Java/Network Protocol/Web Server — различия между версиями
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Текущая версия на 10:19, 1 июня 2010
Содержание
A simple HTTP server that displays information about all accessible printers on the network
<source lang="java">
/*
* Copyright (c) 2004 David Flanagan. All rights reserved. * This code is from the book Java Examples in a Nutshell, 3nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose, * including teaching and use in open-source projects. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book, * please visit http://www.davidflanagan.ru/javaexamples3. */
//package je3.nio; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; import java.nio.charset.Charset; import java.nio.charset.CharsetEncoder; import java.util.Iterator; import java.util.Set; import javax.print.PrintService; import javax.print.PrintServiceLookup; import javax.print.attribute.Attribute; /**
* PrintServiceWebInterface: A simple HTTP server that displays information * about all accessible printers on the network. */
public class PrintServiceWebInterface {
public static void main(String[] args) throws IOException { // Get the character encoders and decoders we"ll need Charset charset = Charset.forName("ISO-8859-1"); CharsetEncoder encoder = charset.newEncoder(); // The HTTP headers we send back to the client are fixed String headers = "HTTP/1.1 200 OK\r\n" + "Content-type: text/html\r\n" + "Connection: close\r\n" + "\r\n"; // We"ll use two buffers in our response. One holds the fixed // headers, and the other holds the variable body of the response. ByteBuffer[] buffers = new ByteBuffer[2]; buffers[0] = encoder.encode(CharBuffer.wrap(headers)); ByteBuffer body = ByteBuffer.allocateDirect(16 * 1024); buffers[1] = body; // Find all available PrintService objects to describe PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null); // All of the channels we use in this code will be in non-blocking // mode. So we create a Selector object that will block while // monitoring all of the channels and will only stop blocking when // one or more of the channels is ready for I/O of some sort. Selector selector = Selector.open(); // Create a new ServerSocketChannel, and bind it to port 8000. // Note that we have to do this using the underlying ServerSocket. ServerSocketChannel server = ServerSocketChannel.open(); server.socket().bind(new java.net.InetSocketAddress(8000)); // Put the ServerSocketChannel into non-blocking mode server.configureBlocking(false); // Now register the channel with the Selector. The SelectionKey // represents the registration of this channel with this Selector. SelectionKey serverkey = server.register(selector, SelectionKey.OP_ACCEPT); for (;;) { // The main server loop. The server runs forever. // This call blocks until there is activity on one of the // registered channels. This is the key method in non-blocking I/O. selector.select(); // Get a java.util.Set containing the SelectionKey objects for // all channels that are ready for I/O. Set keys = selector.selectedKeys(); // Use a java.util.Iterator to loop through the selected keys for (Iterator i = keys.iterator(); i.hasNext();) { // Get the next SelectionKey in the set, and then remove it // from the set. It must be removed explicitly, or it will // be returned again by the next call to select(). SelectionKey key = (SelectionKey) i.next(); i.remove(); // Check whether this key is the SelectionKey we got when // we registered the ServerSocketChannel. if (key == serverkey) { // Activity on the ServerSocketChannel means a client // is trying to connect to the server. if (key.isAcceptable()) { // Accept the client connection, and obtain a // SocketChannel to communicate with the client. SocketChannel client = server.accept(); // Make sure we actually got a connection if (client == null) continue; // Put the client channel in non-blocking mode. client.configureBlocking(false); // Now register the client channel with the Selector, // specifying that we"d like to know when there is // data ready to read on the channel. SelectionKey clientkey = client.register(selector, SelectionKey.OP_READ); } } else { // If the key we got from the Set of keys is not the // ServerSocketChannel key, then it must be a key // representing one of the client connections. // Get the channel from the key. SocketChannel client = (SocketChannel) key.channel(); // If we got here, it should mean that there is data to // be read from the channel, but we double-check here. if (!key.isReadable()) continue; // Now read bytes from the client. We assume that // we get all the client"s bytes in one read operation client.read(body); // The data we read should be some kind of HTTP GET // request. We don"t bother checking it however since // there is only one page of data we know how to return. body.clear(); // Build an HTML document as our reponse. // The body of the document contains PrintService details StringBuffer response = new StringBuffer(); response.append("<html><head><title>Printer Status</title></head>"+ "<body>
