《JAVA》编程中怎么用SXSSFWorkbook对已存在的excel操作进行写数据操作
网上找了半天只找到对已经存在的excel2003格式文件的内容追加的方式，如下：
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.hssf.model.Workbook;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
public class Test11 {
public static void main(String[] args) throws Exception {
FileInputStream fs=new FileInputStream("d://test.xls");
POIFSFileSystem ps=new POIFSFileSystem(fs);
HSSFWorkbook wb=new HSSFWorkbook(ps);
HSSFSheet sheet=wb.getSheetAt(0);
HSSFRow row=sheet.getRow(0);
System.out.println(sheet.getLastRowNum()+" "+row.getLastCellNum());
FileOutputStream out=new FileOutputStream("d://workbook.xls");
row=sheet.createRow((short)(sheet.getLastRowNum()+1));
row.createCell(17).setCellValue(9.2);
row.createCell(20).setCellValue(9);
out.flush();
wb.write(out);
out.close();
System.out.println(row.getPhysicalNumberOfCells()+" "+row.getLastCellNum());
}
}
但是对于excel2007的操作需要用XSSF，我照葫芦画瓢，发现不行呢。
像 HSSFWorkbook wb=new HSSFWorkbook(ps); 直接换成是 XSSFWorkbook wb=new XSSFWorkbook(ps); 提示是错误的。 展开
XSSFWorkbook wb=new XSSFWorkbook(参数);中的参数是InputStream ，你直接XSSFWorkbook wb=new XSSFWorkbook(fs);就可以了。
第一步查询数据--这一步读者自行实现自己的数据查询 List<PointInfo> points = null;
points = this.dao.getAllCollect(userId);
final Map<String, List<PointInfo>> pointMap = new HashMap<>();
for (final PointInfo pointInfo : points) {
final String pt = pointInfo.getPointType(); if (pointMap.containsKey(pt)) {final List<PointInfo> subList = pointMap.get(pt);
subList.add(pointInfo);
} else {final List<PointInfo> subList = new ArrayList<>();subList.add(pointInfo);
pointMap.put(pt, subList
第二步：生成工作簿
final SXSSFWorkbook wb = new SXSSFWorkbook();
// 对每一种类型生成一个sheet
for (final Map.Entry<String, List<PointInfo>> entry : pointMap.entrySet()) {
final List<PointInfo> pts = entry.getValue();
// 获取每种类型的名字--作为sheet显示名称--如果不需要分sheet可忽略
String typeName = "";
if (this.dao.getTypeByTypeCode(pts.get(0).getPointType()) != null) {
typeName = this.dao.getTypeByTypeCode(pts.get(0).getPointType()).getPointTypeName();
}
final Sheet sheet = wb.createSheet(typeName);
//生成用于插入图片的容器--这个方法返回的类型在老api中不同
final Drawing patriarch = sheet.createDrawingPatriarch();
// 为sheet1生成第一行，用于放表头信息
final Row row = sheet.createRow(0);
// 第一行的第一个单元格的值
Cell cell = row.createCell((short) 0);
cell.setCellValue("详细地址");
cell = row.createCell((short) 1);
cell.setCellValue("经度");
cell = row.createCell((short) 2);
cell.setCellValue("纬度");
cell = row.createCell((short) 3);
for (int i = 0; i < pts.size(); i++) {
final Row each = sheet.createRow(i + 1);
Cell infoCell = each.createCell((short) 0);
infoCell.setCellValue(pts.get(i).getAddrDetail());
infoCell = each.createCell((short) 1);
infoCell.setCellValue(pts.get(i).getX());
infoCell = each.createCell((short) 2);
infoCell.setCellValue(pts.get(i).getY());
infoCell = each.createCell((short) 3);
//查询获取图片路径信息--该步读者自定义
PointPic pic = this.dao.getPicInfoByPointId(pts.get(i).getId());
try {
if (pic != null) {
for (int k = 0; k < 6; k++) {//因为有六张图片，所以循环6次
final short colNum = (short) (4+k);
infoCell = each.createCell(colNum);
BufferedImage img = null;
switch (k) {
case 0:
if (!StringUtils.isEmpty(pic.getPicOneAddr())) {
File imgFile = new File(pic.getPicOneAddr());
img = ImageIO.read(imgFile);
imgFile = null;
}
break;
case 1:
if (!StringUtils.isEmpty(pic.getPicTwoAddr())) {
File imgFile = new File(pic.getPicTwoAddr());
img = ImageIO.read(imgFile);
imgFile = null;
}
break;
case 2:
if (!StringUtils.isEmpty(pic.getPicThreeAddr())) {
File imgFile = new File(pic.getPicThreeAddr());
img = ImageIO.read(imgFile);
imgFile = null;
}
break;
case 3:
if (!StringUtils.isEmpty(pic.getPicFourAddr())) {
File imgFile = new File(pic.getPicFourAddr());
img = ImageIO.read(imgFile);
imgFile = null;
}
break;
case 4:
if (!StringUtils.isEmpty(pic.getPicFiveAddr())) {
File imgFile = new File(pic.getPicFiveAddr());
img = ImageIO.read(imgFile);
imgFile = null;
}
break;
case 5:
if (!StringUtils.isEmpty(pic.getPicSixAddr())) {
File imgFile = new File(pic.getPicSixAddr());
img = ImageIO.read(imgFile);
imgFile = null;
}
break;
}
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
ImageIO.write(img, "jpg", byteArrayOut);
img = null;
//设置每张图片插入位置
final XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, colNum,
i + 1, (short) (colNum + 1), i + 2);//参数为图片插入在表格的坐标，可以自行查看api研究参数
anchor.setAnchorType(0);
// 插入图片
patriarch.createPicture(anchor, wb.addPicture(
byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
byteArrayOut.close();
byteArrayOut = null;
}
pic = null;
}
} catch (final Exception e) {
e.printStackTrace();
}
}
}
final ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
wb.write(os);
} catch (final IOException e) {
e.printStackTrace();
}
final byte[] content = os.toByteArray();
final String url = Var.BASE_URL+ File.separator + "output.xls";//读者自定义路径
final File file = new File(url);// Excel文件生成后存储的位置。
OutputStream fos = null;
try {
fos = new FileOutputStream(file);
fos.write(content);
os.close();
fos.close();
} catch (final Exception e) {
e.printStackTrace();
}
return url;//文件保存成功
