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This article mainly introduces how the JSP HTTP server to support regular requests, the article is very detailed, has a certain reference value, interested friends must read it!

JSP HTTP server support for general requests

The regular request here means that the requested resource is a file type and does not need to be interpreted, compiled, executed, etc. For example: text file (* .TXT), hypertext file (* .HTM, * .HTML), script file (* .JS, * .VBS, etc.), picture file (* .JPG, * .PNG,*.GIF,*.BMP).

It is relatively simple to process requests based on file streams. You only need to read the local file resources and send them to the client.

Sample code for processing file stream requests on 1.JSP HTTP server

/ / Create client socket output stream m_sout = new PrintWriter (m_s.getOutputStream (), true); m_soutx = null; m_sout.println ("HTTP/1.0 200 OK\ nMIME-Version:1.0\ nContent-Type:text/html\ n\ n"); File file = new File (fileName); if (file.exists () = = true) {/ / Create local file input stream BufferedReader fin = new BufferedReader (new FileReader (file)); String line = null; String response = "" / / Read file by lines while ((line = fin.readLine ())! = null) {responseresponse = response + line + "\ n";} / / Send the content to client socket m_sout.println (response); / / Close local file handle fin.close ();}

The above is to process a request based on a text stream, and the following is an example code to process a request based on a binary stream.

Sample code for processing binary stream files on 2.JSP HTTP server

/ / Create client socket output stream m_sm_soutx = m_s.getOutputStream (); m_sout = null; String header = "HTTP/1.0 200 OK\ nMIME-Version:1.0\ n"; / / Send content to client socket m_soutx.write (header.getBytes ()); String mime = ""; / / Get MIME by file type switch (typeFlag) {case TYPE_JPEG: / / jpeg file {mime = "image/jpeg"; break } case TYPE_GIF: / / gif file {mime = "image/gif"; break;} case TYPE_BMP: / / bmp file {mime = "image/bmp"; break;} case TYPE_PNG: / / png file {mime = "image/png"; break;} mime = "Content-Type:" + mime + "\ n\ n"; m_soutx.write (mime.getBytes ()); File file = new File (fileName) If (file.exists () = = true) / / Read image files and send to client socket {/ / Create local file input stream RandomAccessFile fin = new RandomAccessFile (fileName, "r"); final long size = fin.length (); byte [] buffer = new byte [(int) size]; fin.readFully (buffer); fin.close (); / / Send data to client socket m_soutx.write (buffer);} / / Close client socket output stream m_soutx.close ()

As can be seen from the above code, requests for text streams and binary streams are handled differently. Files for text streams are processed by lines, while files for binary streams are read in batches.

The key point is that for different file types, when sending data to the client, you must specify the media type answered by the server, that is, MIME (Multipurpose Internet Mail Extensions), so that the resources answered to the client can be recognized by the client browser, and the corresponding application program is called to read the resources.

File type extension MIME

Text file .TXT text/plain

HTML (HyperText Markup Language) file .HTML, .HTM text/html

JPEG (Joint Photographic Experts Group) file .JPG, .JPEG image/jpeg

PNG (Portable Network Graphic Format) file .PNG image/png

BMP (Bitmap) file .BMP application/x-MS-bmp

GIF (Graphics Interchange Format) file .GIF image/gif

XML (EXtensible Markup Language) file .XML text/xml

MIME of commonly used types of files

These are all the contents of the article "how the JSP HTTP server supports regular requests". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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