Mybatis-Plus的代码生成器

1、依赖

1.1、pom.xml

<?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.wnx.mall.tiny</groupId>
    <artifactId>mybatis-plus-sample-crud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis-plus-sample-crud</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--SpringBoot通用依赖模块-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>test@localhost
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--集成druid连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <!--Mysql数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <!--Swagger-UI API文档生产工具-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.7.0</version>
        </dependency>
        <!--lombok依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!--Hutool Java工具包-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.5.7</version>
        </dependency>
        <!--Mybatis-Plus依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.3.2</version>
        </dependency>
        <!--Mybatis-Plus代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.3.2</version>
        </dependency>
        <!--Velocity模板生成引擎-->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.2</version>
        </dependency>
        <!--junit-jupiter-api-->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.8.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

</project>

1.2、application.yaml

server:
  port: 8080

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
    username: root
    password: root

mybatis-plus:
  mapper-locations: classpath:/mapper/**/*.xml
  global-config:
    db-config:
      id-type: auto #数据库主键自增
  configuration:
    auto-mapping-behavior: partial #只会自动映射没有定义嵌套结果集映射的结果集
    map-underscore-to-camel-case: true

logging:
  level:
    root: info
    com.wnx.mall.tiny: debug

2、配置

1.1、generator.properties

dataSource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
dataSource.driverName=com.mysql.cj.jdbc.Driver
dataSource.username=root
dataSource.password=root
package.base=com.wnx.mall.tiny.modules

1.2、MyBatisPlusGenerator

package com.wnx.mall.tiny.mbg;

import cn.hutool.core.util.StrUtil;
import cn.hutool.setting.dialect.Props;
import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
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.po.LikeTable;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.VelocityTemplateEngine;

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

public class MyBatisPlusGenerator {
    public static void main(String[] args) {
        String projectPath = System.getProperty("user.dir") + "/";
        String moduleName = scanner("模块名");
        String[] tableNames = scanner("表名，多个英文逗号分割").split(",");
        // 代码生成器
        AutoGenerator autoGenerator = new AutoGenerator();
        autoGenerator.setGlobalConfig(initGlobalConfig(projectPath));
        autoGenerator.setDataSource(initDataSourceConfig());
        autoGenerator.setPackageInfo(initPackageConfig(moduleName));
        autoGenerator.setCfg(initInjectionConfig(projectPath, moduleName));
        autoGenerator.setTemplate(initTemplateConfig());
        autoGenerator.setStrategy(initStrategyConfig(tableNames));
        autoGenerator.setTemplateEngine(new VelocityTemplateEngine());
        autoGenerator.execute();
    }

    /**
     * 读取控制台内容信息
     */
    private static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        System.out.println(("请输入" + tip + "："));
        if (scanner.hasNext()) {
            String next = scanner.next();
            if (StrUtil.isNotEmpty(next)) {
                return next;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    /**
     * 初始化全局配置
     */
    private static GlobalConfig initGlobalConfig(String projectPath) {
        GlobalConfig globalConfig = new GlobalConfig();
        globalConfig.setOutputDir(projectPath + "/src/main/java");
        globalConfig.setAuthor("wangnaixing");
        globalConfig.setOpen(false);
        globalConfig.setSwagger2(true);
        globalConfig.setBaseResultMap(true);
        globalConfig.setFileOverride(true);
        globalConfig.setDateType(DateType.ONLY_DATE);
        globalConfig.setEntityName("%s");
        globalConfig.setMapperName("%sMapper");
        globalConfig.setXmlName("%sMapper");
        globalConfig.setServiceName("%sService");
        globalConfig.setServiceImplName("%sServiceImpl");
        globalConfig.setControllerName("%sController");
        return globalConfig;
    }

    /**
     * 初始化数据源配置
     */
    private static DataSourceConfig initDataSourceConfig() {
        Props props = new Props("generator.properties");
        DataSourceConfig dataSourceConfig = new DataSourceConfig();
        dataSourceConfig.setUrl(props.getStr("dataSource.url"));
        dataSourceConfig.setDriverName(props.getStr("dataSource.driverName"));
        dataSourceConfig.setUsername(props.getStr("dataSource.username"));
        dataSourceConfig.setPassword(props.getStr("dataSource.password"));
        return dataSourceConfig;
    }

    /**
     * 初始化包配置
     */
    private static PackageConfig initPackageConfig(String moduleName) {
        Props props = new Props("generator.properties");
        PackageConfig packageConfig = new PackageConfig();
        packageConfig.setModuleName(moduleName);
        packageConfig.setParent(props.getStr("package.base"));
        packageConfig.setEntity("model");
        return packageConfig;
    }

    /**
     * 初始化模板配置
     */
    private static TemplateConfig initTemplateConfig() {
        TemplateConfig templateConfig = new TemplateConfig();
        //可以对controller、service、entity模板进行配置
        //mapper.xml模板需单独配置
        templateConfig.setXml(null);
        return templateConfig;
    }

    /**
     * 初始化策略配置
     */
    private static StrategyConfig initStrategyConfig(String[] tableNames) {
        StrategyConfig strategyConfig = new StrategyConfig();
        strategyConfig.setNaming(NamingStrategy.underline_to_camel);
        strategyConfig.setColumnNaming(NamingStrategy.underline_to_camel);
        strategyConfig.setEntityLombokModel(true);
        strategyConfig.setRestControllerStyle(true);
        //当表名中带*号时可以启用通配符模式
        if (tableNames.length == 1 && tableNames[0].contains("*")) {
            String[] likeStr = tableNames[0].split("_");
            String likePrefix = likeStr[0] + "_";
            strategyConfig.setLikeTable(new LikeTable(likePrefix));
        } else {
            strategyConfig.setInclude(tableNames);
        }
        return strategyConfig;
    }

    /**
     * 初始化自定义配置
     */
    private static InjectionConfig initInjectionConfig(String projectPath, String moduleName) {
        // 自定义配置
        InjectionConfig injectionConfig = new InjectionConfig() {
            @Override
            public void initMap() {
                // 可用于自定义属性
            }
        };
        // 模板引擎是Velocity
        String templatePath = "/templates/mapper.xml.vm";
        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/mapper/" + moduleName
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        injectionConfig.setFileOutConfigList(focList);
        return injectionConfig;
    }

}

1.3、MyBatisConfig

package com.wnx.mall.tiny.config;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.optimize.JsqlParserCountOptimize;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@MapperScan("com.wnx.mall.tiny.modules.*.mapper")
@Configuration
public class MyBatisConfig {
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }
}