Java OSS批量下载并压缩为ZIP代码实例

这篇文章主要介绍了Java OSS批量下载并压缩为ZIP代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

  public static void downForZip(HttpServletRequest req, HttpServletResponse response,
    List keyList,String fileName ){
    // 创建临时文件
    File zipFile = null;
    try {
　　　　　　　　//临时文件名称
      zipFile = File.createTempFile("test", ".zip");
 
      FileOutputStream f = new FileOutputStream(zipFile);
      
      CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());
      // 用于将数据压缩成Zip文件格式
      ZipOutputStream zos = new ZipOutputStream(csum);
      OSSClient ossClient= OSSUtil.getInstance();
      for (String ossFile : keyList) {
 // 获取Object，返回结果为OSSObject对象
 
 OSSObject ossObject = ossClient.getObject(OSSUtil.BUCKET, ossFile);
 // 读去Object内容 返回
 InputStream inputStream = ossObject.getObjectContent();
 // 对于每一个要被存放到压缩包的文件，都必须调用ZipOutputStream对象的putNextEntry()方法，确保压缩包里面文件不同名
 String name=ossFile.substring(ossFile.lastIndexOf("/")+1);
 zos.putNextEntry(new ZipEntry(name));
 int bytesRead = 0;
 // 向压缩文件中输出数据
 while ((bytesRead = inputStream.read()) != -1) {
   zos.write(bytesRead);
 }
 inputStream.close();
 zos.closeEntry(); // 当前文件写完，定位为写入下一条项目
      }
      zos.close();
      String header = req.getHeader("User-Agent").toUpperCase();
      if (header.contains("MSIE") || header.contains("TRIDENT") || header.contains("EDGE")) {
 fileName = URLEncoder.encode(fileName, "utf-8");
 //IE下载文件名空格变+号问题
 fileName = fileName.replace("+", "%20");
      } else {
 fileName = new String(fileName.getBytes(), "ISO8859-1");
      }
      response.reset();
      response.setContentType("text/plain");
      response.setContentType("application/octet-stream; charset=utf-8");
      response.setHeader("Location", fileName);
      response.setHeader("Cache-Control", "max-age=0");
      response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
 
      FileInputStream fis = new FileInputStream(zipFile);
      BufferedInputStream buff = new BufferedInputStream(fis);
      BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
      byte[] car = new byte[1024];
      int l = 0;
      while (l < zipFile.length()) {
 int j = buff.read(car, 0, 1024);
 l += j;
 out.write(car, 0, j);
      }
      // 关闭流
      fis.close();
      buff.close();
      out.close();
      ossClient.shutdown();
      // 删除临时文件
      zipFile.delete();
    } catch (IOException e1) {
      e1.printStackTrace();
    }catch (Exception e) {
      e.printStackTrace();
    }
  }

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