January 28, 2015

Java Spring MVC hello World Example in Eclipse


Java Spring Model View Controller Hello World Example in Eclipse


Description : In this post we are sharing only source code for java spring application, For theoretical note you can refer this site I could nt provide a better description on java spring than this. Please note the deployment descriptor (web.xml) where we had provide the name index.jsp as our welcome file.

index page (index.jsp)

<html>
<head>
 <title>Office Management System</title>
</head>
<body>
<a href="hello.html">Click here</a>
</body>
</html>

Deployment Descriptor (web.xml)

<?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>CfedOMS</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
 <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>
</web-app>


spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd">
       <context:component-scan base-package="net.cfed.oms.controller" />
   <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

JSTL (Java Standard Tag Library) : Expression Language ( EL) makes it possible to easy access application data stored in java bean.
Format : ${expression}

hello.jsp

<html>
<head> <title> This is my First application in Java Spring MVC </title></head>
<body>  ${message} </body>
</html>

What and Why annotation in java ?
Annotation allows implemented class to be auto-detected during class path spanning.
format : @component

RequestMapping is most used annotation method in java spring. It is used to map web request to a specific handler method. Here ModelAndViewHelloWorld Method. This concept is similar to java jsp servlets

Controller it indicates that the annotated class is a controller i e a web controller. 

HelloworldController.java

package net.cfed.oms.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloWorldController {

    @RequestMapping("/hello")
    public ModelAndView helloWorld() {
        String message = "Hello, This is my first sample spring MVC project !";
        System.out.println(message);
        return new ModelAndView("hello", "message", message);
    }

}


Project structure


Why should i choose java spring ?
Once you configured java spring, you can easily work on the business logic of your application.

http://javabelazy.blogspot.in/

Facebook comments