OutputStreamWriter doesn't write and no error message

Question

Hi,
I wanted to try out a servlet but when I use OutputStreamWriter to write some text to a file on the server and use InputStreamReader to read the contents of the file, error returned is from InputStreamReader (FileNotFound Exception). Any ideas?
import java.applet.*;
import java.io.*;
import java.net.*;
public class TestApplet
    extends Applet {
  public TestApplet() {
  public void init() {
    try {
      jbInit();
    catch (Exception e) {
      e.printStackTrace();
  private void jbInit() throws Exception {
    try {
      // Write section
      URL url = new URL(this.getDocumentBase(), "test2.txt");
      URLConnection connection = url.openConnection();
      connection.setDoOutput(true);
      connection.setDoInput(true);
      BufferedWriter out = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream(), "UTF8"));
      out.write("1232423434");
      out.flush();
      out.close();
      // Reading section
      URL url2 = new URL(this.getDocumentBase(), "test2.txt");
      URLConnection connection2 = url2.openConnection();
      connection2.setDoOutput(false); // GET
      connection2.setDoInput(true);
      BufferedReader in = new BufferedReader(new InputStreamReader(connection2.getInputStream()));
      String line;
      StringBuffer result = new StringBuffer();
      while (null != ( (line = in.readLine()))) {
        result.append(line + "\n");
      in.close();
      System.out.println("contents = " + result + "|");
    catch (Exception e) {
      System.out.println("Exception e = " + e);
      e.printStackTrace();
}The error returned:
Exception e = java.io.FileNotFoundException: http://127.0.0.1/test/servlets/test2.txt
java.io.FileNotFoundException: http://127.0.0.1/test/servlets/test2.txt
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:798)
     at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
     at TestApplet.jbInit(TestApplet.java:93)
     at TestApplet.init(TestApplet.java:50)
     at sun.applet.AppletPanel.run(AppletPanel.java:353)
     at java.lang.Thread.run(Thread.java:534)

Answer 1

You can not just write and read files to a url. You can open a socket to the server and send the file over to a socket server that will write the file and then request the file back from the socket server. Or you can look into the Apache HttpClient and FileUpload packages to upload the file through a servlet and then download back through a servlet.