Mybatis Plus代码生成

代码如下：

package com.xiao.permission_system.generator;

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.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.BeetlTemplateEngine;

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

/**
 * @author beth
 * @data 2019-09-12 09:33
 */
public class CodeGenerator {
    /**
     * 生成代码
     */
    private static void generateCode() {
         // 项目路径
         String projectPath = System.getProperty("user.dir");

         // 生成文件人
         String  author = "beth";

         // 数据库连接信息
         String url = "jdbc:mysql://localhost/permission_system?useUnicode=true&useSSL=false&characterEncoding=utf8";
         String driverName = "com.mysql.cj.jdbc.Driver";
         String username = "root";
         String password = "000000";

         // 父包名
         String parentPackage = "com.xiao.permission_system";

         // 实体类输出包
         String entityPackage = "entity";

        // mapper输出包
        String mapperPackage = "mapper";

         // service输出包
        String servicePackage = "service";

        // serviceImpl输出包
        String serviceImplPackage = "service.impl";

       // controller输出包
       String controllerPackage = "controller";

        // entity输出模版
        String entityTemplate = "templates/entity.java";

        // service输出模版
        String serviceTemplate = "templates/service.java";

        // mapper输出模版
        String mapperTemplate = "templates/mapper.java";

        // controller输出模版
        String controllerTemplate = "templates/controller.java";

        // 父类实体
        String baseEntity = "com.xiao.permission_system.common.BaseEntity";

        // 父类控制器
        String baseController = "com.xiao.permission_system.common.BaseController";

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

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor(author);
        gc.setOpen(false);
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl(url);
        dsc.setDriverName(driverName);
        dsc.setUsername(username);
        dsc.setPassword(password);
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        //pc.setModuleName(scanner("模块名"));
        pc.setParent(parentPackage);
        pc.setEntity(entityPackage);
        pc.setMapper(mapperPackage);
        pc.setService(servicePackage);
        pc.setServiceImpl(serviceImplPackage);
        pc.setController(controllerPackage);
        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.btl";

        // 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/" + pc.getModuleName()
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();
        templateConfig.setEntity(entityTemplate);
        templateConfig.setService(serviceTemplate);
        templateConfig.setMapper(mapperTemplate);
        templateConfig.setController(controllerTemplate);
        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setSuperEntityClass(baseEntity);
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        strategy.setSuperControllerClass(baseController);
        strategy.setSuperEntityColumns("id");
        strategy.setControllerMappingHyphenStyle(true);
        strategy.setTablePrefix( "sys_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new BeetlTemplateEngine());
        mpg.execute();
    }

    public static void main(String[] args) {
        generateCode();
    }

}

1、Mybatis Plus默认有三种生成代码的模版引擎。 Velocity（默认）、Freemarker、Beetl

2、以上三种模版引擎分别对应如下模版，如果没有在代码中指定自己的模版，则系统默认用以下的模版。如果模板引擎是 freemarker，则文件后缀为ftl,如果模板引擎是velocity，则模版后缀为.vm,如果模板引擎是Beetl，则模版后缀为.btl

3、使用自己的模板，在代码中指定自定义模板路径即可。

4、使用Beetl的自定义模版

package ${package.Controller};

import com.xiao.permission_system.service.${table.serviceName};
import org.springframework.beans.factory.annotation.Autowired;
import io.swagger.annotations.ApiOperation;
import com.xiao.permission_system.entity.${table.entityName};
import org.springframework.web.bind.annotation.*;

<% if(restControllerStyle){ %>
import org.springframework.web.bind.annotation.RestController;
<% }else{ %>
import org.springframework.stereotype.Controller;
<% } %>
<% if(isNotEmpty(superControllerClassPackage)){ %>
import ${superControllerClassPackage};
<% } %>

