Generate a Get query string in Java

Question

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.

acesargl · Accepted Answer · 2015-06-11 12:11:07Z

1

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();
}

answered Jun 11, 2015 at 12:11

acesargl

5693 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Dhanush Gopinath · Accepted Answer · 2015-06-11 13:34:27Z

0

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.

answered Jun 11, 2015 at 13:34

Dhanush Gopinath

5,7697 gold badges41 silver badges68 bronze badges

Collectives™ on Stack Overflow

Generate a Get query string in Java

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related