Example of using JAVA to implement location transparency
Dear all,
Is any example or source code show me how to using JAVA to implement location transparency?
Thanks
Ronnie Poon
<frameset> should not be the child of the <body> element. It should be the child of <html> element.
This works:
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="1.2" xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:ui="http://www.sun.com/web/ui">
<jsp:directive.page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"/>
<f:view>
<ui:page id="page1">
<ui:html id="html1">
<ui:head id="head1">
<ui:link id="link1" url="/resources/stylesheet.css"/>
</ui:head>
<frameset cols="30%,70%">
<frame name="left" src="faces/Page1.jsp"/>
<frameset rows="80%,20%">
<frame name="top" src="faces/rightPage.jsp"/>
<frame name="bottom" src="faces/bottomPage.jsp"/>
</frameset>
</frameset>
</ui:html>
</ui:page>
</f:view>
<ui:form binding="#{bean.form1}" id="form1"/>
</jsp:root>
thanks,
tsc
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Last year I posted 4 programs that provided a simple client server using both stream sockets and NIO. I decided as an exercise in using Java 5 to port that code and try to use as many of the new features as possible. The following code is very long and does what all the previous example programs did. In replies do not repost the whole of this message.
It provides a simple chat like client and server. The user can request either a stream connection or a NIO connection or provide one of their own.
//========================== MsgSwitch.java ===========================//
package pkwnet.msgswitch;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.logging.Handler;
* main class for message switch
* command line arguments are
* -p port number for server
* -s run server
* -a server ip address including port for client
* -i idle timer in seconds
* -n use NIO
* -c specify connection class
public class MsgSwitch {
static private int errors = 0;
static private String address = "127.0.0.1:6060";
static private String connectionClass = "pkwnet.msgswitch.StreamConnection";
static public void main(String [] args) {
int port = 6060;
int idleTime = 600;
boolean server = false;
boolean nio = false;
Logger logger = Logger.getLogger("msgswitch");
for(String arg : args) {
if(arg.startsWith("-a")) {
address = arg.substring(2);
} else if(arg.startsWith("-p")) {
port = argToInt(arg);
server = true;
} else if(arg.startsWith("-i")) {
idleTime = argToInt(arg);
} else if (arg.startsWith("-s")) {
server = true;
} else if (arg.startsWith("-c")) {
connectionClass = arg.substring(2);
} else if (arg.startsWith("-n")) {
connectionClass = "pkwnet.msgswitch.NIOConnection";
} else {
String err = "unknown argument=" + arg;
logger.severe(err);
System.err.println(err);
errors++;
if (errors == 0) {
if (server) {
new Server().listen(port,idleTime, nio);
} else {
new Client().start(address, nio);
} else {
fail(errors + " errors encountered", null);
static private int argToInt(String arg) {
int val = 0;
try {
val = Integer.parseInt(arg.substring(2));
} catch (NumberFormatException e) {
String err = "invalid argument format: " + arg;
Logger.getLogger("msgswitch").severe(err);
System.err.println(err);
errors++;
return val;
static public void fail(String err, Throwable e) {
String msg = "Operation terminated: " + err;
Logger.getLogger("msgswitch").log(Level.SEVERE, msg, e);
System.err.println(msg);
System.exit(12);
static public Connection getConnection() {
Connection conn = null;
try {
conn = (Connection) Class.forName(connectionClass).newInstance();
} catch (Exception e) {
fail ("connection class error", e);
return conn;
static public void logCaller(Logger logger, Level level) {
String text = "CALLED";
if (logger.isLoggable(level)) {
try {
throw new Exception("logging stack");
} catch (Exception e) {
StackTraceElement [] st = e.getStackTrace();
if (st.length > 1) {
text += formatElement(st[1]);
if (st.length >2) {
text += formatElement(st[2]);
logger.log(level, text);
static private String formatElement(StackTraceElement ste) {
return "\n " + ste.getClassName() + "." + ste.getMethodName()
+ "(" + ste.getFileName() + ":" + ste.getLineNumber() + ")";
//================= Client.java =============================================//
package pkwnet.msgswitch;
* a simple Swing chat GUI using Java 5 and sockets.
