ResourceResolver.java 文件源码

public LSInput resolveResource(String type, String namespaceURI,
                               String publicId, String systemId, String baseURI) {
    try {
        URL url = new URL(namespaceURI + '/' + systemId);
        String content = cache.get(url);
        if (content == null) {
            content = streamToString(new URL(namespaceURI + '/' + systemId).openStream());
            if (content != null) cache.put(url, content);
        }
        return new Input(publicId, systemId, stringToStream(content));
    }
    catch (MalformedURLException mue) {
        mue.printStackTrace();
        return null;
    }
    catch (IOException ioe) {
        ioe.printStackTrace();
        return null;
    }
}