Java第四次作业
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39
java/com/demo/ExcelServlet.java
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39
java/com/demo/ExcelServlet.java
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package com.demo;
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import java.io.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import javax.servlet.annotation.WebServlet;
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@WebServlet("/excel.do")
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public class ExcelServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// 设置响应头，告诉浏览器这是一个HTML页面
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response.setContentType("text/html;charset=gb2312");
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// 获取输出流
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PrintWriter out = response.getWriter();
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// 输出HTML内容
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out.println("<!DOCTYPE html>");
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out.println("<html>");
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out.println("<head>");
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out.println("<title>学生信息表</title>");
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out.println("<style>");
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out.println("table { border-collapse: collapse; width: 50%; }");
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out.println("th, td { border: 1px solid black; padding: 8px; }");
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out.println("</style>");
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out.println("</head>");
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out.println("<body>");
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out.println("<h2>学生信息表</h2>");
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out.println("<table>");
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out.println("<tr><th>学号</th><th>姓名</th><th>性别</th><th>年龄</th><th>所在系</th></tr>");
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out.println("<tr><td>95001</td><td>李勇</td><td>男</td><td>20</td><td>信息</td></tr>");
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out.println("<tr><td>95002</td><td>刘晨</td><td>女</td><td>19</td><td>数学</td></tr>");
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out.println("</table>");
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out.println("</body>");
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out.println("</html>");
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}
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}
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37
java/com/demo/GetCookie.java
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37
java/com/demo/GetCookie.java
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package com.demo;
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import java.io.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import javax.servlet.annotation.WebServlet;
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@WebServlet("/GetCookie")
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public class GetCookie extends HttpServlet {
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/**
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*
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*/
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private static final long serialVersionUID = 1L;
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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response.setContentType("text/html");
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PrintWriter out = response.getWriter();
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out.println("<html><title>read cookies</title>");
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out.println("<body><h2>Cookies received from browser:</h2>");
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// 获取客户端发送的所有Cookie
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Cookie[] cookies = request.getCookies();
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if (cookies != null) {
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for (Cookie cookie : cookies) {
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out.println("Name: " + cookie.getName() + ", Value: " + cookie.getValue() + "<br>");
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}
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} else {
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out.println("No cookies found.");
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}
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out.println("</body></html>");
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}
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}
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53
java/com/demo/GuessNumberServlet.java
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53
java/com/demo/GuessNumberServlet.java
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package com.demo;
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import java.io.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import javax.servlet.annotation.WebServlet;
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@WebServlet("/GuessNumberServlet")
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public class GuessNumberServlet extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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int magic = (int) (Math.random() * 101);
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HttpSession session = request.getSession();
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session.setAttribute("num", new Integer(magic));
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response.setContentType("text/html;charset=utf-8");
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PrintWriter out = response.getWriter();
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out.println("<html><body>");
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out.println("我想出一个0到100之间的数，请你猜！");
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out.println("<form action='/helloweb/GuessNumberServlet' method='post'>");
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out.println("<input type='text' name='guess' />");
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out.println("<input type='submit' value='确定'/>");
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out.println("</form>");
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out.println("</body></html>");
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}
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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int guess = Integer.parseInt(request.getParameter("guess"));
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HttpSession session = request.getSession();
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int magic = (Integer) session.getAttribute("num");
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response.setContentType("text/html;charset=utf-8");
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PrintWriter out = response.getWriter();
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out.println("<html><body>");
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if (guess == magic) {
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session.invalidate(); // 销毁会话对象
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out.println("祝贺你，答对了!");
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out.println("<a href='/helloweb/GuessNumberServlet'>再猜一次.</a>");
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} else if (guess > magic) {
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out.println("太大了! 请重猜!");
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} else {
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out.println("太小了! 请重猜!");
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}
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out.println("<form action='/helloweb/GuessNumberServlet' method='post'>");
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out.println("<input type='text' name='guess' />");
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out.println("<input type='submit' value='确定'/>");
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out.println("</form>");
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out.println("</body></html>");
