文章摘要
这篇文章介绍了一个名为`HandleGuess`的JavaServlet类，继承自`javax.servlet.http.HttpServlet`。该类的核心功能是实现一个猜数游戏。在`doPost`方法中，程序读取客户端提交的数值（`guessnumber`）和会话中保存的数值（`saveNumber`），并通过比较这两个数值来确定用户的猜测是偏大、偏小还是正确，并根据比较结果动态重定向至`inputNumber.jsp`页面。`doGet`方法直接调用`doPost`方法，用于处理客户端的GET请求。文章主要展示了如何通过Servlet处理网络请求，并实现简单的动态页面重定向功能。
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class HandleGuess extends HttpServlet {
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
request.setCharacterEncoding(“utf-8”);
response.setContentType(“text/html;charset=utf-8”);
PrintWriter out=response.getWriter();
//获取客户猜测提交的数
int guessNumber=Integer.parseInt(request.getParameter(“guessnumber”));
//获取客户的会话对象
HttpSession session=request.getSession();
Integer integer=(Integer)session.getAttribute(“saveNumber”);
int realNumber=integer.intValue();
System.out.println(realNumber);
System.out.println(guessNumber);
if(guessNumber>realNumber){
session.setAttribute(“message”, “您猜大了”);
System.out.println(“您猜大了—no”);
response.sendRedirect(“inputNumber.jsp”);
}
else if(guessNumber<realNumber){
session.setAttribute(“message”, “您猜小了”);
System.out.println(“您猜小了—no”);
response.sendRedirect(“inputNumber.jsp”);
}
else{
session.setAttribute(“message”, “您猜对了”);
System.out.println(“您猜对了”);
response.sendRedirect(“inputNumber.jsp”);
}
}
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
doPost(request,response);
}
}