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NanoHTTPD源码以及解释
package com.jwzhangjie.shafa.market.remotesetup;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.io.PushbackInputStream;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.net.URLDecoder;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TimeZone;
/**
* A simple, tiny, nicely embeddable HTTP server in Java
* <p/>
* <p/>
* NanoHTTPD
* <p></p>Copyright (c) 2012-2013 by Paul S. Hawke, 2001,2005-2013 by Jarno Elonen, 2010 by Konstantinos Togias</p>
* <p/>
* <p/>
* <b>Features + limitations: </b>
* <ul>
* <p/>
* <li>Only one Java file</li>
* <li>Java 5 compatible</li>
* <li>Released as open source, Modified BSD licence</li>
* <li>No fixed config files, logging, authorization etc. (Implement yourself if you need them.)</li>
* <li>Supports parameter parsing of GET and POST methods (+ rudimentary PUT support in 1.25)</li>
* <li>Supports both dynamic content and file serving</li>
* <li>Supports file upload (since version 1.2, 2010)</li>
* <li>Supports partial content (streaming)</li>
* <li>Supports ETags</li>
* <li>Never caches anything</li>
* <li>Doesn‘t limit bandwidth, request time or simultaneous connections</li>
* <li>Default code serves files and shows all HTTP parameters and headers</li>
* <li>File server supports directory listing, index.html and index.htm</li>
* <li>File server supports partial content (streaming)</li>
* <li>File server supports ETags</li>
* <li>File server does the 301 redirection trick for directories without ‘/‘</li>
* <li>File server supports simple skipping for files (continue download)</li>
* <li>File server serves also very long files without memory overhead</li>
* <li>Contains a built-in list of most common mime types</li>
* <li>All header names are converted lowercase so they don‘t vary between browsers/clients</li>
* <p/>
* </ul>
* <p/>
* <p/>
* <b>How to use: </b>
* <ul>
* <p/>
* <li>Subclass and implement serve() and embed to your own program</li>
* <p/>
* </ul>
* <p/>
* See the separate "LICENSE.md" file for the distribution license (Modified BSD licence)
*/
public abstract class NanoHTTPD {
/**
* Maximum time to wait on Socket.getInputStream().read() (in milliseconds)
* This is required as the Keep-Alive HTTP connections would otherwise
* block the socket reading thread forever (or as long the browser is open).
*/
public static final int SOCKET_READ_TIMEOUT = 5000;
/**
* Common mime type for dynamic content: plain text
*/
public static final String MIME_PLAINTEXT = "text/plain";
/**
* Common mime type for dynamic content: html
*/
public static final String MIME_HTML = "text/html";
/**
* Pseudo-Parameter to use to store the actual query string in the parameters map for later re-processing.
*/
private static final String QUERY_STRING_PARAMETER = "NanoHttpd.QUERY_STRING";
private final String hostname;
private final int myPort;
private ServerSocket myServerSocket;
private Set<Socket> openConnections = new HashSet<Socket>();
private Thread myThread;
/**
* Pluggable strategy for asynchronously executing requests.
*/
private AsyncRunner asyncRunner;
/**
* Pluggable strategy for creating and cleaning up temporary files.
*/
private TempFileManagerFactory tempFileManagerFactory;
/**
* Constructs an HTTP server on given port.
*/
public NanoHTTPD(int port) {
this(null, port);
}
/**
* Constructs an HTTP server on given hostname and port.
*/
public NanoHTTPD(String hostname, int port) {
this.hostname = hostname;
this.myPort = port;
setTempFileManagerFactory(new DefaultTempFileManagerFactory());
setAsyncRunner(new DefaultAsyncRunner());
}
private static final void safeClose(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException e) {
}
}
}
private static final void safeClose(Socket closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException e) {
}
}
}
private static final void safeClose(ServerSocket closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException e) {
}
}
}
/**
* Start the server.
*
* @throws IOException if the socket is in use.
*/
public void start() throws IOException {
myServerSocket = new ServerSocket();
myServerSocket.bind((hostname != null) ? new InetSocketAddress(hostname, myPort) : new InetSocketAddress(myPort));
myThread = new Thread(new Runnable() {
@Override
public void run() {
do {
try {
final Socket finalAccept = myServerSocket.accept();
registerConnection(finalAccept);
finalAccept.setSoTimeout(SOCKET_READ_TIMEOUT);
final InputStream inputStream = finalAccept.getInputStream();
asyncRunner.exec(new Runnable() {
@Override
public void run() {
OutputStream outputStream = null;
try {
outputStream = finalAccept.getOutputStream();
TempFileManager tempFileManager = tempFileManagerFactory.create();
HTTPSession session = new HTTPSession(tempFileManager, inputStream, outputStream, finalAccept.getInetAddress());
while (!finalAccept.isClosed()) {
session.execute();
}
} catch (Exception e) {
// When the socket is closed by the client, we throw our own SocketException
// to break the "keep alive" loop above.
if (!(e instanceof SocketException && "NanoHttpd Shutdown".equals(e.getMessage()))) {
e.printStackTrace();
}
} finally {
safeClose(outputStream);
safeClose(inputStream);
safeClose(finalAccept);
unRegisterConnection(finalAccept);
}
}
});
} catch (IOException e) {
}
} while (!myServerSocket.isClosed());
}
});
myThread.setDaemon(true);
myThread.setName("NanoHttpd Main Listener");
myThread.start();
}
/**
* Stop the server.
