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ikergcalvinoikergcalvino
committedFeb 6, 2020
java-labs initial commit
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‎.gitignore

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# Target directories.
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target/
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# Eclipse configuration.
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.classpath
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.project
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.settings/
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# IntelliJ IDEA configuration.
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.idea/
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# Netbeans configuration.
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/nbproject/private/
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/dist/
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/build/

‎README.md

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# java-labs: Creating the environment for Java development and Git - 2019-2020
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## Netcat (nc)
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- Windows OS
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- Download MobaXterm from [here] (https://download.mobatek.net/1242019111120613/MobaXterm_Portable_v12.4.zip) and extract the content. No installation is needed. Netcat is available if you click on "Start local terminal".
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- Linux OS
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- Netcat should already be installed on your system.
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## NetBeans IDE 8.2 for Java SE
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- Download NetBeans from [here](https://netbeans.org/downloads/8.2/) and install it using default options.
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## Git
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- Download Git from [here](https://git-scm.com/downloads) and install it using default options
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> Note that for instance in Ubuntu systems you could download and install it by simply executing the following:
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```shell
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sudo apt-get install git
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```
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- Basic configuration
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- In Windows OS, the following commands should be executed inside git-bash (`$GIT_HOME/git-bash.exe`):
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```shell
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git config --global user.email "<user-login>@udc.es"
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git config --global user.name "<user-name>"
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```
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> The following line illustrates how to set Sublime as the Git default editor, but you can use any other editor installed in your OS (you can download Sublime Text editor from [here](https://www.sublimetext.com/3))
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```shell
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>Windows OS
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git config --global core.editor "'C:\Program Files\Sublime Text 3\sublime_text.exe' -w"
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>Linux OS
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git config --global core.editor "subl -w"
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```
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- [Optional] Autocompletion utility for Git in Linux OS systems:
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- Follow instructions from [https://github.com/bobthecow/git-flow-completion/wiki/Install-Bash-git-completion](https://github.com/bobthecow/git-flow-completion/wiki/Install-Bash-git-completion)
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### Creation and configuration of SSH Keys
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- From the git-bash interpreter in Windows OS systems
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> Generate SSH keys in the default path ($HOME/.ssh) and with default names
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```shell
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ssh-keygen -t rsa -b 4096 -C "<user-login>@udc.es"
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```
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- Open the browser and navigate to [https://git.fic.udc.es/profile/keys](https://git.fic.udc.es/profile/keys)
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- In the "Key" field, copy the public key, i.e, content of file `$HOME/.ssh/id_rsa.pub`
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- In the "Title" field, specify a name for the key
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- Click on the "Add key" button
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- Try SSH connectivity against the Git server and add it to the list of known hosts
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> Answer "yes" to the question "Are you sure you want to continue connecting (yes/no)?"
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```shell
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ssh -T git@git.fic.udc.es
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```
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## Creating your project
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### Create Git repository in FIC GitLab web site
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- Open the browser and navigate to https://git.fic.udc.es/users/&lt;user-login&gt;/projects, where &lt;user-login&gt; is your user login.
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- Click on "+" (on the right of the search box, on the top of the we page)
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- Click on "New project".
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- Specify "java-labs" as the name of the project.
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- Type of project must remain to "Private" (default value).
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- <code><b>Click on the "Members" link.</b></code>
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- Click on the "Add member" tab, and select "telematica.redes" as the member to invite.
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- Choose "Master" as the role permission.
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- Do not fill the expiration date field.
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- Click on "Add to project" button.
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### Initializing your Git repository
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- Download project template from [moodle](https://moodle.udc.es/course/view.php?id=55380) (`java-labs.zip` file)
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```shell
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unzip java-labs.zip
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cd java-labs
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git init
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git remote add origin git@git.fic.udc.es:<user-login>/java-labs.git
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git add .
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git commit -m "java-labs initial commit"
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git push -u origin master
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```
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NOTE that &lt;user-login&gt; must be changed by your user login.
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### Load the project in NetBeans
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- Click on "File" > "New Project" menu option.
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- Choose "Java Category" and "Java Project with Existent Sources" project type.
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- Click on "Next" button.
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- Set "java-labs" as "Project Name".
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- Choose folder "java-labs" as "Project Folder".
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- Click on "Next" button.
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- Click on "Add Folder ..." to add the "src" folder to the "Source Package Folders" of the project.
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- Click on "Finish" button.
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### [Optional] Install a graphical client for Git
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- Recommended option could be "GitKraken". You can download it from [here](https://www.gitkraken.com/download)

‎src/es/udc/redes/tutorial/copy/Copy.java

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package es.udc.redes.tutorial.copy;
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public class Copy {
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public static void main(String[] args) {
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}
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}

