Steve:
An HTTP response may only have one content type. If you wish to send
multiple documents of different types to the client in a single HTTP
response. One way to do this is to set the content type to multipart/mixed,
and encode your messages as follows:
Content-type: multipart/mixed; boundary=END-OF-SECTION
--END-OF-SECTION
Content-type: text/html
<html><head>
<title>Downloading to Disk</title>
</head>
<body>
<h1>Downloading to Disk</h1>
The files "foobar.test" and "foobar2.test" are being downloaded to
your system. Please read the license agreement carefully.
--END-OF-SECTION
Content-type: application/octet-stream
Content-disposition: filename="foobar.test"
...The contents of "foobar.test" goes here...
--END-OF-SECTION
Content-type: application/octet-stream
Content-disposition: filename="foobar2.test"
...The contents of "foobar2.test" goes here...
--END-OF-SECTION--
Your application will will need to deal with break apart the individual mime
documents.
There are some classes that will help you with this in javax.mail.* and
javax.mail.internet.*;
I think you'll find this in the Java mail api (which you can download from
sun).
I hope this helps.
Tom Drake
----- Original Message -----
From: "Ball, Steve" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>;
<[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Thursday, November 29, 2001 6:45 AM
Subject: mutipart/x-mixed-replace and HttpURLConnection
| I am working on "Server Push" from a Servlet to a Java client using
| HttpURLConnection. I am attempting to set the boundaries and set the
other
| mime types in my servlet, but my client seems to only understand the first
| call using .setContentType(""); Is what I am doing even feasible? Any
tips
| would be much appreciated.
|
| ++++++++++++++++++++
| client
| ++++++++++++++++++++
| URLConnection con = url.openConnection();
| con.setDoOutput(true);
| con.setDoInput(true);
| con.setUseCaches(false);
| ((HttpURLConnection)con).setRequestMethod("POST");
| ((HttpURLConnection)con).setRequestProperty("Connection",
| "Keep-Alive");
| ((HttpURLConnection)con).setRequestProperty("Content-type",
| "multipart/x-mixed-replace; boundary=End");
|
| .
| .
| .
| .
|
| String header = con.getContentType();
| System.out.println("Header:" + header);
| if (header.equals("text/start"))
| {
| start = con.getContent();
| System.out.println("Actual Content:" + (String)start);
| }
| else if (header.equals("text/file"))
| {
| file = con.getContent();
| System.out.println((String)file);
| }
| else if (header.equals("text/file-progress"))
| {
| fileprogress = con.getContent();
| System.out.println((String)fileprogress);
| }
| else if (header.equals("text/end"))
| {
| end = con.getContent();
| System.out.println((String)end);
| keep_reading = false;
| }
| else
| {
| System.out.println("Unknown Content Type: " + header);
| Object obj = con.getContent();
| if (obj != null)
| System.out.println("Something is there");
| else
| System.out.println("Nothing is in there");
|
|
| ++++++++++++++++++++
| server
| ++++++++++++++++++++
|
|
| ServletOutputStream out = res.getOutputStream();
| res.setContentType("multipart/x-mixed-replace; boundary=End");
| out.println();
| out.println("--End");
|
| out.println("Content-Type: " + "text/start");
| out.println();
| StringBuffer startCommand = new StringBuffer();
| startCommand.append("Start Data");
|
| //res.setContentType("text/start");
| res.setContentLength(startCommand.toString().getBytes().length + 55);
| out.print(startCommand.toString());
| out.println();
| out.println("--End");
| out.flush();
|
|
|
| Basically, the current behavior of the client is that it is looping around
| and gets from the server only the mime type set using setContentType();
| which in this case is only multipart/x-mixed-replace type. The content
| types set using the out.println("Content-Type: " + "text/start"); are
| ignored. By the way, I am supporting my own mime types and that appears
to
| work okay. The content type which does seem to appear rather than
| x-mixed-replace is a class called sun.net.www.MeteredStream. As I said
| earlier, any help would be much appreciated.
|
| Thanks,
| Steve
|
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|
|
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