ZipInputStream failed to decompress Chinese file name? How to set the character set correctly?

ZipInputStream decompression of Chinese file names and solutions

Many developers often encounter character encoding problems when using ZipInputStream to decompress Zip compressed packages containing Chinese file names or folder names, which leads to decompression failures and prompts errors like "malformed input off : 1, length : 1". This article will analyze this problem in depth and provide effective solutions.

The root of the problem is that the character set specified in the ZipInputStream constructor is not used to decompress the file name encoding inside the file, but to read the central directory information of the Zip file itself. The encoding of the central directory depends on the environment in which the compressed package is created and the operating system. Windows systems usually use GB2312 or GBK encoding, while macOS and Linux systems usually use UTF-8 encoding.

Therefore, if a Zip compression package is created under Windows, its central directory is likely to be encoded using GBK. Even if the UTF-8 encoding is specified in the code, ZipInputStream still fails to parse the GBK-encoded central directory correctly, resulting in decompression failure.

Solution:

For Zip packages created by Windows systems, it is recommended to use GBK encoding to read the central directory:

 FileInputStream input = new FileInputStream(targetPath);
ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(input), Charset.forName("GBK"));

Since GBK encoding is compatible with GB2312, this method also applies to the central directory of GB2312 encoding.

Cross-platform solutions:

To write more robust cross-platform compatible code, the Apache Commons Compress library is recommended. This library provides more powerful compression/decompression functions, which can automatically handle Zip compression packages of different encodings, effectively avoiding decompression failures due to character set differences. It can automatically detect and process central directory information of different codes, simplify the development process, and improve the reliability of the code.

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