如何用servlet取代javascript获取某个给定url的feed的xml内容？
我现在可以在浏览器中用javascript，使用xmlhttprequest对象，根据feed的url调用get，获取这个feed的xml文档形式的内容，并把需要的items显示在网页上。
但现在要求浏览器不要直接获得feed的内容，所有内容要统一由服务器端去获得，并定时更新，然后基于浏览器的请求，把内容返回给浏览器。
服务器端是servlet，那servlet的java代码可以像javascript中 一样使用xmlhttprequest对象来获取feed的xml内容么?我怎么看到XMLHttpRequest只是专门用于javascript的阿。
那我究竟应该怎样在servlet的java代码中获取一个已知url的feed的文档内容？（有人说调用什么get？不大懂）具体请指点下，谢谢！
[解决办法]
用jdom来做需要jdom.jar
package com.king.utils;
import java.io.IOException;
import java.io.StringBufferInputStream;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.SAXException;
/**
* @author Kane.D
*
*/
public class XMLParser
{
private DocumentBuilderFactory domfac;
private Document doc;
//protected XMLField[][][] xMLFields;
public XMLParser()
{
domfac = DocumentBuilderFactory.newInstance();
}
public void parse(String xMLString)
{
try
{
DocumentBuilder dombuilder = domfac.newDocumentBuilder();
try
{
doc = dombuilder.parse(new StringBufferInputStream(xMLString));
}
catch (SAXException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
Element root = doc.getDocumentElement();
NodeList tables = root.getElementsByTagName( "table ");
int countx = tables.getLength();
//xMLFields = new XMLField[countx][][];
Element table;
for (int i = 0; i < countx; i++)
{
table = (Element) tables.item(i);
NodeList records = table.getElementsByTagName( "record ");
int county = records.getLength();
//xMLFields[i] = new XMLField[county][];
Element record;
for (int j = 0; j < county; j++)
{
record = (Element) records.item(j);
NodeList fields = record.getElementsByTagName( "field ");
int countz = fields.getLength();
//xMLFields[i][j] = new XMLField[countz];
Element field;
for (int k = 0; k < countz; k++)
{
//xMLFields[i][j][k] = new XMLField();
field = (Element) fields.item(k);
NodeList names = field.getElementsByTagName( "name ");
if (names.getLength() == 1)
{
Element name = (Element) names.item(0);
Text nametxt = (Text) name.getFirstChild();
//xMLFields[i][j][k].setName(nametxt.getNodeValue());
}
NodeList types = field.getElementsByTagName( "type ");
if (types.getLength() == 1)
{
Element type = (Element) types.item(0);
Text typetxt = (Text) type.getFirstChild();
//xMLFields[i][j][k].setType(typetxt.getNodeValue());
}
NodeList values = field.getElementsByTagName( "value ");
if (values.getLength() == 1)
{
Element value = (Element) values.item(0);
Text valuetxt = (Text) value.getFirstChild();
//System.out.println(new String(valuetxt.getNodeValue().getBytes( "ISO-8859-1 "), "GB2312 "));
System.out.println(valuetxt.getNodeValue());
// xMLFields[i][j][k]
// .setValue(new String(valuetxt.getNodeValue().getBytes( "utf-8 "), "gb2312 "));
//xMLFields[i][j][k].setValue(valuetxt.getNodeValue()
// .toString());
}
}
}
}
}
catch (ParserConfigurationException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (DOMException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// public XMLField[][][] getXMLFields()
// {
// return xMLFields;
// }
//
// public void setXMLFields(XMLField[][][] fields)
// {
// xMLFields = fields;
// }
public static void main(String[] args)
{
XMLParser sdd = new XMLParser();
String s = " <?xml version=\ "1.0\ " encoding=\ "UTF-8\ "?> <rss version=\ "2.0\ "> <channel> <table> "
+ " <record> <field> <name> resultcaption </name> <type> String </type> <value> 上海 </value> </field> "
+ " <field> <name> 中国 </name> <type> String </type> <value> 2007 </value> </field> </record> "
+ " <record> <field> <name> resultyear </name> <type> String </type> <value> 2007 </value> </field> "
+ " <field> <name> resultfulFillRate </name> <type> float </type> <value> 0.5 </value> </field> "
+ " </record> </table> <table> <record> <field> <name> resultcaption </name> <type> String </type> "
+ " <value> 沈阳 </value> </field> </record> </table> </channel> </rss> ";
sdd.parse(s);
// XMLField[][][] xds = sdd.getXMLFields();
//
// for (int i = 0; i < xds.length; i++)
// {
// for (int j = 0; j < xds[i].length; j++)
// {
// for (int k = 0; k < xds[i][j].length; k++)
// {
// System.out.println(xds[i][j][k].getName());
// System.out.println(xds[i][j][k].getType());
// System.out.println(xds[i][j][k].getValue());
// }
// }
// }
}
}
