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How to read pdf file and write it to outputStream [closed]

import java.io.*; public class FileRead { public static void main(String[] args) throws IOException { File f=new File(“C:\\Documents and Settings\\abc\\Desktop\\abc.pdf”); OutputStream oos = new FileOutputStream(“test.pdf”); byte[] buf = new byte[8192]; InputStream is = new FileInputStream(f); int c = 0; while ((c = is.read(buf, 0, buf.length)) > 0) { oos.write(buf, 0, c); oos.flush(); } oos.close(); System.out.println(“stop”); is.close(); … Read more

How do I convert an OutputStream to an InputStream?

There seem to be many links and other such stuff, but no actual code using pipes. The advantage of using java.io.PipedInputStream and java.io.PipedOutputStream is that there is no additional consumption of memory. ByteArrayOutputStream.toByteArray() returns a copy of the original buffer, so that means that whatever you have in memory, you now have two copies of … Read more

Writing to ZipArchive using the HttpContext OutputStream

Note: This has been fixed in .Net Core 2.0. I’m not sure what is the status of the fix for .Net Framework. Calbertoferreira’s answer has some useful information, but the conclusion is mostly wrong. To create an archive, you don’t need seek, but you do need to be able to read the Position. According to … Read more

What is InputStream & Output Stream? Why and when do we use them?

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

How to write data to two java.io.OutputStream objects at once?

Try the Apache Commons TeeOutputStream.

Java – How Can I Write My ArrayList to a file, and Read (load) that file to the original ArrayList?

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

Is it necessary to close each nested OutputStream and Writer separately?

Assuming all the streams get created okay, yes, just closing bw is fine with those stream implementations; but that’s a big assumption. I’d use try-with-resources (tutorial) so that any issues constructing the subsequent streams that throw exceptions don’t leave the previous streams hanging, and so you don’t have to rely on the stream implementation having … Read more

Can you explain the HttpURLConnection connection process?

String message = URLEncoder.encode(“my message”, “UTF-8”); try { // instantiate the URL object with the target URL of the resource to // request URL url = new URL(“http://www.example.com/comment”); // instantiate the HttpURLConnection with the URL object – A new // connection is opened every time by calling the openConnection // method of the protocol handler … Read more

Connecting an input stream to an outputstream

Just because you use a buffer doesn’t mean the stream has to fill that buffer. In other words, this should be okay: public static void copyStream(InputStream input, OutputStream output) throws IOException { byte[] buffer = new byte[1024]; // Adjust if you want int bytesRead; while ((bytesRead = input.read(buffer)) != -1) { output.write(buffer, 0, bytesRead); } … Read more

Proper way to close an AutoCloseable

The correct way to use an AutoCloseable instance is with a try-with-resources block, so the resource is reliably closed even if an exception is thrown. Like this: try (OutputStream stream = new …) { … // use the resource } catch (IOException e) { … // exception handling code } You can also control multiple … Read more