Java component Commons-fileupload Implementation file upload, download, open online _java

Recently made a file upload, download, and online Open the function of the file, just began to upload the file interface contains other forms (such as input boxes, passwords, etc.) in the upload process encountered a lot of problems, I wrote a file upload, download, open the file online test procedures.

First, look at the effect chart:

Core code:

Package Com.jefry; 
Import Java.io.File; 
Import Java.io.FileInputStream; 
Import java.io.IOException; 
Import Java.net.URL; 
Import java.util.ArrayList; 
Import Java.util.Iterator; 
 
Import java.util.List; 
Import javax.servlet.ServletException; 
Import Javax.servlet.ServletOutputStream; 
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;  /** * Servlet Implementation class FileUpload/public class FileUpload extends HttpServlet {private static final 
 Long serialversionuid = 1L; 
 private static final String Filedir = "f:/"; 
 /** * Default constructor. */Public FileUpload () {} protected void doget (HttpServletRequest request, httpservletresponse response) th Rows Servletexception, IOException {String afilename = Request.getparameter ("FileName"); 
 String online = request.getparameter ("online"); 
 FileInputStream in = null; 
 Servletoutputstream out = null; Boolean isonline = online!= null? 
 True:false; 
  try {if (isonline) {URL u = new URL ("file:///" +filedir + afilename); 
  Response.setcontenttype (U.openconnection (). getContentType ()); Response.setheader ("content-disposition", "inline; 
  Filename= "+afilename); 
  } else{Response.setcontenttype ("Application/x-msdownload"); Response.setheader ("Content-disposition", "attachment; 
  Filename= "+ afilename); 
  in = new FileInputStream (Filedir + afilename); 
  out = Response.getoutputstream (); 
  Out.flush (); 
  int aread = 0; 
  while ((Aread = In.read ())!=-1 & in!= null) {out.write (aread); 
  
 } out.flush (); 
 catch (Throwable e) {e.printstacktrace (); 
  Finally {try {in.close (); 
  Out.close (); 
  catch (Throwable e) {e.printstacktrace (); 
 } 
 }
 } protected void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, Ioexce 
  ption {try {diskfileitemfactory filefactory = new Diskfileitemfactory (); 
  Servletfileupload fu = new Servletfileupload (filefactory); 
  List Fileitems = fu.parserequest (request); 
  Iterator iter = Fileitems.iterator (); 
  String uploader = null; 
  String date = null; 
  list<string> fileNames = new arraylist<string> (); 
  while (Iter.hasnext ()) {Fileitem item = (Fileitem) iter.next (); 
   if (!item.isformfield ()) {//file String Oldfilename = Item.getname (); 
   String newfilename = null; 
   int delimiter = Oldfilename.lastindexof ("/"); 
   if (delimiter = = 1) newfilename = oldfilename.substring (delimiter + 1); 
   else NewFileName = Oldfilename; 
   Filenames.add (NewFileName); 
  Item.write (New File (Filedir + newfilename)); 
   else {//form String fieldName = Item.getfieldname (); 
if ("Uploader". Equals (FieldName)) {   uploader = item.getstring (); 
   else if ("date". Equals (FieldName)) {date = item.getstring (); 
  }} request.setattribute ("FileNames", fileNames); 
 Request.getrequestdispatcher ("download.jsp"). Forward (request, response); 
 The catch (Exception e) {}}}

index.jsp

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 " 
 pageencoding=" UTF-8 "%> 
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" > 
 
 

download.jsp

<%@ page language= "java" contenttype= "text/html; Charset=utf-8 "pageencoding=" UTF-8 "%> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" > <% @page impo Rt= "Java.util.List"%> 

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