Servlets are an integral part of any J2EE Web application. The key benefits of using Servlets in our web applications are:
a. They are faster than CGI scripts because each CGI script produces an entirely new process that takes a lot of time to execute, whereas a servlet creates only a new thread.
b. Servlet API is standard and available easily on the internet (like JSPs)
c. Servlets have the advantages like ease of development & platform independence (like Java)
d. They can access all the J2SE and J2EE APIs
e. Can take the full advantage & capabilities of the Java programming langauge
As you can see, there are numerous advantages of using the Servlet & JSP technologies. This is exactly why numerous organizations use them as a staple part of their J2EE application development work.
The Disadvantage would be that Servlets are a little difficult to learn and use.
Servlets are the Java platform technology of choice for extending and enhancing Web servers. Servlets provide a component-based, platform-independent method for building Web-based applications, without the performance limitations of CGI programs.Servlets create dynamic web pages.
The advantage of Servlets is,
n Portability
o Portable across operating systems and across web servers
n Power
o Harness the full power of the core Java APIs: networking and URL access, multithreading, image manipulation, data compression, JDBC, object serialization, internationalization
n Efficiency & Endurance
o Memory resident, so invocation highly efficient---no process to spawn or interpreter to invoke
n Safety
o Support safe programming since inherit Java's strong type safety, exception-handling mechanism
n Elegance
o Code is clean, object-oriented, modular, and simple (i.e.. Session tracking, cookie)
n Integration
o Tightly integrated with the server---translate file paths, perform logging, check authorization, and MIME type mapping
The disadvantage of Servlets is,
n Web Administrator will need to learn how to install and maintain Java Servlets
n Tedious uses of out.println() statements
o Can be remedied by using Java Server Page (JSP)
As a long time user of LibreOffice (mainly writer and calc) I can see no disadvantages. It is a complete office suit, and is free - two very good advantages.
HttpServletRequest
Tomcat is a server. It is used to deploy and run Servlets and not compile them. A Servlet is a java file and has to be compiled just like any other Java Class.
Circular queues are very efficient and work well with low level codes. Ordinary queues are the standard type of queue but they do not maximize memory data well.
advantages of data manipulation language:1.the DML statements can modify the data stored in a database.2.user can specify what data is needed.3.dml tends to have many different flavours and capabilities between database vendors.4.it provides efficient human interaction with the system.disadvantages of data manipulation language:1.dml cannot be used to change the database structure.2.tables or columns cannot be created or deleted using dml.
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