Help with chat plz
Hi im really new to java so this question must be kinda easy so plz help
Im able to connect several clients with threads to a central server but how am i able to send the msgs to all the clients connected?
Some simple code would be really apreciated.
thx a lot.
A Solution can be like this.
make a static object of class vector in your main server class.
static vector connections=null;
If you are unaware of Vector class,refer any JAVA book.
you may initialise it in your constructor.
Now whenever your client connects, the thread which will be responsible for handling the connections, adds to the vector object connections. As the object connections is static, you would be able to directly call it and add the hostname of the client which just got connected. It should be something like this....
mainclass.connections.AddItem( " Hostname" );
I forgot the vector class methods for adding up items....try refering the same in a book.
This way you will be able to maintain a list of clients connected on your server.
Hope this resolves ur problem ..
Regards
Arvind
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Hi,
I'm new to EBJs and am playing with an entity bean pretty much identical to the one on the J2EE tutorial but the home interface does not compile and I've got no idea why. Would really appreciate your help.
COMPILER COMPLAINT*****
C:\j2sdkee1.3\nim\src\ejb\addresses>javac AddressesHome.java
AddressesHome.java:7: cannot resolve symbol
symbol : class Addresses
location: interface AddressesHome
public Addresses Create(String id, String firstname, String lastname, St
ring address, int contactno) throws RemoteException, CreateException;
^
AddressesHome.java:10: cannot resolve symbol
symbol : class Addresses
location: interface AddressesHome
public Addresses FindByPrimaryKey(String id) throws FinderException, Rem
oteException;
^
2 errors
HOME INTERFACE*****
import java.util.Collection;
import java.rmi.RemoteException;
import javax.ejb.*;
public interface AddressesHome extends EJBHome
public Addresses Create(String id, String firstname, String lastname, String address, int contactno) throws RemoteException, CreateException;
public Addresses FindByPrimaryKey(String id) throws FinderException, RemoteException;
public Collection FindByLastName(String lastname) throws FinderException, RemoteException;
ADDRESSESSBEAN CLASS*****
import java.sql.*;
import javax.sql.*;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;
public class AddressesBean implements EntityBean
private String id;
private String firstname;
private String lastname;
private String address;
private int contactno;
private Connection conn;
private EntityContext context;
private String dbName = "java:comp/env/jdbc/AddressesdB";
public String ejbCreate(String id, String firstname, String lastname, String address, int contactno) throws CreateException
if(address == null || address.length() == 0)
throw new CreateException("You must specify an address");
try
insertRow(id, firstname, lastname, address, contactno);
catch(Exception e)
throw new EJBException("ejbCreate: " + e.getMessage());
this.id = id;
this.firstname = firstname;
this.lastname = lastname;
this.address = address;
this.contactno = contactno;
return id;
public void changeAddress(String address)
this.address = address;
public String getAddress()
return address;
public void changeContactno(int contactno)
this.contactno = contactno;
public int getContactno()
return contactno;
public String getFirstname()
return firstname;
public String getLastname()
return lastname;
public String ejbFindByPrimaryKey(String primaryKey) throws FinderException
boolean result;
try
result = selectByPrimaryKey(primaryKey);
catch(Exception e)
throw new EJBException("ejbFindByPrimaryKey: " + e.getMessage());
if(result)
return primaryKey;
else
throw new ObjectNotFoundException("Row for id " + primaryKey + " not found");
public Collection ejbFindByLastName(String lastname) throws FinderException
Collection result;
try
result = selectByLastName(lastname);
catch(Exception e)
throw new FinderException("ejbFindByLastName :" + e.getMessage());
return result;
public void ejbRemove()
try
deleteRow(id);
catch(Exception e)
throw new EJBException("ejbRemove : " + e.getMessage());
public void setEntityContext(EntityContext context)
this.context = context;
try
makeConnection();
catch(Exception e)
throw new EJBException("Unable to connect to database: " + e.getMessage());
public void unsetEntityContext()
try
conn.close();