*/
public void stop() {
try {
safeClose(myServerSocket);
closeAllConnections();
myThread.join();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Registers that a new connection has been set up.
*
* @param socket
* the {@link Socket} for the connection.
*/
public synchronized void registerConnection(Socket socket) {
openConnections.add(socket);
}
/**
* Registers that a connection has been closed
*
* @param socket
* the {@link Socket} for the connection.
*/
public synchronized void unRegisterConnection(Socket socket) {
openConnections.remove(socket);
}
/**
* Forcibly closes all connections that are open.
*/
public synchronized void closeAllConnections() {
for (Socket socket : openConnections) {
safeClose(socket);
}
}
public final int getListeningPort() {
return myServerSocket == null ? -1 : myServerSocket.getLocalPort();
}
public final boolean wasStarted() {
return myServerSocket != null && myThread != null;
}
public final boolean isAlive() {
return wasStarted() && !myServerSocket.isClosed() && myThread.isAlive();
}
/**
* Override this to customize the server.
* <p/>
* <p/>
* (By default, this delegates to serveFile() and allows directory listing.)
*
* @param uri Percent-decoded URI without parameters, for example "/index.cgi"
* @param method "GET", "POST" etc.
* @param parms Parsed, percent decoded parameters from URI and, in case of POST, data.
* @param headers Header entries, percent decoded
* @return HTTP response, see class Response for details
*/
@Deprecated
public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> parms,
Map<String, String> files) {
return new Response(Response.Status.NOT_FOUND, MIME_PLAINTEXT, "Not Found");
}
/**
* Override this to customize the server.
* <p/>
* <p/>
* (By default, this delegates to serveFile() and allows directory listing.)
*
* @param session The HTTP session
* @return HTTP response, see class Response for details
* 我们需要自己实现这个方法
*/
public Response serve(IHTTPSession session) {
Map<String, String> files = new HashMap<String, String>();
Method method = session.getMethod();
if (Method.PUT.equals(method) || Method.POST.equals(method)) {
try {
session.parseBody(files);
} catch (IOException ioe) {
return new Response(Response.Status.INTERNAL_ERROR, MIME_PLAINTEXT, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
} catch (ResponseException re) {
return new Response(re.getStatus(), MIME_PLAINTEXT, re.getMessage());
}
}
Map<String, String> parms = session.getParms();
parms.put(QUERY_STRING_PARAMETER, session.getQueryParameterString());
return serve(session.getUri(), method, session.getHeaders(), parms, files);
}
/**
* Decode percent encoded <code>String</code> values.
*
* @param str the percent encoded <code>String</code>
* @return expanded form of the input, for example "foo%20bar" becomes "foo bar"
*/
protected String decodePercent(String str) {
String decoded = null;
try {
decoded = URLDecoder.decode(str, "UTF8");
} catch (UnsupportedEncodingException ignored) {
}
return decoded;
}
/**
* Decode parameters from a URL, handing the case where a single parameter name might have been
* supplied several times, by return lists of values. In general these lists will contain a single
* element.
*
* @param parms original <b>NanoHttpd</b> parameters values, as passed to the <code>serve()</code> method.
* @return a map of <code>String</code> (parameter name) to <code>List<String></code> (a list of the values supplied).
*/
protected Map<String, List<String>> decodeParameters(Map<String, String> parms) {
return this.decodeParameters(parms.get(QUERY_STRING_PARAMETER));
}
/**
* Decode parameters from a URL, handing the case where a single parameter name might have been
* supplied several times, by return lists of values. In general these lists will contain a single
* element.
*
* @param queryString a query string pulled from the URL.
* @return a map of <code>String</code> (parameter name) to <code>List<String></code> (a list of the values supplied).
*/
protected Map<String, List<String>> decodeParameters(String queryString) {
Map<String, List<String>> parms = new HashMap<String, List<String>>();
if (queryString != null) {
StringTokenizer st = new StringTokenizer(queryString, "&");
while (st.hasMoreTokens()) {
String e = st.nextToken();
int sep = e.indexOf(‘=‘);
String propertyName = (sep >= 0) ? decodePercent(e.substring(0, sep)).trim() : decodePercent(e).trim();
if (!parms.containsKey(propertyName)) {
parms.put(propertyName, new ArrayList<String>());
}
String propertyValue = (sep >= 0) ? decodePercent(e.substring(sep + 1)) : null;
if (propertyValue != null) {
parms.get(propertyName).add(propertyValue);
}
}
}
return parms;
}
// ------------------------------------------------------------------------------- //
//
// Threading Strategy.
//
// ------------------------------------------------------------------------------- //
/**
* Pluggable strategy for asynchronously executing requests.
