01 overview-servlets-and-environment-setup
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This document provides an overview and setup instructions for introducing servlets. It discusses: 1) What a servlet is - a Java program that runs on a server and processes incoming web requests and responses based on a URL. 2) Installing Tomcat, the Java web server, and Eclipse, the IDE, to develop and run servlets. 3) Creating a basic "Hello World" web application with a servlet using Eclipse, and deploying it to Tomcat.
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Extract the content of the employees-app.zip file in your local system.
Log in to Oracle Cloud at http://cloud.oracle.com/. Enter your account credentials in the Identity Domain, User Name, and Password fields.
In the Oracle Cloud Services dashboard, click the Action menu Menu, and select Application Container.
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In the Application section, enter a name for your application and click Browse.
On the File Upload dialog box, select the employee-app.war file located in the target directory and click Open.
Keep the default values in the Instances and Memory fields and click Create.
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More from dhrubo kayal (20)
01 session tracking
01 session trackingdhrubo kayal Session tracking allows servers to maintain state for individual users across multiple requests or page visits. The HttpSession interface provides a way to do this in Java web applications. It acts as a hashtable associated with each user, allowing information to be stored and retrieved by key. Developers can store data in a session using setAttribute, retrieve it with getAttribute, and remove it with removeAttribute or by invalidating the entire session. Some servers support distributed and persistent sessions to allow session data to be accessed across multiple servers for load balancing or survive server restarts.
03 handling requests
03 handling requestsdhrubo kayal The document discusses handling requests in servlets by creating and submitting HTML forms. It explains that form data is sent as client requests when a form is submitted, and covers reading request parameters from forms. Key points covered include using input fields like text, radio buttons, and checkboxes in forms, and reading submitted data using request.getParameter and related methods.
02 up close with servlets
02 up close with servletsdhrubo kayal The document discusses servlets including servlet responses, the request-response sequence, servlet URLs, and the servlet lifecycle. It provides code examples of a simple servlet that returns text and HTML responses. It also covers registering servlets in web.xml, initializing servlets, and setting initialization parameters.
19 reflection
19 reflectiondhrubo kayal Reflection in Java allows inspection of classes, interfaces, fields and methods at runtime without knowing their names at compile time. It is used to obtain metadata about classes including their name, modifiers, superclass, implemented interfaces, constructors and methods. This metadata can then be used to instantiate objects, invoke methods and get/set field values dynamically without hardcoding the class names. Reflection is important for building dynamic frameworks and allowing dynamic code addition at runtime.
18 concurrency
18 concurrencydhrubo kayal Java was one of the first mainstream programming languages to include threading support within the language itself. This paved the way for Java to become widely used for writing server applications. Every Java program has at least one thread - the main thread. Additional threads are created by the JVM for garbage collection and other tasks. Threads allow programs to take advantage of multi-processor systems and provide more responsive user interfaces by handling long-running processes in background threads.
17 exceptions
17 exceptionsdhrubo kayal The document discusses exceptions in Java. It explains that try blocks are used to guard code that may throw exceptions, and catch blocks handle specific exception types. If an exception is thrown in a try block, the exception handling mechanism searches for the first matching catch block. Finally blocks allow executing cleanup code whether or not an exception occurs. Custom exceptions can be created by extending the Exception class. Runtime exceptions represent programming errors and do not require declaration.
16 containers
16 containersdhrubo kayal This document discusses various Java collection classes including List, Map, Set, and Iterator. It provides examples of how to declare and use ArrayList, LinkedList, HashSet, and HashMap. It also covers generics, duplicates, and implementing a queue and stack with LinkedList.
15 interfaces
15 interfacesdhrubo kayal This document discusses interfaces in Java. It explains that interfaces allow for establishing common behaviors across classes without implementation. An interface defines method signatures but provides no bodies, leaving the implementation to classes that implement the interface. Classes can implement multiple interfaces. Interfaces can contain static final fields but no non-static methods or fields. The document provides examples of defining an interface and a class that implements it. It also discusses extending interfaces similarly to classes.
14 initialization & cleanup
14 initialization & cleanupdhrubo kayal Constructors are called when an object is created and have the same name as the class. They initialize objects and can be overloaded like methods to have different signatures. A default constructor is provided if none is defined. Destructors do not exist in Java, instead objects are garbage collected when no longer referenced by the system.
13 inheritance
13 inheritancedhrubo kayal The document discusses inheritance in object-oriented programming. It defines inheritance as creating a new class as a type of existing class by cloning the existing class and adding or modifying code without changing the original. The key points covered include the need for inheritance to reuse code from a base class in derived classes, rules around inheritance like extending classes and overriding methods, and concepts like upcasting, protected access, and method calling in inheritance relationships.
11 static
11 staticdhrubo kayal The document discusses static fields and methods in Java classes. Static members are associated with the class itself rather than objects of the class. Static fields provide a single storage location for a field that is shared across all instances of a class. Static methods can be called without creating an object and are used to perform operations on static fields or that do not require object state. The document provides examples of declaring static fields and methods and demonstrates how they can be accessed from both static and non-static contexts.
10 access control
10 access controldhrubo kayal The document discusses Java access specifiers (public, private, protected). It explains that access specifiers determine which classes can access fields and methods in other classes. Public members can be accessed by any class, private members only within the class, and the default/package access level allows access within the same package. Examples are provided to demonstrate how to control access between classes in different packages using these specifiers.
