init()
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public void init(ServletConfig config) throws ServletException
The init() method is called only once by the servlet container throughout the life of a servlet. By this init() method the servlet get to know that it has been placed into service.
The servlet cannot be put into the service if
The init() method does not return within a fix time set by the web server.
It throws a ServletException
Parameters - The init() method takes a ServletConfig object that contains the initialization parameters and servlet's configuration and throws a ServletException if an exception has occurred.
service()
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public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException
Once the servlet starts getting the requests, the service() method is called by the servlet container to respond. The servlet services the client's request with the help of two objects. These two objects javax.servlet.ServletRequest and javax.servlet.ServletResponse are passed by the servlet container.
The status code of the response always should be set for a servlet that throws or sends an error.
Parameters - The service() method takes the ServletRequest object that contains the client's request and the object ServletResponse contains the servlet's response. The service() method throws ServletException and IOExceptions exception.
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public void init(ServletConfig config) throws ServletException
The init() method is called only once by the servlet container throughout the life of a servlet. By this init() method the servlet get to know that it has been placed into service.
The servlet cannot be put into the service if
The init() method does not return within a fix time set by the web server.
It throws a ServletException
Parameters - The init() method takes a ServletConfig object that contains the initialization parameters and servlet's configuration and throws a ServletException if an exception has occurred.
service()
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public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException
Once the servlet starts getting the requests, the service() method is called by the servlet container to respond. The servlet services the client's request with the help of two objects. These two objects javax.servlet.ServletRequest and javax.servlet.ServletResponse are passed by the servlet container.
The status code of the response always should be set for a servlet that throws or sends an error.
Parameters - The service() method takes the ServletRequest object that contains the client's request and the object ServletResponse contains the servlet's response. The service() method throws ServletException and IOExceptions exception.