Can't read Chinese words when unzipping multiple zip files

Question

My program performs well in test1 to test3 txt. However, it occurs some error when reading 你好.txt. I would like to ask how I can modify my program to fix this problem.

Here is the folder structure. A note folder contains two zip folders which are zipFile1 and zipFile2. I appreciate if anyone can answer my question.

Operating System: Window 10

Error message: Exception in thread "main" java.util.zip.ZipException: invalid CEN header (bad entry name)

Version of java: openjdk version "1.8.0_191-1-ojdkbuild

├── note
    ├── zipFile1.zip
            ├── test1.txt
            ├── test2.txt

    ├── zipFile2.zip
            ├── test3.txt
            ├── 你好.txt

Here is my program.

public class test {

    
    private static final String SOURCE_FOLDER = "note_folder_path";
    
    static File folder = new File(SOURCE_FOLDER);
    static File[] files = folder.listFiles();
    
    final static Charset CHINESE_CHARSET = Charset.forName("MS950");

    public static void main(String[] args) throws IOException
    {
        
        for (File file:files) {
            extractFolder(file.getAbsolutePath());
        }
        
    }
    
    public static void extractFolder(String zipFile) throws IOException {
        int buffer = 2048;
        File file = new File(zipFile);

        try (ZipFile zip = new ZipFile(file,CHINESE_CHARSET))
        
        {
          String newPath = zipFile.substring(0, zipFile.length() - 4);

          new File(newPath).mkdir();
          Enumeration<? extends ZipEntry> zipFileEntries = zip.entries();

          // Process each entry
          while (zipFileEntries.hasMoreElements()) {
            // grab a zip file entry
            ZipEntry entry = zipFileEntries.nextElement();
            String currentEntry = entry.getName();
            File destFile = new File(newPath, currentEntry);
            File destinationParent = destFile.getParentFile();

            // create the parent directory structure if needed
            destinationParent.mkdirs();

            if (!entry.isDirectory()) {
              BufferedInputStream is = new BufferedInputStream(zip.getInputStream(entry));
              int currentByte;
              // establish buffer for writing file
              byte[] data = new byte[buffer];

              // write the current file to disk
              FileOutputStream fos = new FileOutputStream(destFile);
   
              try (BufferedOutputStream dest = new BufferedOutputStream(fos, buffer)) {

                // read and write until last byte is encountered
                while ((currentByte = is.read(data, 0, buffer)) != -1) {
                  dest.write(data, 0, currentByte);
                }
                
                
                dest.flush();
                is.close();
              }
            }

            if (currentEntry.endsWith(".zip")) {
              // found a zip file, try to open
              extractFolder(destFile.getAbsolutePath());
            }
          }
        }
    }
}

Answer 1

This is a filename encoding issue and nothing to do with the contents of 你好.txt.

Looking at the source code for java.util.zip here, the error message invalid CEN header (bad entry name) is output

1. if the language encoding bit is set in the zip file and the filename is not valid UTF-8
2. when UTF-8 is not being used and the encoding for the filename does not match the encoding name stored in the encoding environment variable.

See Setting the default Java character encoding for details on using the Java encoding environment variable.

To know for sure what the issue is, can you to share the zip file?

If not, can you post a readout of the internal structure of the file by running zipdetails against the zip file. Usage is

zipdetails -v  zipFile2.zip

This program is present in most recent Linux distributions. As you are running Windows can get access to this script with the WSL if you don't have access to a Linux distrubution.