09 packages
09 packagesdhrubo kayal Packages are used to organize classes into groups under a single namespace. Classes from other packages can be accessed using their fully qualified names or by importing the package. The import statement allows using a class without specifying the package, while package statements declare which package a class belongs to. Packages help avoid naming collisions and provide a way to encapsulate related classes together in a library.
08 class and object
08 class and objectdhrubo kayal This document introduces the concepts of classes and objects in Java. It defines a class as a template that introduces a new type into the system and defines an object as an instance of a class. The key points covered include:
- Objects are created from classes using the new operator.
- Objects contain fields to store data and methods to manipulate the data.
- When passing primitive data types to methods, the value is passed but when passing objects, the reference is passed.
- Methods determine the messages an object can receive including name, arguments, return type and body.
07 flow control
07 flow controldhrubo kayal Flow control statements like if-else, while, for, switch etc. allow a program to conditionally execute blocks of code or repeat blocks of code. They break up the flow of execution. if-else is used for conditional execution based on a boolean expression. while and do-while loops repeat a statement or block until a boolean condition is false. for loops initialize a variable, check a condition, and update the variable on each iteration. break exits the current loop, continue skips to the next iteration, and return exits the current method.
05 operators
05 operatorsdhrubo kayal The document discusses various operators in Java including mathematical, assignment, increment/decrement, relational, logical, ternary, string and casting operators. It provides examples of using each operator and notes precedence rules and other behaviors like type promotion and truncation versus rounding during casting.
04 data types & variables
04 data types & variablesdhrubo kayal The document discusses data types in Java programming, including primitive data types like integers and longs, as well as variables which store values of a specific data type and how they are declared and named. It also covers literals, which are fixed values assigned directly to variables without computation, and provides an exercise to declare and assign literal values to variables for age, credit card number, and bank balance.
03 hello world with java
03 hello world with javadhrubo kayal This document outlines the basic steps to create a simple "Hello World" Java program in Eclipse, including installing Eclipse, creating a Java project and class, adding a main method, using System.out.println to print a string, and discussing key Java concepts like packages, statements, comments, and questions.
02 what is java
02 what is javadhrubo kayal Java is a powerful and versatile programming language that can be used to create desktop, web, and mobile applications. It is derived from C and C++ but uses object-oriented programming. Java applications run in a virtual machine (JVM) which makes Java cross-platform and sandboxed for security. Popular uses of Java include web applications built with technologies like JSP, Servlets, and Spring that run on application servers, as well as desktop programs and smaller applications for devices.
01 handshake
01 handshakedhrubo kayal Dhrubojyoti Kayal will be leading a Java training session. He introduces himself and asks attendees to share their name, primary skills, years of experience, hobby, and expectations from the training. He outlines some ground rules for the session - participants are encouraged to ask questions, interrupt at any time, collaborate, and ask even simple questions. Attendees should help others if they know more on a topic. During breaks, mobile phones should be switched off or silenced to avoid interruptions. A timekeeper volunteer is needed to help keep track of time.
01 overview-servlets-and-environment-setup
- 2. Introducing ServletsInstalling Tomcat Installing EclipseYour first Java web applicationYour first ServletAgenda
- 3. Static HTML is so boring! – Dynamic content with ServletsA Java program that runs on a server. Follows a standard specification.Standard way to register servlet.Current version 3.0 (JSR 315)We focus on 2.5 (JSR 154) as 3.0 is very newServer forwards incoming request – headers, form data to registered servlet based on URL.Servlet processes data, generates new data and passes back to the server which in turn forwards it to the browserWhat is a servlet?
- 5. EfficientUses threads not OS processes, one servlet instanceConvenientHigh level utility functionsPowerfulData processing, pooling, persistencePortableRuns on any OS where you get JVMInexpensiveBest in class open source servers to run servletsAdvantages
- 6. SecureNo hazards related to process managementPopularMost popular use of Java technologyMedium for large web apps of the scale of Google search Supported byApache, IBM, Oracle, Jetty, Coucho …..Runs onWindows, Unix, MacOS, VMS, IBM Mainframe OSUsed forAll kinds of applications – airline, hotels, banking, insurance …..Advantages
- 8. Java web serverServlet reference implementationhttp://tomcat.apache.orgTomcat 7 – Servlet 3Tomcat 6 – Servlet 2.5DownloadInstallRunSee the web admin consoleShutdownTomcat
- 9. Eclipse IDE (http://www.eclipse.org)Open Source and supported by all biggies in Java businessEclipse 3.5 - GalileoBased on plug-in and OSGi coreFew essential plug-ins Install EclipseRun EclipseShutdown EclipseEclipse IDE
- 10. Setup new Tomcat 6 serverStart ServerStop ServerSetup Tomcat on Eclipse
- 11. Create workspaceCreate web application using EclipseThe project structure in EclipseNeed for web.xmlConfigure Tomcat 6 in EclipseWhat is deployed? – war fileStructure and contents of a blown up war fileManual deployment on TomcatDeploy using admin consoleFirst Web Application
- 12. Ah this web application does nothingLet us create the first servlet on EclipseWhat has changed on the web.xmlDeployWhat changes in the exploded war?Lets send a request for our servletHurray it respondsFirst servlet
- 13. Q&A