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You will be prompted for the hostname of your mail server (which, if you're not sure of, can be obtained by looking at your e-mail client's settings), the username, and then the password For example, a user might type the following:
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java PopClientDemo Please enter POP3 server hostname: myservermyispcom Please enter mailbox username: johndoe Please enter mailbox password: javaduke
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The HyperText Transfer Protocol (HTTP) originated as a means of sharing documents across the Internet Since many documents are interrelated, the need to provide a link from one to the other was identified, but given the fact that many researchers from around the world were working independently, a single centralized document server was not the ideal method By placing a hyperlink over a word (such as a scientific term) or a phrase, users would be able to jump instantly from one document to another, even though the documents could reside on servers located in other countries Not only that, but hyperlinks could be made within the same document, such as to a glossary of terms Published as RFC 1945, HTTP became one of the most quickly adopted protocols, and led to what we now know as the World Wide Web Pioneered by Tim Berners-Lee and his colleagues at the CERN scientific laboratories as a way to share scientific information, it quickly spread to other parts of the academic world, and then to commercial and consumer markets The first, and most widely supported version, of HTTP is known as HTTP/10 This protocol supports a simple set of commands for retrieving resources from a Web server, such as HTML pages, images, documents, and other file types, as well as commands for posting information to the Web server so as to allow for the interactivity and customization of Web pages This capability is particularly important for Web sites that support advanced features, such as user customization or shopping carts The latest version of the protocol is known as HTTP/11 It offers many improvements over the previous version, with a wider set of commands to support new features of use both to browser developers and to those who write server-side Web applications However, older browsers and servers will not support all of these features, and indeed some are not yet in common use at all This next example demonstrates how to write a multi-threaded HTTP server that responds to requests from a Web browser, fetches files or Web pages, and sends them back to the user For the purposes of this example, we will use version 10 of the HTTP protocol and support only the GET method, which is used for file retrieval Other methods, such as POST, are useful when designing interactive server-side applications However, for such uses it is advised that the reader consider using a fully-fledged commercial server, and Java servlets (discussed in later chapters) Code for WebServerDemo
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import javaio*; import javanet*; import javautil*; // 8, Listing 3 public class WebServerDemo { // Directory of HTML pages and other files
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protected String docroot; // Port number of web server protected int port; // Socket for the web server protected ServerSocket ss; // Handler for a HTTP request class Handler extends Thread { protected Socket socket; protected PrintWriter pw; protected BufferedOutputStream bos; protected BufferedReader br; protected File docroot; public Handler(Socket _socket, String _docroot) throws Exception { socket=_socket; // Get the absolute directory of the filepath docroot=new File(_docroot)getCanonicalFile(); } public void run() { try { // Prepare our readers and writers br = new BufferedReader(new InputStreamReader(socketgetInputStream())); bos = new BufferedOutputStream(socketgetOutputStream()); pw = new PrintWriter(new OutputStreamWriter(bos)); // Read HTTP request from user (hopefully GET /file ) String line = brreadLine(); // Shutdown any further input socketshutdownInput(); if(line == null) { socketclose(); return; } if(linetoUpperCase()startsWith("GET")) { // Eliminate any trailing data, such as for a CGI // GET request StringTokenizer tokens = new StringTokenizer(line," "); tokensnextToken(); String req = tokensnextToken(); // If a path character / or \ is not present, add it // to the document root // and then add the file request, to form a full // filename String name; if(reqstartsWith("/") || reqstartsWith("\\")) name = thisdocroot+req; else name = thisdocroot+Fileseparator+req;
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// Get absolute file path File file = new File(name)getCanonicalFile(); // Check to see if request doesn't start with our // document root if(!filegetAbsolutePath()startsWith(thisdocrootgetAbsolutePath())) { pwprintln("HTTP/10 403 Forbidden"); pwprintln(); } // if it's missing else if(!fileexists()) { pwprintln("HTTP/10 404 File Not Found"); pwprintln(); } // if it can't be read for security reasons else if(!filecanRead()) { pwprintln("HTTP/10 403 Forbidden"); pwprintln(); } // if its actually a directory, and not a file else if(fileisDirectory()) { sendDir(bos,pw,file,req); } // or if it's really a file else { sendFile(bos, pw, filegetAbsolutePath()); } } // If not a GET request, the server will not support it else { pwprintln("HTTP/10 501 Not Implemented"); pwprintln(); } pwflush(); bosflush(); } catch(Exception e) { eprintStackTrace(); } try { socketclose(); } catch(Exception e) { eprintStackTrace(); } } protected void sendFile(BufferedOutputStream bos, PrintWriter pw, String filename) throws Exception
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{ try { javaioBufferedInputStream bis = new javaioBufferedInputStream(new FileInputStream(filename)); byte[] data = new byte[10*1024]; int read = bisread(data); pwprintln("HTTP/10 200 Okay"); pwprintln(); pwflush(); bosflush(); while(read != -1) { boswrite(data,0,read); read = bisread(data); } bosflush(); } catch(Exception e) { pwflush(); bosflush(); } } protected void sendDir(BufferedOutputStream bos, PrintWriter pw, File dir, String req) throws Exception { try { pwprintln("HTTP/10 200 Okay"); pwprintln(); pwflush(); pwprint("<html><head><title>Directory of "); pwprint(req); pwprint("</title></head><body><h1>Directory of "); pwprint(req); pwprintln("</h1><table border=\"0\">"); File[] contents=dirlistFiles(); for(int i=0;i<contentslength;i++) { pwprint("<tr>"); pwprint("<td><a href=\""); pwprint(req); pwprint(contents[i]getName()); if(contents[i]isDirectory()) pwprint("/"); pwprint("\">"); if(contents[i]isDirectory()) pwprint("Dir -> "); pwprint(contents[i]getName()); pwprint("</a></td>"); pwprintln("</tr>"); } pwprintln("</table></body></html>"); pwflush(); }
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catch(Exception e) { pwflush(); bosflush(); } } } // Check that a filepath has been specified and a port number protected void parseParams(String[] args) throws Exception { switch(argslength) { case 1: case 0: Systemerrprintln ("Syntax: <jvm> "+ thisgetClass()getName()+" docroot port"); Systemexit(0); default: thisdocroot = args[0]; thisport = IntegerparseInt(args[1]); break; } } public WebServerDemo(String[] args) throws Exception { Systemoutprintln ("Checking for paramaters"); // Check for command line parameters parseParams(args); Systemoutprint ("Starting web server "); // Create a new server socket thisss = new ServerSocket(thisport); Systemoutprintln ("OK"); for (;;) { // Accept a new socket connection from our server socket Socket accept = ssaccept(); // Start a new handler instance to process the request new Handler(accept, docroot)start(); } } // Start an instance of the web server running public static void main(String[] args) throws Exception { WebServerDemo webServerDemo = new WebServerDemo(args); } }
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