回复: AJAX编程实践之与服务器通信
关于这个控件有个方法可以在各broswer中通用的JS代码：
// --------------------------------------------------------------------
// Function: CreateXMLDOM
//
// Purpose: Creates a new XML DOM.
//
// Parameters: None
//
// Returns: XMLDOM object OR null
// --------------------------------------------------------------------
function CreateXmlDOM()
{
var oXML = new ActiveXObject(GetXmlParserProgID());
try
{
oXML.setProperty( " AllowXsltScript " , true );
}
catch (err) {}
oXML.async = false ;
oXML.validateOnParse = false ;
oXML.resolveExternals = false ;
oXML.setProperty( " SelectionLanguage " , " XPath " );
try {oXML.setProperty( " NewParser " , true );} catch (e) {}
return oXML;
}
// --------------------------------------------------------------------
// Function: GetXmlParserProgID
//
// Purpose:
// Gets the ProgID of the highest available version of the
// Microsoft XML parser.
//
// Parameters: None
//
// Returns: String (i.e. "Msxml2.DOMDocument.4.0")
//
// --------------------------------------------------------------------
function GetXmlParserProgID()
{
var MAX_MAJOR_PARSER_VERSION = 10 ;
var MIN_MAJOR_PARSER_VERSION = 0 ;
var MAX_MINOR_PARSER_VERSION = 9 ;
var MIN_MINOR_PARSER_VERSION = 0 ;
var sProgID = g_sXmlParserProgID;
var bFound = false ;
if ( ! sProgID)
{
// Iterate through possible versions
for ( var nMajor = MAX_MAJOR_PARSER_VERSION; nMajor >= MIN_MAJOR_PARSER_VERSION; nMajor -- )
{
for ( var nMinor = MAX_MINOR_PARSER_VERSION; nMinor >= MIN_MINOR_PARSER_VERSION; nMinor -- )
{
// Set up the classname for the version that we're trying to instantiate
sProgID = " Msxml2.DOMDocument. " + nMajor + " . " + nMinor;
try
{
if ( new ActiveXObject(sProgID))
{
bFound = true ;
break ;
}
}
catch (e)
{}
}
if (bFound)
{
// store in a global variable to speedup subsequent calls
g_sXmlParserProgID = sProgID;
break ;
}
}
}
return sProgID;
}
|
然后直接用其load方法（本地）。
var xmlDoc = new ActiveXObject( " MSXML2.DOMDocument.3.0 " );
xmlDoc.load(local_XML_FileName); |
当然也可以直接从server取来（用get方法即可），然后以responseText的方法
xmlht.Open( " GET " ,server_XML_FileName, true );
xmlht.onreadystatechange = stateChange;
xmlht.Send( null );
function handleStateChange() {
if (xmlHttp.readyState == 4 ) {
if (xmlHttp.status == 200 ) {
xmlDoc.loadXML(xmlht.responseText);
}
}
} |
实际上xmlDoc.loadXML(xmlht.responseText)所得到的就是一个于内存中的DOM了,而直接用responseXML的话就直接可以解析为一个DOM了!(注意load（FILE）与loadXML（DOM）是不同的)
此时servert process :
import java.io. * ;
import javax.servlet. * ;
import javax.servlet.http. * ;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class PostingXMLExample extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String xml = readXMLFromRequestBody(request);
Document xmlDoc = null ;
try {
xmlDoc =
DocumentBuilderFactory.newInstance().newDocumentBuilder()
.parse( new ByteArrayInputStream(xml.getBytes()));
}
catch (ParserConfigurationException e) {
System.out.println( " ParserConfigurationException: " + e);
}
catch (SAXException e) {
System.out.println( " SAXException: " + e);
}
/**/ /* Note how the Java implementation of the W3C DOM has the same methods
* as the JavaScript implementation, such as getElementsByTagName and
* getNodeValue.
*/
NodeList selectedPetTypes = xmlDoc.getElementsByTagName( " type " );
String type = null ;
String resp ;
for ( int i = 0 ; i < selectedPetTypes.getLength(); i ++ ) {
type = selectedPetTypes.item(i).getFirstChild().getNodeValue();
responseText = responseText + " " + type;
}
response.setContentType( " text/xml " );
response.getWriter().print(responseText);
}
private String readXMLFromRequestBody(HttpServletRequest request) {
StringBuffer xml = new StringBuffer();
String line = null ;
try {
BufferedReader reader = request.getReader();
while ((line = reader.readLine()) != null ) {
xml.append(line);
}
}
catch (Exception e) {
System.out.println( " Error reading XML: " + e.toString());
}
return xml.toString();
}
} |
DOM,JDOM,JAXP随便你自己选好了！
