public class AddCgi { private static long[] parseParams( String query ) throws NumberFormatException, IllegalArgumentException { long[] result = new long[2]; String [] params = query.split("&"); for( int i = 0 ; i < params.length; i++ ) { String [] words = params[i].split("="); if ( words.length != 2 ) continue; if ( words[0].equals("a") ) { result[0] = Long.parseLong( words[1] ); } else if ( words[0].equals("b") ) { result[1] = Long.parseLong( words[1] ); } else { throw new IllegalArgumentException("unknown param"); } } return result; } public static void main( String[] args ) { long[] params; try { params = parseParams( System.getenv("QUERY_STRING") ); } catch( Exception ex ) { System.out.print("Content-Type: text/plain\r\n\r\n"); System.out.println(ex.getMessage() ); return; } long a = params[0]; long b = params[1]; System.out.print("Content-Type: text/html\r\n\r\n"); System.out.println("" ); System.out.println("" ); System.out.println("

" ); System.out.println("Sum of " + a + " + " + b + " = " + (a+b) ); System.out.println("

" ); System.out.println("" ); System.out.println("" ); } }