*
* @param asyncRunner new strategy for handling threads.
*/
public void setAsyncRunner(AsyncRunner asyncRunner) {
this.asyncRunner = asyncRunner;
}
// ------------------------------------------------------------------------------- //
//
// Temp file handling strategy.
//
// ------------------------------------------------------------------------------- //
/**
* Pluggable strategy for creating and cleaning up temporary files.
*
* @param tempFileManagerFactory new strategy for handling temp files.
*/
public void setTempFileManagerFactory(TempFileManagerFactory tempFileManagerFactory) {
this.tempFileManagerFactory = tempFileManagerFactory;
}
/**
* HTTP Request methods, with the ability to decode a <code>String</code> back to its enum value.
*/
public enum Method {
GET, PUT, POST, DELETE, HEAD, OPTIONS;
static Method lookup(String method) {
for (Method m : Method.values()) {
if (m.toString().equalsIgnoreCase(method)) {
return m;
}
}
return null;
}
}
/**
* Pluggable strategy for asynchronously executing requests.
*/
public interface AsyncRunner {
void exec(Runnable code);
}
/**
* Factory to create temp file managers.
*/
public interface TempFileManagerFactory {
TempFileManager create();
}
// ------------------------------------------------------------------------------- //
/**
* Temp file manager.
* <p/>
* <p>Temp file managers are created 1-to-1 with incoming requests, to create and cleanup
* temporary files created as a result of handling the request.</p>
*/
public interface TempFileManager {
TempFile createTempFile() throws Exception;
void clear();
}
/**
* A temp file.
* <p/>
* <p>Temp files are responsible for managing the actual temporary storage and cleaning
* themselves up when no longer needed.</p>
*/
public interface TempFile {
OutputStream open() throws Exception;
void delete() throws Exception;
String getName();
}
/**
* Default threading strategy for NanoHttpd.
* <p/>
* <p>By default, the server spawns a new Thread for every incoming request. These are set
* to <i>daemon</i> status, and named according to the request number. The name is
* useful when profiling the application.</p>
*/
public static class DefaultAsyncRunner implements AsyncRunner {
private long requestCount;
@Override
public void exec(Runnable code) {
++requestCount;
Thread t = new Thread(code);
t.setDaemon(true);
t.setName("NanoHttpd Request Processor (#" + requestCount + ")");
t.start();
}
}
/**
* Default strategy for creating and cleaning up temporary files.
* <p/>
* <p></p>This class stores its files in the standard location (that is,
* wherever <code>java.io.tmpdir</code> points to). Files are added
* to an internal list, and deleted when no longer needed (that is,
* when <code>clear()</code> is invoked at the end of processing a
* request).</p>
*/
public static class DefaultTempFileManager implements TempFileManager {
private final String tmpdir;
private final List<TempFile> tempFiles;
public DefaultTempFileManager() {
tmpdir = System.getProperty("java.io.tmpdir");
tempFiles = new ArrayList<TempFile>();
}
@Override
public TempFile createTempFile() throws Exception {
DefaultTempFile tempFile = new DefaultTempFile(tmpdir);
tempFiles.add(tempFile);
return tempFile;
}
@Override
public void clear() {
for (TempFile file : tempFiles) {
try {
file.delete();
} catch (Exception ignored) {
}
}
tempFiles.clear();
}
}
/**
* Default strategy for creating and cleaning up temporary files.
* <p/>
* <p></p></[>By default, files are created by <code>File.createTempFile()</code> in
* the directory specified.</p>
*/
public static class DefaultTempFile implements TempFile {
private File file;
private OutputStream fstream;
public DefaultTempFile(String tempdir) throws IOException {
file = File.createTempFile("NanoHTTPD-", "", new File(tempdir));
fstream = new FileOutputStream(file);
}
@Override
public OutputStream open() throws Exception {
return fstream;
}
@Override
public void delete() throws Exception {
safeClose(fstream);
file.delete();
}
@Override
public String getName() {
return file.getAbsolutePath();
}
}
/**
* HTTP response. Return one of these from serve().
*/
public static class Response {
/**
* HTTP status code after processing, e.g. "200 OK", HTTP_OK
*/
private Status status;
/**
* MIME type of content, e.g. "text/html"
*/
private String mimeType;
/**
* Data of the response, may be null.
*/
private InputStream data;
/**
* Headers for the HTTP response. Use addHeader() to add lines.
*/
private Map<String, String> header = new HashMap<String, String>();
/**
* The request method that spawned this response.
*/
private Method requestMethod;
/**
* Use chunkedTransfer
*/
private boolean chunkedTransfer;
/**
* Default constructor: response = HTTP_OK, mime = MIME_HTML and your supplied message
*/
public Response(String msg) {
this(Status.OK, MIME_HTML, msg);
}
/**
* Basic constructor.
*/
public Response(Status 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(Status status, String mimeType, String txt) {
this.status = status;
this.mimeType = mimeType;
try {
this.data = txt != null ? new ByteArrayInputStream(txt.getBytes("UTF-8")) : null;
} catch (java.io.UnsupportedEncodingException uee) {
uee.printStackTrace();
}
}
/**
* Adds given line to the header.
