servlet--calculator.rar_calculator servlet_servlet加减乘除

package com.apps; 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; public class Jisuan extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub resp.setCharacterEncoding("gb2312"); PrintWriter out=resp.getWriter(); double a=0; double b=0; double m=0; ; try{ a=Double.parseDouble(req.getParameter("a")); b=Double.parseDouble(req.getParameter("b"));} catch(NumberFormatException e1){ out.println("请输入数字"); return; } String c=req.getParameter("fuhao"); if(c.equals("jia")) { m=a+b; out.print(m); } else if(c.equals("jian")) { m=a-b; out.print(m); } else if(c.equals("cheng")) { m=a*b; out.print(m); } else if(c.equals("chu")) { m=a/b; out.print(m); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub this.doGet(req, resp); } }