How to upload files in JSP

The procedure is as follows:

Package linkman. helper;

Import java. io .*;

Import java. util .*;

Import javax. servlet. http. HttpServletRequest;

Import javax. servlet. http. HttpServletResponse;

Import javax. servlet. ServletInputStream;

Public class UpLoadBean {

Private String SavePath = null;

Private String FileName = null;

Private String Sperator = null;

Private String ErrMsg = "Normal Return ";

Private byte [] bt = new byte [0, 4096];

Private byte [] prebt = new byte [1, 4096];

Private int t =-1;

Private long FileSize =-1;

Private boolean UserDefineFileName = false;

//////////////////////////////////////// /////////

Public UpLoadBean (){

FileName = bringFileName ();

}

Public UpLoadBean (String savepath ){

SavePath = savepath;

FileName = bringFileName ();

}

//////////////////////////////////////// /////////

// File Name Information

Private String bringFileName (){

Calendar dt = Calendar. getInstance ();

String str = "" + dt. get (Calendar. YEAR) + dt. get (Calendar. MONTH) + dt. get (Calendar. DAY_OF_MONTH );

Str = str + dt. get (Calendar. HOUR) + dt. get (Calendar. MINUTE) + dt. get (Calendar. SECOND );

Return str;

}

Public void setFileName (String filename ){

FileName = filename;

UserDefineFileName = true;

}

Public String getFileName (){

Return FileName;

}

//////////////////////////////////////// /////////

// Upload the file main program

Public boolean UpLoad (HttpServletRequest request) throws Exception {

If (SavePath = null ){

SetErrorMessage ("the path for saving the uploaded file is not set ");

Return false;

}

Request. setCharacterEncoding ("UTF-8 ");

ServletInputStream in = request. getInputStream ();

//////////////////////////////////////// ////

// Obtain the delimiter of a row

T = in. readLine (bt, 0, bt. length );

If (t! =-1 ){

Sperator = new String (bt, 0, t );

Sperator = Sperator. substring (0, 28 );

T =-1;

}

//////////////////////////////////////// ////

// Get the extension and set the full name of the file

Do {

T = in. readLine (bt, 0, bt. length );

String s = new String (bt, 0, t );

Int index = s. indexOf ("filename = "");

If (index! =-1 ){

S = s. substring (index + 10 );

Index = s. indexOf (""");

S = s. substring (0, index );

Index = s. lastIndexOf (".");

If (! UserDefineFileName ){

FileName = FileName + s. substring (index); // you can specify the full name of a file.

}

T =-1;

}

} While (t! =-1 );

//////////////////////////////////////// ////

// Obtain the File Content

FileOutputStream out = new FileOutputStream (SavePath + "" + FileName );

T = in. readLine (bt, 0, bt. length );

String s = new String (bt, 0, t );

Int I = s. indexOf ("Content-Type :");

If (I =-1 ){

SetErrorMessage ("uploaded is not a file ");

Return false;

} Else {

In. readLine (bt, 0, bt. length); // remove an empty row.

T =-1;

}

Boolean state = true;

Long trancsize = 0;

Try {

T = in. readLine (bt, 0, bt. length );

While (t! =-1 ){

S = new String (bt, 0, t );

If (s. length ()> 28 ){

S = s. substring (0, 28 );

If (s. equals (Sperator )){

Break;

}

}

/*

If (bt [0] ==45 & bt [1] ==45 & bt [2] ==45 & bt [3] ==45 & bt [4] = 45) {

Break;

}

*/

If (FileSize! =-1 ){

If (trancsize> = FileSize ){

Throw new Exception ("uploading files too large ");

}

}

Out. write (bt, 0, t );

Trancsize + = t;

T = in. readLine (bt, 0, bt. length );

}

} Catch (Exception e ){

State = false;

Out. close ();

SetErrorMessage (e. getMessage ());

File tmp = new File (SavePath, FileName );

If (! Tmp. delete ()){

SetErrorMessage (e. getMessage () + ", clear unfinished ");

}

} Finally {

If (state ){

Out. close ();

}

Return state;

}

}

//////////////////////////////////////// /////////

// Upload File error message

Public void setErrorMessage (String errormessage ){

ErrMsg = errormessage;

}

Public String getErrorMessage (){

Return ErrMsg;

}

//////////////////////////////////////// /////////

// File size information

Public void setFileSize (long size ){

FileSize = size;

}

Public long getFileSize (){

Return FileSize;

}

} // End class