使用JXL.JAR包,只能转换2007以前的EXCEL文件,代码如下:

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;

public class ExcelToXML_JXL_2003 {
	public static void main(String[] args) throws Exception{
		Excel_2003();
	}
	
	public static void Excel_2003() throws Exception{
		// 这里是生成工作簿
		Workbook wb = null;
		// 创建根节点;
		Element root = new Element("sheet");
		// 将根节点添加到文档中;
		Document Doc = new Document(root);
		InputStream instream = new FileInputStream("d:/AAA.xls");
		wb = Workbook.getWorkbook(instream);
		// 获取第一张Sheet表
		Sheet sheet = wb.getSheet(0);
		// 获取Sheet表中所包含的总列数
		int columns = sheet.getColumns();
		// 获取Sheet表中所包含的总行数
		int rows = sheet.getRows();
		// 获取指定单元格的对象引用
		for (int i = 0; i < rows; i++) {
			Element elements = new Element("tr");
			for (int j = 0; j < columns; j++) {
				Cell cell = sheet.getCell(j, i);
				// str[i][j]=cell.getContents();//在此创建一个二维数组,获取单元格的数据
				// 生成xml文件
				elements.addContent(new Element("cell").setText(cell.getContents())); // 填写单元格的数据。
				root.addContent(elements.detach());
			}
		}
		Format format = Format.getPrettyFormat();
		XMLOutputter XMLOut = new XMLOutputter(format);
		XMLOut.output(Doc, new FileOutputStream("d:/books_xls.xml"));
		System.out.println("Excel转换成XML成功!");
	}
}



使用poi.jar,相关的包:

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;


public class ExcelToXML_POI_2007 {

	/**
	 * 读取Excel文档
	 * @param filePath
	 * @throws Exception
	 */
	public static void read(String filePath) throws Exception {
		String fileType = filePath.substring(filePath.lastIndexOf(".") + 1, filePath.length());
		InputStream stream = new FileInputStream(filePath);
		Workbook wb = null;
		if (fileType.equals("xls")) {
			wb = new HSSFWorkbook(stream);
		} else if (fileType.equals("xlsx")) {
			wb = new XSSFWorkbook(stream);
		} else {
			System.out.println("您输入的excel格式不正确");
		}
		Sheet sheet1 = wb.getSheetAt(0);
		for (Row row : sheet1) {
			for (Cell cell : row) {
				System.out.print(cell.getStringCellValue() + "  ");
			}
			System.out.println();
		}
	}

	/**
	 * 生成Excel文档
	 * @param outPath
	 * @return
	 * @throws Exception
	 */
	public static boolean write(String outPath) throws Exception {
		String fileType = outPath.substring(outPath.lastIndexOf(".") + 1, outPath.length());
		System.out.println(fileType);
		// 创建工作文档对象
		Workbook wb = null;
		if (fileType.equals("xls")) {
			wb = new HSSFWorkbook();
		} else if (fileType.equals("xlsx")) {
			wb = new XSSFWorkbook();
		} else {
			System.out.println("您的文档格式不正确!");
			return false;
		}
		// 创建sheet对象
		Sheet sheet1 = (Sheet) wb.createSheet("sheet1");
		// 循环写入行数据
		for (int i = 0; i < 5; i++) {
			Row row = (Row) sheet1.createRow(i);
			// 循环写入列数据
			for (int j = 0; j < 8; j++) {
				Cell cell = row.createCell(j);
				cell.setCellValue("测试" + j);
			}
		}
		// 创建文件流
		OutputStream stream = new FileOutputStream(outPath);
		// 写入数据
		wb.write(stream);
		// 关闭文件流
		stream.close();
		return true;
	}

