六、mybatis-plus的代码生成器

简介：构建自定义mybatis-plus模板，自动生成mybatis,entity,mapper,service,controller

项目源码：https://github.com/y369q369/springBoot.git     ->     myBatisPlus

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1.demo完整代码结构

 2.pom.xml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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    
    <groupId>com.demo</groupId>
    <artifactId>mybatisPlus</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatisPlus</name>
    <description>使用mybatisPlus代码生成器</description>

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

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>
        
        <!-- web依赖，包含servlet,内置tomcat等 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <!-- mysql依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        <!-- ORACLE相关 -->
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>12.1.0.1-atlassian-hosted</version>
        </dependency>
        
        <!-- mybatis-plus依赖, 可以代替mybatis -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.1</version>
        </dependency>
        
        <!--  MyBatis-Plus 从 3.0.3 之后移除了代码生成器与模板引擎的默认依赖，需要手动添加相关依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.1.1</version>
        </dependency>
        
        <!-- Freemarker模板引擎 -->
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
        </dependency>

    </dependencies>

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

</project>

3.生成器代码

package mybatisPlus.generate;

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

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
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.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.FileOutConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.TemplateConfig;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

/**
 * @author GrassPrince
 * @Da2019年4月28日 2019年4月28日 - 下午2:37:11
 * @Description 数据库对应代码生成器
 */
public class DataSourcesGenerator {
    
    public static void main(String[] args) {
        // 生成地址 : // System.getProperty("user.dir") == 得到当前项目的实际地址
        String outputDir = System.getProperty("user.dir") + "/src/main/java";
//        String outputDir = "C://Users/VULCAN/Desktop/new";
        // 表名, 注意大小写
        String[] tableNames = new String[]{"test_hobby"};
        // 数据源：    1-mysql   2-oracle
        Integer dbType = 1;
        // 数据库地址
        String url = "jdbc:mysql://localhost:3306/xl?useUnicode=true&characterEncoding=utf8";
        // 用户名
        String userName = "root";
        // 密码
        String password = "ok";
        // 父包路径
        String parentPackage = "mybatisPlus";
        // 需要去掉的表名前缀
        String prefixTable = "Test_";
        generate(outputDir, tableNames, dbType, url, userName, password, parentPackage, prefixTable);
    }
    
    /**
     * @param outputDir   生成地址
     * @param tableNames  表名
     * @param dbType      数据源：    1-mysql   2-oracle
     * @param url            数据库地址
     * @param userName       用户名
     * @param password    密码
     * @param parentPackage  父包路径
     * @param prefixTable  需要去掉的表名前缀
     */
    public static void generate(String outputDir, String[] tableNames, Integer dbType, String url, String userName, 
            String password, String parentPackage, String prefixTable) {
        // ===============  全局配置  ==================
        GlobalConfig gc = new GlobalConfig();
        gc.setOutputDir(outputDir)
            .setActiveRecord(true)                                // 是否支持 AR, 实体类只需继承 Model 类即可进行强大的 CRUD 操作
            .setAuthor("GrassPrince")                             // 设置作者名字
            .setFileOverride(true)                                 // 文件覆盖(全新文件)
            .setIdType(IdType.AUTO)                                // 主键策略
            .setEnableCache(false)                                // SQL 二级缓存
            .setBaseResultMap(true)                             // SQL 映射文件
            .setBaseColumnList(true)                            // SQL 片段
            .setServiceName("%sService")                        // service的名字
            .setOpen(false);
        
        // =================  数据源配置   ===============
        DataSourceConfig dsc = new DataSourceConfig(); 
        if(dbType == 1) {
            dsc.setDbType(DbType.MYSQL)
             .setDriverName("com.mysql.cj.jdbc.Driver");
        }else if(dbType == 2){
            dsc.setDbType(DbType.ORACLE)
             .setDriverName("oracle.jdbc.driver.OracleDriver");
        }
        dsc.setUrl(url)
           .setUsername(userName)
           .setPassword(password);
        
