实战：一键生成前后端代码，Mybatis-Plus代码生成器让我舒服了

栏目: IT技术 · 发布时间: 4年前

内容简介：在日常的软件开发中，程序员往往需要花费大量的时间写CRUD，不仅枯燥效率低，而且每个人的代码风格不统一。MyBatis-Plus 代码生成器，通过 AutoGenerator 可以快速生成 Entity、Mapper、Mapper XML、Service、Controller 等各个模块及前端页面的代码，极大的提升了开发效率。本项目将以springboot用演示，前端使用freemaker,数据库持久层用mybatis(考虑到mybatis的使用还是最普遍的，就没有用jpa和mybatisplus)，通过V

实战：一键生成前后端代码，Mybatis-Plus代码生成器让我舒服了

前言

在日常的软件开发中，程序员往往需要花费大量的时间写CRUD，不仅枯燥效率低，而且每个人的代码风格不统一。MyBatis-Plus 代码生成器，通过 AutoGenerator 可以快速生成 Entity、Mapper、Mapper XML、Service、Controller 等各个模块及前端页面的代码，极大的提升了开发效率。

项目介绍

本项目将以springboot用演示，前端使用freemaker,数据库持久层用mybatis(考虑到mybatis的使用还是最普遍的，就没有用jpa和mybatisplus)，通过Velocity模板引擎配置各模块的文件模板，通过mybatis-plus代码生成器连接mysql，用商品表为例生成各模块的代码和前端页面。(本项目只演示分页查询和导出功能)。

本项目所有代码和脚本都能都文末找到地址。

实战

数据库脚本

创建一张商品表test_goods

CREATE TABLE `test_goods` (
  `id` bigint(20) DEFAULT NULL COMMENT 'id',
  `goods_sn` varchar(45) DEFAULT NULL COMMENT '商品编码',
  `name` varchar(255) DEFAULT NULL COMMENT '商品名称',
  `title` varchar(80) DEFAULT NULL COMMENT '标题',
  `price` decimal(10,2) DEFAULT NULL COMMENT '售价',
  `status` int(2) DEFAULT NULL COMMENT '商品状态',
  `sale_count` int(11) DEFAULT NULL COMMENT '销量',
  `create_date` datetime DEFAULT NULL COMMENT '创建时间',
  `modify_date` datetime DEFAULT NULL COMMENT '修改时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8

maven依赖

<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>2.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>2.1.4</version>
        </dependency>

        <!-- aspectj -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <scope>provided</scope>
        </dependency>
        <!--es-->

        <!-- lombok 简化get/set 方法 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
		<!--csv导出用到-->
        <dependency>
            <groupId>com.opencsv</groupId>
            <artifactId>opencsv</artifactId>
            <version>3.8</version>
        </dependency>
		
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
    </dependencies>

配置文件

mybatis:
  mapper-locations: classpath:mybatis/*Mapper.xml
  type-aliases-package: com.lzn.mybatisplus.codegenerator.entity

spring:
  datasource:
    username: root
    password: 123qwe
    url: jdbc:mysql://192.168.0.1:3306/myProject?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver
  redis:
    host: 192.168.0.1
    password: 1234qwer
    port: 6379
  freemarker:
    template-loader-path: classpath:/templates/pages/
    cache: false
    charset: UTF-8
    check-template-location: true
    content-type: text/html
    expose-request-attributes: true
    expose-session-attributes: true
    suffix: .ftl

模板文件

本项目中，所有模块的文件都是用Velocity模板引擎生成，这里简单介绍下Velocity的语法，在Velocity中用${}表示变量，例如：${table.entityName} 表示实体名，${field.name} 表示字段名，我们在AutoGenerator代码生成器里定义的全局变量 ${author}、${date} 表示作者，日期等。在Velocity中用#表示语法，例如 #foreach($field in ${table.fields}) #end遍历表字段。下面演示几个类、前端文件、xml文件的模板文件

实体类模板(entity.java.vm)

package ${package.Entity};

import java.math.BigDecimal;
import java.util.Date;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

/**
 * 数据库表名 ${table.name}
 *
 * @author ${author}
 * @date ${date}
 */
@Getter
@Setter
@ToString
public class ${table.entityName}  {

