Java/Network Protocol/Web Server
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>
