集成velocity生成代码

正文

集成velocity生成代码，包含controller、service、impl、entity、mapper、vo、xml

效果图

pom文件

            org.springframework.boot
            spring-boot-starter-data-jpa
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            com.mysql
            mysql-connector-j
            runtime
        
        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            javax.persistence
            persistence-api
            1.0
        
        
            org.apache.velocity
            velocity-engine-core
            2.0
        
        
            mysql
            mysql-connector-java
            8.0.26
        

代码

VelocityCodeGenerator

package com.example.jpacodegenerator;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.*;
import java.util.*;

/**
 * Velocity代码生成器
 *
 * @author JunHao Huang
 * @since 2023/6/8 14:33
 */
public class VelocityCodeGenerator {

    /**
     * 数据库链接工具类
     */
    public class JdbcUtils {

        /**
         * jdbc
         */
        private static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
        /**
         * 数据库地址
         */
        private static final String DB_URL = "jdbc:mysql://localhost:3306/my_dev?useSSL=false&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true&tinyInt1isBit=false&allowMultiQueries=true&serverTimezone=GMT%2B8";
        /**
         * 账号
         */
        private static final String USER = "root";
        /**
         * 密码
         */
        private static final String PASSWORD = "root";

        public static Connection getConnection() throws ClassNotFoundException, SQLException {
            Class.forName(JDBC_DRIVER);
            return DriverManager.getConnection(DB_URL, USER, PASSWORD);
        }
    }

    /**
     * 获取表信息工具类
     */
    public class TableUtils {
        public static ResultSet printTableColumns(Connection conn, String tableName) throws SQLException {
            DatabaseMetaData metaData = conn.getMetaData();
            return metaData.getColumns(null, null, tableName, null);
        }
    }

    /**
     * Velocity工具类，主要获取模板信息
     */
    public class VelocityUtil {

        private static final String TEMPLATE_PATH = "/templates/";

        public static Template getTemplate(String name) {
            Properties properties = new Properties();
            properties.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
            properties.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());
            VelocityEngine engine = new VelocityEngine(properties);
            return engine.getTemplate(TEMPLATE_PATH + name, "UTF-8");
        }
    }

    /**
     * 自定义
     */
    private static final String BASE_PACKAGE = "cn.com.infox";
    private static final String MODULE_NAME = "attendance";
    private static final String CLASS_NAME = "MyTest";
    private static final String CLASS_NAME_SMART = "myTest";
    private static final String AUTHOR = "huangjunhao";
    private static final String TABLE_NAME = "myTest";
    private static final String MYSQL_TABLE_NAME = "my_test";


    /**
     * 不需要修改
     */
    private static final String CLASS_VO_NAME = CLASS_NAME + "VO";

    private static final String CLASS_VO_NAME_SMART = CLASS_NAME_SMART + "VO";
    private static final String CLASS_MAPPER_NAME = CLASS_NAME + "Mapper";
    private static final String CLASS_CONTROLLER_NAME = CLASS_NAME + "Controller";
    private static final String CLASS_SERVICE_NAME = CLASS_NAME + "Service";
    private static final String CLASS_SERVICE_IMPL_NAME = CLASS_NAME + "ServiceImpl";

    private static final String CONTROLLER_URL = BASE_PACKAGE + "." + MODULE_NAME + ".controller";
    private static final String ENTITY_URL = BASE_PACKAGE + "." + MODULE_NAME + ".entity";
    private static final String VO_URL = BASE_PACKAGE + "." + MODULE_NAME + ".vo";
    private static final String XML_URL = BASE_PACKAGE + "." + MODULE_NAME + ".xml";
    private static final String SERVICE_URL = BASE_PACKAGE + "." + MODULE_NAME + ".service";
    private static final String SERVICE_IMPL_URL = SERVICE_URL + ".impl";
    private static final String MAPPER_URL = BASE_PACKAGE + "." + MODULE_NAME + ".mapper";

