package examples.ejb.basic.beanManaged;
import java.io.IOException;
import java.io.OutputStream;
import java.rmi.RemoteException;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import weblogic.html.BreakElement;
import weblogic.html.HeadingElement;
import weblogic.html.ServletPage;
import weblogic.html.StringElement;
/**
* This servlet is a program similar to that in the
* <a href="examples.ejb.basic.beanManaged.Client.html">examples.ejb.basic.beanManaged.Client</a>
* example.
* <p>
* The servlet must be registered in the <code>weblogic.properties</code> file
* of the WebLogic Server:
* <p>
* <code>weblogic.httpd.register.beanManaged=examples.ejb.basic.beanManaged.Servlet</code>
* <code>weblogic.allow.execute.weblogic.servlet.beanManaged=<i>servletUser</i></code>
* <code>weblogic.password.<i>servletUser</i>=<i>servletUserPassword</i></code>
* <p>
* Call this servlet using an URL such as
* <p>
* <code>http://localhost:7001/beanManaged?user=servletUser&password=servletUserPassword</code>
* <p>
* where you've substituted appropriate values for <i>servletUser</i> and <i>servletUserPassword</i>
* in both the <code>weblogic.properties</code> file and the URL.
*
* @author Adapted by WebLogic, Inc.; adaptions copyright (c) 1998 by WebLogic, Inc. All Rights Reserved.
* @author <br>Adapted by BEA Systems, Inc.; adaptions copyright (c) 1998-2000 by BEA Systems, Inc. All Rights Reserved.
*/
public class Servlet extends HttpServlet {
static String accountId = "10020";
/**
* Builds an HTML page, finds the beanManaged home,
* creates beans and calls methods on the bean's remote interfaces.
*
* @param req HttpServletRequest
* @param res HttpServletResponse
* @exception java.io.IOException
* if there is an IO error
*/
public void service(HttpServletRequest req, HttpServletResponse res)
throws IOException
{
res.setContentType("text/html");
OutputStream out = res.getOutputStream();
String title = "EJBean Bean-managed Persistence Servlet";
ServletPage sp = new ServletPage(title);
sp.getBody()
.addElement(new HeadingElement(title, 1));
printElement("", sp);
// Get parameters off URL; example:
// "http://localhost:7001/beanManaged?user=foobar&password=FooBarNone"
String user = req.getParameter("user");
String password = req.getParameter("password");
if(user!=null && password!=null){
printElement("Using user <b>" + user
+ "</b> and password <b> " + password + "</b>", sp);
printElement("", sp);
} else {
printElement("No user and password credentials", sp);
printElement("", sp);
}
double amount = 100;
double balance = 3000;
Vector v = new Vector();
try {
// Contact the AccountBean container (the "AccountHome") through JNDI.
Context ctx = getInitialContext();
AccountHome home = (AccountHome) ctx.lookup("beanManaged.AccountHome");
// Find the Account or create it.
Account ac = null;
try {
printElement("Looking up account " + accountId + "...", sp);
ac = (Account) home.findByPrimaryKey(accountId);
}
catch (Exception ee) {
printElement("Did not find " + accountId, sp);
}
if (ac == null) {
printElement("Account " + accountId +
" being created; opening balance is $" + balance, sp);
ac = home.create(accountId, balance);
}
else {
printElement("Account " + accountId + " found; balance is $" + ac.balance(), sp);
}
printElement("", sp);
// Part A: Deposit and attempt to withdraw more than the current
// account balance. An application-specific exception should be thrown.
printElement("Part A: Depositing $" + amount, sp);
balance = ac.deposit(amount);
printElement("Current balance is $" + balance, sp);
printElement("", sp);
amount = balance + 10;
try {
printElement("Withdrawing amount greater than current balance. Expecting an exception...", sp);
balance = ac.withdraw(amount);
printElement("Error: expected an exception.", sp);
}
catch (ProcessingErrorException pe) {
printElement("Received expected Processing Error:<br>" + pe, sp);
}
printElement("", sp);
// Part B: Create some new accounts, with different initial balances.
// Find all the accounts with a balance greater than a specific value.
// When finished, the new accounts are removed.
int numAccounts = 5;
printElement("Part B: Creating " + numAccounts + " new accounts...", sp);
long now = System.currentTimeMillis();
for (int i = 0; i < numAccounts; i++) {
String id = "" + now + i; // unique account id
balance = i*100; // initial balance
v.addElement(home.create(id, balance));
printElement("Created account: " + id +
"; balance is $" + balance, sp);
}
printElement("", sp);
if (v.size() == numAccounts) {
printElement("" + numAccounts + " accounts successfully created", sp);
}
else {
printElement("Error: Only " + v.size() +
" accounts were created successfully", sp);
}
printElement("", sp);
double balanceGreaterThan = 200;
printElement("Querying for accounts with a balance greater than " +
balanceGreaterThan + "...", sp);
Enumeration e = home.findBigAccounts(balanceGreaterThan);
if (e != null) {
while (e.hasMoreElements()) {
Account bigAccount= (Account) e.nextElement();
printElement("Account " + bigAccount.getPrimaryKey() +
"; balance is $" + bigAccount.balance(), sp);
Thread.sleep(1000);
}
}
printElement("", sp);
printElement("Removing accounts just created...", sp);
for (int i = 0; i < numAccounts; i++) {
String id = "" + now + i;
((Account)(v.elementAt(i))).remove();
printElement("Removed account: " +id, sp);
}
printElement("", sp);
// Catch any exceptions
}
catch (ProcessingErrorException pe) {
printElement("Unexpected Processing Error: " + pe, sp);
}
catch (Exception e) {
printElement(":::::::::::::: Unexpected Error :::::::::::::::::", sp);
e.printStackTrace();
}
finally {
printElement("End beanManaged.Servlet...", sp);
}
sp.output(out);
out.flush();
}
/**
* Basic servlet information.
*/
public String getServletInfo() {
return "EJBean Servlet";
}
/**
* Prints to the HTML stream information on a bean.
*/
static private void printAccount(Account account, ServletPage sp)
throws RemoteException, IOException {
printElement("Account " + account.getPrimaryKey() +
"; balance is $" + account.balance(), sp);
}
/**
* Prints message to browser.
*/
static private void printElement(String message, ServletPage sp)
throws IOException {
sp.getBody()
.addElement(new BreakElement())
.addElement(new StringElement(message));
}
/**
* Gets an initial context for the current user, password and url.
*
* @return Context
* @exception java.lang.Exception if there is
* an error in getting the Context
*/
static public Context getInitialContext() throws Exception {
Properties p = new Properties();
p.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
return new InitialContext(p);
}
}