/**
* <p>
* ${table.comment!} 前端控制器
* </p>
*
* @author ${author}
* @since ${date}
*/
<% if(restControllerStyle){ %>
@RestController
<% }else{ %>
@Controller
<% } %>
@RequestMapping("<% if(isNotEmpty(package.ModuleName)){ %>/${package.ModuleName}<% } %>/<% if(isNotEmpty(controllerMappingHyphenStyle)){ %>${controllerMappingHyphen}<% }else{ %>${table.entityPath}<% } %>")
<% if(kotlin){ %>
class ${table.controllerName}<% if(isNotEmpty(superControllerClass)){ %> : ${superControllerClass}()<% } %>
<% }else{ %>
   <% if(isNotEmpty(superControllerClass)){ %>
public class ${table.controllerName} extends ${superControllerClass} {
   <% }else{ %>
public class ${table.controllerName} {
   <% } %>

       @Autowired
       private ${table.serviceName} i${table.entityName}Service;

   /**
    * 新增
    */
   @ApiOperation(value = "新增数据")
   @RequestMapping(value = "/add", method = RequestMethod.POST)
   public int add(@RequestBody ${entity} entity){
       return i${table.entityName}Service.insert(entity);
    }

    /**
    * 删除
    */
   @ApiOperation(value = "删除数据")
   @RequestMapping(value = "/del")
   public int delete(@RequestParam("id") String id){
       Integer result = i${table.entityName}Service.deleteById(id);
       return result;
   }

   /**
    * 查询
    */
    @ApiOperation(value = "根据ID查询")
    @RequestMapping(value = "/selectById")
    public ${entity}  selectById(@RequestParam("id") String id){
       ${entity}  result = i${table.entityName}Service.selectById(id);
       return result;
    }
}
<% } %>

package ${package.Entity};
<% for(pkg in table.importPackages){ %>
import ${pkg};
<% } %>
<% if(swagger2){ %>
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
<% } %>
<% if(entityLombokModel){ %>
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
<% } %>
/**
 * <p>
 * ${table.comment!}
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
<% if(entityLombokModel){ %>
@Data
    <% if(isNotEmpty(superEntityClass)){ %>
@EqualsAndHashCode(callSuper = true)
    <% }else{ %>
@EqualsAndHashCode(callSuper = false)
    <% } %>
@Accessors(chain = true)
<% } %>
<% if(table.convert){ %>
@TableName("${table.name}")
<% } %>
<% if(swagger2){ %>
@ApiModel(value="${entity}对象", description="${table.comment!''}")
<% } %>
<% if(isNotEmpty(superEntityClass)){ %>
public class ${entity} extends ${superEntityClass}<% if(activeRecord){ %><${entity}><%}%>{
<% }else if(activeRecord){ %>
public class ${entity} extends Model<${entity}> {
<% }else{ %>
public class ${entity} implements Serializable {
<% } %>

<% if(entitySerialVersionUID){ %>
    private static final long serialVersionUID = 1L;
<% } %>
<% /** -----------BEGIN 字段循环遍历----------- **/ %>
<% for(field in table.fields){ %>
    <%
    if(field.keyFlag){
        var keyPropertyName = field.propertyName;
    }
    %>

    <% if(isNotEmpty(field.comment)){ %>
        <% if(swagger2){ %>
    @ApiModelProperty(value = "${field.comment}")
        <% }else{ %>
    /**
     * ${field.comment}
     */
        <% } %>
    <% } %>
    <% if(field.keyFlag){ %>
    <%
    /*主键*/
    %>
        <% if(field.keyIdentityFlag){ %>
    @TableId(value = "${field.name}", type = IdType.AUTO)
        <% }else if(isNotEmpty(idType)){ %>
    @TableId(value = "${field.name}", type = IdType.${idType})
        <% }else if(field.convert){ %>
    @TableId("${field.name}")
         <% } %>
    <%
    /*普通字段*/
    %>
    <% }else if(isNotEmpty(field.fill)){ %>
        <% if(field.convert){ %>
    @TableField(value = "${field.name}", fill = FieldFill.${field.fill})
        <% }else{ %>
    @TableField(fill = FieldFill.${field.fill})
        <% } %>
    <% }else if(field.convert){ %>
    @TableField("${field.name}")
    <% } %>
    <%
    /*乐观锁注解*/
    %>
    <% if(versionFieldName!'' == field.name){ %>
    @Version
    <% } %>
    <%
    /*逻辑删除注解*/
    %>
    <% if(logicDeleteFieldName!'' == field.name){ %>
    @TableLogic
    <% } %>
    private ${field.propertyType} ${field.propertyName};
<% } %>
<% /** -----------END 字段循环遍历----------- **/ %>