*/
public void addHeader(String name, String value) {
header.put(name, value);
}
/**
* Sends given response to the socket.
*/
private void send(OutputStream outputStream) {
String mime = mimeType;
SimpleDateFormat gmtFrmt = new SimpleDateFormat("E, d MMM yyyy HH:mm:ss ‘GMT‘", Locale.US);
gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT"));
try {
if (status == null) {
throw new Error("sendResponse(): Status can‘t be null.");
}
PrintWriter pw = new PrintWriter(outputStream);
pw.print("HTTP/1.1 " + status.getDescription() + " \r\n");
if (mime != null) {
pw.print("Content-Type: " + mime + "\r\n");
}
if (header == null || header.get("Date") == null) {
pw.print("Date: " + gmtFrmt.format(new Date()) + "\r\n");
}
if (header != null) {
for (String key : header.keySet()) {
String value = header.get(key);
pw.print(key + ": " + value + "\r\n");
}
}
pw.print("Connection: keep-alive\r\n");
if (requestMethod != Method.HEAD && chunkedTransfer) {
sendAsChunked(outputStream, pw);
} else {
sendAsFixedLength(outputStream, pw);
}
outputStream.flush();
safeClose(data);
} catch (IOException ioe) {
// Couldn‘t write? No can do.
}
}
private void sendAsChunked(OutputStream outputStream, PrintWriter pw) throws IOException {
pw.print("Transfer-Encoding: chunked\r\n");
pw.print("\r\n");
pw.flush();
int BUFFER_SIZE = 16 * 1024;
byte[] CRLF = "\r\n".getBytes();
byte[] buff = new byte[BUFFER_SIZE];
int read;
while ((read = data.read(buff)) > 0) {
outputStream.write(String.format("%x\r\n", read).getBytes());
outputStream.write(buff, 0, read);
outputStream.write(CRLF);
}
outputStream.write(String.format("0\r\n\r\n").getBytes());
}
private void sendAsFixedLength(OutputStream outputStream, PrintWriter pw) throws IOException {
int pending = data != null ? data.available() : 0; // This is to support partial sends, see serveFile()
pw.print("Content-Length: "+pending+"\r\n");
pw.print("\r\n");
pw.flush();
if (requestMethod != Method.HEAD && data != null) {
int BUFFER_SIZE = 16 * 1024;
byte[] buff = new byte[BUFFER_SIZE];
while (pending > 0) {
int read = data.read(buff, 0, ((pending > BUFFER_SIZE) ? BUFFER_SIZE : pending));
if (read <= 0) {
break;
}
outputStream.write(buff, 0, read);
pending -= read;
}
}
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
public String getMimeType() {
return mimeType;
}
public void setMimeType(String mimeType) {
this.mimeType = mimeType;
}
public InputStream getData() {
return data;
}
public void setData(InputStream data) {
this.data = data;
}
public Method getRequestMethod() {
return requestMethod;
}
public void setRequestMethod(Method requestMethod) {
this.requestMethod = requestMethod;
}
public void setChunkedTransfer(boolean chunkedTransfer) {
this.chunkedTransfer = chunkedTransfer;
}
/**
* Some HTTP response status codes
*/
public enum Status {
OK(200, "OK"), CREATED(201, "Created"), ACCEPTED(202, "Accepted"), NO_CONTENT(204, "No Content"), PARTIAL_CONTENT(206, "Partial Content"), REDIRECT(301,
"Moved Permanently"), NOT_MODIFIED(304, "Not Modified"), BAD_REQUEST(400, "Bad Request"), UNAUTHORIZED(401,
"Unauthorized"), FORBIDDEN(403, "Forbidden"), NOT_FOUND(404, "Not Found"), METHOD_NOT_ALLOWED(405, "Method Not Allowed"), RANGE_NOT_SATISFIABLE(416,
"Requested Range Not Satisfiable"), INTERNAL_ERROR(500, "Internal Server Error");
private final int requestStatus;
private final String description;
Status(int requestStatus, String description) {
this.requestStatus = requestStatus;
this.description = description;
}
public int getRequestStatus() {
return this.requestStatus;
}
public String getDescription() {
return "" + this.requestStatus + " " + description;
}
}
}
public static final class ResponseException extends Exception {
private final Response.Status status;
public ResponseException(Response.Status status, String message) {
super(message);
this.status = status;
}
public ResponseException(Response.Status status, String message, Exception e) {
super(message, e);
this.status = status;
}
public Response.Status getStatus() {
return status;
}
}
/**
* Default strategy for creating and cleaning up temporary files.
*/
private class DefaultTempFileManagerFactory implements TempFileManagerFactory {
@Override
public TempFileManager create() {
return new DefaultTempFileManager();
}
}
/**
* Handles one session, i.e. parses the HTTP request and returns the response.
*/
public interface IHTTPSession {
void execute() throws IOException;
Map<String, String> getParms();
Map<String, String> getHeaders();
/**
* @return the path part of the URL.
