jxl 寫 excle 文件並下載

action 中代碼：

// 文件名
            String fileName = glRoadPart.getPartName()+"【"+pdMaintenanceQuality.getStartNum()+"—"+pdMaintenanceQuality.getEndNum()+"】"+pdMaintenanceQuality.getAssessMan()+DateUtil.convertDateToString(pdMaintenanceQuality.getAssessDate())+System.currentTimeMillis()+".xls";
            // 目錄
            String directory = this.servlet.getServletContext().getRealPath("temp");
            if (!FileUtil.isDirectoryExist(directory)) {
				FileUtil.createDirectory(directory);
			}
            //新建Excel文件   
            String filePath = directory+"/"+fileName;
            File excleFile=new File(filePath);  
            if (!excleFile.exists()) {
            	excleFile.createNewFile();
			}
            OutputStream outf = new FileOutputStream(excleFile);  
            WritableWorkbook workbook = Workbook.createWorkbook(outf);
            AssessmentExportExcelUtil.getInstance().exportAll(workbook, pdMaintenanceQuality, glRoadSurfaceInfo, glRoadPart, this.servlet.getServletContext());
            workbook.write();
            workbook.close();    //一定要關閉, 否則沒有保存Excel
            outf.close();
            // 設置響應類型和響應首部
            response.setContentType("application/vnd.ms-excel");
//            UploadFile.downloadFile(request, response, excleFile);
            UploadFile.downloadFileByInputStream(request, response, excleFile);
    		//刪除文件
    		FileUtil.deleteFile(excleFile);

下載代碼：

/**
	 * 下載文件
	 * @param request
	 * @param response
	 * @param file
	 * @return
	 * @throws IOException
	 */
	public static boolean downloadFileByInputStream(HttpServletRequest request, HttpServletResponse response, File file) throws IOException {
		if (file!=null) {
			InputStream fileInput = null;
			OutputStream filetoClient = null;
			try {
				fileInput = new FileInputStream(file);
				filetoClient = response.getOutputStream();
				byte[] buffer = new byte[1024*8];
				int len=0;
				// 寫入輸出流
				while((len = fileInput.read(buffer)) != -1){
					filetoClient.write(buffer, 0, len);	
				}
				response.setHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(file.getName(), "UTF-8") + "\"");
			} catch (IOException e) {
				log.error("can not download", e);
				e.printStackTrace();
				response.sendError(405, "File cannot found!");
				return false;
			} finally {
				try {
					if (fileInput != null) {
						fileInput.close();
					}
					fileInput = null;

					if (filetoClient != null) {
						filetoClient.flush();
						filetoClient.close();
					}
					filetoClient =null;
				} catch (IOException e) {
					log.error("can not download", e);
					e.printStackTrace();
					response.sendError(405, "download error!");
					return false;
				}
			}
			return true;
		} else {
			log.error(" file is null");
			response.sendError(405, "File cannot found!");
			return false;
		}
	}

注：下載文件試過用 Writer 和 Reader 實現，但下載下來的文件有文件，不知是不是 Struts 的 writer 實現不同

寫 excel 幫助類（懶得整理了，整個代碼弄上來吧）

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;

import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.VerticalAlignment;
import jxl.write.Label;
import jxl.write.WritableCell;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;

import org.apache.commons.lang.StringUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.xx.xx.yy.model.GlRoadPart;
import com.xx.xx.yy.model.GlRoadSurfaceInfo;
import com.xx.xx.xx.model.PdAssessItem;
import com.xx.xx.xx.model.PdMaintenanceQuality;
import com.xx.xx.xx.vo.ColumnVo;
import com.xx.xx.system.service.AppCodeManager;
import com.xx.xx.system.util.DateUtil;

