Package fileinsockettraslation;
/*
* The Helper port used in this class is initially set to 10000. If the binding fails, try another port.
* The trybindtimes table is used to identify the number of bindings. If the Help fails, it will be added.
* The current help port is determined by defaultbindport + trybindtimes.
* The external system (the object that calls this program) can obtain the current helper port.
* Notify the client service port so that it can be correctly connected to the port.
*/ Import java.net .*;
Import java. Io .*; Import javax. Swing. jfilechooser;
Import javax. Swing. joptionpane;
Public class GetFile extends thread { Serversocket sersocket; // The service socket waits for the peer connection and file sending.
Socket tempsocket; // The socket generated by the Service socket
Inputstream insocket; // used for reading
Randomaccessfile infile = NULL; // random File Access
Byte bytebuffer [] = new byte [1024]; // temporary easing Area
Int defaultbindport = 10000; // port 10000 is used by default to listen for requests.
Int trybindtimes = 0; // the initial number of ports bound is 0.
Int currentbindport = defaultbindport + trybindtimes; // The currently bound port number is the default port 10000.
Private void bindtoserverport () throws exception // The exception is thrown because the service port cannot be bound.
{
Try {
System. Out. println ("try to bind the port number:" + this. currentbindport); // output the bound port number to the current console.
Sersocket = new serversocket (this. currentbindport); // open a service socket on your machine and wait for the sender to connect
} Catch (exception e ){
E. printstacktrace ();
System. Out. println (E. tostring (); // retry if the binding fails.
This. trybindtimes = This. trybindtimes + 1; // you have tried gettrybindedtimes more than once.
This. currentbindport = This. defaultbindport + this. trybindtimes ;//
If (this. trybindtimes> = 20)
{
Throw new exception ("cannot be bound to the specified port" + '\ n' + "tried too many times! ");
// Exit if the number of attempts exceeds 20
}
This. bindtoserverport (); // recursive binding
}
System. Out. println ("successfully bound port:" + this. currentbindport); // output the bound port number to the current console.
}
Public int gettrybindedtimes ()
{
Return this. trybindtimes;
}
Public int getcurrentbindingport ()
{
Return this. currentbindport;
}
************************** *******************
Public static void main (string ARGs []) {
GetFile gf = NULL;
Try {
GF = new getfiles (10000 );
} Catch (exception e ){
E. printstacktrace ();
System. Out. println ("file cannot be transferred! ");
System. Exit (1 );
}
GF. Start ();
}
************************** ******************* Public GetFile (INT port) throws exception // The exception is thrown because the service port cannot be bound.
{
Try {
This. bindtoserverport (); // bind the service port
} Catch (exception e ){
E. printstacktrace ();
System. Out. println (E. tostring (); // retry if the binding fails.
Throw new exception ("port binding failed! ");
}
Jfilechooser jfc = new jfilechooser ("."); // The file selector is opened in the current directory.
Jfc. showsavedialog (New javax. Swing. jframe ());
File savedfile = jfc. getselectedfile (); // obtain the current selected file reference
If (savedfile! = NULL) // select a file
{
Infile = new randomaccessfile (savedfile, "RW"); // the random access file used to read data can read data in blocks each time.
}
}
Public void run (){
Try {
If (this. infile = NULL)
{
System. Out. println ("no file selected ");
This. sersocket. Close (); // close the service provider socket
Return; // No file selected
}
System. Out. println ("wait for..." + '\ n' + "waiting for peer access ");
Tempsocket = sersocket. Accept (); // wait for the peer connection
This. sersocket. setsotimeout (5000); // an exception will be thrown if the connection fails for five seconds.
This. insocket = tempsocket. getinputstream (); // gets the input stream
} Catch (exception ex ){
System. Out. println (ex. tostring ());
Ex. printstacktrace ();
Return;
}
Int amount; // The following is the file transfer code and stream socket cleanup.
Try {
While (amount = insocket. Read (bytebuffer ))! =-1 ){
Infile. Write (bytebuffer, 0, amount );
}
Insocket. Close (); // close the stream
Javax. Swing. joptionpane. showmessagedialog (New javax. Swing. jframe (), "received successfully", "prompt! ",
Javax. Swing. joptionpane. plain_message );
System. Out. println ("Get OK ");
System. Out. println ("received! ");
Infile. Close (); // close the file
Tempsocket. Close (); // close the temporary socket
This. sersocket. Close (); // close the service provider socket
} Catch (ioexception e ){
System. Out. println (E. tostring ());
E. printstacktrace ();
}
}
} Package fileinsockettraslation; Import java.net .*;
Import java. Io .*;
/* When the server is enabled
* Instantiate a socket
* And send the file
*
*
**/
Import javax. Swing. jfilechooser;
Public class sendfile extends thread {
String remoteipstring = NULL; // Remote String
Int port; // remote service port
Socket tempsocket; // temporary socket
Outputstream outsocket; // output stream used to send files
Randomaccessfile OUTFILE; // file to be sent
Byte bytebuffer [] = new byte [1024]; // temporary cache for sending files
**************************** ****************************
Public static void main (string ARGs []) {
Sendfile Sf = new sendfile ("127.0.0.1", 10000 );
SF. Start ();
}
**************************** **************************** Public sendfile (string remoteipstring, int port) {// The constructor is only used to select the location of the file to be sent and receive remote addresses and ports from outside
Try {
This. remoteipstring = remoteipstring;
This. Port = port;
// % Select the file location to be sent % %
Jfilechooser jfc = new jfilechooser (".");
File file = NULL;
Int returnval = jfc. showopendialog (New javax. Swing. jframe ());
If (returnval = jfilechooser. approve_option)
{
File = jfc. getselectedfile ();
}
// % %
OUTFILE = new randomaccessfile (file, "R ");
} Catch (exception e ){}
}
Public void run (){
Try {
// The prerequisite is that the server must be enabled first.
This. tempsocket = new socket (this. remoteipstring, this. Port );
System. Out. println ("successfully connected to the server ");
Outsocket = tempsocket. getoutputstream ();
Int amount;
System. Out. println ("start sending files ");
While (amount = OUTFILE. Read (bytebuffer ))! =-1 ){
Outsocket. Write (bytebuffer, 0, amount );
}
System. Out. println ("Send File complete ");
Javax. Swing. joptionpane. showmessagedialog (New javax. Swing. jframe (), "sent", "prompt! ",
Javax. Swing. joptionpane. plain_message );
OUTFILE. Close ();
Tempsocket. Close ();
} Catch (ioexception e ){
System. Out. println (E. tostring ());
E. printstacktrace ();
}
}
} |
