java 将多个文件打包成一个zip后进行下载

ZipOutputStream out=new ZipOutputStream(new FileOutputStream(zipFileName));

        for(int i=0;i<fileList.size();i++){

            String filename = (String)fileList.get(i);

            File file = new File(filename);

            zip(out,file);

        }

        out.close();

下载的如下：

 private int blockSize=65000;

File file = new File(sourceFilePathName);

           FileInputStream fileIn = new FileInputStream(file);

 int readBytes = 0;

 readBytes = fileIn.read(b, 0, blockSize);

               totalRead += readBytes;

               out.write(b, 0, readBytes);