如何将 ArchiveEntry 转换为 InputStream？

Question

我正在使用

阅读tar.gz档案

ArchiveEntry entry = tarArchiveInputStream.getNextEntry();

问题：如何将此 ArchiveEntry 转换为 InputStream，以便我可以实际读取文件并将其处理为 String？

Answer 1

已经是InputStream.

byte[] buf = new byte[(int) entry.getSize()];
int k = tarArchiveInputStream.read(buf, 0, buf.length);
String s = new String(buf, 0, k);

Answer 2

您可以使用 IOUtils 完整读取 InputStream：

import org.apache.commons.compress.utils.IOUtils

byte[] buf = new byte[(int) entry.getSize()];
int readed  = IOUtils.readFully(tarArchiveInputStream,buf);

//readed should equal buffer size
if(readed != buf.length) {
 throw new RuntimeException("Read bytes count and entry size differ");
}

String string = new String(buf, StandardCharsets.UTF_8);

如果您的文件不是 utf-8 编码，请在字符串的构造函数中使用它而不是 utf-8。

Answer 3

如果真的要一个一个读取文件，其实TarEntry里面就保存了File对象：

This class represents an entry in a Tar archive. It consists of the entry's header, as well as the entry's File.

因此只需初始化另一个 FileInputStream 就足够了:

import org.apache.commons.io.IOUtils;
String file = IOUtils.toString(new FileInputStream(entry.getFile());

如何将 ArchiveEntry 转换为 InputStream？

How to convert ArchiveEntry to InputStream?

java

apache-commons-compress