easyExcel自定义导出，指定列，设置请求头背景色，加入合计行，设置合计行字体，背景色等等

效果图

1.引入easyExcel pom

        
			com.alibaba
			easyexcel
			3.3.1
		

2.工具类-自定义样式handler-CustomCellWriteHandler

import java.util.HashMap;

import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;

import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.util.BooleanUtils;
import com.alibaba.excel.write.handler.AbstractCellWriteHandler;
import com.alibaba.excel.write.handler.context.CellWriteHandlerContext;
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 com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
/**
 * easyexcel自定义行列样式
 * 表头背景色，合计行背景色-字体颜色，
 * @author cf
 *
 * @date 2023-11-28 11:18:23
 */
public class CustomCellWriteHandler extends AbstractCellWriteHandler {

	// 字体颜色
	private Short colorIndex;
	// 背景颜色
	private Short bgColorIndex;
	// 行，以及对应的列，多个列逗号拼接,全列，-1
	private HashMap rowColMap;

	/**
	 * 
	 * @param bgColorIndex -1 不设置
	 * @param colorIndex   -1 不设置
	 * @param rowColMap    value = -1,整行
	 */
	public CustomCellWriteHandler(Short bgColorIndex, Short colorIndex, HashMap rowColMap) {
		this.colorIndex = colorIndex;
		this.bgColorIndex = bgColorIndex;
		this.rowColMap = rowColMap;
	}

	@Override
	public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row,
			Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
		// 设置行高
		int rowIndex = row.getRowNum();
		System.out.println("当前行: " + rowIndex);
		short height = 600;
		row.setHeight(height);
	}

	@Override
	public void afterCellDispose(CellWriteHandlerContext context) {
		Cell cell = context.getCell();
		int rowIndex = cell.getRowIndex();
		int cellIndex = cell.getColumnIndex();

		// 自定义宽度处理

		// 自定义样式处理
		// 当前事件会在 数据设置到poi的cell里面才会回调
		// 判断不是头的情况 如果是fill 的情况 这里会==null 所以用not true
		Boolean head = context.getHead();
		if (BooleanUtils.isNotTrue(head)) {

			// 指定行 列设置背景色
			if (null != rowColMap && rowColMap.get(rowIndex) != null && !rowColMap.get(rowIndex).equals("-1")
					&& rowColMap.get(rowIndex).contains(cellIndex + "")) {
				setCellStyle(context, cell);
				// 某几行设置背景色
			} else if (null != rowColMap && rowColMap.get(rowIndex) != null && rowColMap.get(rowIndex).equals("-1")) {
				setCellStyle(context, cell);
			}
//            if (cell.getColumnIndex() == 8 && cell.getStringCellValue().contains("已通过")) {
//                // 拿到poi的workbook
//                Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
//                // 这里千万记住 想办法能复用的地方把他缓存起来 一个表格最多创建6W个样式
//                // 不同单元格尽量传同一个 cellStyle
//                CellStyle cellStyle = workbook.createCellStyle();
//                cellStyle.setFillForegroundColor(IndexedColors.GREEN.getIndex());
//                // 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND
//                cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
//                cell.setCellStyle(cellStyle);
//                // 由于这里没有指定dataformat 最后展示的数据 格式可能会不太正确
//                // 这里要把 WriteCellData的样式清空， 不然后面还有一个拦截器 FillStyleCellWriteHandler 默认会将 WriteCellStyle 设置到
//                // cell里面去 会导致自己设置的不一样（很关键）
//                context.getFirstCellData().setWriteCellStyle(null);
//            } 
		} else {
			// 表头

		}
	}

	private void setCellStyle(CellWriteHandlerContext context, Cell cell) {
		Workbook workbook = context.getWriteWorkbookHolder().getWorkbook();
		Font font = workbook.createFont();
		font.setFontName("宋体");
		font.setBold(true);
		if (colorIndex >= 0) {
			font.setColor(colorIndex);
		}
//		font.setFontHeightInPoints((short)11);
		CellStyle cellStyle = workbook.createCellStyle();
		cellStyle.setFillForegroundColor(bgColorIndex);
		if (bgColorIndex >= 0) {
			cellStyle.setFillForegroundColor(bgColorIndex);
		}
		// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND
		cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
		cellStyle.setFont(font);
		cellStyle.setAlignment(HorizontalAlignment.CENTER);
		cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
		cellStyle.setBorderBottom(BorderStyle.MEDIUM);
		cellStyle.setBorderLeft(BorderStyle.MEDIUM);
		cellStyle.setBorderRight(BorderStyle.MEDIUM);
		cellStyle.setBorderTop(BorderStyle.MEDIUM);

