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  • 制作简易计算器处理过程Servlet

    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
     * 类改动者 改动日期
     * 改动说明
     * <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 
    	{
    		
    	}
    
    }
    


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  • 原文地址:https://www.cnblogs.com/hrhguanli/p/4550192.html
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