EasyExcel生成三线表，并转为png格式图片

要做生成Excel然后再生成图片的任务，做成三线表的形式，但阅读了官方demo代码发现通过注解无法处理好最后一行下框线（已有策略都是按列设定或根据表头表体设定，没有逐行设定格式的），需要自己实现针对每一行的策略。

三线表格式：

表头上下边框为实线；表体除最后一行的数据上下边框均为None，最后一行上边框设为None，下边框实线。关键就是处理好表体替他行和最后一行的格式。

白色背景三线表

import com.alibaba.excel.EasyExcel;
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;import java.util.ArrayList;
import java.util.List;    public String ThreeLineWrite(List<ChartItem> data) {//路径可根据实际修改String fileName = "F://1.xlsx";//表头样式WriteCellStyle headWriteCellStyle = new WriteCellStyle(); //只要上下边框，左右边框为NoneheadWriteCellStyle.setBorderTop(BorderStyle.MEDIUM);headWriteCellStyle.setBorderBottom(BorderStyle.MEDIUM);headWriteCellStyle.setBorderLeft(BorderStyle.NONE);headWriteCellStyle.setBorderRight(BorderStyle.NONE);headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());//字体WriteFont headWriteFont = new WriteFont();headWriteFont.setFontHeightInPoints((short)26);//设置字体大小headWriteFont.setBold(false);  headWriteCellStyle.setWriteFont(headWriteFont);//除最后一行以外的表体样式WriteCellStyle bodyStyle = new WriteCellStyle();bodyStyle.setVerticalAlignment(VerticalAlignment.CENTER);bodyStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);WriteFont bodyWriteFont = new WriteFont();bodyWriteFont.setFontHeightInPoints((short)30);bodyStyle.setWriteFont(bodyWriteFont);// 设置边框bodyStyle.setBorderTop(BorderStyle.NONE);bodyStyle.setBorderLeft(BorderStyle.NONE);bodyStyle.setBorderRight(BorderStyle.NONE);bodyStyle.setBorderBottom(BorderStyle.NONE);//最后一行WriteCellStyle lastRow = new WriteCellStyle();//最后一行边框lastRow.setBorderBottom(BorderStyle.MEDIUM);lastRow.setBorderTop(BorderStyle.NONE);lastRow.setBorderLeft(BorderStyle.NONE);lastRow.setBorderRight(BorderStyle.NONE);//字体lastRow.setWriteFont(bodyWriteFont);lastRow.setHorizontalAlignment(HorizontalAlignment.CENTER);lastRow.setVerticalAlignment(VerticalAlignment.CENTER);//整合表体样式List<WriteCellStyle> preList = new ArrayList<>();//除最后一行以外的样式放入容器for (int i = 0; i <data.size()-1; i++) {preList.add(bodyStyle);}//最后一行的样式放入容器preList.add(lastRow);//根据表头表体策略生成一个整体的策略HorizontalCellStyleStrategy dataTableStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, preList);//这里就是照搬demo的代码了EasyExcel.write(fileName, ChartItem.class).registerWriteHandler(dataTableStrategy).sheet("模板").doWrite(() -> {// 分页查询数据return data;});return fileName;}

其中，实体类和data的定义：

package com.alibaba.easyexcel.test.demo.write;import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.*;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter;@Getter
@Setter
@EqualsAndHashCode@ContentRowHeight(60)
@HeadRowHeight(60)
@ColumnWidth(30)public class ChartItem {@ColumnWidth(50)@ExcelProperty("名称")public String name;@ExcelProperty("交易时间")public String TradeTime;@ExcelProperty("持仓时长")public  String HoldingDuration;@ExcelProperty("期望换手率")public String ExpectChangeRate;@ExcelProperty("买完成率")public String BuyCompleteRate;@ExcelProperty("卖完成率")public String SellCompleteRate;@ColumnWidth(45)@ExcelProperty("未完成股票前三支")public String TheFirstThreeUnComplete;/*** 忽略这个字段*/@ExcelIgnoreprivate String ignore;
}

    //生成数据(测试用)public List<ChartItem> data() {List<ChartItem> list = ListUtils.newArrayList();for (int i = 0; i < 7; i++) {ChartItem data = new ChartItem();data.setName("字符串");data.setBuyCompleteRate("1");data.setSellCompleteRate("1");data.setTradeTime("1");data.setHoldingDuration("1");data.setExpectChangeRate("1");data.setTheFirstThreeUnComplete("1");list.add(data);}return list;}

