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POPrintWriter over Socket OutputStream Causes Corruption/Loss of Data
 

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    <p>I'm trying to send a string from a server that has a default character encoding of <em>UTF-8</em> to a client that has a default character encoding of <em>windows-1252</em> via a <strong>Socket</strong> and <strong>PrintWriter</strong>.</p> <p>When I run the client below, I'm not getting my original value of 141 back, despite even my attempts at converting the String using <strong>CharsetDecoder</strong>.</p> <p>As a control test, I've tried running both these classes in Eclipse and enforcing that both use UTF-8 as their default encoding system via the dialogue below-- and I've observed that when both clients are using UTF-8, the output is successfully interpreted on the client's end.</p> <p><strong>Update</strong>: It looks like I'm able to stream bytes and recover the initial format, but in order to do so, I would have to know the encoding being used on the server. Is there not some kind of library that would be useful in this situation? I would much rather not be forced to transmit data in the form of byte arrays.</p> <p><img src="https://i.stack.imgur.com/ENU5g.png" alt="Eclipse Dialog"></p> <p>Server:</p> <pre><code>import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; //Runs on a server with default character encoding of UTF-8 public class TestServer { public static void main(String[] args) throws Exception { PrintWriter writer = null; ServerSocket serverSocket = null; try { int x = 141; String s = "#" + (char)x; serverSocket = new ServerSocket(5555); Socket clientSocket = serverSocket.accept(); writer = new PrintWriter( (new OutputStreamWriter(clientSocket.getOutputStream())), true); System.out.println((int)s.charAt(1)); writer.write(s); } catch(Exception e) { e.printStackTrace(); } finally { writer.close(); serverSocket.close(); } } } </code></pre> <hr> <p>Client:</p> <pre><code>import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.Socket; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.charset.Charset; import java.nio.charset.CharsetDecoder; //Runs on a server with default character encoding of windows-1252 public class TestClient { public static void main(String[] args) throws Exception { Socket s = new Socket("localhost", 5555); BufferedReader reader = new BufferedReader(new InputStreamReader(s.getInputStream())); String string = reader.readLine(); System.out.println((int)string.charAt(1)); //prints 194 when it was 141 on the other end //Charset.defaultCharset returns windows-1252 CharsetDecoder decoder = Charset.defaultCharset().newDecoder(); CharBuffer buffer = decoder.decode(ByteBuffer.wrap(string.getBytes())); String convertedString = buffer.toString(); System.out.println((int)convertedString.charAt(1)); //still prints 194 String convertedString2 = new String(string.getBytes(), "UTF-8"); System.out.println((int)convertedString2.charAt(1)); //prints 65533 ?? s.close(); } } </code></pre>
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