---------------------------------AJAX.html-------------------------------------------
<html>
?<head>
??<title>AJAX.html</title>
?</head>
?<script type="text/javascript">
?/*通過異步傳輸XMLHTTP發送參數到ajaxServlet，返回符合條件的XML文檔*/
?function getResult(){
??var url = "ajaxServlet?action=send";
??if (window.XMLHttpRequest){
???req = new XMLHttpRequest();
??}else if (window.ActiveXObject)
??{
???req = new ActiveXObject("Microsoft.XMLHTTP");
??}
??if(req)
??{
???req.open("GET",url, true);
???req.onreadystatechange = complete;
???req.send(null);
??}
?}
?/*分析返回的XML文檔*/
?function complete(){
??if (req.readyState == 4)
??{
???if (req.status == 200){
????var type = req.responseXML.getElementsByTagName("type_name");
????var str=new Array();
????for(var i=0;i<type.length;i++){
?????str[i]=type[i].firstChild.data;
?????document.all['td'].innerHTML+=str[i]+"<BR>";
????}
???}
??}
?}
</script>
?<body onLoad="getResult()">
??<table width="80%" border="0" cellspacing="0" cellpadding="0">
???<tr>
????<td id="td">
????</td>
???</tr>
??</table>
?</body>
</html>
---------------------------------ajaxServlet.java-----------------------------------------------------
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ajaxServlet extends HttpServlet{
?private static final String CONTENT_TYPE = "text/xml; charset=gb2312";
?public void init() throws ServletException{}
?public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
?{
??response.setContentType(CONTENT_TYPE);
??PrintWriter out = response.getWriter();
??String action = request.getParameter("action");
??if (("send").equals(action))
??{
???StringBuffer sb = new StringBuffer("<type>");
???sb.append("<type_name>AA</type_name>");
???sb.append("<type_name>BB</type_name>");
???sb.append("<type_name>CC</type_name>");
???sb.append("<type_name>DD</type_name>");
???sb.append("</type>");
???out.write(sb.toString());
???out.close();
??}
?}
}
--------------------------------web.xml------------------------------------------------------
<?xml version = '1.0' encoding = 'UTF-8'?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "<web-app>
?<description>Empty web.xml file for Web Application</description>
?<servlet>
??<servlet-name>ajax</servlet-name>
??<servlet-class>ajaxServlet</servlet-class>
?</servlet>
??? <servlet-mapping>
??????? <servlet-name>ajax</servlet-name>
??????? <url-pattern>/ajaxServlet</url-pattern>
??? </servlet-mapping>
</web-app>
posted on 2006-08-29 14:06
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