下面的例子将为您演示当用户在输入框中键入字符时，网页如何与 web 服务器进行通信。
本示例包括2个文件。分别为showhint.html和ShowHintServlet。
以下是详细代码：
showhint.html
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>showhint.html</title>
-
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="this is my page">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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-
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<script language="javascript" type="text/javascript">
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var xmlHttp;
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function createXMLHttpRequest(){
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if(window.ActiveXObject){
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xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
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}else if(window.XMLHttpRequest){
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xmlHttp = new XMLHttpRequest();
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}
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}
-
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function doRequest(){
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createXMLHttpRequest();
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var url = "servlet/ShowHintServlet?q=" + document.getElementById("email").value + "&timeStamp=" + new Date().getTime();
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xmlHttp.onreadystatechange = handleStateChange;
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xmlHttp.open("GET",url,true);
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xmlHttp.send(null);
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}
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function handleStateChange(){
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if(xmlHttp.readyState == 4){
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if(xmlHttp.status == 200){
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document.getElementById("hintbox").innerHTML = xmlHttp.responseText;
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}
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}
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}
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</script>
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</head>
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<body>
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请输入你的手机号码:
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<input type="text" name="email" id="email" onkeyup="doRequest()" />
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<div id="hintbox"></div>
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</body>
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</html>
ShowHintServlet代码
- package ajax.study;
-
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import java.io.IOException;
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import java.io.PrintWriter;
-
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
-
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public class ShowHintServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html");
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String[] emails = {
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"18789245070",
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"13647579626",
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"13648649621",
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"18789273423",
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"13876221345",
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"13697542356",
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"15248939447"
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};
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PrintWriter out = response.getWriter();
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String q = request.getParameter("q");
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String hint = "";
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if(q.length()>0){
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for(int i=0; i<emails.length; i++){
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if(q.equalsIgnoreCase(emails[i].substring(0, q.length()))){
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if(hint==""){
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hint = emails[i];
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}else{
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hint = hint + " " + emails[i];
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}
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}
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}
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}
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if(hint==""){
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hint = "no suggestion";
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}
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out.println(hint);
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out.flush();
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out.close();
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}
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-
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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doGet(request,response);
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}
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}
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