Hi javaAddicts
I am a novice java programmer.
I am in a learning process in java servlets.
How to load a servlet and invoke its method from index.jsp.
I want the servlet to execute first and dispatch its value to index.jsp
and also i dont want to use redirect from jsp and again dispatching the values from servlet.
Is there is a way to access it.
This is an simple approach to dispatch a value to index.jsp
index.html:
<html>
<body>
<h1 align="center">Select Person</h1>
<form method="POST" action="Person.do">
<select name="person" size="1">
<option value="a@example.com">Fred</option>
</select>
<br><br>
<center><input type="Submit"></center>
</form>
</body></html>result.jsp:
<p>
<%
// request email from servlet
String email = (String)request.getAttribute("email");
// print email
out.println("<br>"+email);
%>
</p>Person.java:
package com.example;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class Person extends HttpServlet
{
public void doPost (HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
String p = request.getParameter("person");
// display email stored in web.xml
PrintWriter out = response.getWriter();
request.setAttribute("email", p);
RequestDispatcher view = request.getRequestDispatcher("result.jsp");
view.forward(request, response);
}
}web.xml (stored inside WEB-INF):
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Person Servlet Example</display-name>
<servlet>
<servlet-name>Person</servlet-name>
<servlet-class>com.example.Person</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Person</servlet-name>
<url-pattern>/Person.do</url-pattern>
</servlet-mapping>
</web-app>Thanks for the reply but i dont need to send the form data s into the servlets.
On visiting my site's index.jsp (ie. on running the project the first page what i see) should make a call to a servlet and dispatch its value to index.jsp
for example, if i want to list out all the existing users in index.jsp what i should do now.
why no write Java class and call it object there?
class HelpJava{
public void printMe(String name, PrintWriter out){
out.print('Hello: '+name);
}
}<%
PrintWriter out = request.getPrintWriter();
HelpJava obj = new HelpJava();
obj.printMe("Stefano", out);
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