Which Java IO class is better to use for a simple shell interpreter? -

-

i new java io library, have trouble choosing right class purposes. write simple shell client file transferring server. client should understand 3 commands: list files in remote directory (optionally can take nested directory path argument), download specified file (with file path required argument) , end session (a separate command). concerned handling user's input @ moment. questions are:

  1. should read whole line of input, tokenize , logic, or better tokenize input comes , make immediate decisions based on it?
  2. what class should use tokenize input: scanner or streamtokenizer? or taking account commands simple use bufferedreader read line, split string "\\s+" pattern?

the questions may seem subjective in way want diminish confusion , understand specific use cases of io classes.

  1. considering commands basic, reading whole input , tokenizing require lot of efforts. better tokenize input , take decisions required.

  2. i think bufferedreader sufficient serve purpose here. make code easy. when working on taking input csv file , tokenizing display graph used same. logic parsing string goes below:- 

      string splitby = ";"; // using csv file below used ";" splitter. can change per needs    bufferedreader br = new bufferedreader(new filereader("file.csv"));   string line = br.readline();   while((line = br.readline()) != null)   {        string[] b = line.split(splitby);        //take actions need perform   }   br.close();

hope answers question. let me know if more details required.


Comments

Post a Comment

Popular posts from this blog

ios - RestKit 0.20 — CoreData: error: Failed to call designated initializer on NSManagedObject class (again) -

-
this error has shown on many times, seems. prominent answer issue seems restkit 0.20 — coredata: error: failed call designated initializer on nsmanagedobject class however, solution posted doesn't work me. let's start beginning: i want upload file server. want parse response make sure uploaded. if not, try again later. model has boolean variable called nsnumber *senttoserver purpose (in coredata, bool saved nsnumber ) . because don't know whether sending going successful, save entity coredata model first before sending via restkit. when post request successful, server returns json string this: {"id":14,"created":true} notice that, of course, id not set on coredata model yet, both id , created new informations model. here's model: @interface recording : nsmanagedobject @property (nonatomic, retain) nsstring * audiofilepath; @property (nonatomic, retain) nsdate * createdat; @property (nonatomic, retain) nsstring * deviceid; @...
Read more

java - Digest auth with Spring Security using javaconfig -

-
so i'm trying create digest authentication spring following documentation trying translate xml "requirements" in java requirements. let's have xml in docs: <bean id="digestfilter" class= "org.springframework.security.web.authentication.www.digestauthenticationfilter"> <property name="userdetailsservice" ref="jdbcdaoimpl"/> <property name="authenticationentrypoint" ref="digestentrypoint"/> <property name="usercache" ref="usercache"/> </bean> <bean id="digestentrypoint" class= "org.springframework.security.web.authentication.www.digestauthenticationentrypoint"> <property name="realmname" value="contacts realm via digest authentication"/> <property name="key" value="acegi"/> <property name="noncevalidityseconds" value="10"/> </b...
Read more

laravel - PDOException in Connector.php line 55: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES) -

-
my .env: app_env=local app_debug=true app_key=myappkey app_url=http://localhost db_connection=mysql db_host=localhost db_port=3306 db_database=gestiontaller db_username=root db_password='root' cache_driver=file session_driver=file queue_driver=sync redis_host=127.0.0.1 redis_password=null redis_port=6379 mail_driver=smtp mail_host=mailtrap.io mail_port=2525 mail_username=null mail_password=null mail_encryption=null i've tried password ", ' , without, restarting server every time. i've tried changing localhost 172.0.0.1. yes, password correct, running mysql -u root -p introducing password root in prompt can go mysql. users table: +------------------+-----------+ | user | host | +------------------+-----------+ | debian-sys-maint | localhost | | mysql.sys | localhost | | root | localhost | | root1 | localhost | +------------------+-----------+ i've added homestead.yaml this: database_port: 3306 ...
Read more