* @author PKWooster
* @version 1.0 August 31,2005
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JMenu;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JDialog;
import javax.swing.SwingUtilities;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.BorderLayout;
import static java.awt.BorderLayout.*;
client GUI class
public class Client extends JFrame implements ConnectionListener {
// swing GUI components
private JTextField userText = new JTextField(40);
private JTextArea sessionLog = new JTextArea(24,40);
private JTextField statusText = new JTextField(40);
private JPanel outPanel = new JPanel();
private JScrollPane sessionLogScroll = new JScrollPane(sessionLog);
private JMenuBar menuBar = new JMenuBar();
private JMenuItem startItem = new JMenuItem("Start");
private JMenuItem hostItem = new JMenuItem("Host");
private JMenuItem aboutItem = new JMenuItem("About");
private JMenuItem abortItem = new JMenuItem("Abort");
private JMenuItem exitItem = new JMenuItem("Exit");
private JMenu fileMenu = new JMenu("File");
private JMenu helpMenu = new JMenu("Help");
private Container cp;
private String address;
private Connection connection;
private boolean sendReady = false;
private boolean nio = false;
Client() {
public void start(String address, boolean nio) {
this.address = address;
this.nio = nio;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
runClient();
private void runClient() {
connection = MsgSwitch.getConnection();
connection.addConnectionListener(this);
buildMenu();
cp = getContentPane();
sessionLog.setEditable(false);
outPanel.add(new JLabel("Send: "));
outPanel.add(userText);
// enter on userText causes transmit
userText.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){userTyped(evt);}
cp.setLayout(new BorderLayout());
cp.add(outPanel,NORTH);
cp.add(sessionLogScroll,CENTER);
cp.add(statusText,SOUTH);
setStatus("Closed");
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
mnuExit();
pack();
setVisible(true);
* attempt to send the contents of the user text field
private void userTyped(ActionEvent evt) {
if (sendReady) {
String txt = evt.getActionCommand()+"\n";
userText.setText("");
toSessionLog("> ", txt);
sendReady = false;
connection.send(txt);
* append text to the session log
private void toSessionLog(String prefix, String txt) {
sessionLog.append(prefix + txt);
sessionLog.setCaretPosition(sessionLog.getDocument().getLength() ); // force last line visible
* build the standard menu bar
private void buildMenu()
JMenuItem item;
// file menu
startItem.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e){mnuStart();}});
fileMenu.add(startItem);
hostItem.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e){mnuHost();}});
fileMenu.add(hostItem);
exitItem.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e){mnuExit();}});
fileMenu.add(exitItem);
menuBar.add(fileMenu);
helpMenu.add(aboutItem);
aboutItem.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e){mnuAbout();}});
menuBar.add(helpMenu);
setJMenuBar(menuBar);
* start and stop communications from start menu
private void mnuStart() {
if(connection.getState() == Connection.State.CLOSED) {
connection.connect(address);
} else {
connection.disconnect();
* prompt user for host in form address:port
private void mnuHost() {
String txt = JOptionPane.showInputDialog("Enter host address:port", connection.getAddress());
if (txt == null)return;
address = txt;
private void mnuAbout() {
JDialog dialog = new JDialog(this, "About Client");
JTextField text = new JTextField("Simple character client");
dialog.getContentPane().add(text);
dialog.pack();
dialog.setVisible(true);
// exit menu
private void mnuExit() {
exit();
private void exit() {
connection.disconnect();
System.exit(0);
private void setStatus(String st) {
statusText.setText(st);
private void setStatus(Connection.State state) {
switch(state) {
case OPENED:
startItem.setText("Stop");
setStatus("Connected to "+address);
break;
case CLOSED:
startItem.setText("Start");
setStatus("Disconnected");
break;
case OPENING:
setStatus("Connecting to "+address);
startItem.setText("Abort");
break;
case CLOSING:
setStatus("Disconnecting from "+address);
startItem.setText("Abort");
break;
public void stateChanged(final ConnectionEvent event) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
