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首页"适合初学者的WEB应用开发课程源码，帮助入门的程序1.1"

"适合初学者的WEB应用开发课程源码，帮助入门的程序1.1"

javaweb

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The WEB application development course program source code provided is specifically aimed at beginners and is highly beneficial for those looking to learn Java web programming. The program source code includes an index.html file with the proper DOCTYPE declaration and meta tags for content type and language. The file is structured to create a basic webpage layout for the New Century Web Bookstore, with a specified background color. The code adheres to the XHTML 1.0 Strict standard and includes the necessary elements for creating a well-formed HTML document. This can serve as a great starting point for learners to understand the structure and syntax of HTML, as well as how to create a simple webpage for a fictional bookstore. The use of Chinese language in the meta tags also provides an example of how to specify the content language for multilingual webpages. Overall, this program source code is a valuable resource for beginners to practice and gain a deeper understanding of web application development. It sets a solid foundation for learning and mastering Java web programming techniques. With its clear and well-documented structure, the source code helps individuals grasp the basics of creating webpages and gain hands-on experience in web development. It is an excellent starting point for those looking to pursue a career in web development or simply enhance their programming skills.

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_____________________________________________________________________________▃

程序2.8 hello.jsp

<html>

<body><h4>Your are welcome!</h4>

<%=request.getAttribute("username")%>

</body>

</html>

_____________________________________________________________________________▃

程序2.9 ExcelServlet.java

package com.demo;

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class ExcelServlet extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException{

//指定页面在传输过程中使用的编码方式

response.setHeader("Content-Encoding","gb2312");

response.setContentType("application/vnd.ms-excel;charset=gb2312");

PrintWriter out = response.getWriter();

out.println("学号\t 姓名\t 性别\t 年龄\t 所在系");

out.println("95001\t 李勇\t 男\t20\t 信息");

out.println("95002\t 刘晨\t 女\t19\t 数学");

}

_____________________________________________________________________________▃

程序2.10 FileDownloadServlet.java

package com.demo;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class FileDownloadServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

response.setContentType("application/jar");

// 设置响应头，将响应内容以指定的文件名存储到客户机上

response.setHeader("Content-Disposition","attachment;filename=servlet-api.jar");

File f = new File("C:\\servlet-api.jar");

FileInputStream is = new FileInputStream(f);

ServletOutputStream os = response.getOutputStream();

byte[] bytearray = new byte[1024];

int bytesread = 0;

while( (bytesread = is.read(bytearray) ) != -1 ){

os.write(bytearray, 0, bytesread);

}

os.flush();

}

_____________________________________________________________________________▃

程序2.11 ShowTimeServlet.java

package com.demo;

import java.io.*;

import java.util.*;

import java.text.SimpleDateFormat;

import javax.servlet.*;

import javax.servlet.http.*;

public class ShowTimeServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

response.setContentType("text/html;charset=gb2312");

response.setHeader("Refresh","5");

PrintWriter out = response.getWriter();

Date date = new Date();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd a HH:mm:ss");

String s = sdf.format(date); // 对日期对象格式化

out.println("<html>");

out.println("<body>");

out.println("<h3 align=\"center\">每 5 秒钟刷新一次页面</h3><p>");

out.println("<h3 align=\"center\">现在的时间是："+s+"</h3><p>");

out.println("</body>");

out.println("</html>");

}

_____________________________________________________________________________▃

程序2.12 RedirectServlet.java

package com.demo;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class RedirectServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

String userAgent = request.getHeader("User-Agent");

if((userAgent!=null)&&(userAgent.indexOf("MSIE")!=-1)){

response.sendRedirect("http://www.microsoft.com");

return;

}else{

response.sendRedirect("http://home.netscape.com");

return;

}

_____________________________________________________________________________▃

程序3.1 web.xml 文件。

<?xml version="1.0" encoding="UTF-8" ?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

version="2.5">

<display-name> Webapp Test </display-name>

<context-param>

<param-name>email</param-name>

<param-value>hacker@163.com</param-value>

</context-param>

<servlet-name>loginServlet</servlet-name>

<servlet-class>com.demo.LoginServlet</servlet-class>

<init-param>

<param-name>greeting</param-name>

<param-value>Good Morning</param-value>

</init-param>

<load-on-startup>2</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>loginServlet</servlet-name>

<url-pattern>/login.do</url-pattern>

</servlet-mapping>

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