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Description
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Object clone( ) String getComment( ) String getDomain( ) int getMaxAge( ) String getName( ) String getPath( ) boolean getSecure( )
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Returns a copy of this object Returns the comment Returns the domain Returns the age (in seconds) Returns the name Returns the path Returns true if the cookie is secure Otherwise, returns false Returns the value Returns the version Sets the comment to c
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String getValue( ) int getVersion( ) void setComment(String c)
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void setDomain(String d) Sets the domain to d void setMaxAge(int secs) Sets the maximum age of the cookie to secs This is the number of seconds after which the cookie is deleted void setPath(String p) void setSecure(boolean secure) void setValue(String v) void setVersion(int v) Sets the path to p Sets the security flag to secure
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The HttpServlet Class
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The HttpServlet class extends GenericServlet It is commonly used when developing servlets that receive and process HTTP requests The methods of the HttpServlet class are summarized in Table 27-9 Table 27-9 The Methods Defined by HttpServlet
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Method
Description
void doDelete(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException void doOptions(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException void doPut(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException void doTrace(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException long getLastModified(HttpServletRequest req) void service(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
Performs an HTTP DELETE
Performs an HTTP GET
Performs an HTTP OPTIONS
Performs an HTTP POST
Performs an HTTP PUT
Performs an HTTP TRACE
Returns the time (in milliseconds since midnight, January 1, 1970, UTC) when the requested resource was last modified Called by the server when an HTTP request arrives for this servlet The arguments provide access to the HTTP request and response, respectively
The HttpSessionBindingEvent Class
The HttpSessionBindingEvent class extends EventObject It is generated when a
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listener is bound to or unbound from a value in an HttpSession object HttpSessionBindingEvent has the following constructor: HttpSessionBindingEvent(HttpSession session, String name) Here, session is the source of the event, and name is the name associated with the object that is being bound or unbound The getName( ) method obtains the name that is being bound or unbound Its signature is shown here: String getName( ) The getSession( ) method obtains the session to which the listener is being bound or unbound Its signature is shown here: HttpSession getSession( )
The HttpUtils Class
The HttpUtils class provides three static methods, summarized next, that are useful for servlet developers: Method static StringBuffer getRequestURL(HttpServletRequest req) static Hashtable parsePostData(int size, ServletInputStream sis) Description Returns the URL that was issued by the client Returns a hash table that contains key/value pairs This method is useful for parsing HTTP forms that are submitted via the POST method The first argument is the number of bytes in the input stream The second argument is the input stream Parses the query string and returns a hash table containing the key/value pairs
static Hashtable parseQueryString(String s)
Handling HTTP Requests and Responses
The HttpServlet class provides specialized methods that handle the various types of HTTP requests A servlet developer typically overrides one of these methods These methods are doDelete( ), doGet( ), doOptions( ), doPost( ), doPut( ), and doTrace( ) A complete description of the different types of HTTP requests is beyond the scope of this book However, the GET and POST methods are commonly used when handling form input Therefore, this section presents examples of these cases You may learn more about HTTP by consulting RFC 2068 at the Internet Engineering Task Force site (http://wwwietforg)
Handling HTTP GET Requests
This section develops a servlet that handles an HTTP GET request The servlet is invoked when a form on a Web page is submitted The example contains two files: ColorGethtm defines a Web page, and ColorGetServletjava defines a servlet The HTML source code for ColorGethtm is shown in the following listing It defines a form that contains a select element and a
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submit button Notice that the action parameter of the form tag specifies a URL The URL identifies a servlet to process the HTTP GET request <html> <body> <center> <form name="Form1" action="http://localhost:8080/servlet/ColorGetServlet"> <B>Color:</B> <select name="color" size="1"> <option value="Red">Red</option> <option value="Green">Green</option> <option value="Blue">Blue</option> </select> <br><br> <input type=submit value="Submit"> </form> </body> </html> The source code for ColorGetServletjava is shown in the following listing The doGet( ) method is overridden to process any HTTP GET requests that are sent to this servlet It uses the getParameter( ) method of HttpServletRequest to obtain the selection that was made by the user A response is then formulated import javaio*; import javaxservlet*; import javaxservlethttp*; public class ColorGetServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String color = requestgetParameter("color"); responsesetContentType("text/html"); PrintWriter pw = responsegetWriter(); pwprintln("<B>The selected color is: "); pwprintln(color); pwclose();
Compile the servlet and then perform these steps to test this example: 1 Start the servletrunner 2 Display the Web page in a browser 3 Select a color 4 Submit the Web page After completing these steps, the browser displays the response that is dynamically generated by the servlet One other point: Parameters for an HTTP GET request are included as part of the URL that is sent to the Web server Assume that the user selects the red option and submits the form The URL sent from the browser to the server is the following:
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http://localhost:8080/servler/ColorGetServlet color=Red The characters to the right of the question mark are known as the query string
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