Servlet (Servlet and JavaServer Pages API Documentation)
Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.
Returns information about the servlet, such as author, version, and copyright.
Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
Called by the servlet container to allow the servlet to respond to a request.
public void init(ServletConfig config) throws ServletException
The servlet container calls the
method exactly once after instantiating the servlet.
init method must complete successfully
before the servlet can receive any requests.
The servlet container cannot place the servlet into service
public ServletConfig getServletConfig()
ServletConfigobject, which contains initialization and startup parameters for this servlet. The
ServletConfigobject returned is the one passed to the
Implementations of this interface are responsible for storing the
ServletConfig object so that this
method can return it. The
class, which implements this interface, already does this.
ServletConfigobject that initializes this servlet
public void service(ServletRequest req, ServletResponse res) throws ServletException, java.io.IOException
This method is only called after the servlet's
method has completed successfully.
The status code of the response always should be set for a servlet that throws or sends an error.
Servlets typically run inside multithreaded servlet containers that can handle multiple requests concurrently. Developers must be aware to synchronize access to any shared resources such as files, network connections, and as well as the servlet's class and instance variables. More information on multithreaded programming in Java is available in the Java tutorial on multi-threaded programming.
ServletRequestobject that contains the client's request
ServletResponseobject that contains the servlet's response
ServletException- if an exception occurs that interferes with the servlet's normal operation
java.io.IOException- if an input or output exception occurs
public java.lang.String getServletInfo()
The string that this method returns should be plain text and not markup of any kind (such as HTML, XML, etc.).
Stringcontaining servlet information
public void destroy()
servicemethod have exited or after a timeout period has passed. After the servlet container calls this method, it will not call the
servicemethod again on this servlet.
This method gives the servlet an opportunity to clean up any resources that are being held (for example, memory, file handles, threads) and make sure that any persistent state is synchronized with the servlet's current state in memory.
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