        // =================  包配置  ===================
         PackageConfig pc = new PackageConfig();
         pc.setParent(parentPackage)                            // 配置父包路径
//           .setModuleName("base")                                // 配置业务包路径
           .setMapper("mapper")
           .setEntity("entity")
           .setService("service")
           //.setServiceImpl("service.impl");                     // 会自动生成 impl，可以不设定
           .setController("controller");
         
       // ==================  自定义配置  ================= 
         InjectionConfig cfg = new InjectionConfig() {
             @Override
             public void initMap() {
                 // to do nothing
             }
         };
         List<FileOutConfig> focList = new ArrayList<>();
         // 调整 xml 生成目录演示
         focList.add(new FileOutConfig("/templates/ftl/mapper.xml.ftl") {
             @Override
             public String outputFile(TableInfo tableInfo) {
                 // 自定义输入文件名称
                 return System.getProperty("user.dir") + "/src/main/resources/mybatis/"
                         + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
             }
         });
         cfg.setFileOutConfigList(focList);
         
         // ===================  策略配置  ================== 
         StrategyConfig strategy = new StrategyConfig();
         strategy.setNaming(NamingStrategy.underline_to_camel)                    // 表名命名：  underline_to_camel 底线变驼峰
                 .setColumnNaming(NamingStrategy.underline_to_camel)            // 字段命名： underline_to_camel 底线变驼峰
                 .setInclude(tableNames)                                        // 需要生成的 表名
                 .setCapitalMode(true)                                            // 全局大写命名 ORACLE 注意 
                 .setTablePrefix(prefixTable)                                    // 去掉 表的前缀
//                 .setFieldPrefix(pc.getModuleName() + "_")                    // 去掉字段前缀
//                 .setSuperEntityClass("com.maoxs.pojo")                        // 继承类
//                 .setSuperControllerClass("com.maoxs.controller")                // 继承类
//                 .setSuperEntityColumns("id")                                 // 设置超级超级列
//                 .setEntityLombokModel(true)                                    // 是否加入lombok
                 .setControllerMappingHyphenStyle(true);                        // 设置controller映射联字符
       
         // ==================  自定义模板配置： 默认配置位置 mybatis-plus/src/main/resources/templates  ======================
         // 放置自己项目的 src/main/resources/templates 目录下, 默认名称一下可以不配置，也可以自定义模板名称
         TemplateConfig tc = new TemplateConfig();
         tc.setXml(null)                                                        // 设置生成xml的模板
           .setEntity("/templates/ftl/entity.java")                                // 设置生成entity的模板
           .setMapper("/templates/ftl/mapper.java")                                // 设置生成mapper的模板
           .setController("/templates/ftl/controller.java")                       // 设置生成service的模板
           .setService("/templates/ftl/service.java")                            // 设置生成serviceImpl的模板
           .setServiceImpl("/templates/ftl/serviceImpl.java");                    // 设置生成controller的模板
         
         // ====================  生成配置  =================== 
         AutoGenerator mpg = new AutoGenerator();
         mpg.setCfg(cfg)
                 .setTemplate(tc)
                 .setGlobalConfig(gc)
                 .setDataSource(dsc)
                 .setPackageInfo(pc)
                 .setStrategy(strategy)
                 .setTemplateEngine(new FreemarkerTemplateEngine());            // 选择 freemarker引擎，注意 pom 依赖必须有！
         mpg.execute();
    }

}

4.自定义ftl生成器配置文件

package ${package.Controller};

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.stereotype.Controller;
import org.springframework.beans.factory.annotation.Autowired;
import ${package.Service}.${table.serviceName};

@Controller
@RequestMapping("/${table.entityPath}")
public class ${table.controllerName} {

    @Autowired
    private ${table.serviceName} ${table.entityPath}Service;
    
    