    #foreach($field in ${table.fields})
    /**
     * 数据库字段名 ${field.name} 类型 ${field.type}
     */
    private ${field.propertyType}  ${field.propertyName};

    #end

}

Controller模板(controller.java.vm)

package ${package.Controller};

import ${package.Entity}.${entity};
import ${package.Service}.${table.serviceName};
import com.lzn.mybatisplus.codegenerator.export.${table.entityName}VO;
import com.lzn.mybatisplus.codegenerator.export.${table.entityName}ExportService;
import com.lzn.mybatisplus.codegenerator.utils.entity.*;
import com.lzn.mybatisplus.codegenerator.utils.export.*;
import org.apache.commons.beanutils.ConvertUtils;
import com.lzn.mybatisplus.codegenerator.utils.ParameterUtil;
import com.lzn.mybatisplus.codegenerator.utils.entity.GridDataModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
import java.util.Map;

/**
 * <p>
 * ${tablecomment}  前端控制器
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
@Controller
@RequestMapping(value="/admin/${table.entityPath}")
public class ${table.controllerName}{
    private static Logger logger = LoggerFactory.getLogger(${table.controllerName}.class);

    @Resource
    private ${entity}Service ${table.entityPath}Service;



    @RequestMapping(value = "list", method = RequestMethod.GET)
    public String list(Model model){
        return "/admin/${cfg.pageDirName}/list";
    }

    @RequestMapping(value = "searchList", method = RequestMethod.POST)
    @ResponseBody
    @ExportMethod(serviceClass = ${entity}ExportService.class, memo = "明细导出")
    public String searchList(ServletRequest request,@ModelAttribute("page")  OmuiPage page){
        try {
            Map<String,Object> searchParam =    ParameterUtil.getParametersStartingWith(request, "filter_");
            GridDataModel<${entity}VO> gd =${table.entityPath}Service.findByPage(searchParam, page);
            return JsonMapper.nonDefaultMapper().toJson(gd);
        } catch (Exception e) {
            logger.error("查询出错了",e);
            return JsonMapper.nonDefaultMapper().toJson(new Resp("false", e.getMessage()));
        }
    }


}

Service类模板(service.java.vm)

package ${package.Service};



import org.springframework.stereotype.Service;
import com.lzn.mybatisplus.codegenerator.dao.${table.mapperName};
import com.lzn.mybatisplus.codegenerator.utils.entity.GridDataModel;
import com.lzn.mybatisplus.codegenerator.utils.entity.OmuiPage;
import com.lzn.mybatisplus.codegenerator.export.${table.entityName}VO;

import javax.annotation.Resource;
import java.math.BigDecimal;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;


/**
 * <p>
 * $!{tablecomment} 服务类
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
@Service
public class ${table.serviceName} {

    @Resource
    private ${table.mapperName} ${table.entityPath}Dao;

    /**
     * 分页查询
     * */
    public GridDataModel<${table.entityName}VO>  findByPage(Map<String, Object> searchParams, OmuiPage page){
        GridDataModel<${table.entityName}VO> gm = new GridDataModel<${table.entityName}VO>();
        searchParams.put("start", page.getStart());
        searchParams.put("limit", page.getLimit());
        long count = ${table.entityPath}Dao.countForPage(searchParams);
        List<${table.entityName}VO> list = ${table.entityPath}Dao.listForPage(searchParams);
        gm.setTotal(count);
        gm.setRows(list);
        return gm;
    }



}

Dao类模板(dao.java.vm)

package ${package.Mapper};

import com.lzn.mybatisplus.codegenerator.entity.${table.entityName};
import com.lzn.mybatisplus.codegenerator.export.${table.entityName}VO;
import java.util.List;
import java.util.Map;

public interface ${table.mapperName}  {
    /**
     *  根据主键删除数据库的记录, ${table.name}
     */
    int deleteByPrimaryKey(Long id);

    /**
     *  新写入数据库记录, ${table.name}
     */
    int insert(${table.entityName} record);

    /**
     *  根据指定主键获取一条数据库记录, ${table.name}
     */
    ${table.entityName} selectByPrimaryKey(Long id);

    /**
     *  根据主键来更新符合条件的数据库记录, ${table.name}
     */
    int updateByPrimaryKey(${table.entityName} record);

