Set - 1

Question 6 :

Given the request path below, which are context path, servlet path and path info?

Answer :

/bookstore/education/index.html

context path: /bookstore
servlet path: /education
path info: /index.html


Question 7 :

What is filter? Can filter be used as request or response?

Answer :

A filter is a reusable piece of code that can transform the content of HTTP requests,responses, and header information. Filters do not generally create a response or respond to a request as servlets do, rather they modify or adapt the requests for a resource, and modify or adapt responses from a resource.


Question 8 :

When using servlets to build the HTML, you build a DOCTYPE line, why do you do that?

Answer :

I know all major browsers ignore it even though the HTML 3.2 and 4.0 specifications require it. But building a DOCTYPE line tells HTML validators which version of HTML you are using so they know which specification to check your document against. These validators are valuable debugging services, helping you catch HTML syntax errors.


Question 9 :

What is new in ServletRequest interface ? (Servlet 2.4)

Answer :

The following methods have been added to ServletRequest 2.4 version:
public int getRemotePort()
public java.lang.String getLocalName()
public java.lang.String getLocalAddr()
public int getLocalPort()


Question 10 :

Request parameter How to find whether a parameter exists in the request object?

Answer :

1.boolean hasFoo = !(request.getParameter("foo") == null || request.getParameter("foo").equals(""));
2. boolean hasParameter = request.getParameterMap().contains(theParameter);
(which works in Servlet 2.3+)