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: <Excel导出类>
*@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);
}
}