To prevent common web vulnerabilities like SQL Injection, XSS, input validation is really crucial.
In Java, we can validate inputs on both the client-side for better user experience and server-side for better security.
Here's an example where we're using regular expressions in Java to validate input on the server-side:
public boolean isValidInput(String input) {
// Only allow alphanumeric characters
return input.matches("^[a-zA-Z0-9]+$");
}
Here, we can also use libraries like OWASP ESAPI for more advanced input validations:
import org.owasp.esapi.ESAPI;
public boolean isValidInput(String input) {
return ESAPI.validator().isValidInput("Input", input, "SafeString", 100, false);
}