メソッドdoPost、eclipseとサーブレットでのifの割り当て

これはコードで間違っていますか？私があればと答えのHttpServletを作りたいが、左側を」私が表示され、『割り当てが他の最後に』変数でなければなりません、私は正しく、私はそれを修正することができますどのように、メソッドを宣言することはできません？メソッドdoPost、eclipseとサーブレットでのifの割り当て

package controladores; 

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; 

/** 
* Servlet implementation class AjaxController 
*/ 
@WebServlet("/AjaxController") 
public class AjaxController extends HttpServlet { 
    private static final long serialVersionUID = 1L; 

    /** 
    * @see HttpServlet#HttpServlet() 
    */ 
    public AjaxController() { 
     super(); 
     // TODO Auto-generated constructor stub 
    } 

    /** 
    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
    */ 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 

    } 



    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
     response.setContentType("text/plain "); 

     PrintWriter out = response.getWriter(); 
     String action = request.getParameter("action"); 

     if(action.equals("demo1")){ 
      String nombreCompleto = request.getParameter("nombreCompleto"); 
      out.println("Hola " + nombreCompleto); 
     } 
     else if (action.equals("demo2")){ 
      int a = Integer.parseInt(request.getParameter("numero1")); 
      int b = Integer.parseInt(request.getParameter("numero2")); 
      out.println(a + b); 
     } else(action.equals("demo3")){ 
      int d = Integer.parseInt(request.getParameter("numa")); 
      int c = Integer.parseInt(request.getParameter("numb")); 
      out.println(c * d); 
     } 



    } 
}

とindex.jspの

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 

<!DOCTYPE html> 
<html> 
    <head> 
     <title>Demo Ajax</title> 

<link href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.98.2/css/materialize.min.css" rel="stylesheet"/> 
<link href="" rel="stylesheet"/> 
<link type="text/css" rel="stylesheet" href="resources/css/miPrimerCSS.css" /> 

<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.98.2/js/materialize.min.js"></script> 
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js" type="text/javascript"></script> 
<script type="text/javascript"> 



    $(document).ready(function(){ 
    $('#unHola').click(function(){ 
     var nombreCompleto = $('#nombreCompleto').val(); 
     $.ajax({ 
      type:'POST', 
      data: { 
       nombreCompleto : nombreCompleto, 
       action: 'demo1' 
      }, 
      url: 'AjaxController', 
      success: function(result){ 
       $('#resultadoNombre').html(result); 
      } 

     }); 
    }); 

    $('#unaSuma').click(function(){ 
     var numero1 = $('#numero1').val(); 
     var numero2 = $('#numero2').val(); 
     $.ajax({ 
      type:'POST', 
      data: { 
       numero1 : numero1, 
       numero2 : numero2, 
       action: 'demo2' 
      }, 
      url:'AjaxController', 
      success : function(result){ 
       $('#resultadoSuma').html(result); 
      } 

     }); 
    }); 

    $('#unProducto').click(function(){ 
     var numero1 = $('#numa').val(); 
     var numero2 = $('#numb').val(); 
     $.ajax({ 
      type:'POST', 
      data: { 
       numa : numa, 
       numb : numb, 
       action: 'demo3' 
      }, 
      url:'AjaxController', 
      success : function(result){ 
       $('#resultadoProd').html(result); 
      } 

     }); 
    }); 
}); 

</script> 
</head> 

<body> 



<nav> 


    <div class="nav-wrapper"> 

    <a href="#!" class="brand-logo"> Logo</a> 
    <ul class="right hide-on-med-and-down"> 
     <li><a href="sass.html">Home</a></li> 
     <li><a href="badges.html">Pages</a></li> 
     <li><a href="badges.html">About us</a></li> 
     <li><a href="badges.html">Lab</a></li> 
     <!-- Dropdown Trigger --> 
     <!-- <li><a class="dropdown-button" href="#!" data-activates="dropdown1">Dropdown<i class="material-icons right">arrow_drop_down</i></a></li> --> 
    </ul> 
    </div> 
</nav> 






    <div class="container"> 
     <p class="z-depth-5"> 
    <fieldset> 
     <h3>Un Hola</h3> 
      <form> 
       Introduce tu nombre <input type="text" id="nombreCompleto"><br> 
       <input type="button" value="Hola" id="unHola"><br> 
       <span id="resultadoNombre"></span> 
      </form> 
    </fieldset> 
    </div> 

    <br><br> 


    <div class="container"> 
    <fieldset> 
     <h3>Una Suma</h3> 
     <form> 
      Numero 1 <input type="text" id="numero1"><br> 
      Numero 2 <input type="text" id="numero2"><br> 
      Resultado <span 
       id=resultadoSuma></span><br> <input type="button" value="Suma" 
       id="unaSuma"> 
     </form> 
     </fieldset> 
    </div> 

    <div class="container"> 
    <fieldset> 
     <h3>Un Producto</h3> 
     <form> 
      Numero 1 <input type="text" id="numero1"><br> 
      Numero 2 <input type="text" id="numero2"><br> 
      Resultado <span id=resultadoProd></span><br> <input type="button" value="Producto" 
       id="unProducto"> 
     </form> 
     </fieldset> 
    </div> 







     <footer class="page-footer"> 
      <div class="container"> 
      <h5 class="white-text">Footer Content</h5> 

       </div> 


      <div class="footer-copyright"> 
      <div class="container"> 
      © 2014 Copyright Text 
      <a class="grey-text text-lighten-4 right" href="#!">More Links</a> 
      </div> 
      </div> 
     </footer> 
    </body> 

</html>

出典

2017-06-05 Gerardo Bautista

エラーメートルをご提示くださいエッセージ –