How to call a class method from a jsp page?

Hi all,
i would like to create a basic jsp page in jdev 1013 that contains a button and a text field. When clicking the button, i would like to call a method that returns a string into the text field.
The class could be something like this:
public class Class1 {
public String getResult() {
return "Hello World";
How do i go about this?
Thanks

Here is a sample:
HTML><HEAD><TITLE>Test JDBC for Oracle Support</TITLE></HEAD><BODY>
<%@ page import="java.sql.*, oracle.jdbc.*, oracle.jdbc.pool.OracleDataSource" %>
<% if (request.getParameter("user")==null) { %>
<FORM method="post" action="testjdbc.jsp">
<H1>Enter connection Parameters</H1>
<H5>Please enter host name:</H5><INPUT TYPE="text" name="hostname" value="localhost" />
<H5>Please enter port number:</H5><INPUT TYPE="text" name="port" value="1521" />
<H5>Service nanme:</H5><INPUT TYPE="text" name="service" value="XE" />
<H5>Please enter username: </H5><INPUT TYPE="text" name="user" />
<H5>Please enter password</H5><INPUT TYPE="password" name="password" />
<INPUT TYPE="submit" />
</FORM>
<% } else { %>
<%
String hostName = request.getParameter("hostname");
String portNumber = request.getParameter("port");
String service = request.getParameter("service");
String user = request.getParameter("user");
String password = request.getParameter("password");
String url = "jdbc:oracle:thin:" + user + "/" + password + "@//" + hostName + ":" + portNumber + "/" + service;
try {
OracleDataSource ods = new OracleDataSource();
ods.setURL(url);
Connection conn = ods.getConnection();
// Create Oracle DatabaseMetaData object
DatabaseMetaData meta = conn.getMetaData();
// gets driver information
out.println("<TABLE>");
out.println("<TR><TD>");
out.println("<B>JDBC Driver version</B>");
out.println("</TD>");
out.println("<TD>");
out.println(meta.getDriverVersion());
out.println("</TD>");
out.println("</TR>");
out.println("<TR><TD>");
out.println("<B>JDBC Driver Name</B>");
out.println("</TD>");
out.println("<TD>");
out.println(meta.getDriverName());
out.println("</TD>");
out.println("</TR>");
out.println("<TR><TD>");
out.println("<B>JDBC URL</B>");
out.println("</TD>");
out.println("<TD>");
out.println(meta.getURL());
out.println("</TD>");
out.println("<TABLE>");
conn.close();
} catch (Exception e) {e.printStackTrace(); }
%>
<%-- end else if --%>
<% } %>
</BODY>
</HTML>

Similar Messages

Accessing a java class method from the jsp page.

Hi im a beginner with jsp and im trying to find a way to access a method of my java class file in jsp page. After searching through the forums i tried to use the usebean tag. Im using apache to host the jsp file.Below is an excerpt of my code and the error message i got. What am i doing wrong? anyone know?
<%@ page language="java" %>
<jsp:useBean id="movies" class="movie.Movie" />
<jsp:setProperty name="movies" property="*"/>
<%
movies.getStart("file:///C:/Video/Applications2/sun.mpg");
response.setContentType("text/xml");
%>
exception
org.apache.jasper.JasperException: Exception in JSP: /View.jsp:7
4: <jsp:setProperty name="movies" property="*"/>
5: <%
6:
7: movies.getStart("file:///C:/Video/Applications2/sun.mpg");
8: response.setContentType("text/xml");
9: %>
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: javax/media/ControllerListener

