[Java知识库]springboot集成mybatis-plus自动生成代码

1.环境说明：
idea ：2019.1.3、jdk：1.8 、maven：3.5.4
2.技术选型
springboot：2.6.2、mybatis-spring-boot-starter：2.2.2、mybatis-plus-boot-starter：3.1.0、mybatis-plus-generator：3.1.1、velocity：1.6.3、druid-spring-boot-starter：1.1.10、fastjson：1.2.31

3. 新建springboot工程，名称根据自己的需要自己定义，创建好后在pom文件中引入所需的依赖

<?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 https://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>2.6.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.yf.cn</groupId>
    <artifactId>act7</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>act7</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.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-spring-boot-starter</artifactId>
            <version>7.1.0.M6</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.google-collections</groupId>
            <artifactId>google-collect</artifactId>
            <version>snapshot-20080530</version>
        </dependency>
        <dependency>
            <groupId>org.activiti</groupId>
            <artifactId>activiti-image-generator</artifactId>
            <version>7.1.0.M6</version>
        </dependency>
        <!--mybatis-plus核心库-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.0</version>
        </dependency>

        <!--代码生成器依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.1.1</version>
        </dependency>

        <!--freemarker
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.28</version>
        </dependency> -->

        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity</artifactId>
            <version>1.6.3</version>
        </dependency>

        <!--自动生成get和set-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!--数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.31</version>
        </dependency>

        <!--分页插件可加可不加，因为MP自带分页功能-->
<!--        <dependency>-->
<!--            <groupId>com.github.pagehelper</groupId>-->
<!--            <artifactId>pagehelper-spring-boot-starter</artifactId>-->
<!--            <version>1.2.12</version>-->
<!--        </dependency>-->

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

4. 编写生成代码工具类MpGenerator

package com.yf.cn.utils;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.converts.MySqlTypeConvert;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.DbColumnType;
import com.baomidou.mybatisplus.generator.config.rules.IColumnType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
import com.baomidou.mybatisplus.generator.engine.VelocityTemplateEngine;

import java.util.ArrayList;
import java.util.List;

public class MpGenerator {
    public static void main(String[] args) throws InterruptedException {

        //用来获取Mybatis-Plus.properties文件的配置信息
        //final ResourceBundle rb = ResourceBundle.getBundle("mybatisplus");

        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        gc.setOutputDir("D:/eclipse-mars/javabasicparent/act7/src/main/java");  //修改成自己的项目路径一直到java
        gc.setFileOverride(true);//覆盖已有文件
        gc.setOpen(false);
        gc.setBaseResultMap(true);
        gc.setBaseColumnList(true);
        gc.setAuthor("yf");
        gc.setMapperName("%sMapper");
        gc.setXmlName("%sMapper.xml");
        gc.setServiceName("%sService");
        gc.setServiceImplName("%sServiceImpl");
        gc.setControllerName("%sController");
        gc.setDateType(DateType.ONLY_DATE);
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setDbType(DbType.MYSQL);
        dsc.setUrl("jdbc:mysql://127.0.0.1:3306/act7?useUnicode=true&characterEncoding=utf8&useSSL=false");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("123456");
        dsc.setTypeConvert(new MySqlTypeConvertCustom());
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.yf.cn");
        //pc.setController("controller");
        pc.setService("service");
        pc.setServiceImpl("service.impl");
        pc.setEntity("pojo");
        pc.setMapper("mapper");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };
        // 如果模板引擎是 freemarker
        //String templatePath = "/templates/mapper.xml.ftl";
        // 如果模板 引擎是 velocity
        String templatePath = "/templates/mapper.xml.vm";
        List<FileOutConfig> focList = new ArrayList<>();
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输入文件名称
                return "D:/eclipse-mars/javabasicparent/act7/src/main/resources" + "/mappers/" + tableInfo.getEntityName() + StringPool.DOT_XML;
            }
        });
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);
        mpg.setTemplate(new TemplateConfig().setXml(null));

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setEntityLombokModel(true);

        //建立不包含哪些表
        //strategy.setExclude(new String[]{rb.getString("tableName")});

        //建立包含哪些表空 为所有表
        strategy.setInclude("sys_user");
        mpg.setStrategy(strategy);
        //mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.setTemplateEngine(new VelocityTemplateEngine());
        mpg.execute();
    }
}

/**
 * 自定义类型转换
 */
class MySqlTypeConvertCustom extends MySqlTypeConvert implements ITypeConvert{
    @Override
    public IColumnType processTypeConvert(GlobalConfig globalConfig, String fieldType) {
        String t = fieldType.toLowerCase();
        if (t.contains("tinyint(1)")) {
            return DbColumnType.INTEGER;
        }
        return super.processTypeConvert(globalConfig, fieldType);
    }
}

5. 修改数据源信息以及设置所要生成的代码对应的表，执行main方法即可生成对应的代码