Post on 17-Dec-2015
© Amir Kirsh
Java Networking
Written by Amir Kirsh, Edited by Liron Blecher
Age
nda
• Downloading a web page
• TCP Client
• TCP Server
• What’s beyond
3
Downloading a web page
public static void main (String args[]) {
String line;try {
URL u = new URL(args[0]);
DataInputStream htmlPage =new DataInputStream(u.openStream());
while ((line = htmlPage.readLine()) != null) { System.out.println(line);
}}catch (Exception e) {
System.err.println(e); // naive treatment}
}
4
Dealing with URL encoding
public static void main (String args[]) {
String line;try {
URL u = new URL(URLEncoder.encode(
args[0], Charset.forName("UTF-8") ) );
DataInputStream htmlPage =new DataInputStream(u.openStream());
while ((line = htmlPage.readLine()) != null) { System.out.println(line);
}}catch (Exception e) {
System.err.println(e); // naive treatment}
}
Age
nda
• Downloading a web page
• TCP Client
• TCP Server
• What’s beyond
6
Simple TCP Echo Client
String line = "";
try (Socket socket = new Socket("localhost", 7000)) {
BufferedReader inputStream = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintStream outputStream = new PrintStream(socket.getOutputStream());
BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));
while (!line.equals("!")) {
line = userInput.readLine();
outputStream.println(line);
System.out.println(inputStream.readLine());
}
}
7
Simple TCP Echo Client – cont’
public static void main(String[] args) {
try {…
} catch (Exception e) {
System.err.println(e);}
}
Age
nda
• Downloading a web page
• TCP Client
• TCP Server
• What’s beyond
9
Simple TCP Echo Server
String line = "";
try (ServerSocket server = new ServerSocket(7000)) {
Socket socket = server.accept(); // blockingBufferedReader inputStream = new BufferedReader(new
InputStreamReader(socket.getInputStream()));
PrintStream outputStream = new PrintStream(socket.getOutputStream());
while (!line.equals("!")) {
line = inputStream.readLine();
outputStream.println(line);
System.out.println(line);
}
}
10
Simple TCP Echo Server – cont’
public static void main(String[] args) {
try {…
} catch (Exception e) {
System.err.println(e);}
}
DEMO
examples.streams.simple
11
Age
nda
• Downloading a web page
• TCP Client
• TCP Server
• What’s beyond
13
What’s beyond
- UDPjava.net.DatagramSocket
- Multicastjava.net.MulticastSocket
- Selector and Channels (and nio in general)java.nio.channels
- Servlets (and JSP)
- Web Services
- RMI; EJB
DEMO
examples.streams.advanced
14