    /**
     *  根据条件分页查询
     * */
    List<${table.entityName}VO> listForPage(Map<String,Object> searchMap);

    /**
     *  根据条件分页查询(计数)
     * */
    long countForPage(Map<String,Object> searchMap);
    
}

Mapper.xml模板(mapper.xml.vm)

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

    #if(${baseColumnList})
        <!-- 通用查询结果列 -->
        <sql id="Base_Column_List">
        #foreach($field in ${table.commonFields})
            #if(${field.name} == ${field.propertyName})${field.name}#else${field.name} AS ${field.propertyName}#end,
        #end
        ${table.fieldNames}
        </sql>
    #end

    <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
        <!-- -->
        delete from ${table.name}
        where
        #foreach($field in ${table.fields})
            #if(${field.keyFlag})## 主键
                ${field.name} = #{ ${field.propertyName} }
            #end
        #end
    </delete>

    <insert id="insert" parameterType="${package.Entity}.${entity}">
        <!-- -->
        <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Long">
            SELECT LAST_INSERT_ID()
        </selectKey>
        insert into ${table.name} (
        #foreach($field in ${table.fields})
            #if(!${field.keyFlag})##生成普通字段
                ${field.name}#if($foreach.hasNext),#end
            #end
        #end
        )
        values (
        #foreach($field in ${table.fields})
            #if(!${field.keyFlag})##生成普通字段
                #{ ${field.propertyName}}#if($foreach.hasNext),#end
            #end
        #end
        )
    </insert>

    <update id="updateByPrimaryKey" parameterType="${package.Entity}.${entity}">
        <!-- -->
        update ${table.name}
        set
        #foreach($field in ${table.fields})
            #if(!${field.keyFlag})##生成普通字段
               ${field.name} = #{ ${field.propertyName}} #if($foreach.hasNext),#end
            #end
        #end
        where
        #foreach($field in ${table.fields})
            #if(${field.keyFlag})
              id = #{ ${field.name} }
            #end
        #end
    </update>


    <select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
        <!-- -->
        select
        <include refid="Base_Column_List" />
        from ${table.name}
        where id = #{ id }
    </select>

    <select id="countForPage" parameterType="map" resultType="Long">
        <!-- -->
        select
         count(*)
        from
        ${table.name}
        where 1=1
        <if test="beginDate != null and beginDate != ''">
            and create_date <![CDATA[>=]]>  #{beginDate}
        </if>
        <if test="endDate != null and endDate != ''">
            and  create_date <![CDATA[<=]]> #{endDate}
        </if>
    </select>

    <select id="listForPage" parameterType="map" 	resultType="com.lzn.mybatisplus.codegenerator.export.${table.entityName}VO">
        <!-- -->
        select
        <include refid="Base_Column_List" />
        from
        ${table.name}
        where 1=1
        <if test="beginDate != null and beginDate != ''">
            and create_date <![CDATA[>=]]>  #{beginDate}
        </if>
        <if test="endDate != null and endDate != ''">
            and  create_date <![CDATA[<=]]> #{endDate}
        </if>
        limit #{start}, #{limit}
    </select>
</mapper>

前端页面list.ftl模板(list.ftl.vm)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <#assign base=request.contextPath>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>$!{tablecomment}</title>
<link href="${base}/static/omui/css/elegant/om-all.css" rel="stylesheet" type="text/css" />
<link href="${base}/static/admin/css/admin.css" rel="stylesheet" type="text/css" />

<script type="text/javascript" src="${base}/static/js/jquery-1.7.1.js"></script>
<script type="text/javascript" src="${base}/static/js/HForm.js"></script>
<script type="text/javascript" src="${base}/static/My97DatePicker/WdatePicker.js"></script>
<script type="text/javascript" src="${base}/static/omui/js/operamasks-ui.min.js"></script>
<script type="text/javascript" src="${base}/static/omui/js/common.js"></script>
<script type="text/javascript" src="${base}/static/bui/js/common.js"></script>
<script type="text/javascript" src="${base}/static/admin/js/export.js"></script>

<script type="text/javascript">


   $().ready(function(){

      //初始化控件
      $("#search-panel").omPanel({
         title : "条件搜索",collapsible:false
      });

