Ajax如何读取数据流中的xml文件？
<P>这是我的源代码，请大家帮忙看看，我读到的怎么都是空值。是不是方法错了？<BR><script type="text/javascript"> <BR> var xmlHttp;<BR> <BR> function createXMLHttpRequest(){<BR> if(window.ActiveXObject){<BR> xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");<BR> }<BR> else if(window.XMLHttpRequest){<BR> xmlHttp=new XMLHttpRequest();<BR> }<BR> }<BR> <BR> function createXML(){<BR> var xml="<pets>";<BR> var options=document.getElementById("petTypes").childNodes;<BR> var option=null;<BR> for(var i=0;i<options.length;i++){<BR> option=options[i];<BR> if(option.selected){<BR> xml=xml+"<type>"+option.value+"<\/type>";<BR> }<BR> }<BR> xml=xml+"<\/pets>"+"\n";<BR> alert(xml);<BR> return xml;<BR> }<BR> <BR> function sendPetTypes(){<BR> createXMLHttpRequest();<BR> var xml=createXML();<BR> var url="/wms/wmtsppdmul.html?method=ajax&timeStamp="+new Date().getTime();<BR> xmlHttp.open("POST",url,true);<BR> xmlHttp.onreadystatechange=handleStateChange;<BR> xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");<BR> xmlHttp.send(xml); <BR> }<BR> <BR> function handleStateChange(){ <BR> alert(xmlHttp.readyState) ;<BR> if(xmlHttp.readyState==4){ <BR> alert(xmlHttp.status) ; <BR> if(xmlHttp.status==200){<BR> alert(""); <BR> parseResults();<BR> }<BR> }<BR> } <BR> <BR> function parseResults(){alert(xmlHttp.responseText);<BR> var responseDiv=document.getElementById("serverResponse");<BR> if(responseDiv.hasChildNodes()){<BR> responseDiv.removeChild(responseDiv.childNodes[0]); <BR> } <BR> var responseText=document.createTextNode(xmlHttp.responseText);<BR> responseDiv.appendChild(responseText); <BR> }<BR> <BR></script></P><P>public void ajax(HttpServletRequest request,HttpServletResponse response) throws Exception { <BR>// request.setCharacterEncoding("GB2312");<BR>// response.setContentType("text/html;charset=GB2312");<BR> String x=request.getParameter("");<BR> String xml=readXMLFromRequestBody(request);<BR> Document xmlDoc=null;<BR> try{System.out.println("=============");<BR> xmlDoc=DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new ByteArrayInputStream(xml.getBytes()));<BR> }catch(ParserConfigurationException e){<BR> System.out.println("ParserConfigurationException:"+e);<BR> }catch(SAXException e){<BR> System.out.println("SAXException:"+e);<BR> }System.out.println("=====111111========");<BR> NodeList selectedPetTypes=xmlDoc.getElementsByTagName("type");<BR> System.out.println("=============");<BR> String type=null;<BR> String responseText="Selected Pets:";<BR> System.out.println("=============");<BR> for(int i=0;i<selectedPetTypes.getLength();i++){<BR> type=selectedPetTypes.item(i).getFirstChild().getNodeValue();<BR> responseText=responseText+""+type;<BR> }<BR> System.out.println("=====333333333========");<BR> response.setContentType("text/xml");<BR> response.getWriter().print(responseText);<BR> <BR> }<BR> <BR> private String readXMLFromRequestBody(HttpServletRequest request){<BR> System.out.println("====2222222=========");<BR> StringBuffer xml=new StringBuffer();<BR> String line=null;<BR> try{<BR> BufferedReader reader=request.getReader();<BR> System.out.println("wwwwwww======"+reader.readLine());<BR> while((line=reader.readLine())!=null){ <BR> xml.append(line);<BR> }<BR> }catch(Exception e){<BR> System.out.println("Error reading XML:"+e.toString()); <BR> }<BR> System.out.println("efadsfdafd============="+xml.toString());<BR> return xml.toString();<BR> }</P>
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