如何从资源目录中的zip文件获取BufferredReader？

Question

public static BufferedReader fileReaderAsResource(String filePath) throws IOException {
            InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(filePath);
            if (is == null) {
                throw new FileNotFoundException(" Not found: " + filePath);
            }
            return new BufferedReader(new InputStreamReader(is, DEFAULT_ENCODING));
        }

This works for non-zip file. But for zip file, how to return a BufferedReader? The following doesn't work since 'fileName' is a relative path under my 'resources' directory:

public static BufferedReader fileZipReader(String fileName) throws IOException {
        ZipFile zip = new ZipFile(fileName);
        for(Enumeration e = zip.entries(); e.hasMoreElements();){
            ZipEntry zipEntry = (ZipEntry) e.nextElement();
            if(!zipEntry.isDirectory()){
                return new BufferedReader(new InputStreamReader(zip.getInputStream(zipEntry)));
            }
        }
        throw new FileNotFoundException("File not found: " + fileName);
    }

How to change the 'fileZipReader' to make it work?

Answer 1

Create a URL object giving a relative path to zip file.

public class IOUtil {

    public BufferedReader fileZipReader(String fileName) throws IOException, URISyntaxException {
        URL zipUrl = IOUtils.class.getClassLoader().getResource(fileName);
        File zipFile = new File(zipUrl.toURI());
        ZipFile zip = new ZipFile(zipFile);
        for (Enumeration e = zip.entries(); e.hasMoreElements(); ) {
            ZipEntry zipEntry = (ZipEntry) e.nextElement();
            if (!zipEntry.isDirectory()) {
                return new BufferedReader(new InputStreamReader(zip.getInputStream(zipEntry)));
            }
        }
        throw new FileNotFoundException("File not found: " + fileName);
    }

    public static void main(String[] args) throws Exception {
        IOUtil util = new IOUtil();

        BufferedReader br = util.fileZipReader("dia/test.txt.zip");
    }
}