easyexcel 第一次导入导出会报错com.alibaba.excel.exception.ExcelAnalysisException，所以自定义excel导入导出表格

报错原因

由于easyexcel导入导出时如果存在null会报错，跟踪源码com.alibaba.excel.analysis.v07.XlsxSaxAnalyser#parseXmlSource，查看xmlReader.parse，发现这里try了没啥卵用，第一次启动导入或者导出时，有null值一样报错。因为excel有空值，不能直接用，所以我自定义了一个excel的导入导出

自定义excel导入导出

导入pom依赖，easyexcel包含了apache.poi的依赖

        <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>2.2.6</version></dependency>

自定义注解ExcelColumn 用来处理excel的导入导出：

package com.xxx.core.anno;
import org.springframework.core.annotation.AliasFor;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;import java.lang.annotation.*;/*** excel导出表格注解** @author ：seagull* @date ：Created in 2022/7/12* @description：* @modified By：*/
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ExcelColumn {String name() default "";@AliasFor("name")String value() default "";}

一个model类，使用自定义注解提供表格标题信息

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
@TableName("sys_dictionary")
public class Dictionary implements Serializable {/*** ID*/@TableId(value = "id", type = IdType.AUTO)@ExcelColumn("ID")private Integer id;/*** 字典名称*/@TableField(value = "name")@ExcelColumn("字典名称")private String name;/*** 父id*/@TableField(value = "pid")@ExcelColumn("父id")private Integer pid;/*** 排序*/@TableField(value = "num")@ExcelColumn("排序")private Integer num;/*** 提示*/@TableField(value = "tips")@ExcelColumn("提示")private String tips;@TableField(exist = false)private List<Dictionary> dictionaryList;}

创建一个excel工具类

package com.xxx.core.utils;import com.xxx.core.anno.ExcelColumn;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.net.URLEncoder;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;/*** excel工具类** @author ：seagull* @date ：Created in 2022/7/12* @description：* @modified By：*/
public class ExcelUtil {/*** 导入excel** @param file* @param <T>* @return*/public static <T> List<T> importExcel(MultipartFile file, Class<?> clazz) throws IOException, InstantiationException, IllegalAccessException, ParseException {List<T> list = new ArrayList<>();XSSFWorkbook sheets = new XSSFWorkbook(file.getInputStream());//读取文件//获取sheetXSSFSheet sheet = sheets.getSheetAt(0);XSSFRow firstRow = sheet.getRow(0);int firstRowLength = firstRow.getPhysicalNumberOfCells();/*首行名称列表*/List<String> firstRowCellList = new ArrayList<>();for (int i = 0; i < firstRowLength; i++) {String firstRowCellValue = firstRow.getCell(i).toString();firstRowCellList.add(firstRowCellValue);}//获取行数int rows = sheet.getPhysicalNumberOfRows();for (int i = 1; i < rows; i++) {//获取列数XSSFRow row = sheet.getRow(i);int columns = row.getPhysicalNumberOfCells();Field[] fields = clazz.getDeclaredFields();Object newInstance = clazz.newInstance();for (int j = 0; j < firstRowCellList.size(); j++) {String titleCellValue = firstRowCellList.get(j);/*根据行单元格名称获取带有指定注解的字段*/Field field = getCustomField(fields, titleCellValue);if (field == null) {continue;}XSSFCell cell = row.getCell(j);if (cell == null) {continue;}String cellValue = cell.toString();field.setAccessible(true);switch (field.getType().getName()) {case "java.lang.Integer":Integer num = 0;try {num = Integer.parseInt(cellValue.substring(0, cellValue.contains(".") ? cellValue.indexOf(".") : cellValue.length()));} catch (NumberFormatException e) {e.printStackTrace();}field.set(newInstance, num);break;case "java.lang.String":field.set(newInstance, cellValue);break;case "java.util.Date":field.set(newInstance, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(cellValue));break;}System.out.print(cellValue + "   ");}System.out.println();list.add((T) newInstance);}return list;}/*** 根据行单元格名称获取带有指定注解的字段** @param fields* @param cellName* @return*/private static Field getCustomField(Field[] fields, String cellName) {for (int i = 0; i < fields.length; i++) {ExcelColumn annotation = fields[i].getAnnotation(ExcelColumn.class);if (annotation != null) {if (cellName.equals(annotation.value())) {return fields[i];}}}return null;}/*** 直接将数据写到客户端** @param response* @param dataList* @param clazz* @param <T>* @throws Exception*/public static <T> void exportExcel(HttpServletResponse response, List<T> dataList, Class<T> clazz) throws Exception {Field[] fields = clazz.getDeclaredFields();Map<String, Object> filedMap = new LinkedHashMap<>();for (Field field : fields) {Class<?> type = field.getType();ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);if (annotation != null) {filedMap.put(field.getName(), annotation.value());}}XSSFWorkbook workbook = new XSSFWorkbook();//创建行String[] columnNames = filedMap.values().toArray(new String[0]);Sheet sheet = workbook.createSheet();Font titleFont = workbook.createFont();titleFont.setFontName("simsun");titleFont.setBold(true);titleFont.setColor(IndexedColors.BLACK.index);XSSFCellStyle titleStyle = workbook.createCellStyle();titleStyle.setAlignment(HorizontalAlignment.CENTER);titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);titleStyle.setFillForegroundColor(IndexedColors.YELLOW.index);titleStyle.setFont(titleFont);Row titleRow = sheet.createRow(0);for (int i = 0; i < columnNames.length; i++) {Cell cell = titleRow.createCell(i);cell.setCellValue(columnNames[i]);cell.setCellStyle(titleStyle);}//创建数据行并写入值for (T obj : dataList) {int lastRowNum = sheet.getLastRowNum();Row dataRow = sheet.createRow(lastRowNum + 1);int index = 0;for (String filedName : filedMap.keySet()) {String fieldTypeName = filedMap.get(filedName).toString();Class<?> aClass = obj.getClass();Field field = aClass.getDeclaredField(filedName);field.setAccessible(true);Object value = field.get(obj);dataRow.createCell(index++).setCellValue(value == null ? null : value.toString());}}response.setContentType("application/vnd.ms-excel");response.setHeader("content-Disposition", "attachment;filename=" + URLEncoder.encode("easyexcel.xlsx", "utf-8"));response.setHeader("Access-Control-Expose-Headers", "content-Disposition");OutputStream outputStream = response.getOutputStream();workbook.write(outputStream);outputStream.flush();outputStream.close();}}

使用方式


@Testpublic void testExcel() {List<A> list = ExcelUtil.importExcel(file, A.class);//假如传了file// 导出用js创建a标签下载ExcelUtil.exportExcel(response, list, A.class);}

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easyexcel 第一次导入导出会报错com.alibaba.excel.exception.ExcelAnalysisException，所以自定义excel导入导出表格

报错原因

自定义excel导入导出

导入pom依赖，easyexcel包含了apache.poi的依赖

自定义注解ExcelColumn 用来处理excel的导入导出：

一个model类，使用自定义注解提供表格标题信息

创建一个excel工具类

使用方式

easyexcel 第一次导入导出会报错com.alibaba.excel.exception.ExcelAnalysisException，所以自定义excel导入导出表格相关推荐

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