需要实现这样的一个功能,有一个HTML文件,假设为demo.html . 当页面加载时候用AJAX发送请求到数据库然后通过ID查询到一个值, 输出在这个html文件上(注 ID 为HTML文件里固定的值带着传递,数据库里对应的 ID 是唯一的,如通过ID查询NUM<int型>) 使用语言为java 别给我发asp,或php的 我看不懂, ajax发送请求到一个action中即可, 不要贴网页,把代码贴上就好,只要我看懂并实现马上给分.我对AJAX和JS理解比较差,不要口水我了,请大家帮忙!
答案：简单例子，Action自己改动HTML：
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" language="javaScript" charset="utf-8">
var xmlRequest = false;
function getXmlRequest(){
try{
xmlRequest = new XMLHttpRequest();
}catch(e){
xmlRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
}
function loading(){
getXmlRequest();
if(!xmlRequest){
return ;
}
var url = "test.do";
xmlRequest.onreadystatechange = getResult;
xmlRequest.open("GET", url, true);
xmlRequest.send(null);
}
function getResult(){
if(xmlRequest.readyState == 4){
if(xmlRequest.status == 200){
var result = document.getElementById("result");
var response = xmlRequest.responseText;
result.innerHTML = response;
}
}
}
</script>
</head>
<body onload="loading()">
TODO write content
<div id="result">
</div>
</body>
</html> Struts Action: package com.myapp.struts;import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForward;
public class TestAction extends org.apache.struts.action.Action {
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
//Action 自己改动
response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter();
try {
//
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet NewServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Struts at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
} return null;
}
}//这是我写的一个简单的发送AJAX请求的函数
//首先要添加对通用开源AJAX类zxml.js的引用
<script type="text/javascript" src="js/zxml.js"></script>
<script type="text/javascript">
function requestIndexList(t,movnum,cid,gid,mid,sid) { //v1.1
var myGlobalHandlers = {
onCreate: function(){
Element.show('flasher');
},
onComplete: function() {
if(Ajax.activeRequestCount == 0){
Element.hide('flasher');
}
}
};var oXmlHttp = zXmlHttp.createRequest();
// 根据传入参数构建调用后台程序的action,并发送AJAX请求
oXmlHttp.open("get", "action/GetIndexList.php?t="+t+"&movnum="+movnum+"&cid="+cid+"&gid="+gid+"&mid="+mid+"&sid="+sid, true);
oXmlHttp.onreadystatechange = function () {
if (oXmlHttp.readyState == 4) {
if (oXmlHttp.status == 200) {
displayIndexList(t,oXmlHttp.responseText);
} else {
displayIndexList(t,"发生错误: " + oXmlHttp.statusText);
}
} else {
Ajax.Responders.register(myGlobalHandlers);
}
};
oXmlHttp.send(null);
}</script>
用java？？都后台了，还怎么aja