‎src/es/udc/redes/tutorial/tcp/client/TcpClient.java

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package es.udc.redes.tutorial.tcp.client;
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import java.net.*;
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import java.io.*;
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/**
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* Implements an echo client using TCP
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*/
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public class TcpClient {
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public static void main(String argv[]) {
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if (argv.length != 3) {
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System.err.println("Format: es.udc.redes.tutorial.tcp.client.TcpClient <server_address> <port_number> <message>");
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System.exit(-1);
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}
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Socket socket = null;
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try {
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// Obtains the server IP address
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InetAddress serverAddress = InetAddress.getByName(argv[0]);
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// Obtains the server port
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int serverPort = Integer.parseInt(argv[1]);
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// Obtains the message
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String message = argv[2];
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// Creates the socket and establishes connection with the server
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socket = new Socket(serverAddress, serverPort);
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// Set a max. Timeout of 300 secs
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socket.setSoTimeout(300000);
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System.out.println("CLIENT: Connection established with "
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+ serverAddress.toString() + " port " + serverPort);
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// Set the input channel
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BufferedReader sInput = new BufferedReader(new InputStreamReader(
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socket.getInputStream()));
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// Set the output channel
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PrintWriter sOutput = new PrintWriter(socket.getOutputStream(), true);
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System.out.println("CLIENT: Sending " + message);
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// Send message to the server
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sOutput.println(message);
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// Receive server response
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String recibido = sInput.readLine();
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System.out.println("CLIENT: Received " + recibido);
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// Close streams and release connection
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sOutput.close();
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sInput.close();
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} catch (SocketTimeoutException e) {
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System.err.println("Nothing received in 300 secs");
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} catch (Exception e) {
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System.err.println("Error: " + e.getMessage());
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} finally {
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try {
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socket.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}

‎src/es/udc/redes/tutorial/tcp/server/TcpServer.java

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package es.udc.redes.tutorial.tcp.server;
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import java.net.*;
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import java.io.*;
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/**
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* Monothread TCP echo server.
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*/
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public class TcpServer {
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public static void main(String argv[]) {
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if (argv.length != 1) {
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System.err.println("Format: es.udc.redes.tutorial.tcp.server.TcpServer <port>");
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System.exit(-1);
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}
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try {
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// Create a server socket
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// Set a timeout of 300 secs
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while (true) {
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// Wait for connections
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// Set the input channel
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// Set the output channel
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// Receive the client message
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// Send response to the client
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// Close the streams
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}
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// Uncomment next catch clause after implementing the logic
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//} catch (SocketTimeoutException e) {
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// System.err.println("Nothing received in 300 secs ");
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} catch (Exception e) {
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System.err.println("Error: " + e.getMessage());
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e.printStackTrace();
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} finally {
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//Close the socket
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}
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}
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}

‎src/es/udc/redes/tutorial/udp/client/UdpClient.java

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package es.udc.redes.tutorial.udp.client;
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import java.net.*;
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/**
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* This example implements a Echo client using UDP
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*/
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public class UdpClient {
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public static void main(String argv[]) {
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if (argv.length != 3) {
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System.err.println("Format: es.udc.redes.tutorial.udp.client.UdpClient <server_address> <port_number> <message>");
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System.exit(-1);
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}
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DatagramSocket sDatagram = null;
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try {
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// Create a non connection-oriented socket
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// (use any available port)
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sDatagram = new DatagramSocket();
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// Set timeout to 300 secs
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sDatagram.setSoTimeout(300000);
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// Obtain server IP address from first argument
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InetAddress serverAddress = InetAddress.getByName(argv[0]);
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// Obtain server port from second argument
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int serverPort = Integer.parseInt(argv[1]);
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// Obtain message from third argument
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String message = argv[2];
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// Prepare the datagram
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DatagramPacket dgramSent = new DatagramPacket(message.getBytes(),
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message.getBytes().length, serverAddress, serverPort);
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// Send the datagram
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sDatagram.send(dgramSent);
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System.out.println("CLIENT: Sending "
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+ new String(dgramSent.getData()) + " to "
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+ dgramSent.getAddress().toString() + ":"
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+ dgramSent.getPort());
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// Prepare datagram for data reception
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byte array[] = new byte[1024];
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DatagramPacket dgramRec = new DatagramPacket(array, array.length);
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// Receive the message
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sDatagram.receive(dgramRec);
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System.out.println("CLIENT: Received "
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+ new String(dgramRec.getData(), 0, dgramRec.getLength())
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+ " from " + dgramRec.getAddress().toString() + ":"
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+ dgramRec.getPort());
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} catch (SocketTimeoutException e) {
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System.err.println("Nothing received in 300 secs");
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} catch (Exception e) {
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System.err.println("Error: " + e.getMessage());
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} finally {
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// Close socket to release connection
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sDatagram.close();
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}
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}
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}

‎src/es/udc/redes/tutorial/udp/server/UdpServer.java

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package es.udc.redes.tutorial.udp.server;
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import java.net.*;
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/**
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* Implements an UDP Echo Server.
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*/
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public class UdpServer {
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public static void main(String argv[]) {
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if (argv.length != 1) {
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System.err.println("Format: es.udc.redes.tutorial.udp.server.UdpServer <port_number>");
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System.exit(-1);
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}
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try {
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// Create a server socket
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// Set max. timeout to 300 secs
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while (true) {
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// Prepare datagram for reception
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// Receive the message
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// Prepare datagram to send response
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// Send response
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}
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// Uncomment next catch clause after implementing the logic
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//} catch (SocketTimeoutException e) {
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// System.err.println("No requests received in 300 secs ");
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} catch (Exception e) {
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System.err.println("Error: " + e.getMessage());
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e.printStackTrace();
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} finally {
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// Close the socket
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}
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}
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}

‎src/es/udc/redes/webserver/WebServer.java

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package es.udc.redes.webserver;
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public class WebServer {
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public static void main(String[] args) {
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}
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}

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