poi3.6对excel2007的读写
前两天项目需用到excel2007/2010，发现以前的POI包已经不能支持得到了，赶紧的到网上找了个最新的POI3.6包，可这个解析方式给我们来了个大变样，以前的在excel2003中用的那一套已经不能适用，网上能找到的又只是一些很简单的例子，没办法，自己来搞吧，好了，开工吧，本文件分别把2007的读文件和写文件的关键代码贴了出来供大家参考，如有更简洁的方式，欢迎指正：
1、读文件，其实从下面的代码中就可以看出其实读excel2007是可以基本上2003通用的，只是Workbook的对像不同而已，当然对于HSSFXXX形式的具体类都需要改成用新的接口：
public static String getHeaders(String filePath){
String ret = null;
String suffix = filePath.substring(filePath.lastIndexOf(".")); // 文件后辍.
Workbook wb = null;
FileInputStream is = new FileInputStream(new File(filePath));
if (TYPE_EXCEL2003.equals(suffix.toLowerCase())) {
try {
wb = new HSSFWorkbook(is);
ret = getHeaders(wb);
} catch (Exception e) {
throw new FatalBizException(ERROR_CODE_1);
} finally {
try {
is.close();
} //关闭流,finally里可以嵌套trycatch结构
catch (Exception e) {
}
}
} else if (TYPE_EXCEL2007.equals(suffix.toLowerCase())) {
try {
wb = new XSSFWorkbook(is);
ret = getHeaders(wb);
} catch (Exception e) {
throw new FatalBizException(ERROR_CODE_2);
}finally {
try {
is.close();
} //关闭流,finally里可以嵌套trycatch结构
catch (Exception e) {
}
}
} else {
throw new FatalBizException("不支持的文件类型！");
}
return ret;
}
private static String getHeaders(Workbook wb) throws Exception {
StringBuffer sb = new StringBuffer("[");
int sheetNum = wb.getNumberOfSheets();
if (sheetNum > 0) {
Sheet childSheet = wb.getSheetAt(0);
int rowNum = childSheet.getLastRowNum();
if (rowNum > 0) {
Row headerRow = childSheet.getRow(0); // 目前默认第0行为header
int cellNum = headerRow.getLastCellNum();
for (int k = 0; k < cellNum; k++) {
if (k != 0) sb.append(",");
sb.append("\"").append(headerRow.getCell(k).toString()).append("\"");
}
}
}
sb.append("]");
return sb.toString();
}
2、写文件，如果说读文件还差别不大的话，那么写文件就差得比较多了，特别是对单元格颜色的处理改得更加合理了，2003中用模板的形式真的很恶心
，至于合并单元格，虽然类名不同了，但逻辑还是一致的。
public static Workbook exp(String xml,String pathToSaveFolder,int type) throws IOException, DocumentException {
XmlToObj t = new XmlToObj();
ObjForExpImp[] objForExpImps = t.readFromXml(xml);
Workbook wb = new XSSFWorkbook();
CreationHelper createHelper = wb.getCreationHelper();
Sheet sheet = wb.createSheet("第一页");
int i;
for (ObjForExpImp objForExpImp : objForExpImps) {
i = topToRow((int) objForExpImp.getTop());
// create the table head
Row row = sheet.createRow(i);
int cellstart = leftToCell((int) objForExpImp.getLeft());
Cell hcell = row.createCell(cellstart);
RichTextString richTextString = createHelper.createRichTextString(
objForExpImp.getTitle());
richTextString.applyFont(createFont(wb, objForExpImp.getFont(),
objForExpImp.getFontsize(), true, objForExpImp
.getFontstyle(), objForExpImp.getFontweight()));
// hcell.setEncoding(HSSFCell.ENCODING_UTF_16);
hcell.setCellStyle(getStyle(wb, 1, objForExpImp.getPosition(), null));
hcell.setCellValue(richTextString);
merged(sheet, i, cellstart, i, cellstart
+ objForExpImp.getCellSlength(), getStyle(wb, 1,
objForExpImp.getPosition(), null));
// create the table body
RowForExp[] rowForExps = objForExpImp.getRowForExps();
i++;
Font bodyFont = createFont(wb, objForExpImp.getFont(),
objForExpImp.getFontsize(), false, objForExpImp
.getFontstyle(), objForExpImp.getFontweight());
// LastRowSpan lastRowSpan = new LastRowSpan();
for (RowForExp rowForExp : rowForExps) {
CellForExp[] cellForExps = rowForExp.getCellForExps();
row = sheet.createRow(i);
int j = leftToCell((int) objForExpImp.getLeft());
CellStyle cs = wb.createCellStyle();
for (CellForExp cellForExp : cellForExps) {
if(0==cellForExp.getColspan()){ //colspan为0的不生成cell.
