Apache fileupload background processing method

Package com. servlet;

Import java. io. IOException;
Import java. io. PrintWriter;
Import java. util. HashMap;
Import java. util. Iterator;
Import java. util. List;
Import java. util. Map;
Import javax. servlet. ServletConfig;
Import javax. servlet. ServletException;
Import javax. servlet. http. HttpServlet;
Import javax. servlet. http. HttpServletRequest;
Import javax. servlet. http. HttpServletResponse;

Import org. apache. commons. fileupload. FileItem;
Import org. apache. commons. fileupload. disk. DiskFileItemFactory;
Import org. apache. commons. fileupload. servlet. ServletFileUpload;
Import org. jivesoftware. openfire. plugin. db. DbManager;
/*************************************** ***************************
** File name: Up. java
** Copyright (c) 2007-2011 dhdu@qq.com
** Creator: dhdu@qq.com
** Date:
** Modifier:
** Date:
** Description: upload Servlet
** Jsp page <form action = "u" method = "post" enctype = "multipart/form-data">
** Version:
**
** ===================================================== ======================================
**
** Modify records
**
** Version number modifier modification date modification description
** ===================================================== =====
* 0001
* 0002
**
**************************************** ****************************/
Public class Up extends HttpServlet {
Private static final long serialVersionUID = 1L;
Public void init (ServletConfig config) throws ServletException {
Super. init (config );
}
Public void destroy (){
Super. destroy ();
}
Private void up (HttpServletRequest request, HttpServletResponse response)
Throws ServletException, IOException {
Response. setContentType ("text/html; charset = UTF-8 ");
PrintWriter out = response. getWriter ();
String p = "", filename = null;
Map map = new HashMap ();
Byte [] bytes = null;
Try {
// The file size is limited to 10 MB.
Int maxPostSize = 10*1024*1024;
// File factory type
DiskFileItemFactory factory = new DiskFileItemFactory ();
// Factory. setSizeThreshold (4096 );
ServletFileUpload upload = new ServletFileUpload (factory );
// Upload. setHeaderEncoding ("UTF-8 ");
// Upload. setSizeMax (maxPostSize );
List fileItems = upload. parseRequest (request );
If (fileItems! = Null & fileItems. size ()> 0 ){
Iterator iter = fileItems. iterator ();
While (iter. hasNext ()){
FileItem item = (FileItem) iter. next ();
If (item. isFormField ()){
If (! "Submit". equals (item. getFieldName ())){
P = item. getString ("UTF-8 ");
System. out. println (item. getFieldName () + ":" + p );
Map. put (item. getFieldName (), p );
}
} Else {
Bytes = item. get ();
If (bytes. length> 0 ){
Filename = item. getName ();
System. out. println (filename );
// Item. write (new File ("d:/" + filename ));
}
}
}
}
If (bytes! = Null & bytes. length> 0)
DbManager. getInstance (). saveFile (bytes, filename, map );
Out. write ("OK !!! "+ P );
} Catch (Exception e ){
E. printStackTrace ();
Out. write ("Exception !!! ");
} Finally {
}
}
Protected void doGet (HttpServletRequest req, HttpServletResponse resp)
Throws ServletException, IOException {
DoPost (req, resp );
}
Protected void doPost (HttpServletRequest req, HttpServletResponse resp)
Throws ServletException, IOException {
Req. setCharacterEncoding ("UTF-8 ");
Up (req, resp );
}
 
/*
* ------ This is implemented using jsp in the background.
*
* <% DiskFileItemFactory factory = new DiskFileItemFactory ();
* ServletFileUpload upload = new ServletFileUpload (factory); try {List
* Items = upload. parseRequest (request); Iterator itr = items. iterator ();
* While (itr. hasNext () {FileItem item = (FileItem) itr. next (); if
* (Item. isFormField () {System. out. println ("form parameter name:" + item. getFieldName ()
* + ", Form parameter value:" + item. getString ("UTF-8");} else
* {System. out. println ("Size of the uploaded file:" + item. getSize ());
* System. out. println ("Upload file type:" + item. getContentType ());
* System. out. println ("Name of the uploaded File:" + item. getName (); File tempFile = new
* File (item. getName (); File file = new File (request. getRealPath ("/") +
* "Photofiles", tempFile. getName (); item. write (file); String fname =
* Item. getName (); %> <script language = "javascript"> alert ("uploaded successfully! ");
* </Script> <% }}} catch (Exception e) {e. printStackTrace (); %> <script
* Language = "javascript"> alert ("Upload Failed. please upload again! "); </Script> <%}
*/
}