// Fetches the title, ranking and review count
// for a book with a given ISBN.
InputStream is = null;
OutputStream os = null;
HttpConnection conn = null;
int redirects = 0;
try {
String isbn = info.getIsbn();
String query = "index=books&field-keywords=" + isbn + "\r\n";
String requestMethod = HttpConnection.POST;
String name = QUERY_URL;
while (redirects < MAX_REDIRECTS) {
conn = (HttpConnection)Connector.open(name,
Connector.READ_WRITE);
// Send the ISBN number to perform the query
conn.setRequestMethod(requestMethod);
conn.setRequestProperty("Connection", "Close");
if (requestMethod.equals(HttpConnection.POST)) {
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
os = conn.openOutputStream();
os.write(query.getBytes());
os.close();
os = null;
}
// Read the response from the server
is = conn.openInputStream();
int code = conn.getResponseCode();
// If we get a redirect, try again at the new location
if ((code >= HttpConnection.HTTP_MOVED_PERM &&
code <= HttpConnection.HTTP_SEE_OTHER) ||
code == HttpConnection.HTTP_TEMP_REDIRECT) {
// Get the URL of the new location (always absolute)
name = conn.getHeaderField("Location");
is.close();
conn.close();
is = null;
conn = null;
if (++redirects > MAX_REDIRECTS) {
// Too many redirects - give up.
break;
}
// Choose the appropriate request method
requestMethod = HttpConnection.POST;
if (code == HttpConnection.HTTP_MOVED_TEMP ||
code == HttpConnection.HTTP_SEE_OTHER) {
requestMethod = HttpConnection.GET;
}
continue;
}
String type = conn.getType();
if (code == HttpConnection.HTTP_OK &&
type.equals("text/html")) {
info.setFromInputStream(is);
return true;
}
}
} catch (Throwable t) {
System.out.println(t);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ex) {
}
}
if (os != null) {
try {
os.close();
} catch (IOException ex) {
}
}
if (conn != null) {
try {
conn.close();
} catch (IOException ex) {
}
}
}
return false;
