How would you ensure a filter only processes requests for a specific servlet?
- Check the servlet name in the configuration
- Set a specific attribute in the request
- Use if conditions in the doFilter() method
- Use the url-pattern in the filter mapping
To ensure a filter processes requests for a specific servlet, configure the filter mapping in the deployment descriptor (web.xml) using the url-pattern element with the appropriate servlet mapping.
If a filter needs to perform different actions based on whether the request is an HTTP GET or POST, where should this logic be implemented?
- In the destroy() method
- In the doFilter() method
- In the init() method
- In the service() method
The logic for different actions based on HTTP GET or POST requests should be implemented in the doFilter() method of the filter. This method is responsible for processing the request and can be customized for different scenarios.
The __________ method is called by the web container to indicate to a filter that it is being taken out of service.
- close()
- destroy()
- release()
- terminate()
The destroy() method is called by the web container to indicate to a filter that it is being taken out of service.
Filters are configured in the __________ file of a web application.
- filter-config.xml
- filter.xml
- web-config.xml
- web.xml
Filters are configured in the web.xml file of a web application.
The method __________ is used to handle request and response objects in a filter.
- doFilter()
- filterRequest()
- initFilter()
- processFilter()
The method doFilter() is used to handle request and response objects in a filter.
The filter's __________ method is invoked for every request/response pair processed by the filter.
- doFilter()
- doProcessing()
- execute()
- process()
The filter's doFilter() method is invoked for every request/response pair processed by the filter.
The __________ method of the FilterChain interface is used to invoke the next filter in the chain.
- doFilter()
- invokeNext()
- nextFilter()
- proceed()
The doFilter() method of the FilterChain interface is used to invoke the next filter in the chain.
When implementing a filter, it's critical to maintain the correct order of processing by calling __________ in the doFilter method.
- doProcessing.filter()
- filterChain.doFilter()
- filterOrder.doFilter()
- servletRequest.process()
In the doFilter method of a filter, it's important to call filterChain.doFilter() to ensure the correct order of processing continues.
In the filter chain, the __________ method is used to perform the actual filtering.
- doFilter()
- filterRequest()
- initFilter()
- processFilter()
In the filter chain, the doFilter() method is used to perform the actual filtering of requests and responses.
How does filter ordering affect the processing of requests and responses in a servlet application?
- Filter ordering has no impact on processing
- Filters are always processed in a random order
- Filters are processed in the order they are declared
- Filters are processed in the reverse order they are declared
Filter ordering affects the processing of requests and responses in a servlet application. They are processed in the reverse order they are declared in the deployment descriptor, affecting the sequence of their execution.
What happens if a filter in the filter chain does not call the doFilter() method?
- An exception is thrown
- The filter chain continues processing without the filter
- The request processing stops
- The response is sent to the client directly
If a filter does not call the doFilter() method, the request processing stops, and the subsequent filters in the chain and the servlet are not invoked.
How can a filter chain be used to implement security checks in a web application?
- Bypass the filter chain for security checks
- Implement security logic in each filter
- Include multiple filter instances in the chain
- Use only a single filter for all security checks
A filter chain can be used to implement security checks by including multiple filter instances, each responsible for a specific security aspect, and processing them in the order they are configured.