easy Exsel导出

一、首先引入依赖

二、然后封装一个VO

三、Controller层

四、Service实现类

引用样式

自适应列宽

自适应行高

五、测试

postman

编辑

浏览器

异常

分配到这个任务了，写个小demo记录下，具体可参考EasyExcel官方文档

我用的是web上传、下载那块代码

一、首先引入依赖

        <!--    easy Excel    --><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.1.0</version><exclusions><exclusion><artifactId>poi-ooxml-schemas</artifactId><groupId>org.apache.poi</groupId></exclusion></exclusions></dependency>

二、然后封装一个VO

@Data
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode
public class ExportStudentInfoVO implements Serializable {private static final long serialVersionUID = -3275970951989418695L;@ExcelIgnore // 忽略导出private String stuId;@ExcelProperty("学生姓名")private String stuName;@ExcelProperty("学生性别")private String stuGender;@ExcelProperty("学生年龄")private Integer stuAge;@ExcelProperty("监护人联系方式")private String guardianPhone;@DateTimeFormat("yyyy-MM-dd HH:mm:ss")@ColumnWidth(21) //设置宽度@ExcelProperty(value = "入学时间")private Date createDate;
}

三、Controller层

@RestController
@RequestMapping("info")
public class InfoController {@Resourceprivate InfoService infoService;@Operation(summary = "学生信息导出")@RequestMapping(value = "/excelDownload", method = RequestMethod.GET, produces = "application/json; charset=utf-8")public void excelOrderContainerDownload(HttpServletResponse response){infoService.excelDownload(response);}}

四、Service实现类

这里的list，模拟从DB中查到的数据

.registerWriteHandler(new CustomCellWriteWidthConfig()) /*自适应列宽*/
.registerWriteHandler(new CustomCellWriteHeightConfig()) /*自适应行高*/
.registerWriteHandler(EasyExcelUtils.getStyleStrategy()) /*引用样式*/

以上三个是excel表格进行一个处理，让其看起来更加美观，如果要使用可以往下翻对应的代码复制使用，不加也不影响导出

@Service
@Slf4j
public class InfoServiceImpl  implements InfoService {@Overridepublic void excelDownload(HttpServletResponse response) {List<ExportStudentInfoVO> list = new ArrayList<>();list.add(new ExportStudentInfoVO("001","张三","男",18,"18488789989", new Date()));list.add(new ExportStudentInfoVO("002","李四","女",21,"15233337777", new Date()));list.add(new ExportStudentInfoVO("003","王五","男",19,"15623332333", new Date()));try {response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd");String currentDate = sdf.format(new Date());// URLEncoder.encode 可以防止中文乱码String fileName = URLEncoder.encode("学生信息列表" + currentDate, "UTF-8").replaceAll("\\+", "%20");response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");EasyExcel.write(response.getOutputStream(), ExportStudentInfoVO.class).sheet("学生信息").registerWriteHandler(new CustomCellWriteWidthConfig()) /*自适应列宽*/.registerWriteHandler(new CustomCellWriteHeightConfig()) /*自适应行高*/.registerWriteHandler(EasyExcelUtils.getStyleStrategy()) /*引用样式*/.doWrite(list);} catch (Exception e) {log.error("导出失败~");e.printStackTrace();}}}

引用样式

package cn.homed.common.utils.excel;import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.VerticalAlignment;public class EasyExcelUtils {/*** 设置excel样式*/public static HorizontalCellStyleStrategy getStyleStrategy() {// 头的策略  样式调整WriteCellStyle headWriteCellStyle = new WriteCellStyle();// 头背景 浅绿headWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());WriteFont headWriteFont = new WriteFont();// 头字号headWriteFont.setFontHeightInPoints((short) 12);// 字体样式headWriteFont.setFontName("宋体");headWriteCellStyle.setWriteFont(headWriteFont);// 自动换行headWriteCellStyle.setWrapped(true);// 设置细边框headWriteCellStyle.setBorderBottom(BorderStyle.THIN);headWriteCellStyle.setBorderLeft(BorderStyle.THIN);headWriteCellStyle.setBorderRight(BorderStyle.THIN);headWriteCellStyle.setBorderTop(BorderStyle.THIN);// 设置边框颜色 25灰度headWriteCellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());headWriteCellStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());headWriteCellStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());headWriteCellStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());// 水平对齐方式headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 垂直对齐方式headWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 内容的策略 宋体WriteCellStyle contentStyle = new WriteCellStyle();// 设置垂直居中contentStyle.setWrapped(true);contentStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 设置 水平居中
//        contentStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);WriteFont contentWriteFont = new WriteFont();// 内容字号contentWriteFont.setFontHeightInPoints((short) 12);// 字体样式contentWriteFont.setFontName("宋体");contentStyle.setWriteFont(contentWriteFont);// 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现return new HorizontalCellStyleStrategy(headWriteCellStyle, contentStyle);}
}

