Sending Javascript call in servlet response.
I am calling a servlet from a javascript ( .js) file. Based on the status of the server I want send javascript function call to the client browser.
Is it possible?
Here is what I am trying to do :
response.sendRedirect("javascript:myfinction()");
myfunction() is defined in the source .js file from where I am calling the servlet.
Hope you understand what I am trying to do. Please help.
Thanks
Pradip
That won't be possible as the servlet executes first on the server, then javascript executes on the client.
Remember that Javascript requires the browser to do anything, it's the browser functionality that it runs in. The servlet executes on the server, then forwards to the client, and therefore has no access to javascript whatsoever, at least not in the context that you're speaking of. By the time javascript is ready to start, the servlet has already completed.
If it was the other way around, that would be possible (i.e. use JSP/Servlet to set javascript variable value).
Sorry.
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I want to send a response from the servlet and then call another servlet.
Hi,
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</HEAD>
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import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
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import java.io.*;
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import javax.servlet.http.*;
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package mybeans;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
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return "Registration servlet";
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import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
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String cur_UserName;
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String cur_UserOtchestvo;
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Password = admin");
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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xmlns:h="http://java.sun.com/jsf/html"
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Edited by: Atlas77 on Apr 16, 2012 6:53 AM
Edited by: Atlas77 on Apr 16, 2012 6:54 AM
Edited by: Atlas77 on Apr 16, 2012 6:56 AM
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Thanks for replying. Here my answers:
> Did you mark your doPost as synchronized?
No.
> Also, try testing w/ native i/o vs not ... is there a difference?
With native I/O turned off I get a little lower performance, but the
difference is not too big.
Best,
Samuel Kounev
> Peace,
>
> --
> Cameron Purdy
> Tangosol Inc.
> << Tangosol Server: How Weblogic applications are customized >>
> << Download now from http://www.tangosol.com/download.jsp >>
>
> "Samuel Kounev" <[email protected]> wrote in message
> news:[email protected]...
> >
> > Hi all,
> >
> > I encountered the following 2 servlet problems in WLS 6.0/ 6.1:
> >
> > 1. Processing concurrent POST requests
> >
> > WLS seems to disallow concurrent executions of any servlet's doPost
> servlet method.
> >
> > When two clients attempt to send a request to a servlet using POST, the
> socond
> > one
> > is blocked until the first customer is served. In essence, the servlet
> ends up
> > operating in
> > 1-user mode. I just learned from Jervis Liu that the problem is solved in
> WLS6.0
> >
> > if you disable http-keepalive.
> >
> > For WLS 6.1 a partial workaround is to make the servlet work in a
> single-thread
> >
> > mode (by implementing the javax.servlet.SingleThreadModel interface). In
> this
> > case,
> > WLS dispatches concurrent requests to different instances of the servlet.
> > This doesn't completely eliminate the problem - still only one customer
> can be
> >
> > connected at a time. The improvement is that once the first customer is
> disconnects,
> > the second can be served even if the doPost method for the first has not
> finished
> > yet.
> >
> > 2. Flushing the response buffer in WLS 6.1
> > The servlet response buffer is not flushed automatically until doPost
> ends, unless
> > you
> > explicitly call response.flushBuffer(). Closing the output stream doesn't
> flush
> > the
> > buffer as per the documentation.
> >
> > I see that other people are experiencing the same problems.
> >
> > Has anyone found any solutions/workarounds or at least an explanation.
> > Any input would be highly appreciated.
> >
> > Thanks in advance.
> >
> > Samuel Kounev
=====================================================
Samuel D. Kounev
Darmstadt University of Technology
Department of Computer Science
DVS1 - Databases & Distributed Systems Group
Tel: +49 (6151) 16-6231
Fax: +49 (6151) 16-6229
E-mail: mailto:[email protected]
http://www.dvs1.informatik.tu-darmstadt.de
http://skounev.cjb.net
=====================================================
[att1.html]
-
Manually call action servlet from JSP
Hi All,
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Java program for ur reference:(client machine)
import java.io.*;
import java.net.*;
public class authen
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Are you sure that the URL your JSP creates is identical to the one that works in your browser? Have you printed it out to stdout to verify that it's true? (Code inspection and "it looks right" doesn't count.)
