How to use Servlet Context

Has any one used ServletContext 's setAttribute() method to store parameters in one JSP and access them in another JSP.
I want to replace hy Hidden Parmeters with this method, so that I can hide all my parameter names and their values in the HTML page, when an end user uses View Source option on a browser.
If any one has that code available,please post that so that I can avoid all this coding and testing phase
Thanks
Suresh

It is actually very easy, and I use it often, for example to track the user's login.
In one jsp page you use:
<% session.setAttribute("someName", anObject); %>
Where "someName" is a string with the name you want to give to the object (choose different names for different objects) and aObject can be any object that is a descendant of Object (that means everything but primitive types, to store those use wrappers from the java.lang package, like Integer, Float, etc).
Now, to retrieve in other pages, you just use the getAttribute method and cast to object:
<% AnObject otherObject = (AnObject) session.getAttribute("someName"); %>
A note of caution: The object will remain until session is invalidated (manually or timed out) or the object is expressly removed. If no object with the given name is found, the jsp will throw a NullPointerException, which you are not obligated to catch, but I strongly suggest you do, because there will be a time when that exception is thrown no matter how well coded are your jsp's (for example when a session times out and the user clicks on refresh on some page that asks for an object, etc).
Good Luck.
Ylan

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Hi Experts,
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Ken

Hi Ken,
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Duy

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Hello,
I am trying my first BPM process. I am using the send step while I need to specify the receiver using send context. The value of the send context should be:
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Hi Jayson
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Check this
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I was looking at some of my events and saw that some of them have information under the Context section and some don't. 2 questions about this:
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Hi there,
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Best
Scott ([email protected])
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by CSL ():
I'm using apache Jserv 1.1.2 to run my servlets, a remote database on O8i on linux. all my JDBC programs work fine and other servlets too(with no JDBC) but only JDBC servlets give this message
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Can someone tell me How to configure JSERV to make connection ?<HR></BLOCKQUOTE>
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How to use servlets in portal web application in Weblogic Portal 4.0

We are developing a Portal Web application using Weblogic Portal 4.0 where in we
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Hi Renu
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How to use servlets and JSP for my homepage?

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sraiper

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Here is a list of hosts that support Java:
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I am newbie for weblogic portal. I have tried to created a testing
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I put that class file name in the content URL. To my supprise, the
front end shows the binary code that class, instead of call it and
return what it suppose to return.
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Thanks in advance
Jack

Jack,
The portal framework works based on server-side includes. When you specify the
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on the main source servlet. I think the result that you get was the normal behavior
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binary text").
Did you get?
I gess I help you,
Edoardo Boechat
"Russell Teabeault" <reply to newsgroups> wrote:
Jack,
In the ContentURL field in the EBCC input the servlet path. For example
I
had this in my web.xml:
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>examples.sampleportal.HelloWorldServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/helloworld/*</url-pattern>
</servlet-mapping>
In the ContentURL field I put /helloworld.
Hope this helps.
russ
"jack" <[email protected]> wrote in message
news:[email protected]..
I am newbie for weblogic portal. I have tried to created a testing
portlet with content.jsp, works fine.
Then I tried to create a servlet, compiled it, got the class file.
I put that class file name in the content URL. To my supprise, the
front end shows the binary code that class, instead of call it and
return what it suppose to return.
Any suggestion are highly welcome.
Thanks in advance
Jack

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Hello,
When I define my web.xml as follows:
<!DOCTYPE web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
I get an error in french: "La DTD du type de lélément racine "" doit se terminer par '>'."
Saying that the DTD of type of root element must end with '>'
How can I solve this error?
Thanks for your help,
Tanguy Mezzano

Hi,
Tanguy Mezzano wrote:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >
There is a " (double quote missing in the xsi:schemaLocation attribute. This is the reason. I am guessing that you may have tried manually editing this web.xml file and may not have correctly edited it.
To correct the <? xml ?> and <!DOCTYPE> tags - please openup a blank Web Module Project and copy these two tags only from the web.xml and overwrite the same tags in your web.xml.
Hope that this helps.
Thanks.
p256960.