在filename路径下可以看到xlsx文件，转为图片后效果如图

交错背景底纹三线表，并自定义背景色

public static final String DEFAULT_BACKGROUND_COLOR = "#f0f2f5";
public String ThreeLineWrite(List<ChartItem> data) {// 自定义背景色int r = Integer.parseInt((DEFAULT_BACKGROUND_COLOR.substring(1,3)),16);int g = Integer.parseInt((DEFAULT_BACKGROUND_COLOR.substring(3,5)),16);int b = Integer.parseInt((DEFAULT_BACKGROUND_COLOR.substring(5,7)),16);HSSFWorkbook wb = new HSSFWorkbook();HSSFPalette palette = wb.getCustomPalette();HSSFColor hssfColor = palette.findSimilarColor(r, g, b);String fileName = "F://1.xlsx";//表头样式WriteCellStyle headWriteCellStyle = new WriteCellStyle();WriteFont bodyWriteFont = new WriteFont();WriteFont headWriteFont = new WriteFont();headWriteFont.setFontHeightInPoints((short)26);//设置字体大小headWriteFont.setBold(false);headWriteFont.setColor(IndexedColors.GREY_80_PERCENT.getIndex());bodyWriteFont.setColor(IndexedColors.GREY_80_PERCENT.getIndex());bodyWriteFont.setFontHeightInPoints((short)30);headWriteCellStyle.setWriteFont(headWriteFont);headWriteCellStyle.setBorderTop(BorderStyle.MEDIUM);headWriteCellStyle.setBorderBottom(BorderStyle.MEDIUM);headWriteCellStyle.setBorderLeft(BorderStyle.NONE);headWriteCellStyle.setBorderRight(BorderStyle.NONE);headWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());//除最后一行以外的表体样式WriteCellStyle bodyStyle = new WriteCellStyle();bodyStyle.setWriteFont(bodyWriteFont);bodyStyle.setVerticalAlignment(VerticalAlignment.CENTER);bodyStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 设置边框bodyStyle.setBorderTop(BorderStyle.NONE);bodyStyle.setBorderLeft(BorderStyle.NONE);bodyStyle.setBorderRight(BorderStyle.NONE);bodyStyle.setBorderBottom(BorderStyle.NONE);//除最后一行以外的表体样式WriteCellStyle oddbodyStyle = new WriteCellStyle();oddbodyStyle.setWriteFont(bodyWriteFont);oddbodyStyle.setVerticalAlignment(VerticalAlignment.CENTER);oddbodyStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 设置边框oddbodyStyle.setBorderTop(BorderStyle.NONE);oddbodyStyle.setBorderLeft(BorderStyle.NONE);oddbodyStyle.setBorderRight(BorderStyle.NONE);oddbodyStyle.setBorderBottom(BorderStyle.NONE);oddbodyStyle.setFillForegroundColor(hssfColor.getIndex());oddbodyStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);//最后一行WriteCellStyle lastRow = new WriteCellStyle();//最后一行边框lastRow.setBorderBottom(BorderStyle.MEDIUM);lastRow.setBorderTop(BorderStyle.NONE);lastRow.setBorderLeft(BorderStyle.NONE);lastRow.setBorderRight(BorderStyle.NONE);//字体lastRow.setWriteFont(bodyWriteFont);//居中对齐lastRow.setHorizontalAlignment(HorizontalAlignment.CENTER);lastRow.setVerticalAlignment(VerticalAlignment.CENTER);//最后一行WriteCellStyle oddlastRow = new WriteCellStyle();oddlastRow.setFillForegroundColor(hssfColor.getIndex());//最后一行边框oddlastRow.setBorderBottom(BorderStyle.MEDIUM);oddlastRow.setBorderTop(BorderStyle.NONE);oddlastRow.setBorderLeft(BorderStyle.NONE);oddlastRow.setBorderRight(BorderStyle.NONE);oddlastRow.setFillPatternType(FillPatternType.SOLID_FOREGROUND);//字体oddlastRow.setWriteFont(bodyWriteFont);//居中对齐oddlastRow.setHorizontalAlignment(HorizontalAlignment.CENTER);oddlastRow.setVerticalAlignment(VerticalAlignment.CENTER);//整合表体样式List<WriteCellStyle> preList = new ArrayList<>();int i;for (i = 0; i <data.size()-1; i++) {preList.add(i%2==0?oddbodyStyle:bodyStyle);}preList.add(i%2==0?oddlastRow:lastRow);HorizontalCellStyleStrategy dataTableStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, preList);EasyExcel.write(fileName, ChartItem.class).registerWriteHandler(dataTableStrategy).sheet("模板").doWrite(() -> {// 分页查询数据return data;});return fileName;}

效果图如下

灰色略深了些，可以调个色或者将自定义颜色改成rgba格式改进。

Excel转png格式，需要导一个spire的jar包。

import com.spire.xls.*;
public void exceltostream (String path) throws FileNotFoundException {Workbook wb = new Workbook();wb.loadFromFile(path);//获取工作表Worksheet sheet = wb.getWorksheets().get(0);//调用方法将Excel工作表保存为图片sheet.saveToImage("E://ToImg1.png");}

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