运行cmsxdb在与数据库连接时发生IO.Exception错误

Question

Having installed a new 10g database and then installed the cmsxdb onto it, I followed the instructions for deploying the application. This completed, and the application was started using the web browser.Upon attempting to login the following error is displayed :Stack Trace : oracle.otnsamples.cmsxdb.exception.CMSAccessException: Error sending request : java.io.IOException: Premature EOF
at oracle.otnsamples.cmsxdb.useraction.ServletUtils.sendRequest(ServletUtils.java:165)
at oracle.otnsamples.cmsxdb.useraction.DataUtils.serveRequest(DataUtils.java:330)
at _Contents_2e_jsp._jspService(_Contents_2e_jsp.java:121)
at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:365)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:519)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:423)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:771)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:298)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:829)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:291)
at java.lang.Thread.run(Thread.java:534)谁用过cmsxdb这个示例程序，所有的运行时参数我按照安装说明已成功配置，但在运行时总是出现上述错误，我调试了很久了，大约有半个多月了，快郁闷坏了，谁能帮助我？？请各位大虾不吝赐教！

Answer 1

代码如下：
public HttpURLConnection getServerConnection( String server, String username,
                                            String password ) 
      throws Exception {    HttpURLConnection urlConn = null;
    
    URL url = new URL(server);    // Build the string to be used for Basic Authentication <username>:<password>
    String userPassword =  username + ":" + password;    // Base64 encode the authentication string
    String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());    //URLConnection
    urlConn = (HttpURLConnection) url.openConnection();    // Enable writing to server ( to write request )
    urlConn.setDoOutput(true);
      
    // Enable reading from server ( to read response )
    urlConn.setDoInput(true);    // Disable cache
    urlConn.setUseCaches(false);
    urlConn.setDefaultUseCaches(false);    // Set Basic Authentication parameters
    urlConn.setRequestProperty ("Authorization", "Basic " + encoding);    return urlConn;    
  }  /**
   * This method sends the specified request to the given url and returns the
   * response as an Object. If the returned Object is an instance of 
   * CMSAccessException, throws it.
   * 
   * @param     req  HttpServletRequest that has to be sent to the server
   * @param     servletUrl URL of the server to send request
   * @param     username user name to be used for authentication with server
   * @param     password password to be user for authentication with server
   * 
   * @return  Response from the server
   * 
   * @exception CMSAccessException if server could not handle the request
   */
  public Object sendRequest(HttpServletRequest req, String servletUrl,
                            String username, String password)
      throws CMSAccessException {    // Response from server
    Object responseObj = null;
    
    HttpURLConnection urlConn = null;    try {      String res = "Nothing was returned";      urlConn = this.getServerConnection(servletUrl, username, password);      String contenttype = req.getHeader( "Content-Type" );      // Set Content Type 
      if (contenttype != null) {
        urlConn.setRequestProperty("Content-Type", contenttype);
      } else {
        urlConn.setRequestProperty("Content-Type", "text/plain");
      }      // Get output stream of server to send the request
      BufferedOutputStream connOut = new BufferedOutputStream(urlConn.getOutputStream());      // Establish connection to server
      urlConn.connect();      byte[] buffer = new byte[ BUFFSIZE ]; 
      int len = 0;      // Get the input stream for request
      ServletInputStream in = req.getInputStream();      // Write request
      while ((len = in.read(buffer,0,buffer.length )) >-1) {
        connOut.write(buffer,0,len);
      }      // Close 
      connOut.flush();
      connOut.close();
      in.close();      // Completed sending request, now read response      // Read the object send by server
      ObjectInputStream inputFromServlet = new ObjectInputStream(urlConn.getInputStream());
      responseObj = inputFromServlet.readObject();
      inputFromServlet.close();    } catch (Exception ex) {      throw new CMSAccessException ( "Error sending request  : " +
                                     ex.toString() );    } finally {      // Disconnect
      if( urlConn != null ) {
        urlConn.disconnect();
        urlConn = null;
      }      }    // Check if response is an error message
    if ( responseObj instanceof CMSAccessException ) {
      throw (CMSAccessException)responseObj;
    }    return responseObj;  }
当调试到responseObj = inputFromServlet.readObject()时就出现premature EOF错误！

Answer 2

Oracle XML DB之cmsxdb示例程序可到http://www.oracle.com/technology/sample_code/tech/xml/xmldb/index.html
下载。

Answer 3

解决了，编码和解码的问题。因为在向服务器发送请求时使用了URLEncoding.encode(URL)，导致在服务器端无法正确读取uRL信息，使得返回的对象为空，所以在读取的时候总是出现Premature EOF错误；解决的方法是将URLEncoding.encode(URL)改为URLEncoding.encode(URL)即可。