Easy-excel操作Excel 待修改

1. EasyExcel 简介EasyExcel 是一个基于 Java 的简单、省内存的读写 Excel 工具。在处理大数据量的 Excel 文件时它具有占用内存少、性能高的特点并且使用简单通过注解和少量的代码就能完成 Excel 文件的读写操作。2. EasyExcel 简单语法及使用2.1 添加依赖如果使用 Maven 项目在pom.xml中添加以下依赖dependencygroupIdcom.alibaba/groupIdartifactIdeasyexcel/artifactIdversion3.1.1/version/dependency2.2 写 Excel 示例定义 Excel 数据实体类importcom.alibaba.excel.annotation.ExcelProperty;publicclassDemoData{ExcelProperty(订单编号)privateStringorderNo;ExcelProperty(销售金额)privateDoublesalesAmount;// 构造函数、getter 和 setter 方法publicDemoData(StringorderNo,DoublesalesAmount){this.orderNoorderNo;this.salesAmountsalesAmount;}publicStringgetOrderNo(){returnorderNo;}publicvoidsetOrderNo(StringorderNo){this.orderNoorderNo;}publicDoublegetSalesAmount(){returnsalesAmount;}publicvoidsetSalesAmount(DoublesalesAmount){this.salesAmountsalesAmount;}}写入 Excel 文件importcom.alibaba.excel.EasyExcel;importjava.util.ArrayList;importjava.util.List;publicclassWriteExcelExample{publicstaticvoidmain(String[]args){StringfileNamesales_report.xlsx;ListDemoDatadataListnewArrayList();dataList.add(newDemoData(001,1000.0));dataList.add(newDemoData(002,2000.0));EasyExcel.write(fileName,DemoData.class).sheet(销售报表).doWrite(dataList);}}2.3 读 Excel 示例定义监听器类importcom.alibaba.excel.context.AnalysisContext;importcom.alibaba.excel.event.AnalysisEventListener;importjava.util.ArrayList;importjava.util.List;publicclassDemoDataListenerextendsAnalysisEventListenerDemoData{privateListDemoDatadataListnewArrayList();Overridepublicvoidinvoke(DemoDatadata,AnalysisContextcontext){dataList.add(data);}OverridepublicvoiddoAfterAllAnalysed(AnalysisContextcontext){// 数据解析完成后的操作System.out.println(数据解析完成共 dataList.size() 条记录);}publicListDemoDatagetDataList(){returndataList;}}读取 Excel 文件importcom.alibaba.excel.EasyExcel;publicclassReadExcelExample{publicstaticvoidmain(String[]args){StringfileNamesales_report.xlsx;DemoDataListenerlistenernewDemoDataListener();EasyExcel.read(fileName,DemoData.class,listener).sheet().doRead();System.out.println(listener.getDataList());}}3. 从数据库中取数形成电商销售资金报表示例3.1 数据库连接和数据查询假设使用 MySQL 数据库使用 JDBC 进行数据查询importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.ResultSet;importjava.sql.Statement;importjava.util.ArrayList;importjava.util.List;publicclassDatabaseUtils{privatestaticfinalStringURLjdbc:mysql://localhost:3306/ecommerce;privatestaticfinalStringUSERroot;privatestaticfinalStringPASSWORDpassword;publicstaticListDemoDataquerySalesData(){ListDemoDatadataListnewArrayList();try(ConnectionconnDriverManager.getConnection(URL,USER,PASSWORD);Statementstmtconn.createStatement();ResultSetrsstmt.executeQuery(SELECT order_no, sales_amount FROM sales_orders)){while(rs.next()){StringorderNors.getString(order_no);doublesalesAmountrs.getDouble(sales_amount);dataList.add(newDemoData(orderNo,salesAmount));}}catch(Exceptione){e.printStackTrace();}returndataList;}}3.2 生成电商销售资金报表一个 sheet 带有多个报表importcom.alibaba.excel.EasyExcel;importcom.alibaba.excel.write.metadata.WriteSheet;importjava.util.List;publicclassEcommerceSalesReportGenerator{publicstaticvoidmain(String[]args){StringfileNameecommerce_sales_report.xlsx;// 