This program is developed in Tomcat7 Eclipse EE
program purpose: Find the cat by its name
index.html - has a input box that requires the name of the cat
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="findcat.do" method="post">
Cat name: <input type="text" name="name" /><br />
<input type="submit" >
</form>
</body>
</html>web.xml - the Deployment Descriptor for this program, maps findcat.do to com.example.web.FindCat
<?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_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>UseBean</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>CatFinder</servlet-name>
<servlet-class>com.example.web.FindCat</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CatFinder</servlet-name>
<url-pattern>/findcat.do</url-pattern>
</servlet-mapping>
</web-app>FindCat.java - The Controler, it is a class that extends HttpServletoverrides the doPost method. if the cat's name is John, return John and its age 2 if the name is Kitty, return Kitty and its age 3.
The Cat is send to result.jsp
package com.example.web;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.example.model.Cat;
public class FindCat extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String catName = req.getParameter( "name");
Cat foundCat = new Cat();
if( catName.equals("John" ) ) {
foundCat.setName("John" );
foundCat.setAge( 2 );
}else if( catName.equals("Kitty") ) {
foundCat.setName("Kitty" );
foundCat.setAge( 3 );
}
RequestDispatcher rd = getServletContext().getRequestDispatcher("/result.jsp");
System.out.println( "foundCat name: " + foundCat.getName() );
System.out.println( "foundcat age: " + foundCat.getAge() );
req.setAttribute("foundCat", foundCat);
rd.forward( req, resp);
}
}
Cat.java - the Model
package com.example.model;
import java.io.Serializable;
public class Cat implements Serializable {
String name;
int age;
public Cat(){
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
result.jsp - The View
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<jsp:useBean id="foundCat" class="com.example.model.Cat" scope="request" />
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Cats found</title>
</head>
<body>
<%
if( foundCat.getName() == null ){
%>
<h1>sorry, can not find this cat</h1>
<%
}else{
%>
Name: <jsp:getProperty name="foundCat" property="name" />
Age: <jsp:getProperty name="foundCat" property="age" />
<%
}
%>
</body>
</html>Structure of program