public final class AssessmentExportExcelUtil {
	private static AssessmentExportExcelUtil instance;
	/** 私有構造方法，以防外部類 new 出實例 */
	private AssessmentExportExcelUtil(){}
	public static synchronized AssessmentExportExcelUtil getInstance() {
		if (instance==null) {
			instance = new AssessmentExportExcelUtil();
		}
		return instance;
	}
	public synchronized void exportAll(WritableWorkbook workbook,  PdMaintenanceQuality pdMaintenanceQuality, GlRoadSurfaceInfo glRoadSurfaceInfo, GlRoadPart glRoadPart, ServletContext servletContext) throws InterruptedException {
		GlRoadSurfaceInfo glRoadSurfaceInfo, GlRoadPart glRoadPart, ServletContext servletContext) {
		List<PdAssessItem> pdAssessItems = AssessmentUtil.getInstance().getPdAssessItems(pdMaintenanceQuality, this.EQUIPMENT_CODE);
		AppCodeManager appCodeManager = (AppCodeManager) getBean("appCodeManager", servletContext);
		String direction = appCodeManager.getAppCodesByCategory(216, pdMaintenanceQuality.getDirection()).getCodeName();
		List<ColumnVo> columnVos= this.getSurveryTypeContents(this.EQUIPMENT_CODE);
		String sheetName = "sheet 1";
		WritableSheet sheet =  workbook.createSheet(sheetName, 4);
		WritableFont wf = new WritableFont(WritableFont.TIMES, 10, WritableFont.BOLD, false);//設置寫入字體   
		try {
			// title 單元格樣式，加粗居中
			WritableCellFormat centerBoldFormat = new WritableCellFormat(wf);   
			// 設置細邊框
			centerBoldFormat.setBorder(Border.ALL, BorderLineStyle.THIN);
			// 單元格居中對齊
			centerBoldFormat.setAlignment(Alignment.CENTRE);
			centerBoldFormat.setVerticalAlignment(VerticalAlignment.CENTRE);
			centerBoldFormat.setWrap(true);
			// title 單元格樣式，加粗靠左對齊
			WritableCellFormat leftBoldFormat = new WritableCellFormat(wf);   
			// 設置細邊框
			leftBoldFormat.setBorder(Border.ALL, BorderLineStyle.THIN);
			// 單元格靠左對齊
			leftBoldFormat.setAlignment(Alignment.LEFT);
			// 正文字樣式
			WritableCellFormat normalFormat = new WritableCellFormat();   
			normalFormat.setBorder(Border.ALL, BorderLineStyle.THIN);
			normalFormat.setAlignment(Alignment.CENTRE);
			normalFormat.setVerticalAlignment(VerticalAlignment.CENTRE);
			// 標題樣式
			WritableCellFormat titleFormat = new WritableCellFormat(wf);
			titleFormat.setAlignment(Alignment.CENTRE);
			titleFormat.setVerticalAlignment(VerticalAlignment.CENTRE);
			int r = 0;
			// 寫 title 
			sheet.addCell(new Label(0, r++, sheetName+"損壞調查表", titleFormat));
			// 合併第 0 行至第一行的1至16單元格
			sheet.mergeCells(0, 0, 15, r++);
			// 寫表頭
			WritableCell labelCF = new Label(0, r, "  路線名稱："+glRoadPart.getPartName(), leftBoldFormat);
			sheet.addCell(labelCF);
			sheet.setColumnView(0, 25);
			labelCF = new Label(1, r, "  調查方向："+direction, leftBoldFormat);
			sheet.addCell(labelCF);
			// 合併2~5單元格
			sheet.mergeCells(1, r, 4, r);
			labelCF = new Label(5, r, "  調查時間："+DateUtil.convertDateToString(pdMaintenanceQuality.getAssessDate())+"         調查人員："+pdMaintenanceQuality.getAssessMan(), centerBoldFormat);
			sheet.addCell(labelCF);
			// 合併5~15單元格
			sheet.mergeCells(5, r, 15, r++);
			labelCF = new Label(0, r, "調查內容", centerBoldFormat);
			sheet.addCell(labelCF);
			// 合併1~3行
			sheet.mergeCells(0, r, 0, r+2);
			// 設置單元格寬度
			for (int i = 1; i < 16; i++) {
				sheet.setColumnView(i, 5);
			}
			labelCF = new Label(1, r, "程度", centerBoldFormat);
			sheet.addCell(labelCF);
			sheet.mergeCells(1, r, 1, r+2);
			labelCF = new Label(2, r, "單位扣分", centerBoldFormat);
			sheet.addCell(labelCF);
			sheet.mergeCells(2, r, 2, r+2);
			labelCF = new Label(3, r, "權重Wi", centerBoldFormat);
			sheet.addCell(labelCF);
			sheet.mergeCells(3, r, 3, r+2);
			labelCF = new Label(4, r, "計量單位", centerBoldFormat);