catch(Exception e)
throw new EJBException("unsetEntityContext: " + e.getMessage());
public void ejbActivate()
id = (String)context.getPrimaryKey();
public void ejbPassivate()
id = null;
public void ejbLoad()
try
loadRow();
catch(Exception e)
throw new EJBException("ejbLoad: " + e.getMessage());
public void ejbStore()
try
storeRow();
catch(Exception e)
throw new EJBException("ejbStore: " + e.getMessage());
public void ejbPostCreate(String id, String firstname, String lastname, String address, boolean contactno)
/****************************** DataBase Routines ******************************/
private void makeConnection() throws NamingException, SQLException
InitialContext ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup(dbName);
conn = ds.getConnection();
private void insertRow(String id, String firstname, String lastname, String address, int contactno) throws SQLException
String insertStatement = "inset into ADDRESSES values (?, ?, ?, ?, ?)";
PreparedStatement prepStmt = conn.prepareStatement(insertStatement);
prepStmt.setString(1, id);
prepStmt.setString(2, firstname);
prepStmt.setString(3, lastname);
prepStmt.setString(4, address);
prepStmt.setDouble(5, contactno);
prepStmt.executeUpdate();
prepStmt.close();
private void deleteRow(String id) throws SQLException
String deleteStatement = "delete from ADDRESSES where id = ?";
PreparedStatement prepStmt = conn.prepareStatement(deleteStatement);
prepStmt.setString(1, id);
prepStmt.executeUpdate();
prepStmt.close();
private boolean selectByPrimaryKey(String primaryKey) throws SQLException
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PreparedStatement prepStmt = conn.prepareStatement(selectStatement);
prepStmt.setString(1, primaryKey);
ResultSet rs = prepStmt.executeQuery();
boolean result = rs.next();
prepStmt.close();
return result;
private Collection selectByLastName(String lastname) throws SQLException
String selectStatement = "select id from ADDRESSES where lastname = ? ";
PreparedStatement prepStmt = conn.prepareStatement(selectStatement);
prepStmt.setString(1, lastname);
ResultSet rs = prepStmt.executeQuery();
ArrayList a = new ArrayList();
while(rs.next())
String id = rs.getString(1);
a.add(id);
prepStmt.close();
return a;
private void loadRow() throws SQLException
String selectStatement = "select firstname, lastname, address, contactno from ADDRESSES where id = ?";
PreparedStatement prepStmt = conn.prepareStatement(selectStatement);
prepStmt.setString(1, this.id);
ResultSet rs = prepStmt.executeQuery();
if(rs.next())
this.firstname = rs.getString(1);
this.lastname = rs.getString(2);
this.address = rs.getString(3);
this.contactno = rs.getInt(4);
prepStmt.close();
else
prepStmt.close();
throw new NoSuchEntityException("Row for id " + id + " not found in the dataBase");
private void storeRow() throws SQLException
String updateStatement = "update ADDRESSES set firstname = ?, lastname = ?, address = ? contactno = ? where id = ?";
PreparedStatement prepStmt = conn.prepareStatement(updateStatement);
prepStmt.setString(1, firstname);
prepStmt.setString(2, lastname);
prepStmt.setString(3, address);
prepStmt.setInt(4, contactno);
prepStmt.setString(5, id);
int rowCount = prepStmt.executeUpdate();
prepStmt.close();
if(rowCount == 0)
throw new EJBException("Storing row for id " + id + " failed.");
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ca anyone help plz
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anyone know how i can fix these 2 errors:
Driver2.java:47: code is already defined in main(java.lang.String[])
String code = JOptionPane.showInputDialog(
^
Driver2.java:51: incompatible types
found : java.lang.String
required: int
int val = bc.getCode();
^
the case 2 in the driver is where it messes up, i believe..it works with just the case 1...any help/advice is appreciated(i am aware of spacing errors)
import javax.swing.JOptionPane;
import java.util.Scanner;
public class Driver2
public static void main(String[] args)
String userChoice;
int choice;
Scanner keyboard = new Scanner(System.in);
userChoice = JOptionPane.showInputDialog("Enter 1 to enter a numeric zip code:\n"
+ "Enter 2 to enter a bar code:\n"
+ "Enter 3 to exit program:\n");
choice = Integer.parseInt(userChoice);
while (choice != 3)
switch (choice)
case 1:
String input = JOptionPane.showInputDialog( "Please enter a five-digit zip code: ");
int num = Integer.parseInt(input);
BarCode bc = new BarCode(num);
String code = bc.getCode();
JOptionPane.showMessageDialog(null, "The barcode of the zip is: " + code);