}

package ${package.ServiceImpl};

import ${package.Entity}.${entity};
import ${package.Mapper}.${table.mapperName};
import ${package.Service}.${table.serviceName};
import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Autowired;

@Service
public class ${table.serviceImplName} implements ${table.serviceName} {
    
    @Autowired
    private ${table.mapperName} ${table.entityPath}Mapper;

    

}

package ${package.Service};

import ${package.Entity}.${entity};

public interface ${table.serviceName}{

}

package ${package.Entity};

import java.io.Serializable;
<#list table.importPackages as pkg>
<#if pkg == "java.util.Date">
import ${pkg};
</#if>
</#list>

/**
 * ${table.name} : ${table.comment!}
 */
public class ${entity}  implements Serializable {

    private static final long serialVersionUID = 1L;
<#-- ----------  属性私有化  ---------->
<#list table.fields as field>
    <#if field.keyFlag>
        <#assign keyPropertyName="${field.propertyName}"/>
    </#if>

    <#if field.keyFlag>
    <#-- 主键 -->
    /**
     * 主键 : ${field.name},  ${field.comment!}
     */
    <#-- 普通字段 -->
    <#elseif field.convert>
    /**
     * ${field.name},  ${field.comment!}
     */
    </#if>
<#-- 乐观锁注解 -->
    <#if (versionFieldName!"") == field.name>
    @Version
    </#if>
<#-- 逻辑删除注解 -->
    <#if (logicDeleteFieldName!"") == field.name>
    @TableLogic
    </#if>
    private ${field.propertyType} ${field.propertyName};
</#list>

<#------------  构造函数   ----------- -->
    public ${entity}(<#list table.fields as field>${field.propertyType} ${field.propertyName}<#sep>,</#list>){
        <#list table.fields as field>
            this.${field.propertyName} = ${field.propertyName};
        </#list>
    }
    
    public ${entity}(){
    }

<#------------  getter.setter封装  ---------->
<#if !entityLombokModel>
    <#list table.fields as field>
        <#if field.propertyType == "boolean">
            <#assign getprefix="is"/>
        <#else>
            <#assign getprefix="get"/>
        </#if>
    public ${field.propertyType} ${getprefix}${field.capitalName}() {
        return ${field.propertyName};
    }
        <#if entityBuilderModel>
    public ${entity} set${field.capitalName}(${field.propertyType} ${field.propertyName}) {
        <#else>
    public void set${field.capitalName}(${field.propertyType} ${field.propertyName}) {
        </#if>
        this.${field.propertyName} = ${field.propertyName};
        <#if entityBuilderModel>
        return this;
        </#if>
    }
    </#list>
</#if>

<#-------------  重写toString()  ----------------->
<#if !entityLombokModel>
    @Override
    public String toString() {
        return "${entity}{" +
    <#list table.fields as field>
        <#if field_index==0>
        "${field.propertyName}=" + ${field.propertyName} +
        <#else>
        ", ${field.propertyName}=" + ${field.propertyName} +
        </#if>
    </#list>
        "}";
    }
</#if>
}

package ${package.Mapper};

import ${package.Entity}.${entity};
import java.util.List;
import org.apache.ibatis.annotations.Param;

public interface ${table.mapperName}{
    
     /**
      *  查询表${table.name}所有信息
      */
     List<${entity}> find${entity}();
      
    <#list table.fields as field>
    <#if field.keyFlag>
     /**
      *  根据主键${field.propertyName}查询表${table.name}信息
      */
     ${entity} find${entity}By${field.propertyName}(@Param("${field.propertyName}") ${field.propertyType} ${field.propertyName});
    </#if>
    </#list>
    
    <#list table.fields as field>
    <#if field.keyFlag>
     /**
      *  根据主键${field.propertyName}查询表${table.name}信息
      */
     Integer delete${entity}By${field.propertyName}(@Param("${field.propertyName}") ${field.propertyType} ${field.propertyName});
    </#if>
    </#list>
    