setStatus(event.getState());
public void dataAvailable(final ConnectionEvent event) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
setStatus(event.getState());
String txt = event.getData();
if (txt == null) {
txt = "$null$";
toSessionLog("< ", txt + "\n");
public void sendAllowed(final ConnectionEvent event) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
setStatus(event.getState());
sendReady = true;
public void accept(ConnectionEvent event) {
//========================== Server.java ===============================//
package pkwnet.msgswitch;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
* a simple message switch using stream based socket i/o
* a very simple text message switching program
* user commands start with $ and consist of blank seperated arguments
* other lines sent by the user are forwarded
* $on nickname targets
* sign on as nickname, sending to targets
* $to targets
* change target list, reports current value
* $list nicknames
* list status of specified nicknames
* $list
* list all connected users
* $off
* sign off
* @author PKWooster
* @version 1.0 September 1, 2005
public class Server {
private ConcurrentHashMap<String, User> perUser = new ConcurrentHashMap<String,User>();
private Timer idleTimer;
private Connection conn;
public void listen(int port, final int idleTime, boolean nio) {
idleTimer = new Timer();
idleTimer.scheduleAtFixedRate(new TimerTask(){public void run(){oneSec();}},0,1000);
conn = MsgSwitch.getConnection();
conn.addConnectionListener(new ConnectionListener() {
public void stateChanged(ConnectionEvent event) {
public void dataAvailable(ConnectionEvent event) {
public void sendAllowed(ConnectionEvent event) {
public void accept(ConnectionEvent event) {
Connection uconn = event.getConnection();
new User(uconn, perUser, idleTime);
conn.listen(port);
idleTimer.cancel();
private void oneSec() {
Collection<User> uc = perUser.values();
for(User u : uc) {
u.oneSec();
//================= User.java ==============================================//
package pkwnet.msgswitch;
import java.io.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
import java.util.logging.Level;
* defines the processing for a message switch user
* @author PKWooster
* @version 1.0 June 15,2004
public class User implements ConnectionListener {
private ConcurrentHashMap<String, User> perUser;
private String name;
private String address;
private boolean signedOn = false;
private String[] targets;
private AtomicInteger remainingTime;
private int idleTime;
Connection conn;
Logger logger;
* construct a user, link it to its connection and put it in the perUser table
User(Connection conn, ConcurrentHashMap<String,User>p, int idle) {
this.conn = conn;
logger = Logger.getLogger("msgswitch.user");
conn.addConnectionListener(this);
address = conn.getAddress();
logger.info("creating user " + address);
perUser = p;
idleTime = idle;
remainingTime = new AtomicInteger(idleTime);
rename(address);
targets = new String[0];
* process state changes
public void stateChanged(ConnectionEvent event) {
if(event.getState() == Connection.State.CLOSED) {
close(false);
* data is available, process commands and forward other data.
public void dataAvailable(ConnectionEvent event) {
String msg = event.getData();
if (msg.startsWith("$")) {
doCommand(msg);
} else {
forward(msg);
remainingTime.set(idleTime);
* do nothing for sendAllowed events
public void sendAllowed(ConnectionEvent event) {
* do nothing for accept events
public void accept(ConnectionEvent event) {
* called once per second by the server main thread.
public void oneSec() {
if(idleTime != 0 && 1 > remainingTime.decrementAndGet()) {
close(true);
* send a message
private void send(String msg) {
conn.send(msg);
remainingTime.set(idleTime);
* forward data messages to other users
* @param txt the message to send
private void forward(String txt) {
txt = name+": "+txt + "\n";
if(0 < targets.length) {
for(String target :targets) {
User user = perUser.get(target);
if(user != null) {
user.send(txt);
} else {
for (User user : perUser.values()) {
if (user != this) {
user.send(txt);
* execute command messages, commands start with a $
* and contain arguments delimited by white space.