Why are you doing it this way? It's common to have a JSP send to a servlet, but the usual way of doing it is to put an HTML form in the JSP, including an HTML <input type="submit">, and POSTing the form data to a servlet URL. Why aren't you doing that? - MOD -
How to call a servlet in new window without toolbar from OA page
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at oa_html._OA._jspService(_OA.java:86)
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at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
at oracle.jsp.JspServlet.internalService(JspServlet.java:178)
at oracle.jsp.JspServlet.service(JspServlet.java:148)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:175)
at oa_html._OA._jspService(_OA.java:96)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
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at oracle.jsp.JspServlet.internalService(JspServlet.java:178)
at oracle.jsp.JspServlet.service(JspServlet.java:148)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
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## Detail 0 ##
oracle.apps.fnd.framework.OAException: The application id or shortname () you entered does not exist.
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at oa_html._OA._jspService(_OA.java:86)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
at oracle.jsp.JspServlet.internalService(JspServlet.java:178)
at oracle.jsp.JspServlet.service(JspServlet.java:148)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:175)
at oa_html._OA._jspService(_OA.java:96)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
at oracle.jsp.JspServlet.internalService(JspServlet.java:178)
at oracle.jsp.JspServlet.service(JspServlet.java:148)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
at org.apache.jserv.JServConnection.run(JServConnection.java:294)
at java.lang.Thread.run(Thread.java:534)
oracle.apps.fnd.framework.OAException: The application id or shortname () you entered does not exist.
at oracle.apps.fnd.framework.webui.OAWebBeanFactoryImpl.getAppId(OAWebBeanFactoryImpl.java:5391)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:969)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:502)
at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:423)
at oa_html._OA._jspService(_OA.java:86)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
at oracle.jsp.JspServlet.internalService(JspServlet.java:178)
at oracle.jsp.JspServlet.service(JspServlet.java:148)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at oracle.jsp.provider.Jsp20RequestDispatcher.forward(Jsp20RequestDispatcher.java:162)
at oracle.jsp.runtime.OraclePageContext.forward(OraclePageContext.java:175)
at oa_html._OA._jspService(_OA.java:96)
at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:385)
at oracle.jsp.JspServlet.doDispatch(JspServlet.java:259)
at oracle.jsp.JspServlet.internalService(JspServlet.java:178)
at oracle.jsp.JspServlet.service(JspServlet.java:148)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
at org.apache.jserv.JServConnection.run(JServConnection.java:294)
at java.lang.Thread.run(Thread.java:534) -
How to call a servlet from another servlet
hi everybody,
i have a problem, i have to call one servlet from another one.
Everything works on my pc, but when i install the application on the customer's server i got an error about an Uknown URL followed by the name of the machine.
Wjat i do is the folloqing :
String urlString = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+"/"+servletName;
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
the variable servletName is the name of the servlet i have to call.
Is there another way to call the servlet ?
All the servlet are installed in the same server.
Any suggestion ?
Cheers.
StefanoSweep is correct about requestDispatcher being another approach for inter-servlet delegation; the only issue that i recall with this approach is that it defaults the method of the destination servlet to the one it was called from...for example, calling servlet2 from within servlet1.post() resulted in the dispatcher attempting to utilize servlet2.post() - i believe that i searched for a parameterize solution to no avail :( (ended up handling the request by placing a "fake" doPost() in servlet2 that simply called servlet2.doGet())
however, if your application is functioning correctly on your pc/webserver then the problem may be external to servlet communication (e.g. client webserver's ports not configured or blocked, missing runtime classes, etc.)
my suggestion would be to set aside the programmatic concerns for the moment - what is the response if you open a browser on a client's machine and access the URL in question (i.e. http://clientserver:port/stefanoServlet)? If it will not respond to access in this manner then it certainly won't when your application calls for it.
