Hi,what is servlet and http tunneling .
hi,what is servlet and http tunneling .and at which scenario those two are implemented by us .i am expecting good answer from u is at which scenario those we use.please help me in this.
HttpTunnelling is simply acting as a proxy. You will receive a web request at your Servlet, use either HttpClient or the standard java.net classes to initiate a new connection to the target web server. Then you will pipe all request bytes through your server to the target server and reverse the process, piping all response bytes from the target server to the client. You are in effect acting as a tunnel between the browser and the target server. This is also known as proxying.
- Saish
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Doubt in Generic Servlet and Http Servlet
Hi,
I studied Genaric Servlet does not support state and session mengement and where as Http Servlet supports state and session mengement.
Why Genaric Servlet does not support state and session mengement ?
Can any one plz tell me reasons.GenericServlet is pretty much the most basic Java application that you can run server-side. It doesn't support much of anything except for the basic life cycle management and a couple other things. Go to Dictionary.com and lookup the word Generic. It's used a lot in software development. Go to http://java.sun.com/j2ee/1.4/docs/api/index.html to read more on the GenericServlet class.
BalusC, because a thread hasn't been active in awhile doesn't mean it's dead. If it were dead it would not be editable. Moreover, the question was never answered (adequately).
Edited by: wpafbuser1 on Jan 3, 2008 3:33 PM -
Use of servlet http tunneling for client server communication
Hello I am having a problem connecting a simple client applet to a server application. I can connect the two directly using sockets. However, when I try to connect the two via a servlet the input stream cannot be accessed. The application is purely for demonstration. Here is some of the source code
A servlet for http tunneling
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SocketServlet extends HttpServlet
ServletInputStream servletinput;
ServletOutputStream servletoutput;
Socket socket;
DataOutputStream dataoutput;
DataInputStream datainput;
public SocketServlet()
public void init(ServletConfig servletconfig) throws ServletException
super.init(servletconfig);
log("Socket servlet initialized.");
public void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
try
servletinput = request.getInputStream();
socket = new Socket( InetAddress.getByName( "127.0.0.1" ), 5000 );
dataoutput = new DataOutputStream( socket.getOutputStream() );
try
byte[] inbytes = new byte[1024];
servletinput.read( inbytes );
String inmessage = new String( inbytes );
dataoutput.writeBytes( inmessage );
catch(IOException ioex)
dataoutput.flush();
datainput = new DataInputStream( socket.getInputStream() );
servletoutput = response.getOutputStream();
try
byte[] outbytes = new byte[1024];
datainput.read( outbytes );
servletoutput.write( outbytes );
catch(IOException ioex)
servletoutput.flush();
servletoutput.close();
catch(Exception ex)
// Server.java
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Server extends JFrame {
private JTextField enter;
private JTextArea display;
DataOutputStream output;
DataInputStream input;
public Server()
super( "Server" );
Container c = getContentPane();
enter = new JTextField();
enter.setEnabled( false );
c.add( enter, BorderLayout.SOUTH );
display = new JTextArea();
c.add( new JScrollPane( display ),
BorderLayout.CENTER );
setSize( 300, 150 );
show();
public void runServer()
ServerSocket server;
Socket connection;
int counter = 1;
try {
// Step 1: Create a ServerSocket.
server = new ServerSocket( 5000, 100 );
while ( true ) {
// Step 2: Wait for a connection.
display.setText( "Waiting for connection\n" );
connection = server.accept();
display.append( "Connection " + counter +
" received from: " +
connection.getInetAddress().getHostName() );
// Step 3: Get input and output streams.
output = new DataOutputStream(
connection.getOutputStream() );
input = new DataInputStream(
connection.getInputStream() );
display.append( "\nGot I/O streams\n" );
// Step 4: Process connection.
String message =
"SERVER>>> Connection successful";
output.writeBytes( message );
enter.setEnabled( true );
display.append( "\nConnected\n" );
do {
try {
byte[] mess = new byte[1024];
input.read( mess );
display.append( "\n" + message );
display.setCaretPosition(
display.getText().length() );
catch (IOException ioex )
} while ( !message.equals( "CLIENT>>> TERMINATE" ) );
// Step 5: Close connection.
