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copied!<p>Generally you should abstract your business logic from Servlet container details. You can mock ServletRequest using <a href="http://static.springsource.org/spring/docs/2.0.x/api/org/springframework/mock/web/MockHttpServletRequest.html" rel="nofollow">Spring test package</a>, but it would be a bad idea to simulate Servlet container. So, you should either run system tests on a real container or move your logic from servlet into a separate bean and test it in isolation.</p> <pre><code> public class Calculator { public Integer calculate(Integer left, Integer right, String op) { Integer result = 0; if ("add".equals(op)) result = this.opAdd(left, right); if ("subtract".equals(op)) result = this.opSub(left, right); if ("multiply".equals(op)) result = this.opMul(left, right); if ("power".equals(op)) result = this.opPow(left, right); if ("divide".equals(op)) result = this.opDiv(left, right); if ("modulo".equals(op)) result = this.opMod(left, right); return result; } } public class CalculatorServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Integer left = Integer.valueOf(request.getParameter("left")); Integer right = Integer.valueOf(request.getParameter("right")); String op = request.getParameter("operator"); Integer result = calculator.calculate(left, right, op); request.setAttribute("result", result); // It'll be available as ${sum}. request.getRequestDispatcher("index.jsp").forward(request, response); } } </code></pre>

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