It's possible that there is a coding error but, given the info supplied, i'd start examining the environment, first. Let us know if you have any luck with the test i recommended or not (please provide abundant detail). Or, if you've found the solution then you may want to post back with a quick blub so the next person knows how to escape the trap.
D -
Weblogic 12c Servlet Response - Special characters show up as question mark
My web app is running on Weblogic 12c (12.1.1) using WebWork + Hibernate. The program streams data (bytes making up a pdf) from a CLOB in an Oracle Database to the AsciiStream of the servlet output response. No exceptions are thrown, but the generated pdf contains blank pages. Comparing the bytes of the generated pdf, special characters are showing up as question marks.
Some of the bytes read in from the database contain 8 bits (correct data), but the bytes that the servlet return contain only 7 (all bytes with 8 bits become "1111111"). The number of bytes returned from the servlet is correct.
Code:
//Response is HttpServletResponse
response.setContentType("application/pdf");
response.setHeader("Content-Disposition", "inline; filename=\"test.pdf\"");
out = response.getOutputStream();
byte[] buf = new byte[16 * 1024];
InputStream in = clob.getAsciiStream();
int size = -1;
while ((size = in.read(buf)) != -1){
// buf contains the correct data
out.write(buf, 0, size);
// other exception handling code, etc
out.flush();
out.close();
"Correct" pdf byte example:
10011100
10011101
1010111
1001011
1101111
11011011
Incorrect pdf byte example:
111111
111111
1010111
1001011
1101111
111111
I have verified that the data read from the CLOB in the database IS correct. My guess is that the Weblogic server has some strange servlet settings that causes the bytes to be written to the servlet output stream incorrectly, or a character encoding issue. Any ideas?
Edited by: 944705 on Jul 26, 2012 10:17 AMSolution found, I'll post the work around to those who might encounter the same problem.
Somewhere in the layers of technology (webwork or weblogic I'd guess), the servlet response is encoded into UTF-8 regardless. The encoding in the database was ISO-8859-1. Sending ISO encoded bytes by UTF-8 caused the conflicting character codes (anything above 127) to show up as undefined.
The fix is to decode the input byte array into ISO-8859 string, then encode that string into UTF-8, which can be send by Weblogic.
isoConvert = new String(buf, "ISO-8859-1");
out.write(isoConvert.getBytes("UTF-8"), 0, isoConvert.getBytes("UTF-8").length); -
How to send a request to servlet from a java client.
I called a servlet from java client using URL object.
I could establish a connection with server and display
the content(like req.getservername etc.,)
of servlet on client side(DOS prompt).
My question is how do i send a request to servlet from the client.
let me say, i have to send a value as 10 to servlet and do some processing
( like 10*2 = 20) display the output (20) on client side..
It will be appreciated if u can mention the syntax...just add the query string to the url you use to create the URL object from.
-
Converting emails to servlet requests; servlet responses to emails
Hello,
I had asked this question in the Servlet forum. They directed me to here.
I've some servlet applications that posted by HTML forms with file attachements and other HTML fields.
I want to add email support to my servlets. So, users should be able post and recieve their data by emails.
But, I don't want to add email handling tasks to the current servlet applications. I need a middleware application between end users and my servlets that converts emails to servlet requests, and servlet responses to emails.
Here are the steps:
1- End user sends email with attachments.
2- Emailed data is converted to servlet request by a middleware application.
3- Servlet request is processed by my current servlets.
4- Servlet response is sent to middleware application.
5- Middleware application emails servlet reponse to end user as email.
If I can do that, I will not have to add emailing codes to my current servlets. do you know a product doing that ? Or, can you give me a direction ?
thanks...Have you looked into JMS?
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