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POPassing calculation result to JSP page
 

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    <p>Index.jsp takes two input number and after submit the request go to Operation.java. It has a radio button to select Operation. Both inputs and radio button are submitted to Operation.java.</p> <pre><code>&lt;body&gt; &lt;h1&gt;Easy way to do fast operation&lt;/h1&gt; &lt;form action="Operation"&gt; First number::&lt;input type="text" name="firstno"&gt;&lt;/input&gt;&lt;/br&gt;&lt;/br&gt; Second number::&lt;input type="text" name="Secondno"&gt;&lt;/input&gt;&lt;/br&gt;&lt;/br&gt; &lt;input type="radio" name="option" value="add"&gt;Add&lt;/input&gt; &lt;input type="radio" name="option" value="substract"&gt;Subtract&lt;/input&gt; &lt;input type="radio" name="option" value="mul"&gt;Multiply&lt;/input&gt; &lt;input type="radio" name="option" value="divide"&gt;Divide&lt;/input&gt; &lt;/br&gt;&lt;/br&gt; &lt;input type="submit" value="submit"/&gt; &lt;/form&gt; &lt;%if(request.getAttribute("res")!=null){%&gt; The result is ::${res} &lt;%}%&gt; &lt;/body&gt; </code></pre> <p>Operation.java(Servlet) takes value from input button and do calculation based on the radio button click. It will calculate the result.</p> <pre><code>int result1=0; int n1=Integer.parseInt(request.getParameter("firstno")); int n2=Integer.parseInt(request.getParameter("Secondno")); String radio=request.getParameter("option"); if(radio.equals("add")) { result1=n1+n2; } else if(radio.equals("substract")) { result1=n1-n2; } else if(radio.equals("mul")) { result1=n1*n2; } request.setAttribute("res", result1); RequestDispatcher requestDispatcher = request.getRequestDispatcher("index.jsp"); requestDispatcher.forward(request, response); </code></pre> <p>After calculation I want to show the result on the index.jsp. How can I do that?</p>
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    1. COuse request.setAttribute("result1Name",result1);
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    2. CO@gjman2 But I want to get the result after clicking on submit button. not before. In this case in Index Page I always get the result value.
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    3. COSo after edited, it is working?
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