*/
String getUri();
String getQueryParameterString();
Method getMethod();
InputStream getInputStream();
CookieHandler getCookies();
/**
* Adds the files in the request body to the files map.
* @arg files - map to modify
*/
void parseBody(Map<String, String> files) throws IOException, ResponseException;
}
protected class HTTPSession implements IHTTPSession {
public static final int BUFSIZE = 8192;
private final TempFileManager tempFileManager;
private final OutputStream outputStream;
private PushbackInputStream inputStream;
private int splitbyte;
private int rlen;
private String uri;
private Method method;
private Map<String, String> parms;
private Map<String, String> headers;
private CookieHandler cookies;
private String queryParameterString;
public HTTPSession(TempFileManager tempFileManager, InputStream inputStream, OutputStream outputStream) {
this.tempFileManager = tempFileManager;
this.inputStream = new PushbackInputStream(inputStream, BUFSIZE);
this.outputStream = outputStream;
}
public HTTPSession(TempFileManager tempFileManager, InputStream inputStream, OutputStream outputStream, InetAddress inetAddress) {
this.tempFileManager = tempFileManager;
this.inputStream = new PushbackInputStream(inputStream, BUFSIZE);
this.outputStream = outputStream;
String remoteIp = inetAddress.isLoopbackAddress() || inetAddress.isAnyLocalAddress() ? "127.0.0.1" : inetAddress.getHostAddress().toString();
headers = new HashMap<String, String>();
headers.put("remote-addr", remoteIp);
headers.put("http-client-ip", remoteIp);
}
@Override
public void execute() throws IOException {
try {
/* Read the first 8192 bytes.
The full header should fit in here.
Apache‘s default header limit is 8KB.
Do NOT assume that a single read will get the entire header at once!
header的最大长度为8192bytes，所以这里设置BUFSIZE为8192bytes
*/
byte[] buf = new byte[BUFSIZE];
splitbyte = 0;
rlen = 0;//总共的长度
{
int read = -1;//每次读取的长度
try {
read = inputStream.read(buf, 0, BUFSIZE);
} catch (Exception e) {
safeClose(inputStream);
safeClose(outputStream);
throw new SocketException("NanoHttpd Shutdown");
}
if (read == -1) {
// socket was been closed
safeClose(inputStream);
safeClose(outputStream);
throw new SocketException("NanoHttpd Shutdown");
}
while (read > 0) {
rlen += read;
splitbyte = findHeaderEnd(buf, rlen);
if (splitbyte > 0)//如果返回0则说明没有找到
break;
read = inputStream.read(buf, rlen, BUFSIZE - rlen);
}
}
//如果读多了，则将多余的部分重新写到流里面
if (splitbyte < rlen) {
inputStream.unread(buf, splitbyte, rlen - splitbyte);
}
parms = new HashMap<String, String>();
if(null == headers) {
headers = new HashMap<String, String>();
}
// Create a BufferedReader for parsing the header.
BufferedReader hin = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(buf, 0, rlen)));
// Decode the header into parms and header java properties
Map<String, String> pre = new HashMap<String, String>();
decodeHeader(hin, pre, parms, headers);
/**
* 取出客户端请求的方式：GET/POST
*/
method = Method.lookup(pre.get("method"));
if (method == null) {
throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Syntax error.");
}
//请求的连接
uri = pre.get("uri");
cookies = new CookieHandler(headers);
/*
* Ok, now do the serve()
* 解析
*/
Response r = serve(this);
if (r == null) {
throw new ResponseException(Response.Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: Serve() returned a null response.");
} else {
cookies.unloadQueue(r);
//响应客户端信息
r.setRequestMethod(method);
r.send(outputStream);
}
} catch (SocketException e) {
// throw it out to close socket object (finalAccept)
throw e;
} catch (SocketTimeoutException ste) {
throw ste;
} catch (IOException ioe) {
Response r = new Response(Response.Status.INTERNAL_ERROR, MIME_PLAINTEXT, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
r.send(outputStream);
safeClose(outputStream);
} catch (ResponseException re) {
Response r = new Response(re.getStatus(), MIME_PLAINTEXT, re.getMessage());
r.send(outputStream);
safeClose(outputStream);
} finally {
tempFileManager.clear();
}
}
@Override
public void parseBody(Map<String, String> files) throws IOException, ResponseException {
RandomAccessFile randomAccessFile = null;
BufferedReader in = null;
try {
//创建临时文件
randomAccessFile = getTmpBucket();
long size;
if (headers.containsKey("content-length")) {
size = Integer.parseInt(headers.get("content-length"));
} else if (splitbyte < rlen) {
size = rlen - splitbyte;
} else {
size = 0;
}
/*
* Now read all the body and write it to f
* 将流的内容写到临时文件中
*/
byte[] buf = new byte[512];
while (rlen >= 0 && size > 0) {
rlen = inputStream.read(buf, 0, (int)Math.min(size, 512));
size -= rlen;
if (rlen > 0) {
randomAccessFile.write(buf, 0, rlen);
}
}
// Get the raw body as a byte []
ByteBuffer fbuf = randomAccessFile.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, randomAccessFile.length());
randomAccessFile.seek(0);//重新定位到临时文件的开始位置
// Create a BufferedReader for easily reading it as string.
