学步园

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

/**
     * 创建Excel文件
     * @param dataList（数据）
     * @param path （路径名）
     * @param fileName （文件名）
     * @param sheetName （sheet名）
     * @return （excel文件完整文件名）
     */
    public static String creatExcel(List dataList, String path,
            String fileName, String sheetName) {

        String file = path + fileName + ".xls";

        File dir = new File(FileTool.PATH_REAL_ROOT + path);
        if (!dir.exists())
            dir.mkdirs();

        File excelFile = new File(FileTool.PATH_REAL_ROOT + file);// 要创建的excel文件
        WritableWorkbook excel;
        try {
            excel = Workbook.createWorkbook(excelFile);
            WritableSheet sheet = excel.createSheet(sheetName, 0);

            for (int i = 0; i < dataList.size(); i++) {
                ArrayList datas = (ArrayList) dataList.get(i);
                for (int j = 0; j < datas.size(); j++) {
                    Label label2 = new Label(j, i, (String) datas.get(j));
                    sheet.addCell(label2);
                }
            }
            // log.debug("开始写入");
            excel.write();
            // log.debug("写入完毕");
            excel.close();
            // log.debug("关闭");
            excelFile = null;

        } catch (IOException e) {
            log.exception(e);
        } catch (RowsExceededException e) {
            log.exception(e);
        } catch (WriteException e) {
            log.exception(e);
        }
        return file;
    }

    /**
     * 压缩文件
     * @param inputFileName
     * @param zipFileName
     */
    public static void zip(String inputFileName, String zipFileName) {
        try {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
                    FileTool.PATH_REAL_ROOT + zipFileName));
            File f = new File(FileTool.PATH_REAL_ROOT + inputFileName);
            String base = f.getName();

            out.putNextEntry(new org.apache.tools.zip.ZipEntry(base));
            FileInputStream in = new FileInputStream(f);

            int b;
            while ((b = in.read()) != -1) {
                out.write(b);
            }
            in.close();

            out.close();
        } catch (IOException e) {
            log.exception(e);
        }

    }

    /**
     * 下载文件
     * @param file（文件）
     * @param displayName（下载时显示的文件名）
     * @param response
     */
    public static void download(String file, String displayName,
            HttpServletResponse response) {
        try {
            displayName = URLEncoder.encode(displayName, "UTF-8");
        } catch (UnsupportedEncodingException e1) {
            log.exception(e1);
        }

        response.setContentType("application/x-download");// 设置为下载application/x-download
        response.addHeader("Content-Disposition", "attachment;filename="
                + displayName);

        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            bis = new BufferedInputStream(new FileInputStream(
                    FileTool.PATH_REAL_ROOT + file));
            bos = new BufferedOutputStream(response.getOutputStream());

            byte[] buff = new byte[1024];
            int bytesRead;

            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }

        } catch (final IOException e) {
            log.exception(e);
        } finally {
            if (bis != null)
                try {
                    bis.close();
                } catch (IOException e) {
                    log.exception(e);
                }
            bis = null;
            if (bos != null)
                try {
                    bos.close();
                } catch (IOException e) {
                    log.exception(e);
                }
            bos = null;
        }
    }