Examples of Ajax FileUpload and Struts2 implement multi-File upload function

Single-File and multi-file implementation differences are mainly modified two, one is the plug-in ajaxfileupload.js to receive file ID, the second is the background action is an array of receive. This article mainly introduces the AJAXFILEUPLOAD+STRUTS2 implementation of multi-file upload function, the need for friends can refer to, hope to help everyone.

1. ajaxfileupload File Download Address http://www.phpletter.com/Demo/AjaxFileUpload-Demo/

2, the introduction of Jquery-1.8.0.min.js, Ajaxfileupload.js file

3, File upload page core code

<body> <form action= "" enctype= "Multipart/form-data" > 
The files parameters received by the Fileelementid attribute above are [' file1 ', ' file2 ', ' file3 ']

Since it is multi-file, we need to modify ajaxfileupload.js to find the following code

var oldelement = jQuery (' # ' + Fileelementid); var newelement = jQuery (oldelement). Clone (); JQuery (oldelement). attr (' id ', fileId); JQuery (Oldelement). before (newelement); JQuery (oldelement). AppendTo (form);
Modified to:

for (var i in Fileelementid) {    var oldelement = jQuery (' # ' + fileelementid[i]);    var newelement = jQuery (oldelement). Clone ();    JQuery (oldelement). attr (' id ', fileId);    JQuery (Oldelement). before (newelement);    JQuery (oldelement). AppendTo (form);  }
4. File Upload action

public class Fileaction {private file[] File;  File private string[] filefilename;    File name private string[] FilePath; File path private String Downloadfilepath;    File download path private InputStream InputStream; /** * File Upload * @return */public String FileUpload () {String path = Servletactioncontext.getservletcontext ()     . Getrealpath ("/upload"); File File = new file (path);     Determine if the folder exists and if it does not exist create the folder if (!file.exists ()) {File.mkdir ();         } try {if (this.file! = null) {file f[] = This.getfile ();         FilePath = new String[f.length]; for (int i = 0; i < f.length; i++) {String fileName = Java.util.UUID.randomUUID (). toString ();//the party using time +uuid String name = FileName + filefilename[i].substring (Filefilename[i].lastindexof ("."));           File name saved on hard disk fileinputstream InputStream = new FileInputStream (F[i]);         FileOutputStream outputstream = new FileOutputStream (path+ "\ \" + name);  byte[] buf = new byte[1024];           int length = 0;           while (length = Inputstream.read (BUF))! =-1) {outputstream.write (buf, 0, length);           } inputstream.close ();           Outputstream.flush ();           Full path to file save//such as: D:\tomcat6\webapps\struts_ajaxfileupload\\upload\a0be14a1-f99e-4239-b54c-b37c3083134a.png         Filepath[i] = path + "\ \" + Name;     }}} catch (Exception e) {e.printstacktrace ();   } return "Success";     /** * File Download * @return * * * public String DownloadFile () {string path = Downloadfilepath;     HttpServletResponse response = Servletactioncontext.getresponse ();       The try {//path refers to the path of the file to be downloaded.       File File = new file (path);       Gets the file name.       String filename = File.getname ();       Download the file in the form of a stream.       InputStream fis = new Bufferedinputstream (new FileInputStream (path));       byte[] buffer = new byte[fis.available ()];       Fis.read (buffer); Fis.close();       Empty response Response.reset ();       Set response header String filenamestring = new String (Filename.getbytes ("GBK"), "iso-8859-1");       Response.AddHeader ("Content-disposition", "attachment;filename=" + filenamestring);       Response.AddHeader ("Content-length", "" "+ File.length ());       OutputStream toclient = new Bufferedoutputstream (Response.getoutputstream ());       Response.setcontenttype ("Application/octet-stream");       Toclient.write (buffer);       Toclient.flush ();     Toclient.close ();     } catch (IOException ex) {ex.printstacktrace ();   } return null; }/** * Omit set Get method */}
 5, Struts configuration 
 

<! DOCTYPE struts Public "-//apache software foundation//dtd struts Configuration 2.0//en" "Http://struts.apache.org/dtd     S/struts-2.0.dtd "> <struts> <package name=" Ajax_code "extends=" Json-default "> <!--file Upload-- <action name= "fileuploadaction" class= "com.itmyhome.FileAction" method= "FileUpload" > <result type= "JSON" n Ame= "Success" > <param name= "contentType" >text/html</param> </result> </action&gt   ; </package> <package name= "Jsp_code" extends= "Struts-default" > <!--File Download--<action name            = "DownloadFile" class= "com.itmyhome.FileAction" method= "DownloadFile" > <result type= "Stream" > <param name= "ContentType" >application/octet-stream</param> <param name= "InputName" >inputstrea            m</param> <param name= "Contentdisposition" >attachment;filename=${fileName}</param> <param Name= "BufferSize" >4096</param> </result> </action> </package> </struts> 
Browser input: http://localhost:8080/struts_ajaxfileupload/index.jsp for file Upload