学步园

类: 

/**
   * <br>入口参数：path,filenames
   * <br>出口参数：String
   * <br>功能介绍：从数据库读取EXCEL文件路径(不包含文件名),名称,压缩成一个zip文件
   * @return Zip文件保存路径
   */
  public String getZipFilepath(String path, ArrayList filenames) throws
      Exception {
    String zipurl = path + "Excel.zip";
    String dir = path;
    ArrayList fileNames = filenames; // 存放文件名,并非含有路径的名字
    ArrayList files = new ArrayList(); // 存放文件对象

    try {
      FileOutputStream fileOut = new FileOutputStream(path + "Excel.zip");
      ZipOutputStream zipos = new ZipOutputStream(fileOut);

      File rootDir = new File(dir);
      listFile(rootDir, fileNames, files);

      for (int i = 0; i < files.size(); i++) {
        FileInputStream fileIn = new FileInputStream( (File) files.get(i));
        zipos.putNextEntry(new ZipEntry( (String) fileNames.get(i)));
        byte[] buffer = new byte[1024];
        while (fileIn.read(buffer) != -1) {
          zipos.write(buffer);
          zipos.flush();
        }
        zipos.closeEntry();
        fileIn.close();
      }
      zipos.close();
    }
    catch (IOException io) {
      io.printStackTrace();
      throw new Exception("Zip压缩文件保存失败!");
    }
    return zipurl;
  }

  private static void listFile(File parentFile, List nameList, List fileList) {
    if (parentFile.isDirectory()) {
      File[] files = parentFile.listFiles();
      for (int i = 0; i < files.length; i++) {
        listFile(files[i], nameList, fileList);
      }
    }
    else {
      fileList.add(parentFile);
      nameList.add(parentFile.getName());
    }
  }

JSP:
<%@ page contentType="text/html;charset=gb2312" import="com.jspsmart.upload.*,java.io.*,java.sql.*,oracle.sql.*,org.apache.log4j.*" %><jsp:useBean id="db" scope="page" class="com.ehub.DBDriver"/><%
  ArrayList excelNames = new ArrayList();
  ArrayList newNames = new ArrayList();

  for(int i=0;i<excelNames.size();i++){
   String excelid = excelNames.get(i).toString();
   download.setExcelId(excelid);
   String filename=download.getExcelId();
   String fileUrl = path + "/" + filename;
   String filePath = download.getFilepath(excelid,fileUrl); // ??excel??
   newNames.add(i,filename);
  }

  String zipPath = download.getZipFilepath(path,newNames);

  java.io.File rootDir = new java.io.File(path);
  download.delAllFile(rootDir);

  download.isAllCheckOut(excelNames);
  
  SmartUpload su = new SmartUpload();
  su.initialize(pageContext);
  su.setContentDisposition(null);
  su.downloadFile(zipPath);