今天就跟大家聊聊有关怎么在AJAX中利用Servlet处理数据并显示，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
一、写前台jsp页面index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'index.jsp' starting page</title> <script type="text/javascript"> /* ajax 的几个步骤： 1、建立XmlHttpRequest对象 2、设置回调函数 3、使用Open方法建立与服务器的连接 4、向服务器发送数据 5、在回调函数中针对不同响应状态进行处理 */ var xmlHttp; function createXMLHttpRequest(){ //1建立XmlHttpRequest对象 if(window.ActiveXObject){ try{ xmlHttp = new ActiveXObject("Microsoft.XMLHttp"); }catch(e){ alert("Error!!!"); } }else{ xmlHttp = new XMLHttpRequest(); } } function showMes(){ //2设置回调函数 if(xmlHttp.readyState==4){ //数据接收完成并可以使用 if(xmlHttp.status==200){ //http状态OK //5、在回调函数中针对不同响应状态进行处理 document.getElementById("sp").innerHTML = xmlHttp.responseText; //服务器的响应内容 }else{ alert("出错："+xmlHttp.statusText); //HTTP状态码对应的文本 } } } /** //这是GET方法传送 function getMes(){ createXMLHttpRequest(); var txt = document.getElementById("txt").value; var url="servlet/AjaxServlet?txt="+txt; url = encodeURI(url); //转换码后再传输 xmlHttp.open("GET",url,true); //3使用Open方法建立与服务器的连接 xmlHttp.onreadystatechange=showMes; xmlHttp.send(null); //4向服务器发送数据 } */ /** *这是post方法 */ function postMes(){ createXMLHttpRequest(); var txt = document.getElementById("txt").value; var url = "servlet/AjaxServlet"; var params = "username="+txt; // alert(params); xmlHttp.open("POST",url,true); xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8"); xmlHttp.send(params); xmlHttp.onreadystatechange = showMes; } </script> </head> <body> <input type="text" id="txt"/> <input type="button" value="query" onclick="postMes()" /> <span id="sp"></span> </body> </html>
二、写后台Servlet加random随机数，关键代码如下：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8"); //用utf-8转换获得传输过来的码
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String txt = request.getParameter("txt");
// String tx = new String(txt.getBytes("iso-8859"),"utf-8");
out.print("txt="+txt+Math.random());
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
// String txt = new String(username.getBytes("ISO-8859-1"),"UTF-8");
String txt = new String(username);
out.print("txt="+txt+":"+Math.random());
out.flush();
out.close();
}看完上述内容，你们对怎么在AJAX中利用Servlet处理数据并显示有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注亿速云行业资讯频道，感谢大家的支持。
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