日期:2014-05-16 浏览次数:20754 次
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>输入提示示范</title> <meta name="author" content="Yeeku.H.Lee" /> <meta name="website" content="http://www.crazyit.org" /> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body> <h3> 请输入您喜欢的水果 </h3> <div style="width: 280px; font-size: 9pt"> 输入apple、banana、peach可看到明显效果: </div> <br /> <input id="favorite" name="favorite" type="text" onblur="$('tips').hide()" /> <img id="Loadingimg" src="img/indicator.gif" style="display: none" /> <div id="tips" style="width: 160px; border: 1px solid menu; background-color: #ffffcc; display: none"></div> <script src="js/prototype-1.6.0.3.js" type="text/javascript"></script> <script type="text/javascript"><!-- //监控目标文本框输入文字发生改变的函数 function searchFruit() { //请求的地址 var url = 'TipServlet'; //将favorite表单域的值转换为请求参数 var params = Form.Element.serialize('favorite'); //创建Ajax.Request对象,对应于发送请求 var myAjax = new Ajax.Request(url, { //请求方式:POST method : 'post', //请求参数 parameters : params, //指定回调函数 onComplete : showResponse, //是否异步发送请求 asynchronous : true }); } //定义回调函数 function showResponse(request) { //在提示tip元素中输出服务器的响应 $('tips').innerHTML = request.responseText; //显示提示tip对象 $('tips').show(); } //为favorite表单域绑定事件处理函数 new Form.Element.Observer("favorite", 0.5, searchFruit); //定义Ajax的全局事件处理器 var myGlobalHandlers = { //刚刚开始Ajax交互时触发该属性指定的函数。 onCreate : function() { $('Loadingimg').show(); }, //交互失败时触发该属性指定的函数。 onFailure : function() { alert('对不起!\n页面加载出错!'); }, //交互成功时触发该属性指定的函数。 onComplete : function() { //如果正在进行Ajax交互的XMLHttpRequest对象数目为0 if (Ajax.activeRequestCount == 0) { $('Loadingimg').hide(); } } }; //为Ajax事件绑定全局的事件处理器 Ajax.Responders.register(myGlobalHandlers); </script> </body> </html>?Servlet代码:
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 TipServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); //获取请求参数favorite String hdchar = request.getParameter("favorite"); System.out.println(hdchar); PrintWriter out = response.getWriter(); //如果请求参数是apple的前几个字符,则输出apple if ("apple".startsWith(hdchar)) { out.println("apple"); } //如果请求参数是banana的前几个字符,则输出banana else if("banana".startsWith(hdchar)) { out.println("banana"); } //如果请求参数是peach的前几个字符,则输出peach else if("peach".startsWith(hdchar)) { out.println("peach"); } //否则将输出other fruit els