	/**
	 * Excel转换成XML
	 * @param wb
	 * @throws Exception
	 */
	private static void excelToXML(String filePath) throws Exception {
		String fileType = filePath.substring(filePath.lastIndexOf(".") + 1, filePath.length());
		InputStream stream = new FileInputStream(filePath);
		Workbook wb = null;
		if (fileType.equals("xls")) {
			wb = new HSSFWorkbook(stream);
		} else if (fileType.equals("xlsx")) {
			wb = new XSSFWorkbook(stream);
		} else {
			System.out.println("您输入的excel格式不正确");
		}
		// 创建根节点;
		Element root = new Element("sheet");
		// 将根节点添加到文档中;
		Document Doc = new Document(root);
		Sheet sheet1 = wb.getSheetAt(0);
		for (Row row : sheet1) {
			Element elements = new Element("tr");
			for (Cell cell : row) {
//				System.out.print(cell.getStringCellValue() + "  ");
				elements.addContent(new Element("cell").setText(cell.getStringCellValue())); // 填写单元格的数据。
				root.addContent(elements.detach());
			}
			Format format = Format.getPrettyFormat();
			XMLOutputter XMLOut = new XMLOutputter(format);
			XMLOut.output(Doc, new FileOutputStream("d:/books_xls.xml"));
			System.out.println();
		}
	}

	public static void main(String[] args) {
		try {
			ExcelToXML_POI_2007.excelToXML("d:/AAA.xlsx");
//			ExcelToXML2.write("D:" + File.separator + "out.xlsx");
//			ExcelToXML2.read("D:" + File.separator + "out.xlsx");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}




另一种写法:

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.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;

/**
 * 
 * @描述:测试excel读取
 * 导入的jar包
 * poi-3.8-beta3-20110606.jar
 * poi-ooxml-3.8-beta3-20110606.jar
 * poi-examples-3.8-beta3-20110606.jar
 * poi-excelant-3.8-beta3-20110606.jar
 * poi-ooxml-schemas-3.8-beta3-20110606.jar
 * poi-scratchpad-3.8-beta3-20110606.jar
 * xmlbeans-2.3.0.jar
 * dom4j-1.6.1.jar
 * jar包官网下载地址:http://poi.apache.org/download.html
 * 下载poi-bin-3.8-beta3-20110606.zipp
 */

public class ExeclToXML {
	/** 总行数 */
	private int totalRows = 0;
	
	/** 总列数 */
	private int totalCells = 0;

	/** 错误信息 */
	private String errorInfo;

	/** 构造方法 */
	public ExeclToXML() {}

	/**
	 * @描述:得到总行数
	 */
	public int getTotalRows() {
		return totalRows;
	}

	/**
	 * @描述:得到总列数
	 */

	public int getTotalCells() {
		return totalCells;
	}

	/**
	 * @描述:得到错误信息
	 */
	public String getErrorInfo() {
		return errorInfo;
	}

	/**
	 * @描述:是否是2003的excel,返回true是2003
	 */
	public static boolean isExcel2003(String filePath) {
		return filePath.matches("^.+\\.(?i)(xls)$");
	}

	/**
	 * @描述:是否是2007的excel,返回true是2007
	 */
	public static boolean isExcel2007(String filePath) {
		return filePath.matches("^.+\\.(?i)(xlsx)$");
	}
	
	/**
	 * @描述:验证excel文件
	 */
	public boolean validateExcel(String filePath) {
		/** 检查文件名是否为空或者是否是Excel格式的文件 */
		if (filePath == null || !(isExcel2003(filePath) || isExcel2007(filePath))) {
			errorInfo = "文件名不是excel格式";
			return false;
		}

		/** 检查文件是否存在 */
		File file = new File(filePath);
		if (file == null || !file.exists()) {
			errorInfo = "文件不存在";
			return false;
		}
		return true;

	}

	/**
	 * @描述:根据文件名读取excel文件
	 */
	public List<List<String>> read(String filePath) {
		List<List<String>> dataLst = new ArrayList<List<String>>();
		InputStream is = null;
		try {
			/** 验证文件是否合法 */
			if (!validateExcel(filePath)) {
				System.out.println(errorInfo);
				return null;
			}
			
			/** 判断文件的类型,是2003还是2007 */
			boolean isExcel2003 = true;
			if (isExcel2007(filePath)) {
				isExcel2003 = false;
			}

			/** 调用本类提供的根据流读取的方法 */
			File file = new File(filePath);
			is = new FileInputStream(file);
			dataLst = read(is, isExcel2003);
			is.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					is = null;
					e.printStackTrace();
				}
			}
		}
		/** 返回最后读取的结果 */
		return dataLst;
	}

