Tuesday, January 24, 2017

Spring MVC - Multiple Resolver Mapping Example

In case you want to use multiple view resolver in a spring mvc application then priority order can be set using order property. The following example show how to use ResourceBundleViewResolver and InternalResourceViewResolver both in Spring Web MVC framework.

TestWeb-servlet.xml
<bean class="org.springframework.web.servlet.view.ResourceBundleViewResolver">
   <property name="basename" value="views" />
   <property name="order" value="0" />
</bean>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   <property name="prefix" value="/WEB-INF/jsp/" />
   <property name="suffix" value=".jsp" />
   <property name="order" value="1" />
</bean>
  1. Here order property defines the ranking of view resolver. 0 as first resolver and 1 as next resolver and so on.
views.properties
hello.(class)=org.springframework.web.servlet.view.JstlView
hello.url=/WEB-INF/jsp/hello.jsp
For example, using above configuration, if URI
  1. /hello is requested, DispatcherServlet will forward the request to the hello.jsp defined by bean hello in views.properties.
To start with it, let us have working Eclipse IDE in place and follow the following steps to develop a Dynamic Form based Web Application using Spring Web Framework:
StepDescription
1Create a project with a name TestWeb under a package com.tutorialspoint as explained in the Spring MVC - Hello World Example chapter.
2Create a Java classes HelloController under the com.tutorialspoint package.
3Create a view file hello.jsp under jsp sub-folder.
4Create a properties file views.properties under src folder.
4Download JSTL library jstl.jar. Put it in your CLASSPATH.
5The final step is to create the content of all the source and configuration files and export the application as explained below.
HelloController.java
package com.tutorialspoint;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.ModelMap;

@Controller
@RequestMapping("/hello")
public class HelloController{
 
   @RequestMapping(method = RequestMethod.GET)
   public String printHello(ModelMap model) {
      model.addAttribute("message", "Hello Spring MVC Framework!");

      return "hello";
   }

}
TestWeb-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   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="com.tutorialspoint" />

   <bean class="org.springframework.web.servlet.view.ResourceBundleViewResolver">
      <property name="basename" value="views" />
      <property name="order" value="0" />
   </bean>
   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix" value="/WEB-INF/jsp/" />
      <property name="suffix" value=".jsp" />
      <property name="order" value="1" />
   </bean>
</beans>
views.properties
hello.(class)=org.springframework.web.servlet.view.JstlView
hello.url=/WEB-INF/jsp/hello.jsp
hello.jsp
<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<title>Hello World</title>
</head>
<body>
   <h2>${message}</h2>
</body>
</html>
Once you are done with creating source and configuration files, export your application. Right click on your application and use Export > WAR File option and save your HelloWeb.war file in Tomcat's webapps folder.
Now start your Tomcat server and make sure you are able to access other web pages from webapps folder using a standard browser. Now try to access the URL http://localhost:8080/HelloWeb/hello and if everything is fine with your Spring Web Application, you should see the following result:
Spring Internal Resource View Resolver
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