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>