      //搜索
      $('#searchButton').bind('click', function(e) {
           var data = $("#listForm").HForm('form2json');
           $('#listGrid').omGrid({extraData:data});
      });

      $("#start-time").omCalendar();
      $("#time-end").omCalendar();

       $('#searchButton').omButton({
         icons : {left : '${base}/static/omui/images/search.png'},width : 70
       });

        $(".input-select").change(function(){
            $('#searchButton').click();
        });

      $('#buttonbar').omButtonbar({
         btns : [{label:"导出Excel",
                  id:"addbutton" ,
                  icons : {left : '${base}/static/omui/images/export.png'},
                  onClick:function()
                     {
                        exportUtil({
                           title : "列表导出",
                           exportUrl : "${base}/admin/${table.entityPath}/searchList",
                           extraParam : $("#listForm").HForm('form2json')
                        });
                     }
                  }
               ]
      });


      //初始化列表
      var  height=$(document).height() -$('#search-panel').outerHeight()-$('#buttonbar').outerHeight()-40;
      $('#listGrid').omGrid({
         height:height,
         limit:20,
         method:'post',
         singleSelect:false,
         extraData:$("#listForm").HForm('form2json'),
         dataSource : '${base}/admin/${table.entityPath}/searchList',
         colModel : [
                     {header : 'ID', name : 'id', width : 30, align : 'left',sort:'serverSide'},
                  {header : '创建时间', name : 'createDate', width : 150, align : 'left',sort:'serverSide',renderer :dataFormat1},
                  {header : '修改时间', name : 'modifyDate', width : 150, align : 'left',sort:'serverSide',renderer :dataFormat1},
#foreach($field in ${table.fields})

#set($comment = "")
#set($type = "")
#set($isNullAble = true)
#set($defaultValue = false)
#set($listIsShow = true)
#set($listIsSearch = false)

#foreach( $e in $field.comment.split(","))
    #if( $foreach.count == 1 )
    #set($comment = $e)
    #elseif( $foreach.count == 2 )
    #set($type = $e)
    #elseif( $foreach.count == 3)
    #if($e == "YES")
    #set($isNullAble = true)
    #else
    #set($isNullAble = false)
    #end
    #elseif( $foreach.count == 4)
    #if($e == "true")
    #set($defaultValue = true)
    #else
    #set($defaultValue = false)
    #end
    #elseif( $foreach.count == 5)
    #if($e == "true")
    #set($listIsShow = true)
    #else
    #set($listIsShow = false)
    #end
    #elseif( $foreach.count == 6)
    #if($e == "true")
    #set($listIsSearch = true)
    #else
    #set($listIsSearch = false)
    #end
    #end
#end
         {header : '#if("$!comment" != "")${comment}#end', name : '${field.propertyName}',width : 90, align : 'left',sort:'serverSide'#if($type == "timer"),renderer :dataFormat1 #end},
#end
         ],
         rowDetailsProvider:function(rowData){
         }
      });

      //初始化控件  end
      function getIds(datas) {
         var str = "";
         for (var i = 0; i < datas.length; i++) {
            str += datas[i].id + ",";
         }
         //去掉最后一个逗号(如果不需要去掉，就不用写)
         if (str.length > 0) {
            str = str.substr(0, str.length - 1);
         }
         return str;
      }

      $('#searchButton').click();
   });



</script>
</head>
<body >

<div id="search-panel">
    <form id="listForm">
   <div>
      <span>状态:</span>
      <select  name="filter_EQS_status">
         <option value="0" selected>待处理</option>
         <option value="1">已处理</option>
         <option value="">全部</option>
      </select>
      <span>手机号：</span>
      <input type="text" name="filter_LIKES_mobile" />
      <span>联系人：</span>
      <input type="text" name="filter_LIKES_name" />
      <span>创建时间：</span>
      <input id="start-time" name="filter_GTED_createDate"/>
      -
      <input id="time-end"  name="filter_LTED_createDate"/>
      <span id="searchButton">查询</span>
   </div>
   </form>
</div>

<div id="buttonbar"></div><!-- 工具栏位置 -->
<table id="listGrid"></table> <!-- 主列表位置 -->

</body>
</html>