如何从GZIPInputstream读取

Question

场景是读取gzip文件(.gz扩展名)

要知道有GZIPInputStream类来处理这个问题.

这是将文件对象转换为GZIPStream的代码.

FileInputStream fin = new FileInputStream(FILENAME);
 GZIPInputStream gzis = new GZIPInputStream(fin);

怀疑是如何阅读这个'gzis'对象的内容？

Answer 1

从InputStream解码字节,您可以使用InputStreamReader.BufferedReader将允许您逐行读取您的流.

如果zip是TextFile

ByteArrayInputStream bais = new ByteArrayInputStream(responseBytes);
GZIPInputStream gzis = new GZIPInputStream(bais);
InputStreamReader reader = new InputStreamReader(gzis);
BufferedReader in = new BufferedReader(reader);

String readed;
while ((readed = in.readLine()) != null) {
  System.out.println(readed);
}

正如评论中所注意到的那样 它将忽略编码,并且可能无法正常工作.

改善方案

它会将未压缩的数据写入destinationPath

FileInputStream fis = new FileInputStream(sourcePath);
FileOutputStream fos = new FileOutputStream(destinationPath);
GZIPInputStream gzis = new GZIPInputStream(fis);
byte[] buffer = new byte[1024];
int len = 0;

while ((len = gzis.read(buffer)) > 0) {
    fos.write(buffer, 0, len);
}

fos.close();
fis.close();
gzis.close();