2017.11.21 基于JSP+Servlet+JavaBean实现复数运算（二）

代码的实现

最基本的MVC模式

//input.jsp 输入界面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

   <title>提交数据页面</title>

  </head>

  <body>

    <form action="/servlet/CaculateServlet" method="post">

    	请输入第一个复数的实部：<input type="text" name="r1"/><br>

    	请输入第一个复数的虚部：<input type="text" name="i1"/><br>

    	选择运算类型：

    	<select name="oper">

    		<option>+</option>

    		<option>-</option>

    		<option>*</option>

    		<option>/</option>

    	</select><br><br>

    	请输入第二个复数的实部：<input type="text" name="r2"/><br>

    	请输入第二个复数的虚部：<input type="text" name="i2"/><br>

    	<input type="submit" value="计算"/>

    </form>

  </body>

</html>

//CaculateServlet servlet类

package servlets;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import beans.Complex;

public class CaculateServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public CaculateServlet() {

		super();

	}

	public void destroy() {

		super.destroy(); // Just puts "destroy" string in log

		// Put your code here

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		double r1=Double.parseDouble(request.getParameter("r1"));

		double i1=Double.parseDouble(request.getParameter("i1"));

		String oper=request.getParameter("oper");//接受单选下拉框

		double r2=Double.parseDouble(request.getParameter("r2"));

		double i2=Double.parseDouble(request.getParameter("i2"));

		String result="";

				Complex c1=new Complex(r1,i1);  //创建对象

				Complex c2=new Complex(r2,i2);

			if("+".equals(oper))

				result=c1.add(c2).info();

			else if("-".equals(oper))

				result=c1.sub(c2).info();

			else if("*".equals(oper))

				result=c1.mul(c2).info();

			else

				result=c1.div(c2).info();

			request.setAttribute("outputMassage", result); //保存输出结果到outMessage对象中

			request.getRequestDispatcher("/output.jsp").forward(request, response);

			//转向JSP页面

	}

	public void doGet(HttpServletRequest request,HttpServletResponse response)

		throws ServletException,IOException{

			doPost(request,response);

	}

}

//output.jsp 输出结果页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>显示结果页面</title>

  </head>

  <body>

    <%=request.getAttribute("outMeaasge") %>

  </body>

</html>

巴特西

2017.11.21 基于JSP+Servlet+JavaBean实现复数运算（二）

代码的实现

最基本的MVC模式

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