display.append( "\nUser terminated connection" );
enter.setEnabled( false );
output.close();
input.close();
connection.close();
++counter;
catch ( EOFException eof ) {
System.out.println( "Client terminated connection" );
catch ( IOException io ) {
io.printStackTrace();
private void sendData( String s )
try {
output.writeBytes( "SERVER>>> " + s );
display.append( "\nSERVER>>>" + s );
catch ( IOException cnfex ) {
display.append(
"\nError writing object" );
public static void main( String args[] )
Server app = new Server();
app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
System.exit( 0 );
app.runServer();
// Fig. 21.4: Client.java
// Set up a Client that will read information sent
// from a Server and display the information.
import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.zip.*;
public class Client extends Applet implements ActionListener {
private TextField enter;
private TextArea display;
DataOutputStream output;
DataInputStream input;
private Button button, button2;
URLConnection connection;
private byte[] bytes1, bytes2;
private String message, message2;
public void init()
setLayout( new BorderLayout() );
enter = new TextField( " Enter text here " );
enter.setEnabled( false );
enter.addActionListener( this );
add( enter, BorderLayout.NORTH );
display = new TextArea( 4, 30 );
display.setEditable( false );
add( display, BorderLayout.CENTER );
button = new Button( "Connect" );
button.addActionListener( this );
add( button, BorderLayout.SOUTH );
public void runClient()
Socket client;
try {
// Step 1: Create a Socket to make connection.
display.setText( "Attempting connection\n" );
URL currentpage = getCodeBase();
String protocol = currentpage.getProtocol();
String host = currentpage.getHost();
int port = 8100;
String urlsuffix = "/servlet/SocketServlet";
URL dataurl = new URL( "http://localhost:8100/servlet/SocketServlet" );
connection = dataurl.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestProperty("Content-type", "application/octet-stream");
connection.setUseCaches( false );
display.append( "\nConnected to: " + host );
// Step 2: Get the output streams.
output = new DataOutputStream(
connection.getOutputStream() );
display.append( "\n got output stream\n" );
// Step 3 get input connection
try
display.append( "\nAttempting to connect to input stream\n" );
input = new DataInputStream( connection.getInputStream() );
bytes1 = new byte[1024];
input.readFully( bytes1 );
display.append( "\nGot input stream\n" );
message = new String( bytes1 );
display.append( "\n" + message + "\n" );
catch ( IOException ioex )
// Step 3: Process connection.
enter.setEnabled( true );
do {
try {
bytes2 = new byte[1024];
input.readFully( bytes2 );
message2 = new String( bytes2 );
display.append( "\n" + message2 );
display.setCaretPosition(
display.getText().length() );
catch ( IOException ioex ) {
display.append(
"\nUnknown object type received" );
} while ( !message.equals( "SERVER>>> TERMINATE" ) );
// Step 4: Close connection.
display.append( "Closing connection.\n" );
output.close();
input.close();
catch (MalformedURLException mfe )
catch ( EOFException eof ) {
System.out.println( "Server terminated connection" );
catch ( IOException e ) {
e.printStackTrace();
private void sendData( String s )
try {
message = s;
output.writeBytes( "CLIENT>>> " + s );
display.append( "\nCLIENT>>>" + s );
catch ( IOException cnfex ) {
display.append(
"\nError writing object" );
public void actionPerformed( ActionEvent e )
if ( e.getActionCommand() == "Connect" )
runClient();
else
sendData( e.getActionCommand() );
public static void main(String args[])
Frame f = new Frame("Chat Client");
Client c = new Client();
c.init();
f.add("Center", c);
f.setSize(300, 150);
f.show();
the connection appears to fail at client step 3, any help is super, thanks
AidanHi,
In your client you are trying to open OutputStream even though you are not using it.
So there are two solutions here.
1. If you dont need OutputStream your code shoud look like this
try {
// Step 1: Create a Socket to make connection.
display.setText( "Attempting connection\n" );
URL currentpage = getCodeBase();
String protocol = currentpage.getProtocol();
String host = currentpage.getHost();
int port = 8100;
String urlsuffix = "/servlet/SocketServlet";
URL dataurl = new URL( "http://localhost:8100/servlet/SocketServlet" );
connection = dataurl.openConnection();
//connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestProperty("Content-type", "application/octet-stream");
connection.setUseCaches( false );
display.append( "\nConnected to: " + host );
// Step 2: Get the output streams.
