HTTP/Servlet problem
Hi,
This question may sound a little bit stupid but i 'm new with HTML and servlets...
I am trying to do the following:
I have a FORM: <FORM NAME=\"form\">
in which there is a button:
<INPUT TYPE="BUTTON" NAME="searchSession" VALUE="Search" onClick="openWindow('searchSession');">
openWindow is a java script in which a new window is created:
newWindow = window.open('http://"+hostName+":8080/servlet/be.abis.presentation.EnrolmentServlet', 'Select Session', 'menubar,scrollbars,resizable,width=628,height=333');
in the servlet (EnrolementServlet) the request will be forwarded to a specific servlet. This happens through the following code:
if(request.getParameter("searchSession") != null){
requestDispatcher = getServletConfig().getServletContext().getRequestDispatcher("http://"+hostName+":8080/servlet/be.abis.presentation.SearchSessionServlet");
}else if(request.getParameter("ok") != null){
enrolmentBean.saveEnrolment();
}else{
createForm(request, response);
if(requestDispatcher != null){
requestDispatcher.forward(request, response);
what i do not understand is why the request is never forwarded to: http://"+hostName+":8080/servlet/be.abis.presentation.SearchSessionServlet
I 'll rally be thankful if someone could help me out of heren
thnx
PS: Session here has nothing to do with HTTPSession
I am doing the same thing and it do work.
my Javascript looks like following
function OpenNewWindow(url,title)
window.open(url, title, "width=650,height=400,status=yes,resizable=yes,toolbar=yes,status=yes,scrollbars=yes,location=yes,screenX=0,left=0,screenY=0,top=0");
Make sure your host name is right.
Hope this help!!
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ttse <[email protected]> wrote:
> I need to support concurrent access from multiple clients using a non-HTTP protocol
> over socket connection. One way is to write my socket server and create a new
> thread for each request. But WLS forbids user-created threads from calling into
> WLS components such as EJB. So I would like to write a non-HTTP servlet so that
> the WLS servlet container will create a new thread calling into the servlet and
> have the servlet calling EJBs on this WLS created thread. But is there a way to
> plug a subclass of GenericServelt into WLS?
> Thanks,
> T Tse
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* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.io.*;
import java.net.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.text.*;
* @author freddy
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Statement statement;
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String bstr2=null;
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// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
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processRequest(request, response);
doPost(request,response);
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
DataInputStream in = new DataInputStream(
(InputStream)request.getInputStream());
String sid = in.readUTF();
String user = in.readUTF();
String pwd = in.readUTF();
// "jdbc:oracle:thin:@localhost:1521"+": "+sid
String message = message = "Name:"+bstr+" telephone:"+bstr1+" burthday:"+bstr2;
try {
connect(sid,user, pwd);
message += "100 ok connected";
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message += "200 " + t.toString();
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throws Exception {
// Establish a JDBC connection to the MYSQL database server.
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Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
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statement =conn.createStatement();
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catch(SQLException e)
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bstr=rs.getString(2);
bstr1=rs.getString(3);
bstr2=rs.getString(4);
statement.close();
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//bstr += e.toString();
System.err.println(e);
System.exit(1);
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//DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
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//Class.forName("net.sourceforge.jtds.jdbc.Driver");
//Connection conn = DriverManager.getConnection(
// "jdbc:jtds:sqlserver://localhost:1433/"+db,user,pwd);
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public String getServletInfo() {
return "Short description";
// </editor-fold>
}Midlet code
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.io.*;
import java.util.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
* @author freddy
public class testOrcl extends MIDlet implements CommandListener {
protected String url;
private String username;
private Display display;
private Command exit = new Command("EXIT", Command.EXIT, 1);;
private Command connect = new Command("Connect", Command.SCREEN, 1);
private TextField tb;
private Form menu;
private TextField tb1;
private TextField tb2;
DB db;
public testOrcl() throws Exception
display=Display.getDisplay(this);
url="http://localhost:8084/getConnection/getconnection";
public void startApp() {
displayMenu();
public void displayMenu()
menu= new Form("connect");
tb = new TextField("Please input database: ","",30,
TextField.ANY );
tb1 = new TextField("Please input username: ","",30,
TextField.ANY);
tb2 = new TextField("Please input password: ","",30,
TextField.PASSWORD);
menu.append(tb);
menu.append(tb1);
menu.append(tb2);
menu.addCommand(exit);
menu.addCommand(connect);
menu.setCommandListener(this);
display.setCurrent(menu);
public void pauseApp() {
public void destroyApp(boolean unconditional) { }
public void commandAction(Command command, Displayable screen) {
if (command == exit) {
destroyApp(false);
notifyDestroyed();
} else if (command == connect) {
db = new DB(this);
db.start();
db.connectDb(tb.getString(),tb1.getString(),tb2.getString());
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.io.*;
import java.util.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.lang.*;
* @author freddy
public class DB implements Runnable {
testOrcl midlet;
private Display display;
String sid;
String user;
String pwd;
public DB( testOrcl midlet)
this.midlet=midlet;
display=Display.getDisplay(midlet);
public void start()
Thread t = new Thread(this);
t.start();
public void run()
StringBuffer sb = new StringBuffer();
try {
HttpConnection c = (HttpConnection) Connector.open(midlet.url);
c.setRequestProperty(
"User-Agent","Profile/MIDP-2.1, Configuration/CLDC-1.1");
c.setRequestProperty("Content-Language","en-US");
c.setRequestMethod(HttpConnection.POST);
DataOutputStream os =
(DataOutputStream)c.openDataOutputStream();
os.writeUTF(sid.trim());
os.writeUTF(user.trim());
os.writeUTF(pwd.trim());
os.flush();
os.close();
// Get the response from the servlet page.
