The Apache Commons-fileupload.jar is placed under the web-inf\lib of the application and can be used. The following example describes how to use its file upload feature.
The FileUpload version used is 1.2 and the environment is eclipse3.3+myeclipse6.0. FileUpload is based on Commons io, so make sure that the Commons IO jar package (used Commons-io-1.3.2.jar) is under Web-inf\lib before entering the project.
This article is an example project that can be downloaded in the final attachment of the article.
Example 1
In the simplest case, by servletfileupload the static class to parse the request, the factory class Fileitemfactory will handle all the fields in the Mulipart class's form, not just the file field. GetName () Gets the file name, getString () Gets the form data content, Isformfield () can determine whether it is a normal form item.
Demo1.html
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>File upload</title>
<body>
//必须是multipart的表单数据。
<form name="myform" action="demo1.jsp" method="post"
enctype="multipart/form-data">
Your name: <br>
<input type="text" name="name" size="15"><br>
File:<br>
<input type="file" name="myfile"><br>
<br>
<input type="submit" name="submit" value="Commit">
</form>
</body>
demo1.jsp
<%@ page language= "java" contenttype= "text/html; charset=gb18030"
pageencoding= "GB18030"%>
<%@ page import= "org.apache.commons.fileupload.*"%>
<%@ page import= org.apache.commons.fileupload.servlet.* "%>
<%@ page import=" org.apache.commons.fileupload.disk.* "%>
<%@ page import= "java.util.*"%>
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en"
<%
Boolean ismultipart = Servletfileupload. Ismultipartcontent (Request)//Check whether the input requests are multipart form data.
if (Ismultipart = = True) {
Fileitemfactory factory = new Diskfileitemfactory ()//Create a diskfileitemfacto for the request Ry object to parse the request. After parsing is performed, all form items are saved in a list.
Servletfileupload upload = new Servletfileupload (factory);
list<fileitem> items = upload.parserequest (request);
Iterator<fileitem> ITR = Items.iterator ();
while (Itr.hasnext ()) {
Fileitem item = (Fileitem) itr.next ();
Check if the current item is a plain form item orPass the file.
if (Item.isformfield ()) {//If it is a plain form item, display the contents of the form.
String fieldName = Item.getfieldname ();
if (fieldname.equals ("name"))//Correspondence demo1.html type= "text" name= "name"
Out.print ("The field name is" + IT Em.getstring ());//Displays the contents of the form.
Out.print ("<br>");
} else {//If the file is uploaded, displays the file name.
Out.print ("The Upload file name is" + item.getname ());
Out.print ("<br>");
}
}
} else {
Out.print ("The enctype must be Multipart/form-data");
%>
<meta http-equiv= "Content-type" content= text/html; charset= GB18030 "
<title>file upload</title>
<body>
</body>
Results:
The field name Isjeff
The upload file name isd:\c language Exam sample/job title. rar
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