內(nèi)容: DWR - Direct Web Remoting 實(shí)際使用原創(chuàng):magicgod版權(quán)聲明：可以任意轉(zhuǎn)載，轉(zhuǎn)載時(shí)請(qǐng)務(wù)必以超鏈接形式標(biāo)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(méi)實(shí)際用過(guò)，趁著DWR出來(lái)用一把。用在一個(gè)很簡(jiǎn)單的地方，就是檢查是否有重復(fù)的名稱(chēng)。首先寫(xiě)好一個(gè)類(lèi)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(gè)類(lèi)，對(duì)應(yīng)于js中哪一個(gè)類(lèi)，基本上象一個(gè)bean管理器。在jsp中先引入js<script type='text/javascript' src='http://m.4tl426be.cn/bcjs/<%=request.getContextPath()%>/dwr/interface/CommonServices.js'></script><script type='text/javascript' src='http://m.4tl426be.cn/bcjs/<%=request.getContextPath()%>/dwr/engine.js'></script><script type='text/javascript' src='http://m.4tl426be.cn/bcjs/<%=request.getContextPath()%>/dwr/util.js'></script>前兩個(gè)是必須的。CommonServices.js會(huì)動(dòng)態(tài)生成，根據(jù)dwr.xml。寫(xiě)一些方法:function showResult(b){if(b){alert('已經(jīng)有重復(fù)的登錄名了！');}else{alert('登錄名尚未注冊(cè)過(guò)！');}}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(gè)文本框的對(duì)象名，取出內(nèi)容，調(diào)用后臺(tái)CommonServices，根據(jù)返回值顯示結(jié)果。showResult:回調(diào)函數(shù)，處理后臺(tái)CommonServices的返回結(jié)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(diào)？getElement:自定義的實(shí)用工具函數(shù)定義一下按鈕:<input type='button' onclick='checkRepeat('user.loginname')' value='檢查是否重復(fù)'>這樣點(diǎn)一個(gè)按鈕之后就會(huì)彈出對(duì)話框，顯示是否重復(fù)的信息。調(diào)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(shí)際使用原創(chuàng):magicgod版權(quán)聲明：可以任意轉(zhuǎn)載，轉(zhuǎn)載時(shí)請(qǐng)務(wù)必以超鏈接形式標(biāo)明文章原始出處和作者信息及本聲明mag