    <#list table.fields as field>
    <#if field.keyFlag>
     /**
      *  根据主键${field.propertyName}更新表${table.name}信息
      */
     Integer update${entity}By${field.propertyName}(${entity} ${table.entityPath});
    </#if>
    </#list>
    
    <#list table.fields as field>
    <#if field.keyFlag>
     /**
      *  新增表${table.name}信息
      */
     Integer add${entity}(${entity} ${table.entityPath});
    </#if>
    </#list>
    
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="${package.Mapper}.${table.mapperName}">

<#if enableCache>
    <!-- 开启二级缓存 -->
    <cache type="org.mybatis.caches.ehcache.LoggingEhcache"/>

</#if>
<#if baseResultMap>
    <!-- 通用查询映射结果 -->
    <resultMap id="${entity}Map" type="${package.Entity}.${entity}">
<#list table.fields as field>
<#if field.keyFlag><#--生成主键排在第一位-->
        <id column="${field.name}" property="${field.propertyName}" />
</#if>
</#list>
<#list table.commonFields as field><#--生成公共字段 -->
    <result column="${field.name}" property="${field.propertyName}" />
</#list>
<#list table.fields as field>
<#if !field.keyFlag><#--生成普通字段 -->
        <result column="${field.name}" property="${field.propertyName}" />
</#if>
</#list>
    </resultMap>

</#if>

    <!-- 查询表${table.name}所有信息 -->
    <select id="find${entity}" resultMap="${entity}Map">
        select * from ${table.name}
    </select>
    
    <#list table.fields as field>
    <#if field.keyFlag>
    <!-- 根据主键${field.propertyName}查询表${table.name}信息 -->
    <select id="find${entity}By${field.propertyName}" resultMap="${entity}Map">
        select * from ${table.name} where ${field.name}=${r"#{"}${field.propertyName}${r"}"}    
    </select>
    </#if>
    </#list>
    
    <#list table.fields as field>
    <#if field.keyFlag>
    <!-- 根据主键${field.propertyName}删除表${table.name}信息 -->
    <delete id="delete${entity}By${field.propertyName}">
        delete from ${table.name} where ${field.name}=${r"#{"}${field.propertyName}${r"}"}    
    </delete>
    </#if>
    </#list>
    
    <#list table.fields as field>
    <#if field.keyFlag>
    <!-- 根据主键${field.propertyName}更新表${table.name}信息 -->
    <update id="update${entity}By${field.propertyName}" parameterType="${package.Entity}.${entity}">
        update from ${table.name} set 
            <#list table.fields as field><#if !field.keyFlag>${field.name}=${r"#{"}${field.propertyName}${r"}"}<#sep>,</#if></#list>
        where <#list table.fields as field><#if field.keyFlag>${field.name}=${r"#{"}${field.propertyName}${r"}"}</#if></#list>
    </update>
    </#if>
    </#list>
    
    <#list table.fields as field>
    <#if field.keyFlag>
    <!-- 新增表${table.name}信息 -->
    <insert id="add${entity}">        
        insert into ${table.name}
            (<#list table.fields as field><#if field.keyFlag>${field.name}</#if></#list><#list table.fields as field><#if !field.keyFlag>,${field.name}</#if></#list>) 
        values
            (<#list table.fields as field><#if field.keyFlag>${r"#{"}${field.propertyName}${r"}"}</#if></#list><#list table.fields as field><#if !field.keyFlag>,${r"#{"}${field.propertyName}${r"}"}</#if></#list>)
    </insert>
    </#if>
    </#list>

<#if baseColumnList>
    <!-- 通用查询结果列 -->
    <sql id="Base_Column_List">
<#list table.commonFields as field>
        ${field.name},
</#list>
        ${table.fieldNames}
    </sql>

</#if>
</mapper>

5.全部配置完，直接用java Application运行generate

注意点：主要在generate中，把需要的地址，数据源，路径配置好即可使用