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首先展示导出结果，如图所示：
代码展示：
导出实体类：
由于不想和DO混用，就单独为导出的字段建立实体类，一方面是容易使用 @ExcelProperty注解，方便观察，另一方面是有些字段在数据库存的是业务字典的value，是Integer类型，我需要再定义一个String类型的字段来接收于业务字典匹配完成后的label的值并完成导出。
package com.todod.education.module.hr.controller.admin.teachermanage.vo;import com.alibaba.excel.annotation.ExcelIgnoreUnannotated;
import com.alibaba.excel.annotation.ExcelProperty;
import io.swagger.v3.oas.annotations.media.Schema;
import lombok.Data;
import lombok.ToString;@Schema(description = "管理后台 - 教师信息导出管理 Response VO")
@Data
@ExcelIgnoreUnannotated
@ToString(callSuper = true)
public class TeacherExportRespVO {@Schema(description = "教师姓名", example = "赵六")@ExcelProperty("教师姓名")private String teacherName;@Schema(description = "手机号", example = "赵六")@ExcelProperty("手机号")private String phone;@Schema(description = "性别", example = "赵六")@ExcelProperty("性别")private String teacherSexExport;@Schema(description = "科目", example = "赵六")@ExcelProperty("科目")private String teacherSubjectExport;@Schema(description = "教师学段", example = "赵六")@ExcelProperty("教师学段")private String teacherStageExport;@Schema(description = "课补级别", example = "赵六")@ExcelProperty("课补级别")private Integer supplyLevel;@Schema(description = "就职状态", example = "赵六")@ExcelProperty("就职状态")private String teacherJobStatusExport;}
实体类DO字段：
/*** 性别（导出）*/@TableField(exist = false)private String teacherSexExport;/*** 科目（导出）*/@TableField(exist = false)private String teacherSubjectExport;/*** 教师学段（导出）*/@TableField(exist = false)private String teacherStageExport;/*** 就职状态（导出）*/@TableField(exist = false)private String teacherJobStatusExport;Service：
/*** 教师信息导出** @param* @return*/PageResult<TeacherManageDO> getTeacherExportData(TeacherManagePageReqVO pageReqVO);ServiceImpl：
//教师信息导出@Overridepublic PageResult<TeacherManageDO> getTeacherExportData(TeacherManagePageReqVO pageReqVO) {PageResult<TeacherManageDO> teacherManageDOPageResult = teacherManageMapper.selectPage(pageReqVO);List<TeacherManageDO> list = teacherManageDOPageResult.getList();for (TeacherManageDO teacherManageDO : list) {if(teacherManageDO.getTeacherSex() == null){teacherManageDO.setTeacherSex("");}else {CommonResult<DictDataRespDTO> dictDataRespDTO = dictDataApi.getDictData("system_user_sex", teacherManageDO.getTeacherSex());if (dictDataRespDTO != null){teacherManageDO.setTeacherSexExport(dictDataRespDTO.getData().getLabel());}}if(teacherManageDO.getTeacherSubject() == null){teacherManageDO.setTeacherSubject("");}else{String teacherSubject = teacherManageDO.getTeacherSubject();teacherSubject = teacherSubject.replace("[", "").replace("]", "");String[] parts = teacherSubject.split(", ");StringBuilder teacherSubjectNew = new StringBuilder();for (int i = 0; i < parts.length; i++) {CommonResult<DictDataRespDTO> dictDataRespDTO2 = dictDataApi.getDictData("subject", parts[i]);if (dictDataRespDTO2 != null && dictDataRespDTO2.getData() != null) {if (i< parts.length-1){teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel()).append(",");}else {teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel());}}}// 最后，如果需要移除最后一个逗号，可以检查字符串并移除if (teacherSubjectNew.length() > 0 && teacherSubjectNew.charAt(teacherSubjectNew.length() - 1) == ',') {teacherSubjectNew.charAt(teacherSubjectNew.length() - 1); // 移除最后一个逗号}teacherManageDO.setTeacherSubjectExport(teacherSubjectNew.toString());}if(teacherManageDO.getTeacherStage() == null){teacherManageDO.setTeacherStage("");}else{CommonResult<DictDataRespDTO> dictDataRespDTO3 = dictDataApi.getDictData("public_teacher_stage", teacherManageDO.getTeacherStage());if (dictDataRespDTO3 != null){teacherManageDO.setTeacherStageExport(dictDataRespDTO3.getData().getLabel());}}if(teacherManageDO.getJobStatus() == null){teacherManageDO.setJobStatus("");}else{CommonResult<DictDataRespDTO> dictDataRespDTO4 = dictDataApi.getDictData("hr_status", teacherManageDO.getJobStatus());if (dictDataRespDTO4 != null){teacherManageDO.setTeacherJobStatusExport(dictDataRespDTO4.getData().getLabel());}}}return teacherManageDOPageResult;}Controller：
