Pourquoi une erreur se produit-elle lorsque j'essaie d'exécuter mon programme de socket en Java?

Question

J'utilise jcreatorLE et JDK 1.6 pour exécuter mon programme. Je ne sais pas pourquoi j'ai une erreur quand j'essaie de courir. Quelqu'un pourrait-il m'expliquer la raison?

C'est le code pour le serveur:

import java.io.*; 
import java.net.*; 

class ServidorTCP { 
    // variable to wait for connections 
    private static ServerSocket servidor = null; 
    // Variable to process client connections 
    private static Socket conexion = null; 
    // To send data to the client 
    private static DataOutputStream salida = null; 
    // Read the client 
    private static DataInputStream entrada = null; 

    public static void main(String args[]) { 
     // args [0] is the port number to be listened to 
     int puerto = new Integer(args[0]).intValue(); 

     // opening of the socket 
     try { 
     // Port where the client requests pending 
     servidor = new ServerSocket(puerto); 

     System.out.println("Servidor TCP iniciado..."); 
     boolean ejecutar = true; 

     // It is starting to respond to requests 
     while (ejecutar) { 
      System.out.println("\nWaiting for Connections..."); 
      conexion = servidor.accept();  // Connection is expected 

      // The connection was established with the client 
      entrada = new DataInputStream(conexion.getInputStream()); 
      salida = new DataOutputStream(conexion.getOutputStream()); 

      System.out.println("\nConexion recibida...\n"); 
      String inicio = entrada.readUTF(); 
      System.out.println("Reception Date: "+new java.util.Date()); 
      System.out.println("From: "+(conexion.getInetAddress()).toString()); 
      System.out.println("received: "+inicio); 

      salida.writeUTF(inicio.toUpperCase()); 
      entrada.close(); 
      salida.close(); 
      conexion.close(); 
     } 

     // Close the socket 
     System.out.println("\ntransmission completed...\n"); 
     servidor.close(); 
     } catch (Exception e) { 
     e.printStackTrace(); 
     } 
    } 
} 

Voici le code du programme socket client:

import java.io.*; 
import java.net.*; 

class ClienteTCP { 
    private static Socket   cliente = null; 
    private static DataInputStream entrada = null; 
    private static DataOutputStream salida = null; 

    public static void main(String args[]) { 
     int len = new Integer(args.length); 
     String cadena = ""; 
     System.out.println("\nNumero de arg: "+len); 
     for (int i=2; i<len;i++) { 
     cadena = cadena + args[i]; 
     cadena = cadena + " "; 
     } 

     System.out.println("\nLa Cadena: "+cadena); 
     int puerto = new Integer(args[1]).intValue(); 

     try { 
     cliente = new Socket(args[0],puerto); 
     entrada = new DataInputStream(cliente.getInputStream()); 
     salida = new DataOutputStream(cliente.getOutputStream()); 

     //SENDING INFORMATION DATA 
     System.out.println("\nEnviando datos al servidor: "+cadena); 
     salida.writeUTF(cadena); 

     //Recibiendo la información 
     System.out.println("Recibido: "+entrada.readUTF()); 
     entrada.close(); 
     salida.close(); 

     //Cierre del socket 
     cliente.close(); 
     System.out.println("\nConexion terminada...\n"); 
     } catch (Exception e) { 
     e.printStackTrace(); 
     } 
    } 
} 

Ceci est le résultat de l'exécuter:

