利用POI组件 导入导出excel

项目中经常遇到要将列表中的数据导出到excel中或是要将已经存在的excel文档的数据导入到数据库中。这里记录下在struts1.2中的用法。
1、从excel导入

/**
	 * 从处部excel文件中导入应急物资记录
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return
	 */
	public ActionForward importMaterials(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response){
		
		int beginRowIndex = 2;			//从excel中开始读取的起始行数
		int totalRows = 0;				//该excel表的总行数
		IUserProfile userPro = (IUserProfile) request.getSession().getAttribute(IUserProfile.SESSION_USERPROFILE_KEY);
		
		ImportFileForm importFileForm = (ImportFileForm)form;
		
		//读取要导入的文件
		FormFile file = importFileForm.getExcelfile();
		String title = file.getFileName().replaceAll(".xls", "");
		logger.debug("标题是："+title);
		try {
			//根据文件的输入流，创建对Excel工作簿文件的引用  
			HSSFWorkbook  workbook  =  new HSSFWorkbook(file.getInputStream());
			//默认excel的书页（sheet）是"Sheet1"
			HSSFSheet  sheet  =  workbook.getSheetAt(0);  
			//该excel表的总行数
			totalRows = sheet.getLastRowNum();
			logger.debug("输出总行数："+totalRows);
			
			//循环读取excel表格的每行记录，并逐行进行保存
			for(int i=beginRowIndex;i<=totalRows;i++){
				HSSFRow  row  =  sheet.getRow(i);
				//获取一行每列的数据
				HSSFCell  materialNameCell 		=  row.getCell((short)0);
				HSSFCell  amountCell  			=  row.getCell((short)1);
				HSSFCell  orgCell  				=  row.getCell((short)2);
				HSSFCell  storePlaceCell  		=  row.getCell((short)3);
				HSSFCell  buyTimeCell			=  row.getCell((short)4);
				HSSFCell  periodCell			=  row.getCell((short)5);
				HSSFCell  principalNameCell  	=  row.getCell((short)6);
				HSSFCell  principalMobileCell	=  row.getCell((short)7);
				HSSFCell  linkManCell  			=  row.getCell((short)8);
				HSSFCell  linkManMobileCell		=  row.getCell((short)9);
				
				//将列数据赋给相关变量
				String materialName = materialNameCell.getRichStringCellValue().getString();	
				String amount = amountCell.getRichStringCellValue().getString();
				String orgName = orgCell.getRichStringCellValue().getString();					String storePlace 	= storePlaceCell.getRichStringCellValue().getString();
				String buyTime 			= "";		
				if(buyTimeCell.getCellType()==HSSFCell.CELL_TYPE_NUMERIC){
					buyTime = new Double(buyTimeCell.getNumericCellValue()).toString();
				}else if(buyTimeCell.getCellType()==HSSFCell.CELL_TYPE_STRING){
					buyTime = buyTimeCell.getRichStringCellValue().getString();
				}
				String period 			= "";
				if(periodCell.getCellType()==HSSFCell.CELL_TYPE_NUMERIC){
					period = new Double(periodCell.getNumericCellValue()).toString();
				}else if(periodCell.getCellType()==HSSFCell.CELL_TYPE_STRING){
					period = periodCell.getRichStringCellValue().getString();
				}
				String principalName= principalNameCell.getRichStringCellValue().getString();
				String principalMobile= new Long((long)principalMobileCell.getNumericCellValue()).toString();
				String linkMan 			= linkManCell.getRichStringCellValue().getString();
				String linkManMobile = new Long((long)linkManMobileCell.getNumericCellValue()).toString();	
				
				//保存当前行的数据
				try{
				saveMaterial(materialName,amount,orgName,storePlace,buyTime,period,principalName,principalMobile,linkMan,linkManMobile,userPro);

				}catch(Exception e){
					throw e;
				}
			}	//for end
			MessageDisplayService.disposeMessage(request, response,"导入文件成功");
		} catch (FileNotFoundException e) {
			MessageDisplayService.disposeMessage(request, response,"找不到文件");
		} catch (IOException e) {
			MessageDisplayService.disposeMessage(request, response,"导入文件失败,连接数据库失败");	
		} catch(Exception e){
			e.printStackTrace();
			MessageDisplayService.disposeMessage(request, response,"导入文件失败,文档模板格式不正确");
		}
		return mapping.findForward("import_ok"); 
		
