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Before starting to say a few words, in fact, before the advent of Ajax, Web applications can also be non-refreshing, then mostly through the IFRAME to do this. Of course, after the advent of Ajax, people swarm to the Ajax camp, the IFrame is no more. But it's really a good choice to use an IFrame to upload files without a flush.
Ps:ajax technology can basically be said to be brought up by Google, but less Gmail upload files or iframe, so using an IFrame to upload files is the best choice.
I am here to use the technology is JSP, in fact, asp,php, and so on is the same can be achieved
Html:
<body>
<form action= "/fileuploadservlet" id= "Form1" Name= "Form1" enctype= "Multipart/form-data" method= "POST" target= " Hidden_frame ">
<input type= "File" id= "file" name= "file" style= "width:450" >
<input type= "Submit" value= "Upload file" ><span id= "MSG" ></span>
<br>
<font color= "Red" > Support Jpg,jpeg,gif,bmp,swf,rmvb,rm,avi File Upload </font>
<iframe name= ' hidden_frame ' id= "hidden_frame" style= ' Display:none ' ></iframe>
</form>
</body>
<script type= "Text/javascript" >
function Callback (MSG)
{
document.getElementById ("file"). outerHTML = document.getElementById ("file"). outerHTML;
document.getElementById ("msg"). InnerHTML = "<font color=red>" +msg+ "</font>";
}
</script>
Java Logic Processing:
Package com.partner.servlets;
Import Java.io.BufferedInputStream;
Import Java.io.BufferedOutputStream;
Import Java.io.File;
Import Java.io.FileOutputStream;
Import java.io.IOException;
Import Java.io.PrintWriter;
Import Java.util.Date;
Import Java.util.Iterator;
Import java.util.List;
Import javax.servlet.ServletException;
Import Javax.servlet.http.HttpServlet;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import Org.apache.commons.fileupload.FileItem;
Import org.apache.commons.fileupload.FileUploadException;
Import Org.apache.commons.fileupload.disk.DiskFileItemFactory;
Import Org.apache.commons.fileupload.servlet.ServletFileUpload;
Import Org.apache.commons.fileupload.util.Streams;
Import Org.apache.commons.logging.Log;
Import Org.apache.commons.logging.LogFactory;
Import Com.partner.core.util.UploadConfigurationRead;
public class Fileuploadservlet extends HttpServlet {
Private static final long serialversionuid = 1L;
Protected final transient log log = Logfactory.getlog (Fileuploadservlet.class);
protected void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {
This.dopost (request, response);
}
@SuppressWarnings ("Unchecked")
protected void DoPost (HttpServletRequest request, httpservletresponse response) {
directory where files are stored
File Tempdirpath =new file (Request.getsession (). Getservletcontext (). Getrealpath ("/") +file.separator+ "uploads");
String path = Uploadconfigurationread.getinstance (). Getconfigitem ("TempPath"). Trim ();
File Tempdirpath = new file (path);
if (!tempdirpath.exists ()) {
Tempdirpath.mkdirs ();
}
Create a disk File factory
Diskfileitemfactory FAC = new Diskfileitemfactory ();
Create a servlet file Upload component
Servletfileupload upload = new Servletfileupload (FAC);
Upload.setheaderencoding ("UTF-8");
File list
List fileList = null;
Parse the request to get the file from the foreground.
try {
FileList = upload.parserequest (request);
} catch (Fileuploadexception ex) {
Ex.printstacktrace ();
Return
}
The file name after saving
String imageName = null;
Easy access to the list of files from the front desk
Iterator<fileitem> it = Filelist.iterator ();
while (It.hasnext ()) {
Fileitem item = It.next ();
If it is not a normal form field, treat it as a file field
Bufferedinputstream in = null;
Bufferedoutputstream out = null;
if (!item.isformfield ()) {
ImageName = new Date (). GetTime () + "_" +item.getname ();
try {
in = new Bufferedinputstream (Item.getinputstream ());
out = new Bufferedoutputstream (
New FileOutputStream (New File (Tempdirpath+file.separator+imagename)));
Streams.copy (in, out, true);
} catch (IOException e) {
Log.error ("File Upload exception:", E);
}finally{
if (in = null) {
try {
In.close ();
} catch (IOException e) {
Log.error ("Failed to upload file closed", e);
}
}
if (out! = null) {
try {
Out.close ();
} catch (IOException e) {
Log.error ("Upload file off output failed", e);
}
}
}
}
}
PrintWriter out = null;
try {
out = Encodehead (request, response);
} catch (IOException e) {
E.printstacktrace ();
}
This place can not be less, otherwise the reception can not get the result of uploading
Out.write ("<script>parent.callback (' Upload file Success ') </script>);
Out.write (ImageName);
Out.close ();
}
/**
* Ajax helper method to get PrintWriter
* @return
* @throws IOException
* @throws IOException
* Request.setcharacterencoding ("Utf-8");
Response.setcontenttype ("text/html; Charset=utf-8 ");
*/
Private PrintWriter Encodehead (httpservletrequest request,httpservletresponse response) throws ioexception{
Request.setcharacterencoding ("Utf-8");
Response.setcontenttype ("text/html; Charset=utf-8 ");
return Response.getwriter ();
}
}
Ajax jsp no refresh upload file
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