* @param command the command string
private void doCommand(String command) {
boolean good = false;
command = command.substring(1).trim();
if(command.length() > 0) {
String [] args = command.split("\\s+");
if(args[0].equals("on")) {
good = signOn(args);
} else if(args[0].equals("off")) {
good = signOff(args);
} else if(args[0].equals("list")) {
good = listUsers(args);
} else if(args[0].equals("to")) {
good = setTargets(args,1);
} else if(args[0].equals("idle")) {
good = setIdle(args);
if(!good) {
send("invalid command=" + command + "\n");
* sign on command
private boolean signOn(String [] args) {
boolean good = false;
if(args.length >1) {
String nm = args[1];
logger.info("signing on as: " + nm);
if(rename(nm)) {
conn.setName(name);
send("Signed on as " + name + "\n");
signedOn = true;
good = true;
setTargets(args,2);
} else {
send("name="+nm+" already signed on\n");
return good;
* set forwarding targets
private boolean setTargets(String [] args, int start) {
if(start < args.length) {
targets = new String[args.length-start];
System.arraycopy(args, start, targets, 0, targets.length);
String str = "to=";
for(String target : targets) {
str += (target + " ");
send(str+"\n");
return true;
* set idle timeout
private boolean setIdle(String[] args) {
try {
idleTime = new Integer(args[1]).intValue();
remainingTime.set(idleTime);
send("idle time set to "+idleTime+"\r\n");
return true;
} catch(NumberFormatException exc) {
return false;
* sign off
private boolean signOff(String [] args) {
close(true);
return true;
* list connected users
private boolean listUsers(String [] args) {
TreeSet<String> allUsers = new TreeSet<String>(perUser.keySet());
HashSet<String> t = new HashSet<String>(Arrays.asList(targets));
LinkedList<String> users;
String response = "On,Target,Nickname\n";
if(args.length < 2) {
users = new LinkedList<String>(allUsers);
} else {
users = new LinkedList<String>();
for (int i = 1; i < args.length; i++) {
users.add(args);
for(String username : users) {
if(username.equals(name)) {
response += "*,";
} else {
response += (allUsers.contains(username) ? "y," : "n,");
response += (t.contains(username) ? "y," : "n,");
response += (username + "\n");
send(response);
return true;
* rename this user, first we attempt to add the new name then we remove
* the old one. Both names will be registered for a short while.
* @param newname the new name for this user
* @return true if the rename was successful
private boolean rename(String newname) {
boolean b = false;
logger.info("rename name="+name+" newname="+newname);
if (name != null && name.equals(newname)) {
b = true;
} else if (null == perUser.putIfAbsent(newname, this)) {
if (name != null) {
perUser.remove(name);
name = newname;
b = true;
return b;
* delete from perUser and close our connection
private void close(boolean disconnect) {
logger.info("closing user "+name);
perUser.remove(name);
if (disconnect) {
conn.disconnect();
//====================== Connection.java ===============================//
package pkwnet.msgswitch;
import java.util.HashSet;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Logger;
import java.util.logging.Level;
public abstract class Connection {
public enum State {CLOSED, OPENING, OPENED, CLOSING}
private HashSet<ConnectionListener> listeners = new HashSet<ConnectionListener>();
private State state = State.CLOSED;
private String host = "127.0.0.1";
private int port = 6060;
private String name = "unconnected";
public Connection() {
public abstract void listen(int port);
public abstract void connect(String address);
public abstract void disconnect();
public abstract void send(String message);
public void addConnectionListener(ConnectionListener listener) {
listeners.add(listener);
public void removeConnectionListener(ConnectionListener listener) {
listeners.remove(listener);
protected void fireDataAvailable(String data) {
for (ConnectionListener listener : listeners) {
listener.dataAvailable(new ConnectionEvent(this, state, data));
private void fireStateChanged() {
for (ConnectionListener listener : listeners) {
listener.stateChanged(new ConnectionEvent(this, state));
protected void fireSendAllowed() {
for (ConnectionListener listener : listeners) {
listener.sendAllowed(new ConnectionEvent(this, state));
protected void fireAccept(Connection conn) {
for (ConnectionListener listener : listeners) {
listener.accept(new ConnectionEvent(this, conn));
protected void setState(State state) {
if (this.state != state) {
this.state = state;
fireStateChanged();
public State getState() {
return state;
protected void setAddress(String address) {
int n = address.indexOf(':');
String pt = null;
setName(address);
if(n == 0) {
host = "127.0.0.1";
pt = address.substring(1);
else if(n < 0) {
host = address;
port = 5050;
} else {
host = address.substring(0,n);
pt = address.substring(n+1);
if (pt != null) {
try {
port = Integer.parseInt(pt);
} catch (NumberFormatException e) {
port = -1;
public String getName() {
return name;
public void setName(String value) {
name = value;
public String getAddress() {
return host + ":" + port;
public String getHost() {
return host;
public void setPort(int value) {
port = value;
public int getPort() {
return port;