[Loaded java.lang.Object from shared objects file] 
[Loaded java.io.Serializable from shared objects file] 
[Loaded java.lang.Comparable from shared objects file] 
[Loaded java.lang.CharSequence from shared objects file] 
[Loaded java.lang.String from shared objects file] 
[Loaded java.lang.reflect.GenericDeclaration from shared objects file] 
[Loaded java.lang.reflect.Type from shared objects file] 
[Loaded java.lang.reflect.AnnotatedElement from shared objects file] 
[Loaded java.lang.Class from shared objects file] 
[Loaded java.lang.Cloneable from shared objects file] 
[Loaded java.lang.ClassLoader from shared objects file] 
[Loaded java.lang.System from shared objects file] 
[Loaded java.lang.Throwable from shared objects file] 
[Loaded java.lang.Error from shared objects file] 
[Loaded java.lang.ThreadDeath from shared objects file] 
[Loaded java.lang.Exception from shared objects file] 
[Loaded java.lang.RuntimeException from shared objects file] 
[Loaded java.security.ProtectionDomain from shared objects file] 
[Loaded java.security.AccessControlContext from shared objects file] 
[Loaded java.lang.ClassNotFoundException from shared objects file] 
[Loaded java.lang.LinkageError from shared objects file] 
[Loaded java.lang.NoClassDefFoundError from shared objects file] 
[Loaded java.lang.ClassCastException from shared objects file] 
[Loaded java.lang.ArrayStoreException from shared objects file] 
[Loaded java.lang.VirtualMachineError from shared objects file] 
[Loaded java.lang.OutOfMemoryError from shared objects file] 
[Loaded java.lang.StackOverflowError from shared objects file] 
[Loaded java.lang.IllegalMonitorStateException from shared objects file] 
[Loaded java.lang.ref.Reference from shared objects file] 
[Loaded java.lang.ref.SoftReference from shared objects file] 
[Loaded java.lang.ref.WeakReference from shared objects file] 
[Loaded java.lang.ref.FinalReference from shared objects file] 
[Loaded java.lang.ref.PhantomReference from shared objects file] 
[Loaded java.lang.ref.Finalizer from shared objects file] 
[Loaded java.lang.Runnable from shared objects file] 
[Loaded java.lang.Thread from shared objects file] 
[Loaded java.lang.Thread$UncaughtExceptionHandler from shared objects file] 
[Loaded java.lang.ThreadGroup from shared objects file] 
[Loaded java.util.Dictionary from shared objects file] 
[Loaded java.util.Map from shared objects file] 
[Loaded java.util.Hashtable from shared objects file] 
[Loaded java.util.Properties from shared objects file] 
[Loaded java.lang.reflect.AccessibleObject from shared objects file] 
[Loaded java.lang.reflect.Member from shared objects file] 
[Loaded java.lang.reflect.Field from shared objects file] 
[Loaded java.lang.reflect.Method from shared objects file] 
[Loaded java.lang.reflect.Constructor from shared objects file] 
[Loaded sun.reflect.MagicAccessorImpl from shared objects file] 
[Loaded sun.reflect.MethodAccessor from shared objects file] 
[Loaded sun.reflect.MethodAccessorImpl from shared objects file] 
[Loaded sun.reflect.ConstructorAccessor from shared objects file] 
[Loaded sun.reflect.ConstructorAccessorImpl from shared objects file] 
[Loaded sun.reflect.DelegatingClassLoader from shared objects file] 
[Loaded sun.reflect.ConstantPool from shared objects file] 
[Loaded sun.reflect.FieldAccessor from shared objects file] 
[Loaded sun.reflect.FieldAccessorImpl from shared objects file] 
[Loaded sun.reflect.UnsafeFieldAccessorImpl from shared objects file] 
[Loaded sun.reflect.UnsafeStaticFieldAccessorImpl from shared objects file] 
[Loaded java.lang.Iterable from shared objects file] 
[Loaded java.util.Collection from shared objects file] 
[Loaded java.util.AbstractCollection from shared objects file] 
[Loaded java.util.List from shared objects file] 
[Loaded java.util.AbstractList from shared objects file] 