DataInputStream is =(DataInputStream)c.openDataInputStream();
//is = c.openInputStream();
int ch;
sb = new StringBuffer();
while ((ch = is.read()) != -1) {
sb.append((char)ch);
showAlert(sb.toString());
is.close();
c.close();
} catch (Exception e) {
showAlert(e.getMessage());
/* This method takes input from user like db,user and pwd and pass
to servlet */
public void connectDb(String sid,String user,String pwd) {
this.sid = sid;
this.user = user;
this.pwd = pwd;
/* Display Error On screen*/
private void showAlert(String err) {
Alert a = new Alert("");
a.setString(err);
a.setTimeout(Alert.FOREVER);
display.setCurrent(a);
Comment out process request or rewrite & move it to a position after you read the parameters and connect to the db. Decide where you want to write to the output stream. Also, you have some superfluous casting.
I take it that you are using netbeans? If you debug and step through the code you will get an idea of the flow. The steps should be, midlet connects with POST, doPost is called, server reads parameters, server opens connection, executes query, releases/closes connection, and writes a response to the midlet.
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If you store the username, password, and sid on the midlet, you may have trouble updating the installation base if you need to change the values for any reason. Also, you have clients which contain your database u/p, susceptible to snooping and decompilation. Use the servlet to abstract the db from the client. And use a datasource (with connection pooling) for obtaining connections to db. -
Servlet problem: (Shay Shmeltzer / Steve Muench / Frank Nimphius)
Dear sirs... (Shay Shmeltzer / Steve Muench / Frank Nimphius)
I hope you can give me an answer.
I created an ADF UIX application using JDeveloper 10.1.2. I have created a servlet to download files. my problem is that it works just fine using jdeveloper, while when deployed into oracle application server it causes errors.i am calling this servlet by storing filename and data in the session, then sending redirect request to the browser.
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package view;
import java.io.OutputStream;
import javax.servlet.*;
import javax.servlet.http.*;
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import java.io.IOException;
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public void init(ServletConfig config) throws ServletException
super.init(config);
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try
String DownloadFileName=(String) request.getSession().getAttribute("downloadfilename");
byte data[]=(byte []) request.getSession().getAttribute("downloadfiledata");
if (DownloadFileName==null)
return;
request.getSession().removeAttribute("downloadfilename");
request.getSession().removeAttribute("downloadfiledata");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename="+DownloadFileName);
response.setContentLength(data.length);
OutputStream OS=response.getOutputStream();
OS.write(data);
catch (Exception e)
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
try
String DownloadFileName=(String) request.getSession().getAttribute("downloadfilename");
byte data[]=(byte []) request.getSession().getAttribute("downloadfiledata");
if (DownloadFileName==null)
return;
request.getSession().removeAttribute("downloadfilename");
request.getSession().removeAttribute("downloadfiledata");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename="+DownloadFileName);
response.setContentLength(data.length);
OutputStream OS=response.getOutputStream();
OS.write(data);
catch (Exception e)
and the error is :
java.lang.IllegalStateException: Response has already been committed
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.EvermindHttpServletResponse.resetBuffer(EvermindHttpServletResponse.java:1902)
at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:213)
this error is stored in the log file. if i am running this code from JDeveloper I can download the files using either FireFox or Internet Explorer without any error.
