Simple Application

-먼저 struts2_ajax라는  Tomcat 프로젝트 작성
-Commons-logging, freemarker, ognl, struts2-core, xwork, log4j 라이브러리를 적절히 추가
-[web.xml] 

<?xml version="1.0" encoding="UTF-8"?>

<web-app id="WebApp_9" version="2.4"

          xmlns="http://java.sun.com/xml/ns/j2ee"

          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

          xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

                              http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Struts2 HelloWorld</display-name>

    <filter>

        <filter-name>struts2</filter-name>

        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>

    </filter>

    <filter-mapping>

    <filter-name>struts2</filter-name>

    <url-pattern>/*</url-pattern>

    </filter-mapping>

</web-app>​

​

​
[/ajax.js]
var AutoComplete = {
        xmlHttp : null,
        /* XMLHttp객체생성/
        getXMLHttpRequest: function() {
if(window.ActiveXObject){//인터넷 익스플로러일 경우
                          try{  return new ActiveXObject("Msxml2.XMLHTTP");
                          }catch(e){
                                  try{
                                          return new ActiveXObject("Microsoft.XMLHTTP");
                                   }catch(e1){
                                           return null;
                                }
                        }
                }
                 //다른 브라우저일 경우
                else if(window.XMLHttpRequest){   return new XMLHttpRequest();         }
                //브라우저 식별 실패
                 else{                         return null;                }
        },

​

​

         /* XMLHttp Request를 서버로 */
        ContentLoader: function(url, execFunction) {
                 xmlHttp = this.getXMLHttpRequest();
                 xmlHttp.onreadystatechange = execFunction;
                 xmlHttp.open("POST", url, true); // url의 주소를 GET방식으로 열 준비를 한다.
                xmlHttp.send(); //서버에 전송한다.
        },
        /* XMLHttp Response가 서버로 부터 온전한 상태로 왔는지 확인   */
        getState: function() {
                if(xmlHttp.readyState == 4){ //데이터의 전부를 받은 상태
                        if(xmlHttp.status == 200){//요청 성공
                                   return true;
                          }else{
                                  return false;
                        }
                }
        }
}