//=================== ConnectionEvent.java ================================//
package pkwnet.msgswitch;
public class ConnectionEvent extends java.util.EventObject {
private final String data;
private final Connection.State state;
private final Connection conn;
public ConnectionEvent(Object source, Connection.State state, String data, Connection conn) {
super(source);
this.state = state;
this.data = data;
this.conn = conn;
public ConnectionEvent(Object source, Connection.State state, String data) {
this(source, state, data, null);
public ConnectionEvent(Object source, Connection.State state) {
this(source, state, null, null);
public ConnectionEvent(Object source, Connection conn) {
this(source, conn.getState(), null, conn);
public Connection.State getState() {
return state;
public String getData() {
return data;
public Connection getConnection() {
return conn;
//============================ ConnectionListener.java ===================//
package pkwnet.msgswitch;
public interface ConnectionListener extends java.util.EventListener {
public void stateChanged(ConnectionEvent event);
public void dataAvailable(ConnectionEvent event);
public void sendAllowed(ConnectionEvent event);
public void accept(ConnectionEvent event);
//============================ StreamConnection.java ===================//
package pkwnet.msgswitch;
import java.net.Socket;
import java.net.ServerSocket;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Logger;
import java.util.logging.Level;
* provides stream socket i/o of character strings
* @author PKWooster
* @version 1.0 September 1, 2005
public class StreamConnection extends Connection {
private Socket sock;
private BufferedReader in;
private BufferedWriter out;
private Thread recvThread = null;
private Thread sendThread = null;
protected LinkedBlockingQueue<String> sendQ;
Logger logger;
public StreamConnection() {
super();
logger = Logger.getLogger("msgswitch.stream");
sendQ = new LinkedBlockingQueue<String>();
* open a socket and start i/o threads
public void connect(String ipAddress) {
setAddress(ipAddress);
try {
sock = new Socket(getHost(), getPort());
connect(sock);
} catch (IOException e) {
logger.log(Level.SEVERE, "Connection failed to=" + ipAddress, e);
private void connect(Socket sock) {
this.sock = sock;
String ipAddress = getAddress();
try {
in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
out = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream()));
recvThread = new Thread(new Runnable() {
public void run() {
doRecv();
},"Recv." + getName());
sendThread = new Thread(new Runnable() {
public void run() {
doSend();
},"Send."+getName());
sendThread.start();
recvThread.start();
setState(State.OPENED);
} catch(IOException e) {
logger.log(Level.SEVERE, "Connection failed to="+ipAddress, e);
public void listen(int port) {
StreamConnection sconn;
setPort(port);
try {
ServerSocket ss = new ServerSocket(port);
while(true) {
Socket us = ss.accept();
sconn = new StreamConnection();
String ipAddress = us.getInetAddress() + ":" + us.getPort();
sconn.setAddress(ipAddress);
sconn.connect(us);
fireAccept(sconn);
} catch(Exception e) {
logger.log(Level.SEVERE, "listen failed", e);
* close the socket connection
public void disconnect() {
logger.fine("disconnect sock=" + sock + " state="+ getState());
if(getState() == State.OPENED) {
setState(State.CLOSING);
try {
sock.shutdownOutput();
} catch(IOException ie) {
logger.log(Level.SEVERE, "showdown failed", ie);
} else if(getState() != State.CLOSED) {
try {
sock.close();
} catch(Exception e) {
logger.log(Level.SEVERE, "close failed", e);
if (sendThread.isAlive()) {
sendThread.interrupt();
sendQ.clear();
setState(State.CLOSED);
public void send(String message) {
if (getState() == State.OPENED) {
try {
sendQ.put(message);
} catch(InterruptedException e) {
logger.log(Level.SEVERE, "sendQ put interrupted", e);
setState(State.CLOSING);
disconnect();
* sets the public name of this connection
public void setName(String name) {
super.setName(name);
if (sendThread != null) {
try {
recvThread.setName("recv." + name);
sendThread.setName("send." + name);
} catch(Exception e) {
logger.log(Level.SEVERE, "nameing threads failed", e);
* the main loop for the send thread
private void doSend() {
String msg;
boolean running = true;
while (running) {
if (sendQ.size() == 0) {
fireSendAllowed();
try {
msg = sendQ.take();
out.write(msg);
out.flush();
} catch(Exception e) {
if (getState() == State.OPENED) {
logger.log(Level.SEVERE, "write failed", e);
setState(State.CLOSING);
disconnect();
running = false;
* the main loop for the receive thread
private void doRecv() {
String inbuf;
while (getState() == State.OPENED) {
try {
inbuf = in.readLine();
} catch(Exception e) {
if (getState() == State.OPENED) {
logger.log(Level.SEVERE, "readline failed", e);
inbuf = null;
if(inbuf == null) {
logger.fine("null received on: " + getAddHere are three of them:
NIO server
NIO client
Multithreaded server
The stream based client example seems to have been deleted, probably lost in the troll wars. I also posted a new Simple multithreaded server that uses the same protocol. As the client is missing, I'll repost it. -
How to implement route cipher using java?