Hi thanks for responding. Ok i did look through and it was opening some gui. I still need the program to do server side processes so cant use an applet.but i dont need the gui so i revised it and removed the gui. also im using a servlet to call the class now yet i still have the same error. Any ideas?
Below is the vid2jpg code minus the gui.
import java.io.*;
import java.awt.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.protocol.*;
import java.awt.image.*;
import javax.imageio.*;
public class vid2jpg implements ControllerListener
     Processor p;
     Object waitObj = new Object();
     boolean stateOK = true;
     DataSourceHandler handler;
int imgWidth;int imgHeight;
     Image outputImage;
     String sep = System.getProperty("file.separator");
     int[] outvid;
     int startFr = 1;int endFr = 1000;int countFr = 0;
     boolean sunjava=true;
     * Static main method
     public static void main(String[] args)
          if(args.length == 0)
               System.out.println("No media address.");
               new vid2jpg("file:///C:/Video/applications2/sun.mpg");     // or alternative "vfw://0" if webcam
          else
               String path = args[0].trim();
               System.out.println(path);
               new vid2jpg(path);
     * Constructor
     public vid2jpg(String path)
          MediaLocator ml;String args = path;
          if((ml = new MediaLocator(args)) == null)
               System.out.println("Cannot build media locator from: " + args);
          if(!open(ml))
               System.out.println("Failed to open media source");
     * Given a MediaLocator, create a processor and start
     private boolean open(MediaLocator ml)
          System.out.println("Create processor for: " + ml);
          try
               p = Manager.createProcessor(ml);
          catch (Exception e)
               System.out.println("Failed to create a processor from the given media source: " + e);
               return false;
          p.addControllerListener(this);
          // Put the Processor into configured state.
          p.configure();
          if(!waitForState(p.Configured))
               System.out.println("Failed to configure the processor.");
               return false;
          // Get the raw output from the Processor.
          p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW));
          TrackControl tc[] = p.getTrackControls();
          if(tc == null)
               System.out.println("Failed to obtain track controls from the processor.");
               return false;
          TrackControl videoTrack = null;
          for(int i = 0; i < tc.length; i++)
               if(tc.getFormat() instanceof VideoFormat)
                    tc[i].setFormat(new RGBFormat(null, -1, Format.byteArray, -1.0F, 24, 3, 2, 1));
                    videoTrack = tc[i];
               else
               tc[i].setEnabled(false);
          if(videoTrack == null)
               System.out.println("The input media does not contain a video track.");
               return false;
          System.out.println("Video format: " + videoTrack.getFormat());
          p.realize();
          if(!waitForState(p.Realized))
               System.out.println("Failed to realize the processor.");
               return false;
          // Get the output DataSource from the processor and set it to the DataSourceHandler.
          DataSource ods = p.getDataOutput();
          handler = new DataSourceHandler();
          try
               handler.setSource(ods);     // also determines image size
          catch(IncompatibleSourceException e)
               System.out.println("Cannot handle the output DataSource from the processor: " + ods);
               return false;
     //     setLayout(new FlowLayout(FlowLayout.LEFT));
//          currPanel = new imgPanel(new Dimension(imgWidth,imgHeight));
     //     add(currPanel);
     //     pack();
          //setLocation(100,100);
     //     setVisible(true);
          handler.start();
          // Prefetch the processor.
          p.prefetch();
          if(!waitForState(p.Prefetched))
               System.out.println("Failed to prefetch the processor.");
               return false;
          // Start the processor
          //p.setStopTime(new Time(20.00));
          p.start();
          return true;
     * Sets image size
     private void imageProfile(VideoFormat vidFormat)
          System.out.println("Push Format "+vidFormat);
          Dimension d = (vidFormat).getSize();
          System.out.println("Video frame size: "+ d.width+"x"+d.height);
          imgWidth=d.width;
          imgHeight=d.height;
     * Called on each new frame buffer
     int nextframetime = 0;
private void useFrameData(Buffer inBuffer)
try
if(inBuffer.getData()!=null) // vfw://0 can deliver nulls
if(sunjava) // and with import javax.imageio.*;
int frametimesecs = (int)(inBuffer.getTimeStamp()/1000000000);
if(frametimesecs%10 == 0 && frametimesecs==nextframetime)
nextframetime+=10;
BufferedImage bi = new BufferedImage(outputImage.getWidth(null), outputImage.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
ImageIO.write(bi, "png", new File("images"+sep+"image_"+(inBuffer.getTimeStamp()/1000000000)+".png"));
catch(Exception e){}
     * Tidy on finish
     public void tidyClose()
          handler.close();
          p.close();
     * Block until the processor has transitioned to the given state
     private boolean waitForState(int state)
          synchronized(waitObj)
               try