[Loaded java.util.RandomAccess from shared objects file] 
[Loaded java.util.Vector from shared objects file] 
[Loaded java.lang.Appendable from shared objects file] 
[Loaded java.lang.AbstractStringBuilder from shared objects file] 
[Loaded java.lang.StringBuffer from shared objects file] 
[Loaded java.lang.StackTraceElement from shared objects file] 
[Loaded java.nio.Buffer from shared objects file] 
[Loaded sun.misc.AtomicLong from shared objects file] 
[Loaded sun.misc.AtomicLongCSImpl from shared objects file] 
[Loaded java.lang.Boolean from shared objects file] 
[Loaded java.lang.Character from shared objects file] 
[Loaded java.lang.Number from shared objects file] 
[Loaded java.lang.Float from shared objects file] 
[Loaded java.lang.Double from shared objects file] 
[Loaded java.lang.Byte from shared objects file] 
[Loaded java.lang.Short from shared objects file] 
[Loaded java.lang.Integer from shared objects file] 
[Loaded java.lang.Long from shared objects file] 
[Loaded java.io.ObjectStreamField from shared objects file] 
[Loaded java.util.Comparator from shared objects file] 
[Loaded java.lang.String$CaseInsensitiveComparator from shared objects file] 
[Loaded java.security.Guard from shared objects file] 
[Loaded java.security.Permission from shared objects file] 
[Loaded java.security.BasicPermission from shared objects file] 
[Loaded java.lang.RuntimePermission from shared objects file] 
[Loaded java.util.AbstractMap from shared objects file] 
[Loaded sun.misc.SoftCache from shared objects file] 
[Loaded java.lang.ref.ReferenceQueue from shared objects file] 
[Loaded java.lang.ref.ReferenceQueue$Null from shared objects file] 
[Loaded java.lang.ref.ReferenceQueue$Lock from shared objects file] 
[Loaded java.util.HashMap from shared objects file] 
[Loaded java.lang.annotation.Annotation from shared objects file] 
[Loaded java.util.Map$Entry from shared objects file] 
[Loaded java.util.HashMap$Entry from shared objects file] 
[Loaded java.security.AccessController from shared objects file] 
[Loaded java.lang.reflect.ReflectPermission from shared objects file] 
[Loaded java.security.PrivilegedAction from shared objects file] 
[Loaded sun.reflect.ReflectionFactory$GetReflectionFactoryAction from shared objects file] 
[Loaded java.util.Stack from shared objects file] 
[Loaded sun.reflect.ReflectionFactory from shared objects file] 
[Loaded java.lang.ref.Reference$Lock from shared objects file] 
[Loaded java.lang.ref.Reference$ReferenceHandler from shared objects file] 
[Loaded java.lang.ref.Finalizer$FinalizerThread from shared objects file] 
[Loaded java.util.Enumeration from shared objects file] 
[Loaded java.util.Hashtable$EmptyEnumerator from shared objects file] 
[Loaded java.util.Iterator from shared objects file] 
[Loaded java.util.Hashtable$EmptyIterator from shared objects file] 
[Loaded java.util.Hashtable$Entry from shared objects file] 
[Loaded sun.misc.Version from shared objects file] 
[Loaded java.lang.Runtime from shared objects file] 
[Loaded sun.reflect.Reflection from shared objects file] 
[Loaded java.util.Collections from shared objects file] 
[Loaded java.util.Set from shared objects file] 
[Loaded java.util.AbstractSet from shared objects file] 
[Loaded java.util.Collections$EmptySet from shared objects file] 
[Loaded java.util.Collections$EmptyList from shared objects file] 
[Loaded java.util.Collections$EmptyMap from shared objects file] 
[Loaded java.util.Collections$ReverseComparator from shared objects file] 
[Loaded java.util.Collections$SynchronizedMap from shared objects file] 
[Loaded java.io.File from shared objects file] 
[Loaded java.io.FileSystem from shared objects file] 
[Loaded java.io.Win32FileSystem from shared objects file] 
[Loaded java.io.WinNTFileSystem from shared objects file] 
[Loaded java.io.ExpiringCache from shared objects file] 
