AJAX学习笔记之xml的JQ使用方法

来源：互联网发布：地板污染知乎编辑：程序博客网时间：2024/06/05 18:44

首先在src文件下写好servlet，命名为AJAXMLServe：

import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.ServletException;import java.io.IOException;import java.io.PrintWriter;import java.net.URLDecoder;public class AJAXXMLServe extends HttpServlet{protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){doGet(httpServletRequest,httpServletResponse);}protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){try{//修改,响应的content-Type必须是text/xmlhttpServletResponse.setContentType("text/xml;charset=utf-8");PrintWriter out = httpServletResponse.getWriter();String old = httpServletRequest.getParameter("name");StringBuilder builder = new StringBuilder();builder.append("<message>");if(old == null || old.length() == 0){builder.append("用户名不能为空").append("</message>");}else{String name = old;if(name.equals("123")){builder.append("用户名["+name+"]未存在").append("</message>");}else{builder.append("用户名["+name+"]未存在").append("</message>");}out.println(builder.toString());}}catch(Exception e){e.printStackTrace();}}}

设置好之后，编写web.xml文件:

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>  <welcome-file-list>    <welcome-file>ajax.html</welcome-file>  </welcome-file-list>   <p class="p1"><span class="s1">  </span><span class="s2"><</span>servlet<span class="s2">></span></p><p class="p1"><span class="s1">  <span></span></span><span class="s2"><</span>servlet-name<span class="s2">></span><span class="s1">AJAXXMLServe</span><span class="s2"></</span>servlet-name<span class="s2">></span></p><p class="p1"><span class="s1">  <span></span></span><span class="s2"><</span>servlet-class<span class="s2">></span><span class="s1">AJAXXMLServe</span><span class="s2"></</span>servlet-class<span class="s2">></span></p><p class="p1"><span class="s1">  </span><span class="s2"></</span>servlet<span class="s2">></span></p><p class="p1"><span class="s1">  </span><span class="s2"><</span>servlet-mapping<span class="s2">></span></p><p class="p1"><span class="s1">  <span></span></span><span class="s2"><</span>servlet-name<span class="s2">></span><span class="s1">AJAXXMLServe</span><span class="s2"></</span>servlet-name<span class="s2">></span></p><p class="p1"><span class="s1">  <span></span></span><span class="s2"><</span>url-pattern<span class="s2">></span><span class="s1">/AJAXXMLServe</span><span class="s2"></</span>url-pattern<span class="s2">></span></p><p class="p1"><span class="s1">  </span><span class="s2"></</span>servlet-mapping<span class="s2">></span></p> </web-app>

编写html文件：

<!DOCTYPE html><html>  <head>    <title>ajax.html</title><script type="text/javascript" src="js/jquery-1.11.2.min.js"></script><script type="text/javascript" src="js/ajax.js"></script>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=GB18030">        <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->  </head>    <body>    This is a ajax's test <br>    <input type="text" id="user_Name" />    <input type="button" id="button" value="校验"  />    <div id="result"></div>  </body></html>

编写jq文件：

<p class="p1"><span class="s1">function</span> verify(){</p><p class="p1"><span></span><span class="s1">var</span> user_Name = $(<span class="s2">"#user_Name"</span>).val();</p><p class="p1"><span></span>$.ajax({</p><p class="p1"><span></span><span></span>type : <span class="s2">"GET"</span>,</p><p class="p2"><span class="s3"><span></span><span></span>url : </span>"AJAXXMLServe"<span class="s3">,</span></p><p class="p1"><span></span><span></span>data : <span class="s2">"name="</span>+user_Name,</p><p class="p3"><span class="s3"><span></span><span></span>dataType : </span><span class="s2">"xml"</span><span class="s3">,</span>//告诉<span class="s4">jquery</span>返回的数据格式</p><p class="p3"><span class="s3"><span></span><span></span>success : callback</span>//定义交互完成，并且服务器正确返回数据时调用的回调函数</p><p class="p1"><span></span>});</p><p class="p1">}</p><p class="p4"></p><p class="p1"><span class="s1">function</span> callback(data){</p><p class="p4"><span></span></p><p class="p3"><span class="s3"></span>//解析data这个<span class="s4">dom</span>对象中的数据</p><p class="p3"><span class="s3"></span>//首先需要将<span class="s4">dom</span>转换成<span class="s4">jquery</span>对象</p><p class="p1"><span></span><span class="s1">var</span> jqueryObj = $(data);</p><p class="p3"><span class="s3"></span>//获取文本数据</p><p class="p1"><span></span><span class="s1">var</span> text = jqueryObj.children().text();</p><p class="p1"><span></span><span class="s1">var</span> resultObj = $(<span class="s2">"#result"</span>);</p><p class="p1"><span></span>resultObj.html(text);</p><p class="p1">}</p>

写完之后，就可以愉快的运行啦

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