Bi Xiangdong _java Basic Video tutorial 19th day _io Stream (20~22)

19th Day -20-io Stream (change standard input)

static void SetIn (InputStream in) reassigns the "standard" input stream.

Static void SetOut (PrintStream out) reassigns the ' standard ' output stream.

 PackageBxD;ImportJava.io.*; Public classTransStreamDemo3 { Public Static voidMain (string[] args)throwsIOException {//not commonly usedSystem.setin (NewFileInputStream ("S.txt")); System.setout (NewPrintStream ("OUT.txt")); BufferedReader BUFR=NewBufferedReader (NewInputStreamReader (system.in)); BufferedWriter BUFW=NewBufferedWriter (NewOutputStreamWriter (System.out));        String Line;  while(line = Bufr.readline ())! =NULL) {            if("EOF". Equals (line)) Break;            Bufw.write (line);            Bufw.newline ();        Bufw.flush ();        } bufr.close ();    Bufw.close (); }}

19th Day -21-io Stream (Exception Log information)

void Printstacktrace (PrintStream s) Prints this throwable and its backtrace to the specified print stream.

 PackageBxD;ImportJava.io.PrintStream;ImportJava.text.SimpleDateFormat;Importjava.util.Date; Public classExceptioninfo { Public Static voidMain (string[] args) {Try {            //Array out-of- bounds access            int[] Array =New int[2]; System.out.println (array[3]); } Catch(Exception e) {printstream PrintStream=NULL; String Time=NewSimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"). Format (NewDate ()); Try{PrintStream=NewPrintStream ("ExceptionInfo.txt");                Printstream.println (time); //Printstream.write (Time.getbytes ());}Catch(Exception ex) {Throw NewRuntimeException ("Log file creation failed");        } e.printstacktrace (PrintStream); }   //log4j is used in the actual project.    }}

19th Day -22-io Stream (printing system Information)

static Properties getProperties () determines the current System Properties.

 package   BxD;  import   java.io.IOException;  import   Java.io.PrintStream;  import   java.util.Properties;  public  class   SystemInfo { public  static  void  main (string[] args)  Throws   IOException {Properties prop  = Syst        Em.getproperties (); Prop.list ( new  printstream ("Sysinfo.txt"     )); }}

Bi Xiangdong _java Basic Video tutorial 19th day _io Stream (20~22)