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

StringgetFileContent(InputStream in)
Helper method to obtain the content of a source file. 
String content = "";
BufferedReader inReader = new BufferedReader(new InputStreamReader(in));
while (inReader.ready()) {
    String line = inReader.readLine();
    content = content + line + "\n";
return content;
StringgetFileContent(InputStream inputStream)
get File Content 
byte[] bytes = new byte[28];
try {
    inputStream.read(bytes, 0, 28);
} catch (IOException e) {
    throw new RuntimeException("read file content error!");
return bytesToHexString(bytes);
StringgetFileContent(InputStream is)
There is a much cleaner implementation of doing this, but good enough since it is only used for testing 
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line = null;
StringBuffer buff = new StringBuffer();
while ((line = br.readLine()) != null) {
    buff.append(line + "\n");
return buff.toString();
StringgetFileContent(InputStream stream)
get File Content 
InputStreamReader reader = new InputStreamReader(stream);
char[] arr = new char[8 * 1024]; 
StringBuilder buf = new StringBuilder();
int numChars;
while ((numChars = reader.read(arr, 0, arr.length)) > 0) {
    buf.append(arr, 0, numChars);
return buf.toString().intern(); 
...
InputStreamgetInputStream(Class clazz)
get Input Stream 
InputStream is = null;
is = clazz.getResourceAsStream(DEFAULT_STRATEGIES_PATH);
if (is == null) {
    throw new FileNotFoundException(
            DEFAULT_STRATEGIES_PATH + " cannot be opened because it does not exist");
return is;
InputStreamgetInputStream(Class ownerClass, String subName, String extension)
Opens an InputStream for a class-associated resource. 
String localName;
if (subName == null) {
    localName = ownerClass.getSimpleName() + '.' + extension;
} else {
    localName = ownerClass.getSimpleName() + '_' + subName + '.' + extension;
return ownerClass.getResourceAsStream(localName);
InputStreamgetInputstream(File compressedFile)
Gets the compressed input stream for an image 
try {
    return new GZIPInputStream(new FileInputStream(compressedFile));
catch (Exception e) {
    e.printStackTrace();
return null;
InputStreamgetInputStream(JarFile file, ZipEntry entry)
get Input Stream 
try {
    return file.getInputStream(entry);
} catch (IOException e) {
    throw new IllegalStateException(e);
InputStreamgetInputStream(Object caller, String name)
Return an appropriate InputStream for the specified test file (which must be inside our current package. 
return (caller.getClass().getResourceAsStream("/org/apache/commons/digester3/plugins/" + name));
InputStreamgetInputStreamAsResource(Class clazz, String fileName)
get Input Stream As Resource 
InputStream stream = clazz.getResourceAsStream(fileName);
return stream;