2024年5月16日发(作者：联想a850十)

毕业设计说明书

英文文献及中文翻译

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Java and the Internet

If Java is, in fact, yet another computer programming language, you may question

why it is so important and why it is being promoted as a revolutionary step in

computer programming. The answer isn’t immediately obvious if you’re coming from

a traditional programming perspective. Although Java is very useful for solving

traditional standalone programming problems, it is also important because it will

solve programming problems on the World Wide Web.

What is the Web?

The Web can seem a bit of a mystery at first, with all this talk of “surfing,”

“presence,” and “home pages.” It’s helpful to step back and see what it really is, but

to do this you must understand client/server systems, another aspect of computing

that’s full of confusing issues.

Client/Server computing

The primary idea of a client/server system is that you have a central repository of

information—some kind of data, often in a database—that you want to distribute on

demand to some set of people or machines. A key to the client/server concept is that

the repository of information is centrally located so that it can be changed and so that

those changes will propagate out to the information consumers. Taken together, the

information repository, the software that distributes the information, and the

machine(s) where the information and software reside is called the server. The

software that resides on the remote machine, communicates with the server, fetches

the information, processes it, and then displays it on the remote machine is called the

client.

The simple idea of distributing information has so many layers of complexity

that the whole problem can seem hopelessly enigmatic. And yet it’s crucial:

Client/server computing accounts for roughly half of all programming activities. It’s

responsible for everything from taking orders and credit-card transactions to the

distribution of any kind of data—stock market, scientific, government, you name it.

What we’ve come up with in the past is individual solutions to individual problems,