    /**
     * 过滤的字段，实体不生成字段
     */
    private static final Map PASS_COLUMS = new HashMap<>();

    public static void main(String[] args) throws Exception {
        PASS_COLUMS.put("id", "id");
        PASS_COLUMS.put("is_deleted", "is_deleted");
        PASS_COLUMS.put("create_user", "create_user");
        PASS_COLUMS.put("create_time", "create_time");
        PASS_COLUMS.put("update_user", "update_user");
        PASS_COLUMS.put("update_time", "update_time");
        PASS_COLUMS.put("status", "status");
        //生成实体
        generateEntity(TABLE_NAME + "表的实体类");
        //生成VO
        generateVO(TABLE_NAME + "表的VO类");
        //生成控制器
        generateController(TABLE_NAME + "表的Controller层", "我的测试表", "我的测试表接口");
        //生成service
        generateService(TABLE_NAME + "表的Service层");
        //生成service实现类
        generateImpl(TABLE_NAME + "表的impl层");
        //生成mapper
        generateMapper(TABLE_NAME + "表的Mapper");
        //生成XML
        generateXML();
    }

    private static void generateXML() {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("className", CLASS_NAME);
        context.put("classNameSmart", CLASS_NAME_SMART);
        context.put("tableName", MYSQL_TABLE_NAME);
        context.put("classVOName", CLASS_VO_NAME);

        Template template = VelocityUtil.getTemplate("xml.vm");
        // 输出到文件
        writeFile(XML_URL, CLASS_MAPPER_NAME, ".xml", template, context);
    }

    private static void generateVO(String tableDesc) {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("importClasses", Arrays.asList(
                ENTITY_URL + "." + CLASS_NAME,
                "lombok.EqualsAndHashCode",
                "lombok.Data"
        ));

        context.put("tableDesc", tableDesc);
        context.put("author", AUTHOR);
        context.put("className", CLASS_NAME);

        Template template = VelocityUtil.getTemplate("VO.vm");
        // 输出到文件
        writeFile(VO_URL, CLASS_VO_NAME, ".java", template, context);
    }

    private static void writeFile(String voUrl, String classVoName, String x, Template template, VelocityContext context) {
        try {
            String fileUrl = "src/main/java/" + voUrl.replaceAll("\\.", "/");
            File dir = new File(fileUrl);
            if (!dir.exists()) {
                dir.mkdirs();
            }
            FileWriter writer = new FileWriter(fileUrl + "/" + classVoName + x);
            template.merge(context, writer);
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void generateEntity(String tableDesc) throws SQLException, ClassNotFoundException {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("importClasses", Arrays.asList(
                "cn.com.infox.core.mp.base.BaseEntity",
                "io.swagger.annotations.ApiModelProperty",
                "lombok.Data",
                "lombok.EqualsAndHashCode",
                "com.baomidou.mybatisplus.annotation.TableName",
                "java.util.Date"

        ));

        context.put("tableDesc", tableDesc);
        context.put("author", AUTHOR);
        context.put("mysqlTableName", MYSQL_TABLE_NAME);
        context.put("className", CLASS_NAME);
        Connection conn = JdbcUtils.getConnection();
        ResultSet mysqlTable = TableUtils.printTableColumns(conn, MYSQL_TABLE_NAME);
        List columnList = new ArrayList<>();

        while (mysqlTable.next()) {
            Column column2 = new Column();
            column2.setRemarks(mysqlTable.getString("REMARKS"));
            column2.setJavaType(MysqlDataEnum.getValue(mysqlTable.getString("TYPE_NAME")));
            String name = mysqlTable.getString("COLUMN_NAME");
            if (PASS_COLUMS.containsKey(name)) {
                continue;
            }
            StringBuffer newName = new StringBuffer();
            //包含_的字段将首字母变为大写
            if (name.contains("_")) {
                String[] split = name.split("_");
                for (int i = 0; i < split.length; i++) {
                    if (i == 0) {
                        newName.append(split[0]);
                    } else {
                        newName.append(split[i].substring(0, 1).toUpperCase() + split[i].substring(1));
                    }
                }
                column2.setPropertyName(newName.toString());
            } else {
                column2.setPropertyName(name);
            }
            columnList.add(column2);
        }
        conn.close();

        TableInfo tableInfo = new TableInfo();
        tableInfo.setColumnList(columnList);
        context.put("tableInfo", tableInfo);

        Template template = VelocityUtil.getTemplate("entity.vm");

