Instant Messaging liteip-II chatlist

The chatlist list lists all users in the current LAN. Double-click a user to communicate with the user.

Chatlist. Java:

Package chat; <br/>/** <br/> * @ (#) chatlist. java <br/> * @ author Tom <br/> * @ Version 1.00 2008/12/30 <br/> */<br/>/** <br/> * LAN chat tool liteip <br/> **/<br/> Import Java. AWT. list; <br/> Import Java. AWT. button; <br/> Import Java. AWT. label; <br/> Import Java. AWT. frame; <br/> Import Java. AWT. panel; <br/> Import Java. AWT. event. *; <br/> Import java.net. serversocket; <br/> Import java.net. socket; <br/> Import ja Va.net. datagramsocket; <br/> Import java.net. inetaddress; <br/> Import java.net. extends rampacket; <br/> Import Java. util. hashset; <br/> // import Java. util. hashtable; <br/> // import Java. io. inputstream; <br/> // import Java. io. outputstream; <br/> // import Java. io. bufferedreader; <br/> // import Java. io. bufferedwriter; <br/> // import Java. io. printwriter; <br/> // import Java. io. inputstreamreader; </P> <p> @ suppresswa Rnings ("serial") <br/> public class chatlist extends frame {<br/> Private Static int D = 0; // used for debugging <br/> private list friends; // for online users, check whether an address already exists in the list. Use equals to compare <br/> private button chat; // chat button, click to bring up the chat dialog box <br/> private label name; // display the selected user <br/> Private Static datagramsocket sender; // send a UDP packet to the LAN <br/> Private Static datagramsocket receiver; // accept UDP packets of other users <br/> Public static hashset <chatwith> HT; // open Dialog Box maintenance table <br/> // public static hashtable <inetaddress, socket> ht2; // socket maintenance list, (inetaddress, socket) <br/> Public final staticint senderport = 8888; // sending port <br/> Public final static int receiverport = 8080; // receiving port <br/> private inetaddress multicast; <br/>/** <br/> * before creating a cost object instance, call the setjavasramsocket method <br/> * to avoid generating two chatlist instances. <br/> * PS: if you want to achieve this through the "list mode", it is not feasible to tell you here. <Br/> * This method is only called externally and is not called in this instance <br/> */<br/> Public static Boolean setjavasramsocket () {<br/> Boolean flag = true; <br/> try {<br/> // allocate a port <br/> // system. out. println ("chatlist" + (d ++); // 0 <br/> sender = new datagramsocket (senderport); <br/> receiver ER = new datagramsocket (receiverport ); <br/> // system. out. println ("chatlist" + (d ++); // 1 <br/>}catch (exception e) {<br/> flag = false; <br/> system. out. println ("error I N chatlist port allocate. "); <br/> system. out. println (E); <br/>}< br/> return flag; <br/>}< br/>/* <br/> In the constructor, complete most of the Operations <br/> build an object, add listeners, and build the thread for sending UDP packets and the thread for receiving UDP packets <br/> */<br/> Public chatlist () {<br/> ht = new hashset <chatwith> (); // construct an online user maintenance table <br/> // ht2 = new hashtable <inetaddress, socket> (); // construct a socket table with online users <br/> friends = new Java. AWT. list (20, false); // build a container that displays online users. 20 rows are displayed at a time. You cannot select multiple <br/> friends. additemlisten Er (New listenitem (); // Add and click the listener. The label of the button will change. <br/> friends. addactionlistener (New listendoubleclick (); // Add a double-click listener <br/> chat = new button ("chat with"); <br/> name = new label (); <br/> chat. addactionlistener (New listendoubleclick (); // Add a listener to the button <br/> panel P = new Panel (); // Add each widget <br/> P. setlayout (null); <br/> P. add (Friends); <br/> P. add (CHAT); <br/> P. add (name); <br/> Add (p); <br/>/** <br/> * exit the listener in the window <br/> * Attention: When you exit the program, you need to send the checkout string to the LAN User <br/> **/<br/> addwindowlistener (<br/> New windowadapter () {<br/> Public void windowclosing (invalid wevent e) {<br/> try {<br/> string STR = new string ("checkout "); <br/> byte [] IP = Str. getbytes (); <br/> If (Multicast! = NULL & sender! = NULL) {<br/> // numeric report, the byte to be sent, the length of the byte, the sending Address (broadcast address ), receiving port <br/> datagrampacket dp = new datagrampacket (IP, IP. length, multicast, receiverport); <br/> sender. send (DP); <br/>}< br/>}catch (exception ex) {<br/> system. out. println ("error occurs when sending checkout message. "); <br/> system. out. println (Ex); <br/>}< br/> system. exit (0); <br/>}< br/>); <br/> // send a UDP packet to other users on the LAN, notify yourself that you have launched <br/> senditem (); <br/> // accept The UDP packet sent by other users is accepted by the thread. <Br/> New additem (). start (); <br/> // listen for connection requests sent by other users <br/> New listening (). start (); <br/> // system. out. println ("chatlist: chatlist ():" + (d ++ )); // 7 <br/>}< br/>/** <br/> * It is said that the layout is controlled, <br/> * only needs to be refined in the future <br/> **/<br/> Public void dolayout () {<br/> // int whoalw = (INT) This. getsize (). getwidth ()-2; <br/> // int whoalh = (INT) This. getsize (). getheight ()-2; <br/> int friendsw = (INT) (friends. getpreferredsize (). Getwidth (); <br/> int friendsh = (INT) (friends. getpreferredsize (). getheight (); <br/> int chatw = (INT) (chat. getpreferredsize (). getwidth (); <br/> int chath = (INT) (chat. getpreferredsize (). getheight (); <br/> int namew = (INT) (name. getpreferredsize (). getwidth (); <br/> int nameh = (INT) (name. getpreferredsize (). getheight (); <br/> friends. setbounds (0, 0, friendsw + 3, friendsh + 5); <br/> chat. setbounds (friendsw + 10, 4, chatw + 5, chath + 5); <br/> name. setbounds (friendsw + 10, 4 + chath + 5 + 4, 4 * namew + 20, nameh + 5); <br/> super. dolayout (); <br/> // system. out. println ("chatwith: dolayout:" + (d ++); <br/>}< br/>/** <br/> * click the listener, change the label of the button <br/> **/<br/> private class listenitem implements itemlistener {<br/> Public void itemstatechanged (itemevent E) {<br/> // system. out. println ("chatlist: listenitem: itemstatechanged:" + (D ++); <br/> // display the IP address of the selected item <br/> name. settext (friends. getselecteditem (); <br/>}< br/>/** <br/> * double-click the listener, create chat dialog box <br/> * only transmits the inetaddress constructed by the IP address of the Peer party as a parameter <br/> **/<br/> private class listendoubleclick implements actionlistener {<br/> inetaddress ADDR; <br/> string STR; <br/> Public void actionreceivmed (actionevent E) {<br/> try {<br/> // obtain the selected IP address <br/> STR = friends. getselecteditem (); <br/> // Build inetaddress Based on the selected items <br/> ADDR = inetaddress. getbyname (STR); <br/> // If the clicked address is not in the maintenance list, create a dialog box <br/> // If the clicked address is already in the maintenance list, indicates that the user clicked the address twice <br/> If (! Util. isthisipin (ADDR, HT) {<br/> chatwith CW = new chatwith (ADDR, (socket) null); <br/> CW. settitle ("chat with" + friends. getselecteditem (); <br/> CW. setsize (400,400); <br/> CW. setvisible (true); <br/> // Add to the maintenance list of the open dialog box <br/> ht. add (CW); <br/>}< br/>}catch (exception ex) {<br/> system. out. println ("error occurs when you want to chat with" + STR + (d ++); <br/> system. out. println (Ex); <br/>}< br/>/* <br /> Send UDP messages to other users in the LAN, checkin <br/> */<br/> private void senditem () {<br/> try {<br/> // construct the LAN broadcast address <br/> inetaddress MC = inetaddress. getbyname ("255.255.255.255"); <br/> // The local IP address is no longer sent here, because the receiver can identify the IP address of the sender through UDP packets <br/> // to work with this program, send the string checkin here <br/> // Of Course, when exiting this program, you need to send a checkout so