JAVA poi导出Excel 并且合并单元格 (直接拷贝就能使用)
合并前
合并后
活不多说,直接上代码
一、实体工具类
package com.ruoyi.scenic.domain;
import lombok.Data;
@Data
public class PoiModel {
private String content;
private String oldContent;
private int rowIndex;
private int cellIndex;
}
二、Excel导出工具类
package com.ruoyi.scenic.utils;
import com.ruoyi.scenic.domain.PoiModel;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
public class ExcelUtils {
/**
* 判断是不是数字
*
* @param str
* @return
*/
private static boolean isNumeric(String str) {
if (str == null || str.length() == 0) {
return false;
}
Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
return pattern.matcher(str).matches();
}
/*
* @param objData 数据
* @param fileName 文件名
* @param sheetName sheet名
* @param columns 表头
* @param mergeIndex 需要合并的列号集合 ,在不确定的情况下 有多少列就填充多少条
* @param request
* @param response
* @return
*/
public static int exportToExcelForXlsx(List<List> objData, String fileName, String sheetName, List<String> columns, List mergeIndex, HttpServletResponse response) {
int flag = 0;
// 创建工作薄
XSSFWorkbook wb = new XSSFWorkbook();
// sheet1
XSSFSheet sheet1 = wb.createSheet(sheetName);
//设置样式
XSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HorizontalAlignment.CENTER);//水平对齐
//表头
sheet1.createFreezePane(0, 1);//冻结表头
XSSFRow sheet1row1 = sheet1.createRow((short) 0);
sheet1row1.setHeight((short) 480);
//写入表头
if (columns != null && columns.size() > 0) {
for(int i=0;i<columns.size();i++) {
String column = columns.get(i);
//列
XSSFCell cell = sheet1row1.createCell(i);
cell.setCellValue(column);
}
}
int dataSatrtIndex = 1;//数据开始行
boolean isMerge = false;
if(mergeIndex != null && mergeIndex.size() != 0) {
isMerge = true;
}
//写入数据
if (objData != null && objData.size() > 0) {
Map<Integer, PoiModel> poiModels = new HashMap<Integer, PoiModel>();
//循环写入表中数据
int i = 0;
for ( ; i < objData.size(); i++) {
//数据行
XSSFRow row = sheet1.createRow((short) (i+dataSatrtIndex));
//行内循环，既单元格（列）
List<Object> list = objData.get(i);
DecimalFormat decimalFormat = new DecimalFormat("0.00");
int j = 0;
for (Object o : list) {
//数据列
String content = "";
if(o != null) {
if (o.toString().contains(".") && isNumeric(o.toString())) {
content = decimalFormat.format(Float.valueOf(o.toString()));
} else if (o.toString().contains("-") && o.toString().contains(":")) {
content = String.valueOf(o).split("\\.")[0];
}else {
content = String.valueOf(o);
}
}
if(isMerge && mergeIndex.contains(j)) {
//如果该列需要合并
PoiModel poiModel = poiModels.get(j);
if(poiModel == null) {
poiModel = new PoiModel();
poiModel.setContent(content);
poiModel.setRowIndex(i + dataSatrtIndex);
poiModel.setCellIndex(j);
poiModels.put(j, poiModel);
}else {
if(!poiModel.getContent().equals(content)) {
//如果不同了，则将前面的数据合并写入
XSSFRow lastRow = sheet1.getRow(poiModel.getRowIndex());
XSSFCell lastCell = lastRow.createCell(poiModel.getCellIndex());//创建列
lastCell.setCellValue(poiModel.getContent());
//合并单元格
if(poiModel.getRowIndex() != i + dataSatrtIndex - 1) {
sheet1.addMergedRegion(new CellRangeAddress(poiModel.getRowIndex(), i + dataSatrtIndex - 1, poiModel.getCellIndex(), poiModel.getCellIndex()));
}
//将新数据存入
poiModel.setContent(content);
