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how to check protocol is present in URL , if not present need to append it.
is there any class to achieve this in java?
eg: String URL = http://www.google.com
need to get http://www.google.com
Let’s say you have
String url = www.google.com. String class methods would be enough for the goal of checking protocol identifiers. For example,url.startsWith("https://")would check whether a specific string is starting with the given protocol name.However, are these controls enough for validation?
I think they aren’t enough. First of all, you should define a list of valid protocol identifiers, e.g. a String array like
{"http", "ftp", "https", ...}. Then you can parse your input String with regex("://")and test your URL header whether it belongs to the list of valid protocol identifiers. And domain name validation methods are beyond this question, you can/should handle it with different techniques as well.