Ajax Servlet在网络编程的应用是怎样的

这期内容当中小编将会给大家带来有关Ajax Servlet在网络编程的应用是怎样的，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

Ajax异步请求,servlet产生随机数据,Html页面无刷新显示。

运行环境：jdk1.5+tomcat 5.5

一、ajaxServlet.java

package com;  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;  import java.util.Random;  public class ajaxServlet extends HttpServlet{  private static final String CONTENT_TYPE="text/xml; charset=gb2312";  public void init() throws ServletException{}  public void doGet(HttpServletRequest request,HttpServletResponse response)  throws ServletException,IOException{   response.setContentType(CONTENT_TYPE);   response.setHeader("Cache-Control","no-cache");   response.setHeader("Pragma","no-cache");   response.setDateHeader("Expires",0);    PrintWriter out=response.getWriter();   String action=request.getParameter("action");  if(("send").equals(action)){      Random random = new Random();    String AA=Integer.toString(Math.abs(random.nextInt()));    String BB=Integer.toString(Math.abs(random.nextInt()));    String CC=Integer.toString(Math.abs(random.nextInt()));    String DD=Integer.toString(Math.abs(random.nextInt()));    StringBuffer sb=new StringBuffer();    sb.append(AA);  sb.append("@@@");    sb.append(BB);  sb.append("@@@");    sb.append(CC);  sb.append("@@@");    sb.append(DD);    out.write(sb.toString());    out.close();    } }}

二、testajax.html

﹤html﹥  ﹤head﹥  ﹤title﹥AJAX.html﹤/title﹥  ﹤/head﹥  ﹤script type="text/javascript"﹥    function getResult(){    var url = "/Tajax/AajaxServlet?action=send";    if (window.XMLHttpRequest) {       req = new XMLHttpRequest();     }else if (window.ActiveXObject){       req = new ActiveXObject("Microsoft.XMLHTTP");     }     if(req){        req.open("GET",url, true);        req.onreadystatechange = complete;        req.send(null);     }   }

/*分析返回的文本文档*/

function complete(){    if (req.readyState == 4) {       if (req.status == 200) {         // alert(req.responseText);         var strResult = unescape(req.responseText);        var arrResult = strResult.split("@@@");        RemoveRow();  //删除以前的数据.        num1 = arrResult[0]; //字段num1的值        num2 = arrResult[1]; //字段num2的值        num3 = arrResult[2];        num4 = arrResult[3];        row1= tb.insertRow();        cell1 = row1.insertCell();        cell1.innerText = num1;        cell2 = row1.insertCell();        cell2.innerText = num2;        row2= tb.insertRow();        cell3 = row2.insertCell();        cell3.innerText = num3;        cell4 = row2.insertCell();        cell4.innerText = num4;      } else {         alert('There was a problem with the request.');       }     }   }    function RemoveRow(){//保留***行表头,其余数据均删除.      var iRows = tb.rows.length;      for(var i=0;i﹤ iRows-1;i++){         tb.deleteRow(1);      }   }   function MyShow(){//2秒自动刷新一次,2秒取得一次数据.    timer = window.setInterval("getResult()",2000);    }    ﹤/script﹥    ﹤body onload=MyShow()"﹥  ﹤table width="47%" height="23" border="0" cellpadding="1" cellspacing="0" id="tb"﹥  ﹤tr﹥﹤td﹥代码﹤/td﹥  ﹤td﹥价格﹤/td﹥  ﹤/tr﹥  ﹤/table﹥   ﹤form﹥  ﹤p﹥输入股票代码:  ﹤input type="text" size="14" name="phone" id="phone"/﹥  ﹤/p﹥  ﹤p﹥你交易的数量:﹤/p﹥  ﹤p﹥﹤textarea name="order" rows="6" cols="50" id="order"﹥﹤/textarea﹥﹤/p﹥  ﹤p﹥﹤input type="submit" value="提交" id="submit" /﹥﹤/p﹥  ﹤/form﹥   ﹤/body﹥

三、web.xml

﹤?xml version="1.0" encoding="ISO-8859-1"?﹥   ﹤web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"﹥   ﹤display-name﹥Welcome to Tomcat﹤/display-name﹥  ﹤description﹥  Welcome to Tomcat  ﹤/description﹥  ﹤servlet﹥  ﹤servlet-name﹥AajaxServlet﹤/servlet-name﹥  ﹤servlet-class﹥com.ajaxServlet﹤/servlet-class﹥  ﹤/servlet﹥  ﹤servlet-mapping﹥  ﹤servlet-name﹥AajaxServlet﹤/servlet-name﹥  ﹤url-pattern﹥/AajaxServlet﹤/url-pattern﹥  ﹤/servlet-mapping﹥  ﹤/web-app﹥

运行图：

Ajax Servlet实例在网络编程的应用就介绍到这里，是不是有点意思呢？Ajax Servlet实例在网络编程的应用是很广泛的，要在实际中积累和多应用。

上述就是小编为大家分享的Ajax Servlet在网络编程的应用是怎样的了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注行业资讯频道。