JAVA 文件压缩（IO/NIO）

IO

1. @GetMapping("io")
2.   public void downloadZip() {
3.     long start = System.currentTimeMillis();
4.     EntityWrapper<AttachmentEntity> wrapper = new EntityWrapper<>();
5.     List<AttachmentEntity> attachments = attachmentMapper.selectList(wrapper);
6.     String zpiName = "D:/data/压缩文件io.zip";
7.     try (FileOutputStream fos = new FileOutputStream(
8.         zpiName); ZipOutputStream zipOutputStream = new ZipOutputStream(fos)) {
9.       int i = 0;
10.       for (AttachmentEntity attachment : attachments) {
11.         String uuid = UUID.randomUUID().toString();
12.         FileInputStream fileInputStream = new FileInputStream(attachment.getPath());
13.         zipOutputStream.putNextEntry(new ZipEntry(uuid + "/" + attachment.getName()));
14.         IOUtils.copy(fileInputStream, zipOutputStream);
15.         zipOutputStream.closeEntry();
16.         fileInputStream.close();
17.         i++;
18.       }
19.     } catch (IOException e) {
20.       e.printStackTrace();
21.     }
22.     long end = System.currentTimeMillis();
23.     System.out.println("耗时：" + (end - start));
24.   }

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NIO

1. @GetMapping("nio")
2.   public void downloadZipNio() throws FileNotFoundException {
3.     long start = System.currentTimeMillis();
4.     EntityWrapper<AttachmentEntity> wrapper = new EntityWrapper<>();
5.     List<AttachmentEntity> attachments = attachmentMapper.selectList(wrapper);
6.     String zpiName = "D:/data/压缩文件nio.zip";
7.     try (FileOutputStream fos = new FileOutputStream(zpiName);
8.         ZipOutputStream zos = new ZipOutputStream(fos);
9.         WritableByteChannel wbc = Channels.newChannel(zos)) {
10.       for (AttachmentEntity attachment : attachments) {
11.         FileInputStream fis = new FileInputStream(attachment.getPath());
12.         FileChannel channel = fis.getChannel();
13.         String uuid = UUID.randomUUID().toString();
14.         zos.putNextEntry(new ZipEntry(uuid + "/" + attachment.getName()));
15.         channel.transferTo(0, channel.size(), wbc);
16.       }
17.     } catch (IOException e) {
18.       e.printStackTrace();
19.     }
20.     long end = System.currentTimeMillis();
21.     System.out.println("耗时：" + (end - start));
22.   }

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运行时间对比(ms)

ionio375349350321340330
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