//output = new DataOutputStream(
//connection.getOutputStream() );
//display.append( "\n got output stream\n" );
display.append( "\n Not interested in output stream\n" );
//Step 3 Inpustream related
// Step 4: Close connection.
display.append( "Closing connection.\n" );
//output.close();
input.close();
1. If you need OutputStream, close your OutputStream before even trying to get InputStream, your code should like this
try {
// Step 1: Create a Socket to make connection.
display.setText( "Attempting connection\n" );
URL currentpage = getCodeBase();
String protocol = currentpage.getProtocol();
String host = currentpage.getHost();
int port = 8100;
String urlsuffix = "/servlet/SocketServlet";
URL dataurl = new URL( "http://localhost:8100/servlet/SocketServlet" );
connection = dataurl.openConnection();
//connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestProperty("Content-type", "application/octet-stream");
connection.setUseCaches( false );
display.append( "\nConnected to: " + host );
// Step 2: Get the output streams.
output = new DataOutputStream(
connection.getOutputStream() );
display.append( "\n got output stream\n" );
//I'll do whateve I've to do with outputstream
//done with output stream closing
output.close();
//Step 3 Inpustream related
// Step 4: Close connection.
display.append( "Closing connection.\n" );
//output.close();
input.close();
hope this works
all the best,
Raj -
HTTP-Tunneling through Apache Plug-in
Hello,
has anybody experience with HTTP-Tunneling of requests to a WLS
4.5.1SP13 through an Apache-Webserver?
I'm not able to configure the apache plug-in from weblogic to act as a
reverse proxy for requests coming from a
Java Client Application.
Any Hints available?
Remo"Jong Lee" <[email protected]> wrote in message
news:3a4a9efa$[email protected]..
>
Remo Schnidrig <[email protected]> wrote:
Hello Jong,
HTTP tunneling will append ".tun" to your request.
For apache, you can use "MatchExpression" to proxy the mime type.
i.e: add the following line to your httpd.conf
MatchExpression *.tunThat is functioning. Thank you very much.
Another question:
What about HTTPS-Tunneling through an Apache-Server?
How can I get everything through?
Thank you
Remo
We don't support https from the bridge to the server yet.
JongWhat about using HTTPS-Tunneling between our Java client and the WLS
Stronghold plug-in and HTTP-Tunneling between the plug-in and the WLS?
If this is possible, how do I have to setup the stronghold?
Remo -
Is forcing Http tunneling mode possible ?
Hello,
in order to make some tests between 2 PC on the same intranet, I would like to know if it's possible to force RMI to use http tunneling, and to choose the mode : http-to-port or http-to-cgi ?
If possible, please tell me how.
Many thanks in advance.
C. BREZAKRMI depends on custom socket factories (sun.rmi.transport.proxy.RMIHttpToPortSocketFactory, sun.rmi.transport.proxy.RMIHttpToCGISocketFactory) for carrying out the HTTP tunneling of RMI request if normal way of establishing a connection with the remote object fails. If no particular RMI socket factory is set in RMI application, RMI runtime chooses the RMIMasterSocketFactory() for creating client and server sockets. This socket factory maintains a list of socket factories which should be tried in order in establishing a successful connection with the remote object. This list includes RMIDirectSocketFacotry and HTTP tunneling socket factories mentioned above if http.proxyHost proerty is set.
You can force HTTP tunneling by explicitly setting default socket factory (RMISocketFactory.setSocketFactory(...)) to sun.rmi.transport.proxy.RMIHttpToPortSocketFactory in the client application. If this fails you can try setting default socket factory to RMIHttpToCGISocketFactory. It may not be possible trying these two options in the same instance of the program, because setSocketFactory() does not allow you to change the already defined default factory to the new one. This may not be elegant solution.
-- Srinath Mandalapu -
Is there a distinction between Tunneling and HTTP Tunneling? The documentation seems to use the terms interchangeably and I was under the impression that there was no distinction. How is enabling tunneling from Protocols > General rather than Protocols > HTTP different?
Tunneling can be any protocol. Http beeing one of them. Actually there is no difference. I/O is routed through host to 3rd host.
Regards,
Jirka -
HTTP tunneling and servlet sessions
I am exploring the use of http tunneling to pass serialized java objects between a swing app
and a weblogic servlet. The basic mechanism works fine but I have been unable to maintain a session
across requests.
Does anyone have any ideas or (hopefully) some sample code?
TIA Bill
Rick,
You may want to look at the Alteon and F5 configuration we have on edocs.
