The goal of InputStream and OutputStream is to abstract different ways to input and output: whether the stream is a file, a web page, or the screen shouldn’t matter. All that matters is that you receive information from the stream (or send information into that stream.) InputStream is used for many things that you read … Read more
I realize this is question is old, but I just experienced the same problem. In order to fix this I used this code.. List<String> commandAndParameters = …; File dir = …; // CWD for process ProcessBuilder builder = new ProcessBuilder(); builder.redirectErrorStream(true); // This is the important part builder.command(commandAndParameters); builder.directory(dir); Process process = builder.start(); InputStream is … Read more
Something like this should work. Note that for simplicity, I’ve used a Java 7 feature (try block with closeable resource), and IOUtils from Apache commons-io. If you can’t use those it’ll be a little longer, but the same idea. import org.apache.commons.io.IOUtils; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class StreamUtil { public static … Read more
In FileInputStream, the method read() reads a single byte. From the source code: /** * Reads a byte of data from this input stream. This method blocks * if no input is yet available. * * @return the next byte of data, or <code>-1</code> if the end of the * file is reached. * @exception … Read more
I’ve struggled with the same kind of issues. I can’t remember what exactly was wrong (maybe I forgot to flush / close the streams correctly or something …). Anyway, here is what I came up with. /** * Handle communication with a process, reading its output/error and feeding its input * @param process The process … Read more
You can’t insert data into a file… file systems (in general) simply don’t support such an operation. Typically you’d open one file for reading and another for writing, copy the first part of the file from one stream to the other, write the extra part, then copy the second part of the file. If you’re … Read more
Below is a simple example on how to extract a ZIP File, you will need to check if the file is a directory. But this is the simplest. The step you are missing is reading the input stream and writing the contents to a buffer which is written to an output stream. // Expands the … Read more
Just to expand on FatGuy’s answer for other Googlers that find this; the solution to this “chicken and egg problem” is to have each side open the output stream first, flush the output stream, and then open the input stream. ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream()); out.flush(); ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
Start by verifying that uploadedInputStream is a valid image, prehaps by writing it out using ImageIO.write. You can always use ImageIO.read to read the image back in and write it back out to a ByteArrayInputStream 😉 I did a quick test using H2 database. A few things I noted. Blob#length returns a long, while Blob#getBytes … Read more
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