Printer Status
");for (int s = 0; s < services.length; s++) { PrintService service = services[s];response.append("
").append(service.getName()).append("
").append(attr.getName()).append(" | ").append(attr) .append(" |
} response.append("</body></html>\r\n"); // Encode the response into the body ByteBuffer encoder.reset(); encoder.encode(CharBuffer.wrap(response), body, true); encoder.flush(body); body.flip(); // Prepare the body buffer to be drained // While there are bytes left to write while (body.hasRemaining()) { // Write both header and body buffers client.write(buffers); } buffers[0].flip(); // Prepare header buffer for next write body.clear(); // Prepare body buffer for next read // Once we"ve sent our response, we have no more interest // in the client channel or its SelectionKey client.close(); // Close the channel. key.cancel(); // Tell Selector to stop monitoring it. } } } }
}
</source>
A simple, tiny, nicely embeddable HTTP 1.0 server in Java
<source lang="java">
/*
"Copyright (C) 2001,2005 by Jarno Elonen <elonen@iki.fi>\n"+ "\n"+ "Redistribution and use in source and binary forms, with or without\n"+ "modification, are permitted provided that the following conditions\n"+ "are met:\n"+ "\n"+ "Redistributions of source code must retain the above copyright notice,\n"+ "this list of conditions and the following disclaimer. Redistributions in\n"+ "binary form must reproduce the above copyright notice, this list of\n"+ "conditions and the following disclaimer in the documentation and/or other\n"+ "materials provided with the distribution. The name of the author may not\n"+ "be used to endorse or promote products derived from this software without\n"+ "specific prior written permission. \n"+ " \n"+ "THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS"" AND ANY EXPRESS OR\n"+ "IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"+ "OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"+ "IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"+ "INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n"+ "NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n"+ "DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n"+ "THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"+ "(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n"+ "OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."; */
import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.net.URLEncoder; import java.util.Date; import java.util.Enumeration; import java.util.Hashtable; import java.util.Locale; import java.util.Properties; import java.util.StringTokenizer; import java.util.TimeZone; /**
* A simple, tiny, nicely embeddable HTTP 1.0 server in Java **
* NanoHTTPD version 1.1, Copyright © 2001,2005-2007 Jarno Elonen * (elonen@iki.fi, http://iki.fi/elonen/) * * <p> * Features + limitations: *
-
*
*
- Only one Java file *
- Java 1.1 compatible *
- Released as open source, Modified BSD licence *
- No fixed config files, logging, authorization etc. (Implement yourself * if you need them.) *
- Supports parameter parsing of GET and POST methods *
- Supports both dynamic content and file serving *
- Never caches anything *
- Doesn"t limit bandwidth, request time or simultaneous connections *
- Default code serves files and shows all HTTP parameters and headers *
- File server supports directory listing, index.html and index.htm *
- File server does the 301 redirection trick for directories without "/" *
- File server supports simple skipping for files (continue download) *
- File server uses current directory as a web root *
- File server serves also very long files without memory overhead *
- Contains a built-in list of most common mime types *
- All header names are converted lowercase so they don"t vary between * browsers/clients
**
* * <p> * Ways to use:*
-
*
*
- Run as a standalone app, serves files from current directory and shows * requests *
