Code for CookieTest in Java

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Code for CookieTest
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import import import import javaio*; javaxservlet*; javaxservlethttp*; javautil*;
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// 10, Listing 4 public class CookieTest extends javaxservlethttpHttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException { OutputStream out = resgetOutputStream(); PrintWriter pw = new PrintWriter ( new BufferedWriter ( new OutputStreamWriter ( out ) ) ); Cookie[] cookies = reqgetCookies(); Cookie current = null; // Check to see if no cookies exist if(cookies != null) { // For each and every cookie, display name and // value for(int i=0;i<cookieslength;i++) { pwprintln("name="+cookies[i]getName()); pwprintln("value="+cookies[i]getValue()); pwprintln("version="+cookies[i]getVersion()); if(cookies[i]getName()equals("cookie")) { current=cookies[i]; } pwprintln(); } } int count=0; if(current != null) { count = IntegerparseInt(currentgetValue()); // Add new cookie, so we have more than one cookie // stored in browser resaddCookie(new Cookie("previouscookie",new Integer(count)toString())); } // Increment count pwprintln("Count of value stored in cookie = count++; "+count);
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// Add cookie to save state data for next invocation resaddCookie(new Cookie("cookie",new Integer(count)toString())); pwflush(); pwclose(); } }
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How CookieTest Works
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The code for the cookie servlet is fairly straightforward At the beginning, we retrieve an array containing every cookie accessible by the servlet None, one, or many cookies may be accessible, so we must first check to see if the array is empty before attempting to access any of its elements
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Cookie[] cookies = reqgetCookies(); Cookie current = null; // Check to see if no cookies exist if(cookies != null) { // }
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Next, for demonstration purposes we echo to the browser any cookies that have been detected by the servlet In this example, we'll be using two cookies (one for the current value of the counter and one for the previous value), but your applications may use more, subject to the size limits imposed by browsers
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// For each and every cookie, display name and // value for(int i=0;i<cookieslength;i++) { pwprintln("name="+cookies[i]getName()); pwprintln("value="+cookies[i]getValue()); pwprintln("version="+cookies[i] getVersion()); if(cookies[i]getName()equals("cookie")) { current=cookies[i]; } pwprintln(); }
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Running CookieTest
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After compiling and installing CookieTest in your preferred servlet engine, or servletrunner for testing purposes, you'll notice that a cookie will be added to your browser If you have security settings on your browser to reject cookies, or to manually accept/deny cookies, this will be easier to observe Cookie data will be retained on subsequent executions Please note that to see the cookie change, you'll need to "refresh" your browser so that a new HTTP request is sent to the servlet
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1013 HTTP Session Management in Servlets
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As mentioned in Section 1012, the HTTP protocol uses a stateless model Since useful HTTPbased applications will most likely require a stateful model, this presents an interesting challenge During development of servlets, Sun wisely decided to provide a helper system to allow the base HTTP servlet and the servlet engine behind it to handle the issues of keeping track of state over multiple HTTP requests The HTTPSession class provides this session management This class, by default, determines whether cookies or URL rewriting should be used In the case of URL rewriting, a unique session identifier can be sent as a parameter between the server and client in each request-response for the servlet HTTPSession also provides other helper methods to keep track of data that should be held across sessions Sessions have automatic timeouts and can be created or cancelled at will by the servlet To obtain an HTTPSession, the getSession method of the HTTPServletRequest class is called The getSession(boolean createNewSession) method is used to obtain the current servlet session, and if the createNewSession flag is set to "true," one is created if none already exists This method returns a reference to a session, which can then be used to obtain information about it, and get, set, or remove values associated with it The ability to obtain the session ID from this class also exists These values are stored on the server side in the servlet engine with a unique identifier being sent across only to the client Therefore, you should feel safe in storing confidential or secure information in the session without worrying about it being detected by packet sniffing between server and client However, the potential for abuse still exists, if the session identifier and IP address of the client are forged Thus, no system is absolutely secured
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