一，JExcelAPI與Apache POI兩者對比
1、JExcelAPI不適合商業應用，它都是會莫名其妙的讀不出來數據。
2、Apache POI是一純Java的實現，不僅能讀微軟的Excel還可以讀Open Office的，新版HSSF3.0還添加了讀取Power Point的功能。總之是一種非常穩定，強大的實現。推薦使用。
二
Jexcelapi的使用參考：http://blog.csdn.net/yfhdsz/archive/2006/10/30/1356670.aspx
apache POI 參考：http://blog.csdn.net/yuansicau/archive/2006/08/31/1150046.aspx
關鍵是要理解
java讀取excel文件的順序是：
Excel文件->工作表->行->單元格 對應到POI中，爲：workbook->sheet->row->cell
注意：
注意：
1.sheet， 以0開始，以workbook.getNumberOfSheets()-1結束
2.row， 以0開始(getFirstRowNum)，以getLastRowNum結束
3.cell， 以0開始(getFirstCellNum)，以getLastCellNum結束,
結束的數目不知什麼原因與顯示的長度不同，可能會偏長
如何插圖片到Excel中
public static void createPicture() {
FileOutputStream fileOut = null;
BufferedImage bufferImg = null;
BufferedImage bufferImg1 = null;
try {
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
ByteArrayOutputStream byteArrayOut1 = new ByteArrayOutputStream();
bufferImg = ImageIO.read(new File("C:/Documents and Settings/All Users/Documents/My Pictures/示例圖片/Sunset.jpg"));
bufferImg1 = ImageIO.read(new File("C:/Documents and Settings/All Users/Documents/My Pictures/示例圖片/Water lilies.jpg"));
ImageIO.write(bufferImg, "jpeg", byteArrayOut);
ImageIO.write(bufferImg1, "jpeg", byteArrayOut1);
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
// HSSFRow row = sheet1.createRow(2);
HSSFPatriarch patriarch = sheet1.createDrawingPatriarch();
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 512, 255,
(short) 0, 0, (short) 10, 10);
HSSFClientAnchor anchor1 = new HSSFClientAnchor(0, 0, 512, 255,
(short) 0, 15, (short) 10, 20);
/**
* public HSSFClientAnchor(int dx1, int dy1, int dx2, int dy2, short
* col1, int row1, short col2, int row2)
* Creates a new client anchor
* and sets the top-left and bottom-right coordinates of the anchor.
*
* Parameters: dx1 - the x coordinate within the first cell.
* dy1 - the y coordinate within the first cell.
* dx2 - the x coordinate within the second cell.
* dy2 - the y coordinate within the second cell.
* col1 - the column (0 based) of the first cell.
* row1 - the row (0 based) of the first cell.
* col2 - the column (0 based) of the second cell.
* row2 - the row (0 based) of the second cell.
* 注意:(col1,row1)表示圖片左上角所在單元格
* (col2,row2)表示圖片右下角所在單元格,
* 先是列,再行,順序不要反了.
* (dx1,dy1)表示圖片左上角在單元格中的座標.
* ((dx2,dy2)表示圖片右下角在單元格中的座標.
*/
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut
.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
patriarch.createPicture(anchor1, wb.addPicture(byteArrayOut1
.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
fileOut = new FileOutputStream("e:/study/workbook.xls");
wb.write(fileOut);
fileOut.close();
} catch (IOException io) {
io.printStackTrace();
System.out.println("io erorr : " + io.getMessage());
} finally {
if (fileOut != null)
try {
fileOut.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}