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Questions and Answers
What is a servlet?
Which of the following is an advantage of servlets over CGI?
Servlets are platform-independent.
True
What Java API do servlets integrate with for database access?
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What are the lifecycle methods of a servlet?
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Which method is NOT typically used by servlets to handle HTTP requests?
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Servlets support __________ for maintaining state across requests.
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What is one security feature of servlets?
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How are servlet applications typically executed?
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Servlets can handle multiple requests simultaneously.
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Study Notes
Servlets
- A servlet is a Java program that extends the capabilities of servers that host applications.
- Servlets handle HTTP requests from web clients.
- Servlets are executed on the server side of a web connection.
Servlet Advantages over CGI
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Performance and Scalability
- Instances reuse: Servlets load into memory once and persist across requests, unlike CGI scripts which spawn a new process each request.
- Multithreading: Servlets handle requests concurrently using Java threads, improving resource utilization and scalability.
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Portability
- Servlets run on any JVM, making applications platform-independent.
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Integration with Java Ecosystem
- Seamless integration with other Java technologies like JDBC, JNDI, JSP, EJB, and JavaMail.
- Leverages Java’s object-oriented capabilities for enhanced functionality and maintainability.
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Robust API
- Servlet API provides functionalities for session management, cookies, context data, and request parsing.
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Security
- Servlets utilize Java’s built-in security features, like the security manager and access to third-party libraries, making them more secure than CGI scripts.
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Efficient resource management
- Servlets manage resources like database connections efficiently through pooling and reuse.
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Community and support
- Large developer community, extensive documentation, and various tools and servers support servlets.
Servlet Features
- Platform independence: Written in Java and run on any JVM.
- Server-side processing: Handle requests from web clients and generate responses.
- Integration with web servers: Operate within a web server or servlet container.
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Request and response handling: Handle HTTP requests and responses using methods like
doGet(),doPost(),doPut(),doDelete(), etc. -
Session management: Manage sessions using
HttpSessionfor tracking user interactions. - Concurrency: Support multiple simultaneous requests through threading.
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Lifecycle Methods: Lifecycle methods like
init(),service(), anddestroy()manage initialization, request processing, and cleanup. - Support for cookies and URL rewriting: Maintain state across requests.
- Request dispatching: Forward requests to other web resources like JSP files.
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Description
This quiz covers the fundamentals of Java Servlets, including their role in handling HTTP requests and the advantages they offer over CGI. Test your knowledge on servlet performance, scalability, portability, and integration with the Java ecosystem.
