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(The Servlet is configured in web.xml) (0.5 point):
a. Check validate input str: If users enter str string that is empty or spaces string, show the error text "Input string is invalid!" to servlet. (1.0 point)
b. Execute:
- If users choose "Length of string" option, count the number of characters of the string str, then output the result to servlet. (0.5 point)
(Example: str= "Hello world" output: 11).
- If users choose "Vowel characters" option, count the number of characters that are vowels in string str, then output the result to servlet. (Vowels are defined as any letter 'a', 'e', 'i', 'o', 'u'. The count should be case-insensitive and exclude any non-alphabetic characters) (0.5 point)
(Example: str= "Hello world" output: 3).
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