java实现文件zip压缩 然后下载

前几天因为项目需要 做了一个导出 是在Oracle中blob字段导出数据生成word 然后再下载到客户端

blob为一个特殊字段 可以保存4G的数据 包括图片、视频等

/**
* @功能信息 :导出Word文档
* @参数信息 :outfile:文件路径，id:文档编号
* @返回值信息 :
* @异常信息 :
*/
public boolean readDoc(String outfile, String id) throws Exception {
   DbaObj = new DBstep.iDBManager2000(); // 创建数据库对象
   FileOutputStream fos = null;
   InputStream is = null;
   boolean mResult = false;

   String Sql = "SELECT FileBody,FileSize FROM info_document_file WHERE RecordID='"
     + id + "'";
   try {
    if (DbaObj.OpenConnection()) {
     try {
      ResultSet result = DbaObj.ExecuteQuery(Sql);
      if (result.next()) {
       try {
        int fileSize = result.getInt("FileSize");
        Blob blob = result.getBlob("FileBody");
        file = new File(outfile);

        if (!file.exists()) {
         file.createNewFile();// 如果文件不存在，则创建
        }

        fos = new FileOutputStream(file);
        is = blob.getBinaryStream();// 读出数据后转换为二进制流
        byte[] data = new byte[fileSize];
        int size = 0;

        while ((size = is.read(data)) != -1) {
         fos.write(data, 0, size);
        }

       } catch (Exception ex) {
        ex.printStackTrace();
       }
      }
      result.close();
      mResult = true;
     } catch (SQLException e) {
      e.printStackTrace();
      mResult = false;
     }
    }
   } finally {
    DbaObj.CloseConnection();
    fos.close();
    is.close();
   }
   return (mResult);
}

注：因为用到了第三方控件 所以这块未使用Hibernate 以后有时间 可以进行修改

/**
* 导出功能
*
* @param mapping
* @param form
* @param request
* @param response
* @return
* @throws Exception
*/
public ActionForward export(ActionMapping mapping, ActionForm form,
    HttpServletRequest request, HttpServletResponse response)
    throws Exception {
   List list = new ArrayList();
   // 生成随机文件名
   java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyymmddhhmmss");
   String result = format.format(new java.util.Date());

   ReportForm report = (ReportForm) form;
   String[] exportlist = report.getIds();

   //String str = "导出失败";
   String path = request.getRealPath("/") + "upload/";

   for (int i = 0; i < exportlist.length; i++) {
    if (readDoc(path + exportlist[i] + ".doc", exportlist[i])) {
     //str = "导出成功";
     list.add(exportlist[i] + ".doc");
     // download("http://localhost:8080/infoOA/upload/"+exportlist[i]+".doc",exportlist[i]+".doc");
    }
   }
   // 先生成zip为文件 再删除doc文件
   getZip(list, path, result);
  
   for (int i = 0; i < exportlist.length; i++) {
    deleteFile(new File(path+exportlist[i] + ".doc"));
   }
  
   downLoad(result, path, response);
   //删除zip文件
   deleteFile(new File(path+result+ ".zip"));
        //request.setAttribute("message", str);
   return null;
}

 

/**
* 压缩文件zip
* @功能信息 :
* @参数信息 :
* @返回值信息 :
* @异常信息 :
*/
public void getZip(List list,String path,String fileName) throws Exception{
    byte[] buffer = new byte[1024];
   
   String strZipName = fileName + ".zip";
   ZipOutputStream out = new ZipOutputStream(new FileOutputStream(path
                                     + strZipName));
   for (int j = 0; j < list.size(); j++) {
    String name = list.get(j).toString();
    FileInputStream fis = new FileInputStream(path + name);
    out.putNextEntry(new ZipEntry(name));
    int len;
    while ((len = fis.read(buffer)) > 0) {
     out.write(buffer, 0, len);
    }
    out.closeEntry();
    fis.close();
   }
   out.close();
   System.out.println("生成Demo.zip成功");  
   }

/**
   * 文件下载
   *
   * @功能信息 :
   * @参数信息 :
   * @返回值信息 :
   * @异常信息 :
   */
public void downLoad(String fileName,String path, HttpServletResponse response) throws IOException {
   String strZipName = fileName + ".zip";
   BufferedInputStream bis = null;
   BufferedOutputStream bos = null;
   OutputStream os = null;
   InputStream is = null;
   try {
    File file = new File(path + strZipName);
    if (!file.exists()) {
     System.out.println("文件不存在");
    }

    is = new FileInputStream(file);
    bis = new BufferedInputStream(is);
    os = response.getOutputStream();
    bos = new BufferedOutputStream(os);

    response.setHeader("Pragma", "No-cache");
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expires", 0);
    response.setContentType("application/x-msdownload;charset=utf-8");
    response.setHeader("Content-disposition", "attachment;filename="
               + URLEncoder.encode(strZipName, "utf-8"));
   
    int bytesRead = 0;
    byte[] buffer = new byte[8192];
    while ((bytesRead = bis.read(buffer, 0, 8192)) != -1) {
     bos.write(buffer, 0, bytesRead);
    }

    bos.flush();
    is.close();
    bis.close();
    os.close();
    bos.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
   }

   /**
   * 删除文件信息 根据boolean类型判断文件是否存在
   *
   * @param file
   */

    private boolean deleteFile(File file) {
     if (file.exists()) {
    if (file.isFile()) {
     file.delete();
    } else if (file.isDirectory()) {
     File files[] = file.listFiles();
     for (int i = 0; i < files.length; i++) {
      this.deleteFile(files[i]);
     }
    }
    file.delete();
    return true;
   } else {
    return false;
   }
}