-- optional，旨在创建class时，对注释进行控制 -->
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--jdbc的数据库连接 -->
        <jdbcConnection
                driverClass="${spring.datasource.driver-class-name}"
                connectionURL="${spring.datasource.url}"
                userId="${spring.datasource.username}"
                password="${spring.datasource.password}">
        </jdbcConnection>
        <!-- 非必需，类型处理器，在数据库类型和java类型之间的转换控制-->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- Model模型生成器,用来生成含有主键key的类，记录类 以及查询Example类
            targetPackage     指定生成的model生成所在的包名
            targetProject     指定在该项目下所在的路径
        -->
        <javaModelGenerator targetPackage="com.dwzzb.entities"
                            targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="false"/>
            <!-- 是否对model添加 构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否对类CHAR类型的列的数据进行trim操作 -->
            <property name="trimStrings" value="true"/>
            <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>
        <!--Mapper映射文件生成所在的目录 为每一个数据库的表生成对应的SqlMap文件 -->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="src/main/resources">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>
        <!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件 的代码
                type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
                type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
                type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口-->
        <javaClientGenerator targetPackage="com.dwzzb.dao"
                             targetProject="src/main/java" type="XMLMAPPER">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <table tableName="advertisement" domainObjectName="Advertisement"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
        </table>
    </context>
</generatorConfiguration>

注意注释的部分<classPathEntry location="${jdbc.driverLocation}"/>，这里原本是需要数据库驱动的绝对地址，有些配置是这样写的

<!-- 指定mysql的驱动包 --> 
    <classPathEntry location="D:\m2\mysql\mysql-connector-java\5.1.22/mysql-connector-java-5.1.22.jar" />

这边已经把对jar包的依赖的classPathEntry配置移到pom中，上面有完整的pom配置。
13.添加一个“RUN运行”，使用maven运行mybatis-generator-maven-plugin插件
点击菜单run中的Edit Configurations，然后点“+”，添加maven，设置如下

14.在run菜单中选择generator

点击绿色小箭头运行

"C:\Program Files\Java\jdk1.8.0_111\bin\java" -Dmaven.multiModuleProjectDirectory=D:\Project\JavaWeb\dwzzb_backend "-Dmaven.home=D:\Program_Files\JetBrains\IntelliJ IDEA 2017.1.2\plugins\maven\lib\maven3" "-Dclassworlds.conf=D:\Program_Files\JetBrains\IntelliJ IDEA 2017.1.2\plugins\maven\lib\maven3\bin\m2.conf" "-javaagent:D:\Program_Files\JetBrains\IntelliJ IDEA 2017.1.2\lib\idea_rt.jar=60424:D:\Program_Files\JetBrains\IntelliJ IDEA 2017.1.2\bin" -Dfile.encoding=UTF-8 -classpath "D:\Program_Files\JetBrains\IntelliJ IDEA 2017.1.2\plugins\maven\lib\maven3\boot\plexus-classworlds-2.5.2.jar" org.codehaus.classworlds.Launcher -Didea.version=2017.1.2 -s D:\Program_Files\apache-maven-3.5.0\conf\maven-repo-settings-ali.xml mybatis-generator:generate -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
Downloading: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-maven-plugin/1.5.6.RELEASE/spring-boot-maven-plugin-1.5.6.RELEASE.pom
Downloaded: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-maven-plugin/1.5.6.RELEASE/spring-boot-maven-plugin-1.5.6.RELEASE.pom (0 B at 0.0 KB/sec)
Downloading: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-tools/1.5.6.RELEASE/spring-boot-tools-1.5.6.RELEASE.pom
Downloaded: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-tools/1.5.6.RELEASE/spring-boot-tools-1.5.6.RELEASE.pom (0 B at 0.0 KB/sec)
Downloading: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-maven-plugin/1.5.6.RELEASE/spring-boot-maven-plugin-1.5.6.RELEASE.jar
Downloaded: http://maven.aliyun.com/nexus/content/groups/public/org/springframework/boot/spring-boot-maven-plugin/1.5.6.RELEASE/spring-boot-maven-plugin-1.5.6.RELEASE.jar (0 B at 0.0 KB/sec)
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building demo 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- mybatis-generator-maven-plugin:1.3.2:generate (default-cli) @ dwzzb ---
[INFO] Connecting to the Database
[INFO] Introspecting table advertisement
log4j:WARN No appenders could be found for logger (org.mybatis.generator.internal.db.DatabaseIntrospector).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[INFO] Generating Record class for table advertisement
[INFO] Generating Mapper Interface for table advertisement
[INFO] Generating SQL Map for table advertisement
[INFO] Saving file AdvertisementMapper.xml
[INFO] Saving file Advertisement.java
[INFO] Saving file AdvertisementMapper.java
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.850 s
[INFO] Finished at: 2017-08-12T08:55:22+08:00
[INFO] Final Memory: 15M/166M
[INFO] ------------------------------------------------------------------------

Process finished with exit code 0

看到Build success之后，你会看到generator帮你生成好了dao，model和mapper文件

image.png

完！