Question

是java web计算器的客户端，当我输入数字的值并单击计算结果为0时。

这是index.jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Calculadora</title>
</head>
<body>
    <hr/>
    <div align="center">
        <form action="calcular.do" style="font-family:arial">
        Numero 1:<br>
        <input type="text" name="num1" 
               style="text-align:right"/><br><br>
        Numero 2:<br>
        <input type="text" name="num2" 
               style="text-align:right"/><br><br>

        <input type="radio" name="operacion" value="Suma" checked="true"  />
        Suma<br>
        <input type="radio" name="operacion" value="Resta" />
        Resta<br>
         <input type="radio" name="operacion" value="Multiplicacion" />
        Multiplicacion<br>
         <input type="radio" name="operacion" value="division" />
        Divison<br>
        <input type="submit" value="calcular" name="Calcular" />
        <br><br>
        Resultado:<br>
        <input type="text" name="resultado" value="${result}"
               style="text-align:right"/><br><br>
        </form>
        <hr/>
    </div>
 </body>
 </html>

这是servlet calcular.java

package controlador;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet(name = "Calcular", urlPatterns = {"/calcular.do"})
public class Calcular extends HttpServlet {

protected void processRequest(HttpServletRequest request,    HttpServletResponse response)
        throws ServletException, IOException {
String number1 = request.getParameter("num1");
String number2 = request.getParameter("num2");
if(number1 !=null && !number1.isEmpty() && number2 !=null && !number2.isEmpty()){

jaxws.SWCalculator_Service service;
jaxws.SWCalculator port;

try{
service= new jaxws.SWCalculator_Service();
port=service.getSWCalculatorPort();
double num1 = Double.parseDouble(number1);
double num2= Double.parseDouble(number2);
double resultado=0;
String operacion = request.getParameter("operacion");
if (operacion.equals("suma")){
resultado = port.suma(num1, num2);
}
if (operacion.equals("resta")){
resultado = port.resta(num1, num2);
}
if (operacion.equals("multiplicacion")){
resultado = port.multiplicacion(num1, num2);
}
if (operacion.equals("division")){
resultado = port.division(num1, num2);
}
double respuesta = resultado;
request.setAttribute("result",respuesta);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
catch (NumberFormatException ex)
{
    System.out.println("numero incorrecto\n");  
}
catch (Exception ex)
{
    System.out.println(ex.getMessage());  
}
}
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}


@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}


@Override
public String getServletInfo() {
    return "Short description";
}// </editor-fold>

}

计算器通过输入2个数字并通过单选按钮选择操作（加法，减法，乘法和除法）来工作，当点击提交按钮时，必须给出操作的结果。

Answer 1

尝试更改值=＆＃34; $ {result}＆＃34; to value =＆＃34; $ {requestScope.result}＆＃34;

<input type="text" name="resultado" value="${requestScope.result}"
           style="text-align:right"/>

WebServices Calculator客户端不起作用

1 个答案: