Java Code Guru Ji (8920128728): Spring MVC Multiple Controller Example

Sunday, September 15, 2019

Spring MVC Multiple Controller Example

In Spring MVC, we can create multiple controllers at a time. It is required to map each controller class with @Controller annotation. Here, we see a Spring MVC example of multiple controllers. The steps are as follows:

Load the spring jar files or add dependencies in the case of Maven
Create the controller class
Provide the entry of controller in the web.xml file
Define the bean in the separate XML file
Create the other view components
Start the server and deploy the project

Directory Structure of Spring MVC

1. Add dependencies to pom.xml

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->  
<dependency>  
    <groupId>org.springframework</groupId>  
    <artifactId>spring-webmvc</artifactId>  
    <version>5.1.1.RELEASE</version>  
</dependency>  
  
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->  
<dependency>    
    <groupId>javax.servlet</groupId>    
    <artifactId>servlet-api</artifactId>    
    <version>3.0-alpha-1</version>    
</dependency>  

2. Create the request page

Let's create a simple JSP page containing two links.

index.jsp

<html>  
<body>  
<a href="hello1">Spring MVC</a> ||  
<a href="hello2">Spring Boot</a>  
</body>  
</html>  

3. Create the controller class

Let's create two controller classes, where each returns the particular view page.

HelloController1.java

package com.javatpoint;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloController1 {
@RequestMapping("/hello1")
public String display()
{
return "viewpage1";
}
}

HelloController2.java

package com.javatpoint;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloController2 {
@RequestMapping("/hello2")
public String display()
{
return "viewpage2";
}
}

4. Provide the entry of controller in the web.xml file

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" 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>SpringMVC</display-name>  
   <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>/</url-pattern>    
</servlet-mapping>    
</web-app>  

5. Define the bean in the xml file

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:context="http://www.springframework.org/schema/context"  
    xmlns:mvc="http://www.springframework.org/schema/mvc"  
    xsi:schemaLocation="  
        http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd  
        http://www.springframework.org/schema/context  
        http://www.springframework.org/schema/context/spring-context.xsd  
        http://www.springframework.org/schema/mvc  
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">  
  
    <!-- Provide support for component scanning -->  
    <context:component-scan base-package="com.javatpoint" />  
  
    <!--Provide support for conversion, formatting and validation -->  
    <mvc:annotation-driven/>  
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <property name="prefix" value="/WEB-INF/jsp/"></property>  
        <property name="suffix" value=".jsp"></property>          
     </bean>  
</beans>  

6. Create the other view components

viewpage1.jsp

<html>  
<body>  
<p>Welcome to Spring MVC Tutorial</p>  
</body>  
</html>  

viewpage1.jsp

<html>  
<body>  
<p>Welcome to Spring Boot Tutorial</p>  
</body>  
</html>  

Output:

Java Code Guru Ji (8920128728)