Ajax返回XML数据

* XMLHttpRequest对象的responseXML属性：XML格式
* 服务器端：
* 设置响应首部信息，"Content-Type"为"text/xml"
* 手工构建一个xml格式的数据内容
* 如何将javabean、List、Array和Map集合转换成xml数据格式？
* 第三方工具：xStream
* 核心包：xstream-1.4.4.jar
* 必要依赖包：xpp3_min-1.1.4c.jar
* 客户端：XMLHttpRequest对象的responseXML属性

XmlFileServlet.java

public class XmlFileServlet extends HttpServlet {

	public void doGet(HttpServletRequest request,HttpServletResponse response)
			throws ServletException,IOException {

		//如果服务器端向客户端响应xml格式的数据，需要设置响应首部信息："Content-Type"为"text/xml"
		response.setContentType("text/xml;charset=utf-8");
		PrintWriter out = response.getWriter();
		
		//查询数据库，结果集都封装在javabean、List、Array和Map集合中
		
		//如何将javabean、List、Array和Map集合转换成xml数据格式？
		
		//手工构建一个xml格式的数据内容
		out.println("<china>");
		out.println("<province name='吉林省'>");
		out.println("<city>长春</city>");
		out.println("<city>吉林市</city>");
		out.println("<city>四平</city>");
		out.println("<city>松原</city>");
		out.println("<city>通化</city>");
		out.println("</province>");
		
		out.println("<province name='辽宁省'>");
		out.println("<city>沈阳</city>");
		out.println("<city>大连</city>");
		out.println("<city>鞍山</city>");
		out.println("<city>抚顺</city>");
		out.println("<city>铁岭</city>");
		out.println("</province>");
		
		out.println("<province name='山东省'>");
		out.println("<city>济南</city>");
		out.println("<city>青岛</city>");
		out.println("<city>威海</city>");
		out.println("<city>烟台</city>");
		out.println("<city>潍坊</city>");
		out.println("</province>");
		out.println("</china>");
	}

}

<%@ page language="java"  pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<title>级联菜单</title>
		<script type="text/javascript" src="./xmFile.js"> </script>
	</head>
	<body>
     <select id="province" name="province">
       <option value="">请选择....</option>
     </select>
	 <select id="city" name="city">
	 	<option value="">请选择.....</option>
	 </select>
  </body>
</html>

window.onload = function(){
	var xhr = ajaxFunction();
	
	xhr.onreadystatechange = function(){
		if(xhr.readyState==4){
			if(xhr.status==200){
				var docXml = xhr.responseXML;
				
				var provinceXmlElements = docXml.getElementsByTagName("province");
				
				for(var i=0;i<provinceXmlElements.length;i++){
					var provinceXmlElement = provinceXmlElements[i];
					
					var provinceXmlValue = provinceXmlElement.getAttribute("name");
					
					var option = document.createElement("option");
					option.setAttribute("value",provinceXmlValue);
					var text = document.createTextNode(provinceXmlValue);
					option.appendChild(text);
					
					var provinceElement = document.getElementById("province");
					
					provinceElement.appendChild(option);
					
				}
				
				document.getElementById("province").onchange = function(){
					var cityElement = document.getElementById("city");
					var options = cityElement.getElementsByTagName("option");
					for(var z=1;z<options.length;z++){
						cityElement.removeChild(options[1]);
						z--;
					}
					
					var provinceValue = this.value;
					
					for(var i=0;i<provinceXmlElements.length;i++){
						var provinceXmlElement = provinceXmlElements[i];
					
						var provinceXmlValue = provinceXmlElement.getAttribute("name");
						
						if(provinceValue==provinceXmlValue){
							var cityXmlElements = provinceXmlElement.getElementsByTagName("city");
							
							for(var j=0;j<cityXmlElements.length;j++){
								var cityXmlElement = cityXmlElements[j];
								
								var cityXmlValue = cityXmlElement.firstChild.nodeValue;
								
								var option = document.createElement("option");
								option.setAttribute("value",cityXmlValue);
								var text = document.createTextNode(cityXmlValue);
								option.appendChild(text);
								
								cityElement.appendChild(option);
								
							}
							
						}
					}
					
				}
			}
		}
	}
	
	xhr.open("get","../xmlFileServlet?timeStamp="+new Date().getTime(),true);
	
	xhr.send(null);
	
	function ajaxFunction(){
	   var xmlHttp;
	   try{ // Firefox,Opera 8.0+,Safari
	        xmlHttp=new XMLHttpRequest();
	    }
	    catch (e){
		   try{// Internet Explorer
		         xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		      }
		    catch (e){
		      try{
		         xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		      }
		      catch (e){}
		      }
	    }
	
		return xmlHttp;
	 }
}

原文链接：https://www.f2er.com/ajax/165290.html

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