if (cell == null) {       item.setText("");       e.addContent(item);       cellNum++;//如果存在空列，那么cellNum增加1，这一步很重要。       continue;}

package edu.sjtu.erplab.jdom;

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.text.SimpleDateFormat;import java.util.Date;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFDateUtil;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.jdom.Document;import org.jdom.Element;import org.jdom.output.Format;import org.jdom.output.XMLOutputter;

/** * 操作Excel表格的功能类*/public class ExcelReaderXMLWriter2 {

public static void main(String[] args) {try {            InputStream stream = new FileInputStream("d:\\userinfo2.xls");            File f = new File("D:\\temp5.xml");// 新建个file对象把解析之后得到的xml存入改文件中            writerXML(stream, f);// 将数据以xml形式写入文本        } catch (FileNotFoundException e) {            System.out.println("未找到指定路径的文件!");            e.printStackTrace();        } catch (IOException e) {// TODO Auto-generated catch block            e.printStackTrace();        }    }

private static void writerXML(InputStream stream, File f)throws IOException {        FileOutputStream fo = new FileOutputStream(f);// 得到输入流        Document doc = readExcell(stream);// 读取EXCEL函数        Format format = Format.getCompactFormat().setEncoding("gb2312")                .setIndent("");        XMLOutputter XMLOut = new XMLOutputter(format);// 在元素后换行，每一层元素缩排四格        XMLOut.output(doc, fo);        fo.close();    }

private static Document readExcell(InputStream stream) {        Element root = new Element("list");        Document doc = new Document(root);try {            HSSFWorkbook wb = new HSSFWorkbook(stream);int WbLength = wb.getNumberOfSheets();for (int i = 0; i < WbLength; i++) {                HSSFSheet shee = wb.getSheetAt(i);int length = shee.getLastRowNum();                System.out.println("行数：" + length);for (int j = 1; j <= length; j++) {                    HSSFRow row = shee.getRow(j);if (row == null) {continue;                    }int cellNum = row.getPhysicalNumberOfCells();// 获取一行中最后一个单元格的位置                    System.out.println("列数cellNum：" + cellNum);// int cellNum =16;                    Element e = null;                    e = new Element("USER");// Element[] es = new Element[16];                    for (int k = 0; k < cellNum; k++) {                        HSSFCell cell = row.getCell((short) k);                        String temp = get(k);                        System.out.print(k+"    "+temp+":");                        Element item = new Element(temp);if (cell == null) {                            item.setText("");                            e.addContent(item);                            cellNum++;//如果存在空列，那么cellNum增加1，这一步很重要。                            continue;                        }

else {                            String cellvalue = "";switch (cell.getCellType()) {// 如果当前Cell的Type为NUMERIC                            case HSSFCell.CELL_TYPE_NUMERIC:case HSSFCell.CELL_TYPE_FORMULA: {// 判断当前的cell是否为Date                                if (HSSFDateUtil.isCellDateFormatted(cell)) {// 如果是Date类型则，转化为Data格式

// 方法1：这样子的data格式是带时分秒的：2011-10-12 0:00:00// cellvalue =                                    cell.getDateCellValue().toLocaleString();

// 方法2：这样子的data格式是不带带时分秒的：2011-10-12                                    Date date = cell.getDateCellValue();                                    SimpleDateFormat sdf = new SimpleDateFormat(                                            "yyyy-MM-dd");                                    cellvalue = sdf.format(date);                                    item.setText(cellvalue);

                                }// 如果是纯数字                                else {// 取得当前Cell的数值                                    cellvalue = String.valueOf((int)cell.getNumericCellValue());                                    item.setText(cellvalue);                                }break;                            }// 如果当前Cell的Type为STRIN                            case HSSFCell.CELL_TYPE_STRING:// 取得当前的Cell字符串                                cellvalue = cell.getRichStringCellValue()                                        .getString();                                item.setText(cellvalue);break;// 默认的Cell值                            default:                                cellvalue = " ";                                item.setText(cellvalue);                            }                            e.addContent(item);                            System.out.println(cellvalue);                        }                    }                    root.addContent(e);

                }

            }        } catch (Exception e) {

        }try {            stream.close();        } catch (IOException e) {

        }return doc;    }

private static String get(int k) {        String test = "";switch (k) {case 0:            test = "USERNAME";break;case 1:            test = "PASSWORD";break;case 2:            test = "SEX";break;case 3:            test = "AGE";break;case 4:            test = "BIRTHDAY";break;default:        }return test;

    }

}