Hi guys,,,
I really got a headache solving how to implement route cipher using java lang,,i already got the concept but i really dont get how to implement it using java actually i want to make a presentation of how route cipher works using "adobe flash" but first i will implement it using java coz flash actionscripts are closer to java lang.
Hope you could post some examples or ideas...i would really appreciate it!
thank you so much...just add an action listener (either keypressed or keytyped) to the frame that you want to record. I did this in NetBeans in about 2 seconds. I can simplify it if you need. As for loging it just write the characters to a file output stream.
public class test extends javax.swing.JFrame {
/** Creates new form test */
public test() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
formKeyTyped(evt);
pack();
// </editor-fold>
private void formKeyTyped(java.awt.event.KeyEvent evt) {
System.out.println(evt.getKeyChar());
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new test().setVisible(true);
// Variables declaration - do not modify
// End of variables declaration
} -
RFC Lookup using Java Mapping program - Examples
Dear Experts,
I am working on a scenario which is using 1:N mapping. For deciding the target message I have to use RFC Lookup to call the backend ERP system and there are 2 ERP systems involved in this integration. As I am using Java Mapping and never did a RFC Lookup in Java. I kindly request you to give me some examples which I could use for my RFC calls in my Java Mapping. Simple example will do.
Client is adamant to use Java mapping, I could achieve this easily using XSLT or Graphical Mapping.
Advance Thanks,
PradeepHello,
why don't you use Extended Receiver Determination Defining Extended (Dynamic) Receiver Determination - Integration Directory - SAP Library?
What you can do is create a Message Mapping between your source message and Receivers message type. In this message mapping you can use your RFC to generate the target message.
For example, lets say we have the function ZFM_GET_INTERFACE_INFO used to generate the List of Receivers given a source message. You could create a Message Mapping as below:
In this case, the RFCLookup box look as below:
The receiver determination configuration would look as follows:
Afterwards, you will need two specific message mappings for the two ERP systems.
Summarizing, you'll need:
1.- A Message Mapping: Source Message to Receivers Message Type (This one uses the RFC Lookup)
2.- A Message Mapping: Source Message to Target Message for ERP 1
3.- A Message Mapping: Source Message to Target Message for ERP 2
In Integration Directory you'll have 1 Receiver Determination(Source system, Target System determined Dynamically) and 2 Interface Determinations (Source System to ERP1, Source System to ERP2), etc.
I hope you find it useful.
Regards! -
Creating Web Services using Java Implementation
Hi,
This is quite a general question on how to create a Web Service using Java Implementation that needs to conform to a client XML schema.
Here are my Version specs,
I am using Jdeveloper 10.1.3.4.0 and deploying onto OAS 10.1.3.
I will be creating a J2ee 1.4 (JAX-RPC) Web Service using Document/Wrapped style.
I have been provided an XML schema from the client which is quite complex.
Using a top-down approach, I can create my WSDL file and import the XML Schema for my type definitions.
The Web service aim is to accept some parameters and return some data from the Oracle Database. The
XML response from the web service must conform to the element, attribute definitions in the provided XML schema.
