struts2+ajax的应用

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首先要把dwr的jar包导入到工程里面

然后配置dwr配置文件

内容如下

<?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="new" javascript="validator"> <param name="class" value="org.apache.struts2.validators.DWRValidator"/> </create> <convert converter="bean" match="com.opensymphony.xwork2.ValidationAwareSupport"/> </allow> <signatures>  </signatures></dwr>

然后在web.xml里面配置如下代码：

<servlet> <servlet-name>dwr</servlet-name> <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</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping>

写一个公用的ajax.js，代码如下：

var xmlHttp;function GetMSXmlHttp(){var clsids = ["Msxml2.XMLHTTP.6.0","Msxml2.XMLHTTP.5.0","Msxml2.XMLHTTP.4.0","Msxml2.XMLHTTP.3.0","Msxml2.XMLHTTP.2.6","Microsoft.XMLHTTP.1.0", "Microsoft.XMLHTTP.1","Microsoft.XMLHTTP"];/**var clsids=['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', "Msxml2.XMLHTTP.2.6","Microsoft.XMLHTTP.1.0","Microsoft.XMLHTTP.1","Microsoft.XMLHTTP"];**/for(var i=0; (i<clsids.length) && xmlHttp == null; i++) {xmlHttp = CreateXmlHttp(clsids[i]);}return xmlHttp;}function CreateXmlHttp(clsid) {try {xmlHttp = new ActiveXObject(clsid);lastclsid = clsid;return xmlHttp;}catch(e) {}}function GetXmlHttpObject(){ var objXmlHttp = null;if(window.ActiveXObject){ objXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}else if(window.ActiveXObject){ objXmlHttp = new ActiveXObject("Msxml2.XMLHTTP.4.0");}else if(window.ActiveXObject){ objXmlHttp = new ActiveXObject("Msxml2.XMLHTTP");}else if(window.XMLHttpRequest){ objXmlHttp = new XMLHttpRequest();}else{objXmlHttp = GetMSXmlHttp();}/**if (window.XMLHttpRequest){objXmlHttp = new XMLHttpRequest();} else{objXmlHttp = GetMSXmlHttp();}**/return objXmlHttp; } function loadXMLDoc(url,methods) {req=GetXmlHttpObject(); if(req) { req.onreadystatechange = methods; req.open('POST', url, false); req.send(''); }}

在调用的时候如下：

java代码返回数据：

public class LinkAction extends PublicAction {/*** 检查顺序号是否存在* @return* @author:*/public String checkranknum(){String ranknum=request.getParameter("ranknum");Link checklink=linkBus.checkranknum(new Long(ranknum));try { ServletActionContext.getResponse().setContentType("text/html;charset=utf-8");PrintWriter out = response.getWriter();if(checklink==null){ out.println(0);}else{ out.println(1);} out.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}}

jsp页面：