Java NIO Socketchannel Client Example (automatic reconnection after connection failure)

These two days to find the title of the example code, found that so many tutorials on the web, even how to achieve automatic re-connect do not speak, so write their own examples to paste up. Using recursion only, without multithreading, can achieve the initial goal:

Import Java.io.ioexception;import Java.net.connectexception;import Java.net.inetsocketaddress;import Java.nio.bytebuffer;import Java.nio.channels.selectionkey;import Java.nio.channels.selector;import Java.nio.channels.socketchannel;import Java.util.timer;public class Nioclient {//Channel selector private Selector selector;// The channel that communicates with the server Socketchannel socketchannel;//the IP address of the server to be connected private String hostip;//The remote server to be connected on the listening port private int Hostlistenningport;private static Boolean timetocken=false;private static timer timer = new Timer ();p rivate static Boolea  N timerset=false;/** * Constructor * * @param hostip * @param hostlistenningport * @throws ioexception */public nioclient (String HostIP, int hostlistenningport) throws IOException {This.hostip = Hostip;this.hostlistenningport = HostListenningPort; Initialize ();} private void Initialize () throws IOException {//Open listening channel and set to non-blocking mode Try{socketchannel = Socketchannel.open (new Inetsocketaddress (Hostip,hostlistenningport));} catch (Connectexception e) {System.out.println ("Error happened when establishing connection, try again 5s later "); try {thread.sleep ()} catch (Interruptedexception E1) {E1 . Printstacktrace ();} if (!timerset) {timer.schedule (New Settocken (), 15000); timerset=true;} if (!timetocken) {initialize ();} return;} Socketchannel.configureblocking (false);//Open and register selector to channel Selector = Selector.open (); Socketchannel.register (Selector, Selectionkey.op_read);} /** * Send string to server * * @param message * @throws ioexception */public void sendmsg (String message) throws IOException {Bytebu Ffer WriteBuffer = Bytebuffer.wrap (Message.getbytes ("UTF-8")); Socketchannel.write (WriteBuffer);} public static void Main (string[] args) throws IOException {nioclient client = new Nioclient ("127.0.0.1", 12000); Client.sen Dmsg ("This is a nioclient, testing"); Client.end (); Timer.cancel ();} private void End () {//Todo auto-generated method stubtry {socketchannel.close ();} catch (IOException e) {//Todo Auto-gen Erated catch Blocke.printstacktrace ();}} Static class Settocken extends Java.util.TimerTaSK {@Overridepublic void run () {//TODO auto-generated method stubtimetocken=true;}}} 

Java NIO Socketchannel Client Example (automatic reconnection after connection failure)