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压缩算法 |

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ZipOutputStream

ZipInputStream

GZIPOutputStream

GZIPInputStream

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把多个文件压缩为zip |

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public static void packet(Path[] files, Path zipFile) throws IOException {

OutputStream outputStream = Files.newOutputStream(zipFile, StandardOpenOption.CREATE_NEW);

ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);

for (Path file : files) {

InputStream inputStream = Files.newInputStream(file);

ZipEntry zipEntry = new ZipEntry(file.getFileName().toString());

zipOutputStream.putNextEntry(zipEntry);

int len;

byte[] buffer = new byte[1024 * 10];

while ((len = inputStream.read(buffer)) > 0) {

zipOutputStream.write(buffer, 0, len);

}

inputStream.close();

}

zipOutputStream.closeEntry();

zipOutputStream.close();

outputStream.close();

}

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GIZ压缩/解压缩 |

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/**

* 压缩

* @param data

* @return

* @throws IOException

*/

public static byte[] gZip(byte[] data) throws IOException {

byte[] bytes = null;

ByteArrayOutputStream byteArrayOutputStream = null;

GZIPOutputStream gzipOutputStream = null;

try {

byteArrayOutputStream = new ByteArrayOutputStream();

gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream);

gzipOutputStream.write(data);

gzipOutputStream.finish();

bytes = byteArrayOutputStream.toByteArray();

} finally {

}

return bytes;

}

/**

* 解压缩

* @param data

* @return

* @throws IOException

*/

public static byte[] unGZip(byte[] data) throws IOException {

byte[] bytes = null;

ByteArrayInputStream byteArrayInputStream = null;

GZIPInputStream gzipInputStream = null;

ByteArrayOutputStream byteArrayOutputStream = null;

try {

byteArrayInputStream = new ByteArrayInputStream(data);

gzipInputStream = new GZIPInputStream(byteArrayInputStream);

byte[] buf = new byte[1024];

int num = -1;

byteArrayOutputStream = new ByteArrayOutputStream();

while ((num = gzipInputStream.read(buf, 0, buf.length)) != -1)

{

byteArrayOutputStream.write(buf, 0, num);

}

bytes = byteArrayOutputStream.toByteArray();

byteArrayOutputStream.flush();

} finally {

byteArrayInputStream.close();

gzipInputStream.close();

byteArrayOutputStream.close();

}

return bytes;

}