Of Stack

JSP component commons fileupload implements file uploading

  • 2021-10-24 23:25:21
  • OfStack

This article example for everyone to share JSP using commons-fileupload file upload code, for your reference, the specific content is as follows

1. Prepare:

Copy commons-fileupload-1. 1.zip and commons-io-1. 1.zip to the "\ WEB-INF\ lib" directory

2. First, Servlet: FileUpload. java 


package servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

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.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUpload extends HttpServlet {
 
 private String uploadPath="E:\\addnetFile\\";// Directory to upload files to 
 private File tempPath=new File("E:\\tempFile\\");// Directory to store uploaded files 
 
 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 response.setContentType("text/html;charset=GB2312");
 response.setCharacterEncoding("gb2312");
 PrintWriter out=response.getWriter();
 out.println(" The length of the request content is: "+request.getContentLength());
 out.println(" The type of request content is: "+request.getContentType());
 
 DiskFileItemFactory factory=new DiskFileItemFactory();
 factory.setRepository(tempPath);
 factory.setSizeThreshold(4096);
 
 ServletFileUpload upload=new ServletFileUpload(factory);
 upload.setSizeMax(1000000);
 List<?> fileitems=null;
 try{
  fileitems=upload.parseRequest(request);
  Iterator<?> iterator=fileitems.iterator();
  String regex=".+\\\\(.+)$";
  String[] errortype={".exe",".com",".cgi",".asp"};
  Pattern p=Pattern.compile(regex);
  while(iterator.hasNext()){
  FileItem item=(FileItem) iterator.next();
  if(!item.isFormField()){
   String name=item.getName();
   long size=item.getSize();
   if(name==null||name.equals("")&&size==0)
   continue;
   Matcher m=p.matcher(name);
   if(m.find()){
   for(int temp=0;temp<errortype.length;temp++){
    if(m.group(1).endsWith(errortype[temp]))
    throw new IOException(name+":wrong type");
   }
   try{
    item.write(new File(tempPath,m.group(1)));
    out.println(name+" "+size+"<br/>");
    out.println(" Upload succeeded ");
   }catch(Exception e){
    out.println("333"+e);
   } 
   }
   else{
   throw new IOException("fail to upload");
   }
   
  }
  }
 }catch(IOException e){
  out.println("222"+e);
 }
 catch(FileUploadException e1){
  e1.printStackTrace();
  out.println("111"+e1);
 }
 }

 public void init() throws ServletException {
 if(!new File(uploadPath).isDirectory())
  new File(uploadPath).mkdir();
 if(!tempPath.isDirectory())
  tempPath.mkdir();
 }
 
 public void destroy(){
 super.destroy();
 }

}

3, followed by html: Uploadfile. html 


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <title>Uploadfilel.html</title>
 
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="this is my page">
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  
  <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

 </head>
 
 <body>
  <form action="/Firstjsp/servlet/FileUpload" method="post" enctype="multipart/form-data" name="form1">
  <input type="file" name="file"/>
  <input type="submit" name="submit" value="upload"/>
  </form>
  <form action="/Firstjsp/servlet/FileUpload" method="post" enctype="multipart/form-data" name="uploadform">
  <table>
  <tr>
   <td>
    Documents 1 : <input type="file" name="X" size="40"/>
   </td>
  </tr>
  <tr>
   <td>
    Documents 2 : <input type="file" name="Y" size="40"/>
   </td>
  </tr>
  <tr>
   <td>
    Documents 3 : <input type="file" name="Z" size="40"/>
   </td>
  </tr>
  </table>
  <input type="submit" name="upload" value=" Start uploading "/> 
  </form>
 </body>
</html>

4. Finally, configure web. xml 


<servlet>
  <description>This is the description of my J2EE component</description>
  <display-name>This is the display name of my J2EE component</display-name>
  <servlet-name>FileUpload</servlet-name>
  <servlet-class>servlet.FileUpload</servlet-class>
 </servlet>
<servlet-mapping>
  <servlet-name>FileUpload</servlet-name>
  <url-pattern>/servlet/FileUpload</url-pattern>

First, html is run, and servlet processes the upload request

Related articles: