You should use Java’s built in serialization mechanism. To use it, you need to do the following: Declare the Club class as implementing Serializable: public class Club implements Serializable { … } This tells the JVM that the class can be serialized to a stream. You don’t have to implement any method, since this is … Read more
Sometimes you want to have a parameter of InputStream type, but also to be able to choose not to feed your code with any data. In tests it’s probably easier to mock it but in production you may choose to bind null input instead of scattering your code with ifs and flags. compare: class ComposableReprinter … Read more
An implementation of the answer from Kathy Van Stone: At first, create a helper class, which creates a DataSource from an InputStream: public class InputStreamDataSource implements DataSource { private InputStream inputStream; public InputStreamDataSource(InputStream inputStream) { this.inputStream = inputStream; } @Override public InputStream getInputStream() throws IOException { return inputStream; } @Override public OutputStream getOutputStream() throws IOException … Read more
So you can signal EOF: “Notice that read() returns an int value. If the input is a stream of bytes, why doesn’t read() return a byte value? Using a int as a return type allows read() to use -1 to indicate that it has reached the end of the stream.” http://java.sun.com/docs/books/tutorial/essential/io/bytestreams.html
You don’t need to. The servletcontainer will flush and close it for you. The close by the way already implicitly calls flush. See also chapter 5.6 of Servlet 3.1 specification: 5.6 Closure of Response Object When a response is closed, the container must immediately flush all remaining content in the response buffer to the client. … Read more
The underlying stream may not know it its closed until you attempt to write to it (e.g. if the other end of a socket closes it) The simplest approach is to use it and handle what happens if it closed then, rather than testing it first as well. No matter what you test, there is … Read more
My suggestion is, why dont you write your OutputStream then?! I was about to write one for you, but I found this good example on the net, check it out! LogOutputStream.java /* * Jacareto Copyright (c) 2002-2005 * Applied Computer Science Research Group, Darmstadt University of * Technology, Institute of Mathematics & Computer Science, * … Read more
I need to store data into files inside .jar file and read it again No you don’t. Instead store the ‘default’ file inside the Jar. If it is changed, store the altered file in another place. One common place is a sub-directory of user.home. When checking for the file, first check the existence of an … Read more
Look at Channels.newChannel(OutputStream). It will give you a channel given an OutputStream. With the WritableByteChannel adapter you can provide the ByteBuffer which will write it to the OutputStream. public void writeBuffer(ByteBuffer buffer, OutputStream stream) { WritableByteChannel channel = Channels.newChannel(stream); channel.write(buffer); } This should do the trick!
Try the Apache Commons TeeOutputStream.