        // 输出到文件
        writeFile(ENTITY_URL, CLASS_NAME, ".java", template, context);
    }

    private static void generateMapper(String tableDesc) {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("importClasses", Arrays.asList(
                "java.util.List",
                VO_URL + "." + CLASS_VO_NAME,
                "com.baomidou.mybatisplus.core.mapper.BaseMapper",
                "com.baomidou.mybatisplus.core.metadata.IPage",
                ENTITY_URL + "." + CLASS_NAME
        ));
        context.put("tableDesc", tableDesc);
        context.put("author", AUTHOR);
        context.put("className", CLASS_NAME);
        context.put("classNameSmart", CLASS_NAME_SMART);
        context.put("classVOName", CLASS_VO_NAME);
        context.put("classVONameSmart", CLASS_VO_NAME_SMART);

        Template template = VelocityUtil.getTemplate("mapper.vm");
        // 输出到文件
        writeFile(MAPPER_URL, CLASS_MAPPER_NAME, ".java", template, context);


    }


    private static void generateService(String tableDesc) {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("importClasses", Arrays.asList(
                VO_URL + "." + CLASS_VO_NAME,
                "cn.com.infox.core.mp.base.BaseService",
                "com.baomidou.mybatisplus.core.metadata.IPage",
                ENTITY_URL + "." + CLASS_NAME
        ));
        context.put("tableDesc", tableDesc);
        context.put("author", AUTHOR);
        context.put("className", CLASS_NAME);
        context.put("classNameSmart", CLASS_NAME_SMART);
        context.put("classVOName", CLASS_VO_NAME);
        context.put("classVONameSmart", CLASS_VO_NAME_SMART);

        Template template = VelocityUtil.getTemplate("service.vm");
        // 输出到文件
        writeFile(SERVICE_URL, CLASS_SERVICE_NAME, ".java", template, context);
    }

    private static void generateImpl(String tableDesc) {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("importClasses", Arrays.asList(
                ENTITY_URL + "." + CLASS_NAME,
                MAPPER_URL + "." + CLASS_MAPPER_NAME,
                SERVICE_URL + "." + CLASS_SERVICE_NAME,
                VO_URL + "." + CLASS_VO_NAME,
                "cn.com.infox.core.mp.base.BaseServiceImpl",
                "com.baomidou.mybatisplus.core.metadata.IPage",
                "org.springframework.stereotype.Service"
        ));
        context.put("tableDesc", tableDesc);
        context.put("author", AUTHOR);
        context.put("className", CLASS_NAME);
        context.put("classNameSmart", CLASS_NAME_SMART);
        context.put("classVOName", CLASS_VO_NAME);
        context.put("classVONameSmart", CLASS_VO_NAME_SMART);

        Template template = VelocityUtil.getTemplate("impl.vm");
        // 输出到文件
        writeFile(SERVICE_IMPL_URL, CLASS_SERVICE_IMPL_NAME, ".java", template, context);
    }

    private static void generateController(String tableDesc, String apiValue, String apiTag) {
        VelocityContext context = new VelocityContext();
        context.put("basePackage", BASE_PACKAGE);
        context.put("moduleName", MODULE_NAME);
        context.put("importClasses", Arrays.asList(
                ENTITY_URL + "." + CLASS_NAME,
                SERVICE_URL + "." + CLASS_NAME + "Service",
                VO_URL + "." + CLASS_VO_NAME,
                "cn.com.infox.core.boot.ctrl.BasicController",
                "cn.com.infox.core.mp.support.Condition",
                "cn.com.infox.core.mp.support.Query",
                "cn.com.infox.core.tool.api.R",
                "cn.com.infox.core.tool.utils.BeanUtil",
                "cn.com.infox.core.tool.utils.Func",
                "com.baomidou.mybatisplus.core.metadata.IPage",
                "com.baomidou.mybatisplus.extension.plugins.pagination.Page",
                "com.github.xiaoymin.knife4j.annotations.ApiOperationSupport",
                "io.swagger.annotations.Api",
                "io.swagger.annotations.ApiOperation",
                "io.swagger.annotations.ApiParam",
                "lombok.AllArgsConstructor",
                "org.springframework.web.bind.annotation.*",
                "javax.validation.Valid",
                "java.util.stream.Collectors"