@GetMapping("/export-excel")@Operation(summary = "导出教师管理 Excel")@PreAuthorize("@ss.hasPermission('hr:teacher-manage:export')")@ApiAccessLog(operateType = EXPORT)public void exportTeacherManageExcel(@Valid TeacherManagePageReqVO pageReqVO,HttpServletResponse response) throws IOException {pageReqVO.setPageSize(PageParam.PAGE_SIZE_NONE);List<TeacherManageDO> list = teacherManageService.getTeacherExportData(pageReqVO).getList();// 导出 ExcelExcelUtils.write(response, "教师管理.xls", "数据", TeacherExportRespVO.class,BeanUtils.toBean(list, TeacherExportRespVO.class));}下面我们来拆解一下实现类。
场景：由于业务需求的变化，老师的科目由单个变成了多个，我在存储的时候存储的是数组的字符串，类似于：“[103, 202, 203, 204]”，这就需要去掉左右两侧[]以及拆分成字符串数组再与业务字典进行匹配。
主要就是这句话，让我们来看一下：
if(teacherManageDO.getTeacherSubject() == null){teacherManageDO.setTeacherSubject("");}else{String teacherSubject = teacherManageDO.getTeacherSubject();teacherSubject = teacherSubject.replace("[", "").replace("]", "");String[] parts = teacherSubject.split(", ");StringBuilder teacherSubjectNew = new StringBuilder();for (int i = 0; i < parts.length; i++) {CommonResult<DictDataRespDTO> dictDataRespDTO2 = dictDataApi.getDictData("subject", parts[i]);if (dictDataRespDTO2 != null && dictDataRespDTO2.getData() != null) {if (i< parts.length-1){teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel()).append(",");}else {teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel());}}}// 最后，如果需要移除最后一个逗号，可以检查字符串并移除if (teacherSubjectNew.length() > 0 && teacherSubjectNew.charAt(teacherSubjectNew.length() - 1) == ',') {teacherSubjectNew.charAt(teacherSubjectNew.length() - 1); // 移除最后一个逗号}teacherManageDO.setTeacherSubjectExport(teacherSubjectNew.toString());}if(teacherManageDO.getTeacherSubject() == null){
teacherManageDO.setTeacherSubject("");
}
如果科目为空的话就是空字符串插入到excel表里，如果不为空则走else。
String teacherSubject = teacherManageDO.getTeacherSubject();
teacherSubject = teacherSubject.replace("[", "").replace("]", "");
String[] parts = teacherSubject.split(", ");
StringBuilder teacherSubjectNew = new StringBuilder();
这里定义了一个String类型的teacherSubject，为了接收去掉左右括号【】的字符串，又定义了一个Sting类型的数组parts，接收逗号分割以后的teacherSubject字符串，让它变成数组，然后开始for循环遍历。
for (int i = 0; i < parts.length; i++) {
CommonResult<DictDataRespDTO> dictDataRespDTO2 = dictDataApi.getDictData("subject", parts[i]);
if (dictDataRespDTO2 != null && dictDataRespDTO2.getData() != null) {
if (i< parts.length-1){
teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel()).append(",");
}
else {
teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel());
}}
}
(这里最开始我用的增强for循环，但是发现增强for循环不容易去掉最后一个逗号，最后一个逗号依旧会拼接到字符串里，所以又改成了普通for循环)
循环遍历parts里面的每一个值，让这个值去业务字典里找与之对应的唯一的一个label
CommonResult<DictDataRespDTO> dictDataRespDTO2 = dictDataApi.getDictData("subject", parts[i]);
如果这个label不为空，也就是找到的话，就复制给要导出的这个teacherSubjectNew字段
if (dictDataRespDTO2 != null && dictDataRespDTO2.getData() != null) {
if (i< parts.length-1){
teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel()).append(",");
}
这里要注意的是如果到了最后一个元素的时候我们选择走else也就是不在拼接逗号，如果没有到最后一个元素我们就拼接逗号。
if (dictDataRespDTO2 != null && dictDataRespDTO2.getData() != null) {if (i< parts.length-1){teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel()).append(",");}else {teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel());}}最后再赋值给TeacherSubjectExport即可。
teacherManageDO.setTeacherSubjectExport(teacherSubjectNew.toString());
痛点：
在split（", "）的时候一定要注意好这个逗号是有空格的！！！！不能直接split（","），否则后面所有的值都识别不到了，他就会优先识别空格，一定要注意。
teacherSubjectNew.append(dictDataRespDTO2.getData().getLabel()).append(",");