InputStream bin = new FileInputStream(randomAccessFile.getFD());
in = new BufferedReader(new InputStreamReader(bin));
// If the method is POST, there may be parameters
// in data section, too, read it:
if (Method.POST.equals(method)) {
String contentType = "";
String contentTypeHeader = headers.get("content-type");
StringTokenizer st = null;
if (contentTypeHeader != null) {
st = new StringTokenizer(contentTypeHeader, ",; ");
if (st.hasMoreTokens()) {
contentType = st.nextToken();
}
}
//表单提交，文件上传类型
if ("multipart/form-data".equalsIgnoreCase(contentType)) {
// Handle multipart/form-data
if (!st.hasMoreTokens()) {
throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but boundary missing. Usage: GET /example/file.html");
}
String boundaryStartString = "boundary=";
int boundaryContentStart = contentTypeHeader.indexOf(boundaryStartString) + boundaryStartString.length();
String boundary = contentTypeHeader.substring(boundaryContentStart, contentTypeHeader.length());
if (boundary.startsWith("\"") && boundary.endsWith("\"")) {
boundary = boundary.substring(1, boundary.length() - 1);
}
//fbuf里面包含body的内容
decodeMultipartData(boundary, fbuf, in, parms, files);
} else {
// Handle application/x-www-form-urlencoded
String postLine = "";
StringBuilder postLineBuffer = new StringBuilder();
char pbuf[] = new char[512];
int read = in.read(pbuf);
while (read >= 0 && !postLine.endsWith("\r\n")) {
postLine = String.valueOf(pbuf, 0, read);
postLineBuffer.append(postLine);
read = in.read(pbuf);
}
postLine = postLineBuffer.toString().trim();
decodeParms(postLine, parms);
}
} else if (Method.PUT.equals(method)) {
String content = saveTmpFile(fbuf, 0, fbuf.limit());
files.put("content", content);
}
} finally {
safeClose(randomAccessFile);
safeClose(in);
}
}
/**
* Decodes the sent headers and loads the data into Key/value pairs
*/
private void decodeHeader(BufferedReader in, Map<String, String> pre, Map<String, String> parms, Map<String, String> headers)
throws ResponseException {
try {
// Read the request line GET / HTTP/1.1
String inLine = in.readLine();
if (inLine == null) {
return;
}
//分隔inLine用 \t\n\r\f
StringTokenizer st = new StringTokenizer(inLine);
if (!st.hasMoreTokens()) {
throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html");
}
String method = st.nextToken();
pre.put("method", method);
if (!st.hasMoreTokens()) {
throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html");
}
String uri = st.nextToken();
/*
* Decode parameters from the URI
* 以"?" 来判断是否有参数
*/
int qmi = uri.indexOf(‘?‘);
if (qmi >= 0) {//说明有参数，调用decodeParms将参数解析到parms中
decodeParms(uri.substring(qmi + 1), parms);
uri = decodePercent(uri.substring(0, qmi));
} else {
uri = decodePercent(uri);
}
// If there‘s another token, it‘s protocol version,
// followed by HTTP headers. Ignore version but parse headers.
// NOTE: this now forces header names lowercase since they are
// case insensitive and vary by client.
if (st.hasMoreTokens()) {
String line = in.readLine();
while (line != null && line.trim().length() > 0) {
int p = line.indexOf(‘:‘);
if (p >= 0)
headers.put(line.substring(0, p).trim().toLowerCase(Locale.US), line.substring(p + 1).trim());
line = in.readLine();
}
}
pre.put("uri", uri);
} catch (IOException ioe) {
throw new ResponseException(Response.Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage(), ioe);
}
}
/**
* Decodes the Multipart Body data and put it into Key/Value pairs.
