How do I pass multiple parameter in URL?
I am trying to figure out how to pass multiple parameters in a URL. I want to pass latitude and longitude from my android class to a java servlet. How can I do that?
URL url;
double lat=touchedPoint.getLatitudeE6() / 1E6;
double lon=touchedPoint.getLongitudeE6() / 1E6;
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+lon);
In this case output (written to file) is 28.53438677.472097
.
This is working but I want to pass latitude and longitude in two separate parameters so that my work at server side is reduced. If it is not possible how can I at least add a space between lat
& lon
so that I can use tokenizer
class to get my latitude and longitude. I tried following line but to no avail.
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+" "+lon);
output- Nothing is written to file
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+"&?param2="+lon);
output- 28.534386 (Only Latitude)
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+"?param2="+lon);
output- 28.532577?param2=77.502996
My servlet code is as follows:
req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");
final String par1 = req.getParameter("param1");
final String par2 = req.getParameter("param2");
FileWriter fstream = new FileWriter("C:\\Users\\Hitchhiker\\Desktop\\out2.txt");
BufferedWriter out = new BufferedWriter(fstream);
out.write(par1);
out.append(par2);
out.close();
Also I wanted to the know is this the most safe and secured way to pass the data from android device to server.
Solution 1:
This
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+"¶m2="+lon);
must work. For whatever strange reason1, you need ?
before the first parameter and &
before the following ones.
Using a compound parameter like
url = new URL("http://10.0.2.2:8080/HelloServlet/PDRS?param1="+lat+"_"+lon);
would work, too, but is surely not nice. You can't use a space there as it's prohibited in an URL, but you could encode it as %20
or +
(but this is even worse style).
1 Stating that ?
separates the path and the parameters and that &
separates parameters from each other does not explain anything about the reason. Some RFC says "use ? there and & there", but I can't see why they didn't choose the same character.
Solution 2:
I do not know much about Java but URL query arguments should be separated by "&", not "?"
https://www.rfc-editor.org/rfc/rfc3986 is good place for reference using "sub-delim" as keyword. http://en.wikipedia.org/wiki/Query_string is another good source.