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JavaInterviewPoint

Java Development Tutorials

Spring MVC BeanNameUrlHandlerMapping Example

April 14, 2015 by javainterviewpoint 2 Comments

HandlerMapping is an Interface to be implemented by objects that define a mapping between requests and handler objects. By default DispatcherServlet uses BeanNameUrlHandlerMapping and DefaultAnnotationHandlerMapping. In Spring MVC we majorly use the below handler mappings

  1. BeanNameUrlHandlerMapping
  2. ControllerClassNameHandlerMapping
  3. SimpleUrlHandlerMapping

Let’s take BeanNameUrlHandlerMapping in this article. Here we will be mapping each request to a Bean directly like below

<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
     <bean name="/helloWorld.htm" 
          class="com.javainterviewpoint.HelloWorldController" />
     <bean name="/hello*.htm" 
         class="com.javainterviewpoint.HelloWorldController" />  

Here we can see we have mentioned the Spring container to use BeanNameUrlHandlerMapping and we have mapped each possible request to a controller.

Folder Structure :

  1. Create a Dynamic Web Project “SpringMVCHandlerMappingTutorial” and create a package for our src files “com.javainterviewpoint“
  2. Place the Spring 3 jar files under WEB-INF/Lib 

    commons-logging-1.1.1.jar
    log4j-1.2.16.jar
    slf4j-api-1.7.5.jar
    slf4j-log4j12-1.7.5.jar
    spring-aspects-3.2.4.RELEASE.jar
    spring-beans-3.2.4.RELEASE.jar
    spring-context-3.2.4.RELEASE.jar
    spring-core-3.2.4.RELEASE.jar
    spring-expression-3.2.4.RELEASE.jar
    spring-web-3.2.4.RELEASE.jar
    spring-webmvc-3.2.4.RELEASE.jar

  3. Create the Java classes HelloWorldController.java and WelcomeController.java under com.javainterviewpoint folder.
  4. Place the SpringConfig-servlet.xml and web.xml  under the WEB-INF directory
  5. View files helloWorld.jsp and welcome.jsp are put under the sub directory under WEB-INF/Jsp

HelloWorldController.java

Our HelloWorldController class extends AbstractController class and overrides “handleRequestInternal()” method. Inside the method, we will create a ModelAndView object which has the redirecting page(helloWorld) and user passes a String which will be used on the view page.

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class HelloWorldController extends AbstractController
{

    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.out.println("Inside HelloWorldController");
        ModelAndView model = new ModelAndView("helloWorld");
        model.addObject("msg", "JavaInterviewPoint");
        
        return model;
    }
}

WelcomeController.java

WelcomeController is almost the same as HelloWorldController except the redirecting page and the String passed.

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class WelcomeController extends AbstractController
{
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.out.println("Inside WelcomeController");

        ModelAndView model = new ModelAndView("welcome");
        model.addObject("msg", "JavaInterviewPoint");
        
        return model;
    }
}

helloWorld.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
       <title>Insert title here</title>
    </head>
    <body>
       <h2>Hello World ${msg}</h2> 
    </body>
</html>

welcome.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
        <title>Insert title here</title>
    </head>
    <body>
        <h2> Welcome to ${msg}</h2>
    </body>
</html>

web.xml

The web.xml has everything about the application that a server needs to know, which is placed under the WEB-INF directory. <servlet-name> contains the name of the SpringConfiguration, when the DispatcherServlet is initialized the framework will try to load a configuration file “[servlet-name]-servlet.xml” under the WEB-INF directory.

<?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>SpringMVCFormHandling</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name>SpringConfig</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>SpringConfig</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

SpringConfig-servlet.xml

  • The SpringConfig-servlet.xml is also placed under the WEB-INF directory.
  • Here we have configured BeanNameUrlHandlerMapping as the HandlerMapping
  • Each request is mapped to a Controller as well
<beans xmlns="http://www.springframework.org/schema/beans" 
xmlns:context="http://www.springframework.org/schema/context" 
xmlns:mvc="http://www.springframework.org/schema/mvc" 
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	
http://www.springframework.org/schema/mvc	http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> 
 
      <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/WEB-INF/Jsp/"/>
         <property name="suffix" value=".jsp"/>
     </bean>
 
      <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
 
     <bean name="/helloWorld.htm" 
         class="com.javainterviewpoint.HelloWorldController" />
 
     <bean name="/hello*" 
         class="com.javainterviewpoint.HelloWorldController" /> 

     <bean name="/welcome.htm"
         class="com.javainterviewpoint.WelcomeController"/>
 
</beans>

In the above example where ever

  • helloWorld.htm is requested, the DispatcherServlet redirects it to the HelloWorldController.
  • hello123 is requested, the DispatcherServlet redirects it to the HelloWorldController.
  • welcome.htm is requested, the DispatcherServlet redirects it to the WelcomeController.
  • welcome123 is requested, you will get 404 error as there is no mapping for it.

