可以讀取xls和xlsx兩種後綴的Excel文件,需要導入poi包(我用的poi-3.8.jar),poi-ooxml包,xmlbeans包,並且用到了log4j日誌包,代碼如下:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import org.apache.mypoi.hssf.usermodel.HSSFWorkbook;
import org.apache.mypoi.ss.usermodel.Cell;
import org.apache.mypoi.ss.usermodel.Row;
import org.apache.mypoi.ss.usermodel.Sheet;
import org.apache.mypoi.ss.usermodel.Workbook;
import org.apache.mypoi.xssf.usermodel.XSSFWorkbook;
/**
* excel讀寫工具類
*/
public class ExcelReader {
private static Logger logger = Logger.getLogger(ExcelReader.class);
private final static String xls = "xls";
private final static String xlsx = "xlsx";
/**
* 讀入excel文件,解析後返回
* @param file
* @throws IOException
*/
public static List<String[]> readExcel(File file) throws IOException{
//檢查文件
checkFile(file);
//獲得Workbook工作薄對象
Workbook workbook = getWorkBook(file);
//創建返回對象,把每行中的值作爲一個數組,所有行作爲一個集合返回
List<String[]> list = new ArrayList<String[]>();
if(workbook != null){
for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
//獲得當前sheet工作表
Sheet sheet = workbook.getSheetAt(sheetNum);
if(sheet == null){
continue;
}
//獲得當前sheet的開始行
int firstRowNum = sheet.getFirstRowNum();
//獲得當前sheet的結束行
int lastRowNum = sheet.getLastRowNum();
//循環除了第一行的所有行
for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
//獲得當前行
Row row = sheet.getRow(rowNum);
if(row == null){
continue;
}
//獲得當前行的開始列
int firstCellNum = row.getFirstCellNum();
//獲得當前行的列數
int lastCellNum = row.getPhysicalNumberOfCells();
String[] cells = new String[row.getPhysicalNumberOfCells()];
//循環當前行
for(int cellNum = firstCellNum; cellNum<lastCellNum+firstCellNum;cellNum++){
Cell cell = row.getCell(cellNum);
cells[cellNum-firstCellNum] = getCellValue(cell);
}
list.add(cells);
}
}
}
return list;
}
public static void checkFile(File file) throws IOException{
//判斷文件是否存在
if(null == file||!file.exists()){
logger.error("文件不存在!");
throw new FileNotFoundException("文件不存在!");
}
//獲得文件名
String fileName = file.getName();
//判斷文件是否是excel文件
if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
logger.error(fileName + "不是excel文件");
throw new IOException(fileName + "不是excel文件");
}
}
public static Workbook getWorkBook(File file) {
//獲得文件名
String fileName = file.getName();
//創建Workbook工作薄對象,表示整個excel
Workbook workbook = null;
try {
//獲取excel文件的io流
InputStream is = new FileInputStream(file);
//根據文件後綴名不同(xls和xlsx)獲得不同的Workbook實現類對象
if(fileName.endsWith(xls)){
//2003
workbook = new HSSFWorkbook(is);
}else if(fileName.endsWith(xlsx)){
//2007
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
logger.info(e.getMessage());
}
return workbook;
}
public static String getCellValue(Cell cell){
String cellValue = "";
if(cell == null){
return cellValue;
}
//把數字當成String來讀,避免出現1讀成1.0的情況
if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
cell.setCellType(Cell.CELL_TYPE_STRING);
}
//判斷數據的類型
switch (cell.getCellType()){
case Cell.CELL_TYPE_NUMERIC: //數字
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING: //字符串
cellValue = String.valueOf(cell.getStringCellValue());
break;
case Cell.CELL_TYPE_BOOLEAN: //Boolean
cellValue = String.valueOf(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_FORMULA: //公式
cellValue = String.valueOf(cell.getCellFormula());
break;
case Cell.CELL_TYPE_BLANK: //空值
cellValue = "";
break;
case Cell.CELL_TYPE_ERROR: //故障
cellValue = "非法字符";
break;
default:
cellValue = "未知類型";
break;
}
return cellValue;
}
}