如何在写入文件时压缩文件？

Question

有没有人知道如何压缩你写的流？我试图避免将文件写入磁盘,并且想知道我是否可以在将数据写入流时压缩数据.

这背后的用例是原始文件将非常大,我们希望避免将整个内容解压缩到磁盘上.

Answer 1

我想你会对ZipOutputStream感兴趣.您可以写入该流,然后将其写入压缩文件.

另外,请查看本教程,了解如何使用Java中的压缩(zipped)文件.以下是该教程的片段,可能是一个有用的插图:

     BufferedInputStream origin = null;
     FileOutputStream dest = new 
       FileOutputStream("c:\\zip\\myfigs.zip");
     ZipOutputStream out = new ZipOutputStream(new 
       BufferedOutputStream(dest));
     //out.setMethod(ZipOutputStream.DEFLATED);
     byte data[] = new byte[BUFFER];
     // get a list of files from current directory
     File f = new File(".");
     String files[] = f.list();

     for (int i=0; i<files.length; i++) {
        System.out.println("Adding: "+files[i]);
        FileInputStream fi = new 
          FileInputStream(files[i]);
        origin = new 
          BufferedInputStream(fi, BUFFER);
        ZipEntry entry = new ZipEntry(files[i]);
        out.putNextEntry(entry);
        int count;
        while((count = origin.read(data, 0, 
          BUFFER)) != -1) {
           out.write(data, 0, count);
        }
        origin.close();
     }
     out.close();

Answer 2

OutputStream在ZipOutputStream(或GZIPOutputStream)中包装另一个,并在上面调用write方法ZipOutputStream.