Init

build.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- You may freely edit this file. See commented blocks below for -->
+<!-- some examples of how to customize the build. -->
+<!-- (If you delete it and reopen the project it will be recreated.) -->
+<!-- By default, only the Clean and Build commands use this build script. -->
+<!-- Commands such as Run, Debug, and Test only use this build script if -->
+<!-- the Compile on Save feature is turned off for the project. -->
+<!-- You can turn off the Compile on Save (or Deploy on Save) setting -->
+<!-- in the project's Project Properties dialog box.-->
+<project name="Aufgabe10_ChatProgramm" default="default" basedir=".">
+    <description>Builds, tests, and runs the project Aufgabe10_ChatProgramm.</description>
+    <import file="nbproject/build-impl.xml"/>
+    <!--
+
+    There exist several targets which are by default empty and which can be 
+    used for execution of your tasks. These targets are usually executed 
+    before and after some main targets. They are: 
+
+      -pre-init:                 called before initialization of project properties
+      -post-init:                called after initialization of project properties
+      -pre-compile:              called before javac compilation
+      -post-compile:             called after javac compilation
+      -pre-compile-single:       called before javac compilation of single file
+      -post-compile-single:      called after javac compilation of single file
+      -pre-compile-test:         called before javac compilation of JUnit tests
+      -post-compile-test:        called after javac compilation of JUnit tests
+      -pre-compile-test-single:  called before javac compilation of single JUnit test
+      -post-compile-test-single: called after javac compilation of single JUunit test
+      -pre-jar:                  called before JAR building
+      -post-jar:                 called after JAR building
+      -post-clean:               called after cleaning build products
+
+    (Targets beginning with '-' are not intended to be called on their own.)
+
+    Example of inserting an obfuscator after compilation could look like this:
+
+        <target name="-post-compile">
+            <obfuscate>
+                <fileset dir="${build.classes.dir}"/>
+            </obfuscate>
+        </target>
+
+    For list of available properties check the imported 
+    nbproject/build-impl.xml file. 
+
+
+    Another way to customize the build is by overriding existing main targets.
+    The targets of interest are: 
+
+      -init-macrodef-javac:     defines macro for javac compilation
+      -init-macrodef-junit:     defines macro for junit execution
+      -init-macrodef-debug:     defines macro for class debugging
+      -init-macrodef-java:      defines macro for class execution
+      -do-jar:                  JAR building
+      run:                      execution of project 
+      -javadoc-build:           Javadoc generation
+      test-report:              JUnit report generation
+
+    An example of overriding the target for project execution could look like this:
+
+        <target name="run" depends="Aufgabe10_ChatProgramm-impl.jar">
+            <exec dir="bin" executable="launcher.exe">
+                <arg file="${dist.jar}"/>
+            </exec>
+        </target>
+
+    Notice that the overridden target depends on the jar target and not only on 
+    the compile target as the regular run target does. Again, for a list of available 
+    properties which you can use, check the target you are overriding in the
+    nbproject/build-impl.xml file. 
+
+    -->
+</project>

manifest.mf

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+Manifest-Version: 1.0
+X-COMMENT: Main-Class will be added automatically by build
+

nbproject/genfiles.properties

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+build.xml.data.CRC32=d0232020
+build.xml.script.CRC32=a0f7eb51
+build.xml.stylesheet.CRC32=f85dc8f2@1.108.0.48
+# This file is used by a NetBeans-based IDE to track changes in generated files such as build-impl.xml.
+# Do not edit this file. You may delete it but then the IDE will never regenerate such files for you.
+nbproject/build-impl.xml.data.CRC32=d0232020
+nbproject/build-impl.xml.script.CRC32=e7873e67
+nbproject/build-impl.xml.stylesheet.CRC32=12e0a6c2@1.108.0.48

