CS 245 Lecture 27 – Sockets
Agenda
- what ?s
- getting the time of day from a time server
- get the time of sunset from OpenWeatherMap
- getting rhymes from RhymeBrain
- a chat client
Code
Timestamp.java
package lecture27;
import java.io.IOException;
import java.net.Socket;
import java.util.Scanner;
public class Timestamp {
public static void main(String[] args) throws IOException {
Socket socket = new Socket("time-A.timefreq.bldrdoc.gov", 13);
Scanner in = new Scanner(socket.getInputStream());
while (in.hasNextLine()) {
System.out.println(in.nextLine());
}
in.close();
socket.close();
}
}
WhetherWeather.java
package lecture27;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Date;
import java.util.Scanner;
public class WhetherWeather {
public static void main(String[] args) throws IOException {
URL url = new URL("http://api.openweathermap.org/data/2.5/weather?q=Eau%20Claire,WI");
URLConnection connection = url.openConnection();
connection.connect();
Scanner in = new Scanner(connection.getInputStream());
StringBuilder builder = new StringBuilder();
while (in.hasNextLine()) {
builder.append(in.nextLine());
}
in.close();
System.out.println(builder.toString());
in = new Scanner(builder.toString());
in.useDelimiter("\\D");
in.findInLine("\"sunset\":");
long time = in.nextLong();
in.close();
System.out.println(new Date(time * 1000L));
}
}
Rhymer.java
package lecture27;
import java.awt.BorderLayout;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.BoxLayout;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
public class Rhymer extends JFrame {
private JTextField wordBox;
private JButton getButton;
private JList<String> rhymesList;
private DefaultListModel<String> rhymesListModel;
public Rhymer() {
wordBox = new JTextField();
getButton = new JButton("Find Rhymes");
rhymesListModel = new DefaultListModel<>();
rhymesList = new JList<>(rhymesListModel);
getButton.addActionListener(e -> getRhymes(wordBox.getText()));
// Top panel
JPanel topPanel = new JPanel();
BoxLayout boxLayout = new BoxLayout(topPanel, BoxLayout.X_AXIS);
topPanel.setLayout(boxLayout);
topPanel.add(wordBox);
topPanel.add(getButton);
// Fill the frame
add(topPanel, BorderLayout.NORTH);
add(new JScrollPane(rhymesList), BorderLayout.CENTER);
setSize(512, 512);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
private void getRhymes(String word) {
try {
URL url = new URL("http://rhymebrain.com/talk?function=getRhymes&word=" + word);
URLConnection connection = url.openConnection();
connection.connect();
Scanner in = new Scanner(connection.getInputStream());
StringBuilder builder = new StringBuilder();
while (in.hasNextLine()) {
builder.append(in.nextLine());
}
in.close();
Pattern pattern = Pattern.compile("\"word\"\\s*:\\s*\"(\\w*)\"");
Matcher matcher = pattern.matcher(builder.toString());
rhymesListModel.clear();
while (matcher.find()) {
String rhyme = matcher.group(1);
rhymesListModel.addElement(rhyme);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static void main(String[] args) {
new Rhymer();
}
}
MSYahAIM.java
package lecture27;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Scanner;
public class MSYahAIM {
private static ArrayList<Client> clients = new ArrayList<>();
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = new ServerSocket(8181);
while (true) {
Socket clientSocket = serverSocket.accept();
new Thread(new ClientListener(clientSocket)).start();
}
// socket.close();
}
private static class ClientListener implements Runnable {
private Client client;
public ClientListener(Socket socket) throws IOException {
client = new Client(socket, new PrintWriter(socket.getOutputStream(), true), null);
clients.add(client);
}
@Override
public void run() {
try {
Scanner in = new Scanner(client.socket.getInputStream());
while (in.hasNextLine()) {
String line = in.nextLine();
for (Client client : clients) {
client.out.println(line);
}
}
in.close();
client.out.close();
client.socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private static class Client {
private Socket socket;
private PrintWriter out;
private String name;
public Client(Socket socket, PrintWriter out, String name) {
this.socket = socket;
this.out = out;
this.name = name;
}
}
}
Haiku
My first love chat bombed
She said:
She said:
let's be... close, I saidChris has left the room