poiModel.setRowIndex(i + dataSatrtIndex);
poiModel.setCellIndex(j);
poiModels.put(j, poiModel);
}
}
row.createCell(j);//创建单元格
}else {
//该列不需要合并
//数据列
XSSFCell cell = row.createCell(j);
cell.setCellValue(content);
}
j++;
}
}
//将最后一份存入
if(poiModels != null && poiModels.size() != 0) {
for(Integer key : poiModels.keySet()) {
PoiModel poiModel = poiModels.get(key);
XSSFRow lastRow = sheet1.getRow(poiModel.getRowIndex());
XSSFCell lastCell = lastRow.getCell(poiModel.getCellIndex());
lastCell.setCellValue(poiModel.getContent());
//合并单元格
if(poiModel.getRowIndex() != i + dataSatrtIndex -1) {
sheet1.addMergedRegion(new CellRangeAddress(poiModel.getRowIndex(), i + dataSatrtIndex - 1, poiModel.getCellIndex(), poiModel.getCellIndex()));
}
}
}
} else {
flag = -1;
}
//设置固定列宽，大概规律网上有不少版本自行百度
//这里大概是143像素
for (int i = 0; i < columns.size(); i++) {
sheet1.setColumnWidth(i, 4550);
}
OutputStream os = null;
try {
// 创建一个普通输出流
os = response.getOutputStream();
fileName = "file.xls";
// 请求浏览器打开下载窗口
response.reset();
response.setCharacterEncoding("UTF-8");
fileName = new String(fileName.getBytes(), "ISO8859-1");
response.setHeader("Content-Disposition", "attachment; filename=" + fileName);// 要保存的文件名
response.setContentType("application/octet-stream");
wb.write(os);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
wb.close();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return flag;
}
}
三、Test测试类
public static void main(String[] args) {
List columns = new ArrayList<>();//标头
columns.add("目录");
columns.add("目录");
columns.add("目录");
columns.add("内容");
String fileName = "文件名字";//文件名字
String sheetName = "sheet名字";//sheet名字
// 内容数据
List<List> exportData = new ArrayList<>();
//行内的数据
List rowData = new ArrayList();
rowData.add("一级目录1");
rowData.add("二级目录1");
rowData.add("三级目录1");
rowData.add("内容1");
exportData.add(rowData);
List rowData2 = new ArrayList();
rowData2.add("一级目录1");
rowData2.add("二级目录1");
rowData2.add("三级目录1");
rowData2.add("内容2");
exportData.add(rowData2);
List rowData3 = new ArrayList();
rowData3.add("一级目录1");
rowData3.add("二级目录1");
rowData3.add("三级目录2");
rowData3.add("内容3");
exportData.add(rowData3);
List rowData4 = new ArrayList();
rowData4.add("一级目录1");
rowData4.add("二级目录1");
rowData4.add("三级目录2");
rowData4.add("内容4");
exportData.add(rowData4);
List rowData5 = new ArrayList();
rowData5.add("一级目录1");
rowData5.add("二级目录2");
rowData5.add("三级目录3");
rowData5.add("内容5");
exportData.add(rowData5);
List rowData6 = new ArrayList();
rowData6.add("一级目录1");
rowData6.add("二级目录2");
rowData6.add("三级目录3");
rowData6.add("内容6");
exportData.add(rowData6);
//需要合并的列号 在不确定的情况下 最好有多少列就填充几条
List mergeIndex = new ArrayList();
mergeIndex.add(0);
mergeIndex.add(1);
mergeIndex.add(2);
mergeIndex.add(3);
int flag = exportToExcelForXlsx(exportData, fileName, sheetName, columns, mergeIndex);
System.out.println(flag);
}
原博：https://blog.csdn.net/CSDNxiaoxuan/article/details/124817923?ops_request_misc=&request_id=&biz_id=102&utm_term=java%E5%AF%BC%E5%87%BAexcel%E5%90%88%E5%B9%B6%E5%8D%95%E5%85%83%E6%A0%BC&utm_medium=distribute.pc_search_result.none-task-blog-2allsobaiduweb~default-8-124817923.nonecase&spm=1018.2226.3001.4187