                    while(p.getState() < state && stateOK)
                    waitObj.wait();
               catch (Exception e)
          return stateOK;
     * Controller Listener.
     public void controllerUpdate(ControllerEvent evt)
          if(evt instanceof ConfigureCompleteEvent ||     evt instanceof RealizeCompleteEvent || evt instanceof PrefetchCompleteEvent)
               synchronized(waitObj)
                    stateOK = true;
                    waitObj.notifyAll();
          else
          if(evt instanceof ResourceUnavailableEvent)
               synchronized(waitObj)
                    stateOK = false;
                    waitObj.notifyAll();
          else
          if(evt instanceof EndOfMediaEvent || evt instanceof StopAtTimeEvent)
               tidyClose();
     * Inner classes
     * A DataSourceHandler class to read from a DataSource and displays
     * information of each frame of data received.
     class DataSourceHandler implements BufferTransferHandler
          DataSource source;
          PullBufferStream pullStrms[] = null;
          PushBufferStream pushStrms[] = null;
          Buffer readBuffer;
          * Sets the media source this MediaHandler should use to obtain content.
          private void setSource(DataSource source) throws IncompatibleSourceException
               // Different types of DataSources need to handled differently.
               if(source instanceof PushBufferDataSource)
                    pushStrms = ((PushBufferDataSource) source).getStreams();
                    // Set the transfer handler to receive pushed data from the push DataSource.
                    pushStrms[0].setTransferHandler(this);
                    // Set image size
                    imageProfile((VideoFormat)pushStrms[0].getFormat());
               else
               if(source instanceof PullBufferDataSource)
                    System.out.println("PullBufferDataSource!");
                    // This handler only handles push buffer datasource.
                    throw new IncompatibleSourceException();
               this.source = source;
               readBuffer = new Buffer();
          * This will get called when there's data pushed from the PushBufferDataSource.
          public void transferData(PushBufferStream stream)
               try
                    stream.read(readBuffer);
               catch(Exception e)
                    System.out.println(e);
                    return;
               // Just in case contents of data object changed by some other thread
               Buffer inBuffer = (Buffer)(readBuffer.clone());
               // Check for end of stream
               if(readBuffer.isEOM())
                    System.out.println("End of stream");
                    return;
               // Do useful stuff or wait
               useFrameData(inBuffer);
          public void start()
               try{source.start();}catch(Exception e){System.out.println(e);}
          public void stop()
               try{source.stop();}catch(Exception e){System.out.println(e);}
          public void close(){stop();}
          public Object[] getControls()
               return new Object[0];
          public Object getControl(String name)
               return null;
below is the servlet code.
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ShowMovie extends HttpServlet {
String rootURL="http://127.0.0.1:8080/Video/";
public void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
     //String movie=request.getParameter("movie");
     String movie ="son";
     getStart(movie);
          response.sendRedirect(rootURL+"View.jsp");
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
     public void getStart(String url){
          new vid2jpg(url);
this is the error from the server. Im using tomkat 5
exception
javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.NoClassDefFoundError: javax/media/ControllerListener
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(Unknown Source)
     java.security.SecureClassLoader.defineClass(Unknown Source)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1812)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
     java.lang.ClassLoader.loadClassInternal(Unknown Source)
     ShowMovie.getStart(ShowMovie.java:31)
     ShowMovie.processRequest(ShowMovie.java:14)
     ShowMovie.doGet(ShowMovie.java:22)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.

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[email protected]

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Thanks,
Jim

Hi Jim,
If you want to pass the user credentials to the report dynamically, then SSO (Single Sign-On) is the only option I can think of.
If the user credentials can be hard-coded, then the following 2 solutions are possible:
1. Use cgicmd.dat file, and write the user credentials in the file.
2. In your report JSP itself, you could write the following:
<rw:report id="report" parameters="userid=scott/tiger@mydb">
Navneet.

How to call a .js file from a JSP in JSPDynpage

Hi ........I have a javascript file called set.js under the scripts folder .
I need to call this .js file from my JSP in a JSPDynpage Application.
Please help me do this..
Regards
Smita

Hi,
store your js file also under the jsp folder with a .jsp extension and then call it in your jsp page by an include statement. this was found working. later you may try with changing the extension to .js and try your luck:)
<%@ include file="set.jsp" %>
Chill,
Steel

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