是否存在嵌套归档的有效java.net.URI？

Question

虽然可能是不明智的,但是通过使用URI方案来读取基本上重命名的.zip文件(.ear,.war,.jar等)的存档格式是可能的.jar:

例如,当uri变量求值为单个顶级归档时,以下代码可以正常工作,例如当uri等于时jar:file:///Users/justingarrick/Desktop/test/my_war.war!/

private FileSystem createZipFileSystem(Path path) throws IOException {
    URI uri = URI.create("jar:" + path.toUri().toString());
    FileSystem fs;

    try {
        fs = FileSystems.getFileSystem(uri);
    } catch (FileSystemNotFoundException e) {
        fs = FileSystems.newFileSystem(uri, new HashMap<>());
    }

    return fs;
}

然而,getFileSystem和newFileSystem调用失败的IllegalArgumentException时候URI包含嵌套压缩文件,例如,当uri平等jar:jar:file:///Users/justingarrick/Desktop/test/my_war.war!/some_jar.jar!/(一的.jar一个内部的.war).

java.net.URI嵌套存档文件是否有有效的方案？

Answer 1

正如乔纳斯·柏林上面的评论所述，答案是否定的。来自java.net.JarURLConnection 源：

/* get the specs for a given url out of the cache, and compute and
 * cache them if they're not there.
 */
private void parseSpecs(URL url) throws MalformedURLException {
    String spec = url.getFile();

    int separator = spec.indexOf("!/");
    /*
     * REMIND: we don't handle nested JAR URLs
     */
    if (separator == -1) {
        throw new MalformedURLException("no !/ found in url spec:" + spec);
    }

    jarFileURL = new URL(spec.substring(0, separator++));
    entryName = null;

    /* if ! is the last letter of the innerURL, entryName is null */
    if (++separator != spec.length()) {
        entryName = spec.substring(separator, spec.length());
        entryName = ParseUtil.decode (entryName);
    }
}