- Subclass serve() and embed to your own program *
- Call serveFile() from serve() with your own base directory
**
* * See the end of the source file for distribution license (Modified BSD * licence) */
public class NanoHTTPD {
// // API parts // /** * Override this to customize the server. * <p> * * (By default, this delegates to serveFile() and allows directory listing.) * * @parm uri Percent-decoded URI without parameters, for example "/index.cgi" * @parm method "GET", "POST" etc. * @parm parms Parsed, percent decoded parameters from URI and, in case of * POST, data. * @parm header Header entries, percent decoded * @return HTTP response, see class Response for details */ public Response serve(String uri, String method, Properties header, Properties parms) { System.out.println(method + " "" + uri + "" "); Enumeration e = header.propertyNames(); while (e.hasMoreElements()) { String value = (String) e.nextElement(); System.out.println(" HDR: "" + value + "" = "" + header.getProperty(value) + """); } e = parms.propertyNames(); while (e.hasMoreElements()) { String value = (String) e.nextElement(); System.out.println(" PRM: "" + value + "" = "" + parms.getProperty(value) + """); } return serveFile(uri, header, new File("."), true); } /** * HTTP response. Return one of these from serve(). */ public class Response { /** * Default constructor: response = HTTP_OK, data = mime = "null" */ public Response() { this.status = HTTP_OK; } /** * Basic constructor. */ public Response(String status, String mimeType, InputStream data) { this.status = status; this.mimeType = mimeType; this.data = data; } /** * Convenience method that makes an InputStream out of given text. */ public Response(String status, String mimeType, String txt) { this.status = status; this.mimeType = mimeType; this.data = new ByteArrayInputStream(txt.getBytes()); } /** * Adds given line to the header. */ public void addHeader(String name, String value) { header.put(name, value); } /** * HTTP status code after processing, e.g. "200 OK", HTTP_OK */ public String status; /** * MIME type of content, e.g. "text/html" */ public String mimeType; /** * Data of the response, may be null. */ public InputStream data; /** * Headers for the HTTP response. Use addHeader() to add lines. */ public Properties header = new Properties(); } /** * Some HTTP response status codes */ public static final String HTTP_OK = "200 OK", HTTP_REDIRECT = "301 Moved Permanently", HTTP_FORBIDDEN = "403 Forbidden", HTTP_NOTFOUND = "404 Not Found", HTTP_BADREQUEST = "400 Bad Request", HTTP_INTERNALERROR = "500 Internal Server Error", HTTP_NOTIMPLEMENTED = "501 Not Implemented"; /** * Common mime types for dynamic content */ public static final String MIME_PLAINTEXT = "text/plain", MIME_HTML = "text/html", MIME_DEFAULT_BINARY = "application/octet-stream"; // // Socket & server code // /** * Starts a HTTP server to given port. * <p> * Throws an IOException if the socket is already in use */ public NanoHTTPD(int port) throws IOException { myTcpPort = port; final ServerSocket ss = new ServerSocket(myTcpPort); Thread t = new Thread(new Runnable() { public void run() { try { while (true) new HTTPSession(ss.accept()); } catch (IOException ioe) { } } }); t.setDaemon(true); t.start(); } /** * Starts as a standalone file server and waits for Enter. */ public static void main(String[] args) { System.out.println("NanoHTTPD 1.1 (C) 2001,2005-2007 Jarno Elonen\n" + "(Command line options: [port] [--licence])\n"); // Show licence if requested int lopt = -1; for (int i = 0; i < args.length; ++i) if (args[i].toLowerCase().endsWith("licence")) { lopt = i; System.out.println(LICENCE + "\n"); } // Change port if requested int port = 80; if (args.length > 0 && lopt != 0) port = Integer.parseInt(args[0]); if (args.length > 1 && args[1].toLowerCase().endsWith("licence")) System.out.println(LICENCE + "\n"); NanoHTTPD nh = null; try { nh = new NanoHTTPD(port); } catch (IOException ioe) { System.err.println("Couldn"t start server:\n" + ioe); System.exit(-1); } nh.myFileDir = new File(""); System.out.println("Now serving files in port " + port + " from \"" + new File("").getAbsolutePath() + "\""); System.out.println("Hit Enter to stop.