JAVA poi exports Excel and merges cells (direct copy can be used)
before the merger
after the merger
Not much to say, just go to the code
1. Entity tools
package com.ruoyi.scenic.domain;
import lombok.Data;
@Data
public class PoiModel {
private String content;
private String oldContent;
private int rowIndex;
private int cellIndex;
}
2. Excel export tools
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;
}
}
3. Test test class
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);
}
Original blog: 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-2 all sobaiduweb~default-8-124817923.nonecase&spm = 1018.2226.3001.4187