Servlet code for validating user Live webcams of south african girls xxx

Let’s talk today about how to control user authentication manually? Http Servlet Response; public class Servlet extends Http Servlet { public void do Post(Http Servlet Request req, Http Servlet Response res) throws Servlet Exception, IOException { int value1; int value2; int total = 0; String name = (String) Parameter("name"); String warning = ""; try { value1 = Integer.parse Int((String) Parameter("value1")); value2 = Integer.parse Int((String) Parameter("value2")); } catch (Number Format Exception e) { value1 = 0; value2 = 0; warning = "We got some bad value(blank or non numerics values, we set 0 instead"; } Attribute("name", name); Attribute("warning", warning); total = value1 + value2; Attribute("total", total); Request Dispatcher request Dispatcher = Request Dispatcher("/WEB-INF/show.jsp"); request Dispatcher.forward(req, res); } } To access the application, start the Tomcat and access through the address “filter-name” defines the Filter name that will be invoked. If the user entered a valid data, he will be redirected to a login success page otherwise he will be redirected to an error page. Now we just have to edit the “web.xml” and add our filter attribute there: When we access the link the user will be redirected to the login page. To do this authentication we will be using a simple but powerful Java class: “Filter”. Filter is a Java class able to intercept requests done by a client; you just have to map a request pattern (as URL, Servlet, etc). Start the Tomcat and access the application through the link: (If you still have some trouble accessing the first page of our tutorial, visit this link to clear your doubts: Creating a Web Server). We need to edit the “web.xml” file and add the Servlet mapping that we just created: package com; import After the user type a valid name/password, it will have the session validated.

servlet code for validating user-20

The files that will be described bellow are: one Servlet, two JSPs and a “web.xml” file (we will be able to do a Hello World Filter with these files). Our class will be like this: package com; public class User { private String name = "UNKNOW"; private String password = "UNKNOW"; public User(String name, String password){ = name; this.password = password; } public String get Name() { return name; } public void set Name(String name) { = name; } public String get Password() { return password; } public void set Password(String password) { this.password = password; } }package com; import

If you have any problem running the Web Application with the codes bellow, take a look at this article (Creating a Web Server) that will help you (with these codes bellow you will be able to run your Web Server and navigate on it).

In this sample code we are just printing “Hello World”, we need to be sure that our Filter class is being invoked. About the tags: “url-pattern” it tells witch url address we are mapping, and in our sample we are catching any requested url. If our user is not validated the method “validate Login” will return a null value. We created the LOGIN_ACTION_URI just to be sure that if the user is trying to validate its login, he does not get stuck in the login jsp.

Servlet Response; /** * Servlet Filter implementation class User Check Filter */ public class User Check Filter implements Filter { /** * @see Filter#init(Filter Config) */ public void init(Filter Config f Config) throws Servlet Exception { } /** * @see Filter#destroy() */ public void destroy() { } /** * @see Filter#do Filter(Servlet Request, Servlet Response, Filter Chain) */ public void do Filter(Servlet Request request, Servlet Response response, Filter Chain chain) throws IOException, Servlet Exception { println("Hello World"); Filter(request, response); } } The init and destroy methods belongs to the Filter interface and they must be implemented. Password().equals(password.trim())){ return null; } return user; } } The map “users” and the method “get Users” exists only to create valid users. This value is returned from the filter configurations, it will be configured in the very soon.

Http Session; public class User Validator extends Http Servlet { private static final Map(); User user One = new User("one","one"); User user Two = new User("two","TWO"); users.put(user Name(), user One); users.put(user Name(), user Two); return users; } public void do Get(Http Servlet Request req, Http Servlet Response res) throws Servlet Exception, IOException { do Post(req, res); } public void do Post(Http Servlet Request req, Http Servlet Response res) throws Servlet Exception, IOException { Request Dispatcher rd; String name = Parameter("name"); String password = Parameter("password"); User user = validate Login(name, password); if (user == null){ rd = Request Dispatcher("/login Error.jsp"); } else{ Http Session session = Session(); Attribute("user", user); rd = Request Dispatcher("/login Success.jsp"); } rd.forward(req, res); } /** * Validate the entered data * * If there is no valid data, the method will return null * * @param name given at the jsp * @param password given at the jsp * @return a user if one was found and validated */ private User validate Login(String name, String password) { // All parameters must be valid if (name == null || password == null){ return null; } // Get a user by key User user = users.get(name); if (user == null){ return null; } // Check if the password is valid if (! We have in the code above too an attribute named LOGIN_ACTION_URI.

Last modified 20-Jul-2015 21:11