js| upload | upload picture | Thumbnail This example uses the Jspsmart component for uploading, which can be downloaded for free www.jspsmart.com
After the decompression, the jar package is copied to the \web-inf\lib directory to restart the server, Jspsmart can be used normally
1, uploadimage.jsp
<%@ page contenttype= "text/html;charset=gb2312" language= "java" import= "Java.io.*,java.awt.image,java.awt.image" . *,com.sun.image.codec.jpeg.*,
Java.sql.*,com.jspsmart.upload.*,java.util.*,cn.oof.database.*,cn.oof.house.* "%>
<%
Smartupload mysmartupload =new smartupload ();
Long file_size_max=4000000;
String filename2= "", ext= "", testvar= "";
String url= "uploadfile/images/"; Should be guaranteed to have this directory presence in the root directory
Class
Mysmartupload.initialize (PageContext);
Only allow this type of file to be uploaded
try {
Mysmartupload.setallowedfileslist ("Jpg,gif");
Uploading files
Mysmartupload.upload ();
catch (Exception e) {
%>
<script language=javascript>
Alert ("Only allow uploading of. jpg and. gif type picture files");
window.location= ' upfile.jsp ';
</script>
<%
}
try{
Com.jspsmart.upload.File myFile = Mysmartupload.getfiles (). GetFile (0);
if (myfile.ismissing ()) {%>
<script language=javascript>
Alert ("Please select the file to upload first");
window.location= ' upfile.jsp ';
</script>
<%}
else{
String Myfilename=myfile.getfilename (); Gets the filename of the uploaded file
ext= Myfile.getfileext (); Get suffix Name
int file_size=myfile.getsize (); To get the size of a file
String saveurl= "";
if (File_size<file_size_max) {
Change the file name to get the millisecond value of the current upload time
Calendar calendar = Calendar.getinstance ();
String filename = string.valueof (Calendar.gettimeinmillis ());
Saveurl=request.getrealpath ("/") +url;
Saveurl+=filename+ "." +ext; Save path
Myfile.saveas (saveurl,mysmartupload.save_physical);
Out.print (filename);
-----------------------upload completed, start generating thumbnails-------------------------
Java.io.File File = new Java.io.File (Saveurl); Read the file you just uploaded.
String Newurl=request.getrealpath ("/") +url+filename+ "_min." +ext; New thumbnail Save Address
Image src = javax.imageio.ImageIO.read (file); Constructing an Image Object
float tagsize=200;
int old_w=src.getwidth (NULL); Get Source image width
int old_h=src.getheight (NULL);
int new_w=0;
int new_h=0; Get source Diagram length
int tempsize;
float tempdouble;
if (Old_w>old_h) {
Tempdouble=old_w/tagsize;
}else{
Tempdouble=old_h/tagsize;
}
New_w=math.round (old_w/tempdouble);
New_h=math.round (old_h/tempdouble)//Calculation of the new graph long width
BufferedImage tag = new BufferedImage (NEW_W,NEW_H,BUFFEREDIMAGE.TYPE_INT_RGB);
Tag.getgraphics (). DrawImage (Src,0,0,new_w,new_h,null); Draw a smaller figure
FileOutputStream newimage=new FileOutputStream (Newurl); Output to file stream
JPEGImageEncoder encoder = Jpegcodec.createjpegencoder (newimage);
Encoder.encode (tag); Near-JPEG coding
Newimage.close ();
}
else{
Out.print ("<script language= ' JavaScript ' >");
Out.print ("" Alert (' upload file size cannot exceed "+ (file_size_max/1000) +" K '); ");
Out.print ("window.location= ' upfile.jsp;");
Out.print ("</SCRIPT>");
}
}
}catch (Exception e) {
E.tostring ();
}
%>
2 upload.htm
<title> Please select the uploaded picture </title>
<body>
<table border= "0" align= "center" cellpadding= "0" cellspacing= "0" >
<tr>
<TD height= "align=" center "valign=" middle "><form action=" uploadimage.jsp "method=" POST "enctype=" Multipart/form-data "Name=" Form1 ">
Please select the uploaded picture
<input type= "File" name= "file" >
<input type= "Submit" name= "submit" value= "Upload" >
</form></td>
</tr>
</table>
</body>