Output

when HelloWorldController called

Hello World JavaInterviewPoint

when WelcomeController called

Welcome to JavaInterviewPoint

Other interesting articles which you may like …

  • Spring 3 MVC Hello World Example
  • Spring MVC Form Handling Example
  • Spring MVC Form Validation Tutorial (With Annotations)
  • Spring MVC Form Validation -Annotations and ResourceBundle
  • Spring MVC Exception Handling @ExceptionHandler
  • Spring MVC Exception Handling @ControllerAdvice and @ExceptionHandler
  • Spring MVC Custom Exception Handling
  • Spring MVC Textbox Example
  • Spring MVC Password Example
  • Spring MVC Dropdown Box Example
  • Spring MVC Checkbox And Checkboxes Example
  • Spring MVC Radiobutton And Radiobuttons Example
  • Spring MVC TextArea Example
  • Spring MVC HiddenValue Example

Filed Under: J2EE, Java, Spring, Spring MVC, Spring Tutorial Tagged With: BeanNameUrlHandlerMapping, HandlerMapping, Spring MVC

Comments

  1. venkatesh says

    February 8, 2016 at 7:19 pm

    i am learning spring mvc from your site, but while i am run this application i am getting bellow errore ,but there is no red marks in my code,but my code not execute, i am using latest jar files what ever you mention.

    HTTP Status 404 – /SpringMVCHandlerMapping1/

    ——————————————————————————–

    type Status report

    message /SpringMVCHandlerMapping1/

    description The requested resource is not available.

    SEVERE: IOException while saving persisted sessions: java.io.FileNotFoundException: C:\Users\p\Downloads\Workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\work\Catalina\localhost\Spring_mvc\SESSIONS.ser (The system cannot find the path specified)
    java.io.FileNotFoundException: C:\Users\p\Downloads\Workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\work\Catalina\localhost\Spring_mvc\SESSIONS.ser (The system cannot find the path specified)
    at java.io.FileOutputStream.open0(Native Method)
    at java.io.FileOutputStream.open(FileOutputStream.java:270)
    at java.io.FileOutputStream.(FileOutputStream.java:213)
    at java.io.FileOutputStream.(FileOutputStream.java:101)
    at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:501)
    at org.apache.catalina.session.StandardManager.unload(StandardManager.java:470)
    at org.apache.catalina.session.StandardManager.stop(StandardManager.java:679)
    at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4886)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3458)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1364)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1656)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1665)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1665)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1645)
    at java.lang.Thread.run(Thread.java:745)

    Feb 08, 2016 7:07:07 PM org.apache.catalina.session.StandardManager stop
    SEVERE: Exception unloading sessions to persistent storage
    java.io.FileNotFoundException: C:\Users\p\Downloads\Workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\work\Catalina\localhost\Spring_mvc\SESSIONS.ser (The system cannot find the path specified)
    at java.io.FileOutputStream.open0(Native Method)
    at java.io.FileOutputStream.open(FileOutputStream.java:270)
    at java.io.FileOutputStream.(FileOutputStream.java:213)
    at java.io.FileOutputStream.(FileOutputStream.java:101)
    at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:501)
    at org.apache.catalina.session.StandardManager.unload(StandardManager.java:470)
    at org.apache.catalina.session.StandardManager.stop(StandardManager.java:679)
    at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4886)
    at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3458)
    at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1364)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1656)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1665)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1665)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1645)
    at java.lang.Thread.run(Thread.java:745)

    ——————————————————————————–

    Apache Tomcat/6.0.44

    Reply
    • javainterviewpoint says

      February 9, 2016 at 9:49 am

      Venkatesh
      It seems to be a tomcat issue which you used along with eclipse. Try re-installing it and let me know.

      Reply

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