使用Easyexcel动态生成excel
2024-06-21 09:00:40
1. EasyExcel简介
EasyExcel是一个基于Java的简单、省内存的读写Excel的开源项目。在尽可能节约内存的情况下支持读写百M的Excel。 github地址: https://github.com/alibaba/easyexcel
2. 使用方法
添加依赖
<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>2.2.11</version></dependency>
设置excel默认样式
public static HorizontalCellStyleStrategy defaultStyles() {//TODO 默认样式//表头样式策略WriteCellStyle headWriteCellStyle = new WriteCellStyle();//设置表头居中对齐headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);//表头前景设置淡蓝色headWriteCellStyle.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());WriteFont headWriteFont = new WriteFont();headWriteFont.setBold(true);headWriteFont.setFontName("宋体");headWriteFont.setFontHeightInPoints((short) 12);headWriteCellStyle.setWriteFont(headWriteFont);//内容样式策略策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 设置背景颜色白色contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());// 设置垂直居中为居中对齐contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 设置左右对齐为靠左对齐contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);// 设置单元格上下左右边框为细边框contentWriteCellStyle.setBorderBottom(BorderStyle.MEDIUM);contentWriteCellStyle.setBorderLeft(BorderStyle.MEDIUM);contentWriteCellStyle.setBorderRight(BorderStyle.MEDIUM);contentWriteCellStyle.setBorderTop(BorderStyle.MEDIUM);//创建字体对象WriteFont contentWriteFont = new WriteFont();//内容字体大小contentWriteFont.setFontName("宋体");contentWriteFont.setFontHeightInPoints((short) 14);contentWriteCellStyle.setWriteFont(contentWriteFont);// 初始化表格样式HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);return horizontalCellStyleStrategy;}
自定义单元格样式
package com.james.easy.excel.demo.utils;import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.StyleUtil;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.metadata.style.WriteFont;
import org.apache.poi.ss.usermodel.*;import java.util.HashMap;
import java.util.List;/*** @author james* @version 1.0* @description: 设置单元格格式* @date 2021/10/16 15:46*/
public class CellColorSheetWriteHandler implements CellWriteHandler {/*** map* key：第i行* value：第i行中单元格索引集合*/private HashMap<Integer, List<Integer>> map;/*** 颜色*/private Short colorIndex;/*** 有参构造*/public CellColorSheetWriteHandler(HashMap<Integer, List<Integer>> map, Short colorIndex) {this.map = map;this.colorIndex = colorIndex;}/*** 无参构造*/public CellColorSheetWriteHandler() {}/*** 在创建单元格之前调用*/@Overridepublic void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {}/*** 在单元格创建后调用*/@Overridepublic void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {}@Overridepublic void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer integer, Boolean aBoolean) {}/*** 在单元上的所有操作完成后调用*/@Overridepublic void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {Sheet sheet = writeSheetHolder.getSheet();/*** 考虑到导出数据量过大的情况，不对每一行的每一个单元格进行样式设置，只设置必要行中的某个单元格的样式*///当前行的第i列int i = cell.getColumnIndex();//不处理第一行if (0 != cell.getRowIndex()) {List<Integer> integers = map.get(cell.getRowIndex());if (integers != null && integers.size() > 0) {if (integers.contains(i)) {// 根据单元格获取workbookWorkbook workbook = cell.getSheet().getWorkbook();//设置行高writeSheetHolder.getSheet().getRow(cell.getRowIndex()).setHeight((short) (1.4 * 256));writeSheetHolder.getSheet().setDefaultColumnWidth(200);// 单元格策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 设置背景颜色白色contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());// 设置垂直居中为居中对齐contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 设置左右对齐为靠左对齐contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);// 设置单元格上下左右边框为细边框contentWriteCellStyle.setBorderBottom(BorderStyle.MEDIUM);contentWriteCellStyle.setBorderLeft(BorderStyle.MEDIUM);contentWriteCellStyle.setBorderRight(BorderStyle.MEDIUM);contentWriteCellStyle.setBorderTop(BorderStyle.MEDIUM);// 创建字体实例WriteFont cellWriteFont = new WriteFont();// 设置字体大小cellWriteFont.setFontName("宋体");cellWriteFont.setFontHeightInPoints((short) 14);//设置字体颜色cellWriteFont.setColor(colorIndex);//单元格颜色contentWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());contentWriteCellStyle.setWriteFont(cellWriteFont);CellStyle cellStyle = StyleUtil.buildHeadCellStyle(workbook, contentWriteCellStyle);//设置当前行第i列的样式cell.getRow().getCell(i).setCellStyle(cellStyle);}}}}}设置导出列的自适应宽度
