I want to generate a Get query string in java like so
www.example.com/somethingToGet?key1=value&key2=value....
So my method has 2 parameters the base url(www.example.com/somethingToGet) is the first argument and the 2nd argument is a map data structure. I want to iterate over the map and generate a string like so
key1=value&key2=value....
It shouldn't end with ampersand. I don't want to use any built in functions, I want to know the logic how such strings are generated.
Something like this:
public static String getQuery(String base, java.util.Map<String, String> map) {
StringBuilder str = new StringBuilder(base);
str.append('?');
boolean first = true;
for (java.util.Map.Entry<String, String> e : map.entrySet()) {
if (first)
first = false;
else
str.append('&');
str.append(e.getKey());
str.append('=');
str.append(e.getValue());
}
return str.toString();
}
You can also use the format method in URLEncoder class from the Apache HttpComponents library to create a query string. As per the documentation it
Returns a String that is suitable for use as an application/x-www-form-urlencoded list of parameters in an HTTP PUT or HTTP POST.
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