从数据库中查询数据ListDemoDatasalesDataDatabaseUtils.querySalesData();// 创建 Excel 写入对象varexcelWriterEasyExcel.write(fileName).build();// 创建 sheetWriteSheetwriteSheetEasyExcel.writerSheet(销售资金报表).build();// 第一个报表销售订单报表excelWriter.write(salesData,writeSheet);// 模拟第二个报表数据这里简单重复使用 salesData实际可根据需求查询不同数据excelWriter.write(salesData,writeSheet);// 关闭写入器excelWriter.finish();}}4. 报表格式设置如果需要设置报表格式如表头样式、数据样式等可以使用 EasyExcel 提供的样式设置功能。以下是一个简单的表头样式设置示例importcom.alibaba.excel.EasyExcel;importcom.alibaba.excel.write.metadata.WriteSheet;importcom.alibaba.excel.write.metadata.style.WriteCellStyle;importcom.alibaba.excel.write.metadata.style.WriteFont;importcom.alibaba.excel.write.style.HorizontalCellStyleStrategy;importorg.apache.poi.ss.usermodel.HorizontalAlignment;importjava.util.List;publicclassFormattedReportGenerator{publicstaticvoidmain(String[]args){StringfileNameformatted_report.xlsx;ListDemoDatasalesDataDatabaseUtils.querySalesData();// 表头样式WriteCellStyleheadWriteCellStylenewWriteCellStyle();WriteFontheadWriteFontnewWriteFont();headWriteFont.setFontHeightInPoints((short)12);headWriteCellStyle.setWriteFont(headWriteFont);headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 内容样式WriteCellStylecontentWriteCellStylenewWriteCellStyle();contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 样式策略HorizontalCellStyleStrategyhorizontalCellStyleStrategynewHorizontalCellStyleStrategy(headWriteCellStyle,contentWriteCellStyle);// 创建 Excel 写入对象并应用样式策略varexcelWriterEasyExcel.write(fileName,DemoData.class).registerWriteHandler(horizontalCellStyleStrategy).build();WriteSheetwriteSheetEasyExcel.writerSheet(销售资金报表).build();excelWriter.write(salesData,writeSheet);excelWriter.finish();}}5、代码实现可视化调整样式1. 基本样式设置在 EasyExcel 里能够运用WriteCellStyle和WriteFont类来设置单元格的样式像字体、颜色、对齐方式等。以下是一个完整示例展示如何设置表头和内容的样式importcom.alibaba.excel.EasyExcel;importcom.alibaba.excel.write.metadata.WriteSheet;importcom.alibaba.excel.write.metadata.style.WriteCellStyle;importcom.alibaba.excel.write.metadata.style.WriteFont;importcom.alibaba.excel.write.style.HorizontalCellStyleStrategy;importorg.apache.poi.ss.usermodel.*;importjava.util.ArrayList;importjava.util.List;// 定义 Excel 数据实体类classDemoData{com.alibaba.excel.annotation.ExcelProperty(订单编号)privateStringorderNo;com.alibaba.excel.annotation.ExcelProperty(销售金额)privateDoublesalesAmount;publicDemoData(StringorderNo,DoublesalesAmount){this.orderNoorderNo;this.salesAmountsalesAmount;}publicStringgetOrderNo(){returnorderNo;}publicvoidsetOrderNo(StringorderNo){this.orderNoorderNo;}publicDoublegetSalesAmount(){returnsalesAmount;}publicvoidsetSalesAmount(DoublesalesAmount){this.salesAmountsalesAmount;}}publicclassExcelStyleExample{publicstaticvoidmain(String[]args){StringfileNamestyled_report.xlsx;ListDemoDatadataListnewArrayList();dataList.add(newDemoData(001,1000.0));dataList.add(newDemoData(002,2000.0));// 