java - How to send command to a usb printer? -


i need open cash drawer cmd. started java (with app) didn't found detailed information classes , how them interact windows ports couldn't working. these method tried(neither errors neither open cash drawer):

public void cashdraweropen()   {      string code1 = "27 112 0 150 250"; //decimal     string code2 = "1b 70 00 96 fa"; //hexadecimal     string code = "escp0û."; //ascii       printservice service = printservicelookup.lookupdefaultprintservice();      system.out.println(service.getname());      docflavor flavor = docflavor.byte_array.autosense;     docprintjob pj = service.createprintjob();      byte[] bytes;      bytes=code2.getbytes();      doc doc=new simpledoc(bytes,flavor,null);       try {         pj.print(doc, null);     } catch (printexception e) {         // todo auto-generated catch block         e.printstacktrace();     } }   public void cashdraweropen2(){     string code1 = "27 112 0 150 250";     string code2 = "1b 70 00 96 fa";     string code = "escp0û.";     fileoutputstream os = null;     try {         os = new fileoutputstream("usb001:pos-58");     } catch (filenotfoundexception e) {         e.printstacktrace();     }       printstream ps = new printstream(os);       ps.print(code1.getbytes());       ps.close(); }

then started testing cmd, following this thread, when execute command 'copy /b open.bat usb001' says: 'overwrite usb001 ? (yes/no/all)'

any idea?

well...the usb001 file must exist in location you're copying , it's asking if want overwrite since you're copying open.bat same usb001 file name.

if want overwrite usb001 file use /y switch well, example: 

copy /b /y open.bat usb001

you can view switches copy @ command prompt entering: 

copy /?

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