JAVA实现编写平台代码生成器
[项目中经常写CRUD，但实际这些工作，我觉得如果有一个完整的代码规范，完全可以自动生成，加快开发效率. 代码生成器技术原理不复杂，一般就是写好一个模板生成一系列的代码而已。我看到mybatis_plus的代码生成器就相当不错，就自己拿过来改造了一下 1.项目中，需先引入vm库，用来生成代码 <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity</artifactId> <version>${velocity.version}</version> </dependency> 2.model的代码如下 /** * <p> * 考试题目表 * </p> * * @author starmark * @since 2018-04-12 */ @Data @EqualsAndHashCode(callSuper=false) public class Exam implements Serializable { /** * 主键 */ @TableId("id") private Long id; /** * 题目 */ @TableField("subject") private String subject; /** * 答案 */ @TableField("answer") private String answer; /** * 类别 */ @TableField("category") private String category; @TableField("key_point") private String keyPoint; @TableField("created_by") private String createdBy; @TableField("created_date") private Date createdDate; @TableField("last_updated_by") private String lastUpdatedBy; @TableField("last_updated_date") private Date lastUpdatedDate; } vm就改造成如下： package ${package.Entity}; #if(${activeRecord}) import lombok.Data; import lombok.EqualsAndHashCode; #end #foreach($pkg in ${table.importPackages}) import ${pkg}; #end /** * <p> * ${table.comment} * </p> * * @author ${author} * @since ${date} */ ${data} ${EqualsAndHashCode} #if(${table.convert}) @TableName("${table.name}") #end #if(${superEntityClass}) public class ${entity} extends ${superEntityClass}#if(${activeRecord})<${entity}>#end { #elseif(${activeRecord}) public class ${entity} implements Serializable { #else public class ${entity} implements Serializable { #end #foreach($field in ${table.fields}) #if(${field.keyFlag}) #set($keyPropertyName=${field.propertyName}) #end #if("$!field.comment" != "") /** * ${field.comment} */ #end #if(${field.convert}) #if(${field.keyFlag}) @TableId("${field.name}") #else @TableField("${field.name}") #end #end private ${field.propertyType} ${field.propertyName}; #end } 2.ServiceImpl实现类如下： import com.starmark.exam.entity.Exam; import com.starmark.exam.mapper.ExamMapper; import com.starmark.exam.service.IExamService; import com.starmark.core.base.AbstractBaseService; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import org.springframework.transaction.annotation.Propagation; /** * <p> * 考试题目表 服务实现类 * </p> * * @author starmark * @since 2018-04-12 */ @Service @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) public class ExamServiceImpl extends AbstractBaseService<ExamMapper, Exam> implements IExamService { } VM就写成如下： 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.transaction.annotation.Transactional; import org.springframework.transaction.annotation.Propagation; /** * <p> * ${table.comment} 服务实现类 * </p> * * @author ${author} * @since ${date} */ @Service @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) public class ${table.serviceImplName} extends ${superServiceImplClass}<${table.mapperName}, ${entity}> implements ${table.serviceName} { } 3.Controller实现类如下： import io.swagger.annotations.ApiOperation; import com.starmark.common.base.PageVo; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import com.starmark.core.web.base.AbstractBaseController; /** * <p> * 考试题目表 前端控制器 * </p> * * @author starmark * @since 2018-04-12 */ @RestController @RequestMapping("/exam/exam") public class ExamController extends AbstractBaseController<IExamService> { @ApiOperation(value = "查询考试题目表列表") @PutMapping(value = "/page") public Object query(@RequestBody PageVo pageVo) { return super.queryPage(pageVo); } @ApiOperation(value = "新增考试题目表") @PostMapping public Object add(@RequestBody SysOrgDept param) { return super.add(param); } @ApiOperation(value = "考试题目表详情") @GetMapping(value = "/{id}") public Object get(@PathVariable("id") Long id) { return super.get(id); } @PutMapping @ApiOperation(value = "修改考试题目表") public Object update(@RequestBody Exam param) { return super.update(param); } @DeleteMapping(value = "/{id}") @ApiOperation(value = "删除考试题目表") public Object delete(@PathVariable("id") Long id) { return super.delete(id); } } VM就编写如下： package ${package.Controller}; import io.swagger.annotations.ApiOperation; import com.starmark.common.base.PageVo; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; #if(${superControllerClassPackage}) import ${superControllerClassPackage}; #end /** * <p> * ${table.comment} 前端控制器 * </p> * * @author ${author} * @since ${date} */ @RestController @RequestMapping("#if(${package.ModuleName})/${package.ModuleName}#end/${table.entityPath}") #if(${superControllerClass}) public class ${table.controllerName} extends ${superControllerClass}<${table.serviceName}> { #else public class ${table.controllerName} { #end @ApiOperation(value = "查询${table.comment}列表") @PutMapping(value = "/page") public Object query(@RequestBody PageVo pageVo) { return super.queryPage(pageVo); } @ApiOperation(value = "新增${table.comment}") @PostMapping public Object add(@RequestBody SysOrgDept param) { return super.add(param); } @ApiOperation(value = "${table.comment}详情") @GetMapping(value = "/{id}") public Object get(@PathVariable("id") Long id) { return super.get(id); } @PutMapping @ApiOperation(value = "修改${table.comment}") public Object update(@RequestBody ${entity} param) { return super.update(param); } @DeleteMapping(value = "/{id}") @ApiOperation(value = "删除${table.comment}") public Object delete(@PathVariable("id") Long id) { return super.delete(id); } } 以上就是各个类之间对应的模板。 代码就是通过读数据库的表信息，含字段名称，注解难来生成相关的文件。 现在我项目开发是通过代码生成器生成代码，然后中途加字段是通过我另一文章给mybatis添加自动建表，自动加字段的功能来加字段。 如果想要完整的代码生成器，请打赏一注彩票钱再联系我。