* @param boundary
* @param fbuf
* @param in
* @param parms header头里面的参数
* @param files 支持多文件上传功能
* @throws ResponseException
*/
private void decodeMultipartData(String boundary, ByteBuffer fbuf, BufferedReader in, Map<String, String> parms,
Map<String, String> files) throws ResponseException {
try {
//根据boundary获取分割线与内容的间隔位置
int[] bpositions = getBoundaryPositions(fbuf, boundary.getBytes());
int boundarycount = 2;//源码为1，如果是上传单个文件会有问题
String mpline = in.readLine();
while (mpline != null) {
if (!mpline.contains(boundary)) {
throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but next chunk does not start with boundary. Usage: GET /example/file.html");
}
boundarycount++;
Map<String, String> item = new HashMap<String, String>();
mpline = in.readLine();
while (mpline != null && mpline.trim().length() > 0) {
int p = mpline.indexOf(‘:‘);
if (p != -1) {
item.put(mpline.substring(0, p).trim().toLowerCase(Locale.US), mpline.substring(p + 1).trim());
}
mpline = in.readLine();
}
if (mpline != null) {
String contentDisposition = item.get("content-disposition");
if (contentDisposition == null) {
throw new ResponseException(Response.Status.BAD_REQUEST, "BAD REQUEST: Content type is multipart/form-data but no content-disposition info found. Usage: GET /example/file.html");
}
StringTokenizer st = new StringTokenizer(contentDisposition, "; ");
Map<String, String> disposition = new HashMap<String, String>();
while (st.hasMoreTokens()) {
String token = st.nextToken();
int p = token.indexOf(‘=‘);
if (p != -1) {
disposition.put(token.substring(0, p).trim().toLowerCase(Locale.US), token.substring(p + 1).trim());
}
}
String pname = disposition.get("name");
pname = pname.substring(1, pname.length() - 1);
String value = "";
if (item.get("content-type") == null) {
while (mpline != null && !mpline.contains(boundary)) {
mpline = in.readLine();
if (mpline != null) {
int d = mpline.indexOf(boundary);
if (d == -1) {
value += mpline;
} else {
value += mpline.substring(0, d - 2);
}
}
}
} else {
if (boundarycount > bpositions.length) {
throw new ResponseException(Response.Status.INTERNAL_ERROR, "Error processing request");
}
int offset = stripMultipartHeaders(fbuf, bpositions[boundarycount - 2]);
//创建一个临时文件，然后保存内容，这个函数我们也需要重写setTempFileManagerFactory
String path = saveTmpFile(fbuf, offset, bpositions[boundarycount - 1] - offset - 4);
files.put(pname, path);
value = disposition.get("filename");
value = value.substring(1, value.length() - 1);
do {
mpline = in.readLine();
} while (mpline != null && !mpline.contains(boundary));
}
parms.put(pname, value);
}
}
} catch (IOException ioe) {
throw new ResponseException(Response.Status.INTERNAL_ERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage(), ioe);
}
}
/**
* Find byte index separating header from body. It must be the last byte of the first two sequential new lines.
* 找到head和body的分界点，两个回车换行
*/
private int findHeaderEnd(final byte[] buf, int rlen) {
int splitbyte = 0;
while (splitbyte + 3 < rlen) {
if (buf[splitbyte] == ‘\r‘ && buf[splitbyte + 1] == ‘\n‘ && buf[splitbyte + 2] == ‘\r‘ && buf[splitbyte + 3] == ‘\n‘) {
return splitbyte + 4;
}
splitbyte++;
}
return 0;
}
/**
* Find the byte positions where multipart boundaries start.
* @param b
* @param boundary
* @return
*/
private int[] getBoundaryPositions(ByteBuffer b, byte[] boundary) {
int matchcount = 0;
int matchbyte = -1;
List<Integer> matchbytes = new ArrayList<Integer>();
for (int i = 0; i < b.limit(); i++) {
if (b.get(i) == boundary[matchcount]) {
if (matchcount == 0)
matchbyte = i;
matchcount++;
if (matchcount == boundary.length) {
matchbytes.add(matchbyte);
matchcount = 0;
matchbyte = -1;
}
} else {
i -= matchcount;
matchcount = 0;
matchbyte = -1;
}
}
int[] ret = new int[matchbytes.size()];
for (int i = 0; i < ret.length; i++) {
ret[i] = matchbytes.get(i);
}
return ret;
}
/**
* Retrieves the content of a sent file and saves it to a temporary file. The full path to the saved file is returned.
*/
private String saveTmpFile(ByteBuffer b, int offset, int len) {
String path = "";
if (len > 0) {
FileOutputStream fileOutputStream = null;
try {
//这个地方的tempFileManager需要我们setTempFileManagerFactory
TempFile tempFile = tempFileManager.createTempFile();
ByteBuffer src = b.duplicate();
fileOutputStream = new FileOutputStream(tempFile.getName());
FileChannel dest = fileOutputStream.getChannel();
src.position(offset).limit(offset + len);
dest.write(src.slice());
path = tempFile.getName();
} catch (Exception e) { // Catch exception if any
System.err.println("Error: " + e.getMessage());
} finally {
safeClose(fileOutputStream);
}
}
return path;
}
private RandomAccessFile getTmpBucket() {
try {
TempFile tempFile = tempFileManager.createTempFile();
return new RandomAccessFile(tempFile.getName(), "rw");
} catch (Exception e) {
System.err.println("Error: " + e.getMessage());
}
return null;
}
/**
* It returns the offset separating multipart file headers from the file‘s data.
*/
private int stripMultipartHeaders(ByteBuffer b, int offset) {
int i;
for (i = offset; i < b.limit(); i++) {
if (b.get(i) == ‘\r‘ && b.get(++i) == ‘\n‘ && b.get(++i) == ‘\r‘ && b.get(++i) == ‘\n‘) {
break;
}
}
return i + 1;
}
/**
* Decodes parameters in percent-encoded URI-format ( e.g. "name=Jack%20Daniels&pass=Single%20Malt" ) and
* adds them to given Map. NOTE: this doesn‘t support multiple identical keys due to the simplicity of Map.
