java压缩包里重命名文件求解

求你了解一下😣 无需解压，java压缩包里重命名单个文件名就行了，不是循环重命名全部文件名

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;


protected void rezip( String zipfile, String olddir, String newdir ) {

    Path zipFilePath = Paths.get( zipfile );
    try (FileSystem fs = FileSystems.newFileSystem( zipFilePath, null )) {
        Path oldpathInsideZipPath = fs.getPath( olddir );
        if( ! Files.exists( Paths.get( newdir ) ) )
            Files.createDirectory( Paths.get( newdir ) );

        if ( Files.exists( oldpathInsideZipPath, LinkOption.NOFOLLOW_LINKS ) ) {
            Files.walkFileTree(oldpathInsideZipPath, new SimpleFileVisitor<Path>() {
                 @Override
                 public FileVisitResult visitFile(Path file, BasicFileAttributes attrs)
                     throws IOException
                 {
                     if( file.toString().indexOf( olddir ) > -1 ){
                         String a = file.toString().replaceAll( olddir, newdir );
                         Path b = fs.getPath( a );
                         if( ! Files.exists( b.getParent() ) ){
                             Files.createDirectories( b.getParent() );
                         }
                         Files.move( file, b, LinkOption.NOFOLLOW_LINKS );
                     }
                     return FileVisitResult.CONTINUE;
                 }
                 @Override
                 public FileVisitResult postVisitDirectory(Path dir, IOException e)
                     throws IOException
                 {
                     if (e == null) {
                         Files.delete(dir);
                         return FileVisitResult.CONTINUE;
                     } else {
                         // directory iteration failed
                         throw e;
                     }
                 }
             });
        }
        fs.close();
    } catch ( Exception e ) {
        e.printStackTrace();
    }
}