Java Excel导出复杂excel表格样式之ExcelUtil工具类

Java Excel导出包括普通导出及复杂表格样式，主要是对于需要进行行列合并的列进行特殊处理，计算清楚起始行，结束行，起始列，结束列。
普通导出可以是所有列，也可以是包含某些列，或者排除某些列；

1. 效果图

2. 原理

如对于上图中的覆盖能力，需要A2，A3，A4行列进行合并，则传参

// 表示要执行合并的行是第一行，从第1行到第3行，从第0列到第0列；注意这里excel的行列编号下表index都是从0开始的。
mergeRowColCell(sheet, 1, 1, 3, 0, 0, ‘覆盖能力’,valStyle);

3. 源码

3.1 pom

<!--easyexcel 依赖-->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.1.6</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.17</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>3.17</version>
</dependency>

3.2 ExcelUtil工具类

package com.example.restservice.utils;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.support.ExcelTypeEnum;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

/*************************************
 *Class Name: ExcelUtil
 *Description: 
 *@author: Seminar
 *@create: 2022/4/6
 *@since 1.0.0
 *************************************/
public class ExcelUtil {

    public static final String UNDERLINE = "_";

    public static ServletOutputStream setResponseParam(HttpServletResponse response, String fileName) throws IOException {
        String value = "attachment; filename=" + new String(
                (fileName + UNDERLINE + new SimpleDateFormat("yyyyMMdd").format(new Date()) + ExcelTypeEnum.XLS.getValue()).getBytes("gb2312"), "ISO8859-1");
        response.setCharacterEncoding("utf-8");
        response.setContentType("application/vnd.openxmlformats.officedocument.spreadsheetml.sheet");
        response.setHeader("Content-disposition", value);
        return response.getOutputStream();
    }


    public static void exportExcel(HttpServletResponse response, String fileName, Class clazz, List data) throws IOException {
        OutputStream os = setResponseParam(response, fileName);
        EasyExcel.write(os, clazz).sheet(fileName).doWrite(data);
    }

    public static void exportExcelIncludeColumns(HttpServletResponse response, String fileName, Class clazz, List data, List<String> columns) throws IOException {
        OutputStream os = setResponseParam(response, fileName);
        EasyExcel.write(os, clazz).includeColumnFiledNames(columns).sheet(fileName).doWrite(data);
    }

    public static void exportExcelExcludeColumns(HttpServletResponse response, String fileName, Class clazz, List data, List<String> columns) throws IOException {
        OutputStream os = setResponseParam(response, fileName);
        EasyExcel.write(os, clazz).excludeColumnFiledNames(columns).sheet(fileName).doWrite(data);
    }

    /**
     * 定制导出Excel
     *
     * @param response
     * @param fileName sheet名称
     * @param title    标题
     * @param data     表格数据
     * @return
     */
    public static void exportExcelPj(HttpServletResponse response, String fileName, String[] title, String[][] data) throws IOException {
        OutputStream os = setResponseParam(response, fileName);

        // 第一步，创建一个HSSFWorkbook，对应一个Excel文件
        HSSFWorkbook wb = new HSSFWorkbook();

        // 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(fileName);
        // 设置列宽
        sheet.setColumnWidth(0, 5000);
        sheet.setColumnWidth(2, 5000);

        // 第三步，在sheet中添加表头第0行
        HSSFRow row1 = sheet.createRow(0);

        // 第四步，创建单元格，并设置表头居中及值的样式
        HSSFCellStyle style = wb.createCellStyle();
        style.setFillBackgroundColor(IndexedColors.GREEN.getIndex());
        style.setAlignment(HorizontalAlignment.CENTER); // 创建一个居中格式
        style.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中

        HSSFCellStyle leftStyle = wb.createCellStyle();
        leftStyle.setFillBackgroundColor(IndexedColors.GREEN.getIndex());
        leftStyle.setAlignment(HorizontalAlignment.LEFT); // 创建一个居中格式

        HSSFCell cell = null;
        // 创建标题
        for (int i = 0; i < title.length; i++) {
            cell = row1.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }

        //合并单元格的内容
        List<String> mergeCells = Arrays.asList(new String[]{"覆盖能力（20分）", "获取成本（10分）", "数据质量（60分）",
                "产线支持（10分）", "附带价值（10分）", "总分"});
        for (int i = 0; i < data.length; i++) {
            //创建内容
            row1 = sheet.createRow(i + 1);
            for (int j = 0; j < data[i].length; j++) {
                //将内容按顺序赋给对应的列对象
                cell = row1.createCell(j);
                cell.setCellValue(data[i][j]);
                // 设置评价指标列居左，其他的列剧中
                if (j == 2) {
                    cell.setCellStyle(leftStyle);
                } else {
                    cell.setCellStyle(style);
                }
            }
        }

        mergeRowColCell(sheet, 1, 1, 3, 0, 0, mergeCells.get(0), style);
        mergeRowColCell(sheet, 4, 4, 6, 0, 0, mergeCells.get(1), style);
        mergeRowColCell(sheet, 7, 7, 13, 0, 0, mergeCells.get(2), style);
        mergeRowColCell(sheet, 14, 14, 14, 0, 0, mergeCells.get(3), style);
        mergeRowColCell(sheet, 15, 15, 15, 0, 0, mergeCells.get(4), style);
        mergeRowColCell(sheet, 16, 16, 16, 1, 3, "", style);
        mergeRowColCell(sheet, 16, 16, 16, 0, 0, mergeCells.get(5), style);

        wb.write(os);
        os.flush();
        os.close();
    }

    /**
     * 表格合并方法
     *
     * @param sheet    表格sheet
     * @param rowIndex 要执行合并的行
     * @param firstRow 首行
     * @param lastRow  尾行
     * @param firstCol 首列
     * @param lastCol  尾列
     * @param cellVal  合并后的单元格值
     * @param valStyle 合并后的单元格样式
     */
    private static void mergeRowColCell(HSSFSheet sheet, int rowIndex, int firstRow, int lastRow, int firstCol, int lastCol, String cellVal, HSSFCellStyle valStyle) {
        if (!(firstRow == lastRow && firstCol == lastCol)) {
            // 合并单元格
            CellRangeAddress callRangeAddress = new CellRangeAddress(firstRow, lastRow, firstCol, lastCol);//起始行,结束行,起始列,结束列
            sheet.addMergedRegion(callRangeAddress);
        }
        HSSFRow row = sheet.getRow(rowIndex);
        HSSFCell cell = row.createCell(0);
        cell.setCellValue(cellVal);
        cell.setCellStyle(valStyle);
    }
}