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Editor to share with you how to achieve java online chat room, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Online chat room

Server:

Public class Chat {public static void main (String [] args) throws IOException {System.out.println ("server starting..."); / / create server ServerSocket server=new ServerSocket (9999); / / blocking wait connection, open while (true) {Socket client=server.accept (); System.out.println ("A client has established a connection") after the client Socket has been created. New Thread (()-> {DataInputStream dis = null; DataOutputStream dos = null; try {dis = new DataInputStream (client.getInputStream ()); dos = new DataOutputStream (client.getOutputStream ());} catch (IOException E1) {e1.printStackTrace ();} boolean flag=true; while (flag) {String msg = null Try {msg = dis.readUTF (); dos.writeUTF (msg); dos.flush ();} catch (IOException e) {/ / when the client is disconnected, there is no need to loop to read the data flag=false } / / return message} try {if (nullroomroomdos) {dos.close ();}} catch (IOException e) {e.printStackTrace ();} try {if (nullroomroomdos) {dis.close () }} catch (IOException e) {e.printStackTrace ();} try {if (null filling client) {client.close ();}} catch (IOException e) {e.printStackTrace ();}}) .start ();}

Client:

Public class Client {

Public static void main (String [] args) throws UnknownHostException, IOException {System.out.println ("client launching..."); Socket client=new Socket ("localhost", 9999); / / client sending message BufferedReader br=new BufferedReader (new InputStreamReader (System.in)); DataOutputStream dos=new DataOutputStream (client.getOutputStream ()); DataInputStream dis = new DataInputStream (client.getInputStream ()); boolean flag=true; while (flag) {System.out.println ("Please enter message") String msg=br.readLine (); dos.writeUTF (msg); dos.flush (); / / get the message msg=dis.readUTF (); System.out.println (msg);} dos.close (); dis.close (); client.close ();}} these are all the contents of the article "how to implement an online chat room in java". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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