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}
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}
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33
java/com/demo/SendCookie.java
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33
java/com/demo/SendCookie.java
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package com.demo;
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import java.io.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import javax.servlet.annotation.WebServlet;
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@WebServlet("/SendCookie")
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public class SendCookie extends HttpServlet {
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/**
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*
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*/
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private static final long serialVersionUID = 1L;
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws IOException, ServletException {
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// 创建一个Cookie对象
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Cookie userCookie = new Cookie("user", "uid1234");
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// 设置Cookie的有效期为7天
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userCookie.setMaxAge(60 * 60 * 24 * 7);
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// 将Cookie添加到响应中
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response.addCookie(userCookie);
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response.setContentType("text/html");
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PrintWriter out = response.getWriter();
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out.println("<html><title>add cookies</title>");
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out.println("<body><h2>A cookie has been sent to browser</h2></body>");
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out.println("</html>");
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}
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}
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45
java/com/demo/ShowSession.java
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45
java/com/demo/ShowSession.java
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package com.demo;
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import java.io.*;
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import javax.servlet.*;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.*;
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import java.util.Date;
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@WebServlet("/showSession")
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public class ShowSession extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html");
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HttpSession session = request.getSession();
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String heading = null;
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Integer accessCount = (Integer) session.getAttribute("accessCount");
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if (accessCount == null) {
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accessCount = new Integer(0);
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heading = "Welcome, Newcomer";
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} else {
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heading = "Welcome Back.";
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accessCount = new Integer(accessCount.intValue() + 1);
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}
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session.setAttribute("accessCount", accessCount);
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PrintWriter out = response.getWriter();
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out.println("<html><head>");
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out.println("<title>Session Tracking Example</title></head>");
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out.println("<body><center>");
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out.println("<h1>" + heading + "</h1>");
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out.println("<h2>Information about your session.</h2>");
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out.println("<table border='1'>");
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out.println("<tr bgcolor=\"ffad00\"><th>Info Type<th>Value\n");
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out.println("<tr><td>ID<td>" + session.getId() + "\n");
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out.println("<tr><td>Creation Time:<td>");
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out.println("" + new Date(session.getCreationTime()) + "\n");
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out.println("<tr><td>Time of last access:<td>");
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out.println("" + new Date(session.getLastAccessedTime()) + "\n");
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out.println("<tr><td>Access number:<td>" + accessCount + "\n");
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out.println("</table></center></body></html>");
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}
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}
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package com.demo;
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import java.io.*;
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import java.util.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import javax.servlet.annotation.WebServlet;
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@WebServlet("/ExcelServlet")
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public class excel extends HttpServlet{
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public void doGet(HttpServletRequest request,
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HttpServletResponse response)
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throws ServletException, IOException{
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response.setHeader("Content-Encoding","gb2312"); response.setContentType("application/vnd.ms-excel;charset=gb2312");
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PrintWriter out = response.getWriter();
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out.println("学号\t姓名\t性别\t年龄\t所在系");
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out.println("95001\t李勇\t男\t20\t信息");
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out.println("95002\t刘晨\t女\t19\t数学");
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}
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}
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7
webapp/counter.jsp
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7
webapp/counter.jsp
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<html><body>
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<%@ page language="java" %>
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<%! int count = 0; %>
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<% count++; %>
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Welcome! You are visitor number
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<%= count %>
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</body></html>
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8
webapp/errorHandler.jsp
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8
webapp/errorHandler.jsp
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<%@ page contentType="text/html; charset=gb2312" %>
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<%@ page isErrorPage="true" %>
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<html>
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<body>
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请求不能被处理：<%= exception.getMessage() %><br>
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请重试！
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</body>
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</html>
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27
webapp/expression.jsp
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webapp/expression.jsp
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<html><body>
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<%@ page language="java" %>
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<%!
