后台处理excel下载输出流

前台

<ul class="navtop-right">
	<li >
　　　　　　　　<a href="/portal/trip/importExec" title="Data Download">
	      <img src="${pageContext.request.contextPath}/style/images/excel6.jpg"   width=20px height=20px style="padding-top:15px"/>
	     </a>
	</li>
 </ul>

后台

HSSFRow row = sheet.createRow(0);： 创建第0行

HSSFCell c2 = row.createCell(2); 创建0行2列

HSSFCell c3 = row.createCell(4）； 说明2列占了2列

sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)0, (short)0)); 说明 合并单元格， 0行，1行合并成一行

@RequestMapping(value = "importExec", method = RequestMethod.GET)
	@ResponseBody
	public void importExec(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException {
		String fname = "Biztrip list";
		response.reset();// 清空输出流
		response.setHeader("Content-disposition","attachment; filename=" + fname + ".xls");// 设定输出文件头
		response.setContentType("application/msexcel");//EXCEL格式  Microsoft excel
		//创建workbook
        HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFCellStyle style = workbook.createCellStyle();
	    style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
	    HSSFFont f  = workbook.createFont();
	   // f.setColor(HSSFColor.RED.index);
	    f.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);//加粗
	    style.setFont(f);
	    style.setFillForegroundColor(HSSFColor.LIME.index);
	    style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        //创建sheet页
        HSSFSheet sheet = workbook.createSheet("Business Trip Info.");
        //创建单元格
        HSSFRow row = sheet.createRow(0);
        HSSFCell c0 = row.createCell(0);
        c0.setCellValue(new HSSFRichTextString("No"));
        c0.setCellStyle(style);  

        HSSFCell c1 = row.createCell(1);
        c1.setCellValue(new HSSFRichTextString("Name"));
        c1.setCellStyle(style);  

        HSSFCell c2 = row.createCell(2);
        c2.setCellValue(new HSSFRichTextString("Part"));
        c2.setCellStyle(style);  

        HSSFCell c3 = row.createCell(4);
        c3.setCellValue(new HSSFRichTextString("Purpose"));
        c3.setCellStyle(style);  

        HSSFCell c4 = row.createCell(5);
        c4.setCellValue(new HSSFRichTextString("Schedule"));
        c4.setCellStyle(style);  

        HSSFCell c5 = row.createCell(8);
        c5.setCellValue(new HSSFRichTextString("Destination"));
        c5.setCellStyle(style);  

        HSSFCell c6 = row.createCell(11);
        c6.setCellValue(new HSSFRichTextString("Report"));
        c6.setCellStyle(style);
        HSSFCell c7 = row.createCell(12);
        c7.setCellValue(new HSSFRichTextString("Ref."));
        c7.setCellStyle(style); 

        HSSFRow row1 = sheet.createRow(1);   

        HSSFCell c8 = row1.createCell(5);
        c8.setCellValue(new HSSFRichTextString("Start"));
        c8.setCellStyle(style);
        HSSFCell c9 = row1.createCell(6);
        c9.setCellValue(new HSSFRichTextString("End"));
        c9.setCellStyle(style);
        HSSFCell c10 = row1.createCell(7);
        c10.setCellValue(new HSSFRichTextString("Days"));
        c10.setCellStyle(style);
        HSSFCell c11 = row1.createCell(8);
        c11.setCellValue(new HSSFRichTextString("Country"));
        c11.setCellStyle(style);
        HSSFCell c12 = row1.createCell(9);
        c12.setCellValue(new HSSFRichTextString("Region"));
        c12.setCellStyle(style);
        HSSFCell c13 = row1.createCell(10);
        c13.setCellValue(new HSSFRichTextString("Dept."));
        c13.setCellStyle(style);  

        sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)0,  (short)0));
        sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)1,  (short)1));
        sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)2,  (short)3));
        sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)4,  (short)4));
        sheet.addMergedRegion(new CellRangeAddress(0, 0,(short)5,  (short)7));
        sheet.addMergedRegion(new CellRangeAddress(0, 0,(short)8,  (short)10));
        sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)11,  (short)11));
        sheet.addMergedRegion(new CellRangeAddress(0, 1,(short)12,  (short)12));

        List<Trip> tripList =  tripService.findAll();
        for(int i=0;i<tripList.size();i++){
        	row=sheet.createRow((int)i+2);
        	Trip trip = (Trip)tripList.get(i);
        	row.createCell((short)0).setCellValue(new HSSFRichTextString(i+1+""));
        	row.createCell((short)1).setCellValue(new HSSFRichTextString(trip.getName()));
        	row.createCell((short)2).setCellValue(new HSSFRichTextString(trip.getPart()));
        	row.createCell((short)3).setCellValue(new HSSFRichTextString(trip.getSubPart()));
        	row.createCell((short)4).setCellValue(new HSSFRichTextString(trip.getPurpose()));
        	row.createCell((short)5).setCellValue(new HSSFRichTextString(trip.getScheduleStart()));
        	row.createCell((short)6).setCellValue(new HSSFRichTextString(trip.getScheduleEnd()));
        	row.createCell((short)7).setCellValue(new HSSFRichTextString(trip.getDuration()));
        	row.createCell((short)8).setCellValue(new HSSFRichTextString(trip.getDestination()));
        	row.createCell((short)9).setCellValue(new HSSFRichTextString(trip.getRegion()));
        	row.createCell((short)10).setCellValue(new HSSFRichTextString(trip.getDepartment()));
        	row.createCell((short)11).setCellValue(new HSSFRichTextString(trip.getReport()));
        	row.createCell((short)12).setCellValue(new HSSFRichTextString(trip.getReferrence()));
        }

        try{
	          workbook.write(response.getOutputStream());
	    }
	    catch (Exception e){
	        e.printStackTrace();
	    }
	}