		// 样式写入单元格
		cell.setCellStyle(cellStyle);

		// 由于这里没有指定dataformat 最后展示的数据 格式可能会不太正确
		// 这里要把 WriteCellData的样式清空， 不然后面还有一个拦截器 FillStyleCellWriteHandler 默认会将
		// WriteCellStyle 设置到
		// cell里面去 会导致自己设置的不一样
		context.getFirstCellData().setWriteCellStyle(null);
	}

	/**
	 * 表头背景色等设置
	 * 
	 * @return
	 */
	public static HorizontalCellStyleStrategy getStyleStrategy() {

		// 头的策略
		WriteCellStyle headWriteCellStyle = new WriteCellStyle();
		// 设置对齐
		// headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.LEFT);
		// 背景色, 设置为绿色，也是默认颜色
		headWriteCellStyle.setFillForegroundColor(IndexedColors.CORNFLOWER_BLUE.getIndex());
		// 字体
		// WriteFont headWriteFont = new WriteFont();
		// headWriteFont.setFontHeightInPoints((short) 12);
		// headWriteCellStyle.setWriteFont(headWriteFont);

		// 内容的策略
		WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
		// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了
		// FillPatternType所以可以不指定
		// contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
		contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
		// 背景绿色
		contentWriteCellStyle.setFillForegroundColor(IndexedColors.WHITE1.getIndex());

		// 字体策略
		WriteFont contentWriteFont = new WriteFont();
		// contentWriteFont.setFontHeightInPoints((short) 12);
		contentWriteCellStyle.setWriteFont(contentWriteFont);
		// 设置 自动换行
		contentWriteCellStyle.setWrapped(true);
		// 设置 垂直居中
		contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
		// 设置 水平居中
		contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
		// 设置边框样式
		contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);
		contentWriteCellStyle.setBorderTop(BorderStyle.THIN);
		contentWriteCellStyle.setBorderRight(BorderStyle.THIN);
		contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);

		// 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
		HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle,
				contentWriteCellStyle);
		return horizontalCellStyleStrategy;
	}
}

3.工具类-导出  ExcelUtils

package com.yintong.xgj.common.util.excel;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Set;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.springframework.beans.BeanUtils;
import org.springframework.web.multipart.MultipartFile;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.util.DateUtils;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.metadata.fill.FillConfig;
import com.alibaba.excel.write.metadata.fill.FillWrapper;


/**
 * excel工具类
 *
 */
public class ExcelUtils {

	/**
	 * Excel导出
	 *
	 * @param response  response
	 * @param fileName  文件名
	 * @param sheetName sheetName
	 * @param list      数据List
	 * @param pojoClass 对象Class
	 * @param columns   自定义列表
	 */
	public static void exportExcel(HttpServletResponse response, String fileName, String sheetName, List list,
			Class pojoClass, Set columns) throws IOException {
		if (StringUtils.isBlank(fileName)) {
			// 当前日期
			fileName = DateUtils.format(new Date());
		}

		response.setContentType("application/vnd.ms-excel");
		response.setCharacterEncoding("UTF-8");
		fileName = URLEncoder.encode(fileName, "UTF-8");
		response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
		// 写入合计行样式；默认表头只有一行
//        TotalRowHandler totalRowHandler = new TotalRowHandler(list.size());
		// 指定行列
		HashMap rowColMap = new HashMap<>();
//        rowColMap.put(1,"1,2");
//        rowColMap.put(2,"2");
		rowColMap.put(list.size(), "-1");// 合计行，最后一行设置颜色
		CustomCellWriteHandler totalRowHandler = new CustomCellWriteHandler((short) -1, IndexedColors.RED.index,
				rowColMap);
		if (columns != null && columns.size() > 0) {// 自定义列
			EasyExcel.write(response.getOutputStream(), pojoClass).includeColumnFieldNames(columns)
					.registerWriteHandler(CustomCellWriteHandler.getStyleStrategy())
					.registerWriteHandler(totalRowHandler).sheet(sheetName).doWrite(list);
		} else {
			EasyExcel.write(response.getOutputStream(), pojoClass)
					.registerWriteHandler(CustomCellWriteHandler.getStyleStrategy())
					.registerWriteHandler(totalRowHandler).sheet(sheetName).doWrite(list);
		}

	}

	/**
	 * Excel导出，先sourceList转换成List，再导出
	 *
	 * @param response    response
	 * @param fileName    文件名
	 * @param sheetName   sheetName
	 * @param sourceList  原数据List
	 * @param targetClass 目标对象Class
	 */
	public static void exportExcelToTarget(HttpServletResponse response, String fileName, String sheetName,
			List sourceList, Class targetClass, Set columns) throws Exception {
		List