Ajax,它使瀏覽器可以為用戶提供更為自然的瀏覽體驗,對于j2EE WEB開發人員來說,使用DWR框架可以很簡單的使用Ajax技術.
本文以一個DWR+SPRING的實例來說明DWR的使用
1、將dwr.jar放到應用的/WEB-INF/lib目錄下
2、配置web.xml,增加如下代碼:
-
- <context-param>
- <param-name>contextConfigLocation</param-name>
- <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/action-servlet.xml</param-value>
- </context-param>
- <listener>
- <listener-class>
- org.springframework.web.context.ContextLoaderListener
- </listener-class>
- </listener>
-
- <servlet>
- <servlet-name>dwr-invoker</servlet-name>
- <!-- 指定DWR核心Servlet的實現類 -->
- <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
- <init-param>
- <param-name>debug</param-name>
- <param-value>true</param-value>
- </init-param>
- </servlet>
- <servlet-mapping>
- <servlet-name>dwr-invoker</servlet-name>
- <url-pattern>/dwr/*</url-pattern>
- </servlet-mapping>
3、增中dwr.xml文件
文件內容：
- <?xml version="1.0" encoding="UTF-8"?>
- <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
- <dwr>
- <allow>
- <create creator="spring" javascript="DWRUser">
- <param name="beanName" value="DWRUser"/>
- </create>
- </allow>
- </dwr>
creator屬性的值可以是new,struts,spring......因為此處是整合spring來做的，所以設置成“spring”，javascript="DWRUser" 表示實例轉換成javascript語言后以DWRUser命名，前臺頁面可以通過代碼（<script src="../../dwr/interface/DWRUser.js" type="text/javascript"></script>）來調用。param元素的name屬性值可以是class,beanName等，此處用beanName,value得值是定義在applicationContext.xml中某個bean的id值。
4、創建一個實體bean供DWR轉換成js
- package com.note.dwr;
- import com.note.bussies.service.IUserService;
- public class User {
- private IUserService ius;
-
- public IUserService getIus() {
- return ius;
- }
- public void setIus(IUserService ius) {
- this.ius = ius;
- }
- public User(){
-
- }
- public boolean isExist(String username) {
- Users user = this.ius.getUserByName(username);
- return (null == user) ? false : true;
- }
- }
5、在applicationContext.xml中配置第4步寫的bean
- ......
- <bean id="DWRUser" class="com.note.dwr.User">
- <property name="ius">
- <ref bean="UserService" />
- </property>
- </bean>
- ......
6、在視圖頁面中調用
先導入以下文，每個文件的功能這里不再詳述
- <script type='text/javascript' src='../../dwr/interface/DWRUser.js'></script>
- <script type='text/javascript' src='../../dwr/engine.js'></script>
- <script type='text/javascript' src='../../dwr/util.js'></script>
因為我的視圖文件是放在/view/user/下，所以這里用了../../返回到根
具體調用：
-
<script type='text/javascript'>
function regUserChked(){
- var username=$("username").value;
- DWRUser.isExist(username,showData);//showData回調函數
- }
- function showData(data){
- if(data){
- DWRUtil.setValue("userMsg","該用戶名已經被注冊，請更換您的用戶名！");
- }else{
- DWRUtil.setValue("userMsg","恭喜您，該用戶名尚未被注冊！");
- }
- }
- </script>
- input type="text" name="username" value="" onblur="regUserChked()" /><div id="userMsg"></div>
posted on 2007-10-07 12:33
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