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业务-EasyExcel多sheet、追加列

背景

最近接到一个导出Excel的业务，需求就是多sheet，每个sheet导出不同结构，第一个sheet里面能够根据最后一列动态的追加列，追加多少得看运营人员传了多少需求列。原本使用的 pig4cloud 架子，使用 @ResponseExcel注解方式组装返回数据即可，但是实现过程中发现并不是所想要的效果。

组件地址：https://github.com/pig-mesh/excel-spring-boot-starter

这样写能够实现多 sheet 导出，但是动态的移除列然后在追加列我尝试了并没有好的方案，有可能也是我没有找到，我找到的是下面面动态的修改列名称。

多 sheet导出，只需要返 List<List> 即可。

@ResponseExcel(name = "不同Sheet的导出", sheet = {"sheet1", "sheet2"})
@PostMapping("/export")
public List<List> export(@RequestBody queryModel model) {model.setSize(-1);return userService.userExcelList(model);
}

导出并自定义头信息

@Data
public class SimpleData {@ExcelProperty("字符串标题")private String string;@ExcelProperty("日期标题")private Date date;@ExcelProperty("数字标题")private Integer number;// 忽略@ExcelIgnoreprivate String ignore;
}

自定义头信息生成器：

注意需要实现 HeadGenerator 接口，且注册为一个 spring bean.

@Component
public class SimpleDataHeadGenerator implements HeadGenerator {@Overridepublic HeadMeta head(Class<?> clazz) {HeadMeta headMeta = new HeadMeta();headMeta.setHead(simpleDataHead());// 排除 number 属性headMeta.setIgnoreHeadFields(new HashSet<>(Collections.singletonList("number")));return headMeta;}private List<List<String>> simpleDataHead() {List<List<String>> list = new ArrayList<>();List<String> head0 = new ArrayList<>();head0.add("自定义字符串标题" + System.currentTimeMillis());List<String> head1 = new ArrayList<>();head1.add("自定义日期标题" + System.currentTimeMillis());list.add(head0);list.add(head1);return list;}
}

该头生成器，将固定返回 自定义字符串标题 和 自定义日期标题 两列头信息，实际使用时可根据业务动态处理，方便在一些权限控制时动态修改或者增删列头。

@RequestMapping("/head")
@RestController
public class ExcelHeadTestController {@ResponseExcel(name = "customHead", headGenerator = SimpleDataHeadGenerator.class)@GetMappingpublic List<SimpleData> multi() {List<SimpleData> list = new ArrayList<>();for (int i = 0; i < 10; i++) {SimpleData simpleData = new SimpleData();simpleData.setString("str" + i);simpleData.setNumber(i);simpleData.setDate(new Date());list.add(simpleData);}return list;}
}

那就只能放弃使用组件方式，自己写 EasyExcel 拦截器。

代码实现

导出工具

exHealthSheetDy 静态方法如下，实现了 2 个 sheet 不同结构导出。

/*** 2 sheet 动态追加列** @param response      响应* @param dataMap       dataMap* @param fileName      Excel名称* @param sheetNameList sheet名称* @throws Exception Exception*/
public static void exHealthSheetDy(HttpServletResponse response, Map<Integer, List<? extends Object>> dataMap, String fileName, List<String> sheetNameList, List<String> labelGroupName) throws Exception {// 表头样式WriteCellStyle headWriteCellStyle = new WriteCellStyle();// 设置表头居中对齐headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 内容样式WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 设置内容剧中对齐contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);ExcelWriter build = EasyExcel.write(getOutputStream(fileName, response)).excelType(ExcelTypeEnum.XLSX).registerWriteHandler(horizontalCellStyleStrategy).build();for (String s : sheetNameList) {WriteSheet writeSheet;if (s.equals("风险")) {// 风险writeSheet = EasyExcel.writerSheet(s).head(HealthUserOneExcelVo.class).registerWriteHandler(new LabelGroupNameRowWriteHandler(labelGroupName)).build();build.write(dataMap.get(0), writeSheet);} else {// 指标writeSheet = EasyExcel.writerSheet(s).head(HealthUserExcelIndexVo.class).build();build.write(dataMap.get(1), writeSheet);}}build.finish();
}private static OutputStream getOutputStream(String fileName, HttpServletResponse response) throws Exception {fileName = URLEncoder.encode(fileName, "UTF-8");response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf8");response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");return response.getOutputStream();
}

拦截器

业务需求是根据 13 列切割根据传入的要求集合追加列。

import cn.hutool.core.util.StrUtil;
import com.alibaba.excel.write.handler.RowWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;/*** 行拦截器 将字符串换成多列数据** @author William*/
@Slf4j
public class LabelGroupNameRowWriteHandler implements RowWriteHandler {/*** 样式，与其他列保持一样的样式*/private CellStyle firstCellStyle;/*** 体检标签分组列表*/private List<String> labelGroupName;public LabelGroupNameRowWriteHandler(List<String> labelGroupName) {this.labelGroupName = labelGroupName;}/*** 字符串转*/@Overridepublic void afterRowDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Integer integer, Boolean isHead) {// ONE 13 行, 我的是 13 列 具体根据自己的 Excel 定位Cell cell = row.getCell(13);row.removeCell(cell);Map<String, Cell> map = new LinkedHashMap<>();int cellIndex = 0;for (int i = 0; i < labelGroupName.size(); i++) {if (StrUtil.isBlank(labelGroupName.get(i)) || map.containsKey(labelGroupName.get(i))) {continue;}Cell fi = row.createCell(cellIndex + 13);map.put(labelGroupName.get(i), fi);cellIndex++;}if (!isHead) {String stringCellValue = cell.getStringCellValue();try {String[] split = stringCellValue.split(",");for (Map.Entry<String, Cell> stringCellEntry : map.entrySet()) {boolean equalsRes = false;for (String s : split) {if (stringCellEntry.getKey().equals(s)) {equalsRes = true;break;}}if (equalsRes) {stringCellEntry.getValue().setCellValue("有");} else {stringCellEntry.getValue().setCellValue("无");}}} catch (Exception e) {log.error("afterRowDispose Exception:{}", e.getMessage(), e);}} else {Workbook workbook = writeSheetHolder.getSheet().getWorkbook();firstCellStyle = firstCellStyle(workbook);for (Map.Entry<String, Cell> stringCellEntry : map.entrySet()) {stringCellEntry.getValue().setCellValue(stringCellEntry.getKey());stringCellEntry.getValue().setCellStyle(firstCellStyle);}}}/*** excel列样式** @param workbook Workbook* @return CellStyle*/public CellStyle firstCellStyle(Workbook workbook) {CellStyle cellStyle = workbook.createCellStyle();// 居中cellStyle.setAlignment(HorizontalAlignment.CENTER);cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);//  灰色cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());// 设置边框cellStyle.setBorderBottom(BorderStyle.THIN);cellStyle.setBorderLeft(BorderStyle.THIN);cellStyle.setBorderRight(BorderStyle.THIN);cellStyle.setBorderTop(BorderStyle.THIN);// 文字Font font = workbook.createFont();font.setFontHeightInPoints((short) 14);font.setFontName("宋体");font.setBold(Boolean.TRUE);cellStyle.setFont(font);return cellStyle;}@Overridepublic void beforeRowCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Integer integer, Integer integer1, Boolean aBoolean) {}@Overridepublic void afterRowCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Integer integer, Boolean aBoolean) {}
}