Jsp file Upload simple instance sharing

Last Update:2017-01-13 Source: Internet

Author: User

Tags file upload

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(I) form requirements

There are two requirements for the form for uploading files:

1. Apply post to method, that is, method = "post ".

2. Add attributes: enctype = "multipart/form-data"

The following is an example of a form used to upload files:

(Ii) upload example

1、upload page upload.html

This page provides a form that allows you to select the file to be uploaded and click "upload" to upload the file.

The page source code is as follows:

<! --
File name: upload.html
Author: Landscape Software Production Center Yu Yiqi (zhsoft88@sohu.com)
-->
<! Doctype html public "-// w3c // dtd html 4.01 transitional // en">
<Html>
<Head>
<Title> File upload </title>
<Meta http-equiv = "content-type" content = "text/html; charset = gb2312">
</Head>

<Body>
<P> </p>
<P align = "center"> select an upload file </p>
<Form method = "post" action = "jsp/do_upload.jsp"
Enctype = "multipart/form-data">
<Input type = "hidden" name = "test" value = "good">
<Table width = "75%" border = "1" align = "center">
<Tr>
<Td> <div align = "center"> 1,
<Input type = "file" name = "file1" size = "30">
</Div> </td>
</Tr>
<Tr>
<Td> <div align = "center"> 2,
<Input type = "file" name = "file2" size = "30">
</Div> </td>
</Tr>
<Tr>
<Td> <div align = "center"> 3,
<Input type = "file" name = "file3" size = "30">
</Div> </td>
</Tr>
<Tr>
<Td> <div align = "center"> 4,
<Input type = "file" name = "file4" size = "30">
</Div> </td>
</Tr>
<Tr>
<Td> <div align = "center">
<Input type = "submit" name = "submit" value = "upload it! ">
</Div> </td>
</Tr>
</Table>
</Form>
</Body>
</Html>

2. Upload processing page do_upload.jsp

Upload files on this page. The page source code details the usage of the upload method, which will not be repeated here.

The page source code is as follows:

<% --
File name: do_upload.jsp
Author: Landscape Software Production Center Yu Yiqi (zhsoft88@sohu.com)
-- %>
<% @ Page contenttype = "text/html; charset = gb2312" language = "java"
Import = "java. util. *, com. jsps tutorial mart. upload. *" errorpage = "" %>
<Html>
<Head>
<Title> File upload processing page </title>
<Meta http-equiv = "content-type" content = "text/html; charset = gb2312">
</Head>

<Body>
<%
// Create a new smartupload object
Smartupload su = new smartupload ();
// Upload initialization
Su. initialize (pagecontext );
// Set Upload restrictions
// 1. Limit the maximum length of each uploaded file.
// Su. setmaxfilesize (10000 );
// 2. Restrict the total length of uploaded data.
// Su. settotalmaxfilesize (20000 );
// 3. Set the files that can be uploaded (with the extension limit). Only the doc and txt files are allowed.
// Su. setallowedfileslist ("doc, txt ");
// 4. Set files that are not allowed to be uploaded (by using the extension limit). Upload with exe, bat, is prohibited,
Jsp, htm, html extension files and files without extension.
// Su. setdeniedfileslist ("exe, bat, jsp, htm, html ,,");
// Upload a file
Su. upload ();
// Save all uploaded files to the specified directory
Int count = su. save ("/upload ");
Out. println (count + "files uploaded successfully! <Br> ");

// Obtain the parameter value using the request object
Out. println ("test =" + su. getrequest (). getparameter ("test ")
+ "<Br> ");

// Extract the uploaded file information one by one and save the file.
For (int I = 0; I <su. getfiles (). getcount (); I ++)
{
Com. jspsmart. upload. file = su. getfiles (). getfile (I );

// Continue if the object does not exist
If (file. ismissing () continue;

// Display the current file information
Out. println ("<table border = 1> ");
Out. println ("<tr> <td> form item name (fieldname) </td> <td>"
+ File. getfieldname () + "</td> </tr> ");
Out. println ("<tr> <td> File size </td> <td>" +
File. getsize () + "</td> </tr> ");
Out. println ("<tr> <td> file name (filename) </td> <td>"
+ File. getfilename () + "</td> </tr> ");
Out. println ("<tr> <td> File extension (fileext) </td> <td>"
+ File. getfileext () + "</td> </tr> ");
Out. println ("<tr> <td> File full name (filepathname) </td> <td>"
+ File. getfilepathname () + "</td> </tr> ");
Out. println ("</table> <br> ");

// Save the file
// File. saveas ("/upload/" + myfile. getfilename ());
// Save it to the directory where the root directory of the web application is the root directory of the file.
// File. saveas ("/upload/" + myfile. getfilename (),
Su. save_virtual );
// Save the file to the root directory of the operating system
// File. saveas ("c: temp" + myfile. getfilename (),
Su. save_physical );

}
%>
</Body>
</Html>

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