that machines in the LAN can remove themselves from their list <br/> string STR = new string ("checkin "); <br/> byte [] IP = Str. getbytes (); <br/> // construct a datagram, the message to be sent (checkin), the length of the message to be sent, broadcast Address, receiving port <br/> datagrampacket dp = new datagrampacket (IP, IP. length, MC, receiverport); <br/> If (sender! = NULL) <br/> sender. send (DP); <br/>}catch (exception e) {<br/> system. out. println ("error occurs when senditem" + (d ++); <br/> system. out. println (E); <br/>}</P> <p>/* <br/> * listens to other users online, obtain UDP packets <br/> * obtain by thread <br/> */<br/> private class additem extends thread {<br/> Public void run () {<br/> while (true) {<br/> try {<br/> If (else er! = NULL) {<br/> byte [] B = new byte [1024]; <br/> // constructs a datagram to receive data, byte array, array length <br/> datagrampacket dp = new datagrampacket (B, B. length); <br/> // receives packets from the LAN <br/> receiver. receive (DP); <br/> // obtain the data <br/> B = DP. getdata (); <br/> // obtain the incoming data, checkin or checkout <br/> // note that, leading and trailing leading spaces should be removed <br/> string STR = new string (B ). trim (); <br/> // get the address in the package <br/> string ADDR = DP. getaddress (). gethostaddress (); <br/> If (ADDR! = NULL & Str. Equals ("checkin ")&&! Util. isinfriends (ADDR, Friends) {<br/> // The checkin data is received, and the address is not in the user list, add to friends user list <br/> friends. add (ADDR); <br/> // send a checkin message to the other user. <br/> STR = new string ("checkin"); <br/> B = Str. getbytes (); <br/> // construct the datagram, the message to be sent, the length of the message to be sent, the address to be sent, and the receiving port <br/> inetaddress iaddr = inetaddress. getbyname ("commandid 255.255"); <br/> dp = new datagrampacket (B, B. length, iaddr, receiverport); <br/> If (sender! = NULL) <br/> sender. send (DP); <br/>}< br/> // If the checkout message is sent, delete this address from the user list <br/> else if (util. isinfriends (STR, Friends) & Str. equals ("checkout") {<br/> // Delete this address from the display <br/> friends. remove (ADDR); <br/>}< br/> sleep (10); <br/>} catch (exception E) {<br/> system. out. println ("error occurs when additem to friends" + (d ++); <br/> system. out. println (E); <br/>}< br/>/* <br/> obtain external t CP request, and expand the dialog <br/> when a new external request is sent, open the dialog box <br/> */<br/> private class listening extends thread {<br/> serversocket Server = NULL; <br/> Public void run () {<br/> try {<br/> Server = new serversocket (receiverport); // build the socket listener <br/> while (true) {<br/> Socket socket = server. accept (); <br/> // After listening to a socket, construct the response address <br/> inetaddress iaddr = socket. getinetaddress (); <br/> // if you are talking to yourself <br/> If (util. isinetself (iaddr) {<br/> Chatwith CW = new chatwith (iaddr, socket); <br/> CW. settitle ("chat with" + (socket. getinetaddress ()). gethostaddress (); <br/> CW. setsize (400,400); <br/> CW. setvisible (true); <br/>}< br/> // if the address is already in the maintenance list, the local dialog box <br/> // is also double-clicked. <br/> else if (util. isthisipin (iaddr, HT) {<br/> util. getthatcw (iaddr, HT ). setsocket (socket); <br/>}< br/> // If the dialog box is not displayed locally, the else if (! Util. isthisipin (iaddr, HT) {<br/> chatwith CW = new chatwith (iaddr, socket); <br/> CW. settitle ("chat with" + (socket. getinetaddress ()). gethostaddress (); <br/> CW. setsize (400,400); <br/> CW. setvisible (true); <br/> ht. add (CW); <br/>}< br/> sleep (1000); <br/>}< br/>} catch (exception E) {<br/> system. out. println ("error occurs when listening" + (d ++); <br/> system. out. println (E); <br/> try {<br/> server. close (); <br/>}catch (exception ex) {<br/> system. out. println ("error occurs when closing server" + (d ++); <br/> system. out. println (Ex); <br/>}< br/>}