java—读取Excel 、导出Excel

后台代码：

import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.Colour;
import jxl.format.UnderlineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WriteException;


public class ExcelUtil {
	/**
	 * 返回大标题格式
	 */
	public static WritableCellFormat createWcfTitle() {
		Workbook rwb=null;
		try {
                         //读取Excel文件
                        FileInputStream is = new FileInputStream("C:\\8.8.xls");
			 rwb=Workbook.getWorkbook(is);
		} catch (Exception e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
		Sheet rs=rwb.getSheet(0);
	
		//获取第一行 ，第一列的值
		Cell c00=rs.getCell(0,0);
		
		String strc00= c00.getContents();
		
		//获取第一行，第二列的值
		
		Cell c10=rs.getCell(1,0);
		String strc10=c10.getContents();
		
		//获取第二行，第一列的值
		Cell c01=rs.getCell(0,1);
		String strc01=c01.getContents();
		
		
		
		//获取第二行，第一列的值
		Cell c11=rs.getCell(1,1);
		String strc11=c11.getContents();
		
               //获取时间 strc41=08:30
		Cell c41=rs.getCell(4,1);
		String strc41=c41.getContents();
		//获取时间 strc51=18:20
		Cell c51=rs.getCell(5,1);
		String strc51=c51.getContents();
		
		try{

                 //计算时间差
                 SimpleDateFormat df = new SimpleDateFormat("HH:mm");
		 System.out.println(strc41);
		 System.out.println(strc51);
		   java.util.Date now = df.parse(strc51);
		   java.util.Date date=df.parse(strc41);
		   long l=now.getTime()-date.getTime();
		   System.out.println(l);
		   long day=l/(24*60*60*1000);
		   long hour=(l/(60*60*1000)-day*24);
		   long min=((l/(60*1000))-day*24*60-hour*60);
		   long s=(l/1000-day*24*60*60-hour*60*60-min*60);
		   System.out.println(day);
		   System.out.println(hour);
		   System.out.println(min);
		   System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒");
		   
		
		}
		catch(Exception ex){
			ex.printStackTrace();
		}
		
		
		
		WritableFont wfc_big = new WritableFont(WritableFont.ARIAL, 12, WritableFont.BOLD, false,
				UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
		WritableCellFormat wcf_title = new WritableCellFormat(wfc_big);
		try {
			wcf_title.setBorder(Border.ALL, BorderLineStyle.THIN);
			wcf_title.setAlignment(Alignment.CENTRE);
			wcf_title.setVerticalAlignment(VerticalAlignment.CENTRE);
			wcf_title.setWrap(true);

		} catch (WriteException e) {
			e.printStackTrace();
		}
		return wcf_title;
	}
	
	
	/**
	 * 返回正文格式
	 */
	public static WritableCellFormat createWcfText() {
		WritableFont wfc_small = new WritableFont(WritableFont.ARIAL, 12, WritableFont.NO_BOLD, false,
				UnderlineStyle.NO_UNDERLINE, Colour.BLACK);
		WritableCellFormat wcf_text = new WritableCellFormat(wfc_small);
		try {
			wcf_text.setBorder(Border.ALL, BorderLineStyle.THIN);
			wcf_text.setAlignment(Alignment.LEFT);
			wcf_text.setVerticalAlignment(VerticalAlignment.CENTRE);
		} catch (WriteException e) {
			e.printStackTrace();
		}
		return wcf_text;
	}
}

前台代码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<%@page import="jxl.write.*"%>
<%@page import="jxl.Workbook"%>
<%@page import="com.ying.ExcelUtil"%>

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'exportExcel.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <%
	response.reset();
	response.setContentType("application/vnd.ms-excel;charset=UTF-8");
	response.setHeader("Content-Disposition", "attachment;filename=" + new String("Excel文件.xls".getBytes("utf-8"), "iso8859-1"));

	OutputStream os = response.getOutputStream();

	WritableWorkbook wwb = null;
	WritableCellFormat wcf_title = ExcelUtil.createWcfTitle();
	WritableCellFormat wcf_text = ExcelUtil.createWcfText();
	wwb = Workbook.createWorkbook(os);//将 WritableWorkbook 写入到输出流
	WritableSheet ws = wwb.createSheet("sheet1", 0);//创建第一个sheet
	ws.mergeCells(0, 0, 3, 0);//合并单元格
	
	

	Label lbl = null;
	lbl = new Label(0, 0, "大标题" , wcf_title);
	ws.addCell(lbl);

	lbl = new Label(0, 1, "列标题1", wcf_text);
	ws.addCell(lbl);
	lbl = new Label(1, 1, "列标题2", wcf_text);
	ws.addCell(lbl);
	lbl = new Label(2, 1, "列标题3", wcf_text);
	ws.addCell(lbl);
	lbl = new Label(3, 1, "列标题4", wcf_text);
	ws.addCell(lbl);

	for (int i = 0; i < 3; i++) //设置宽度
		ws.setColumnView(i, 15);

	os.flush();
	wwb.write();
	wwb.close();
	os.close();
	
       //解决异常java.lang.IllegalStateException: getOutputStream() has already been called for this response
	out.clear();
        out = pageContext.pushBody(); 
%>
  </body>
</html>

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java—读取Excel 、导出Excel

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