package com.james.easy.excel.demo.utils;import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.CollectionUtils;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.poi.ss.usermodel.Cell;import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** @author james* @version 1.0* @description: 导出列的自适应宽度* @date 2021/10/16 17:12*/public class CustomCellWriteHandler extends AbstractColumnWidthStyleStrategy {private static final int MAX_COLUMN_WIDTH = 255;private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap(8);public CustomCellWriteHandler() {}@Overrideprotected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);if (needSetWidth) {Map<Integer, Integer> maxColumnWidthMap = (Map)CACHE.get(writeSheetHolder.getSheetNo());if (maxColumnWidthMap == null) {maxColumnWidthMap = new HashMap(16);CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);}Integer columnWidth = this.dataLength(cellDataList, cell, isHead);if (columnWidth >= 0) {if (columnWidth > 255) {columnWidth = 255;}Integer maxColumnWidth = (Integer)((Map)maxColumnWidthMap).get(cell.getColumnIndex());if (maxColumnWidth == null || columnWidth > maxColumnWidth) {((Map)maxColumnWidthMap).put(cell.getColumnIndex(), columnWidth);writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);}}}}private Integer dataLength(List<CellData> cellDataList, Cell cell, Boolean isHead) {if (isHead) {return cell.getStringCellValue().getBytes().length;} else {CellData cellData = (CellData)cellDataList.get(0);CellDataTypeEnum type = cellData.getType();if (type == null) {return -1;} else {switch(type) {case STRING:return cellData.getStringValue().getBytes().length;case BOOLEAN:return cellData.getBooleanValue().toString().getBytes().length;case NUMBER:return cellData.getNumberValue().toString().getBytes().length;default:return -1;}}}}
}生成excel
/*** 生成excel* @param excelName excel名称* @param sheetName excel sheet名称* @param bodyList excel 主数据* @param headList excel 头标题*/public void generateExcel(String excelName, String sheetName, List<List<String>> bodyList, List<List<String>> headList) {HorizontalCellStyleStrategy horizontalCellStyleStrategy = defaultStyles();CustomCellWriteHandler handler = new CustomCellWriteHandler();//指定单元格样式//用来记录需要为第`key`行中的第`value.get(i)`列设置样式HashMap<Integer, List<Integer>> map = new HashMap<>();CellColorSheetWriteHandler writeHandler = new CellColorSheetWriteHandler(map, IndexedColors.RED.getIndex());EasyExcel.write(excelName + ".xlsx").excelType(ExcelTypeEnum.XLSX).sheet().sheetName(sheetName).head(headList).automaticMergeHead(true).registerWriteHandler(horizontalCellStyleStrategy).registerWriteHandler(writeHandler).registerWriteHandler(handler).doWrite(bodyList);}测试
public static void main(String[] args) {EasyExcelUtil util = new EasyExcelUtil();// excel 表数据List<List<String>> bodyList = new ArrayList<>();// excel 表头List<List<String>> headList = new ArrayList<>();String[] headerName = {"test1", "test2", "test3", "test4", "test5", "test6", "test7", "test8"};for (int i = 0; i < headerName.length; i++) {List<String> list = new ArrayList<>();list.add(headerName[i]);headList.add(list);}List<String> list = new ArrayList<>();List<String> list1 = new ArrayList<>();List<String> list2 = new ArrayList<>();list.add("1");list.add("2");list.add("3");list.add("4");list1.add("5");list1.add("6");list1.add("7");list1.add("8");list2.add("1");list2.add("9");list2.add("30");list2.add("40");bodyList.add(list1);bodyList.add(list);bodyList.add(list2);util.generateExcel(DateUtil.now(), "sheet", bodyList, headList);}
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