java项目中Excel文件预览

 package com.linkonworks.df.busi.utils;

 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.StringWriter;

 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.OutputKeys;
 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;

 import org.apache.poi.hssf.converter.ExcelToHtmlConverter;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;

 /**
  * <p>
  * @ClassName: FilePreview
  * </p>
  * <p>
  * Description: Excel文件转为html元素
  * </p>
  *
  * @author 周宣
  * @date 2015年12月21日
  */
 public class FilePreview {
     /**
      * <p>
      * Title: convertExceltoHtml
      * </p>
      * <p>
      * Description: 将2003版Excel文件转为html标签元素
      * </p>
      *
      * @author 周宣
      * @param excelFile
      * @return
      * @throws IOException
      * @throws ParserConfigurationException
      * @throws TransformerException
      * @throws InvalidFormatException
      */
     public static String convertExceltoHtml(String path) throws IOException,ParserConfigurationException, TransformerException,InvalidFormatException {
         HSSFWorkbook workBook = null;
         String content = null;
         StringWriter writer = null;
         File excelFile = new File(path);
         InputStream is = new FileInputStream(excelFile);;
         //判断Excel文件是2003版还是2007版
         String suffix = path.substring(path.lastIndexOf("."));
         if(suffix.equals(".xlsx")){
             //将07版转化为03版
             Xssf2Hssf xlsx2xls = new Xssf2Hssf();
             XSSFWorkbook xSSFWorkbook = new XSSFWorkbook(is);
             workBook = new HSSFWorkbook();
             xlsx2xls.transformXSSF(xSSFWorkbook, workBook);

         }else{
             workBook = new HSSFWorkbook(is);
         }
         try {
             ExcelToHtmlConverter converter = new ExcelToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());
             converter.setOutputColumnHeaders(false);// 不显示列的表头
             converter.setOutputRowNumbers(false);// 不显示行的表头
             converter.processWorkbook(workBook);

             writer = new StringWriter();
             Transformer serializer = TransformerFactory.newInstance().newTransformer();
             serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
             serializer.setOutputProperty(OutputKeys.INDENT, "yes");
             serializer.setOutputProperty(OutputKeys.METHOD, "html");
             serializer.transform(new DOMSource(converter.getDocument()),
                     new StreamResult(writer));

             content = writer.toString();
             writer.close();
         } finally {
             try {
                 if (is != null) {
                     is.close();
                 }
                 if (writer != null) {
                     writer.close();
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
         return content;
     }

 }