リソースからInputStreamの取得するための汎用的なサンプル

    public static InputStream getInputStream(String resource) {
        
        InputStream stream = this.getClass().getResourceAsStream( resource );
        if ( stream == null ) stream = Thread.currentThread().getContextClassLoader().getResourceAsStream( resource );

        if ( stream == null ) {
            File file = new File(resource);
            try {
                return new FileInputStream(file);
            } catch (Exception ex) {
                //
            }
            
            try {
                URL sourceUrl = new URL(resource);
                if (sourceUrl != null) {
                    stream = sourceUrl.openStream();
                }
            } catch (Exception e) {
                return null;
            }
        }
                
        return stream;
    }

InputStream inputStream = getInputStream("http://www.syboos.jp/");

InputStream inputStream = getInputStream("c:/test.txt");

InputStream inputStream = getInputStream("com/syboos/test/My.xml");

InputStream inputStream = getInputStream("/WEB-INF/some.xml");