[Loaded java.util.LinkedHashMap from shared objects file] 
[Loaded java.io.ExpiringCache$1 from shared objects file] 
[Loaded java.util.LinkedHashMap$Entry from shared objects file] 
[Loaded sun.security.action.GetPropertyAction from shared objects file] 
[Loaded java.lang.StringBuilder from shared objects file] 
[Loaded java.util.Arrays from shared objects file] 
[Loaded java.lang.Math from shared objects file] 
[Loaded sun.misc.JavaIODeleteOnExitAccess from shared objects file] 
[Loaded java.io.File$1 from shared objects file] 
[Loaded sun.misc.SharedSecrets from shared objects file] 
[Loaded sun.misc.Unsafe from shared objects file] 
[Loaded java.lang.IncompatibleClassChangeError from shared objects file] 
[Loaded java.lang.NoSuchMethodError from shared objects file] 
[Loaded sun.jkernel.DownloadManager from shared objects file] 
[Loaded java.lang.ThreadLocal from shared objects file] 
[Loaded sun.jkernel.DownloadManager$1 from shared objects file] 
[Loaded java.util.concurrent.atomic.AtomicInteger from shared objects file] 
[Loaded java.lang.Class$3 from shared objects file] 
[Loaded java.lang.reflect.Modifier from shared objects file] 
[Loaded sun.reflect.LangReflectAccess from shared objects file] 
[Loaded java.lang.reflect.ReflectAccess from shared objects file] 
[Loaded sun.jkernel.DownloadManager$2 from shared objects file] 
[Loaded java.lang.ClassLoader$3 from shared objects file] 
[Loaded java.io.ExpiringCache$Entry from shared objects file] 
[Loaded java.lang.ClassLoader$NativeLibrary from shared objects file] 
[Loaded java.io.Closeable from shared objects file] 
[Loaded java.io.InputStream from shared objects file] 
[Loaded java.io.FileInputStream from shared objects file] 
[Loaded java.io.FileDescriptor from shared objects file] 
[Loaded java.io.Flushable from shared objects file] 
[Loaded java.io.OutputStream from shared objects file] 
[Loaded java.io.FileOutputStream from shared objects file] 
[Loaded java.io.FilterInputStream from shared objects file] 
[Loaded java.io.BufferedInputStream from shared objects file] 
[Loaded java.util.concurrent.atomic.AtomicReferenceFieldUpdater from shared objects file] 
[Loaded java.util.concurrent.atomic.AtomicReferenceFieldUpdater$AtomicReferenceFieldUpdaterImpl from shared objects file] 
[Loaded sun.reflect.misc.ReflectUtil from shared objects file] 
[Loaded java.io.FilterOutputStream from shared objects file] 
[Loaded java.io.PrintStream from shared objects file] 
[Loaded java.io.BufferedOutputStream from shared objects file] 
[Loaded java.io.Writer from shared objects file] 
[Loaded java.io.OutputStreamWriter from shared objects file] 
[Loaded sun.nio.cs.StreamEncoder from shared objects file] 
[Loaded java.nio.charset.Charset from shared objects file] 
[Loaded java.nio.charset.spi.CharsetProvider from shared objects file] 
[Loaded sun.nio.cs.FastCharsetProvider from shared objects file] 
[Loaded sun.nio.cs.StandardCharsets from shared objects file] 
[Loaded sun.util.PreHashedMap from shared objects file] 
[Loaded sun.nio.cs.StandardCharsets$Aliases from shared objects file] 
[Loaded sun.nio.cs.StandardCharsets$Classes from shared objects file] 
[Loaded sun.nio.cs.StandardCharsets$Cache from shared objects file] 
[Loaded sun.nio.cs.HistoricallyNamedCharset from shared objects file] 
[Loaded sun.nio.cs.MS1252 from shared objects file] 
[Loaded java.lang.Class$1 from shared objects file] 
[Loaded sun.reflect.ReflectionFactory$1 from shared objects file] 
[Loaded sun.reflect.NativeConstructorAccessorImpl from shared objects file] 
[Loaded sun.reflect.DelegatingConstructorAccessorImpl from shared objects file] 
[Loaded sun.misc.VM from shared objects file] 
[Loaded java.nio.charset.CharsetEncoder from shared objects file] 
[Loaded sun.nio.cs.SingleByteEncoder from shared objects file] 
[Loaded sun.nio.cs.MS1252$Encoder from shared objects file] 