Servlet Context problem.

have two classes, one is a servletcontextlistner implementation and another one is the actual servlet that will call the first class.
I am trying to have a counter in a servlet that keeps track of how many users have used the servlet. I like to store that in a servletcontextlistener and then call the counters value in the servlet. and also update that counters value.
how can I do this ? are there any good examples that you know ? please help, as i have been stuck on this for manny hours.
ServletContextListner implementation.
public class counterContextListener implements ServletContextListener{
String initialValue = "0";
public counterContextListener(){}
public void contextDestroyed(ServletContextEvent event){}
public void contextInitialized(ServletContextEvent event){
ServletContext context = event.getServletContext();
context.setAttribute("countername", initialValue);
public static String getCounterValue(ServletContext context) {
String value = (String)context.getAttribute("countername");
if (value == null) {
value ="0";
return(value);
}//getCounterValue
} // end of class
Servlet
public void doPost(HttpServletRequest req, HttpServletResponse res) throws
ServletException, IOException{
con = null;
res.setContentType("text/plain");
ServletInputStream sis = req.getInputStream();
DataInputStream dis = new DataInputStream(sis);
String username = dis.readUTF();
dis.close();
PrintWriter out = res.getWriter();
System.out.println("The user has come:"+username+" " +count_users);
//Using servlet context to get the current counter
ServletContext context = getServletContext();
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Error
C:\Program Files\Apache Group\Tomcat 4.1\webapps\mudServlet>javac mudServletTTT.java
mudServletTTT.java:36: cannot resolve symbol
symbol : method getCounterValue (javax.servlet.ServletContext)
location: class mudServletTTT
String counter = getCounterValue(context);
^

Why would you make the Context Listener also responsible for keeping track of the counts?
1st of all, you are doing this inside the Servlet:
String counter = getCounterValue(context); // passing context object.
But the servlet does not have a mehtod called getCounterValue. You need to call the CounterContextListener's method, which means you have to create one:
CounterContextListener ccl = new CounterContextListener();
String counter = ccl.getCounterValue(context);Second, why give the counter context listener two jobs that it doesn't need? You should make a new object - a Counter class:
public class Counter {
private int count;
public Counter() { this(0); }
public Counter(String initialValue) {
    this(Integer.parseInt(initialValue);
public Counter(Integer initialValue) {
    this(initialValue.intValue());
public Counter (int initialValue) {
    count = initialValue;
public Integer getCount() { return new Integer(count); }
public void increment() { addCount(1); }
public void decriment() { addCount(-1); }
public void addCount(int amountToAdd) {
    count = count + amountToAdd;
}Then in your context listener, all you do is add one of these to the context:
public class CounterContextListener implement ServletContextListener {
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext context = sce.getServletContext();
        Counter counter = new Counter();
        context.setAttribute("counter", counter);
    public void contextDestroyed(ServletContextEvenet sce) {
    }In your servlet, you get the counter from the context, get the count, and increment it if you want to:
public void MyServlet exctends HttpServlet {
    public void doPost( ... ) ... {
        ServletContext context = this.getServletContext();
        Counter counter = context.getCounter();
        int count = counter.getCount();
        counter.increment();
}

Is WL cluster servlet-context ?

Hi
          I wish to use servletContext object to cache
          value objects on a server which is in a clustered env.
          Is WL cluster servlet-context? Will I face any problems if I use servlet-context for caching purpose?
          Your feedback on this query is greatly appreciated.
          Thanks
          Jery


Jery,
          ServletContext is not serializable. Use HTTPSessions to store your value objects.
          Jery Vincent wrote:
          > Hi
          >
          > I wish to use servletContext object to cache
          > value objects on a server which is in a clustered env.
          >
          > Is WL cluster servlet-context? Will I face any problems if I use servlet-context for caching purpose?
          >
          > Your feedback on this query is greatly appreciated.
          >
          > Thanks
          > Jery

How can I get the servlet Context from a WebService Implementation?

I have made a webservice endpoint, using the conventional way (WSDL->wsimport->Java interface->implementation) . I need to get the servlet context below the implementation class. I haven't found any way to get the servletContext though. Any clues? Any help will be greatly appreciated.

yes i can found the words's unicode form Cmaps where may be at the type of tounicde and another Cmaps table just like "Adobe-GB1-GBK-EUC" ,but when the word dont have either of them how can i do? when i write a chinese word "一",it just the winansi encoding , there is not Cmap for me to use to change the "G208f" to the word "一"'s unicode value.
best wishes thank you very much

How to use Servlet Context

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