Struts2 File Upload

Upload a file in two steps:

1. Page

<Form action = "addhomead.htm" method = "Post" onsubmit = "Return checkform ()" enctype ="Multipart/form-Data"Name =" form1 "id =" form1 ">
<Table width = "600" border = "1">

 

<Tr>
<TD> upload an image </TD>
<TD> <label>
<Input type = "file" name = "IMG" id = "IMG" onkeydown = "event. returnvalue = false;"/>
</Label> </TD>
</Tr>

<Tr>
<TD> & nbsp; </TD>
<TD> <label>
<Input type = "Submit" name = "bunupload" id = "bunupload" value = "Submit"/>
</Label> </TD>
</Tr>
</Table>
</Form>

 

2. Action

Public class addhomead extends actionsupport {
 
Private ihomeadserver homeadserver;
Private file IMG;
Private string imgfilename;
Private string imgcontenttype;
Private string URL;
Private string ALT;
Private integer priority;
Private string basedir;
Private string dir; // The generated dir
Private string userupload = "userupload ";
Private string ImagePath;
 

@ Override
Public String execute () throws exception {
String newfilename;
String dirtime;
Try {
// System. Out. println ("file length:" + IMG. Length ());
Basedir = servletactioncontext. getservletcontext (). getrealpath (userupload );
Dirtime = uploadfile. gettimebyformat ("yyyymm ");
Dir = basedir + "//" + dirtime;
If (! (New file (DIR). isdirectory () {// if this folder is not saved, create it
New file (DIR). mkdir ();
}
Newfilename = uploadfile. getnewfilename (imgfilename); // you can specify a file name.
String saveimagepath = dir + "//" + newfilename;
Uploadfile. Copy (IMG, saveimagepath); // save file parameter 1 file parameter 2 file in the absolute save path

} Catch (exception ex ){
Ex. printstacktrace ();
Uploadfile. outmessage ("unable to upload images ");
Return success; // if the file cannot be uploaded, the system returns
}
String ImagePath = userupload + "/" + dirtime + "/" + newfilename;

Homead = new homead ();
Homead. setalt (ALT );
Homead. seturl (URL );
Homead. setimg (ImagePath );
Homead. setimgtime (uploadfile. getnowdatetime (); // return the current system time
Homead. setpriority (priority );
Homeadserver. addhomead (homead );
Uploadfile. outmessage ("image uploaded successfully! ");
Return success;
}

 

 

Private Static final int buffer_size = 16*1024;
// A self-encapsulated object that copies the source object to the target object
Public static void copy (File oldfile, string filepath ){
Try {
File newfile = new file (filepath );
Inputstream in = NULL;
Outputstream out = NULL;
Try {
In = new bufferedinputstream (New fileinputstream (oldfile), buffer_size );
Out = new bufferedoutputstream (New fileoutputstream (newfile ),
Buffer_size );
Byte [] buffer = new byte [buffer_size];
Int Len = 0;
While (LEN = in. Read (buffer)> 0 ){
Out. Write (buffer, 0, Len );
}
} Catch (exception e ){
E. printstacktrace ();
} Finally {
If (null! = In ){
Try {
In. Close ();
} Catch (ioexception e ){
E. printstacktrace ();
}
}
If (null! = Out ){
Try {
Out. Close ();
} Catch (ioexception e ){
E. printstacktrace ();
}
}
}
} Catch (exception ex ){
System. Out. println ("file cannot be created" + ex. tostring ());
}

}

 

// Create a new file name
Public static string getnewfilename (string filename ){
Java. util. Date = new java. util. Date (system. currenttimemillis ());
// Format the time
Java. Text. simpledateformat SDF = new java. Text. simpledateformat ("yyyymmdd_hhmmss ");
String S = SDF. Format (date );
Random ran = new random ();
S + = "_" + ran. nextint (10000 );

Int I = filename. lastindexof (".");
System. Out. println (I );
String STR = "";
If (I <0)
STR = filename;
Else
STR = filename. substring (I, filename. Length ());
S + = STR;
Return S;
}
 
 
// Output information and direct it to the specified address. js implementation
Public static void outmessage (string message)
{
Try
{
Httpservletresponse response = servletactioncontext. getresponse ();
Response. setcontenttype ("text/html; charset = UTF-8 ");
Response. setheader ("cache-control", "No-Cache ");

Printwriter out = response. getwriter ();
Stringbuffer buffer = new stringbuffer ();
Buffer. append ("<SCRIPT type =/" text/JavaScript/"> ");
Buffer. append ("alert ('" + message + "');");
// Buffer. append ("window. navigate (/" "+ newurl + "/");");
Buffer. append ("history. Go (-1 );");
Buffer. append ("</SCRIPT> ");
String S = buffer. tostring ();
Out. println (s );
Out. Flush ();
Out. Close ();

} Catch (exception ex)
{
System. Out. println (ex. tostring ());
}
}

// Returns the Time of the string type.
Public static string gettimebyformat (string format ){
Try {
Java. util. Date = new java. util. Date (system. currenttimemillis ());
// Format the time
Java. Text. simpledateformat SDF = new java. Text. simpledateformat (format );
String S = SDF. Format (date );
Return S;
} Catch (exception ex ){
System. Out. println ("format error:" + ex. tostring ());
}
Return NULL;

}
 
// Return the current system time. It is applicable to the hibernate datetime field.
Public static timestamp getnowdatetime (){
Date = new date ();
Timestamp nousedate = new timestamp (date. gettime ());
Return nousedate;
}

}