Use APACHE-commons-fileupload to write a JSP file to be uploaded

Use APACHE-commons-fileupload to write a JSP file to be uploaded

You need to download the fileupload and beanutils packages. The Code is as follows.

<% @ Page Language = "Java" contenttype = "text/html; charset = gb2312" %>

<% @ Page import = "Java. util. *" %>

<% @ Page import = "Java. Io. *" %>

<% @ Page import = "org. Apache. commons. fileupload. *" %>

<%!
String mkdir (string path ){

String MSG = NULL;
Java. Io. File dir;

// Create a file object
Dir = new java. Io. File (PATH );
If (DIR = NULL ){
MSG = "error cause: <br> sorry, you cannot create an empty directory! ";
Return MSG;
}
If (dir. isfile ()){
MSG = "error cause: <br> an existing file with the same name <B>" + dir. getabsolutepath () + "</B> exists. ";
Return MSG;
}
If (! Dir. exists ()){
Boolean result = dir. mkdirs ();
If (result = false ){
MSG = "error cause: <br> directory <B>" + dir. getabsolutepath () + "</B> creation failed. The cause is unknown! ";
Return MSG;
}
// If the directory is successfully created, no output is displayed.
// MSG = "successfully created Directory: <B>" + dir. getabsolutepath () + "</B> ";
Return MSG;
} Else {
// MSG = "error cause: <br> directory <B>" + dir. getabsolutepath () + "</B> already exists. ";
}
Return MSG;
}
String getcurdate (){
Gregoriancalendar gcdate = new gregoriancalendar ();
Int year = gcdate. Get (gregoriancalendar. year );
Int month = gcdate. Get (gregoriancalendar. month );
Int day = gcdate. Get (gregoriancalendar. day_of_month );
Return "" + year + month + Day;
}
%>
<%
String MSG = "";
String IMG = NULL;

Diskfileupload Fu = new diskfileupload ();
// Set the size of the file to be uploaded. Unit: bytes.
Fu. setsizemax (10000000 );
// Maximum size that will be stored in memory?
// Set up to only data that can be stored in the memory, in bytes
Fu. setsizethreshold (4096 );
// Set the data stored in the hard disk directory when the file size exceeds the value of getsizethreshold ()
Fu. setrepositorypath ("/tmp ");
// Start reading upload information

List fileitems = Fu. parserequest (request );

// process each uploaded file in sequence
iterator iter = fileitems. iterator ();
string updir = "/dbweb/upics/";
string updir2 = "/upics/";
string curdate = getcurdate ();
string filepath = getservletcontext (). getrealpath (updir2) + "/" + curdate; // <--- it seems that there is a problem with getrealpath under Tomcat
string opmsg = mkdir (filepath );
If (opmsg = NULL) {

while (ITER. hasnext () {
fileitem item = (fileitem) ITER. next ();
// ignore all other form information that is not a file field
If (! Item. isformfield () {
string name = item. getname ();
long size = item. getsize ();
If (name = NULL | Name. equals ("") & size = 0)
continue;
// pay attention to item. getname ()
// returns the full path name of the uploaded file on the client. This seems to be a bug.
// to solve this problem, fullfile. getname () is used ().
name = Name. Replace ('\', '/');
file fullfile = new file (name);

File savedfile = new file (filepath, fullfile. getname ());
Item. Write (savedfile );
MSG = " ";
IMG = " ";
}
}
} // Opmsg = NULL
%>

References:
1. Use fileupload to process file uploads
Author: ◇ Liu Dong posting time: 2003.07.09 15:52:43, http://tech.ccidnet.com/pub/disp/Article? Columnid = 322 & ArticleID = 53966 & pageno = 1
Speak very clearly
2. Jakarta commons: Skillful classes and components 1 (2) by Vikram Goyal cactus studio, http://www.uml.org.cn/j2ee/j2eeh2.htm

3, JSP how to achieve web page redirection, 2002-05-16 · BaO luyue · yesky, http://www.yesky.com/SoftChannel/72342371945283584/20020424/1608521.shtml

4, judge whether the file or folder exists, Author: Luo will Tao, http://www.fawcette.com/china/XmlFile.aspx? Id = 205

5. Date class in Java. util, by wing, source: everywhere, http://www.linuxaid.com.cn/articles/1/1/119413536.shtml

6. Computing Java date -- learn how to create and use date, Author: Robert Nielsen, http://www.javaresearch.org/article/showarticle.jsp? Column = 1 & Thread = 497