			sheet.addCell(labelCF);
			sheet.mergeCells(4, r, 4, r+2);
			// 設爲無下邊框
			WritableCellFormat tempFormat1 = new WritableCellFormat(wf);
			tempFormat1.setBorder(Border.TOP, BorderLineStyle.THIN);
			tempFormat1.setBorder(Border.LEFT, BorderLineStyle.THIN);
			tempFormat1.setBorder(Border.RIGHT, BorderLineStyle.THIN);
			tempFormat1.setAlignment(Alignment.CENTRE);
			labelCF = new Label(5, r, "起點樁號："+pdMaintenanceQuality.getStartNum()+"    終點樁號："+pdMaintenanceQuality.getEndNum(), tempFormat1);
			sheet.addCell(labelCF);
			sheet.mergeCells(5, r, 14, r);
			labelCF = new Label(15, r, "累計損壞", centerBoldFormat);
			sheet.addCell(labelCF);
			sheet.mergeCells(15, r, 15, r+2);
			r++;
			// 設爲無下邊框
			WritableCellFormat tempFormat2 = new WritableCellFormat(wf);
			tempFormat2.setBorder(Border.BOTTOM, BorderLineStyle.THIN);
			tempFormat2.setBorder(Border.LEFT, BorderLineStyle.THIN);
			tempFormat2.setBorder(Border.RIGHT, BorderLineStyle.THIN);
			tempFormat2.setAlignment(Alignment.CENTRE);
			labelCF = new Label(5, r, "路段長度："+pdMaintenanceQuality.getRoadLength()+"    路面寬度："+glRoadSurfaceInfo.getRoadSurfaceWidth(), tempFormat2);
			sheet.addCell(labelCF);
			sheet.mergeCells(5, r, 14, r++);
			for (int i = 1; i < 11; i++) {
				labelCF = new Label(4+i, r, i+"", centerBoldFormat);
				sheet.addCell(labelCF);
			}
			r++;
			int count = columnVos.size();
			// 寫表格體
			for (int i=0;i<count;i++) {
				int start = r;
				ColumnVo col = (ColumnVo)columnVos.get(i);
				String unit = col.getUnit();
				// 替換平方米
				if (unit != null && unit.endsWith("</sup>")) {
					unit = "㎡";
				}
				// 程度
				List<String> scopes = col.getScope();
				// 程度代碼
				List<String> scopeCodes = col.getScopeCode();
				// 單位扣分
				List<String> dedUcts = col.getDeduct();
				// 權重
				List<String> powers = col.getPower();
				int size = dedUcts.size();
				// 調查內容
				labelCF = new Label(0, start, col.getContent(), normalFormat);
				sheet.addCell(labelCF);
				// 權重
				labelCF = new Label(3, start, powers.get(0), normalFormat);
				sheet.addCell(labelCF);
				// 計量單位
				labelCF = new Label(4, start, unit, normalFormat);
				sheet.addCell(labelCF);
				int end = start + size -1;
				if (size>1) {
					sheet.mergeCells(0, start, 0, end);
					sheet.mergeCells(3, start, 3, end);
					sheet.mergeCells(4, start, 4, end);
					r = end;
				}
				for (int j = 0; j < size; j++) {
					String scope = scopeCodes.get(j);
					List<PdAssessItem> items = this.filterPdAssessItems(pdAssessItems, col.getContentCode(), scope);
					labelCF = new Label(1, start+j, scopes.get(j), normalFormat);
					sheet.addCell(labelCF);
					labelCF = new Label(2, start+j, dedUcts.get(j), normalFormat);
					sheet.addCell(labelCF);
					Double total = new Double("0");
					// 十個調查格
					for (int k = 1; k <= 11; k++) {
						if (k==11) {
							labelCF = new Label(4+k, start+j, this.formatNumber(total), normalFormat);
							sheet.addCell(labelCF);

						} else {
							Double value = this.getValue(items, k);
							String valueStr = "";
							if (value != null){
								total += value;
								valueStr = value.toString();
							}
							labelCF = new Label(4+k, start+j, valueStr, normalFormat);
							sheet.addCell(labelCF);
						}
					}
				}
				r++;
			}
		} catch (WriteException e) {
			e.printStackTrace();
		}
	}


	/**
	 * 根據 bean 名稱從指定的 servletContext 獲取實例
	 * @param name
	 * @param servletContext
	 * @return
	 */
	private Object getBean(String name, ServletContext servletContext) {
		ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
		return ctx.getBean(name);
	}

}