Init

src/Aufgabe10_ChatProgramm/Client.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+
+package Aufgabe10_ChatProgramm;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.util.logging.*;
+
+/**
+ * Builder Class
+ * @author le
+ */
+public class Client
+{
+  private static Logger lg = Logger.getLogger("netz");
+  private static final int PORT = 35000; //lt. iana port > 2¹⁵
+  private static final String IP = "127.0.0.1";
+  
+  
+  public Client() throws IOException
+  {
+    lg.info("Client: versuche zu verbinden");
+    Socket s = new Socket(IP, PORT); // ACHTUNG blockiert!
+    lg.info("Client: Verbindung akzeptiert");
+    
+    InputStream is = s.getInputStream();
+    OutputStream os = s.getOutputStream();
+    
+    //Umwandlung der Byteströme
+    InputStreamReader isr = new InputStreamReader(is, "UTF-8");
+    OutputStreamWriter osr = new OutputStreamWriter(os, "UTF-8");
+    
+    //Puffer
+    BufferedReader in = new BufferedReader(isr);
+    //BufferedWriter out = new BufferedWriter(osr);
+    //besser
+    PrintWriter out = new PrintWriter(osr);
+    
+    lg.info("Client: Streams erfolgreich initialisiert");
+    lg.info("Client: sende Textnachricht");
+    
+    out.println("Hallo Du Server - ich bin ein Client");
+    out.flush();
+    
+    lg.info("Client: warte auf Serverantwort");
+    
+    String nachricht = in.readLine(); // ACHTUNG blockiert
+    lg.info("Client: Serverbestätigung erhalten");
+    
+    lg.info("Client: fertig");
+    in.close();
+    out.close();
+    s.close();
+  }
+
+  /**
+   * @param args the command line arguments
+   */
+  public static void main(String[] args) 
+  {
+    try
+    {
+      new Client();
+    }
+    catch (IOException ex)
+    {
+      Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex);
+    }
+  }
+}

src/Aufgabe10_ChatProgramm/Server.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+
+package Aufgabe10_ChatProgramm;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.logging.*;
+
+/**
+ * Builder Class
+ * @author le
+ */
+public class Server
+{
+  private static Logger lg = Logger.getLogger("netz");
+  private static final int PORT = 35000; //lt. iana port > 2¹⁵
+  
+  
+  public Server() throws IOException
+  {
+    ServerSocket sSocket = new ServerSocket(PORT);
+    lg.info("Server: warte auf Verbindung");
+    Socket s = sSocket.accept(); // ACHTUNG blockiert!
+    
+    lg.info("Server: Verbindung akzeptiert");
+    
+    InputStream is = s.getInputStream();
+    OutputStream os = s.getOutputStream();
+    
+    //Umwandlung der Byteströme
+    InputStreamReader isr = new InputStreamReader(is, "UTF-8");
+    OutputStreamWriter osr = new OutputStreamWriter(os, "UTF-8");
+    
+    //Puffer
+    BufferedReader in = new BufferedReader(isr);
+    //BufferedWriter out = new BufferedWriter(osr);
+    //besser
+    PrintWriter out = new PrintWriter(osr);
+    
+    lg.info("Server: Streams erfolgreich initialisiert");
+    lg.info("Server: warte auf Textnachricht");
+    
+    String nachricht = in.readLine(); // ACHTUNG blockiert
+    lg.info("Server: Nachricht erhalten");
+    System.out.println("Server: NACHRICHT = " + nachricht);
+    
+    // ACHTUNG: blockiert NICHT!!!!
+    out.println("Server an Client: Nachricht erhalten");
+    out.flush(); // wichtig
+    
+    lg.info("Server: fertig");
+    in.close();
+    out.close();
+    s.close();
+  }
+
+  /**
+   * @param args the command line arguments
+   */
+  public static void main(String[] args) 
+  {
+    try
+    {
+      new Server();
+    }
+    catch (IOException ex)
+    {
+      Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
+    }
+  }
+}

src/Aufgabe10_ChatProgramm/Start.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+
+package Aufgabe10_ChatProgramm;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+/**
+ * Builder Class
+ * @author le
+ */
+public class Start
+{
+  public Start(String host, String dateiname) throws MalformedURLException, IOException
+  {
+    URL oURL = new URL(host + "/" + dateiname);
+    InputStream inS = oURL.openStream();
+    BufferedInputStream in = new BufferedInputStream(inS);
+    
+    String tmpVerzeichnis = System.getProperty("java.io.tmpdir");
+    String ausgabeDatei = tmpVerzeichnis + File.separator + dateiname;
+    
+    FileOutputStream fos = new FileOutputStream(ausgabeDatei);
+    BufferedOutputStream out = new BufferedOutputStream(fos);
+    
+    int wert = 0;
+    
+    while ( (wert = in.read()) >= 0)
+    {
+      out.write(wert);
+    }
+    out.flush();
+    out.close();
+    in.close();
+    System.out.println("Datei " + dateiname +
+                       " im Verzeichnis " + tmpVerzeichnis + 
+                       " gespeichert");
+  }
+
+  /**
+   * @param args the command line arguments
+   */
+  public static void main(String[] args) 
+  {
+    if (args.length != 2)
+    {
+      System.err.println("2 Aufrufparameter nötig: Host und Dateiname");
+    }
+    else
+    {
+      try
+      {
+        new Start(args[0], args[1]);
+      }
+      catch (Exception ex)
+      {
+        System.err.println(ex);
+      }
+    }
+  }
+}