Java Utililty Methods InputStream Read

List of utility methods to do InputStream Read

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Description

The list of methods to do InputStream Read are organized into topic(s).

Method

InputStreamgetInputStreamFile(String URLString)
Get the InputStream from a File 
final String eLabel = "ResourceRequestUtils.getInputStreamFile: ";
OutputStream os = null;
try {
    File file = new File(URLString);
    if ((!file.exists()) || (!file.isFile())) {
        throw new Exception("File resource does not exist: " + URLString);
    return new FileInputStream(file);
...
InputStreamgetInputStreamFor(String path, Class clazz)
get Input Stream For 
return clazz.getClassLoader().getResourceAsStream(path);
InputStreamgetInputStreamForFileAbsolutePath(String _path)
Will check that the path is absolute and is pointing to an existing file. 
InputStream result = null;
if (null != _path) {
    File file = new File(_path);
    if (file.exists() && file.isAbsolute() && !file.isDirectory()) {
        try {
            result = new FileInputStream(file);
        } catch (FileNotFoundException e) {
return result;
InputStreamgetInputStreamForResource(String name)
get Input Stream For Resource 
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
return classLoader.getResourceAsStream(name);
InputStreamgetInputStreamForResource(String relativePath)
get Input Stream For Resource 
String resourcePath = null;
InputStream is = null;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
resourcePath = relativePath.replace("\\", "/");
is = loader.getResourceAsStream(resourcePath);
if (is == null) {
    throw new RuntimeException(
            "Unable to create an input stream as the following resoure was mot found from the classpath "
...
InputStreamgetInputStreamFromAbsolutePath(String resource)
get Input Stream From Absolute Path 
try {
    return new FileInputStream(resource);
} catch (IOException e) {
    return null;
InputStreamgetInputStreamFromClassPath(String filename)
get Input Stream From Class Path 
return Thread.currentThread().getContextClassLoader().getResourceAsStream(filename);
InputStreamgetInputStreamFromFile(File pFile)
Gets an InputStream for the contents of a file - if the file is .gz it will return a stream of the decompressed contents 
if (!pFile.exists())
    return null;
try {
    return new GZIPInputStream(new FileInputStream(pFile));
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    try {
...
InputStreamgetInputStreamFromFile(final File file)
Reads a file an returns an InputStream from it. 
return new FileInputStream(file);
InputStreamgetInputStreamFromZip(ZipInputStream zis, String filename)
Read file from ZIP 
ZipEntry zi = null;
InputStream is = null;
while ((zi = zis.getNextEntry()) != null) {
    if (filename.equals(zi.getName())) {
        is = zis;
        break;
return is;