ajax局部刷新及小程序 -

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ajax局部刷新及小程序

博客分类：

ajax

XMLHttpRequest为运行于浏览器中的javascript脚本提供了一种在页面内与服务器通信

的手段，这样就使得页面内的javascript可以在不刷新页面的前提下，向服务器提交数据，

及从服务器获取数据

实现功能：当输入学号后，自动补充姓名和性别

程序代码如下：
User代码如下：

package com.bean;

public class User {
	
	private String no;
	
	private String username;
	
	private String sex;

	public String getNo() {
		return no;
	}

	public void setNo(String no) {
		this.no = no;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

}

GetServlet代码如下：

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.bean.User;


public class GetUser extends  HttpServlet{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String no = request.getParameter("no");
		List<User> list = new ArrayList<User>();
		
		User user1 = new User();
		User user2 = new User();
		User user3 = new User();
		user1.setNo("101");
		user1.setUsername("liyi");
		user1.setSex("male");
		
		user2.setNo("102");
		user2.setUsername("zhangsan");
		user2.setSex("male");
		
		user3.setNo("103");
		user3.setUsername("lisi");
		user3.setSex("female");
		
		list.add(user1);
		list.add(user2);
		list.add(user3);
		System.out.println("success invoke service!");
		
		PrintWriter out = response.getWriter();
		response.setContentType("text/xml");
		response.setCharacterEncoding("utf-8");
		response.setHeader("Cache-Control", "no-cache");
		out.println("<?xml version='1.0' encoding='utf-8'?>");
		out.println("<response>");       
		for(int i=0;i<list.size();i++){ 
			if(list.get(i).getNo().equalsIgnoreCase(no)){  
				out.print("<username>"+list.get(i).getUsername()+"</username>");    
				out.print("<sex>"+list.get(i).getSex()+"</sex>");    
				}   
			}    
		out.println("</response>");   
		out.flush();
		out.close();  
	}
	
}

web.xml代码：

<?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">
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>

	<servlet>
		<servlet-name>GetUser</servlet-name>
		<servlet-class>com.servlet.GetUser</servlet-class>
	</servlet>
	
	<servlet-mapping>
	  <servlet-name>GetUser</servlet-name>
	  <url-pattern>/GetUser</url-pattern>
	</servlet-mapping>
</web-app>

index.jsp代码：

<%@ 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 HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>ajax</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<script type="text/javascript">
	 var xmlHttp;
	 
	 function makeRequest(){
		 if(window.XMLHttpRequest){
			 xmlHttp = new XMLHttpRequest();
		 }else if(window.ActiveXObject){
			 xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		 }
	 }
	 function createAjax(no){
		 makeRequest();
		 var url = "GetUser?no="+no;
		 xmlHttp.open('GET',url,true);
		 xmlHttp.onreadystatechange=callback;
		 xmlHttp.setRequestHeader("Content-Type","text/html;charset=utf-8");
		 xmlHttp.send(null);
	 }
	 function callback(){
		 window.alert(document.getElementById('no').value);
		 if(xmlHttp.readyState==4){
			 if(xmlHttp.status==200){
				 xmlDom = xmlHttp.responseXML;
				 document.getElementById('username').value=xmlDom.getElementsByTagName("username")[0].firstChild.data;
				 document.getElementById('sex').value=xmlDom.getElementsByTagName("sex")[0].firstChild.data;
			 }else{
				 window.alert("xmlHttp status :"+xmlHttp.status);
			 }
		 }else{
			 window.alert(xmlHttp.readyState);
		 }
	 }
	</script>
  </head>
  
  <body>
  <div style="margin-top: 50px;"></div>
    <table cellpadding="0" cellspacing="0" bgcolor="#33CCFF" border="0" align="center">
     <tr>
      <td>学号：</td>
      <td>
        <input id="no" name="no" onblur="createAjax(this.value);">
      </td>
     </tr>
     <tr>
      <td>姓名：</td>
      <td>
       <input id="username" name="username">
      </td>
     </tr>
     <tr>
      <td>性别：</td>
      <td>
       <input id="sex" name="sex">
      </td>
     </tr>
    </table>
  </body>
</html>

运行结果：