Apache POI 作为老牌文件处理工具，无需多言，直接上代码。
一、引入依赖
XML
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>5.2.3</version>二、工具类实现
java
import cn.hutool.core.date.DatePattern;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
public class ExcelUtil {
private static final Logger logger = LoggerFactory.getLogger(ExcelUtil.class);
private static final String EXCEL_FORMART_XLS = ".xls";
private static final String EXCEL_FORMART_XLSX = ".xlsx";
public static Workbook getWorkbook(InputStream fileInputStream, String fileName) {
Workbook wb = null;
if (ObjectUtils.isEmpty(fileInputStream)) {
return wb;
}
try {
if (!StringUtils.isEmpty(fileName) && fileName.endsWith(EXCEL_FORMART_XLS)) {
// .xls为office2003之前（包含2003）的版本
wb = new HSSFWorkbook(fileInputStream);
} else if (!StringUtils.isEmpty(fileName) && fileName.endsWith(EXCEL_FORMART_XLSX)) {
// .xlsx为office2007之后（包含2007）的版本
wb = new XSSFWorkbook(fileInputStream);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
return wb;
}
}
public static Workbook getWorkbook(File file) {
Workbook wb = null;
try {
String fileName = file.getName();
wb = getWorkbook(new FileInputStream(file), fileName);
} catch (Exception e) {
e.printStackTrace();
} finally {
return wb;
}
}
public static Workbook getWorkbook(MultipartFile file) {
Workbook wb = null;
try {
String fileName = file.getOriginalFilename();
wb = getWorkbook(file.getInputStream(), fileName);
} catch (Exception e) {
e.printStackTrace();
} finally {
return wb;
}
}
/**
* 获取sheet页
*
* @param file
* @param hasHiddern 是否包含隐藏列
* @return
*/
public static List<Sheet> getSheetsByFile(MultipartFile file, Boolean hasHiddern) {
List<Sheet> sheets = new ArrayList<>();
Workbook wb = getWorkbook(file);
if (ObjectUtils.isEmpty(wb)) {
return sheets;
}
sheets = getSheets(wb, hasHiddern);
return sheets;
}
/**
* @param workbook
* @param hasHiddern 包含隐藏列
* @return
*/
public static List<Sheet> getSheets(Workbook workbook, Boolean hasHiddern) {
List<Sheet> sheets = new ArrayList<>();
if (ObjectUtils.isEmpty(workbook)) {
return sheets;
}
int sheetNum = workbook.getNumberOfSheets();
for (int i = 0; i < sheetNum; i++) {
if (!hasHiddern && workbook.isSheetHidden(i)) {
continue;
}
sheets.add(workbook.getSheetAt(i));
}
return sheets;
}
/**
* 取得所有sheet
*
* @param workbook
* @return
*/
public static List<Sheet> getSheets(Workbook workbook) {
return getSheets(workbook, false);
}
public static Sheet getSheet(Workbook workbook, String sheetName) {
Sheet sheet = null;
if (ObjectUtils.isEmpty(workbook)) {
return sheet;
}
sheet = workbook.getSheet(sheetName);
return sheet;
}
/**
* 从sheet页内获取数据
*
* @param sheet sheet页
* @param startRow 开始行 index索引
* @param endRow 结束行 index索引
* @param startCol 开始列 index索引
* @param endCol 结束列 index索引
* @return
*/
public static LinkedHashMap<Integer, List<String>> getSheetData(Sheet sheet, int startRow, int endRow, int startCol, int endCol) {
if (ObjectUtils.isEmpty(sheet)) {
return null;
}
int totalRow = sheet.getPhysicalNumberOfRows();
if (startRow > totalRow) {
return null;
}
LinkedHashMap<Integer, List<String>> map = new LinkedHashMap<Integer, List<String>>();
endRow = (endRow > totalRow) ? totalRow : endRow;
for (int rowNum = startRow; rowNum < endRow; rowNum++) {
Row row = sheet.getRow(rowNum);
List<String> stringList = getRowData(row, startCol, endCol);
if (CollectionUtils.isEmpty(stringList) || isNullRow(stringList)) {
continue;
}
map.put(rowNum + 1, stringList);
}
return map;
}
/**
* 判断是否是空行
*
* @param rowDatas
* @return
*/
public static Boolean isNullRow(List<String> rowDatas) {
boolean isNull = true;
if (!CollectionUtils.isEmpty(rowDatas)) {
String value = String.join("", rowDatas).trim();
if (!StringUtils.isEmpty(value)) {
isNull = false;
}
}
return isNull;
}
public static List<String> getRowData(Row row, int startCol, int endCol) {
List<String> list = new ArrayList<>();
if (ObjectUtils.isEmpty(row)) {
return list;
}
int totalCol = row.getPhysicalNumberOfCells();
if (startCol > totalCol) {
return list;
}
for (int num = startCol; num < endCol; num++) {
String value = (num < totalCol) ? getStringValue(row.getCell(num)) : "";
list.add(value);
}
return list;
}
}三、具体使用
java
private Object dealImportExcel(MultipartFile file) {
// 1、获取Workbook
Workbook wb = ExcelUtil.getWorkbook(file);
if (ObjectUtils.isEmpty(wb)) {
return ResultMsg.fail("解析Excel文件失败");
}
// 2、获取sheets
List<Sheet> sheets = ExcelUtil.getSheets(wb, false);
if (CollectionUtils.isEmpty(sheets)) {
return ResultMsg.fail("导入文件中不存在sheet页");
}
// 保存数据的集合
List<SmartEnergyStatisticsLs1M5Charging> list = new ArrayList<>();
for (Sheet sheet : sheets) {
String sheetName = sheet.getSheetName();
int rows = sheet.getPhysicalNumberOfRows();
if (rows <= 1) {
logger.info("Sheet[{}]页行数不足2行，不处理该Sheet", sheetName);
continue;
}
Row row = sheet.getRow(1);
int cellCount = row.getPhysicalNumberOfCells();
if (cellCount != 5) {
logger.info("Sheet[{}]列数不是8列，不是标准数据，不处理该Sheet", sheetName);
continue;
}
logger.info("开始处理Sheet:{}", sheetName);
for (int i = 1; i < rows; i++) {
row = sheet.getRow(i);
Cell cell = row.getCell(0);
// 获取表格中时间
String month = handleTimeCell(cell);
if (Objects.isNull(month)) {
logger.error("第{}行未提取到首列日期值", (i + 1));
continue;
}
BigDecimal chargeQuantity = getBigDecimalCell(row.getCell(1));
Integer chargeTime = Integer.valueOf(row.getCell(2).getStringCellValue());
BigDecimal dischargeQuantity = getBigDecimalCell(row.getCell(3));
Integer dischargeTime = Integer.valueOf(row.getCell(4).getStringCellValue());
SmartEnergyStatisticsLs1M5Charging smartEnergyStatisticsLs1M5Charging = SmartEnergyStatisticsLs1M5Charging.builder()
.month(month)
.chargeQuantity(chargeQuantity)
.chargeTime(chargeTime)
.dischargeQuantity(dischargeQuantity)
.dischargeTime(dischargeTime)
.build();
list.add(smartEnergyStatisticsLs1M5Charging);
}
}
return batchAdd(list);
}