Android uses websocket protocol to communicate with the server

A recent project requires the server to actively push messages to the client. In this case, the HTTP connection is unavailable. The blogger asked a friend and recommended the websocket protocol to me. I tested it and found that the effect was good.

Android itself does not websocket library, need to download http://autobahn.ws/android/downloads

Client code ....

The interface layout is self-written, which is very simple with two buttons

Package COM. example. test; import COM. example. test. r; import android. app. activity; import android. OS. bundle; import android. view. view; import android. view. view. onclicklistener; import android. widget. button; import android. widget. edittext; import android. widget. toast; import de. tavendo. autobahn. websocketconnection; import de. tavendo. autobahn. websocketconnectionhandler; import de. tavendo. autobahn. websocketexcept Ion; public class mainactivity extends activity implements onclicklistener {private button Bt; private edittext ed_name; private edittext ed_text; private button Bt1; websocketconnection WSC; @ overrideprotected void oncreate (bundle savedinstancestate. oncreate (savedinstancestate); setcontentview (R. layout. activity_main); bt = (button) findviewbyid (R. id. BT); ed_name = (edittext) findviewbyid (R. id. ed_n AME); ed_text = (edittext) findviewbyid (R. id. ed_text); Bt1 = (button) findviewbyid (R. id. bt1); BT. setonclicklistener (this); bt1.setonclicklistener (this); WSC = new websocketconnection ();} private void connect () {system. out. println ("START websocket //"); try {WSC. connect ("WS: // 192.168.1.245: 8080/driveserver/mainservlet", new websocketconnectionhandler () {@ overridepublic void onbinarymessage (byte [] payload) {s Ystem. out. println ("onbinarymessage size =" + payload. length) ;}@ overridepublic void onclose (INT code, string reason) {system. out. println ("onclose reason =" + reason);} @ overridepublic void onopen () {system. out. println ("onopen"); showtext ("connection successful"); // WSC. sendtextmessage ("Hello! "); // WSC. disconnect () ;}@ overridepublic void onrawtextmessage (byte [] payload) {system. out. println ("onrawtextmessage size =" + payload. length) ;}@ overridepublic void ontextmessage (string payload) {system. out. println ("ontextmessage" + payload); showtext (payload) ;}});} catch (websocketexception e) {// todo auto-generated catch blocke. printstacktrace () ;}@ overridepublic void onclick (view v) {// todo auto-generated method stubint id = v. GETID (); Switch (ID) {case R. id. BT: WSC. sendtextmessage ("I Am a client, I send data to the server through ws"); break; case R. id. bt1: connect (); break; default: break;} private void showtext (string MSG) {toast. maketext (this, MSG, 0 ). show ();}}

The following is the server code:

Use the websocket library that comes with jetty7.

Package COM. websocket; import Java. io. ioexception; import Java. io. unsupportedencodingexception; import Java. NIO. bytebuffer; import Java. NIO. charbuffer; import Java. text. simpledateformat; import Java. util. arraylist; import Java. util. date; import Java. util. hashmap; import Java. util. list; import Java. util. map; import Java. util. set; import javax. servlet. servletexception; import javax. servlet. HTTP. httpservletrequest; Import javax. servlet. HTTP. httpservletresponse; import Org. eclipse. jetty. websocket. websocket; import Org. eclipse. jetty. websocket. websocket. ontextmessage; import Org. eclipse. jetty. websocket. websocketservlet; public class chatwebsocketservlet extends websocketservlet {Private Static final long serialversionuid = 911879078000755859l; private list <mywebsocket> List = new arraylist <mywebsocket> (); Class mywe Bsocket implements ontextmessage {private string username = "anonymous user"; Public mywebsocket (string username) {If (username! = NULL & username. length ()> 0) {This. username = username ;}} private connection conn; Public void onclose (INT arg0, string arg1) {// todo auto-generated method stubsystem. out. println ("onopen disconnected ........ "+ Arg1 +" "+ arg0); list. remove (this);} public void onopen (connection arg0) {// todo auto-generated method stubsystem. out. println ("onopen connection ............ "+ Arg0.getmaxidletime (); this. Conn = arg0; If (! List. contains (arg0) {list. add (this);} else {system. out. println ("this user has connected");} system. out. println (".. "+ list. size ();} public void onmessage (string arg0) {string toname = arg0.substring (0, 3); system. out. println ("toname -->" + toname); try {list. get (0 ). getconn (). sendmessage (arg0.substring (3); system. out. println ("sent data" + arg0.substring (3);} catch (ioexception e) {// todo auto-generated catch blocke. printstacktrace () ;}} private connection getconn () {return this. conn ;}} public websocket dowebsocketconnect (httpservletrequest arg0, string arg1) {// todo auto-generated method stubstring name = ""; name = arg0.getparameter ("username"); system. out. println (name + "is connected"); return New mywebsocket (name) ;}@ overrideprotected void Service (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {// todo auto-generated method stubsuper. service (request, response );}}

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