EasyExcel导入导出样式、自适应列宽、自适应行高

一、先加依赖

        <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.1.1</version></dependency>

二、话不多说，直接先看导出样式设置，可以根据自己实际情况调整：

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);}
}

三、自适应列宽

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;}}}}
}

四、自适应行高

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、导出

先创建导出实体类

import com.alibaba.excel.annotation.ExcelIgnoreUnannotated;
import com.alibaba.excel.annotation.ExcelProperty;
import com.terton.aisp.ssp.entity.Feedback;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@AllArgsConstructor
@NoArgsConstructor
@ExcelIgnoreUnannotated // 只导出带有ExcelProperty注解的字段
public class ExcelFeedbackVO extends Feedback {/*** 站点ID*/// 设置表头名称 ，索引最好带上，不会出问题。@ExcelProperty(value = "站点id", index = 0)private String siteId;/*** 搜索内容*/@ExcelProperty(value = "搜索内容", index = 1)private String title;/*** 反馈内容*/@ExcelProperty(value = "反馈内容", index = 2)private String content;/*** IP地址*/@ExcelProperty(value = "搜索IP", index = 3)private String ip;}

2、创建一个对外暴露的接口。

@PostMapping("/downloadBack")
public void downloadBack(HttpServletResponse response, String siteId, Integer content) throws TException, IOException {List<Feedback> list = feedbackService.searchBack(siteId, content);setResponse(response, "列表");EasyExcel.write(response.getOutputStream(), ExcelFeedbackVO.class /* 引用需要导出的字段*/).sheet("列表").registerWriteHandler(new CustomCellWriteWidthConfig()) /*自适应列宽*/.registerWriteHandler(new CustomCellWriteHeighConfig()) /*自适应行高（根据自己情况选择使用，我这里没用到）*/.registerWriteHandler(EasyExcelUtils.getStyleStrategy()) /*引用样式*/.doWrite(list); /* 想到导出模板的话，此处给一个空的集合就好*/}

3、设置响应体信息（由于我这个项目导入导出比较多，把此方法变成公共方法）

import javax.servlet.http.HttpServletResponse;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;public class SetResponse {/*** 导出设置响应信息** @param response 响应*/public static void setResponse(HttpServletResponse response,String fileName) {// 文件名String sheetName = URLEncoder.encode(fileName, StandardCharsets.UTF_8) + ".xlsx";// contentType 响应内容的类型response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");// 设置字符response.setCharacterEncoding("utf-8");// 设置文件名response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + sheetName);}}

4、访问接口

模板

正常导出

六、导入

1、监听器（关键）

注意事项：监听器里面不能使用注入的形式将service注入进来，所以可以使用构造器

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.terton.aisp.common.enums.ExcelNameModelEnum;
import com.terton.aisp.common.util.PingYinUtil;
import com.terton.aisp.word.entity.MassWord;
import com.terton.aisp.word.enums.UploadBatchCountEnum;
import com.terton.aisp.word.service.IMassWordService;
import com.terton.aisp.word.service.impl.MassWordServiceImpl;
import com.terton.aisp.word.vo.ExcelMassWordModelVO;
import com.terton.framework.util.StringUtil;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.CollectionUtils;import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;@Slf4j
@AllArgsConstructor
@NoArgsConstructor
public class UploadMassWordListener extends AnalysisEventListener<ExcelMassWordModelVO> {private IMassWordService massWordService;private String siteId;private Integer wordLevel;private String userName;private List<ExcelMassWordModelVO> list = new ArrayList<>();private List<String> massWordList = new ArrayList<>();private List<String> massWords = new ArrayList<>();private Integer successNum = 0;private Integer errorNum = 0;/*** 表头校验 此方法里面可进行对导入的excel的格式进行判断，先执行*/@Overridepublic void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {// headMap 表头数据，拿出进行判断就好}/*** 每读一行触发一次 ** @param modelVO         ”* @param analysisContext “*/@Overridepublic void invoke(ExcelMassWordModelVO modelVO, AnalysisContext analysisContext) {log.info("读取到一条数据：{}",modelVO)// 可以对数据进行判断是否有效。 根据自己的实际业务逻辑判断，// 判断完成的数据可以用一个List来接收// 为了防止数据过多，数据一直存在内存中，这里可以设置一个阈值，当list中的数据超过这个值，就先把这批数据添加到数据库。if (StringUtil.notBlankAndNull(modelVO.getMassWord()) && StringUtil.notBlankAndNull(modelVO.getTargetWord())) {if (!CollectionUtils.isEmpty(massWords) && massWords.contains(modelVO.getMassWord())) {throw new RuntimeException(ExcelNameModelEnum.FailImport.RESULT_FIELD.getText() + modelVO.getMassWord());}massWords.add(modelVO.getMassWord());massWordList.add(modelVO.getMassWord());list.add(modelVO);try {if (list.size() >= UploadBatchCountEnum.MASS_WORD.getCount() /*我这里阈值设置的是500*/) {save();}} catch (Exception e) {throw new RuntimeException(e.getMessage());}}}/*** 完毕触发** @param analysisContext ”*/@Overridepublic void doAfterAllAnalysed(AnalysisContext analysisContext) {// 写数据库if (!CollectionUtils.isEmpty(list)) {save();}massWords.clear();log.info("成功写入数量:{}", successNum);log.info("失败写入数量:{}", errorNum);successNum = 0;errorNum = 0;}private void save() {try {List<MassWord> recordList = massWordService.getByMasswordsAndSiteId(massWordList, siteId);if (!CollectionUtils.isEmpty(recordList)) {List<String> collect = recordList.stream().map(MassWord::getMassWord).collect(Collectors.toList());if (!CollectionUtils.isEmpty(collect)) {throw new RuntimeException(ExcelNameModelEnum.FailImport.RESULT_FIELD.getText() + collect);}}for (ExcelMassWordModelVO wordModelVO : list) {MassWord newMassWord = getMassWord(wordModelVO);massWordService.save(newMassWord);successNum += 1;}} catch (Exception e) {errorNum += 1;throw new RuntimeException(e.getMessage());}massWordList.clear();list.clear();}private MassWord getMassWord(ExcelMassWordModelVO wordModelVO) {MassWord massWord = new MassWord();massWord.setMassWord(wordModelVO.getMassWord());massWord.setTargetWord(wordModelVO.getTargetWord());massWord.setWordLevel(wordLevel);massWord.setSiteId(siteId);massWord.setAcronym(PingYinUtil.getFirstSpell(wordModelVO.getMassWord()));massWord.setFullPinYin(PingYinUtil.getFullSpell(wordModelVO.getMassWord()));massWord.setCrTime(new Date());massWord.setCrUser(userName);return massWord;}public UploadMassWordListener(MassWordServiceImpl massWordService, String siteId,Integer wordLevel, String userName) {this.massWordService = massWordService;this.siteId = siteId;this.wordLevel = wordLevel;this.userName = userName;}}

2、导入与监听器的使用。

    public void upload(MultipartFile file, String siteId, Integer wordLevel,String userName) throws IOException {UploadMassWordListener listener = new UploadMassWordListener(this, siteId, wordLevel, userName);EasyExcel.read(file.getInputStream(), ExcelMassWordModelVO.class, listener).sheet(0).headRowNumber(1).doRead();}

到这里大概就结束了，希望对你有用。

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