nbproject/project.properties

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+annotation.processing.enabled=true
+annotation.processing.enabled.in.editor=false
+annotation.processing.processors.list=
+annotation.processing.run.all.processors=true
+annotation.processing.source.output=${build.generated.sources.dir}/ap-source-output
+application.title=Aufgabe10_ChatProgramm
+application.vendor=le
+build.classes.dir=${build.dir}/classes
+build.classes.excludes=**/*.java,**/*.form
+# This directory is removed when the project is cleaned:
+build.dir=build
+build.generated.dir=${build.dir}/generated
+build.generated.sources.dir=${build.dir}/generated-sources
+# Only compile against the classpath explicitly listed here:
+build.sysclasspath=ignore
+build.test.classes.dir=${build.dir}/test/classes
+build.test.results.dir=${build.dir}/test/results
+# Uncomment to specify the preferred debugger connection transport:
+#debug.transport=dt_socket
+debug.classpath=\
+    ${run.classpath}
+debug.modulepath=\
+    ${run.modulepath}
+debug.test.classpath=\
+    ${run.test.classpath}
+debug.test.modulepath=\
+    ${run.test.modulepath}
+# Files in build.classes.dir which should be excluded from distribution jar
+dist.archive.excludes=
+# This directory is removed when the project is cleaned:
+dist.dir=dist
+dist.jar=${dist.dir}/Aufgabe10_ChatProgramm.jar
+dist.javadoc.dir=${dist.dir}/javadoc
+dist.jlink.dir=${dist.dir}/jlink
+dist.jlink.output=${dist.jlink.dir}/Aufgabe10_ChatProgramm
+endorsed.classpath=
+excludes=
+includes=**
+jar.compress=false
+javac.classpath=
+# Space-separated list of extra javac options
+javac.compilerargs=
+javac.deprecation=false
+javac.external.vm=true
+javac.modulepath=
+javac.processormodulepath=
+javac.processorpath=\
+    ${javac.classpath}
+javac.source=17
+javac.target=17
+javac.test.classpath=\
+    ${javac.classpath}:\
+    ${build.classes.dir}
+javac.test.modulepath=\
+    ${javac.modulepath}
+javac.test.processorpath=\
+    ${javac.test.classpath}
+javadoc.additionalparam=
+javadoc.author=false
+javadoc.encoding=${source.encoding}
+javadoc.html5=false
+javadoc.noindex=false
+javadoc.nonavbar=false
+javadoc.notree=false
+javadoc.private=false
+javadoc.splitindex=true
+javadoc.use=true
+javadoc.version=false
+javadoc.windowtitle=
+# The jlink additional root modules to resolve
+jlink.additionalmodules=
+# The jlink additional command line parameters
+jlink.additionalparam=
+jlink.launcher=true
+jlink.launcher.name=Aufgabe10_ChatProgramm
+main.class=Aufgabe10_ChatProgramm.Start
+manifest.file=manifest.mf
+meta.inf.dir=${src.dir}/META-INF
+mkdist.disabled=false
+platform.active=default_platform
+run.classpath=\
+    ${javac.classpath}:\
+    ${build.classes.dir}
+# Space-separated list of JVM arguments used when running the project.
+# You may also define separate properties like run-sys-prop.name=value instead of -Dname=value.
+# To set system properties for unit tests define test-sys-prop.name=value:
+run.jvmargs=
+run.modulepath=\
+    ${javac.modulepath}
+run.test.classpath=\
+    ${javac.test.classpath}:\
+    ${build.test.classes.dir}
+run.test.modulepath=\
+    ${javac.test.modulepath}
+source.encoding=UTF-8
+src.dir=src
+test.src.dir=test

nbproject/project.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://www.netbeans.org/ns/project/1">
+    <type>org.netbeans.modules.java.j2seproject</type>
+    <configuration>
+        <data xmlns="http://www.netbeans.org/ns/j2se-project/3">
+            <name>Aufgabe10_ChatProgramm</name>
+            <source-roots>
+                <root id="src.dir"/>
+            </source-roots>
+            <test-roots>
+                <root id="test.src.dir"/>
+            </test-roots>
+        </data>
+    </configuration>
+</project>

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);
+      }
+    }
+  }
+}