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The source code for PostParametersServletjava is shown in the following listing The service( ) method is overridden to process client requests The getParameterNames( ) method returns an enumeration of the parameter names These are processed in a loop You can see that the parameter name and value are output to the client The parameter value is obtained via the getParameter( ) method
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import javaio*; import javautil*; import javaxservlet*; public class PostParametersServlet extends GenericServlet { public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { // Get print writer PrintWriter pw = responsegetWriter(); // Get enumeration of parameter names Enumeration e = requestgetParameterNames(); // Display parameter names and values while(ehasMoreElements()) { String pname = (String)enextElement(); pwprint(pname + " = "); String pvalue = requestgetParameter(pname); pwprintln(pvalue); } pwclose(); } }
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Compile the servlet Next, copy it to the appropriate directory, and update the webxml file, as previously described Then, perform these steps to test this example: 1 Start Tomcat (if it is not already running) 2 Display the web page in a browser 3 Enter an employee name and phone number in the text fields 4 Submit the web page After following these steps, the browser will display a response that is dynamically generated by the servlet
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31:
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Servlets
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The javaxservlethttp package contains a number of interfaces and classes that are commonly used by servlet developers You will see that its functionality makes it easy to build servlets that work with HTTP requests and responses The following table summarizes the core interfaces that are provided in this package:
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Interface HttpServletRequest HttpServletResponse HttpSession HttpSessionBindingListener Description Enables servlets to read data from an HTTP request Enables servlets to write data to an HTTP response Allows session data to be read and written Informs an object that it is bound to or unbound from a session
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The following table summarizes the core classes that are provided in this package The most important of these is HttpServlet Servlet developers typically extend this class in order to process HTTP requests
Class Cookie HttpServlet HttpSessionEvent HttpSessionBindingEvent Description Allows state information to be stored on a client machine Provides methods to handle HTTP requests and responses Encapsulates a session-changed event Indicates when a listener is bound to or unbound from a session value, or that a session attribute changed
The HttpServletRequest Interface
The HttpServletRequest interface enables a servlet to obtain information about a client request Several of its methods are shown in Table 31-5
The HttpServletResponse Interface
The HttpServletResponse interface enables a servlet to formulate an HTTP response to a client Several constants are defined These correspond to the different status codes that can be assigned to an HTTP response For example, SC_OK indicates that the HTTP request succeeded, and SC_NOT_FOUND indicates that the requested resource is not available Several methods of this interface are summarized in Table 31-6
The HttpSession Interface
The HttpSession interface enables a servlet to read and write the state information that is associated with an HTTP session Several of its methods are summarized in Table 31-7 All of these methods throw an IllegalStateException if the session has already been invalidated
Part III:
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Method String getAuthType( ) Cookie[ ] getCookies( ) long getDateHeader(String field) String getHeader(String field) Enumeration getHeaderNames( ) int getIntHeader(String field) String getMethod( ) String getPathInfo( ) String getPathTranslated( )
Description Returns authentication scheme Returns an array of the cookies in this request Returns the value of the date header field named field Returns the value of the header field named field Returns an enumeration of the header names Returns the int equivalent of the header field named field Returns the HTTP method for this request Returns any path information that is located after the servlet path and before a query string of the URL Returns any path information that is located after the servlet path and before a query string of the URL after translating it to a real path Returns any query string in the URL Returns the name of the user who issued this request Returns the ID of the session Returns the URI Returns the URL Returns that part of the URL that identifies the servlet Returns the session for this request If a session does not exist, one is created and then returned If new is true and no session exists, creates and returns a session for this request Otherwise, returns the existing session for this request
String getQueryString( ) String getRemoteUser( ) String getRequestedSessionId( ) String getRequestURI( ) StringBuffer getRequestURL( ) String getServletPath( ) HttpSession getSession( ) HttpSession getSession(boolean new)
boolean Returns true if a cookie contains the session ID Otherwise, returns isRequestedSessionIdFromCookie( ) false boolean isRequestedSessionIdFromURL( ) boolean isRequestedSessionIdValid( ) Returns true if the URL contains the session ID Otherwise, returns false Returns true if the requested session ID is valid in the current session context
TABLE 31-5
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