	}

/**
	 * 将从excel中抽取的一行物资记录转换后存入数据库
	 * @param userPro
	 */
	private void saveMaterial(String materialName,
								String amount,
								String orgName,
								String storePlace,
								String buyTime,
								String period,
								String principalName,
								String principalMobile,
								String linkMan,
								String linkManMobile,
								IUserProfile userPro) throws Exception{
		MaterialForm form = new MaterialForm();
		form.setMaterialName(materialName);		
		form.setAmount(amount);
		form.setOrgName(orgName);
		form.setStorePlace(storePlace);		
		form.setBuyTime(buyTime);			
		form.setPeriod(period);			
		form.setPrincipalName(principalName);	
		form.setPrincipalMobile(principalMobile);	
		form.setLinkman(linkMan);			
		form.setLinkmanMobile(linkManMobile);	
		//保存
		materialManager.saveOrUpdate(form, userPro);
	}

2、从数据库导出到excel中

/**
	 * 根据条件导出excel（可选择导出项）
	 * @param form
	 * @param request
	 * @param response
	 * @throws IOException
	 */
	public void exportStreetEvent(ActionForm form,HttpServletRequest request,HttpServletResponse response) throws IOException{
		
		
		HSSFWorkbook workbook = new HSSFWorkbook();
		int sheetRowNum = 0;	      
		XwzsEventQueryForm xwzsEventQueryForm = (XwzsEventQueryForm)form;
		
		/**从库中取出相关数据**/
		List list12 = xwzsEventManager.getEventQuery(xwzsEventQueryForm,projections);		
		List list = getEventExport(list12);		//将取出的列表格式化，不是必须

		String title = "事件列表";
		// 创建工作表和标题
		HSSFSheet sheet = workbook.createSheet("event");
		// 设置标题栏合并区域
		Region r = new Region(0, (short) 0, 0, (short) 12);
		ExportUtil.fillMergedRegion(workbook, sheet, r, title, workbook.createCellStyle());
		sheetRowNum++;
		// 设置列宽
		// 默认列宽
		sheet.setDefaultColumnWidth((short) 10);
		// 自定义列宽
		// sheet.autoSizeColumn((short)1);
		sheet.setColumnWidth((short)1, (short)(268*21));
		sheet.setColumnWidth((short)3, (short)(268*13));
		sheet.setColumnWidth((short)10, (short)(268*21));
		sheet.setColumnWidth((short)11, (short)(268*16));

		// 设置字体格式
		HSSFFont font = workbook.createFont();
		font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		font.setFontName("仿宋_GB2312");
		font.setFontHeightInPoints((short) 12);
		// 创建格式模型
		HSSFCellStyle cs = workbook.createCellStyle();
		cs.setBorderTop(HSSFCellStyle.BORDER_MEDIUM);
		cs.setBorderLeft(HSSFCellStyle.BORDER_MEDIUM);
		cs.setBorderBottom(HSSFCellStyle.BORDER_MEDIUM);
		cs.setBorderRight(HSSFCellStyle.BORDER_MEDIUM);
		// 自动换行
		cs.setWrapText(true);
		// 上下居中
		cs.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		cs.setFont(font);
		// 创建数据项格式
		HSSFCellStyle cs1 = workbook.createCellStyle();
		cs1.setBorderTop(HSSFCellStyle.BORDER_THIN);
		cs1.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		cs1.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		cs1.setBorderRight(HSSFCellStyle.BORDER_THIN);
		cs1.setWrapText(true);
		cs1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		String[] titles = { "日期", "期号", "事发时间", "首报时间", "首报单位","地点","事件标题","类别","等级","领导现场指挥","区领导批示","报市应急办","处置中存在的问题","首报人","接电人" };
		HSSFRow dataTitleRow = sheet.createRow((short) sheetRowNum++);

		
		//获取用户选择的输出项
		for (int i = 0; i < titles.length; i++) {
			HSSFCell cell = dataTitleRow.createCell((short) i);
			cell.setCellType(HSSFCell.CELL_TYPE_STRING);
			cell.setCellValue(new HSSFRichTextString(titles[i]));
			cell.setCellStyle(cs);
		}
			
