內容: DWR - Direct Web Remoting 實際使用原創:magicgod版權聲明：可以任意轉載，轉載時請務必以超鏈接形式標明文章原始出處和作者信息及本聲明magicgod的blog:' target='_new'>http://www.matrix.org.cn/blog/magicgod/ajax喊了好多年，還沒實際用過，趁著DWR出來用一把。用在一個很簡單的地方，就是檢查是否有重復的名稱。首先寫好一個類public class CommonServices{public boolean checkRepeatUser(String loginname){boolean result=false;...省去具體代碼return result;}}在web.xml中加上dwr-invokerDWR Servletuk.ltd.getahead.dwr.DWRServletdebugtruedwr-invoker/dwr/*在WEB-INF/dwr.xml中<?xml version='1.0' encoding='UTF-8'?> dwr PUBLIC '//GetAhead Limited//DTD Direct Web Remoting 1.0//EN' 'http://www.getahead.ltd.uk/dwr/dwr10.dtd'>這是配一個類，對應于js中哪一個類，基本上象一個bean管理器。在jsp中先引入js<script type='text/javascript' src='http://www.gepszalag.com/bcjs/<%=request.getContextPath()%>/dwr/interface/CommonServices.js'></script><script type='text/javascript' src='http://www.gepszalag.com/bcjs/<%=request.getContextPath()%>/dwr/engine.js'></script><script type='text/javascript' src='http://www.gepszalag.com/bcjs/<%=request.getContextPath()%>/dwr/util.js'></script>前兩個是必須的。CommonServices.js會動態生成，根據dwr.xml。寫一些方法:function showResult(b){if(b){alert('已經有重復的登錄名了！');}else{alert('登錄名尚未注冊過！');}}function checkRepeat(s){var o=getElement(s);if(o){CommonServices.checkRepeatUser(o.value,showResult);}}function getElement(name){var result=null;var objs=document.getElementsByName(name);if(objs){var o=objs[0];result=o;}return result;}checkRepeat:傳入一個文本框的對象名，取出內容，調用后臺CommonServices，根據返回值顯示結果。showResult:回調函數，處理后臺CommonServices的返回結果。不知道為什么要用這種方式，干脆直接返回值不是挺好？還需要用回調？getElement:自定義的實用工具函數定義一下按鈕:<input type='button' onclick='checkRepeat('user.loginname')' value='檢查是否重復'>這樣點一個按鈕之后就會彈出對話框，顯示是否重復的信息。調用的大致流程是這樣的：button->checkRepeat->CommonServices.js->engine.js->dwr servlet->CommonServices.java->DB Java, java, J2SE, j2se, J2EE, j2ee, J2ME, j2me, ejb, ejb3, JBOSS, jboss, spring, hibernate, jdo, struts, webwork, ajax, AJAX, mysql, MySQL, Oracle, Weblogic, Websphere, scjp, scjd DWR - Direct Web Remoting 實際使用原創:magicgod版權聲明：可以任意轉載，轉載時請務必以超鏈接形式標明文章原始出處和作者信息及本聲明mag