\n"); try { System.in.read(); } catch (Throwable t) { } ; } /** * Handles one session, i.e. parses the HTTP request and returns the response. */ private class HTTPSession implements Runnable { public HTTPSession(Socket s) { mySocket = s; Thread t = new Thread(this); t.setDaemon(true); t.start(); } public void run() { try { InputStream is = mySocket.getInputStream(); if (is == null) return; BufferedReader in = new BufferedReader(new InputStreamReader(is)); // Read the request line StringTokenizer st = new StringTokenizer(in.readLine()); if (!st.hasMoreTokens()) sendError(HTTP_BADREQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html"); String method = st.nextToken(); if (!st.hasMoreTokens()) sendError(HTTP_BADREQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html"); String uri = decodePercent(st.nextToken()); // Decode parameters from the URI Properties parms = new Properties(); int qmi = uri.indexOf("?"); if (qmi >= 0) { decodeParms(uri.substring(qmi + 1), parms); uri = decodePercent(uri.substring(0, qmi)); } // If there"s another token, it"s protocol version, // followed by HTTP headers. Ignore version but parse headers. // NOTE: this now forces header names uppercase since they are // case insensitive and vary by client. Properties header = new Properties(); if (st.hasMoreTokens()) { String line = in.readLine(); while (line.trim().length() > 0) { int p = line.indexOf(":"); header.put(line.substring(0, p).trim().toLowerCase(), line.substring(p + 1).trim()); line = in.readLine(); } } // If the method is POST, there may be parameters // in data section, too, read it: if (method.equalsIgnoreCase("POST")) { long size = 0x7FFFFFFFFFFFFFFFl; String contentLength = header.getProperty("content-length"); if (contentLength != null) { try { size = Integer.parseInt(contentLength); } catch (NumberFormatException ex) { } } String postLine = ""; char buf[] = new char[512]; int read = in.read(buf); while (read >= 0 && size > 0 && !postLine.endsWith("\r\n")) { size -= read; postLine += String.valueOf(buf, 0, read); if (size > 0) read = in.read(buf); } postLine = postLine.trim(); decodeParms(postLine, parms); } // Ok, now do the serve() Response r = serve(uri, method, header, parms); if (r == null) sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: Serve() returned a null response."); else sendResponse(r.status, r.mimeType, r.header, r.data); in.close(); } catch (IOException ioe) { try { sendError(HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage()); } catch (Throwable t) { } } catch (InterruptedException ie) { // Thrown by sendError, ignore and exit the thread. } } /** * Decodes the percent encoding scheme.
For example: * "an+example%20string" -> "an example string" */ private String decodePercent(String str) throws InterruptedException { try { StringBuffer sb = new StringBuffer(); for (int i = 0; i < str.length(); i++) { char c = str.charAt(i); switch (c) { case "+": sb.append(" "); break; case "%": sb.append((char) Integer.parseInt(str.substring(i + 1, i + 3), 16)); i += 2; break; default: sb.append(c); break; } } return new String(sb.toString().getBytes()); } catch (Exception e) { sendError(HTTP_BADREQUEST, "BAD REQUEST: Bad percent-encoding."); return null; } } /** * Decodes parameters in percent-encoded URI-format ( e.g. * "name=Jack%20Daniels&pass=Single%20Malt" ) and adds them to given * Properties. */ private void decodeParms(String parms, Properties p) throws InterruptedException { if (parms == null) return; StringTokenizer st = new StringTokenizer(parms, "&"); while (st.hasMoreTokens()) { String e = st.nextToken(); int sep = e.indexOf("="); if (sep >= 0) p.put(decodePercent(e.substring(0, sep)).trim(), decodePercent(e.substring(sep + 1))); } } /** * Returns an error message as a HTTP response and throws * InterruptedException to stop furhter request processing. */ private void sendError(String status, String msg) throws InterruptedException { sendResponse(status, MIME_PLAINTEXT, null, new ByteArrayInputStream(msg.getBytes())); throw new InterruptedException(); } /** * Sends given response to the socket. */ private void sendResponse(String status, String mime, Properties header, InputStream data) { try { if (status == null) throw new Error("sendResponse(): Status can"t be null."); OutputStream out = mySocket.getOutputStream(); PrintWriter pw = new PrintWriter(out); pw.print("HTTP/1.0 " + status + " \r\n"); if (mime != null) pw.print("Content-Type: " + mime + "\r\n"); if (header == null || header.getProperty("Date") == null) pw.print("Date: " + gmtFrmt.format(new Date()) + "\r\n"); if (header != null) { Enumeration e = header.keys(); while (e.hasMoreElements()) { String key = (String) e.nextElement(); String value = header.getProperty(key); pw.print(key + ": " + value + "\r\n"); } } pw.print("\r\n"); pw.flush(); if (data != null) { byte[] buff = new byte[2048]; while (true) { int read = data.read(buff, 0, 2048); if (read <= 0) break; out.write(buff, 0, read); } } out.flush(); out.close(); if (data != null) data.close(); } catch (IOException ioe) { // Couldn"t write? No can do. try { mySocket.close(); } catch (Throwable t) { } } } private Socket mySocket; }; /** * URL-encodes everything between "/"-characters. Encodes spaces as "%20" * instead of "+". */ private String encodeUri(String uri) { String newUri = ""; StringTokenizer st = new StringTokenizer(uri, "/ ", true); while (st.hasMoreTokens()) { String tok = st.nextToken(); if (tok.equals("/")) newUri += "/"; else if (tok.equals(" ")) newUri += "%20"; else { newUri += URLEncoder.encode(tok); // For Java 1.4 you"ll want to use this instead: // try { newUri += URLEncoder.encode( tok, "UTF-8" ); } catch ( // UnsupportedEncodingException uee ) } } return newUri; } private int myTcpPort; File myFileDir; // // File server code // /** * Serves file from homeDir and its" subdirectories (only). Uses only URI, * ignores all headers and HTTP parameters. */ public Response serveFile(String uri, Properties header, File homeDir, boolean allowDirectoryListing) { // Make sure we won"t die of an exception later if (!homeDir.isDirectory()) return new Response(HTTP_INTERNALERROR, MIME_PLAINTEXT, "INTERNAL ERRROR: serveFile(): given homeDir is not a directory."); // Remove URL arguments uri = uri.trim().replace(File.separatorChar, "/"); if (uri.indexOf("?") >= 0) uri = uri.substring(0, uri.indexOf("?")); // Prohibit getting out of current directory if (uri.startsWith("..") || uri.endsWith("..") || uri.indexOf("../") >= 0) return new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT, "FORBIDDEN: Won"t serve ../ for security reasons."); File f = new File(homeDir, uri); if (!f.exists()) return new Response(HTTP_NOTFOUND, MIME_PLAINTEXT, "Error 404, file not found."); // List the directory, if necessary if (f.isDirectory()) { // Browsers get confused without "/" after the // directory, send a redirect. if (!uri.endsWith("/")) { uri += "/"; Response r = new Response(HTTP_REDIRECT, MIME_HTML, "<html><body>Redirected: "; // Show file size if (curFile.isFile()) { long len = curFile.length(); msg += " ("; if (len < 1024) msg += curFile.length() + " bytes"; else if (len < 1024 * 1024) msg += curFile.length() / 1024 + "." + (curFile.length() % 1024 / 10 % 100) + " KB"; else msg += curFile.length() / (1024 * 1024) + "." + curFile.length() % (1024 * 1024) / 10 % 100 + " MB"; msg += ")"; } msg += "
"; if (dir) msg += "</b>"; } return new Response(HTTP_OK, MIME_HTML, msg); } else { return new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT, "FORBIDDEN: No directory listing."); } } try { // Get MIME type from file name extension, if possible String mime = null; int dot = f.getCanonicalPath().lastIndexOf("."); if (dot >= 0) mime = (String) theMimeTypes.get(f.getCanonicalPath().substring(dot + 1).toLowerCase()); if (mime == null) mime = MIME_DEFAULT_BINARY; // Support (simple) skipping: long startFrom = 0; String range = header.getProperty("Range"); if (range != null) { if (range.startsWith("bytes=")) { range = range.substring("bytes=".length()); int minus = range.indexOf("-"); if (minus > 0) range = range.substring(0, minus); try { startFrom = Long.parseLong(range); } catch (NumberFormatException nfe) { } } } FileInputStream fis = new FileInputStream(f); fis.skip(startFrom); Response r = new Response(HTTP_OK, mime, fis); r.addHeader("Content-length", "" + (f.length() - startFrom)); r.addHeader("Content-range", "" + startFrom + "-" + (f.length() - 1) + "/" + f.length()); return r; } catch (IOException ioe) { return new Response(HTTP_FORBIDDEN, MIME_PLAINTEXT, "FORBIDDEN: Reading file failed."); } } /** * Hashtable mapping (String)FILENAME_EXTENSION -> (String)MIME_TYPE */ private static Hashtable theMimeTypes = new Hashtable(); static { StringTokenizer st = new StringTokenizer("htm text/html " + "html text/html " + "txt text/plain " + "asc text/plain " + "gif image/gif " + "jpg image/jpeg " + "jpeg image/jpeg " + "png image/png " + "mp3 audio/mpeg " + "m3u audio/mpeg-url " + "pdf application/pdf " + "doc application/msword " + "ogg application/x-ogg " + "zip application/octet-stream " + "exe application/octet-stream " + "class application/octet-stream "); while (st.hasMoreTokens()) theMimeTypes.put(st.nextToken(), st.nextToken()); } /** * GMT date formatter */ private