Java Mvc编程模式列子.doc

实验六 Mvc编程模式【实验目的】1、掌握jsp+JavaBean+Servlet开发模式2、掌握Mvc思想，会使用mvc开发简单的web应用。【实验内容:】1、开发mvc模式的登录模块或者注册模块，要求链接数据库2、以Mvc思想为指导，使用jsp+JavaBean+Servlet开发模式开发一个web版本的计算器3、开发mvc模式的用户满意度调查程序，调查结果要用图形显示、保存在数据库【参考代码：】1、 mvc模式的登录模块或者注册模块Jsp：loginUsername:Password:Servlet：public class LoginServlet extends HttpServlet private static final String CONTENT_TYPE = text/html; charset=GBK; /Initialize global variables public void init() throws ServletException /Process the HTTP Post request public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException response.setContentType(CONTENT_TYPE); PrintWriter out = response.getWriter(); String name = request.getParameter(username); String pass = request.getParameter(password); if (name != null & pass != null) User user = new User(); user.setUsername(name); user.setPassword(pass); if (user.check(user) HttpSession session=request.getSession(); session.setAttribute(user,user); RequestDispatcher dispatcher=request.getRequestDispatcher(welcome.jsp); dispatcher.forward(request,response) ; else RequestDispatcher dispatcher=request.getRequestDispatcher(fail.jsp); dispatcher.forward(request,response) ; else RequestDispatcher dispatcher=request.getRequestDispatcher(fail.jsp); dispatcher.forward(request,response) ; out.close(); /Clean up resources public void destroy() Javabean：public class User private String username; private String password; public User() public void setUsername(String username) this.username = username; public void setPassword(String password) this.password = password; public String getUsername() return username; public String getPassword() return password; public boolean check(User user) String name = user.getUsername(); String pass = user.getPassword(); String condition = select * from login where username= + name + ; Connection con = null; Statement sql = null; ResultSet rs = null; try Class.forName(sun.jdbc.odbc.JdbcOdbcDriver); catch (ClassNotFoundException e) try con = DriverManager.getConnection(jdbc:odbc:sun, , ); sql = con.createStatement(); rs = sql.executeQuery(condition); rs.next(); String t=rs.getString(3); if(t.equals(pass) return true; catch (SQLException ex) return false; return false; 2 Mvc的计算器Jsp:jsp1 输入两个数: * / + - result 运算结果： = 输入两个数: * / + - Servlet:public class Servlet1 extends HttpServlet private static final String CONTENT_TYPE = text/html; charset=GBK; /Initialize global variables public void init() throws ServletException /Process the HTTP Get request public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException response.setContentType(CONTENT_TYPE); try PrintWriter out = response.getWriter(); Calculate c = new Calculate(); String a1 = (String) request.getParameter(a); double a = Double.parseDouble(a1); c.setA(a); String a2 = (String) request.getParameter(b); double b = Double.parseDouble(a2); c.setB(b); String a3 = (String) request.getParameter(flag); int f = Integer.parseInt(a3); c.setFlag(f); c.jisuan(); HttpSession session=request.getSession(); session.setAttribute(ok,c); RequestDispatcher dis=request.getRequestDispatcher(/result.jsp); dis.forward(request,response); catch (Exception ex) ex.printStackTrace(); /Process the HTTP Post request public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException doGet(request, response); /Clean up resources public void destroy() javaBean:package calculate.model;public class Calculate private double a; private double b; private double r; private int flag; private String operator; public Calculate() public void setA(double a) this.a = a; public void setB(double b) this.b = b; public void setR(double r) this.r = r; public void setFlag(int flag) this.flag = flag; public double getA() return a; public double getB() return b; public double getR() return r; public int getFlag() return flag; public String getOperator() return operator; public void jisuan() switch (flag) case 1: r = a * b; operator=*; break; case 2: r = a / b; operator=/; break; case 3: r = a + b; operator=+; break; case 4: r = a - b; operator=-; break; 3 满意度调查Jsp： JSP Page Hello World! 好 较好 一般 差 JSP Page Hello World! 好 $requestScopepercent.good% 较好 $requestScopepercent.better% 一般$requestSmon% 差$requestScopepercent.bad% JavaBean：/* * To change this template, choose Tools | Templates * and open the template in the editor. */package jkx;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.logging.Level;import java.util.logging.Logger;/* * * author lswyy */public class Survey private int good; private int better ; private int common ; private int bad ; private int survey; private int totalSurvey; public int getSurvey() return survey; public void setSurvey(int survey) if (survey=4) setGood(1); else if (survey=3) setBetter(1); else if (survey=2) setCommon(1); else setBad(1); private HashMap width =new HashMap(); private HashMap percent =new HashMap(); public HashMap getPercent() return percent; public HashMap getWidth() return width; public int getBad() return bad; public void setBad(int bad) this.bad+= bad; public int getBetter() return better; public void setBetter(int better) this.better += better; public int getCommon() return common; public void setCommon(int common) mon += common; public int getGood() return good; public void setGood(int good) this.good += good; public void count() jisuan(good, good); jisuan(better, better); jisuan(common, common); jisuan(bad, bad); System.out.println(width:+width); System.out.println(percent:+percent); private void jisuan(int num,String key) int total=500;/柱状图片的最大宽度统一为500 float n=good+better+common+bad; totalSurvey=(int) n; percent.put(key, (int) (num / n*100); width.put(key, (int)(500*(num/n); /* * USE pubsGO/* 对象: Table dbo.surveySET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOCREATE TABLE dbo.survey(id int NOT NULL,good int NULL,better int NULL,common int NULL,bad int NULL,total int NULL, CONSTRAINT PK_survey PRIMARY KEY CLUSTERED(id ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON PRIMARY) ON PRIMARY */ DBConnection dbc=new DBConnection(); public void save() Connection connection =dbc.getConnection(); String sql =update survey set good=?, better=?, common=?, bad=?, total=? where id=1; try PreparedStatement ps = connection.prepareStatement(sql); ps.setInt(1, good); ps.setInt(2, better); ps.setInt(3, common); ps.setInt(4, bad); ps.setInt(5, totalSurvey); ps.executeUpdate(); catch (SQLException ex) Logger.getLogger(Survey.class.getName().log(Level.SEVERE, null, ex); Servlet：public class SurveyServlet extends HttpServlet /* * Processes requests for both HTTP GET and POST methods. * param request servlet request * param response servlet response * throws ServletException if a servlet-specific error occurs * throws IOException if an I/O error occurs */ Survey survey=new Survey();/所有用户的请求数据交到同一个JavaBean中计算结果 protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException try Map form =request.getParameterMap(); BeanUtils.populate(survey, form); survey.count(); survey.save(); request.setAttribute(width, survey.getWidth(); request.setAttribute(percent, survey.ge