From a Java implementation approach, what is the best (simplest or quickest) way to retrieve data from the Oracle
tables and map each fields/column to the required XML output (defined in the XML schema).
I'm not too concerned with using Java to retrieve data from the Database, more with how I can map the data returned
to the required output. Can this mapping task be controlled within the Java program?
Thanks in advance.Hi,
This is quite a general question on how to create a Web Service using Java Implementation that needs to conform to a client XML schema.
Here are my Version specs,
I am using Jdeveloper 10.1.3.4.0 and deploying onto OAS 10.1.3.
I will be creating a J2ee 1.4 (JAX-RPC) Web Service using Document/Wrapped style.
I have been provided an XML schema from the client which is quite complex.
Using a top-down approach, I can create my WSDL file and import the XML Schema for my type definitions.
The Web service aim is to accept some parameters and return some data from the Oracle Database. The
XML response from the web service must conform to the element, attribute definitions in the provided XML schema.
From a Java implementation approach, what is the best (simplest or quickest) way to retrieve data from the Oracle
tables and map each fields/column to the required XML output (defined in the XML schema).
I'm not too concerned with using Java to retrieve data from the Database, more with how I can map the data returned
to the required output. Can this mapping task be controlled within the Java program?
Thanks in advance. -
How to use Java NIO to implement disk cache for serialized java objects
Hi,
I have a cache (implemented as hahstable etc.) that contains java objects (mostly strings) and swaps objects from runtime memory to the disk and back based on some algorithms. Currently, the reading and writing from the disk is implemented using java.io.* package i.e. fileInputstream and FileOutputStream. Essentially, I serialize the java object and write to the disk and the deserialize and give it back to the Hashtable cache.
The performance of swapping from disk to memory is kinda slow. I have read that memory mapping would improve the performance.
My idea is to do the following:
Have one big file mapped to memory. I write the serialized objects to different portions of the file and then read those portions when needed. I can use the MappedByteBuffer for that but then I have the following questions. I will not store objects in the hashtable anymore.
1. How do I delete things from the cache in the above design i.e. how do I delete portions of a mapped file?
2. How do I serialize objects using ByteBuffers and then deserialize them? I guess this shouldn't be hard but just want to confirm.
Do you think this is the right design or should I change? Right now using the old io package, I have a separate file for each object. When using the NIO package, I want to store all objects in a single file in different portions of the file, is that the right way to go?
As you can see, I am beginner in memory mapped io and need help.Have one big file mapped to memory. I write the serialized objects to different portions of the file and then read those portions when needed. I can use the MappedByteBufferThis is a good idea, one that I have worked on. It involves quite a bit of manipulation with temporary buffers and a deep working knowledge of object serialization.
1. How do I delete things from the cache in the above design i.e. how do I delete portions of a mapped file?The best way to handle this is do a two-step process, cutting the file into two pieces and gluing it back together where the original one is...
2. How do I serialize objects using ByteBuffers and then deserialize them? I guess this shouldn't be hard but just want to confirm.It is hard. Wrapping the streams and making the IO work properly is not the challenge however. The hard part comes in hacking the object streams. The object input/output streams use a ClassDescriptor object which only gets written once/ read once. This shouldn't be a problem if you will read/write the entire file at once, but will bring you grief if you want random access to your objects. You will also need an indexing mechanism to support random access.
Do you think this is the right design or should I change? Right now using the old io package, I have a separate file for each object. When using the NIO package, I want to store all objects in a single file in different portions of the file, is that the right way to go?I guess it depends on your needs. Do you require random access to objects? NIO provides some performance gains, but mostly for very large amounts of data (>10M in my experience).
You can always write all your objects into the same file using normal io techniques and you can still generate an index and acheive random access. It might be easier...
Good luck -
We have a requirement to print the w2 forms for employees using java application, how can i implement this. Please give some suggestion.
Anyone any ideas to help please?
-
Implementing n-tier Architecture using java
Hi !!
I wish to know how I can proceed to implement n-tier application using java
or how to implement n-tier application with JBuilder.
Thanks!Easypublic class nTier {
public static void main(String[] args) {
int n =5;
for (int i=0; i<n; i++) {
System.out.println(i + " tier");
}Ted. -
Whenever I use something which uses Java (for example, an online game) and then click the address bar, it seems that the address bar is disabled. I cannot highlight or type in the address bar unless I interact with another program and then switch back to Firefox. When I interact with Java again, the same problem persists! Help!
