Use Spring 3.0 into your Servlet based application (No MVC framewrok plugin only Servlet/Jsp application)
Note : Spring3.0 is also having support to use annotation based configuration unlike configuration file based support in earlier version of Spring
Step 1: Create a Service Class Calculator
public class Calculator {
private String sum;
public Double add(String one , String two){
sum = parseDouble(one) + parseDouble(two);
}
public String getSum(){
return sum;
}
}
Step 2: Create a Class MySpringConfig to use annotation based configuration
package com.spring.web.config;
import org.springframework.context.annotation.*;
@Configuration
public class MySpringConfig {
@Bean()
@Scope(value="request")
public Calculator calculator() { return new Calculator(); }
}
Step 3: Use following contextListeners and Custom Configurations class into your web.xml (deployment descriptor)
as below :
<listener>
<listener-class>
org.springframework.web.context.request.RequestContextListener
</listener-class>
</listener>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<context-param>
<param-name>contextClass</param-name>
<param-value>
org.springframework.web.context.support.AnnotationConfigWebApplicationContext
</param-value>
</context-param>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>com.spring.web.config.MySpringConfig</param-value>
</context-param>
Step 4: Use following code to load calculator instance form the Spring configuration into your JSP scriplet or in your servlet
ApplicationContext beanFactory =
WebApplicationContextUtils
.getRequiredWebApplicationContext(getServletContext());
Calculator calc =
(Calculator)beanFactory
.getBean("calculator", Calculator.class);
String clickedButton = request.getParameter("command");
String num1= request.getParameter("num1");
String num2= request.getParameter("num2");
if (clickedButton != null && clickedButton.equals("add")) { calc.add(calc.add()); }
Step 5 : HTML code
<html>
<body>
<form action="index.jsp">
<input type="text" name="num1">
<input type="text" name="num2">
<input type="submit" name="command" value="ClickToCount!">
</form>
Sum : <%=calc.getSum()%>
</body>
</html>
Now Your app is ready with Spring 3.0 and simple JSP Servlet web application
Cheers
Kapil
Above steps are very effective to learn spring 3.0 into your servlet based app. After 2 hours searching i get these important steps from this page. event app iphone
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