Comment stocker une Réponse Http qui peuvent contenir des données binaires?

Comme je l'ai décrit dans une précédente question, j'ai une mission à écrire un serveur proxy. Il a partiellement fonctionne maintenant, mais j'ai encore un problème avec la manipulation du format de l'information. - Je stocker les HttpResponse dans une Chaîne de caractères, et il semble que je ne peux pas le faire avec le format de contenu. Cependant, les en-têtes sont texte dont j'ai besoin pour analyser, et ils viennent tous de la même InputStream. Ma question est, que dois-je faire pour gérer correctement les réponses binaires, tout en continuant de l'analyse les en-têtes comme des chaînes de caractères?

>> voir l'édition ci-dessous avant de regarder le code.

Voici la Response implémentation de la classe:

public class Response {
private String fullResponse = "";
private BufferedReader reader;
private boolean busy = true;
private int responseCode;
private CacheControl cacheControl;
public Response(String input) {
this(new ByteArrayInputStream(input.getBytes()));
}
public Response(InputStream input) {
reader = new BufferedReader(new InputStreamReader(input));
try {
while (!reader.ready());//wait for initialization.
String line;
while ((line = reader.readLine()) != null) {
fullResponse += "\r\n" + line;
if (HttpPatterns.RESPONSE_CODE.matches(line)) {
responseCode = (Integer) HttpPatterns.RESPONSE_CODE.process(line);
} else if (HttpPatterns.CACHE_CONTROL.matches(line)) {
cacheControl = (CacheControl) HttpPatterns.CACHE_CONTROL.process(line);
}
}
reader.close();
fullResponse = "\r\n" + fullResponse.trim() + "\r\n\r\n";
} catch (IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
} 
busy = false;
}
public CacheControl getCacheControl() {
return cacheControl;
}
public String getFullResponse() {
return fullResponse;
}
public boolean isBusy() {
return busy;
}
public int getResponseCode() {
return responseCode;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((fullResponse == null) ? 0 : fullResponse.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof Response))
return false;
Response other = (Response) obj;
if (fullResponse == null) {
if (other.fullResponse != null)
return false;
} else if (!fullResponse.equals(other.fullResponse))
return false;
return true;
}
@Override
public String toString() {
return "Response\n==============================\n" + fullResponse;
}
}

Et voici HttpPatterns:

public enum HttpPatterns {
RESPONSE_CODE("^HTTP/1\\.1 (\\d+) .*$"),
CACHE_CONTROL("^Cache-Control: (\\w+)$"),
HOST("^Host: (\\w+)$"),
REQUEST_HEADER("(GET|POST) ([^\\s]+) ([^\\s]+)$"),
ACCEPT_ENCODING("^Accept-Encoding: .*$");
private final Pattern pattern;
HttpPatterns(String regex) {
pattern = Pattern.compile(regex);
}
public boolean matches(String expression) {
return pattern.matcher(expression).matches();
}
public Object process(String expression) {
Matcher matcher = pattern.matcher(expression);
if (!matcher.matches()) {
throw new RuntimeException("Called `process`, but the expression doesn't match. Call `matches` first.");
}
if (this == RESPONSE_CODE) {
return Integer.parseInt(matcher.group(1));
} else if (this == CACHE_CONTROL) {
return CacheControl.parseString(matcher.group(1));
} else if (this == HOST) {
return matcher.group(1);
} else if (this == REQUEST_HEADER) {
return new RequestHeader(RequestType.parseString(matcher.group(1)), matcher.group(2), matcher.group(3));
} else { //never happens
return null;
}
}
}

---

MODIFIER

J'ai essayé de mise en œuvre selon les suggestions, mais ça ne marche pas et je suis de plus désespérée. Lorsque j'essaie d'afficher une image j'obtiens le message suivant à partir du navigateur:

L'image “http://www.google.com/images/logos/ps_logo2.png” ne peut être affichée car elle contient des erreurs.

Voici le log:

Request
==============================
GET http://www.google.com/images/logos/ps_logo2.png HTTP/1.1
Host: www.google.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Cookie: PREF=ID=31f95dd7f42dfc7d:TM=1303507626:LM=1303507626:S=D4kIZ6rGFrlOUWlm
Not Reading from the Cache!!!!
I am going to try to connect to: www.google.com at port 80
Connected.
Writing to the server's buffer...
flushed.
Getting a response...
Got a binary response!
contentLength = 26209; headers.length() = 312; responseLength = 12136; fullResponse length = 12136
Got a response!
Writing to the Cache!!!!
I am going to write the following response:
HTTP/1.1 200 OK
Content-Type: image/png
Last-Modified: Thu, 05 Aug 2010 22:54:44 GMT
Date: Wed, 04 May 2011 15:05:30 GMT
Expires: Wed, 04 May 2011 15:05:30 GMT
Cache-Control: private, max-age=31536000
X-Content-Type-Options: nosniff
Server: sffe
Content-Length: 26209
X-XSS-Protection: 1; mode=block
Response body is binary and was truncated.
Finished with request!