System.exit(0);
break;
case 2:
String code = JOptionPane.showInputDialog( "Please enter bar code: ");
int val = bc.getCode();
if (val >= 0)
System.out.println("The zip code is: " + val);
else
System.out.println("Incorrect bar code data");
System.exit(0);
break;
case 3:
break;
userChoice = JOptionPane.showInputDialog("Enter 1 to enter a numeric zip code:\n"
+ "Enter 2 to enter a bar code:\n"
+ "Enter 3 to exit program:\n");
public BarCode(int n)
zip = n;
public String getCode()
String barCode = "|";
int sum = 0;
int temp = 0;
temp = zip / 10000;
sum = sum + temp;
Digit d1 = new Digit(temp);
barCode = barCode + d1.getCode();
zip = zip % 10000;
temp = zip / 1000;
sum = sum + temp;
Digit d2 = new Digit(temp);
barCode = barCode + d2.getCode();
zip = zip % 1000;
temp = zip / 100;
sum = sum + temp;
Digit d3 = new Digit(temp);
barCode = barCode + d3.getCode();
zip = zip % 100;
temp = zip / 10;
sum = sum + temp;
Digit d4 = new Digit(temp);
barCode = barCode + d4.getCode();
zip = zip % 10;
temp = zip;
sum = sum + temp;
Digit d5 = new Digit(temp);
barCode = barCode + d5.getCode();
temp = 10 - (sum % 10);
Digit d6 = new Digit(temp);
barCode = barCode + d6.getCode() + "|";
return barCode;
private int zip;
public class BarCode1
public BarCode1(int n)
zip = n;
public String getCode()
String barCode = "|";
int sum = 0;
int temp = 0;
temp = zip / 10000;
sum = sum + temp;
Digit d1 = new Digit(temp);
barCode = barCode + d1.getCode();
zip = zip % 10000;
temp = zip / 1000;
sum = sum + temp;
Digit d2 = new Digit(temp);
barCode = barCode + d2.getCode();
zip = zip % 1000;
temp = zip / 100;
sum = sum + temp;
Digit d3 = new Digit(temp);
barCode = barCode + d3.getCode();
zip = zip % 100;
temp = zip / 10;
sum = sum + temp;
Digit d4 = new Digit(temp);
barCode = barCode + d4.getCode();
zip = zip % 10;
temp = zip;
sum = sum + temp;
Digit d5 = new Digit(temp);
barCode = barCode + d5.getCode();
temp = 10 - (sum % 10);
Digit d6 = new Digit(temp);
barCode = barCode + d6.getCode() + "|";
return barCode;
private int zip;
public class Digit
public Digit(int n)
zip = n;
public String getCode()
String bar = "";
if (zip == 1)
bar = ":::||";
else if (zip == 2)
bar = "::|:|";
else if (zip == 3)
bar = "::||:";
else if (zip == 4)
bar = ":|::|";
else if (zip == 5)
bar = ":|:|:";
else if (zip == 6)
bar = ":||::";
else if (zip == 7)
bar = "|:::|";
else if (zip == 8)
bar = "|::|:";
else if (zip == 9)
bar = "|:|::";
else
bar = "||:::";
return bar;
private int zip;
public class Digit1
public Digit1(int n)
zip = n;
public String getCode()
String bar = "";
if (zip == 1)
bar = ":::||";
else if (zip == 2)
bar = "::|:|";
else if (zip == 3)
bar = "::||:";
else if (zip == 4)
bar = ":|::|";
else if (zip == 5)
bar = ":|:|:";
else if (zip == 6)
bar = ":||::";
else if (zip == 7)
bar = "|:::|";
else if (zip == 8)
bar = "|::|:";
else if (zip == 9)
bar = "|:|::";
else
bar = "||:::";
return bar;
private int zip;
}> i got it to compile now...i can toy around w/
it..thanks for the help
Good.
Stick with this handle, ok?I must say I am not thrilled with
a) when I questioned the first post of WhiteSox asking if it was bugz or a classmate or what I was ignored by the OP
b) I guess the OP is trying to distance himself from his very first thread where somebody did part of his homework for him with results that are now plainly evident. As I predicted at the end of the last thread.
http://forum.java.sun.com/thread.jspa?threadID=703258 Reply 11
I hope that matsabigman and others who help homework posters by doing it for them will take note of the results of this help thus far. Not much good has come of this.
BigMan/WhiteSox I am still detecting a fundamental lack of basic concepts on your part. This is the underlying cause of your compile errors but those are only a symptom. You can continue treating the symptoms but it would be a better use of your time to treat the disease, which in this case means spending some time getting a better grasp of Java fundamentals. -
I've been able to modify the server java application example from the Java Sun website, that accepts multiple connections but the problem now is how to send the message received from one client to all clients..
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Quote
3D Mark 2005 reports the core clock to be 375 when according to the MSI site it should be 500 MHz, and the video memory speed is 0.0 MHz, does any one know whats wrong?
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