*/
private void decodeParms(String parms, Map<String, String> p) {
if (parms == null) {
queryParameterString = "";
return;
}
queryParameterString = parms;
//使用&来分隔参数
StringTokenizer st = new StringTokenizer(parms, "&");
while (st.hasMoreTokens()) {
String e = st.nextToken();
int sep = e.indexOf(‘=‘);
if (sep >= 0) {
/*
* 这里使用decodePercent来解析，防止参数里面带有中文
* 比如“张杰”那么浏览器会写成%E5%BC%A0%E6%9D%B0
*/
p.put(decodePercent(e.substring(0, sep)).trim(),
decodePercent(e.substring(sep + 1)));
} else {
p.put(decodePercent(e).trim(), "");
}
}
}
@Override
public final Map<String, String> getParms() {
return parms;
}
public String getQueryParameterString() {
return queryParameterString;
}
@Override
public final Map<String, String> getHeaders() {
return headers;
}
@Override
public final String getUri() {
return uri;
}
@Override
public final Method getMethod() {
return method;
}
@Override
public final InputStream getInputStream() {
return inputStream;
}
@Override
public CookieHandler getCookies() {
return cookies;
}
}
public static class Cookie {
private String n, v, e;
public Cookie(String name, String value, String expires) {
n = name;
v = value;
e = expires;
}
public Cookie(String name, String value) {
this(name, value, 30);
}
public Cookie(String name, String value, int numDays) {
n = name;
v = value;
e = getHTTPTime(numDays);
}
public String getHTTPHeader() {
String fmt = "%s=%s; expires=%s";
return String.format(fmt, n, v, e);
}
public static String getHTTPTime(int days) {
Calendar calendar = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
calendar.add(Calendar.DAY_OF_MONTH, days);
return dateFormat.format(calendar.getTime());
}
}
/**
* Provides rudimentary support for cookies.
* Doesn‘t support ‘path‘, ‘secure‘ nor ‘httpOnly‘.
* Feel free to improve it and/or add unsupported features.
*
* @author LordFokas
*/
public class CookieHandler implements Iterable<String> {
private HashMap<String, String> cookies = new HashMap<String, String>();
private ArrayList<Cookie> queue = new ArrayList<Cookie>();
public CookieHandler(Map<String, String> httpHeaders) {
String raw = httpHeaders.get("cookie");
if (raw != null) {
String[] tokens = raw.split(";");
for (String token : tokens) {
String[] data = token.trim().split("=");
if (data.length == 2) {
cookies.put(data[0], data[1]);
}
}
}
}
@Override public Iterator<String> iterator() {
return cookies.keySet().iterator();
}
/**
* Read a cookie from the HTTP Headers.
*
* @param name The cookie‘s name.
* @return The cookie‘s value if it exists, null otherwise.
*/
public String read(String name) {
return cookies.get(name);
}
/**
* Sets a cookie.
*
* @param name The cookie‘s name.
* @param value The cookie‘s value.
* @param expires How many days until the cookie expires.
*/
public void set(String name, String value, int expires) {
queue.add(new Cookie(name, value, Cookie.getHTTPTime(expires)));
}
public void set(Cookie cookie) {
queue.add(cookie);
}
/**
* Set a cookie with an expiration date from a month ago, effectively deleting it on the client side.
*
* @param name The cookie name.
*/
public void delete(String name) {
set(name, "-delete-", -30);
}
/**
* Internally used by the webserver to add all queued cookies into the Response‘s HTTP Headers.
*
* @param response The Response object to which headers the queued cookies will be added.
*/
public void unloadQueue(Response response) {
for (Cookie cookie : queue) {
response.addHeader("Set-Cookie", cookie.getHTTPHeader());
}
}
}
}
NanoHTTPD流程
NanoHTTPD是一个抽象类，所以要继承NanoHTTPD，然后调用start()，在start()方法里面主要实现ServerSocket，然后等待客户端的连接，当有客户端连接的时候，myServerSocket.accept()获取socket实例，然后实例化InputStream和OutputStream，然后传递给HTTPSession类，在其execute()方法中 进行解析HTTP的header和body。
header解析
header和body直接使用两个回车换行符来间隔，由于Header的最大长度为8k，所以创建了一个8k的缓冲，来读取header，splitbyte = findHeaderEnd(buf, rlen);直到splitbyte 返回值大于0,说明已经知道分隔点，如果读取的长度大于splitbyte
，则把多余的部分回写到流里面，然后创建一个BufferedReader来解析头部数据调用decodeHeader方法
body解析
对于body的解析根据请求的方法分为PUT/POST，对于POST方法，使用serve方法来解析body，而serve这个方法也是我们实现NanoHTTPD类所要重写的方法，parseBody来真正解析body，首先创建一个临时文件把流里面的数据写到这个临时文件中，然后实例化ByteBuffer和BufferedReader，如果提交表单的类型是multipart/form-data，查询boundary，而boundary=就是内容数据的分割点，使用decodeMultipartData方法分离参数和内容数据，最后调用saveTmpFile方法来保存文件，为了保存到我们的本地文件中，所以我们还需要TempFileManagerFactory和TempFileManager，TempFileManager用来创建一个本地文件，用来存储真正的上传数据。
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