最近用上了导入excel表格处理保存到后台数据库的功能!利用的是org.apache.poi进行处理
示例代码:
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
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;
/**
* Created by LiYangYong on 2022/02/06
*/
public class ExcelUtil {
private final static String excel2003L =".xls"; //2003- 版本的excel
private final static String excel2007U =".xlsx"; //2007+ 版本的excel
/**
* 描述:获取IO流中的数据,组装成List<List<Object>>对象
* @param in,fileName
* @return
* @throws IOException
*/
public static List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{
List<List<Object>> list = null;
//创建Excel工作薄
Workbook work = getWorkbook(in,fileName);
if(null == work){
throw new Exception("创建Excel工作薄为空!");
}
Sheet sheet = null;
Row row = null;
Cell cell = null;
list = new ArrayList<List<Object>>();
//遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if(sheet==null){continue;}
//遍历当前sheet中的所有行
for (int j = sheet.getFirstRowNum()+1; j < sheet.getLastRowNum()+1; j++) {
row = sheet.getRow(j);
if(row==null){continue;}
// if(row==null||row.getFirstCellNum()==j){continue;}
//遍历所有的列
List<Object> li = new ArrayList<Object>();
for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
li.add(getCellValue(cell));
}
list.add(li);
}
}
//work.close();
return list;
}
/**
* 描述:根据文件后缀,自适应上传文件的版本
* @param inStr,fileName
* @return
* @throws Exception
*/
public static Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if(excel2003L.equals(fileType)){
wb = new HSSFWorkbook(inStr); //2003-
}else if(excel2007U.equals(fileType)){
wb = new XSSFWorkbook(inStr); //2007+
}else{
throw new Exception("解析的文件格式有误!");
}
return wb;
}
/**
* 描述:对表格中数值进行格式化
* @param cell
* @return
*/
public static Object getCellValue2(Cell cell){
Object value = null;
DecimalFormat df = new DecimalFormat("0"); //格式化number String字符
SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd"); //日期格式化
DecimalFormat df2 = new DecimalFormat("0.00"); //格式化数字
switch (cell.getCellType()) {
case Cell.CELL_TYPE_STRING:
value = cell.getRichStringCellValue().getString();
break;
case Cell.CELL_TYPE_NUMERIC:
if("General".equals(cell.getCellStyle().getDataFormatString())){
value = df.format(cell.getNumericCellValue());
}else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){
value = sdf.format(cell.getDateCellValue());
}else{
value = df2.format(cell.getNumericCellValue());
}
break;
case Cell.CELL_TYPE_BOOLEAN:
value = cell.getBooleanCellValue();
break;
case Cell.CELL_TYPE_BLANK:
value = "";
break;
default:
break;
}
return value;
}
@SuppressWarnings("deprecation")
public static String getCellValue(Cell cell) {
if (cell == null)
return "";
if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
return cell.getStringCellValue();
} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
return String.valueOf(cell.getBooleanCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
return cell.getCellFormula();
} else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
short format = cell.getCellStyle().getDataFormat();
System.out.println("format:"+format+";;;;;value:"+cell.getNumericCellValue());
SimpleDateFormat sdf = null;
if (format == 14 || format == 31 || format == 57 || format == 58
|| (176<=format && format<=178) || (182<=format && format<=196)
|| (210<=format && format<=213) || (208==format ) ) { // 日期
sdf = new SimpleDateFormat("yyyy-MM-dd");
} else if (format == 20 || format == 32 || format==183 || (200<=format && format<=209) ) { // 时间
sdf = new SimpleDateFormat("HH:mm");
} else { // 不是日期格式
return String.valueOf(cell.getNumericCellValue());
}
double value = cell.getNumericCellValue();
Date date = DateUtil.getJavaDate(value);
if(date==null || "".equals(date)){
return "";
}
String result="";
try {
result = sdf.format(date);
} catch (Exception e) {
e.printStackTrace();
return "";
}
return result;
}
return "";
}
}
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