j++;
continue;
}
Cell cell = row.createCell(j);
CellStyle cellStyle = getStyle(wb, cellForExp
.getRowspan(), cellForExp.getAlign(),cellForExp.getColor());
if (cellForExp.getColspan() > 1
|| cellForExp.getRowspan() > 1) {
int endcolspan = j + cellForExp.getColspan() - 1;
merged(sheet, i, j, i + cellForExp.getRowspan() - 1,
endcolspan, cellStyle);
}
j++;
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
RichTextString richString = createHelper.createRichTextString(
cellForExp.getData());
richString.applyFont(bodyFont);
cell.setCellValue(richString);
cell.setCellStyle(cellStyle);
}
i++;
}
ImageForExp[] imageForExps = objForExpImp.getImageForExps();
for (ImageForExp imageForExp : imageForExps) {
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
BufferedImage bufferImg = ImageIO.read(new File(
pathToSaveFolder + File.separator
+ imageForExp.getName()));
ImageIO.write(bufferImg, "jpg", byteArrayOut);
Drawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = new XSSFClientAnchor(
0,
0,
1023,
255,
(short) leftToCell(imageForExp.getLeft()),
topToRow(imageForExp.getTop()),
(short) (lengthToCell(imageForExp.getLength()) + leftToCell(imageForExp
.getLeft())), topToRow(imageForExp.getTop())
+ (short) height2Row(imageForExp.getHeight()));
drawing.createPicture(anchor, wb.addPicture(byteArrayOut
.toByteArray(), XSSFWorkbook.PICTURE_TYPE_JPEG));
}
}
return wb;
}
private static CellStyle getStyle(Workbook wb, int rowspan,
int align, String color) {
XSSFCellStyle cs = (XSSFCellStyle)wb.createCellStyle();
if (rowspan > 1)
cs.setVerticalAlignment(HSSFCellStyle.VERTICAL_TOP);
cs.setAlignment(getAlignment(align));
cs.setBorderBottom(HSSFCellStyle.BORDER_THIN);
cs.setBottomBorderColor(HSSFColor.BLACK.index);
cs.setBorderLeft(HSSFCellStyle.BORDER_THIN);
cs.setLeftBorderColor(HSSFColor.BLACK.index);
cs.setBorderRight(HSSFCellStyle.BORDER_THIN);
cs.setRightBorderColor(HSSFColor.BLACK.index);
cs.setBorderTop(HSSFCellStyle.BORDER_THIN);
cs.setTopBorderColor(HSSFColor.BLACK.index);
int[] rbg = Utils.hex2rbg(StringUtils.isBlank(color)?"#ffffff":color);
cs.setFillForegroundColor(new XSSFColor(new Color(rbg[0],rbg[1],rbg[2])));
cs.setFillPattern(CellStyle.SOLID_FOREGROUND);
return cs;
}
private static void merged(Sheet sheet, int startRow, int startCell,
int endRow, int endCell, CellStyle cs) {
CellRangeAddress cellRangeAddress = new CellRangeAddress(startRow,endRow, (short) startCell,
(short) endCell);
sheet.addMergedRegion(cellRangeAddress);
setRegionStyle(sheet, cellRangeAddress, cs);
}
private static void setRegionStyle(Sheet sheet, CellRangeAddress cellRangeAddress,
CellStyle cs) {
for (int i = cellRangeAddress.getFirstRow(); i <= cellRangeAddress.getLastRow(); i++) {
Row row = CellUtil.getRow(i, sheet);
for (int j = cellRangeAddress.getFirstColumn(); j <= cellRangeAddress.getLastColumn(); j++) {
Cell cell = CellUtil.getCell(row, (short) j);
cell.setCellStyle(cs);
}
}
}
好了，代码就贴这么多了，在excel2003是如何渲染背景色、合并单元格、添加图表在这里就不多做说明了，相信网上资料也不少了。