	/**
	 * @throws Exception 
	 * @描述:根据流读取Excel文件
	 */
	public List<List<String>> read(InputStream inputStream, boolean isExcel2003) throws Exception {
		List<List<String>> dataLst = null;
		try {
			/** 根据版本选择创建Workbook的方式 */
			Workbook wb = null;
			if (isExcel2003) {
				wb = new HSSFWorkbook(inputStream);
			} else {
				wb = new XSSFWorkbook(inputStream);
			}
			dataLst = read(wb);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return dataLst;
	}

	/**
	 * @throws IOException 
	 * @throws FileNotFoundException 
	 * @描述:读取数据
	 */
	private List<List<String>> read(Workbook wb) throws Exception {
		List<List<String>> dataLst = new ArrayList<List<String>>();
		
		/** 得到第一个shell */
		Sheet sheet = wb.getSheetAt(0);

		/** 得到Excel的行数 */
		this.totalRows = sheet.getPhysicalNumberOfRows();

		/** 得到Excel的列数 */
		if (this.totalRows >= 1 && sheet.getRow(0) != null) {
			this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
		}

		/** 循环Excel的行 */
		for (int r = 0; r < this.totalRows; r++) {
			Row row = sheet.getRow(r);
			if (row == null) {
				continue;
			}
			List<String> rowLst = new ArrayList<String>();
			/** 循环Excel的列 */
			for (int c = 0; c < this.getTotalCells(); c++) {
				Cell cell = row.getCell(c);
				String cellValue = "";
				if (null != cell) {
					// 以下是判断数据的类型
					switch (cell.getCellType()) {
					case HSSFCell.CELL_TYPE_NUMERIC: // 数字
						cellValue = cell.getNumericCellValue() + "";
						break;
					case HSSFCell.CELL_TYPE_STRING: // 字符串
						cellValue = cell.getStringCellValue();
						break;
					case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
						cellValue = cell.getBooleanCellValue() + "";
						break;
					case HSSFCell.CELL_TYPE_FORMULA: // 公式
						cellValue = cell.getCellFormula() + "";
						break;
					case HSSFCell.CELL_TYPE_BLANK: // 空值
						cellValue = "";
						break;
					case HSSFCell.CELL_TYPE_ERROR: // 故障
						cellValue = "非法字符";
						break;
					default:
						cellValue = "未知类型";
						break;
					}
				}
				rowLst.add(cellValue);
			}
			/** 保存第r行的第c列 */
			dataLst.add(rowLst);
		}
		
		/**Excel转换成XML*/
		this.excelToXML(sheet);
		
		return dataLst;
	}

	/***
	 * Excel转换成XML
	 * @param sheet
	 */
	private void excelToXML(Sheet sheet) throws Exception {
		// 创建根节点;
		Element root = new Element("sheet");
		// 将根节点添加到文档中;
		Document Doc = new Document(root);

		// 获取指定单元格的对象引用
		for (Row row : sheet) {
			Element elements = new Element("tr");
			for (Cell cell : row) {
				elements.addContent(new Element("cell").setText(cell.getStringCellValue())); // 填写单元格的数据。
				root.addContent(elements.detach());
			}
		}
		Format format = Format.getPrettyFormat();
		XMLOutputter XMLOut = new XMLOutputter(format);
		XMLOut.output(Doc, new FileOutputStream("d:/books_xls.xml"));
//		System.out.println("Excel转换成XML成功!");
	}

	/**
	 * @描述:main测试方法
	 */
	public static void main(String[] args) throws Exception {
		ExeclToXML poi = new ExeclToXML();
//		List<List<String>> list = poi.read("d:/AAA.xls");
		List<List<String>> list = poi.read("d:/AAA.xlsx");
		
//		if (list != null) {
//			for (int i = 0; i < list.size(); i++) {
//				System.out.print("第" + (i+1) + "行");
//				List<String> cellList = list.get(i);
//				for (int j = 0; j < cellList.size(); j++) {
//					System.out.print("    第" + (j + 1) + "列值:");
//					System.out.print("    " + cellList.get(j));
//				}
//				System.out.println();
//			}
//		}
	}
}