Applet Servlet Communication

[thennam]

Dear friends,

when i call a Servlet from a Applet . it give IOException .


it showing this message also " Server returned HTTP response code: 405 for

the URL : url of Servlet "

when I call the Servlet in a normal way it works.

please help me

[sjalle]

This method loads a file (named listName) from the server directory "system" containing a list of image file names
and then loads these images. The class used for connecting (SiteConn) is at the end of this reply.

Note: this method executes in a thread.

private void loadImageSequence() throws Exception {
    String hostName=applet.getDocumentBase().getHost();
    String p=applet.getDocumentBase().getPath();
    int ix=p.lastIndexOf("/");
    String pth="http://"+hostName+"/"+p.substring(0,ix)+"/system/"+listName;

    URL url = new URL(pth);
    System.out.println("url: "+url.toString());
    SiteConn sc = new SiteConn(url); 
    String s = sc.getContents().toString();
    System.out.println("content: "+s);
    String [] ss=s.split("\n");
    MediaTracker mt=new MediaTracker(applet);
    int n=0;
    imgList.clear();
    for (int i=0; i<ss.length && this.running; i++) {
      url=new URL("http://"+hostName+"/"+p.substring(0,ix)+"/images/"+ss[i]);
      Image img=applet.getImage(url);
      mt.addImage(img,n++);
      imgList.add(img);
    }
    // prepare for double buffering
    memImg=new BufferedImage(applet.getWidth(), applet.getHeight(),BufferedImage.TYPE_INT_RGB);
    mt.addImage(memImg,n++);
    try {
      mt.waitForAll();
    } catch (Exception ex) {
      msg="Image load fail: "+ex.getMessage();
    }
    memG=memImg.getGraphics();
    repaint();
  }

The SiteConn class

/**
Usage example:
try {
  URL url=new URL("http://www.whatever.com/servlets/store?text=storeThisTExt");
  SiteConn aConnection=new SiteConn(url);
  StringBuffer sb=aConnection.getContens();
  System.out.println(sb.toString());
} catch (MalFormedURLException mfe) {
  System.err.println(mfe.getMessage());
}
 *
 */

public class SiteConn {
  URL url=null;
  public SiteConn(URL  url) {
    this.url=url;
  }
  public StringBuffer getContents() throws Exception {
    StringBuffer buffer;
    String line;
    int responseCode;
    HttpURLConnection connection;

    BufferedReader dataInput;
    connection = (HttpURLConnection)url.openConnection();
    responseCode = connection.getResponseCode();
    if (responseCode != HttpURLConnection.HTTP_OK) {
      throw new Exception("HTTP response code: " +
         String.valueOf(responseCode));
    }
    try {
      buffer = new StringBuffer();
      InputStream input = connection.getInputStream();
      dataInput = new BufferedReader(new InputStreamReader(input));

      while ( (line = dataInput.readLine()) != null) {
        buffer.append(line);
        buffer.append('\n');
        //System.out.println("line: " + line);
      }
      input.close();
    } catch (Exception ex) {
      ex.printStackTrace(System.err);
      return null;
    }
   return buffer;
  }
  public byte [] getByteBuffer () throws Exception {

    String line;
    int responseCode;
    HttpURLConnection connection;


    connection = (HttpURLConnection)url.openConnection();
    InputStream input=connection.getInputStream();

    responseCode = connection.getResponseCode();

    if (responseCode != HttpURLConnection.HTTP_OK) {
      throw new Exception("HTTP response code: " +
         String.valueOf(responseCode));
    }

    try {
      byte [] b=new byte[1420];
      BufferedInputStream in=new BufferedInputStream(input);
      ByteArrayOutputStream out=new ByteArrayOutputStream();
      System.out.println("starting");
      int n=in.read(b);
      System.out.println("start:"+n);
      while (n  > 0) {
        out.write(b,0,n);
        n=in.read(b);
        System.out.println("buf:"+n);
      }
      out.close();
      input.close();
      return out.toByteArray();
    } catch (Exception ex) {
      ex.printStackTrace(System.err);
      return null;
    }

  }

}