Java EE (Java Enterprise Edition) General Discussion

Currently I'm using following:



XP Professional

J2sdk1.4.2_01

Xerces-2_5_0

Xalan-j_2_5_1

Jakarta-tomcat-4.1.27

Jdom-b9



Current Classpath setting


User variables



PATH = c:\bmrt2.5\bin; c:\j2sdk\bin;%PATH%;%JAVA_HOME%\bin;



CLASSPATH=.;c:\xerces\xmlParserAPIs.jar;c:\xerces\xercesImpl.jar;
c:\xerces\xercesSamples.jar;c:\xalan\xercesImpl.jar;c:\xalan\xmlapis.jar;c:\xalan\xalan.jar;c:\tomcat\lib\webserver.jar;c:\tomcat\lib\jasper.jar;c:\tomcat\lib\xml.jar;c:\tomcat\common\lib\serlet.jar;c:\tomcat\lib\tools.jar; c:\tomcat\lib\tools.jar;c:\jdom\build\jdom.jar;

CATALINA_HOME= c:\tomcat
JAVA_HOME= c:\j2sdk

System variables
PATH=%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;
c:\j2sdk\bin;%Path%;%JAVA_HOME%\bin;

CLASSPATH=.;c:\xerces\xmlParserAPIs.jar;c:\xerces\xercesImpl.jar;
c:\xerces\xercesSamples.jar;c:\xalan\xercesImpl.jar;c:\xalan\xmlapis.jar;c:\xalan\xalan.jar;c:\tomcat\lib\webserver.jar;c:\tomcat\lib\jasper.jar;c:\tomcat\lib\xml.jar;c:\tomcat\common\lib\serlet.jar;c:\tomcat\lib\tools.jar; c:\tomcat\lib\tools.jar;

CATALINA_HOME= c:\tomcat
JAVA_HOME= c:\j2sdk


Program

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.jdom.*;
import org.jdom.Element;
import org.jdom.Document;
import org.jdom.output.XMLOutputter;
import org.jdom.input.SAXBuilder;
import org.jdom.Attribute;
import java.util.List;

public class AddToList extends HttpServlet
{
public Document getDocument(File sourceFile, PrintWriter errorsOut)
{
try
{
SAXBuilder builder = new SAXBuilder();
Document document = builder.build(sourceFile);
return document;
}
catch(JDOMException e)
{
errorsOut.print("there was a problem building the document: " e. getMessage()"<br/>"+ "Returning blank document.");
return new Document(new Element("blank"));
}
}

public void saveDocument(Document saveDoc, File saveFile, PrintWriter errorsOut)
{
try
{
FileOutputStream outStream= new FileOutputStream(saveFile);
XMLOutputter outToFile= new XMLOutputter(" ",true);
outToFile.output(saveDoc, outStream);
outStream.flush();
outStream.close();
}
catch (IOException e)
{
errorsOut.print("Can't save order.xml: " + e.getMessage()+"<br />");
}
}

public void addItem(Element orderElement, String product_id, String quant)
{
Element newItem =new Element("item");
newItem.setAttribute("product_id", product_id);
Element quantity =new Element("quantity");
quantity.addContent(quant);
newItem.addContent(quantity);
orderElement.addContent(newItem);
}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws IOException, ServletException
{
String thisProduct_id=request.getParameter("addProduct_id");
String thisQuantity=request.getParameter("addQuantity");
response.setContentType("text/html");

PrintWriter out= response.getWriter();
out.print("Adding "+ thisQuantity + "of item to chart "+ thisProduct_id +" ... ");

File orderFile = new File ("file:///c:/jdk1.3/orders.xml");
if(!orderFile.exists())
{
out.print("Creating ordersrocks....<br />");
Element root= new Element("orders");
root.addContent(" ");
Document document = new Document(root);
saveDocument (document, orderFile, out);
}
else
{
out.print("Orders File Exists.");
}
Document document =getDocument(orderFile, out);

HttpSession session =request.getSession(true);
String session_id= session.getId();

Element root =document.getRootElement();
List orders =root.getChildren();

int num_orders =orders.size();
boolean orderExists =false;
int orderIndex =0;
for(int i=0; i<num_orders; i++)
{
Element iOrder=(Element)orders.get(i);
String iOrder_id=iOrder.getAttributeValue("order_id");
if (iOrder_id.equals(session_id))
{
orderExists=true;
orderIndex=i;
break;
}
}
if(!orderExists)
{
Element order =new Element("order");
order.setAttribute("order_id", session_id);
Element status =new Element("order_status");
status.setText("open");
order.addContent(status);
addItem(order, thisProduct_id, thisQuantity);
root.addContent(order);
}
else
{
Element thisOrder=(Element)orders.get(orderIndex);
boolean itemExists=false;
int itemIndex =0;
List items =thisOrder.getChildren("item");
int num_items =items.size();
for(int i=0; i<num_items; i++)
{
Element iItem=(Element)items.get(i);
String iProduct_id =iItem.getAttribute("product_id").getValue();
if(iProduct_id.equals(thisProduct_id))
{
itemExists =true;
itemIndex =i;
break;
}
}
if(itemExists)
{
Element thisItem=(Element)items.get(itemIndex);
String currentQuantity= thisItem.getChildText("quantity");
int newQuantity = Integer.parseInt(currentQuantity)+ Integer.parseInt(thisQuantity);
String strQuantity= new String().valueOf(newQuantity)+1;
thisItem.getChild("quantity").setText(strQuantity);
}
else
{
addItem(thisOrder, thisProduct_id, thisQuantity);
}
}

saveDocument (document, orderFile, out);

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

}

When I compile above program, it gives me following error.

Error

C:\tomcat\webapps\book\WEB-INF\classes>javac AddToList.java

AddToList.java:19: unreported exception java.io.IOException; must be caught
or declared to be thrown

Document document = builder.build(sourceFile);

^
1 error

Any help regarding this will be appreciated

Thank you

Rocks