Springboot实现导入导出Excel的方法 Springboot实现导入导出Excel的方

一、添加poi的maven依赖
二、自定义注解(Excel属性标题、位置等)
三、CustomExcelUtils编写
四、定义导出实体类
五、Controller层代码编写

一、添加poi的maven依赖

org.apache.poipoi3.13org.apache.poipoi-ooxml3.13

二、自定义注解(Excel属性标题、位置等)

package com.cloud.core.annotation; import java.lang.annotation.*; /** * 自定义实体类所需要的bean(Excel属性标题、位置等) * Copyright: Copyright (C) 2021 DLANGEL, Inc. All rights reserved. * Company: 大连安琪科技有限公司 * * @author Rex * @since 2021/5/19 9:30 */@Target({ElementType.FIELD})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface ExcelColumn {/*** Excel标题** @return* @author Rex*/String value() default ""; /*** Excel从左往右排列位置，第一个是0** @return* @author Rex*/int col() default 0; }

三、CustomExcelUtils编写

package com.cloud.core.utils; import com.baomidou.mybatisplus.core.toolkit.CollectionUtils; import com.cloud.core.annotation.ExcelColumn; import com.cloud.core.common.CommonConst; import org.apache.commons.lang.BooleanUtils; import org.apache.commons.lang.CharUtils; import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.math.NumberUtils; import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.http.MediaType; import org.springframework.web.multipart.MultipartFile; import javax.servlet.http.HttpServletResponse; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.Constructor; import java.lang.reflect.Field; import java.math.BigDecimal; import java.net.URLEncoder; import java.util.*; import java.util.concurrent.atomic.AtomicInteger; import java.util.stream.Collectors; import java.util.stream.Stream; /** * 自定义导入导出Excel文件类 * Copyright: Copyright (C) 2021 DLANGEL, Inc. All rights reserved. * Company: 大连安琪科技有限公司 * * @author Rex * @since 2021/5/19 9:31 */public class CustomExcelUtils {private final static Logger log = LoggerFactory.getLogger(CustomExcelUtils.class); private final static String EXCEL2003 = "xls"; private final static String EXCEL2007 = "xlsx"; /*** 读取Excel** @param path为了测试文件用，实际为空* @param cls类* @param startRow 起始行* @param file文件* @return* @author Rex*/public static List readExcel(String path, Class cls, int startRow, MultipartFile file) {String fileName = file.getOriginalFilename(); if (!fileName.matches(CommonConst.Regex.FILE_EXT_XLS) && !fileName.matches(CommonConst.Regex.FILE_EXT_XLSX)) {log.error("上传文件格式不正确"); }List dataList = new ArrayList<>(); Workbook workbook = null; try {InputStream is = file.getInputStream(); if (fileName.endsWith(EXCEL2007)) {//FileInputStream is = new FileInputStream(new File(path)); workbook = new XSSFWorkbook(is); }if (fileName.endsWith(EXCEL2003)) {//FileInputStream is = new FileInputStream(new File(path)); workbook = new HSSFWorkbook(is); }if (workbook != null) {//类映射注解 value-->bean columnsMap> classMap = new HashMap<>(); List fields = Stream.of(cls.getDeclaredFields()).collect(Collectors.toList()); fields.forEach(field -> {ExcelColumn annotation = field.getAnnotation(ExcelColumn.class); if (annotation != null) {String value = https://www.it610.com/article/annotation.value(); if (StringUtils.isBlank(value)) {// return起到的作用和continue是相同的语法return; }if (!classMap.containsKey(value)) {classMap.put(value, new ArrayList<>()); }field.setAccessible(true); classMap.get(value).add(field); }}); //索引-->columnsMap> reflectionMap = new HashMap<>(16); //默认读取第一个sheetSheet sheet = workbook.getSheetAt(0); boolean firstRow = true; for (int i = startRow; i <= sheet.getLastRowNum(); i++) {Row row = sheet.getRow(i); // 提取注解if (firstRow) {for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {Cell cell = row.getCell(j); String cellValue = https://www.it610.com/article/getCellValue(cell); if (classMap.containsKey(cellValue)) {reflectionMap.put(j, classMap.get(cellValue)); }}if (reflectionMap.size()> 0) {firstRow = false; }} else {//忽略空白行if (row == null) {continue; }try {T t = cls.newInstance(); //判断是否为空白行boolean allBlank = true; for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {if (reflectionMap.containsKey(j)) {Cell cell = row.getCell(j); String cellValue = https://www.it610.com/article/getCellValue(cell); if (StringUtils.isNotBlank(cellValue)) {allBlank = false; }List fieldList = reflectionMap.get(j); fieldList.forEach(x -> {try {handleField(t, cellValue, x); } catch (Exception e) {log.error(String.format("reflect field:%s value:%s exception!", x.getName(), cellValue), e); }}); }}if (!allBlank) {dataList.add(t); } else {log.warn(String.format("row:%s is blank ignore!", i)); }} catch (Exception e) {log.error(String.format("parse row:%s exception!", i), e); }}}}} catch (Exception e) {log.error(String.format("parse excel exception!"), e); } finally {if (workbook != null) {try {workbook.close(); } catch (Exception e) {log.error(String.format("parse excel exception!"), e); }}}return dataList; }private static void handleField(T t, String value, Field field) throws Exception {Class type = field.getType(); if (type == null || type == void.class || StringUtils.isBlank(value)) {return; }if (type == Object.class) {field.set(t, value); //数字类型} else if (type.getSuperclass() == null || type.getSuperclass() == Number.class) {if (type == int.class || type == Integer.class) {field.set(t, NumberUtils.toInt(value)); } else if (type == long.class || type == Long.class) {field.set(t, NumberUtils.toLong(value)); } else if (type == byte.class || type == Byte.class) {field.set(t, NumberUtils.toByte(value)); } else if (type == short.class || type == Short.class) {field.set(t, NumberUtils.toShort(value)); } else if (type == double.class || type == Double.class) {field.set(t, NumberUtils.toDouble(value)); } else if (type == float.class || type == Float.class) {field.set(t, NumberUtils.toFloat(value)); } else if (type == char.class || type == Character.class) {field.set(t, CharUtils.toChar(value)); } else if (type == boolean.class) {field.set(t, BooleanUtils.toBoolean(value)); } else if (type == BigDecimal.class) {field.set(t, new BigDecimal(value)); }} else if (type == Boolean.class) {field.set(t, BooleanUtils.toBoolean(value)); } else if (type == Date.class) {//field.set(t, value); } else if (type == String.class) {field.set(t, value); } else {Constructor constructor = type.getConstructor(String.class); field.set(t, constructor.newInstance(value)); }}private static String getCellValue(Cell cell) {if (cell == null) {return ""; }if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {if (HSSFDateUtil.isCellDateFormatted(cell)) {return HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString(); } else {return new BigDecimal(cell.getNumericCellValue()).toString(); }} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {return StringUtils.trimToEmpty(cell.getStringCellValue()); } else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {return StringUtils.trimToEmpty(cell.getCellFormula()); } else if (cell.getCellType() == Cell.CELL_TYPE_BLANK) {return ""; } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {return String.valueOf(cell.getBooleanCellValue()); } else if (cell.getCellType() == Cell.CELL_TYPE_ERROR) {return "ERROR"; } else {return cell.toString().trim(); }}public static void writeExcel(HttpServletResponse response, List dataList, Class cls) {Field[] fields = cls.getDeclaredFields(); List fieldList = Arrays.stream(fields).filter(field -> {ExcelColumn annotation = field.getAnnotation(ExcelColumn.class); if (annotation != null && annotation.col() > 0) {field.setAccessible(true); return true; }return false; }).sorted(Comparator.comparing(field -> {int col = 0; ExcelColumn annotation = field.getAnnotation(ExcelColumn.class); if (annotation != null) {col = annotation.col(); }return col; })).collect(Collectors.toList()); Workbook wb = new XSSFWorkbook(); Sheet sheet = wb.createSheet("Sheet1"); AtomicInteger ai = new AtomicInteger(); {Row row = sheet.createRow(ai.getAndIncrement()); AtomicInteger aj = new AtomicInteger(); //写入头部fieldList.forEach(field -> {ExcelColumn annotation = field.getAnnotation(ExcelColumn.class); String columnName = ""; if (annotation != null) {columnName = annotation.value(); }Cell cell = row.createCell(aj.getAndIncrement()); CellStyle cellStyle = wb.createCellStyle(); cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex()); cellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND); cellStyle.setAlignment(CellStyle.ALIGN_CENTER); Font font = wb.createFont(); font.setBoldweight(Font.BOLDWEIGHT_NORMAL); cellStyle.setFont(font); cell.setCellStyle(cellStyle); cell.setCellValue(columnName); }); }if (CollectionUtils.isNotEmpty(dataList)) {dataList.forEach(t -> {Row row1 = sheet.createRow(ai.getAndIncrement()); AtomicInteger aj = new AtomicInteger(); fieldList.forEach(field -> {Class type = field.getType(); Object valuehttps://www.it610.com/article/= ""; try {value = https://www.it610.com/article/field.get(t); } catch (Exception e) {e.printStackTrace(); }Cell cell = row1.createCell(aj.getAndIncrement()); if (value != null) {if (type == Date.class) {cell.setCellValue(value.toString()); } else {cell.setCellValue(value.toString()); }cell.setCellValue(value.toString()); }}); }); }//冻结窗格wb.getSheet("Sheet1").createFreezePane(0, 1, 0, 1); //浏览器下载excelbuildExcelDocument("导出数据.xlsx", wb, response); //生成excel文件//buildExcelFile(".\\default.xlsx", wb); }/*** 浏览器下载excel** @param fileName* @param wb* @param response*/private static void buildExcelDocument(String fileName, Workbook wb, HttpServletResponse response) {try {response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE); response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "utf-8")); response.flushBuffer(); wb.write(response.getOutputStream()); } catch (IOException e) {e.printStackTrace(); }}/*** 生成excel文件** @param path 生成excel路径* @param wb*/private static void buildExcelFile(String path, Workbook wb) {File file = new File(path); if (file.exists()) {file.delete(); }try {wb.write(new FileOutputStream(file)); } catch (Exception e) {e.printStackTrace(); }}}

