java读取Excel文件

package restart;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

import java.io.FileInputStream;
import java.io.FileOutputStream;// code run against the jakarta-poi-1.5.0-FINAL-20020506.jar.
import java.io.IOException;

public class Cls_Read_Write {
static public void main(String[] args) throws Exception {
// FileOutputStream fos = new FileOutputStream("c://scylla//java.xls");
// HSSFWorkbook wb = new HSSFWorkbook();
// HSSFSheet s = wb.createSheet();
// wb.setSheetName(0, "first sheet");
// HSSFRow row = s.createRow(0);
// HSSFCell cell = row.createCell((short) 0);
// cell.setCellValue("Hello! This message is generated from POI.");
// wb.write(fos);
// fos.close();

POIFSFileSystem fs = null;
HSSFWorkbook wb = null;
try {
fs = new POIFSFileSystem(new FileInputStream("c://scylla//java.xls"));
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
}
if(wb==null)
{
System.out.println("wb is null!");
return;
}
else
for (int numSheets = 0; numSheets < wb.getNumberOfSheets(); numSheets++) {
if (null != wb.getSheetAt(numSheets)) {
HSSFSheet sheet = wb.getSheetAt(numSheets);// 獲得一個sheet
for (int rowNumOfSheet = 0; rowNumOfSheet <= sheet.getLastRowNum(); rowNumOfSheet++) {
if (null != sheet.getRow(rowNumOfSheet)) {
HSSFRow row = sheet.getRow(rowNumOfSheet);// 獲得一個行
for (short cellNumOfRow = 0; cellNumOfRow < row.getLastCellNum(); cellNumOfRow++) {
if (null != row.getCell(cellNumOfRow)) {
HSSFCell cell = row.getCell(cellNumOfRow);// 獲得列值
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
if(cell.getCellType()==1){
String msg = cell.getStringCellValue();
System.out.print(msg + " ");
}
else if(cell.getCellType()==0){
double msg = cell.getNumericCellValue();
System.out.print(msg + " ");
}
if (cellNumOfRow == row.getLastCellNum()-1) {
System.out.println("");
}
}
}
}
}
}
}
// for (int numSheets = 0; numSheets <
// wb.getNumberOfSheets();numSheets++) {
// if (null != wb.getSheetAt(numSheets)) {
// HSSFSheet aSheet = wb.getSheetAt(numSheets);// 獲得一個sheet
// for (int rowNumOfSheet = 0; rowNumOfSheet <=
// aSheet.getLastRowNum();rowNumOfSheet++) {
// if (null != aSheet.getRow(rowNumOfSheet)) {
// HSSFRow aRow = aSheet.getRow(rowNumOfSheet); // 獲得一個行
// for (short cellNumOfRow = 0; cellNumOfRow <= aRow .getLastCellNum();
// cellNumOfRow++) {
// if (null != aRow.getCell(cellNumOfRow)) {
// HSSFCell aCell = aRow.getCell(cellNumOfRow);// 獲得列值
// content.append(aCell.getStringCellValue());
// }
// }
// }
// }
// }
// }
}
}

package restart;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;
import java.io.FileOutputStream;

public class NewXls {

public static String outputFile = "c:/junman/ gongye.xls";

public static void main(String argv[]) {
try {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet();
HSSFRow row = sheet.createRow((short) 0);
HSSFCell cell = row.createCell((short) 0);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue("yestoday");
FileOutputStream fOut = new FileOutputStream(outputFile);
workbook.write(fOut);
fOut.flush();
fOut.close();
System.out.println("文件生成...");
} catch (Exception e) {
System.out.println("已運行 xlCreate() : " + e);
}
}
}