[Loaded java.nio.charset.CodingErrorAction from shared objects file] 
[Loaded java.nio.charset.CharsetDecoder from shared objects file] 
[Loaded sun.nio.cs.SingleByteDecoder from shared objects file] 
[Loaded sun.nio.cs.MS1252$Decoder from shared objects file] 
[Loaded java.nio.ByteBuffer from shared objects file] 
[Loaded java.nio.HeapByteBuffer from shared objects file] 
[Loaded java.nio.Bits from shared objects file] 
[Loaded java.nio.ByteOrder from shared objects file] 
[Loaded java.lang.Readable from shared objects file] 
[Loaded java.nio.CharBuffer from shared objects file] 
[Loaded java.nio.HeapCharBuffer from shared objects file] 
[Loaded java.nio.charset.CoderResult from shared objects file] 
[Loaded java.nio.charset.CoderResult$Cache from shared objects file] 
[Loaded java.nio.charset.CoderResult$1 from shared objects file] 
[Loaded java.nio.charset.CoderResult$2 from shared objects file] 
[Loaded sun.nio.cs.Surrogate$Parser from shared objects file] 
[Loaded sun.nio.cs.Surrogate from shared objects file] 
[Loaded java.io.BufferedWriter from shared objects file] 
[Loaded java.lang.Terminator from shared objects file] 
[Loaded sun.misc.SignalHandler from shared objects file] 
[Loaded java.lang.Terminator$1 from shared objects file] 
[Loaded sun.misc.Signal from shared objects file] 
[Loaded sun.misc.NativeSignalHandler from shared objects file] 
[Loaded java.io.Console from shared objects file] 
[Loaded sun.misc.JavaIOAccess from shared objects file] 
[Loaded java.io.Console$1 from shared objects file] 
[Loaded java.io.Console$1$1 from shared objects file] 
[Loaded java.lang.Shutdown from shared objects file] 
[Loaded java.util.ArrayList from shared objects file] 
[Loaded java.lang.Shutdown$Lock from shared objects file] 
[Loaded java.lang.ApplicationShutdownHooks from shared objects file] 
[Loaded java.util.IdentityHashMap from shared objects file] 
[Loaded sun.misc.OSEnvironment from shared objects file] 
[Loaded sun.io.Win32ErrorMode from shared objects file] 
[Loaded sun.misc.JavaLangAccess from shared objects file] 
[Loaded java.lang.System$2 from shared objects file] 
[Loaded java.lang.NullPointerException from shared objects file] 
[Loaded java.lang.ArithmeticException from shared objects file] 
[Loaded java.lang.Compiler from shared objects file] 
[Loaded java.lang.Compiler$1 from shared objects file] 
[Loaded sun.misc.Launcher from shared objects file] 
[Loaded java.net.URLStreamHandlerFactory from shared objects file] 
[Loaded sun.misc.Launcher$Factory from shared objects file] 
[Loaded java.security.SecureClassLoader from shared objects file] 
[Loaded java.net.URLClassLoader from shared objects file] 
[Loaded sun.misc.Launcher$ExtClassLoader from shared objects file] 
[Loaded sun.security.util.Debug from shared objects file] 
[Loaded sun.misc.JavaNetAccess from shared objects file] 
[Loaded java.net.URLClassLoader$7 from shared objects file] 
[Loaded java.util.StringTokenizer from shared objects file] 
[Loaded java.security.PrivilegedExceptionAction from shared objects file] 
[Loaded sun.misc.Launcher$ExtClassLoader$1 from shared objects file] 
[Loaded sun.misc.MetaIndex from shared objects file] 
[Loaded java.io.Reader from shared objects file] 
[Loaded java.io.BufferedReader from shared objects file] 
[Loaded java.io.InputStreamReader from shared objects file] 
[Loaded java.io.FileReader from shared objects file] 
[Loaded sun.nio.cs.StreamDecoder from shared objects file] 
[Loaded java.lang.reflect.Array from shared objects file] 
[Loaded java.util.Locale from shared objects file] 
[Loaded java.util.concurrent.ConcurrentMap from shared objects file] 
[Loaded java.util.concurrent.ConcurrentHashMap from shared objects file] 
[Loaded java.util.concurrent.locks.Lock from shared objects file] 
[Loaded java.util.concurrent.locks.ReentrantLock from shared objects file] 
