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Newsgroups: comp.lang.java.programmer
Date: Sat, 30 Mar 2013 14:22:18 -0700 (PDT)
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Subject: JAVA Networking: Code with getInputStream() was compatible with Java 1.6, is but anymore with 1.7
From: musart <marcos.barandun@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:23164

Hello Everybody...

I have a piece of software which establishes a communication between a PC a=
nd a machine, which used to work in Java 1.6, but doesn't anymore in 1.7. T=
he IOException --> "Invalid Http response" is what I get as soon as the get=
InputStream() method is called. It seems like the method had been improved =
an is much more sensitive, meaning that responseCode=3D-1 result is not spe=
cifically checked in Java 1.6.

Assited with Wireshark I checked if both versions (1.6 & 1.7) sent and rece=
ived same Ethernet frames, and so did both.

I can only resolve this from the PC (client) side...that means no posibilit=
y to edit or change the Server code.

I would apreciate any help on how to modify or implement something new to m=
ake the code compatible for ver. 1.7 as Im not a former programmer... Thank=
s

1. get is called
2. return readResponse(..) is called
3. getInputStream() --> IOException
4. catch (Exception e) {System.out.println("error sending get request " + g=
etURL() + " string: " + requestString); return Error.ethernetException; //T=
ODO


Code:

private String get(String requestString)/* throws ComunicationException*/ {
HttpURLConnection httpURLConnection =3D null;
OutputStream out =3D null;

try {
String encodedRequestString =3D URLEncoder.encode(requestString, "iso-8859-=
1");
String path =3D getURL().getPath();
if (!path.endsWith("/")) path =3D path + "/";
path =3D path + encodedRequestString;
URL fullURL =3D new URL(getURL().getProtocol(), getURL().getHost(), getURL(=
).getPort(), path);
httpURLConnection =3D (HttpURLConnection)fullURL.openConnection();
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setDoOutput(false);
httpURLConnection.setDoInput(true);
httpURLConnection.setUseCaches(false);

// Set timeout at 5s
httpURLConnection.setConnectTimeout(m_nTimeOut);
httpURLConnection.setReadTimeout(m_nTimeOut);

return readResponse(httpURLConnection);

} catch (Exception e) {
System.out.println("error sending get request " + getURL() + " string: " + =
requestString);
return Error.ethernetException; //TODO
} finally {
if (out !=3D null) {
try {
out.close();
} catch (Throwable t) {
System.out.println("GET: out.close(), Class: Client");
}
}

if (httpURLConnection !=3D null) {
try {
httpURLConnection.disconnect();
} catch (Throwable t) {
System.out.println("GET: httpURLConnection.disconnect(), Class: Client");
}
}
}
}

/**
* Reads the response from the server into a string.
* The content length header must be set!
* @param connection
* @return
* @throws IOException
*/
private String readResponse(HttpURLConnection connection) throws IOExceptio=
n {
if (connection =3D=3D null) throw new IllegalStateException("connection mus=
t not be null");

connection.connect();

int status =3D connection.getResponseCode();
System.out.println(status);

// InputStream aaa =3D connection.getInputStream();

Reader reader =3D null;
try {
reader =3D new InputStreamReader(connection.getInputStream(), "iso-8859-1")=
;

int readBufferSize =3D connection.getContentLength();
if (readBufferSize < 0) {
// use default buffer size
readBufferSize =3D DEFAULT_READ_BUFFER_SIZE;
}

// if content length was set, read will be done in a single
// iteration because buffer fits...
StringBuffer response =3D new StringBuffer();
char[] readBuffer =3D new char[readBufferSize];
int len;
while ((len =3D reader.read(readBuffer)) > 0) {
response.append(new String(readBuffer, 0, len));
}
return response.toString();

} catch (IOException ioe) {
throw ioe;
} finally {
if (reader !=3D null) {
try {
reader.close();
} catch (Throwable t) {
System.out.println("readResponse: reader.close(), Class: Client");
//log
}
}
}
}

/**
*
* @return the url
*/
public URL getURL() {
return url;
}
}