java - How do I close a UDP server without throwing an exception? -

-

i have server waits incoming client messages , uses udp. when try close udp connection ioexception..

public void run(){       string user_message = null;      try {             connection = startserver();             system.out.println("server started");             while ((true) && (serverstarted) ){                      try {                               user_message = receivemessage();                             check_query( user_message , "," );                      } catch ( ioexception ex ) {                             system.out.println("error1 "+ex.getmessage());                             seterror( "error establishing connection " ) ;                             txt_log.settext(txt_log.gettext() + "\n error establishing connection0") ;                             break;                         }                 }             system.out.println("server stopped.....");         }     catch ( socketexception ex ) {             system.out.println("error2 "+ex.getmessage());             seterror("error establishing connection ") ;             txt_log.settext(txt_log.gettext() + "\n error establishing connection1") ;         }     catch( nullpointerexception ex){             system.out.println("error3 "+ex.getmessage());             ex.printstacktrace();             seterror("error null pointer ") ;             txt_log.settext(txt_log.gettext() + "\n error :"+ex.getmessage()) ;     } }      /*  * method starts server datagram bind port  */  public datagramsocket startserver() throws socketexception{              return new datagramsocket(10000); }     /*  * method stops server server not able receive client requests  */  public void closeserver(){          if (connection != null){                 //connection.disconnect();                 connection.close();                 //connection = null;          } }    /*  * method sends message via datagram client  */  private void sendmessage( string message ) throws ioexception{          byte[] message_byte = message.getbytes();         packet_send = new datagrampacket( message_byte , message_byte.length , packet_receive.getaddress() , packet_receive.getport() );         connection.send( packet_send ); }     /*  * method receives messages clients  */ private string receivemessage() throws ioexception,nullpointerexception{     if (connection!=null){         byte[] buf = new byte[256];         packet_receive = new datagrampacket( buf , buf.length ) ;         connection.receive( packet_receive ) ;         return getstring( packet_receive );     }     throw new nullpointerexception("connection cannot null"); }    /*  * method retrieves data packet , converts string  */  private string getstring(datagrampacket packet){          string string = new string ( packet.getdata() , 0 , packet.getlength()).trim();         return string; }   private void drop_dbconnection(){     if (db_connection!=null){         try{             db_connection.close();             //db_connection = null;              }         catch(sqlexception e){                  txt_log.settext("server connection error...");                 seterror("cannot close database connection");             }          } }  public void closeserver(){          if (connection != null){                 //connection.disconnect();                 connection.close();                 //connection = null;          } }

private void btn_stopactionperformed(java.awt.event.actionevent evt) { 

        if ( serverstarted ){                      txt_log.settext( txt_log.gettext()+"\nserver has been stopped ...." ) ;                     serverstarted = false ;                     drop_dbconnection() ;                     closeserver();                      btn_start.setenabled( true ) ;                     btn_stop.setenabled( false );          }        }

my output , stacktrace

server started server started..... error1 socket closed server stopped..... java.net.socketexception: socket closed          @ java.net.plaindatagramsocketimpl.receive0(nativemethod)          @ java.net.plaindatagramsocketimpl.receive(plaindatagramsocketimpl.java:136)          @ java.net.datagramsocket.receive(datagramsocket.java:712)          @ server.server.receivemessage(server.java:608)          @ server.server.run(server.java:528)          @ java.lang.thread.run(thread.java:619)

how close server no exception thrown?

the exception closed because closed exception. can catch exception , continue rather printing out. best way handle this.


Comments

Post a Comment

Popular posts from this blog

python - Scipy curvefit RuntimeError:Optimal parameters not found: Number of calls to function has reached maxfev = 1000 -

-
Image
i want make logharitmic fit. keep getting runtime error: optimal parameters not found: number of calls function has reached maxfev = 1000 i use following script. can tell me go wrong? use spyder still beginner. import math import matplotlib mpl scipy.optimize import curve_fit import numpy np #data f1=[735.0,696.0,690.0,683.0,680.0,678.0,679.0,675.0,671.0,669.0,668.0,664.0,664.0] t1=[1,90000.0,178200.0,421200.0,505800.0,592200.0,768600.0,1036800.0,1371600.0,1630800.0,1715400.0,2345400.0,2409012.0] f1n=np.array(f1) t1n=np.array(t1) plt.plot(t1,f1,'ro',label="original data") # curvefit def func(t,a,b): return a+b*np.log(t) t=np.linspace(0,3600*24*28,13) popt, pcov = curve_fit(func, t, f1n, maxfev=1000) plt.plot(t, func(t, *popt), label="fitted curve") plt.legend(loc='upper left') plt.show() your original data t1 , f1 . therefore curve_fit should given t1 second argument, not t . popt, pcov = curve_fit(func,
Read more

c# - How to add a new treeview at the selected node? -

-
i have treeview 4 levels; parent, child, grandchild, great-grandchild. selectednode @ grandchild level. what i'm trying create new "treeview" @ grandchild - no, dont wnat create new node "selectednode" (grandchild). should somelike this: parent child grandchild (new treeview) parent grandchild great-grandchild child great-grandchild child grandchild grandchild it similar parent table mother , father went off , had new childern different spouse other spouse of there existing children. private sub populaterootlevel() ' query find first round of parent populatenodes(dt, jcatreeview.nodes) end sub private sub populatenodes(byval dt datatable, byval nodes treenodecollection) each dr datarow in dt.rows dim tn new treenode() tn.text = dr("title").tostring()
Read more

java - netbeans "Please wait - classpath scanning in progress..." -

-
when try compile netbeans projects message/error : "please wait - classpath scanning in progress..." and nothing happens , have have wait enternity conmpile "hello world"... now first thing have moved new office building, laptop same. it's secure enviroment lot of "security", can't connect anywhere almost. have changed user dir in netbeans.conf save data in c:\program files\user any ideas how fix this? alrady tried reinstalling netbeans, changing save location between standart , newone... just ideas find problem look @ cpu - netbeans busy (100% on 1 core) or blocking (95% idle)? standard, ant or maven build? libraries , use absolute or relative paths? start simple "hello world" project (no dependencies), add 1 lib (log4j or similiar), located in project folder , - if works - move lib other locations (choose locations similiar libs on real classpath) there chance, don't have access rights folders/shares conta
Read more