表头样式WriteCellStyleheadWriteCellStylenewWriteCellStyle();WriteFontheadWriteFontnewWriteFont();headWriteFont.setFontHeightInPoints((short)14);// 设置表头字体大小headWriteFont.setBold(true);// 表头字体加粗headWriteCellStyle.setWriteFont(headWriteFont);headWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());// 设置表头背景颜色headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 表头内容居中对齐// 内容样式WriteCellStylecontentWriteCellStylenewWriteCellStyle();WriteFontcontentWriteFontnewWriteFont();contentWriteFont.setFontHeightInPoints((short)12);// 设置内容字体大小contentWriteCellStyle.setWriteFont(contentWriteFont);contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 内容居中对齐contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 内容垂直居中对齐contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);// 设置底部边框contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);// 设置左边框contentWriteCellStyle.setBorderRight(BorderStyle.THIN);// 设置右边框contentWriteCellStyle.setBorderTop(BorderStyle.THIN);// 设置顶部边框// 样式策略HorizontalCellStyleStrategyhorizontalCellStyleStrategynewHorizontalCellStyleStrategy(headWriteCellStyle,contentWriteCellStyle);// 写入 Excel 文件并应用样式策略EasyExcel.write(fileName,DemoData.class).registerWriteHandler(horizontalCellStyleStrategy).sheet(销售报表).doWrite(dataList);}}2. 自定义样式处理器要是有更复杂的样式需求还能自定义样式处理器。下面是一个自定义样式处理器的示例它会依据数据内容来设置不同的样式importcom.alibaba.excel.EasyExcel;importcom.alibaba.excel.write.handler.CellWriteHandler;importcom.alibaba.excel.write.metadata.holder.WriteSheetHolder;importcom.alibaba.excel.write.metadata.holder.WriteTableHolder;importcom.alibaba.excel.write.metadata.style.WriteCellStyle;importcom.alibaba.excel.write.metadata.style.WriteFont;importorg.apache.poi.ss.usermodel.*;importjava.util.ArrayList;importjava.util.List;classCustomCellStyleHandlerimplementsCellWriteHandler{OverridepublicvoidafterCellDispose(WriteSheetHolderwriteSheetHolder,WriteTableHolderwriteTableHolder,ListCellDatacellDataList,Cellcell,Headhead,IntegerrelativeRowIndex,BooleanisHead){if(!isHead){WriteCellStylestylenewWriteCellStyle();WriteFontfontnewWriteFont();if(cell.getColumnIndex()1){// 假设第二列是销售金额列doubleamountDouble.parseDouble(cell.getStringCellValue());if(amount1500){font.setColor(IndexedColors.RED.getIndex());// 销售金额大于 1500 显示红色字体}}style.setWriteFont(font);CellStylecellStylewriteSheetHolder.getSheet().getWorkbook().createCellStyle();cellStyle.cloneStyleFrom(style.build());cell.setCellStyle(cellStyle);}}}publicclassCustomStyleExample{publicstaticvoidmain(String[]args){StringfileNamecustom_styled_report.xlsx;ListDemoDatadataListnewArrayList();dataList.add(newDemoData(001,1000.0));dataList.add(newDemoData(002,2000.0));EasyExcel.write(fileName,DemoData.class).registerWriteHandler(newCustomCellStyleHandler()).sheet(销售报表).doWrite(dataList);}}借助工具进行可视化调整在生成 Excel 文件之后你可以使用 Excel 软件如 Microsoft Excel 或 WPS 表格打开文件然后通过软件的界面来可视化地调整样式具体操作步骤如下打开文件用 Excel 软件打开 EasyExcel 生成的文件。选择单元格或区域选中你想要调整样式的单元格或者单元格区域。调整样式利用 Excel 软件提供的功能来调整样式例如字体设置在“开始”菜单中选择字体、字号、颜色、加粗、倾斜等。对齐方式通过“对齐方式”组设置水平对齐和垂直对齐方式。边框和底纹使用“边框”和“填充颜色”按钮来设置单元格的边框和背景颜色。数据格式在“数字”组中选择合适的数据格式如货币、百分比等。