Login Servlet With Database In Eclipse
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Java web project login and registration with JSP and servlet with Mysql By codebun java web project 5 Comments In this tutorial, we are going to cover complete Login and Registration activity with JSP and servlet and MySQL.
Servlet JDBC Database connection and Log4j integration is the topic of this tutorial. We have provided a lot of tutorials on servlets in java, this tutorial is aimed to use all of those information to create a full-fledged web application with database connectivity and log4j integration for logging.I strongly recommend to check out following tutorials if you are not familiar with any of these. All of them contains sample project that you can download and run for understanding the core concepts of Servlet API.
Table of Contents.Servlet JDBC ExampleDevelop a web application that should have following features. User can register and then login to the application.
The users information should be maintained in database. Use standard logging framework log4j. The application should support session management, no JSPs should be visible without session. Users can logout anytime from the application. We should not show application and server details to user incase of any exception in application or other common errors like 404.Once we have our basic application ready, we can move on to add other features.
Design Decisions. Since login page is the entry point of application, we will have a simple login.html where user can enter their credentials; email and password.
We can’t rely on javascript validations, so we will do server side validation and incase of missing information we will redirect user to login page with error details. We will have a register.html from where user can register to our application, we will provide it’s link in the login page for new user. User should provide email, password, name and country details for registration.If any information is missing, user will remain on same page with error message. If registration is successful, user will be forwarded to the login page with registration success information and they can use email and password to login. We will use MySql database for persisting user information. We will create a new database, user and Users table for our application.
Since our application totally depends on Database Connection, we will create a servlet context listener to initialize the database connection and set it as context attribute for other servlets.We will keep DB configuration details configurable through deployment descriptor. We will also add MySql Java Connector jar to the application libraries. Since we want to use log4j and configure it properly before usage, we will utilize servlet context listener to configure log4j and keep the log4j configuration XML file location in web.xml init parameters. We will write our application logs in a separate log file dbexample.log for easier debugging. Incase of any exceptions like “Database Connection Error” or 404 errors, we want to present a useful page to user. We will utilize servlet exception handling and write our own Exception Handler servlet and configure it in deployment descriptor. Once the user logins successfully, we will create a session for the user and forward them to home.jsp where we will show basic information of the user.
We will have a model class User that will store the user data into session. User home page also provide logout button that will invalidate the session and forward them to login page. We need to make sure all the JSPs and other resources are accessible only when user has a valid session, rather than keeping session validation login in all the resources, we will create a Servlet Filter for session validation and configure it in deployment descriptor. We will use Servlet 3.0 features for servlet configuration, listeners and filters rather than keeping all of these in deployment descriptor.
We will use Eclipse for development and Tomcat 7 for deployment.Based on above requirements and design decisions, we will create our dynamic web project whose project structure will look like below image. Copy
As of now please bear with this. Run the Servlet JDBC Example ApplicationOur application is ready for execution, I would suggest to export it as WAR file and then deploy to tomcat rather than deploying it directly to Tomcat server from Eclipse so that you can easily look into the log4j log file for debugging.Some sample execution pages are shown in below images.User Registration Page:Registration Success Page:Login Page:User Home Page:404 Error Page:Input Validation Error Page:log4j Log File:dbexample.log. Every web app has it’s own servlet context from which Container knows which application to redirect the request.For example localhost:8080/app, here “app” is the servlet context of the application. As you said that it’s working in Netbeans and not in Eclipse, it seems to be some issue in your environment.
Are you using the same Tomcat server in both Eclipse and Netbeans?What is the error you are getting when you launch the application from the Eclipse IDE. Also check the images and try to hit that URL. Hi pankaj, i just pasted your code as it is and according to directory structure. But it is not working.error is:HTTP Status 404 – /ServletDBLog4jExample/——————————————————————————–type Status reportmessage /ServletDBLog4jExample/description The requested resource (/ServletDBLog4jExample/) is not available.——————————————————————————–Apache Tomcat/7.0.23Yes am using the same Tomcat server in both Eclipse and Netbeans, but not same time ie netbeans tomcat is in stop mode pls help me out?.says. The issue is clearly in deployment, try to export project from Eclipse and WAR file and then deploy it in standalone Tomcat, not through Eclipse and see if it runs fine. Deploying in standalone tomcat helps in debugging because you can easily check the server logs for any deployment issues.One quick query, you are launching project through Eclipse “Run on Server” and it should be trying to open the project home page. Try to access the URL for “Register Page” as shown in the first image of the post.yigwoo says.
Login Servlet With Database In Eclipse Program
In AuthenticationFilter.java - doFilter methodthe codeif(session null &&!(uri.endsWith(“html”) uri.endsWith(“Login”) uri.endsWith(“Register”)))shouldn’t session null &&!(uri.endsWith(“html”) be put in one parenthesis together? Because if you don’t do this, when client send a request like “yourapp/Login” or “yourapp/Register” and the session is null, the second statement will be evaluated as false thus causes the if sentence to be false. Eventually, the page don’t land on “login.html” but rather an error page thrown by the web container.Best regards.