[Loaded java.util.concurrent.ConcurrentHashMap$Segment from shared objects file] 
[Loaded java.util.concurrent.locks.AbstractOwnableSynchronizer from shared objects file] 
[Loaded java.util.concurrent.locks.AbstractQueuedSynchronizer from shared objects file] 
[Loaded java.util.concurrent.locks.ReentrantLock$Sync from shared objects file] 
[Loaded java.util.concurrent.locks.ReentrantLock$NonfairSync from shared objects file] 
[Loaded java.util.concurrent.locks.AbstractQueuedSynchronizer$Node from shared objects file] 
[Loaded java.util.concurrent.ConcurrentHashMap$HashEntry from shared objects file] 
[Loaded java.lang.CharacterDataLatin1 from shared objects file] 
[Loaded java.io.ObjectStreamClass from shared objects file] 
[Loaded sun.net.www.ParseUtil from shared objects file] 
[Loaded java.util.BitSet from shared objects file] 
[Loaded java.net.URL from shared objects file] 
[Loaded java.net.Parts from shared objects file] 
[Loaded java.net.URLStreamHandler from shared objects file] 
[Loaded sun.net.www.protocol.file.Handler from shared objects file] 
[Loaded java.util.HashSet from shared objects file] 
[Loaded sun.misc.URLClassPath from shared objects file] 
[Loaded sun.net.www.protocol.jar.Handler from shared objects file] 
[Loaded sun.misc.Launcher$AppClassLoader from shared objects file] 
[Loaded sun.misc.Launcher$AppClassLoader$1 from shared objects file] 
[Loaded java.lang.SystemClassLoaderAction from shared objects file] 
[Loaded java.lang.StringCoding from shared objects file] 
[Loaded java.lang.ThreadLocal$ThreadLocalMap from shared objects file] 
[Loaded java.lang.ThreadLocal$ThreadLocalMap$Entry from shared objects file] 
[Loaded java.lang.StringCoding$StringDecoder from shared objects file] 
[Loaded java.net.URLClassLoader$1 from shared objects file] 
[Loaded sun.misc.URLClassPath$3 from shared objects file] 
[Loaded sun.misc.URLClassPath$Loader from shared objects file] 
[Loaded sun.misc.URLClassPath$JarLoader from shared objects file] 
[Loaded java.security.PrivilegedActionException from shared objects file] 
[Loaded sun.misc.URLClassPath$FileLoader from shared objects file] 
[Loaded sun.misc.Resource from shared objects file] 
[Loaded sun.misc.URLClassPath$FileLoader$1 from shared objects file] 
[Loaded sun.nio.ByteBuffered from shared objects file] 
[Loaded java.security.CodeSource from shared objects file] 
[Loaded java.security.PermissionCollection from shared objects file] 
[Loaded java.security.Permissions from shared objects file] 
[Loaded java.net.URLConnection from shared objects file] 
[Loaded sun.net.www.URLConnection from shared objects file] 
[Loaded sun.net.www.protocol.file.FileURLConnection from shared objects file] 
[Loaded java.net.ContentHandler from shared objects file] 
[Loaded java.net.UnknownContentHandler from shared objects file] 
[Loaded sun.net.www.MessageHeader from shared objects file] 
[Loaded java.io.FilePermission from shared objects file] 
[Loaded java.io.FilePermission$1 from shared objects file] 
[Loaded java.security.Policy from shared objects file] 
[Loaded sun.security.provider.PolicyFile from shared objects file] 
[Loaded java.security.Policy$UnsupportedEmptyCollection from shared objects file] 
[Loaded java.io.FilePermissionCollection from shared objects file] 
[Loaded java.security.AllPermission from shared objects file] 
[Loaded java.security.UnresolvedPermission from shared objects file] 
[Loaded java.security.BasicPermissionCollection from shared objects file] 
[Loaded java.security.Principal from shared objects file] 
[Loaded java.security.cert.Certificate from shared objects file] 
[Loaded ServidorTCP from file:/C:/Users/administrador/Documents/] 
[Loaded java.lang.IndexOutOfBoundsException from shared objects file] 
[Loaded java.lang.ArrayIndexOutOfBoundsException from shared objects file] 

