什么是JSP？JSP介绍

什么是JSP？

简明扼要地说，JSP是一种用来开发含有动态内容网页的技术。纯HTML页面只包含静态的内容，它的内容通常保持不变，而JSP页面则不同，它可以根据任意数量的变量来改变自己的内容，这些变量包括用户的身份信息，用户使用的浏览器类型，用户提供的信息，以及用户所做的选择等。

JSP页面就和常规的网页一样，包含标准的标记语言元素，例如HTML的标签。然而，JSP页面还包含特殊的JSP元素，这些元素使得服务器可以把动态内容插入到网页中。JSP元素的用途非常广泛，例如从数据库取得信息，或记录用户的个性信息。当用户请求一个JSP页面时，服务器先执行JSP元素，并把结果同网页的静态部分相结合，然后把动态合成后的页面送回到浏览器。

What Is JAVA Server Pages?

Put succinctly, JAVA Server Pages is a technology for developing web pages that include dynamic content. Unlike a plain HTML page, which contains static content that always remains the same, a JSP page can change its content based on any number of variable items, including the identity of the user, the user's browser type, information provided by the user, and selections made by the user.

A JSP page contains standard markup language elements, such as HTML tags, just like a regular web page. However, a JSP page also contains special JSP elements that allow the server to insert dynamic content in the page. JSP elements can be used for a variety of purposes, such as retrieving information from a database or registering user preferences. When a user asks for a JSP page, the server executes the JSP elements, merges the results with the static parts of the page, and sends the dynamically composed page back to the browser.