关于Applet与servlet通讯问题,高手请进,在线等!


//servlet端的代码
public class PERTSaveServlet extends HttpServlet {       public void service(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, java.io.IOException {       
        ObjectInputStream inputFromApplet = null;
        PERTInfo pertInfo = null;
        PrintWriter out = null;
        BufferedReader inTest = null;
        try {            
            inputFromApplet = new ObjectInputStream(request.getInputStream()); 
            //pertInfo 是一个序列化的对象 
            pertInfo = (PERTInfo) inputFromApplet.readObject();
            inputFromApplet.close();
           
            if (pertInfo != null) {
                ...
            } 
                            // send back a confirmation message to the applet
            out = new PrintWriter(response.getOutputStream());
            response.setContentType("text/plain");
            out.println("confirmed");
            out.flush();
            out.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}
//applet端的代码
protected void sendValueToServlet() {
        ObjectOutputStream outputToServlet = null;        try {
            // connect to the servlet
            
            URL studentDBservlet = new URL(contextPath + "/PERTSaveServlet");
            URLConnection servletConnection = studentDBservlet.openConnection();
                       // inform the connection that we will send output and accept input
            servletConnection.setDoInput(true);
            servletConnection.setDoOutput(true);            // Don't used a cached version of URL connection.
            servletConnection.setUseCaches(false);            // Specify the content type that we will send binary data
            servletConnection.setRequestProperty("Content-Type", "application/octet-stream");            // send the PERTInfo object to the servlet using serialization
            try {
                
                outputToServlet = new ObjectOutputStream(servletConnection.getOutputStream());                
                // serialize the object
                outputToServlet.writeObject(pertInfo);                
                outputToServlet.close();                
            }
            catch (IOException e) {
                System.out.println("Error!!!");
            }            // now, let's read the response from the servlet.
            // this is simply a confirmation string
//            readServletResponse(servletConnection);        }
        catch (Exception e) {
            System.out.println(e.toString());
        }    }为何servlet端接收不到数据？
我是在JBOSS4.0.4+struts环境下调试的，无任何错误提示，APPLET端是正常的，但servlet端好象一点反应都没有？