Created
October 3, 2020 05:19
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Calculator Servlet
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| package com.java; | |
| 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 javax.servlet.http.HttpSession; | |
| public class Calculator extends HttpServlet { | |
| private static final long serialVersionUID = 1L; | |
| protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { | |
| String num1 = request.getParameter("num1"); | |
| String num2 = request.getParameter("num2"); | |
| String op = request.getParameter("op"); | |
| String result = ""; | |
| int a, b; | |
| try { | |
| a = Integer.parseInt(num1); | |
| b = Integer.parseInt(num2); | |
| if (op.equals("+")) { | |
| result = String.valueOf(a + b); | |
| } else if (op.equals("-")) { | |
| result = String.valueOf(a - b); | |
| } else if (op.equals("*")) { | |
| result = String.valueOf(a * b); | |
| } else if (op.equals("/")) { | |
| if (b == 0) { | |
| result = ""; | |
| } else { | |
| result = String.valueOf(a / b); | |
| } | |
| } else { | |
| op = ""; | |
| result = ""; | |
| } | |
| } catch (NumberFormatException ex) { | |
| op = ""; | |
| num1 = ""; | |
| num2 = ""; | |
| result = ""; | |
| } | |
| PrintWriter out = response.getWriter(); | |
| out.write( | |
| "<html>" + | |
| "<body>" + | |
| "<h1>Simple Calculator</h1>" + | |
| "<form action='/calculator' method='get'>" + | |
| "<input type='text' name='num1' value='" + num1 + "' />" + | |
| "<input type='text' name='op' value='" + op + "' />" + | |
| "<input type='text' name='num2' value='" + num2 + "' />" + | |
| "=" + | |
| "<input type='text' name='result' value='" + result + "' />" + | |
| "<input type='submit' value='Submit' />" + | |
| "</form>" + | |
| "</body>" + | |
| "</html>" | |
| ); | |
| } | |
| } |
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" | |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" | |
| version="4.0"> | |
| <display-name>Calculator</display-name> | |
| <welcome-file-list> | |
| <welcome-file>index.html</welcome-file> | |
| </welcome-file-list> | |
| <servlet> | |
| <servlet-name>calculator</servlet-name> | |
| <servlet-class>com.java.Calculator</servlet-class> | |
| </servlet> | |
| <servlet-mapping> | |
| <servlet-name>calculator</servlet-name> | |
| <url-pattern>/calculator</url-pattern> | |
| </servlet-mapping> | |
| </web-app> |
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