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Java Class
The next step is to write the Java class that will be used by the application. In this very simple example, I created a single Java class that will be initialized and retained by the AppDelegate. The code for URLRetriever.java is as follows:
import java.net.URL;
import java.net.MalformedURLException;
import java.net.URLConnection;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class URLRetriever {
private URL url;
public URLRetriever() {
}
public boolean setURL(String s) {
try {
url = new URL(s);
return true;
} catch (MalformedURLException e) {
return false;
}
}
public String retrieveSource() {
try {
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuffer sb = new StringBuffer();
for (String s = reader.readLine(); s != null; s = reader.readLine()) {
sb.append(s);
sb.append('\n');
}
reader.close();
return sb.toString();
} catch (Exception e) {
return "Error retrieving data";
}
}
}
In this example, a URL is passed in and verified against being malformed. When the retrieveSource method is called, a connection is made to the URL, its contents are retrieved into a StringBuffer, and the results are returned.