springboot 整合mybatis generator 自動生成代碼

記錄一下自己springboot項目使用mybatis generator 自動生成代碼的一個過程，防止忘記。
首先，先生成一個springboot項目，命名爲
pom.xml配置爲

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.teng</groupId>
    <artifactId>testmybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>testmybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <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-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.9</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </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>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration><configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                    <overwrite>true</overwrite>
                    <verbose>true</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

然後在resources目錄下建立generator包，包內建generatorConfig.xml
再在resources目錄下建立mapper包,用來存放映射文件
項目結構爲這樣：

generatorConfig.xml的配置爲：

<?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>
    <!-- 數據庫驅動:選擇你的本地硬盤上面的數據庫驅動包-->
    <classPathEntry  location="D:\Adobe\mysql-connector-java-8.0.11.jar"/>
    <context id="DB2Tables" targetRuntime="MyBatis3">

        <!-- 生成後不帶註釋 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>

        <!-- 配置數據庫連接 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:MySQL://localhost:3306/wechatdata?serverTimezone=UTC"
                        userId="root"
                        password="123456">
            <property name="useInformationSchema" value="true"/>
        </jdbcConnection>

        <javaTypeResolver >
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- 指定javabean生成的位置 -->
        <javaModelGenerator
                targetPackage="com.teng.testmybatis.entity"
                targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!-- 指定sql映射文件生成的位置 -->
        <sqlMapGenerator
                targetPackage="mapper"
                targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!-- 指定dao接口生成的位置，mapper位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.teng.testmybatis.dao"
                             targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- table指定每個表的生成策略 ,爲bean命名-->
        <table tableName="we_user" domainObjectName="User"></table>

    </context>
</generatorConfiguration>

配置application.properties

#配置數據庫
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/wechatdata?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#配置mybatis
mybatis.mapper-locations= classpath:mapper/*.xml
mybatis.configuration.map-underscore-to-camel-case=true

然後在src/java 下建立4個包 entity,dao ,service,controller

然後點擊idea上方的 run ----->Edit Configurations

點擊maven(如果沒有按左上角的+號添加進來)，配置如下

點擊ok後按該運行按鈕，如：

代碼就會自動生成啦，箭頭指的就是自動生成的啦

最後，記得在啓動類中添加@MapperScan註釋

package com.teng.testmybatis;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.teng.testmybatis.dao")
@SpringBootApplication
public class TestmybatisApplication {

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

}

然後你就可以只用對service，和controller進行編碼啦，省下很大一部分寫sql的精力