        ));
        context.put("tableDesc", tableDesc);
        context.put("author", AUTHOR);
        context.put("baseUrl", CLASS_NAME_SMART);
        context.put("apiValue", apiValue);
        context.put("apiValue", apiTag);
        context.put("className", CLASS_NAME);
        context.put("classNameSmart", CLASS_NAME_SMART);
        context.put("classVOName", CLASS_VO_NAME);
        context.put("classVONameSmart", CLASS_VO_NAME_SMART);

        Template template = VelocityUtil.getTemplate("controller.vm");
        // 输出到文件
        writeFile(CONTROLLER_URL, CLASS_CONTROLLER_NAME, ".java", template, context);
    }

}

Column

package com.example.jpacodegenerator;

import lombok.Data;

/**
 * Mysql字段信息
 *
 * @author JunHao Huang
 * @since 2023/6/8 15:11
 */
@Data
public class Column {

    /**
     * 字段作用
     */
    private String remarks;
    /**
     * 字段类型
     */
    private String javaType;
    /**
     * 字段名
     */
    private String propertyName;
}

MysqlDataEnum

package com.example.jpacodegenerator;

import lombok.AllArgsConstructor;
import lombok.Getter;

/**
 * mysql数据类型转换枚举
 *
 * @author JunHao Huang
 * @since 2023/6/8 17:35
 */
@AllArgsConstructor
@Getter
public enum MysqlDataEnum {
    VARCHAR("VARCHAR", "String"),

    BIT("BIT", "int"),

    DATETIME("DATETIME", "Date"),
    INT("INT", "int"),

    ;

    private String key;

    private String value;


    public static String getValue(String key) {
        MysqlDataEnum[] enums = values();
        for (MysqlDataEnum approveEnums : enums) {
            if (approveEnums.key.equals(key)) {
                return approveEnums.value;
            }
        }
        return null;
    }
}

TableInfo

package com.example.jpacodegenerator;


import lombok.Data;

import java.util.List;

/**
 * @author JunHao Huang
 * @since 2023/6/8 15:09
 */
@Data
public class TableInfo {

    private List columnList;
}

模板

controller.vm

package ${basePackage}.${moduleName}.controller;

#foreach($importClass in $importClasses)
import ${importClass};
#end

/**
* ${tableDesc}
*
* @author ${author}
*/
@RestController
@AllArgsConstructor
@RequestMapping("/${baseUrl}")
@Api(value = "${apiValue}", tags = "${apiTag}")
public class ${className}Controller extends BasicController {

    private ${className}Service ${classNameSmart}Service;

    /**
    * 详情
    */
    @GetMapping("/detail")
    @ApiOperationSupport(order = 1)
    @ApiOperation(value = "详情", notes = "传入${classNameSmart}")
    public R <${classVOName}> detail(${className} ${classNameSmart}) {
        ${className} detail = ${classNameSmart}Service.getOne(Condition.getQueryWrapper(${classNameSmart}));
        return R.data(detail == null ? null : BeanUtil.copy(detail, ${classVOName}.class));
    }

    /**
    * 分页
    */
    @GetMapping("/list")
    @ApiOperationSupport(order = 2)
    @ApiOperation(value = "分页", notes = "传入${classNameSmart}")
    public R> list(${className} ${classNameSmart}, Query query) {
        IPage<${className}> pages = ${classNameSmart}Service.page(Condition.getPage(query), Condition.getQueryWrapper(${classNameSmart}));
        IPage<${classVOName}> page = new Page<>();
        BeanUtil.copy(pages, page);
        page.setRecords(pages.getRecords().stream().map(p -> BeanUtil.copy(p,${classVOName}.class)).collect(Collectors.toList()));
        return R.data(page);
    }


    /**
    * 自定义分页
    */
    @GetMapping("/page")
    @ApiOperationSupport(order = 3)
    @ApiOperation(value = "分页", notes = "传入${classNameSmart}")
        public R> page(${classVOName} ${classVONameSmart}, Query query) {
        IPage<${classVOName}> pages = ${classNameSmart}Service.select${className}Page(Condition.getPage(query), ${classVONameSmart});
        return R.data(pages);
    }