自适应列宽

package cn.homed.common.utils.excel;import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.CellData;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.commons.collections.CollectionUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;import java.util.HashMap;
import java.util.List;
import java.util.Map;public class CustomCellWriteWidthConfig extends AbstractColumnWidthStyleStrategy {private final Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();@Overrideprotected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer integer, Boolean isHead) {boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);if (needSetWidth) {Map<Integer, Integer> maxColumnWidthMap = CACHE.computeIfAbsent(writeSheetHolder.getSheetNo(), k -> new HashMap<>());Integer columnWidth = this.dataLength(cellDataList, cell, isHead);// 单元格文本长度大于60换行if (columnWidth >= 0) {if (columnWidth > 60) {columnWidth = 60;}Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());if (maxColumnWidth == null || columnWidth > maxColumnWidth) {maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);Sheet sheet = writeSheetHolder.getSheet();sheet.setColumnWidth(cell.getColumnIndex(), columnWidth * 256);}}}}/*** 计算长度* @param cellDataList* @param cell* @param isHead* @return*/private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {if (isHead) {return cell.getStringCellValue().getBytes().length;} else {CellData<?> cellData = cellDataList.get(0);CellDataTypeEnum type = cellData.getType();if (type == null) {return -1;} else {switch (type) {case STRING:// 换行符（数据需要提前解析好）int index = cellData.getStringValue().indexOf("\n");return index != -1 ?cellData.getStringValue().substring(0, index).getBytes().length + 1 : cellData.getStringValue().getBytes().length + 1;case BOOLEAN:return cellData.getBooleanValue().toString().getBytes().length;case NUMBER:return cellData.getNumberValue().toString().getBytes().length;default:return -1;}}}}
}

自适应行高

package cn.homed.common.utils.excel;import com.alibaba.excel.write.style.row.AbstractRowHeightStyleStrategy;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;import java.util.Iterator;public class CustomCellWriteHeightConfig extends AbstractRowHeightStyleStrategy {/*** 默认高度*/private static final Integer DEFAULT_HEIGHT = 300;@Overrideprotected void setHeadColumnHeight(Row row, int relativeRowIndex) {}@Overrideprotected void setContentColumnHeight(Row row, int relativeRowIndex) {Iterator<Cell> cellIterator = row.cellIterator();if (!cellIterator.hasNext()) {return;}// 默认为 1行高度int maxHeight = 1;while (cellIterator.hasNext()) {Cell cell = cellIterator.next();if (cell.getCellTypeEnum() == CellType.STRING) {String value = cell.getStringCellValue();int len = value.length();int num = 0;if (len > 50) {num = len % 50 > 0 ? len / 50 : len / 2 - 1;}if (num > 0) {for (int i = 0; i < num; i++) {value = value.substring(0, (i + 1) * 50 + i) + "\n" + value.substring((i + 1) * 50 + i, len + i);}}if (value.contains("\n")) {int length = value.split("\n").length;maxHeight = Math.max(maxHeight, length) + 1;}}}row.setHeight((short) ((maxHeight) * DEFAULT_HEIGHT));}
}

五、测试

测试的话可以用postman进行测试，或者把链接粘在浏览器上

postman

postman测试的时候记得点这个下拉框选择发送并下载

然后弹出这个界面点击保存

然后桌面上就可以看到已经成功的下载下来了，数据也都是没问题的

浏览器

直接贴链接即可

可以看到数据也是没问题的

异常

最后讲一下，刚开始我这个小demo没跑起来，编译、运行都没问题，一调接口就报错了

异常是 com.alibaba.excel.exception.ExcelGenerateException: java.lang.NoClassDefFoundError: org/apache/xmlbeans/impl/common/SystemCache

搜了一下是由于缺少了相关的依赖库或者版本不匹配所致，可能需要添加 Apache POI 或者 XMLBeans 这些依赖库，并且确保版本号是兼容的。

然后加上这两个依赖就可以了，不知道你们有没有遇到

        <dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.1.2</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.1.2</version></dependency>

好了，分享就到这里，晚安