Sorry, I didn't know what category this should be under, but it's urgent.Perform the suggestions mentioned in the following articles:
* [https://support.mozilla.com/en-US/kb/Template:clearCookiesCache/ Clear Cookies & Cache]
* [[Troubleshooting extensions and themes]]
Check and tell if its working.
Some of your Firefox Plugins are out-dated
* Update All your Firefox Plugins -> [https://www.mozilla.org/en-US/plugincheck/]
* '''When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)''' -
How advantages of "Call By Reference" can be implemented using Java
As I know that java doesnot support "Call By Reference" as C++
does.
I want to know that how advantages of Call by Reference can be
implemented using Java.There is some misunderstanding here. Method arguments in Java are passed by value. However, if you pass a reference (to an object) by value, you can still modify the object that the (copy of the) reference points to.
public void method1() {
StringBuffer buf = new StringBuffer();
// Here, method2 cannot change the value of the variable buf,
// but it can modify the object that buf points to.
method2(buf);
public void method2(StringBuffer sb) {
// You can modify the StringBuffer.
sb.append("hello");
// But this is useless, it will not change the variable buf
// in the calling method.
sb = new StringBuffer();
}Jesper -
Implementing partialTriggers using java code???
Can we perform Partial Trigger on a component using java code?
For example,
I have a textBox component and a commandButton.If bind partialTriggers attribute of the textBox to the commandButton, it gets renedered whenever I click the commandButton.
Can I acheive the same,by writing some piece of java code inside the action listener of commandButton?
Regards,
Lokesh.If you bind the component to a bean attribute (i.e. attrXYZ) you can use
RequestContext.getCurrentInstance().addPartialTarget(attrXYZ);in the listener to update it.
Timo -
Unable to locate existing file from unix using java program
Hi
I have created a file in unix using java program, file.createNewFile();
And when i try to search for the same file using file.exists() it is returning false. Paths are correct. Can anybody help me out.
Thanks & Regards,
PrasanthIn Linux FC5 using JDK1.6, this code File temp = new File(System.getProperty("user.home") + "/abcdefghijklmn");
System.out.println(temp.createNewFile());prints 'true' and the file is created with length zero. -
Implement Firewall by using Java
I want to create a firewall(3rd layer) by using Java. Is it possible? Is there any class for these purposes?
I'm not sure if the "DatagramPacket" is the class that I'm looking for.
What is the lower level of network programming which is supported by Java?
Thankshm, although i'm not in the "java is too slow" camp i'm still surprised. but then, when using a box as dedicated firewall, java performance is surely good enough.
what made me wonder is that java does not give access to network functionality on a low level which is required for packet filtering. so it would only be feasible to accomplish an application level firewall. i'm no expert at this but i would guess that this kind of firewall has more overhead than a packet filtering firewall.
some research revealed that only the frontend seems to be written in java while the firewall is a configured linux system:
Developed with NetMaster's own Linux distribution tailored specifically for firewall applications, Gateway Guardian is a very flexible, high-end firewall that takes a revolutionary approach to allowing a company to use a lower-end PC as their Internet gateway. Running on a PC that is not the Internet gateway, Gateway Guardian uses a pure Java application to preconfigure hardware, Internet provider settings, and firewall rules through a wizard like format. When the information has been entered, the Java application writes an entire Linux operating system and the custom firewall configuration onto a 3-1/4" floppy diskette.
http://online.securityfocus.com/products/category/134
Gateway Guardian (see Resources) is a one-floppy Linux distribution customized for ipchains-based firewalls. Guardian was developed by NetMaster Solutions and uses a Java GUI application to configure hardware, network settings, and firewall rules through a wizard-like format. When the information has been entered, the Java application writes a Linux image and the custom firewall configuration onto a floppy diskette.
http://www.linuxworld.com/linuxworld/lw-2000-10/lw-10-fwproducts2-p5.html
see here as well:
http://techupdate.zdnet.com/techupdate/stories/main/0,14179,2806287,00.html
any more insights?
robert
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