Java Utililty Methods URL Connection

URL url = null;
InputStream input = null;
if (uri.startsWith("http://") || uri.startsWith("file:///")) {
    url = new URL(uri);
    URLConnection connection = url.openConnection();
    input = connection.getInputStream();
} else {
    url = classLoader.getResource(uri);
...

URLConnection con = url.openConnection();
con.connect();
con.getInputStream().read();

try {
    URLConnection computeIdUrlConnection = new URL(url).openConnection();
    computeIdUrlConnection.addRequestProperty("Metadata-Flavor", "Google");
    try (BufferedReader reader = new BufferedReader(
            new InputStreamReader(computeIdUrlConnection.getInputStream()))) {
        return reader.readLine(); 
} catch (IOException e) {
...

if (connectTimeout != null) {
    connection.setConnectTimeout(connectTimeout);
if (socketTimeout != null) {
    connection.setReadTimeout(socketTimeout);

final String prefix = _prefix.endsWith("/") ? _prefix : _prefix + "/";
List<String> resourceList = new ArrayList<String>();
JarURLConnection conn = (JarURLConnection) url.openConnection();
Enumeration entries = conn.getJarFile().entries();
while (entries.hasMoreElements()) {
    JarEntry entry = (JarEntry) entries.nextElement();
    String name = entry.getName();
    if (name.startsWith(prefix) && !entry.isDirectory()) {
...

URLConnection connection = url.openConnection();
connection.setRequestProperty("User-agent", "MZmine 3");
InputStream is = connection.getInputStream();
if (is == null) {
    throw new IOException("Could not establish a connection to " + url);
StringBuffer buffer = new StringBuffer();
try {
...

System.gc();
String buffFile = getTempDir().getAbsolutePath() + "\\" + toUniqueFileName(url);
String text = null;
if (useCache) {
    try {
        text = fileToString(buffFile);
    } catch (IOException e) {
    if (text != null) {
        return text;
StringBuffer pageText = new StringBuffer();
URL location = new URL(url);
URLConnection yc = location.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
    pageText.append(inputLine);
in.close();
if (useCache) {
    if (VERBOSE)
        System.out.println("Caching URL.. " + url);
    stringToFile(pageText.toString(), buffFile, false, deleteOnExit);
return pageText.toString();

StringBuffer htmlOutput = new StringBuffer();
InputStreamReader input = new InputStreamReader(http.getInputStream());
BufferedReader inStream = new BufferedReader(input);
String inputLine;
while ((inputLine = inStream.readLine()) != null) {
    htmlOutput.append(inputLine + System.getProperty("line.separator"));
inStream.close();
...

String packagePath = packageName.replace(".", "/");
try {
    JarFile jarFile = ((JarURLConnection) jarUrl.openConnection()).getJarFile();
    Enumeration<JarEntry> entrys = jarFile.entries();
    while (entrys.hasMoreElements()) {
        JarEntry jarEntry = entrys.nextElement();
        String entryName = jarEntry.getName();
        if (!entryName.startsWith(packagePath) || jarEntry.isDirectory()) {
...

String response = mCache.get(resourceUrl);
if (response == null) {
    response = "";
    if (resourceUrl.startsWith("http://")) {
        try {
            URL url = new URL(resourceUrl);
            URLConnection conn = url.openConnection();
            conn.setRequestProperty("Content-type", contentType + "; charset=UTF-8");
...