<% if(!entityLombokModel){ %>
    <% for(field in table.fields){ %>
        <%
        var getprefix ='';
        if(field.propertyType=='boolean'){
            getprefix='is';
        }else{
            getprefix='get';
        }
        %>
    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} ${field.propertyName}) {
        <% } %>
        this.${field.propertyName} = ${field.propertyName};
        <% if(entityBuilderModel){ %>
        return this;
        <% } %>
    }

    <% } %>
<% } %>
<% if(entityColumnConstant){ %>
   <% for(field in table.fields){ %>
    public static final String ${strutil.toUpperCase(field.name)} = "${field.name}";

   <% } %>
<% } %>
<% if(activeRecord){ %>
    @Override
    protected Serializable pkVal() {
    <% if(isNotEmpty(keyPropertyName)){ %>
        return this.${keyPropertyName};
    <% }else{ %>
        return null;
    <% } %>
    }

<% } %>
<% if(!entityLombokModel){ %>
    @Override
    public String toString() {
        return "${entity}{" +
    <% for(field in table.fields){ %>
       <% if(fieldLP.index==0){ %>
        "${field.propertyName}=" + ${field.propertyName} +
       <% }else{ %>
        ", ${field.propertyName}=" + ${field.propertyName} +
       <% } %>
    <% } %>
        "}";
    }
<% } %>
}

package ${package.Mapper};

import ${package.Entity}.${entity};
import ${superMapperClassPackage};
import org.springframework.stereotype.Repository;

/**
 * <p>
 * ${table.comment!} Mapper 接口
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
<% if(kotlin){ %>
interface ${table.mapperName} : ${superMapperClass}<${entity}>
<% }else{ %>
@Repository
public interface ${table.mapperName} extends ${superMapperClass}<${entity}> {

}
<% } %>

package ${package.Service};

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

/**
 * <p>
 * ${table.comment!} 服务类
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
<% if(kotlin){ %>
interface ${table.serviceName} : ${superServiceClass}<${entity}>
<% }else{ %>
public interface ${table.serviceName} extends ${superServiceClass}<${entity}> {
    /**
     * <p>
     * 插入一条记录
     * </p>
     *
     * @param entity 实体对象
     * @return 插入成功记录数
     */
    int insert(${entity} entity);

    /**
     * <p>
     * 根据 ID 删除
     * </p>
     *
     * @param id 主键ID
     * @return 删除成功记录数
     */
    int deleteById(String id);

    /**
     * <p>
     * 根据 ID 查询
     * </p>
     *
     * @param id 主键ID
     * @return 实体
     */
    ${entity}  selectById(String id);
}
<% } %>

package ${package.ServiceImpl};

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

/**
 * <p>
 * ${table.comment!} 服务实现类
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
@Service
<% if(kotlin){ %>
open class ${table.serviceImplName} : ${superServiceImplClass}<${table.mapperName}, ${entity}>(), ${table.serviceName} {

}
<% }else{ %>
public class ${table.serviceImplName} extends ${superServiceImplClass}<${table.mapperName}, ${entity}> implements ${table.serviceName} {

        @Autowired
        private ${table.mapperName} ${table.mapperName};

        /**
         * <p>
         * 插入一条记录
         * </p>
         *
         * @param entity 实体对象
         * @return 插入成功记录数
         */
        public int insert(${entity} entity) {
           Integer result = ${table.mapperName}.insert(entity);
           return result;
        }

        /**
         * <p>
         * 根据 ID 删除
         * </p>
         *
         * @param id 主键ID
         * @return 删除成功记录数
         */
          public int deleteById(String id) {
              Integer result = ${table.mapperName}.deleteById(id);
              return result;
          }

          /**
           * <p>
           * 根据 ID 查询
           * </p>
           *
           * @param id 主键ID
           * @return 实体
           */
           public  ${entity}  selectById(String id){
              ${entity}  result = ${table.mapperName}.selectById(id);
              return result;
           }

}
<% } %>

来源：https://my.oschina.net/u/2427561/blog/3106442

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