    /**
    * 新增
    */
    @PostMapping("/save")
    @ApiOperationSupport(order = 4)
    @ApiOperation(value = "新增", notes = "传入${classNameSmart}")
    public R save(@Valid @RequestBody ${className} ${classNameSmart}) {
        return R.status(${classNameSmart}Service.save(${classNameSmart}));
    }

    /**
    * 修改 打卡规则表
    */
    @PostMapping("/update")
    @ApiOperationSupport(order = 5)
    @ApiOperation(value = "修改", notes = "传入${classNameSmart}")
    public R update(@Valid @RequestBody ${className} ${classNameSmart}) {
        return R.status(${classNameSmart}Service.updateById(${classNameSmart}));
    }

    /**
    * 新增或修改 打卡规则表
    */
    @PostMapping("/submit")
    @ApiOperationSupport(order = 6)
    @ApiOperation(value = "新增或修改", notes = "传入${classNameSmart}")
    public R submit(@Valid @RequestBody ${className} ${classNameSmart}) {
        return R.status(${classNameSmart}Service.saveOrUpdate(${classNameSmart}));
    }


    /**
    * 删除 打卡规则表
    */
    @PostMapping("/remove")
    @ApiOperationSupport(order = 7)
    @ApiOperation(value = "逻辑删除", notes = "传入ids")
    public R remove(@ApiParam(value = "主键集合", required = true) @RequestBody String ids) {
        return R.status(${classNameSmart}Service.deleteLogic(Func.toStrList(ids)));
    }


}

entity.vm

package ${basePackage}.${moduleName}.entity;

#foreach($importClass in $importClasses)
import ${importClass};
#end

/**
* ${tableDesc}
*
* @author ${author}
*/
@Data
@EqualsAndHashCode(callSuper = true)
@TableName("${mysqlTableName}")
public class ${className} extends BaseEntity {

    #foreach($field in $tableInfo.columnList)
    /** $field.remarks */
    private ${field.javaType} ${field.propertyName};
    #end

}

impl.vm

package ${basePackage}.${moduleName}.service.impl;

#foreach($importClass in $importClasses)
import ${importClass};
#end

/**
* ${tableDesc}
*
* @author ${author}
*/
@Service
public class ${className}ServiceImpl extends BaseServiceImpl<${className}Mapper, ${className}> implements ${className}Service {

    @Override
    public IPage<${classVOName}> select${className}Page(IPage<${classVOName}> page, ${classVOName} ${classVONameSmart}) {
        return page.setRecords(baseMapper.select${classVOName}Page(page, ${classVONameSmart}));
    }
}

mapper.vm

package ${basePackage}.${moduleName}.mapper;

#foreach($importClass in $importClasses)
import ${importClass};
#end

/**
* ${tableDesc}
*
* @author ${author}
*/
public interface ${className}Mapper extends BaseMapper<${className}> {

    /**
    * 自定义分页
    *
    * @param page 分页条件
    * @param ${classVONameSmart} 查询条件
    * @return   List<${classVOName}>
    */
    List<${classVOName}> select${classVOName}Page(IPage page, ${classVOName} ${classVONameSmart});
}

service.vm

package ${basePackage}.${moduleName}.service;

#foreach($importClass in $importClasses)
import ${importClass};
#end

/**
* ${tableDesc}
*
* @author ${author}
*/
public interface ${className}Service extends BaseService<${className}> {

    /**
    * 自定义分页
    *
    * @param page 分页数据
    * @param ${classVONameSmart} 查询条件
    * @return   IPage<${classVOName}>
    */
    IPage<${classVOName}> select${className}Page(IPage<${classVOName}> page, ${classVOName} ${classVONameSmart});
}

vo.vm

package ${basePackage}.${moduleName}.vo;


#foreach($importClass in $importClasses)
import ${importClass};
#end

/**
* ${tableDesc}
*
* @author ${author}
*/
@Data
@EqualsAndHashCode(callSuper = true)
public class ${className}VO extends ${className} {

    private static final long serialVersionUID = 1L;
}

xml.vm

    
    
        
        
        
        
        
        
        
    


    
        select * from ${tableName} where is_deleted = 0
    

结语

请根据公司代码规范生成对应的模板