Voici le nouveau Response classe:

public class Response {
private String headers = "";
private BufferedReader reader;
private boolean busy = true;
private int responseCode;
private CacheControl cacheControl;
private InputStream fullResponse;
private ContentEncoding encoding = ContentEncoding.TEXT;
private ContentType contentType = ContentType.TEXT;
private int contentLength;
public Response(String input) {
this(new ByteArrayInputStream(input.getBytes()));
}
public Response(InputStream input) {
ByteArrayOutputStream tempStream = new ByteArrayOutputStream();
InputStreamReader inputReader = new InputStreamReader(input);
try {
while (!inputReader.ready());
int responseLength = 0;
while (inputReader.ready()) {
tempStream.write(inputReader.read());
responseLength++;
}
/*
* Read the headers
*/
reader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(tempStream.toByteArray())));
while (!reader.ready());//wait for initialization.
String line;
while ((line = reader.readLine()) != null) {
headers += "\r\n" + line;
if (HttpPatterns.RESPONSE_CODE.matches(line)) {
responseCode = (Integer) HttpPatterns.RESPONSE_CODE.process(line);
} else if (HttpPatterns.CACHE_CONTROL.matches(line)) {
cacheControl = (CacheControl) HttpPatterns.CACHE_CONTROL.process(line);
} else if (HttpPatterns.CONTENT_ENCODING.matches(line)) {
encoding = (ContentEncoding) HttpPatterns.CONTENT_ENCODING.process(line);
} else if (HttpPatterns.CONTENT_TYPE.matches(line)) {
contentType = (ContentType) HttpPatterns.CONTENT_TYPE.process(line);
} else if (HttpPatterns.CONTENT_LENGTH.matches(line)) {
contentLength = (Integer) HttpPatterns.CONTENT_LENGTH.process(line);
} else if (line.isEmpty()) {
break;
}
}
InputStreamReader streamReader = new InputStreamReader(new ByteArrayInputStream(tempStream.toByteArray()));
while (!reader.ready());//wait for initialization.
//Now let's get the rest
ByteArrayOutputStream out = new ByteArrayOutputStream();
int counter = 0;
while (streamReader.ready() && counter < (responseLength - contentLength)) {
out.write((char) streamReader.read());
counter++;
}
if (encoding == ContentEncoding.BINARY || contentType == ContentType.BINARY) {
System.out.println("Got a binary response!");
while (streamReader.ready()) {
out.write(streamReader.read());
}
} else {
System.out.println("Got a text response!");
while (streamReader.ready()) {
out.write((char) streamReader.read());
}
}
fullResponse = new ByteArrayInputStream(out.toByteArray());
System.out.println("\n\ncontentLength = " + contentLength + 
"; headers.length() = " + headers.length() + 
"; responseLength = " + responseLength + 
"; fullResponse length = " + out.toByteArray().length + "\n\n");
} catch (IOException e) {
//TODO Auto-generated catch block
e.printStackTrace();
} 
busy = false;
}

}

et voici le ProxyServer classe:

class ProxyServer {
public void start() {
while (true) {
Socket serverSocket;
Socket clientSocket;
OutputStreamWriter toClient;
BufferedWriter toServer;
try {
//The client is meant to put data on the port, read the socket.
clientSocket = listeningSocket.accept();
Request request = new Request(clientSocket.getInputStream());
//System.out.println("Accepted a request!\n" + request);
while(request.busy);
//Make a connection to a real proxy.
//Host & Port - should be read from the request
URL url = null;
try {
url = new URL(request.getRequestURL());
} catch (MalformedURLException e){
url = new URL("http:\\"+request.getRequestHost()+request.getRequestURL());
}
System.out.println(request);
//remove entry from cache if needed
if (!request.getCacheControl().equals(CacheControl.CACHE) && cache.containsRequest(request)) {
cache.remove(request);
}
Response response = null;
if (request.getRequestType() == RequestType.GET && request.getCacheControl().equals(CacheControl.CACHE) && cache.containsRequest(request)) {
System.out.println("Reading from the Cache!!!!");
response = cache.get(request);
} else {
System.out.println("Not Reading from the Cache!!!!");
//Get the response from the destination
int remotePort = (url.getPort() == -1) ? 80 : url.getPort();
System.out.println("I am going to try to connect to: " + url.getHost() + " at port " + remotePort);
serverSocket = new Socket(url.getHost(), remotePort);
System.out.println("Connected.");
serverSocket.setSoTimeout(50000);
//write to the server - keep it open.
System.out.println("Writing to the server's buffer...");
toServer = new BufferedWriter(new OutputStreamWriter(serverSocket.getOutputStream()));
toServer.write(request.getFullRequest());
toServer.flush();
System.out.println("flushed.");
System.out.println("Getting a response...");
response = new Response(serverSocket.getInputStream());
//System.out.println("Got a response!\n" + response);
System.out.println("Got a response!\n");
//wait for the response
while(response.isBusy());
}
if (request.getRequestType() == RequestType.GET && request.getCacheControl().equals(CacheControl.CACHE) && response.getResponseCode() == 200) {
System.out.println("Writing to the Cache!!!!");
cache.put(request, response);
}
else System.out.println("Not Writing to the Cache!!!!");
response = filter.filter(response);
//Return the response to the client
toClient = new OutputStreamWriter(clientSocket.getOutputStream());
System.out.println("I am going to write the following response:\n" + response);
BufferedReader responseReader = new BufferedReader(new InputStreamReader(response.getFullResponse()));
while (responseReader.ready()) {
toClient.write(responseReader.read());
}
toClient.flush();
toClient.close();
clientSocket.close();
System.out.println("Finished with request!");
} catch (IOException e) {
e.printStackTrace();
continue;
}
}
}
}

J'apprécie tous vos commentaires/connaissances/suggestion quant à la façon de résoudre ce problème, et aurait, bien sûr, préférez un peu de code.

OriginalL'auteur Amir Rachum | 2011-04-25