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Http://www.zdnet.com.cn/developer/code/story/0,2000081534,39312959,00.htm

Package com. Startech. fjtbcj. down;

Import java. Io .*;

Import java. util .*;

Import sun. Misc. base64decoder;

Public class exchangefile {

/**????????????

@ Param filename ?????????? (E.g. "D: \ 1.txt ")

@ Param applybean ????????? Arraylist

*/

Public void transfertotxtfile (string filename, arraylist applybean)

Throws ioexception {

Char token = '$ ';

Stringbuffer sb = new stringbuffer ();

Bufferedwriter writer =

New bufferedwriter (

New outputstreamwriter (New fileoutputstream (filename )));

Userinfo [] userinfoarray = new userinfo [applybean. Size ()];

For (INT I = 0; I <applybean. Size (); I ++ ){

Userinfoarray [I] = (userinfo) applybean. Get (I );

SB. append (base64.getbase64 (userinfoarray [I]. getpic ()));

SB. append (token );

Writer. Write (sb. tostring ());

Writer. newline ();

Writer. Flush ();

SB. Delete (0, SB. Length ());

}

Writer. Close ();

}

/**???????????

@ Param filename ?????????

@ Return arraylist ????????? Arraylist

*/

Public arraylist getfromtxtfile (string filename) throws ioexception {

Bufferedreader reader = NULL;

Arraylist Al = new arraylist ();

Try {

Reader =

New bufferedreader (

New inputstreamreader (New fileinputstream (filename )));

String STR = NULL;

Stringtokenizer token;

Arraylist tokenlist = new arraylist ();

Al = new arraylist ();

While (STR = reader. Readline ())! = NULL ){

Token = new stringtokenizer (STR, "$", false );

While (token. hasmoretokens ()){

String temptoken = token. nexttoken ();

Tokenlist. Add (temptoken );

}

Userinfo user = new userinfo ();

User. setpic (base64.getfrombase64 (string) tokenlist. Get (0 )));

Tokenlist. Clear ();

Al. Add (User );



}

Reader. Close ();

} Catch (exception e) {reader. Close (); E. printstacktrace ();

}

Return al;

}

//????

Public static void main (string [] ARGs) throws ioexception {

System. Out. println ("test 'transfertotxtfile 'input 1 please ");

System. Out. println ("test 'getfromtxtfile 'input 2 please ");

Bufferedreader lineoftext =

New bufferedreader (New inputstreamreader (system. In ));

String textline = lineoftext. Readline ();

If (textline. Equals ("1 ")){

Userinfo user1 = new userinfo ();



Fileinputstream file = new fileinputstream ("C: \ 1.jpg ");

Byte [] filebyte = new byte;

File. Read (filebyte );

File. Close ();

User1.setpic (filebyte );

Arraylist Al = new arraylist ();

Al. Add (user1 );



Exchangefile efile = new exchangefile ();

Efile. transfertotxtfile ("C: \ test1.dat", Al );

Al. Clear ();

}

If (textline. Equals ("2 ")){

Exchangefile efile = new exchangefile ();

Arraylist Al = efile. getfromtxtfile ("C: \ test1.dat ");

For (INT I = 0; I <Al. Size (); I ++ ){



Fileoutputstream file = new fileoutputstream ("d :\\" + I + "1.jpg ");

File. Write (userinfo) Al. Get (I). getpic ());

File. Flush ();

File. Close ();

}

}

}

}

//???

Class base64 {

Public static string getbase64 (byte [] BS ){

If (BS = NULL)

Return NULL;

Return (new sun. Misc. base64encoder (). encode (BS );

}

Public static byte [] getfrombase64 (string Str) throws exception {

If (STR = NULL) return NULL;

Return (new sun. Misc. base64decoder (). decodebuffer (STR );

}

}

Class userinfo {

Private string username;

Private string userage;

Private byte [] PIC;

Public void setusername (string username ){

This. Username = username;

}

Public String GetUserName (){

Return this. Username;

}

Public void setuserage (string age ){

This. userage = age;

}

Public String getuserage (){

Return this. userage;

}

/**

* @ Return

*/

Public byte [] getpic (){

Return PIC;

}

/**

* @ Param BS

*/

Public void setpic (byte [] BS ){

PIC = BS;

}

}