在idea中编写jsp，编写servlet，产生一个1

2023-05-29 14:57| 来源: 网络整理| 查看: 265

编写servlet，产生一个1-10的随机数，将其保存到session中，然后重定向到输入页面sendMsg.jsp，在此页面输入所猜测的数后，提交到另一个servlet判断是否正确，若不正确，转发到sendMsg.jsp，在此页面显示“大了”或“小了”的提示信息，若正确，则在新页面显示“答对了”。(网页版的猜数游戏)

首先创建FirstServlet，该为产生的随机数的。代码如下所示：

package Servlet; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class FirstServlet extends HttpServlet { public void init(ServletConfig config)throws ServletException { super.init(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); int msg = Integer.parseInt(request.getParameter("msg")); //float msg = Float.parseFloat(request.getParameter("msg")); HttpSession session = request.getSession(); int num = (int) session.getAttribute("num"); if (msg == num){ response.sendRedirect("printfMsg.jsp"); }else { String m = msg > num ? "大了" : "小了"; request.setAttribute("m",m ); request.getRequestDispatcher("sendMsg.jsp").forward(request,response); } } }

接下来创建PutServlet，该为判断是否正确，代码如下所示：

package Servlet; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; import java.util.Random; public class PutServlet extends HttpServlet { public void init(ServletConfig config)throws ServletException { super.init(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Random random = new Random(); int num = random.nextInt(10)+1; System.out.println(num); HttpSession session = request.getSession(); session.setAttribute("num", num); //将用户名保存到session System.out.println(num); response.sendRedirect("sendMsg.jsp"); //重定向到sendMsg.jsp } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } }

接下来编写页面sendMsg，代码如下所示：

Title ${m}

紧接着编写更新了猜对了页面，代码如下所示：

Title 恭喜你猜对了~ ${msg}

最后编写web.xml文件，代码如下所示：

de Servlet.FirstServlet de /ser dei Servlet.PutServlet dei /put

最后的运行效果先输入put回车，然后它会跳转到sendMsg页面，直到输入正确的数字才会跳转到猜对了的页面，效果图如下图所示：

当我输入9时，提示词为大了，

知道输入正确的数字后跳转到猜对了的页面

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