Take a look at the following URLs for a possible solution
http://edocs.bea.com/wls/docs61/cluster/alteon.html#591902
http://edocs.bea.com/wls/docs61/cluster/bigip.html#591902
Chuck Nelson
DRE
BEA Technical Support -
HTTP Tunneling and Load Balancing with Weblogic Server 6.1
We use T3 for Java client to application server communication (Weblogic Server
6.1) and keep the session open for the life of the client. We many customers
using this with load balancers and all works fine. We have just started to use
BEA's HTTP tunneling and I have a question concerning how this will work with
load balancers. Since the single T3 connection has been replaced with a series
of stateless HTTP connections, does the BEA tunneling code put session information
in the HTTP header? If so, what information does it place in the header. If
it does we should be able to use that to make sure that the load balancer always
sends HTTP requests with that session to the same application server.
Thanks!
RickRick,
You may want to look at the Alteon and F5 configuration we have on edocs.
Take a look at the following URLs for a possible solution
http://edocs.bea.com/wls/docs61/cluster/alteon.html#591902
http://edocs.bea.com/wls/docs61/cluster/bigip.html#591902
Chuck Nelson
DRE
BEA Technical Support -
Communication beween an http client a servlet and a socket server
Hello I’m developing an application that needs a client to communicate with a servlet using Http and then the servlet needs to connect to a server using sockets.
The client will send an image to the servlet and then the servlet will send that image to the server.
Everything works OK except when I try to send the data from the servlet to the server. It seems that there is no indication of when the outputstream has reached its end. So when trying to do this at the server side:
BufferedInputStream inFromClient =
new BufferedInputStream(serverSocket.getInputStream());
int inp=0;
while ( (inp=inFromClient.read())!=-1 )
//do smth
}The server will block at the read() method.
If I close the connection from the servlet using the close() method of a print stream everything will work fine
but I don't want to do that because I want the server to send a message back at the servlet.
I don't know if I make any sense but I'm new to servlets and Java as well.
Thanks in advance and if there something that you don't understand please let me know.I'm not quite sure what you mean. I have tried to do the same in the following piece of code and it worked fine. The only difference is that here the data is read from a file but I still send it as raw data(bytes).
import java.io.*;
import java.net.*;
public class Client
private String path="c:\\img0049.jpg";
private static void sendImage(Socket client,BufferedOutputStream toServer)
BufferedInputStream readFile=null;
int inp=0;
try
readFile = new BufferedInputStream( new FileInputStream(path) );
while ( (inp=readFile.read())!=-1 )
toServer.write(inp);
catch (IOException e)
e.printStackTrace();
finally
if (readFile != null)
try {
readFile.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//client.close();
public static void main(String args[]) throws Exception {
// connect through localhost to the same port that the server is listening to
Socket clientSocket = new Socket("127.0.0.1", 4322);
BufferedOutputStream outToServer =
new BufferedOutputStream(clientSocket.getOutputStream());
sendImage(clientSocket,outToServer);
outToServer.close();
clientSocket.close();
}// main
}// classIn the server side I'm just reading it with something like that
try {
BufferedOutputStream out =
new BufferedOutputStream( new FileOutputStream("c:\\out.jpg"));
int inp=0;
while ( (inp=inFromClient.read())!=-1 )
out.write(inp);
out.close(); //close will also flush
//.....rest of codeNow here is the servlet code of the application that I'm discussing (the servlet has already received the data from the client using the Htpp protocol. I know it has through debugging).
I'm guessing that the servlet is storing my data in the BufferedInputStream so then I'm trying to read from there and send it to the server
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
/* Get input stream from mobile client: Servlet<-- Client */
ServletInputStream inputFromClient = request.getInputStream();
BufferedInputStream bufInputFromClient = new BufferedInputStream(inputFromClient);
/*Create socket and get output stream in order to communicate with
* Server: Server<-- Servlet */
Socket clientSocket = new Socket("127.0.0.1",4322);
OutputStream outputToServer = new PrintStream(
clientSocket.getOutputStream());
/* Empty buffer and send data to output stream */
int inp=0;
while ( (inp=bufInputFromClient.read())!=-1 )
outputToServer.write(inp);
outputToServer.flush();
//outputToServer.close(); //If I use this the server will know that the stream has ended At the server I'm using again the 2nd piece of code I posted above.
That's it I hope I'm not confusing you.Thanks -
HTTP tunneling and reverse proxy server
We're currently using Windows Media Services (WMS) to stream
video on our website. There is an option WMS to use the HTTP
protocol and to specify the port you'd like to use. This has
allowed us to stream video through our external firewall, through
our reverse proxy server, and through our internal firewall to our
media server. I've been trying for two days now to get Flash Media
Server (FMS) to do the same thing. For some reason the HTTP
tunneling (RTMPT) protocol doesn't appear to be acting like the
HTTP protocol that WMS is using. Anyone have some tips on this
configuration. I've scoured web resources and documentation as best
I could. Any help would be greatly appreciated.
Thanks.To give a better picture, here's a more complete description of set up and goals
Static IP hits external interface of ASA. ASA has a static nat rule to forward it to my DMZ server.
DMZ server is running IIS 8. Here are what some of the sites look like.
jira.xxxxx.com -> 10.1.10.21 (ubuntu server) | port 80
email.xxxxx.com - > 10.1.10.16 (domain joined server 2012) port 80, 443
media.xxxxx.com -> 10.1.10.14 (domain joined server 2012) port 80, 443
other stuff like this -> 10.1.10.x port 80 or others
All of the A records for those domain names point to the static which routes to the ASA and then is NAT'd to the DMZ server.
What do I need to do in IIS to have those sites get directed to the proper internal locations?
Thanks!! -
What does too many http redirects mean and how do I fix it
Does anyone know what the **** "Too many http redirects" means, and how the **** do I fix it ??
500 errors in the HTTP cycle
Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server:
Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs).
Open an IP socket connection to that IP address.
Write an HTTP data stream through that socket.
Receive an HTTP data stream back from the Web server in response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information.
This error occurs in the final step above when the client receives an HTTP status code that it recognises as '500'. Frank Vipond. September 2010.
Fixing 500 errors - general
This error can only be resolved by fixes to the Web server software. It is not a client-side problem. It is up to the operators of the Web server site to locate and analyse the logs which should give further information about the error.
Fixing 500 errors - CheckUpDown
Please contact us (email preferred) whenever you encounter 500 errors on your CheckUpDown account. We then have to liaise with your ISP and the vendor of the Web server software so they can trace the exact reason for the error. Correcting the error may require recoding program logic for the Web server software, which could take some time.
http://www.checkupdown.com/status/E500.html -
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When I try to compile a program that imports both javax.servlet and javax.servlet.http, the compiler keeps telling me that "package javax.servlet does not exist"... I have place the javax.servlet packages in the src.zip and in the src folder but i dont understand why the compiler isnt picking them up. Maybe I did something wrong ... could someone help please
Try to compile vith the option "-classpath /your/path/to/servlet.jar"
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What do I need to compile and run Servlets and JSP?
Hi there,
What do I need to run Servlets and JSP? I am developing on a Windows platform.
As far as I know, Tomcat and JDK is needed. My JDK (1.3rc1) cannot seem to compile servlet files (javax.servlet.* not found)
Can anyone please advise?
Thank you in advance.If you mean "in a month", then the answer is "afaik, no.", sorry.
If you need something comfortable, you better should buy one of these heavy-weighters like Weblogic, or WebSphere. Cost some $$$$'s, though (between 2000-10000. I guess).
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How get xml-data at servlet by http and parse it?
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here a basic code that reads and parses an remote xml file:
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SAXParserExample extends DefaultHandler {
StringBuffer buffer;
String urlString = "http://nds.nokia.com/uaprof/NN95_8GB-1r100.xml";
public SAXParserExample() {
public void runExample() {
parseDocument();
private void parseDocument() {
// get a factory
SAXParserFactory spf = SAXParserFactory.newInstance();
try {
// get a new instance of parser
SAXParser sp = spf.newSAXParser();
URL url = new URL(urlString);
HttpURLConnection httpSource = (HttpURLConnection) url.openConnection();
// parse the file and also register this class for call backs
sp.parse(httpSource.getInputStream(), this);
} catch (SAXException se) {
se.printStackTrace();
} catch (ParserConfigurationException pce) {
pce.printStackTrace();
} catch (IOException ie) {
ie.printStackTrace();
// Event Handlers
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
System.out.println("+++ start of element: " + qName);
buffer = new StringBuffer();
public void characters(char[] ch, int start, int length) throws SAXException {
buffer.append(ch, start, length);
public void endElement(String uri, String localName, String qName) throws SAXException {
System.out.println(buffer.toString());
System.out.println("+++ end of element " + qName);
public static void main(String[] args) {
SAXParserExample spe = new SAXParserExample();
spe.runExample();
}you have only to change the urlString and adapt to your needs.
hope it helps -
Http.get and http.post is now what under utl_http?
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In short, POST requests are for sending any amount of data directly over the connection without changing the URL, and GET requests are for getting limited amounts of information appended to the URL.
POST requests cannot be bookmarked or emailed and do not change the Uniform Resource Locators (URL) of the response. GET requests can be bookmarked and emailed and add information to the URL of the response.
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