io - Writing to a text file issue Java -

-

i coding function check if file cq.txt exists , if so, read it. have been having issue have declared printwriter outside of while loop. later in application, supposed write question 1: correct or question 2: correct file.

but, not. creates text file when check it, shows empty.

here code, thank in advance:

package receiverhost;  import java.io.*; import java.net.*;  public class receiverhost { public static void main(string[] args) throws exception {      //set socket on port 5000     serversocket server = new serversocket(5000);      //set "cookie"/ text file written to/ read     writer db = new bufferedwriter(new outputstreamwriter(new fileoutputstream("cq.txt"), "utf-8"));      system.out.println("tcpserver waiting client on port 5000");      while(true){          //declare string fromclient         string fromclient;          socket connected = server.accept();         system.out.println(" client" + " " + connected.getinetaddress() + ":" + connected.getport() + " connected ");          //read/ retrieve client output stream         bufferedreader infromclient = new bufferedreader(new inputstreamreader(connected.getinputstream()));              fromclient = infromclient.readline();             if(fromclient.equals("q1c")){                 //write cq.txt                 db.write("q1: correct");             }              if(fromclient.equals("q2c")){                 //write cq.txt                 db.write("q2: correct");             }         }     } }

you should call 'write' method on bufferedwriter, , later 'close' it. here example:

how write text file java


Comments

Post a Comment

Popular posts from this blog

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more