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首先展示导出结果，如图所示：
编辑 
编辑
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 @Override public 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 Excel ExcelUtils.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(",");
