AJAX与servlet的信息交互 

 1 <%@ page language="java" import="java.util.*" pageEncoding="gb2312" %>  
 2 <%@ page import=" java.net.*" %>
 3 
 4 
 5 <html>  
 6   <head>  
 7   <script type="text/javascript">
 8  function showHint(str)
 9 {
10 var xmlhttp;
11 if (str.length==0)
12   {
13   document.getElementById("txtHint").innerHTML="";
14   return;
15   }
16 if (window.XMLHttpRequest)
17   {// code for IE7+, Firefox, Chrome, Opera, Safari
18   xmlhttp=new XMLHttpRequest();
19   }
20 else
21   {// code for IE6, IE5
22   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
23   }
24 xmlhttp.onreadystatechange=function()
25   {
26   if (xmlhttp.readyState==4 && xmlhttp.status==200)
27     {
28     document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
29     }
30   }
31 
32 xmlhttp.open("GET","servlet/gethint?q="+str,true);
33 xmlhttp.send();
34 }
35   </script>
36     <title>验证码测试</title>  
37   </head>      
38   <body>  
39     <h3>请输入字母（a-z）</h3>
40     <form action="">
41     姓名：<input type="text" id="text1" onkeyup="showHint(this.value)"/>
42      <p>建议：<span id="txtHint"></span></p>
43     </form>
44 </body>
45 </html>
 1 package demoservlet;
 2 
 3 import java.io.IOException;
 4 import java.io.PrintWriter;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 
11 public class gethint extends HttpServlet {
12 
13     /**
14      * Constructor of the object.
15      */
16     public gethint() {
17         super();
18     }
19 
20     /**
21      * Destruction of the servlet. <br>
22      */
23     public void destroy() {
24         super.destroy(); // Just puts "destroy" string in log
25         // Put your code here
26     }
27 
28     /**
29      * The doGet method of the servlet. <br>
30      *
31      * This method is called when a form has its tag value method equals to get.
32      * 
33      * @param request the request send by the client to the server
34      * @param response the response send by the server to the client
35      * @throws ServletException if an error occurred
36      * @throws IOException if an error occurred
37      */
38     public void doGet(HttpServletRequest request, HttpServletResponse response)
39             throws ServletException, IOException {
40         request.setCharacterEncoding("gb2312");
41         response.setCharacterEncoding("gb2312");
42         String str=request.getParameter("q");
43         
44         response.setContentType("text/html");
45         PrintWriter out = response.getWriter();
46         out.write("ada");
47         out.flush();
48         out.close();
49     }
50 
51     /**
52      * The doPost method of the servlet. <br>
53      *
54      * This method is called when a form has its tag value method equals to post.
55      * 
56      * @param request the request send by the client to the server
57      * @param response the response send by the server to the client
58      * @throws ServletException if an error occurred
59      * @throws IOException if an error occurred
60      */
61     public void doPost(HttpServletRequest request, HttpServletResponse response)
62             throws ServletException, IOException {
63 
64         response.setContentType("text/html");
65         PrintWriter out = response.getWriter();
66         out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
67         out.println("<HTML>");
68         out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
69         out.println("  <BODY>");
70         out.print("    This is ");
71         out.print(this.getClass());
72         out.println(", using the POST method");
73         out.println("  </BODY>");
74         out.println("</HTML>");
75         out.flush();
76         out.close();
77     }
78 
79     /**
80      * Initialization of the servlet. <br>
81      *
82      * @throws ServletException if an error occurs
83      */
84     public void init() throws ServletException {
85         // Put your code here
86     }
87 
88 }

 

posted @ 2015-10-06 20:46  丶下雨了  阅读(244)  评论(0)    收藏  举报