AJAX+JSP實(shí)現(xiàn)讀取XML內(nèi)容并按排列顯示輸出的方法示例

%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
%
  response.setContentType("text/xml");
  String txt = request.getParameter("username");
  out.println("student>name>張三/name>age>21/age>sex>男/sex>/student>");
 %>

%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
html>
 head>
  title>ajax02/title>
  script type="text/javascript">
  /*
    ajax 的幾個(gè)步驟：
    1、建立XmlHttpRequest對(duì)象
    2、設(shè)置回調(diào)函數(shù)
    3、使用Open方法建立與服務(wù)器的連接
    4、向服務(wù)器發(fā)送數(shù)據(jù)
    5、在回調(diào)函數(shù)中針對(duì)不同響應(yīng)狀態(tài)進(jìn)行處理
  */
    var xmlHttp;
    function createXMLHttpRequest(){  //1建立XmlHttpRequest對(duì)象
      if(window.ActiveXObject){
        try{
          alert("Msxml2.XmlHttp.5.0");
            xmlHttp = new ActiveXObject("Msxml2.XmlHttp.5.0");
        }catch(e){
          try{
            xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
          }catch(e){
            alert("Microsoft.XMLHttp");
          }
        }
      }else{
        xmlHttp = new XMLHttpRequest();
      }
    }
    function showMes(){   //2設(shè)置回調(diào)函數(shù)
      if(xmlHttp.readyState==4){ //數(shù)據(jù)接收完成并可以使用
        if(xmlHttp.status==200){ //http狀態(tài)OK
        //5、在回調(diào)函數(shù)中針對(duì)不同響應(yīng)狀態(tài)進(jìn)行處理
        // document.getElementById("sp").innerHTML = xmlHttp.responseText; //服務(wù)器的響應(yīng)內(nèi)容
          var name = xmlHttp.responseXML.getElementsByTagName("name")[0].firstChild.nodeValue;
          var age = xmlHttp.responseXML.getElementsByTagName("age")[0].firstChild.nodeValue;
          var sex = xmlHttp.responseXML.getElementsByTagName("sex")[0].firstChild.nodeValue;
          document.getElementById("spanname").innerHTML = name;
          document.getElementById("spanage").innerHTML = age;
          document.getElementById("spansex").innerHTML = sex;
        }else{
          alert("出錯(cuò)："+xmlHttp.statusText); //HTTP狀態(tài)碼對(duì)應(yīng)的文本
        }
      }
    }
    /**
    //這是GET方法傳送
    function getMes(){
      createXMLHttpRequest();
      var txt = document.getElementById("txt").value;
      var url="servlet/AjaxServlet?txt="+txt;
      url = encodeURI(url); //轉(zhuǎn)換碼后再傳輸
      xmlHttp.open("GET",url,true); //3使用Open方法建立與服務(wù)器的連接
      xmlHttp.onreadystatechange=showMes;
      xmlHttp.send(null); //4向服務(wù)器發(fā)送數(shù)據(jù)
    }
    */
    /**
    *這是post方法
    */
    function postMes(){
      createXMLHttpRequest();
      var txt = document.getElementById("txt").value;
    // var url = "servlet/AjaxServlet";
      var url = "work02forxml-2.jsp"
      var params = "username="+txt;
      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()" />br>
  span id="sp">/span>
  姓名：span id="spanname">/span>br>
  年齡：span id="spanage">/span>br>
  性別：span id="spansex">/span>
 /body>
/html>