Set the response type at the front end when downloading: Response. setcontenttype ("application/X-download ");
OS = response. getoutputstream ();
Is = new fileinputstream (new file (PATH ));
Set the frontend type when uploading: Response. setcontenttype ("text/html; charset = gb2312 ");
Fileoutputstream Fos = new fileoutputstream (tempfile + filepath + "\" + filename );
FOS. Write (fileitem. Get ());
Garbled conversion:
Encodefilter class implements the filter interface under the servlet package
In the dofilter method:
Request. setcharacterencoding ("UTF-8"); // transfers requests in UTF-8 form
Chain. dofilter (request, response); // allow requests
In action:
Uploadform = (uploadform) form;
Formfile photo = uploadform. getphoto (); // formfile is the file type defined in formbean.
Oracle functions:
Nvl (A, B): If a is notNullReturns a; otherwise, returns B.
Nvl (a, B, c): If a is notNullB is returned; otherwise, C is returned.
Decode (value, if1, then1, if2, then2, if3, then3 ,..., Else) indicates that if value is equal to if1, the result is then1...
Select instr ("yuechaotianyuechao", "Ao",-) position from dual; (-1 is the start position, 1 is the number of times)-17
Substr ("ABCDE",-6, 5) = NULL-6 is the string length starting from 6th to the left. 5 is the string length.
Substr ("ABCDE",-6th) = ABCDE-6 indicates that the string length is obtained from locations to the left.
MoD (A, B): remainder of A and B
Row_number () over (partition... Order ...)
Uploadform = (uploadform) form;
Formfile photo = uploadform. getphoto ();
Response. setcontenttype ("text/html; charset = UTF-8"); // set the output content format
String filename = photo. getfilename ();
Inputstream contentstream = photo. getinputstream ();
String savedir = This. getservlet (). getservletcontext (). getrealpath ("/");
File filephoto = new file (savedir, filename );
Fileoutputstream Fos = new fileoutputstream (filephoto );
/**
Int Len = 0;
Byte [] Buf = new byte [1024]; // create a 1024-byte array
While (LEN = contentstream. Read (BUF ))! =-1) // if you read the content
{
FOS. Write (BUF, 0, Len); // output the read subscript from 0 to Len length to the file output stream.
}
*/
FOS. Write (uploadform. getphoto (). getfiledata (); // replace the above rows
Contentstream. Close (); // close the stream
FOS. Close (); // close the stream
Step 1: Compile the page file
<% @ Page Language ="Java"Pageencoding =" UTF-8 "%>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<% @ Includefile = "/header. jsp" %>
<Title>StrutsUpload a file </title>
</Head>
<Body>
<H2> UseStrutsUpload a file </H2>
<HR/>
<Form. Action = "<% = basepath %>Strutsfileupload. do? Method = upload"Method ="Post"
Enctype ="Multipart/form-Data">
<Table>
<Tr>
<TD> select the file to be uploaded </TD>
<TD>
<Input type ="File"Name =" filepath "size =" 20 "/> <br/>
</TD>
</Tr>
<Tr>
<TD>
<Input type = "Submit" value = "Upload"/>
</TD>
<TD>
<A href = "<% = basepath %> strutsfileupload. do? Method = download & Path = fileload/xxxx.txt "> I want to download </a>
</TD>
</Tr>
</Table>
</Form>
</Body>
</Html>
Step 2:Struts-Config. xml file, including form-bean and action configuration
<? XML version = "1.0" encoding = "UTF-8"?>
<! DoctypeStruts-Config public "-// Apache Software Foundation // DTD
StrutsConfiguration 1.2 // en "" http ://Struts.Apache.org/dtds/Struts-Config_1_2.dtd ">
<Data-sources/>
<Form-beans>
<Form-bean name = "fileuploadform"
Type = "com. xinglongjian.Struts. Fileupload. fileuploadform "/>
</Form-beans>
<Global-exceptions/>
<Global-forwards>
<Forward name = "error" Path = "/error/syserror. jsp"> </forward>
</Global-forwards>
<Action-mappings>
<Action Path = "/strutsfileupload" parameter = "method" name = "fileuploadform"
Type = "com. xinglongjian.Struts. Fileupload. fileuploadaction ">
<Forward name = "success" Path = "/Struts/Success. jsp "> </forward>
</Action>
</Action-mappings>
</Struts-Config>
Step 3: fileuploadform. Java
Public class fileuploadform. extends actionform
{
Private formfile filepath; // The type is formfile. The variable filepath is the same as the file name on the page.
Public formfile getfilepath ()
{
Return filepath;
}
Public void setfilepath (formfile filepath)
{
This. filepath = filepath;
}
}
Step 4: fileuploadaction. Java
Public class fileuploadaction extends dispatchaction
{
/**
* Upload a file
* @ Param Mapping
* @ Param form
* @ Param request
* @ Param response
* @ Return
* @ Throws exception
*/
Public actionforward upload (actionmapping mapping, actionform. Form, httpservletrequest request, httpservletresponse response) throws exception
{
Fileuploadform. fileform = (fileuploadform) form;
Formfile file = fileform. getfilepath ();
String realpath = This. getservlet (). getservletcontext (). getrealpath ("/fileload ");
If (file = NULL)
Return Mapping. findforward ("error ");
String filename = file. getfilename ();
Int size = file. getfilesize ();
If (size> 1024*1024)
Return Mapping. findforward ("error ");
Inputstream is = NULL;
Bufferedoutputstream BS = NULL;
Try
{
// Get a inputstream object form. uploadfile
Is = file. getinputstream ();
BS = new bufferedoutputstream (New fileoutputstream (realpath + "/" + filename ));
Byte [] buffer = new byte [20480];
Int COUNT = 0;
While (COUNT = is. Read ())! =-1)
BS. Write (buffer, 0, count );
}
Catch (exception E)
{
E. printstacktrace ();
}
Finally
{
BS. Flush ();
BS. Close ();
Is. Close ();
}
Return Mapping. findforward ("success ");
}
/**
* Download an object
* @ Param Mapping
* @ Param form
* @ Param request
* @ Param response
* @ Return
* @ Throws exception
*/
Public actionforward download (actionmapping mapping, actionform. Form, httpservletrequest request, httpservletresponse response) throws exception
{
String Path = request. getparameter ("path ");
String realpath = This. getservlet (). getservletcontext (). getrealpath ("/" + path );
File uploadfile = new file (realpath );
Inputstream is = new fileinputstream (uploadfile );
Outputstream S = response. getoutputstream ();
Bufferedinputstream Bis = new bufferedinputstream (is );
Bufferedoutputstream Bos = new bufferedoutputstream (OS );
//Code
Response. setheader ("content-disposition", "attachment; filename =" + urlencoder. encode (path, "UTF-8 "));
Int bytesread = 0;
Byte [] buffer = new byte [8192];
While (bytesread = bis. Read (buffer, 0, 8192 ))! =-1)
Bos. Write (buffer, 0, bytesread );
Bos. Close ();
Is. Close ();
Bis. Close ();
OS. Close ();
Return NULL;
}
}
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