Java Tomcat JSP HTTP Request and Response -----1

(1)HTTP stands for HypeText transfer protocol, and is the network protocol used on the web.It turns on top of the TCP/IP.

(
2)Http uses a request /response model- the client makes an http request and the webserver gives back and http response that the browser then figures out how to handle(depending on the content tupe of the response).

(3)If the response from the server is an HTML page,the HTML is added to HTTP response.

(4)An Http request includes the request URL(the resouce the client is trying to access), the HTTP method(Get, POST,etc), and(Optional) from parameter data(also called the "query string")..

(5)A GET request appends the data to the end of the URL

(
6)A POST request include the form data in the body of the request

(7)A MIME type tells the browser what kind of data the browser is about to receive so that the browser will know what to do with it(render the HTML, display the graphic, play the music,etc)

(8)URL stands for Uniform resource locator. Every resource on the web has its own unique address in this format .It starts with a protocol, follwoed  bu the server name, an optional port number, and usually a specific path and resource name , it can also include an optional query string, if the URL is for a GET request.

(9)Web servers are good at serving static HTML pages, but if you need dynamically generated data in the page (The currently time,for example), you need some kind of helper app that can work with the server. The non-java term for these helper apps(Most oftern written in perl) is CGI(which stands for comon gateway Interface)

(10)Putting HTML inside a println() statement is uglyu and error-prone but JSPs solve that problem by letting you put java into HTML rather than putting HTML into JAVA code.
资源下载链接为: https://pan.quark.cn/s/22ca96b7bd39 在 IT 领域,文档格式转换是常见需求,尤其在处理多种文件类型时。本文将聚焦于利用 Java 技术栈,尤其是 Apache POI 和 iTextPDF 库,实现 doc、xls(涵盖 Excel 2003 及 Excel 2007+)以及 txt、图片等格式文件向 PDF 的转换,并实现在线浏览功能。 先从 Apache POI 说起,它是一个强大的 Java 库,专注于处理 Microsoft Office 格式文件,比如 doc 和 xls。Apache POI 提供了 HSSF 和 XSSF 两个 API,其中 HSSF 用于读写老版本的 BIFF8 格式(Excel 97-2003),XSSF 则针对新的 XML 格式(Excel 2007+)。这两个 API 均具备读取和写入工作表、单元格、公式、样式等功能。读取 Excel 文件时,可通过创建 HSSFWorkbook 或 XSSFWorkbook 对象来打开相应格式的文件,进而遍历工作簿中的每个 Sheet,获取行和列数据。写入 Excel 文件时,创建新的 Workbook 对象,添加 Sheet、Row 和 Cell,即可构建新 Excel 文件。 再看 iTextPDF,它是一个用于生成和修改 PDF 文档的 Java 库,拥有丰富的 API。创建 PDF 文档时,借助 Document 对象,可定义页面尺寸、边距等属性来定制 PDF 外观。添加内容方面,可使用 Paragraph、List、Table 等元素将文本、列表和表格加入 PDF,图片可通过 Image 类加载插入。iTextPDF 支持多种字体和样式,可设置文本颜色、大小、样式等。此外,iTextPDF 的 TextRenderer 类能将 HTML
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