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如何在写入时压缩文件？

发布于 2024-10-04 21:06:13 字数 103 浏览 9 评论 0原文

有谁知道如何压缩您正在写入的流？我试图避免将文件写入磁盘，并且想知道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，我们希望避免将解压缩的整个文件写入磁盘。

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天涯沦落人 2024-10-11 21:06:13

我想您会对 ZipOutputStream< 感兴趣/a>.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，了解在 Java 中使用压缩文件。以下是该教程的一个片段，可能是一个有用的说明：

     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();

I think you would be interested in ZipOutputStream. You can write to that stream, and then write it out to a zipped file.

Also, check out this tutorial for working with compressed (zipped) files in Java. Here is a snippet from that tutorial, which might be a helpful illustration:

     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();

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