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Two changes must be made to a form for it to use the file control: I The request method must be POST I The encoding type (specified in the enctype attribute in the <FORM> tag) must be multipart/form-data If these conditions aren t met, the control is still displayed, but is treated like an ordinary text input field all that will be sent to the server is the filename More significant changes also must be made to the server program It must be able to extract the file contents, as well as the other nonfile parameter values, using the multipart/form-data encoding format discussed earlier in this chapter Limitations can also be imposed by the Web server on the size of files that can be uploaded The purpose of these restrictions is to prevent denial of service attacks that use huge files to bring down the Web server As an example of a file upload application, suppose LyricNotecom sponsors a contest in which users can upload MIDI files of their own musical compositions2 The winner(s) of the contest would receive music software products that LyricNote sells Figure 12-2 shows the input form

MIDI (Musical Instrument Digital Interface) uses a file format in which musical notes are described rather than actually recorded Their content is re-created by MIDI-compatible instruments or media players

The following HTML generates the form:

<form method="post" action="http://u25nv/lyricnote/servlet/midi_contest" enctype="multipart/form-data" > <table border="0" cellpadding="3" cellspacing=0> <tr valign="top"> <td colspan="2"> Are you a budding composer Submit a MIDI file of your own composition for a chance to win a copy of <B>ScoreWriter 45</B> Click <A HREF="product/midi_contest/ruleshtml">here</A> for official rules </td> </tr> <tr valign="top"> <td>Your name:</td> <td><input name="name" type="text" size=32></td> </tr> <tr valign="top"> <td>Your e-mail:</td> <td><input name="email" type="text" size=20></td> </tr> <tr valign="top"> <td>Title of composition:</td> <td><input name="title" type="text" size=48></td> </tr> <tr valign="top"> <td>MIDI file name:</td> <td><input type="file" name="midifile" size=32></td> </tr> <tr valign="top"> <td> </td> <td> <input type="submit" value="Send">

12:

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We don t need to the join the two tables to access the role. LINQ to SQL generates two SQL queries to retrieve both the Person and related Role data. See the two SQL statements in Figure 2-7.

When the form is submitted, the browser generates an HTTP request with a data stream in multipart/form-data format that contains, in part, the following:

Content-Type: multipart/form-data; boundary=---------------------------7d01012174012c Content-Length: 1507 -----------------------------7d01012174012c Content-Disposition: form-data; name="name" S Vetter -----------------------------7d01012174012c Content-Disposition: form-data; name="email" vetter@lyricnotecom -----------------------------7d01012174012c Content-Disposition: form-data; name="title" It-B-Gone -----------------------------7d01012174012c Content-Disposition: form-data; name="midifile"; filename="C:\my_midi_files\Itbgonmid" Content-Type: audio/mid MThd (binary data not shown) -----------------------------7d01012174012c-JSP IN ACTION

We can see the four input fields are present, each in their own blocks delimited by the boundary string Each block has a Content-Disposition header that specifies the field name The last block, which contains the uploaded file, also has a filename attribute on its Content-Disposition header that gives the original file name on the client system, as well as a Content-Type header, which indicates the file data is in a binary format known as audio/mid The server program can parse the data stream and extract the field values and file content

Figure 12-2

Not all input comes from the user, at least not directly Some forms may use constants that are hard coded or dynamically generated An INPUT element with type= hidden can be used for this purpose Its syntax is shown here, <INPUT type= hidden name= name value= value > and the attributes have the following meanings: I type= hidden indicates this is a hidden control I name= name specifies a name by which scripts can refer to this control This is also the name by which the text can be retrieved by the server program

12:

I value= value must be used to assign an initial text value As you might guess, a hidden field has no visual representation Its only purpose is to create a parameter with a constant value This might be a transaction code of some kind, which a dispatching servlet would use as a key to a table of other classes More often, though, a hidden field has a value that s dynamically generated by the servlet or a JSP page that created the HTML For example,

<input type="hidden" name="remoteHost" value="<%= requestgetRemoteHost() %>"> <input type="hidden" name="userAgent" value="<%= requestgetHeader("user-agent") %>">

would store the IP address or host name on which the Web browser is running and a string identifying the browser software and version number as hidden fields in the form These fields might be useful to technical support people working on a problem with the form

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