Implement file upload in JSP, a lot of available libraries, such as the famous JSPSMART SMARTupload, Struts is also available. I said COS, it is O'Reilly, O'Reilly book is very 8 wrong, this uploaded component is great, the most important thing is that it is Open Source.
1. Download the latest COS package (
Http://www.servlets.com/cos/index.html, join your ClassPath
2. Write a JSP that needs to upload files. For convenience, I use a simple HTM file. In this page, we will allow users to upload 3 files at a time.
/upload.htm///
[PRE]
"http://www.w3.org/tr/html4/loose.dtd">
No title document </ Title></p>
<p></ hEAD></p>
<p><body></p>
<p><! - EncType's value is very important, upload.jsp is the JSP -> of the uploaded.</p>
<p><form name = "form1" method = "post" enctype = "multipart / form-data" action = "upload.jsp"></p>
<p><p></p>
<p><Input name = "file1" type = "file"></p>
<p></ p></p>
<p><p></p>
<p><Input Name = "file2" type = "file"></p>
<p></ p></p>
<p><p> <input name = "file3" type = "file"></p>
<p></ p></p>
<p><p></p>
<p><Input Type = "Submit" name = "Submit" Value = "Upload"></p>
<p></ p></p>
<p></ form></p>
<p></ body></p>
<p></ html> [/ pre]</p>
<p>3. In C: / Redefinalize a directory C: / Upload to store uploaded files.</p>
<p>4. Write a JSP or servlet to achieve upload, I am using a UPLOAD.JSP here, so you don't have to configure web.xml, huh, it is more lazy.</p>
<p>UPLOAD.JSP</p>
<p><% @ PAGE</p>
<p>IMPORT =</p>
<p>"java.io. *"%></p>
<p><% @ PAGE</p>
<p>IMPORT =</p>
<p>"com.oreilly.servlet.multipartRequest"%></p>
<p><% @ PAGE</p>
<p>IMPORT =</p>
<p>"com.oreilly.servlet.multipart.coverfileerenamepolicy"%></p>
<p><% @ Page ContentType =</p>
<p>"text / html; charSet = GB2312"%></p>
<p><%</p>
<p>// After the file is uploaded, save it in c: // uploadstring savedirectory =</p>
<p>"c: // upload";</p>
<p>/ / Each file is up to 5m, up to 3 files, so ...</p>
<p>INT MAXPOSTSIZE = 3 * 5 * 1024 * 1024;</p>
<p>// RESPONSE is encoded as "GB2312", and the default file name conflict resolution policy is used to achieve upload</p>
<p>MultipartRequest Multi =</p>
<p>New MultipartRequest (Request, Savedirectory, MaxPostsize,</p>
<p>"GB2312");</p>
<p>// Output Feedback Information</p>
<p>ENUMERATION FILES = MULTI.GETFILENAMES ();</p>
<p>While (files.hasmorelements ()) {</p>
<p>System.err.println</p>
<p>"ccc");</p>
<p>String name = (string) FILES.NEXTELEMENT ();</p>
<p>File f = multi.getfile (Name);</p>
<p>IF (f! = null) {</p>
<p>String filename = multi.getFileSystemName (name);</p>
<p>String lastfilename = savedirectory </p>
<p>"//" filename; out.println ("Uploaded file: lastfilename); out.println (" <hr> ");}}}%> <meta http-equiv =" content-type "content =" TEXT / HTML; Charset = GB2312 "> 5. Finally, the 2 files will be released to your server. Upload files will be done, you want to embed the function of sending attachments in your mail system, and use this to do it.</p></div><div class="text-center mt-3 text-grey">
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