but if i am running this code using Oracle Application Server 10g Realse 2, i can not download the files using either FireFox or IE.
so i created another solution, instead of redirecting from a datapage into the servlet, i put the following code in a data page as follows:
public void onDownload(DataActionContext ctx)
String DownloadFileName=getfilename();
byte data[]=getdata();
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename="+DownloadFileName);
response.setContentLength(data.length);
OutputStream OS=response.getOutputStream();
OS.write(data);
OS.flash();
this time the application works fine when deployed into Oracle Application Server if you use FireFox, but if you use IE, it causes problem, i can not save the file or view it.
what is the problem?
how can i fix this?
i am certin that the second method is not correct and it should not be used.
thanks for everyone in advance
best regardsDear Sir...
Thanks alot for your replay
regarding the reset method. Itried it and it does not give any good.
I discovered the following problem:
If you are redirecting from with struts dataaction page to the servlet, you get the error
Otherwise if you called the servlet from directly or redirected to a servlet from within a servlet, you get no problem.
can any one help me please??
Is it possible that the problem is in IE itself? The file is downloaded perfectly fine with firefox(but the error log still appear)?
best regards -
Need urgent help on file download servlet problem in Internet Explore
I have trouble to make my download servlet work in Internet Explore. I have gone through all the previous postings and done some research on the internet, but still can't figure out the solution. <br>
I have a jsp page called "download.jsp" which contains a URL to download a file from the server, and I wrote a servlet (called DownloadServlet) to look up the corresponding file from the database based on the URL and write the file to the HTTP output to send it back to the browser. <br>
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First, when I click on the URL, the popup window asks me to "open the file from its current location" or "save the file to disk". It also says "You have chosen to download a file from this location, ...(some url).. from localhost"
(1) If I choose "save the file to disk", it will save the rendered "download.jsp" (ie, the currect page with URL I just clicked, which isn't what I want).
(2)But if I choose "open the file from its current location", the 2nd popup window replaces the 1st, which also has the "Open ..." and "Save.." options, but it says "You have chosen to download a file from this location, MYFILE.doc from localhost". (notice it shows the correct file name now)
(3) If I choose "Save..." on the 2nd window, IE will save the correct file which is "myfile.doc"; if I choose "Open ...", a 3rd replaces the 2nd window, and they look the same, and when I choose "Open..." on the 3rd window, IE will use Word to open it.
any ideas?
</a>Did you find a solution to this problem? I've been wrestling with the same issues for the past six months. Nothing I try seems to work. I've tried setting the contentLength(), inline vs. attachments, different write algorythms, etc. I don't get the suggestion to rename the servlet to a pdf file.
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Apache Bridge HTTP POST problems on large file upload
I have a problem uploading files larger than quarter a mega, the jsp
page does a POSTto a servlet which reads the input stream and writes to
a file.
Configuration: Apache webserver 1.3.12 connected to the Weblogic 5.1
application server via the bridge(mod_wl_ssl.so) from WebLogic Service
pack 4.
The upload goes on for about 30 secs and throws the following error.
"Failure of WebLogic APACHE bridge:
IO error writing POST data to 100.12.1.2:7001; sys err#: [32] sys err
msg [Broken pipe]
Build date/time: Jul 10 2000 12:29:18 "
The same upload(in fact I uploaded a 8 MEG file) using the
Netscape(NSAPI) WebLogicconnector.
Any answers would be deeply appreciated.
[email protected]It appears to be a bug.
I suggest that you file a bug report with our support organization. Be sure
to include a complete test case. They will also need information from
you -- please review our external support procedures:
http://www.beasys.com/support/index.html
Thanks,
Michael
Michael Girdley
Product Manager, WebLogic Server & Express
BEA Systems Inc
"George Abraham" <[email protected]> wrote in message
news:[email protected]..
I have a problem uploading files larger than quarter a mega, the jsp
page does a POSTto a servlet which reads the input stream and writes to
a file.
Configuration: Apache webserver 1.3.12 connected to the Weblogic 5.1
application server via the bridge(mod_wl_ssl.so) from WebLogic Service
pack 4.
The upload goes on for about 30 secs and throws the following error.
"Failure of WebLogic APACHE bridge:
IO error writing POST data to 100.12.1.2:7001; sys err#: [32] sys err
msg [Broken pipe]
Build date/time: Jul 10 2000 12:29:18 "
The same upload(in fact I uploaded a 8 MEG file) using the
Netscape(NSAPI) WebLogicconnector.
Any answers would be deeply appreciated.
[email protected]
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