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Home > Programm > DWR primary study

DWR primary study

July 23rd, 2008 Loser Leave a comment Go to comments

DWR is a can allow you to create AJAX WEB site JAVA open-source library. It can let you in the browser's Javascript code on the Web server called the Java code, like Java code in a browser on the same.
HelloWorld example:
1.web.xml
<servlet>
<servlet-name> dwr-invoker </ servlet-name>
<servlet-class> org.directwebremoting.servlet.DwrServlet </ servlet-class>
<init-param>
<param-name> debug </ param-name>
<param-value> true </ param-value>
</ init-param>
<init-param>
<param-name> crossDomainSessionSecurity </ param-name>
<param-value> false </ param-value>
</ init-param>
</ servlet>
<servlet-mapping>
<servlet-name> dwr-invoker </ servlet-name>
<url-pattern> / dwr / * </ url-pattern>
</ servlet-mapping>


2.dwr.xml
<dwr>
<allow>
<create creator="new" javascript="helloWorld">
<param name="class" value= "com.HelloWorld" />
</ create>
</ allow>
</ dwr>

3. HelloWorld class preparation
package com;

public class HelloWorld (
public String sayHello (String yourName) (
return "Hello World" + yourName;
)
)

4. Preparation of a jsp
<html>
<head>
<script type="text/javascript" src='js/util.js'> </ script>
<script type="text/javascript" src='js/engine.js'> </ script>
<script type="text/javascript" src='dwr/interface/helloWorld.js'> </ script>

<script type="text/javascript">
function firstDwr () (
helloWorld.sayHello ( "ucatch", callBackHello);
)
function callBackHello (data) (
return alert (data);
)
</ script>
</ head>
<body>
<input type="button" name="button" value="测试" onclick="firstDwr()">
</ body>
</ html>

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