简单的JAVA MVC框架模式--Java-servlet-JavaBean

来源：互联网发布：数据只显示万位整数编辑：程序博客网时间：2024/06/05 04:08

MVC全名是Model View Controller，是模型(model)－视图(view)－控制器(controller)的缩写，一种软件设计典范，用一种业务逻辑、数据、界面显示分离的方法组织代码

此框架模式是一个简单的解决个人所得税计算的业务逻辑

servlet

import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;/** * Servlet implementation class TaxServlet */public class TaxServlet extends HttpServlet {private static final long serialVersionUID = 1L;/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse *      response) */protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {String income = request.getParameter("income");int n = Integer.parseInt(income);// 控制器调用业务模型// 模型 JavaBeanTax tax = new Tax();int result = tax.getResult(n);// 结果存入作用域HttpSession session = request.getSession();session.setAttribute("ic", result);// 跳转到 show.jspresponse.sendRedirect("show.jsp");}}

JavaBean

实现对数据的处理：个人所得税的计算

public class Tax {// 怎么计算个人所得税public int getResult(int n) {// 计算个人所得税int x = n - 3500;if (x <= 0) {return 0;}if (x <= 1500) {return (int) (x * 0.03f);} else if (x <= 4500) {return (int) (x * 0.1f - 105f);} else if (x <= 9000) {return (int) (x * 0.2f - 555f);} else if (x <= 35000) {return (int) (x * 0.25f - 1005f);} else if (x <= 55000) {return (int) (x * 0.3f - 2755f);} else if (x <= 80000) {return (int) (x * 0.35f - 5505f);} elsereturn (int) (x * 0.45f - 13505f);}}

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>个人所得税查询</title></head><body><h1>计算个人所得税</h1><form action="tax" method="post"><input type="text" name="income"><input type="submit" value="提交"></form></body></html>

show.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><span style="white-space:pre"></span><!-- 内置对象session接收数据   --><span style="white-space:pre"></span><%<span style="white-space:pre"></span>int n =( (Integer)session.getAttribute("ic")).intValue();<span style="white-space:pre"></span>%><span style="white-space:pre"></span><h1><%=n %></h1></body></html>

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