来自控制器的错误响应 JSP

Question

我正在尝试使用 Controller 和模型做一个 JSP 教程，它是一个简单的表单，可以接收一些数据、进行一次计算和 returns 一个文本。该教程在这个 youtube 视频中： enter link description here 但是我尝试在 Eclipse 中的 Netbeans 中做同样的事情。当我发送日期时，我得到这个：

但我希望通过表格获得数据的响应。这是我的控制器代码：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException{
        response.setContentType("text/html;charset=UTF-8");
        Calcular obj = new Calcular();
        obj.setNombre(request.getParameter("usuario"));
        obj.setDireccion(request.getParameter("direccion"));
        obj.setNumDiasTrabajados(Integer.parseInt(request.getParameter("dias")));
        obj.setValorDia(Double.parseDouble(request.getParameter("valor")));
        obj.Salario();
        
        request.setAttribute("ObjetoJava", obj);
        
        try (PrintWriter out = response.getWriter()){
            //out.println("Controlador");
            RequestDispatcher a=request.getRequestDispatcher("index.jsp");
            a.forward(request, response);
            
        }
    }

这是index.jsp中的代码：

<%
    Calcular obj = new Calcular(); 
    obj = (Calcular)request.getAttribute("ObjetoJava");
    if(obj != null){
        out.println(obj.getNombre());
        out.println(obj.getDireccion());
        out.println(obj.getNumDiasTrabajados());
        out.println(obj.getValorDia());
        out.println(obj.getSalario());
        
        
    }
 %>

这是在 Controlador.java 中发送的代码：

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.getWriter().append("Served at: ").append(request.getContextPath());
}

我做错了什么？

Controlador.java:

package ctr;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import modelo.Calcular;

/**
* Servlet implementation class Controlador
*/
@WebServlet("/Controlador")
public class Controlador extends HttpServlet {


protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException{
        response.setContentType("text/html;charset=UTF-8");
        Calcular obj = new Calcular();
        obj.setNombre(request.getParameter("usuario"));
        obj.setDireccion(request.getParameter("direccion"));
        obj.setNumDiasTrabajados(Integer.parseInt(request.getParameter("dias")));
        obj.setValorDia(Double.parseDouble(request.getParameter("valor")));
        obj.Salario();
        
        request.setAttribute("ObjetoJava", obj);
        
        try (PrintWriter out = response.getWriter()){
            //out.println("Controlador");
            RequestDispatcher a=request.getRequestDispatcher("index.jsp");
            a.forward(request, response);
            
        }
    }

/*  
private static final long serialVersionUID = 1L;
   
/**
 * @see HttpServlet#HttpServlet()
 */
public Controlador() {
    super();
    // TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.getWriter().append("Served at: ").append(request.getContextPath());
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

}

index.jsp:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@page import="modelo.Calcular" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action = "Controlador" method = "POST">
 <table>
   <tr>
     <td>Nombre</td><td><input type="text" placeholder="Nombre" name="usuario"/></td>
   </tr>
   <tr>
     <td>Direccion</td><td><input type="text" placeholder="Direccion" name="direccion"/></td>
   </tr>
   <tr>
     <td># Dias Trabajados</td><td><input type="text" placeholder="# Dias Trabajados" name="dias"/></td>
   </tr>
   <tr>
     <td>Valor dias</td><td><input type="text" placeholder="Valor dia" name="valor"/></td>
   </tr>

   <tr>
     <td><button type ="submit">Calcular</button></td>
   </tr>

 </table>
 
 <%
    Calcular obj = new Calcular(); 
    obj = (Calcular)request.getAttribute("ObjetoJava");
    if(obj != null){
        out.println(obj.getNombre());
        out.println(obj.getDireccion());
        out.println(obj.getNumDiasTrabajados());
        out.println(obj.getValorDia());
        out.println(obj.getSalario());
        
        
    }
 %>
 
 </form>
 </body>
 </html>

Answer 1

您的表单方法调用 doPost:

当您点击提交时，它会转到“/Controlador”，在那里它会查找 doPost 并在 doPost 中调用 doGet 而不是调用 doGet，您应该调用：processRequest

试试这个：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException{
            response.setContentType("text/html;charset=UTF-8");
            Calcular obj = new Calcular();
            obj.setNombre(request.getParameter("usuario"));
            obj.setDireccion(request.getParameter("direccion"));
            obj.setNumDiasTrabajados(Integer.parseInt(request.getParameter("dias")));
            obj.setValorDia(Double.parseDouble(request.getParameter("valor")));
            obj.Salario();
            
            request.setAttribute("ObjetoJava", obj);
            
            try (PrintWriter out = response.getWriter()){
                //out.println("Controlador");
                RequestDispatcher a=request.getRequestDispatcher("index.jsp");
                a.forward(request, response);
                
            }
        }
    
    /*  
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Controlador() {
        super();
        // TODO Auto-generated constructor stub
    }
    
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
   response.getWriter().append("Served at: ").append(request.getContextPath());
    }
    
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response); 
    }

来自控制器的错误响应 JSP

Wrong response from controller JSP

java

jsp

controller