Java online Chat Item resolves a problem when the client sends information to the server OutputStreamWriter DataOutputStream Socket.getoutputstream ()

The client code is not resolved before the problem:

 PackageCom.swift;Importjava.awt.BorderLayout;ImportJava.awt.Color;Importjava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;ImportJava.awt.event.WindowAdapter;Importjava.awt.event.WindowEvent;ImportJava.io.BufferedWriter;ImportJava.io.DataOutputStream;Importjava.io.IOException;ImportJava.io.OutputStreamWriter;ImportJava.net.Socket;Importjava.net.UnknownHostException;ImportJavax.swing.JButton;ImportJavax.swing.JFrame;ImportJavax.swing.JLabel;ImportJavax.swing.JPanel;ImportJavax.swing.JScrollPane;ImportJavax.swing.JTextArea;ImportJavax.swing.JTextField; Public classChatClientFrame2extendsJFrame {Private Static Final LongSerialversionuid = -118470059355655240l; Socket s=NULL; JLabel Label_shang=NewJLabel (); JLabel Label_xia=NewJLabel (); JTextField TF=NewJTextField (38); JTextArea Ta=NewJTextArea (15, 50); JButton Button=NewJButton ();  PublicChatClientFrame2 () {setbounds (200, 200, 500, 400); Settitle ("Client Chat tool--0.4"); //Large layout of the window, divided into three rows and a column, add three panels on the pbasic panel Shang Zhong XiaJPanel pbasic=NewJPanel (); Pbasic.setlayout (NewBorderLayout ());//This layout mode is also not set by defaultSetcontentpane (Pbasic);//Put the Panel on the window, do not remember to use the This keywordJPanel shang=NewJPanel (); JPanel Zhong=NewJPanel (); JPanel Xia=NewJPanel (); //to set the size of the JPanel panelShang.setsize (470, 25); Zhong.setsize (470, 180); Xia.setsize (470, 40);        Pbasic.add (Shang,borderlayout.north);        Pbasic.add (Zhong,borderlayout.center);        Pbasic.add (Xia,borderlayout.south);        Shang.setbackground (color.red);        Zhong.setbackground (Color.yellow);        Xia.setbackground (Color.Blue); /** Three panels, put a label "chat history", put a text field in the middle, * the bottom is divided into left and right--put the label "input Information", text box and "Send" button*/Label_shang.settext ("Chat History");        Shang.add (Label_shang); Ta.setlinewrap (true);//Wrap LineJScrollPane scroll=NewJScrollPane (TA);//increase the scrollbar so that the number of rows is not increasedZhong.add (scroll); Label_xia.settext ("Enter Information");        Xia.add (label_xia,borderlayout.west); /** Added function, Window Listener event, window open when setting cursor focus in tf text field*/         This. Addwindowlistener (NewWindowadapter () {@Override Public voidwindowopened (windowevent e) {tf.requestfocus ();        }        });        Xia.add (Tf,borderlayout.center); Button.settext (Send);        Xia.add (Button,borderlayout.east); /** Add the function of "Send" button, increase the function of carriage return, monitor the same, * use inner class implementation to improve code reusability*/        Final classSharelistenerImplementsactionlistener{@Override Public voidactionperformed (ActionEvent e) {String Tatext=Ta.gettext (); String Tftext=tf.gettext () + "\ r \ n"; Ta.settext (Tatext+tftext); Tf.settext (""); //when the carriage return or send button is Tftext sent to the server                Try {                    //you can try using the writeUTF method in DataOutputStream.//dataoutputstream ds=new DataOutputStream (S.getoutputstream ());//Ds.writeutf (tftext);//Ds.flush ();//ds.close ();BufferedWriter bw=NewBufferedWriter (NewOutputStreamWriter (S.getoutputstream (), "Utf-8"));                    Bw.write (Tftext);                Bw.close (); } Catch(IOException E1) {//TODO auto-generated Catch blockE1.printstacktrace (); }}} Button.addactionlistener (NewSharelistener ()); Tf.addactionlistener (NewSharelistener ()); //Auto-Adjust individual panels with compressionpack (); Setdefaultcloseoperation (jframe.exit_on_close);//Click the Close button while exiting the programSetVisible (true); //Create a form to call the connection server directlyConnect (); }        /** Add a method to connect to the server*/     Public voidConnect () {Try{s=NewSocket ("127.0.0.1", 8888); System.out.println ("Connected!"); } Catch(unknownhostexception e) {//TODO auto-generated Catch blockE.printstacktrace (); } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }    }         Public Static voidMain (string[] args) {//don't forget to create a Form object, or you can call other methods with a build object such as Launchframe ()        NewChatClientFrame2 (); }}

The service-side code is not resolved before the problem:

 PackageCom.swift;ImportJava.io.BufferedReader;ImportJava.io.DataInputStream;Importjava.io.IOException;ImportJava.io.InputStreamReader;ImportJava.net.ServerSocket;ImportJava.net.Socket; Public classChatserver { Public Static voidMain (string[] args) {Try{ServerSocket ss=NewServerSocket (8888);  for (;;) {Socket s=ss.accept (); //when there is a connection, it is displayed for testingSYSTEM.OUT.PRINTLN ("A client connected success"); //you can try using the readUTF method in DataInputStream//datainputstream dis=new DataInputStream (S.getinputstream ());//String Str=dis.readutf ();//dis.close ();bufferedreader BR=NewBufferedReader (NewInputStreamReader (S.getinputstream (), "Utf-8")); String Str=Br.readline ();            System.out.println (str); }        } Catch(IOException e) {//TODO auto-generated Catch blockE.printstacktrace (); }    }}

Presentation process

A problem occurred:

Java.net.SocketException:Socket is closed

Java online Chat Item resolves a problem when the client sends information to the server OutputStreamWriter DataOutputStream Socket.getoutputstream ()