CalculationServlet.java：

package com.you.servlet;

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.you.model.Calculator;

/**
 * 
 * 类功能说明
 * 类修改者 修改日期
 * 修改说明
 * <p>Title:CalculationServlet.java</p>
 * <p>Description:游海东个人开发</p>
 * <p>Copyright:Copyright(c)2013</p>
 * @author:游海东
 * @date:2014-6-15 下午10:52:42
 * @version V1.0
 */
public class CalculationServlet extends HttpServlet 
{
	/**
	 * @Fields  serialVersionUID:序列化
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * Constructor of the object.
	 */
	public CalculationServlet() 
	{
		super();
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException 
	{
        this.doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException 
	{
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		//操作数一
		String operandOne=request.getParameter("operandOne");
		//操作数二
		String operandTwo=request.getParameter("setOperandTwo");
		//运算符
		String operator=request.getParameter("operator");
		//计算结果
		double calResult=0;
		
		Calculator cal=new Calculator();
		//将字符串转换成double
		cal.setOperandOne(Double.parseDouble(operandOne));
		cal.setOperandTwo(Double.parseDouble(operandTwo));
		
		//加法
		if(operator.equals("+"))
		{
			calResult=cal.addition();
		}
		//减法
		else if(operator.equals("-"))
		{
			calResult=cal.subtraction();
		}
		//乘法
		else if(operator.equals("*"))
		{
			calResult=cal.multiplication();
		}
		//除法
		else if(operator.equals("/"))
		{
			calResult=cal.division();
		}
		request.setAttribute("calResult", calResult);
		request.getRequestDispatcher("/resultServlet").forward(request, response);
		out.print(calResult);
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() 
	{
		super.destroy(); 
	}
	
	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException 
	{
		
	}

}