How to check file exist in applet?

Question

I would like to check the existance of a file from an applet. How can I achieve that? I'd tried many attempts but still fail to get an answer. Please kindly help.
Below are my file structures:-
folder/applet/myApplet.java
folder/appletView.jsp
folder/image/image1.gif
I would like to check if image1.gif exist. if yes, then load and display it in applet, but I having problem on the how to specify the file location.

Answer 1

Assuming image1 is in the same folder as the applet:
          InputStream is;
          byte[] buf = new byte[1024];
          URLConnection urlc = null;
          try {
               URL a = new URL(this.getCodeBase(),"image1.gif");
               urlc = a.openConnection();
               is = urlc.getInputStream();
               int len = 0;
               ByteArrayOutputStream bos = new ByteArrayOutputStream();
               while ((len = is.read(buf)) > 0) {
                    bos.write(buf, 0, len);
               // close the inputstream
               is.close();
          } catch (IOException e) {
               try {
// image1.gif probably does not exist
                    // now failing to read the inputstream does not mean the server did not send
                    // any data, here is how you can read that data, this is needed for the same
                    // reason mentioned above.
                    ((HttpURLConnection) urlc).getResponseCode();
                    InputStream es = ((HttpURLConnection) urlc).getErrorStream();
                    int ret = 0;
                    // read the response body
                    while ((ret = es.read(buf)) > 0) {
                    // close the errorstream
                    es.close();
               } catch (IOException ex) {
                    // deal with the exception
          }