static java.text.SimpleDateFormat gmtFrmt; static { gmtFrmt = new java.text.SimpleDateFormat("E, d MMM yyyy HH:mm:ss "GMT"", Locale.US); gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT")); } /** * The distribution licence */ private static final String LICENCE = "Copyright (C) 2001,2005 by Jarno Elonen <elonen@iki.fi>\n" + "\n" + "Redistribution and use in source and binary forms, with or without\n" + "modification, are permitted provided that the following conditions\n" + "are met:\n" + "\n" + "Redistributions of source code must retain the above copyright notice,\n" + "this list of conditions and the following disclaimer. Redistributions in\n" + "binary form must reproduce the above copyright notice, this list of\n" + "conditions and the following disclaimer in the documentation and/or other\n" + "materials provided with the distribution. The name of the author may not\n" + "be used to endorse or promote products derived from this software without\n" + "specific prior written permission. \n" + " \n" + "THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS"" AND ANY EXPRESS OR\n" + "IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n" + "OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n" + "IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n" + "INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n" + "NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n" + "DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n" + "THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n" + "(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n" + "OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";
}
</source>
A web server
<source lang="java">
import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.PrintStream; import java.net.ServerSocket; import java.net.Socket; public class MainClass {
public static void main(String args[]) throws Exception { ServerSocket ss = new ServerSocket(80); while (true) { Socket s = ss.accept(); PrintStream out = new PrintStream(s.getOutputStream()); BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream())); String info = null; while ((info = in.readLine()) != null) { System.out.println("now got " + info); if (info.equals("")) break; } out.println("HTTP/1.0 200 OK"); out.println("MIME_version:1.0"); out.println("Content_Type:text/html");String c = "<html> <head></head><body>
hi
</Body></html>";out.println("Content_Length:" + c.length()); out.println(""); out.println(c); out.close(); s.close(); in.close(); } }
}
</source>
Minimal HTTP Server by using com.sun.net.httpserver.HttpServer
<source lang="java">
import java.io.IOException; import java.io.OutputStream; import java.net.InetSocketAddress; import java.util.List; import java.util.Map; import java.util.Set; import com.sun.net.httpserver.Headers; import com.sun.net.httpserver.HttpExchange; import com.sun.net.httpserver.HttpHandler; import com.sun.net.httpserver.HttpServer; public class MinimalHTTPServer {
public static void main(String[] args) throws IOException { HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0); server.createContext("/echo", new Handler()); server.start(); }
} class Handler implements HttpHandler {
public void handle(HttpExchange xchg) throws IOException { Headers headers = xchg.getRequestHeaders(); Set<Map.Entry<String, List<String>>> entries = headers.entrySet(); StringBuffer response = new StringBuffer(); for (Map.Entry<String, List<String>> entry : entries) response.append(entry.toString() + "\n"); xchg.sendResponseHeaders(200, response.length()); OutputStream os = xchg.getResponseBody(); os.write(response.toString().getBytes()); os.close(); }
}
</source>
POSTing data to an HTTP server
<source lang="java">
import java.io.DataInputStream; import java.io.DataOutputStream; import java.net.URL; import java.net.URLConnection; public class Main {
public static void main(String[] args) throws Exception { URL url = new URL("http://localhost:8080/postedresults.jsp"); URLConnection conn = url.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); conn.setUseCaches(false); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); DataOutputStream out = new DataOutputStream(conn.getOutputStream()); String content = "CONTENT=HELLO JSP !&ONEMORECONTENT =HELLO POST !"; out.writeBytes(content); out.flush(); out.close(); DataInputStream in = new DataInputStream(conn.getInputStream()); String str; while (null != ((str = in.readUTF()))) { System.out.println(str ); } in.close(); }
}
</source>