Configuration of Dwr 3 with Spring 3.0

If you are using spring MVC then 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>SpringDwr</display-name>

  <servlet>

    <servlet-name>springdwr</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet- class>

    <load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

    <servlet-name>springdwr</servlet-name>

    <url-pattern>*.html</url-pattern>

</servlet-mapping>

 <servlet-mapping>

  <servlet-name>springdwr</servlet-name>

  <url-pattern>/dwr/*</url-pattern>

</servlet-mapping>

 <welcome-file-list>

        <welcome-file>add.jsp</welcome-file>

</welcome-file-list>

           

</web-app>

You will not require to have dwr.xml.

Along with the spring configuration in your application-servlet.xml following entries will be done:

<?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"

      xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"

      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.directwebremoting.org/schema/spring-dwr  http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd">

<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />

   

<!-- DWR will scan all Spring managed beans containing @RemoteProxy or

     @RemoteMethod annotations and register Creator proxies for them.

     This will NOT scan any classes not managed by Spring. -->

      <dwr:annotation-config id="springdwr" />

<!-- DWR will scan the classpath and search classes containing @RemoteProxy                                                                                                                                                                                                            or @RemoteMethod annotations. This will register the beans and Creator proxies for these classes.-->

      <dwr:annotation-scan base package="com.springdwr.controller,com.springdwr.service" scanDataTransferObject="true" scanRemoteProxy="true" />

      <!-- DWR will map util.js and engine.js files to the dwrController. You can then include this files as external Javascript references from your JSP -->

      <dwr:url-mapping />

      <!-- Defines the dwrController. During production, set the debug property to false -->

      <dwr:controller id="dwrController" debug="true" />

<!-- This is required if you want to configure any beans not managed by Spring. Leaving it enabled doesn't do any negative effects. Here's a sample config: -->

      <dwr:configuration />

      <context:component-scan base-package="com.springdwr.*" />

The class which will be used:

package com.springdwr.service;

import org.directwebremoting.annotations.RemoteMethod;

import org.directwebremoting.annotations.RemoteProxy;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

/**

 * @Service enables the class to be used as a Spring service

 * @RemoteProxy enables the class to be used as a DWR service

 * @Transactional enables transaction support for this clas

 */

@Service("springService")

@RemoteProxy(name="dwrService")

@Transactional

public class ArithmeticService {

      /**

       * @RemoteMethod exposes this method to DWR.

       * Your JSP pages can access this method as Javascript

       * Your Spring beans can still access this method.

       */

      @RemoteMethod

      public Integer add(Integer value1, Integer value2) {

            return value1+ value2;

      }

     

}

The JSP :

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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=UTF-8">

 <script type='text/javascript' src="/SpringDwr/dwr/engine.js"></script>

 <script type='text/javascript' src="/SpringDwr/dwr/util.js"></script>

 <script type="text/javascript" src="/SpringDwr/dwr/interface/dwrService.js"></script>     

      <title>Spring 3.0 MVC – DWR 3.0 Integration Tutorial</title>

</head>

<body>

<h3>3.0 MVC – DWR 3.0 Integration Tutorial</h3>

<div style="border: 1px solid #000; width: 3000px;">

      Add Two Numbers: <br/>

      <input id="num1" type="text" size="5"> +

      <input id="num2" type="text" size="5">

      <input type="submit" value="Add" onclick="add()" /> <br/>

      Sum: <span id="sum">(Result will be shown here)</span>

</div>

<script type="text/javascript">

      function add() {

            // Retrieve the value of text inputs

            var operand1 = dwr.util.getValue("num1");

            var operand2 = dwr.util.getValue("num2");

           

            // Pass two numbers, a callback function, and error function

            dwrService.add(operand1, operand2, {

                  callback : handleAddSuccess,

                  errorHandler : handleAddError

            });

      }

      // data contains the returned value

      function handleAddSuccess(data) {

            // Assigns data to result id

            dwr.util.setValue("sum", data);

      } 

      function handleAddError() {

            // Show a popup message

            alert("Can't add the values!");

      }

</script>

</body>

</html>