		// 数据模型转换:创建表格数据
		for (int i = 0; i < list.size(); i++) {
			EventExport eventexport = (EventExport) list.get(i);
			HSSFRow dataRow = sheet.createRow((short) (i+sheetRowNum));
			HSSFCell celldate = dataRow.createCell((short) 0);
			HSSFCell cellqihao = dataRow.createCell((short) 1);
			HSSFCell cellhappentime = dataRow.createCell((short) 2);
			HSSFCell cellreporttime = dataRow.createCell((short) 3);
			HSSFCell cellreportdepart = dataRow.createCell((short) 4);
			HSSFCell celladdress = dataRow.createCell((short) 5);
			HSSFCell cellevent = dataRow.createCell((short) 6);
			HSSFCell celltype = dataRow.createCell((short) 7);
			HSSFCell cellgrade = dataRow.createCell((short) 8);
			HSSFCell cellcommand = dataRow.createCell((short) 9);
			HSSFCell cell1denote = dataRow.createCell((short) 10);
			HSSFCell cell1report = dataRow.createCell((short) 11);
			HSSFCell cell1problem = dataRow.createCell((short) 12);
			// 中文编码
			celldate.setCellValue(new HSSFRichTextString(eventexport.getDate()));
			cell2.setCellValue(new HSSFRichTextString(jinzhan.getDetailcontent()));
			cellhappentime.setCellValue(new HSSFRichTextString(eventexport.getHappentime()));
			cellreporttime.setCellValue(new HSSFRichTextString(eventexport.getReporttime()));
			cellreportdepart.setCellValue(new HSSFRichTextString(eventexport.getDepartment()));
			celladdress.setCellValue(new HSSFRichTextString(eventexport.getPlace()));
			cellevent.setCellValue(new HSSFRichTextString(eventexport.getEventcontent()));
			celltype.setCellValue(new HSSFRichTextString(eventexport.getEventtype()));
			cellgrade.setCellValue(new HSSFRichTextString(eventexport.getEventlevel()));
			cellcommand.setCellValue(new HSSFRichTextString(eventexport.getLocalleader()));
			cell1denote.setCellValue(new HSSFRichTextString(eventexport.getDenote()));
			cell1report.setCellValue(new HSSFRichTextString(eventexport.getReportflag()));
				
			// 设置各个列的格式
			celldate.setCellStyle(cs1);
			cellqihao.setCellStyle(cs1);
			cellhappentime.setCellStyle(cs1);
			cellreporttime.setCellStyle(cs1);
			cellreportdepart.setCellStyle(cs1);
			celladdress.setCellStyle(cs1);
			cellevent.setCellStyle(cs1);
			celltype.setCellStyle(cs1);
			cellgrade.setCellStyle(cs1);
			cellcommand.setCellStyle(cs1);
			cell1denote.setCellStyle(cs1);
			cell1report.setCellStyle(cs1);
			cell1problem.setCellStyle(cs1);
		
		}
		//输出文件
		OutputStream out = response.getOutputStream();
		response.setCharacterEncoding("gbk");
		response.setContentType("application/x-msexcel");
		response.setHeader("Content-Disposition", "attachment;filename="
				+ ExportUtil.UniC(title) + ".xls");

		workbook.write(out);
		out.close();
	}

/**
	 * 添加标题栏的内容和设置标题格式
	 * 
	 * @param workbook
	 * @param sheet
	 * @param region
	 * @param text
	 * @param cs
	 */
	public static void fillMergedRegion(HSSFWorkbook workbook, HSSFSheet sheet,
			Region region, String text, HSSFCellStyle cs) {
		cs.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		setRegionStyle(workbook, sheet, region, cs);
		HSSFRow row;
		HSSFCell cell;
		// 设置字体格式
		HSSFFont font = workbook.createFont();
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		font.setFontHeightInPoints((short) 18);
		// 居中显示
		cs.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		cs.setFont(font);

		row = sheet.getRow(region.getRowFrom());
		cell = row.getCell(region.getColumnFrom());
		cell.setCellValue(new HSSFRichTextString(text));
		sheet.addMergedRegion(region);
	}

public static void setRegionStyle(HSSFWorkbook workbook, HSSFSheet sheet,
			Region region, HSSFCellStyle cs) {
		for (int i = region.getRowFrom(); i <= region.getRowTo(); i++) {
			HSSFRow row = HSSFCellUtil.getRow(i, sheet);
			for (int j = region.getColumnFrom(); j <= region.getColumnTo(); j++) {
				HSSFCell cell = HSSFCellUtil.getCell(row, (short) j);
				cell.setCellStyle(cs);
			}
		}
	}