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 
    at ServidorTCP.main(ServidorTCP.java:21) 

[Loaded java.util.AbstractList$Itr from shared objects file] 
[Loaded java.util.IdentityHashMap$KeySet from shared objects file] 
[Loaded java.util.IdentityHashMap$IdentityHashMapIterator from shared objects file] 
[Loaded java.util.IdentityHashMap$KeyIterator from shared objects file] 
[Loaded java.io.DeleteOnExitHook from shared objects file] 
[Loaded java.util.LinkedHashSet from shared objects file] 
[Loaded java.util.HashMap$KeySet from shared objects file] 
[Loaded java.util.LinkedHashMap$LinkedHashIterator from shared objects file] 
[Loaded java.util.LinkedHashMap$KeyIterator from shared objects file] 

Process completed. 

Answer 1

Vous devez spécifier le numéro de port sur la ligne de commande.

Il est toujours utile de savoir lire les journaux.

Voir. Dans vos journaux, vous avez un tas de noms de classe, mais il n'y a qu'un seul lié à votre code:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 
    at ServidorTCP.main(ServidorTCP.java:21) 

Le reste d'entre eux sont tous sur java.lang, java.util, java.io, etc, des cours que vous n'avez pas codé.

Si vous regardez cette ligne d'erreur, il dit:

java.lang.ArrayIndexOutOfBoundsException: 

Cela signifie que vous avez tenté d'accéder à un tableau hors de ses limites. C'est à dire que si la taille du tableau est 5, vous avez probablement tenté d'accéder au 6ème élément. C'est illégal, c'est une exception (plus formellement une RuntimeException qui signifie que vous avez une erreur de programmation)

Ensuite, le journal ajoute des informations là où c'est arrivé.

at ServidorTCP.main(ServidorTCP.java:21) 

Dans la ServidorTCP classe (dans le fichier java ServidorTCP à la ligne 21.

Vous pouvez jeter un oeil à ce fichier à cette ligne c'est ce qu'il montre:

20: // args [0] is the port number to be heard 
21: int puerto = new Integer(args[0]).intValue(); 

Cela dit , la valeur de la variable "puerto" sera un nouvel entier créé avec le contenu de args [0] C'est le premier élément du tableau args:

Ce tableau est défini dans la méthode principale:

public static void main(String args[]){ 

Et rempli automatiquement avec les arguments de ligne de commande. Par conséquent, si vous avez exécuté votre programme sans fournir d'argument, la recherche de l'index 0 dans les arguments du tableau échouera. Je ne sais pas exactement où dans jcreator vous pouvez ajouter des arguments de ligne de commande, mais je suis sûr que quelque part dans un menu "Exécuter", ou dans la configuration "Exécuter" ou quelque chose comme ça, il devrait y avoir quelque chose comme « arguments du programme » Vous pouvez remplir cette valeur avec un numéro de port, essayez d'utiliser 8085.

OU

Vous pouvez également modifier la ligne 21 du serveur et l'initialiser comme ceci:

//int puerto = new Integer(args[0]).intValue(); 
int puerto = 8085; // por mis pistolas :) 

Et le voir courir.

Vous devez être membre de ce groupe.

Chau!

Answer 2

Cela ressemble à quand vous démarrez le serveur que vous ne lui donnez pas d'arguments de ligne de commande. En d'autres termes, vous utilisez quelque chose comme:

java -cp . ServidorTCP 

quand vous devriez être en cours d'exécution

java -cp . ServidorTCP 40000 

(pour démarrer le serveur sur le port 40000)

Si vous commencez le programme à partir de l'EDI, vous devez savoir comment transmettre les arguments au démarrage du programme.

Answer 3

Comme c'est une exception ArrayIndexOutOfBounds, je commencerais à regarder où vous utilisez des tableaux. Donc, dans votre cas, c'est où vous essayez de saisir le numéro de port à partir du tableau d'arguments. Alors jetez-y un coup d'oeil, et assurez-vous que vous passez un numéro de port en tant qu'argument de ligne de commande.

Answer 4

Regardez la signature de votre principale méthode():

 
public static void main(String args[]) 

L'erreur est ici:

 
int puerto = new Integer(args[0]).intValue(); 

Si vous invoquez votre programme en passant pas d'arguments, il va essayer de lire un entier d'un tableau qui est en fait vide.

Si vous ne voulez pas se soucier de paramètres, faire ceci:

 
int arguments = new Integer (args.length); 

if (arguments = 0) { 
    this.puerto = 4000; 
} 

Cela devrait faire le travail. Si aucun argument n'est passé, le port 4000 (ou le port de votre choix) sera utilisé comme port par défaut.