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int anInt = 3;
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boolean aBool = true;
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Integer anIntObj = new Integer(3);
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Float aFloatObj = new Float(8.6);
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String str = "some string";
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StringBuffer sBuff = new StringBuffer();
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public char getChar(){
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return 'A';
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}
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%>
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<%= 500 %>
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<%= anInt*3.5/100-500 %>
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<%= aBool %>
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<%= false %>
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<%= !false %>
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<%= getChar() %>
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<%= Math.random() %>
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<%= aFloatObj %>
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<%= aFloatObj.floatValue() %>
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<%= aFloatObj.toString() %>
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<%= aBool %>
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<% int i = 20; %>
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<% sBuff.setLength(12); %>
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</body></html>
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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<%-- <%@ page language="java" contentType="text/html; charset=UTF-8" --%>
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<%-- pageEncoding="UTF-8"%> --%>
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<!-- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" -->
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<!-- "http://www.w3.org/TR/html4/loose.dtd"> -->
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<!-- <html> -->
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<!-- <head> -->
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<!-- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> -->
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<!-- <title>A Simple JSP page</title> -->
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<!-- </head> -->
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<!-- <body> -->
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<!-- <h3>Hello,World!</h3> -->
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<!-- <font color="#0000ff"> -->
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<%-- The time now is:<%=new java.util.Date()%> --%>
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<!-- </font> -->
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<!-- </body> -->
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<!-- </html> -->
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<%@ page contentType="text/html;charset=gb2312" %>
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<%@ page errorPage="errorHandler.jsp" %>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>A Simple JSP page</title>
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</head>
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<body>
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<h3>Hello,World!</h3>
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<font color="#0000ff">
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The time now is:<%=new java.util.Date()%>
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</font>
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<%
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String name = request.getParameter("name");
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if (name == null) {
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throw new RuntimeException("没有指定name 属性。");
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} else {
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// 将字符串name的字符编码转换为汉字编码
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name = new String(name.getBytes("iso-8859-1"), "gb2312");
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}
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%>
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Hello, <%= name %>
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</body>
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</html>
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</html>
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15
webapp/import_test.jsp
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15
webapp/import_test.jsp
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<%@ page import="java.util.Date,java.text.DateFormat" %>
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<%@ page contentType="text/html;charset=gb2312" %>
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<html>
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<head><title>page指令示例</title></head>
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<body>
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<h3 align="center">使用page指令导入java.util.Date类</h3>
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<%
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Date date = new Date();
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String s = DateFormat.getDateInstance().format(date);
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String s2 = DateFormat.getDateInstance(DateFormat.FULL).format(date);
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%>
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<p align="center">现在的时间是：<%=s%></p>
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<p align="center">现在的时间是：<%=s2%></p>
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</body>
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</html>
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34
webapp/persistent_counter.jsp
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34
webapp/persistent_counter.jsp
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<%@ page language="java" import="java.io.*" %>
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<%!
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int count = 0;
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String dbPath;
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public void jspInit() {
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try {
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dbPath = getServletContext().getRealPath("/WEB-INF/counter.db");
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FileInputStream fis = new FileInputStream(dbPath);
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DataInputStream dis = new DataInputStream(fis);
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count = dis.readInt();
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dis.close();
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} catch (Exception e) {
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log("Error loading persistent counter", e);
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}
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}
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public void jspDestroy() {
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try {
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FileOutputStream fos = new FileOutputStream(dbPath);
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DataOutputStream dos = new DataOutputStream(fos);
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dos.writeInt(count);
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dos.close();
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} catch (Exception e) {
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log("Error storing persistent counter", e);
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}
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}
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%>
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<%-- 下面是向浏览器输出的主要内容，它将成为产生的_jspService()方法的一部分 --%>
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<html><body>
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<% count++; %>
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Welcome! You are <%= count %> th visitor(s).
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</body></html>
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