四、定义导出实体类主要是使用这里的@ExcelColumn注解，其中的col从0开始的。

package com.cloud.library.model.role; import com.cloud.core.annotation.ExcelColumn; import lombok.Data; /** * 导入角色用 * Copyright: Copyright (C) 2021 DLANGEL, Inc. All rights reserved. * Company: 大连安琪科技有限公司 * * @author Rex * @since 2021/5/19 16:13 */@Datapublic class SysRoleExcel {@ExcelColumn(valuehttps://www.it610.com/article/= "姓名", col = 1)private String name; @ExcelColumn(valuehttps://www.it610.com/article/= "描述", col = 2)private String description; }

Excel对应的模板参考

文章图片

五、Controller层代码编写

//region 导入数据/*** 导入数据** @param file* @return* @author Rex*/@RequestMapping(valuehttps://www.it610.com/article/= "/readExcel", method = RequestMethod.POST)public void readExcel(@RequestParam(valuehttps://www.it610.com/article/= "uploadFile", required = false) MultipartFile file) {List list = CustomExcelUtils.readExcel("", SysRoleExcel.class, 0, file); List sysRoleList = new ArrayList<>(); list.forEach(e -> {SysRole sysRole = new SysRole(); BeanUtils.copyProperties(e, sysRole); sysRoleList.add(sysRole); }); sysRoleService.saveBatch(sysRoleList); }// endregion

这里发现了，这个saveBatch可以直接使用雪花的id来保存数据，因为这里用的是mybatis-plus，单条数据保存使用的是它的配置。然后试了下，批量导入也是可以的，另外，这个批量保存，理论上没有条数限制，这个还等待后续测试。
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