springboot+POI读取Excel表格(可以含有合并单元格)
本编文章主要写了如何通过POI获取Excel表格(含合并单元格)的数据，可以获取任意sheet表中的数据，然后返回list
需要有poi-4.0.0.jar和poi-ooxml-4.0.0.jar2个jar包
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class ExcelUtil {
/**
*现在传的是MultipartFile ，可以自行修改成String path
* 当是path 时 ，使用 Workbook wb = WorkbookFactory.create(new File(path));获取
**/
public static List<String[]> readExcel(MultipartFile excelInput, int startrow, int sheetnum) {
Workbook workbook = null;
InputStream inputStream = null;
List<String[]> list = new ArrayList<String[]>();
try {
inputStream = excelInput.getInputStream();
workbook = WorkbookFactory.create(inputStream);
//当使用路径时使用 Workbook wb = WorkbookFactory.create(new File(path));
int numberOfSheets = workbook.getNumberOfSheets();//sheet表
if (numberOfSheets >= sheetnum) {
Sheet sheet = workbook.getSheetAt(sheetnum);
if (null != sheet) {
// 获得当前sheet的开始行
//int firstRowNum = sheet.getFirstRowNum();
// 获得当前sheet的结束行
int lastRowNum = sheet.getLastRowNum();
for (int rowNum = startrow; rowNum <= lastRowNum; rowNum++) {
// 获得当前行
Row row = sheet.getRow(rowNum);
if (row == null) {
continue;
}
// 获得当前行的开始列
// int firstCellNum = row.getFirstCellNum();
// 获得当前行的列数
int lastCellNum = row.getLastCellNum();
String[] cells = new String[lastCellNum];
// 循环当前行
for (Cell c : row) {//获取每列数据
int regions = sheet.getNumMergedRegions();//是否含有合并的单元格
if (regions > 0) {
boolean isMerge = isMergedRegion(sheet, rowNum, c.getColumnIndex());
// 判断是否具有合并单元格
if (isMerge) {
String value = getMergedRegionValue(sheet, row.getRowNum(), c.getColumnIndex());
cells[c.getColumnIndex()] = value;
} else {
cells[c.getColumnIndex()] = getCellValue(c);
}
} else {
cells[c.getColumnIndex()] = getCellValue(c);
}
}
list.add(cells);
}
}
}
} catch (Exception e1) {
e1.printStackTrace();
} finally {
if (null != workbook) {
try {
workbook.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != inputStream) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return list;
}
/**
* 获取合并单元格的值
*/
public static String getMergedRegionValue(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress ca = sheet.getMergedRegion(i);
int firstColumn = ca.getFirstColumn();
int lastColumn = ca.getLastColumn();
int firstRow = ca.getFirstRow();
int lastRow = ca.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
Row fRow = sheet.getRow(firstRow);
Cell fCell = fRow.getCell(firstColumn);
return getCellValue(fCell);
}
}
}
return null;
}
/**
* 判断指定的单元格是否是合并单元格
* @param row 行下标
* @param column 列下标
*/
private static boolean isMergedRegion(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
return true;
}
}
}
return false;
}
//读取每个单元格的数据
public static String getCellValue(Cell cell) {
String cellValue = "";
if (cell == null) {
return cellValue;
}
// 判断数据的类型
switch (cell.getCellType()) {
case NUMERIC: // 数字 又分为纯数字和时间
cellValue = stringDateProcess(cell);
break;
case STRING: // 字符串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case BOOLEAN: // Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case FORMULA: // 公式
cellValue = String.valueOf(cell.getCellFormula());
break;
case BLANK: // 空值
cellValue = "";
break;
case ERROR: // 故障
cellValue = "非法字符";
break;
default:
cellValue = "无";
break;
}
return cellValue;
}
/**
* 时间格式转换
*
* @param cell
* @return
*/
public static String stringDateProcess(Cell cell) {
String result = "";
if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
SimpleDateFormat sdf = null;
if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) {
sdf = new SimpleDateFormat("HH:mm ");
} else {// 日期
sdf = new SimpleDateFormat("yyyy-MM-dd");
}
Date date = cell.getDateCellValue();
result = sdf.format(date);
} else if (cell.getCellStyle().getDataFormat() == 58) {
// 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58)
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
double value = cell.getNumericCellValue();
Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value);
result = sdf.format(date);
} else {
double value = cell.getNumericCellValue();
CellStyle style = cell.getCellStyle();
DecimalFormat format = new DecimalFormat();
String temp = style.getDataFormatString();
// 单元格设置成常规
if (temp.equals("General")) {
format.applyPattern("#");
}
result = format.format(value);
}
return result;
}
}