53 lines
2.1 KiB
Java
53 lines
2.1 KiB
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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