大数据正式20 朴灿烈づ我的快乐病毒、 2022-06-04 08:27 302阅读 0赞 # 大数据正式20 # ### JavaEE开发模式 ### * 为什么要有JavaEE开发模式 1. 之前的代码混在一起太乱 2. 项目越来越大，代码结构太差 3. 之前设计分层不清，不便于维护和扩展 4. 。。。。。 * 发展阶段一 * Servlet： * 本质上是java代码，所以非常便于处理逻辑，但是不擅长输出界面 * jsp： * 看起来像HTML，但是内部可以写java代码，是一种动态web资源开发技术，非常便于编写界面，嵌入的代码也可以用来处理部分逻辑。但是这样做的话，jsp又产生了大量的代码，又难以维护和扩展 * javaBean+jsp * 这种开发模式下，jsp负责接收请求、资源调度、展示页面，javaBean负责数据的封装、数据处理、数据的持久化等操作 * ![GPWVdPB.png][] * 这种模式不可避免的又在jsp里写java代码 * 发展阶段二 * Servlet+JavaBean+Jsp * Servlet：资源调度 * JavaBean：封装数据、处理数据、持久化数据 * Jsp：展示数据 * ![lDFrjsm.png][] * MVC设计思想： * M：Model，模型【封装数据、处理数据】 * V：View，视图【和用户交互】 * C：Controller，控制器【控制程序的流转】 * 尽量做到：这三个部分尽量相互独立，互不影响；这样可以让软件结构清晰，模块之间互不干扰，有利于软件的设计、开发和维护 * 发展阶段三 * 模块组装 * ![cvfp7G3.png][] * mvc架构 * ![R1E90UH.png][] * JavaEE经典的三层架构 * ![dV6Ce5A.png][] * 分层的目的： 1. 代码更加具有优良的结构，便于开发和调试 2. 便于层与层的代码复用，减少代码冗余 3. 在更改模块时可以不影响其他模块的使用，实现模块的复用 1. mysql->oracle【只需写个新的实现类】 2. web->android【service和dao层不需要修改】 * 三层独立：不要将特有的对象作为参数传给其它层，否则形成入侵，耦合度形成并变高，这种耦合是有害的，应该尽量避免，实现高内聚，低耦合 * 解耦的实现 1. 不要互换传递层特有的对象，尽量避免。 2. 但是再小心，层与层早晚要发生关系的，此时需要将耦合管理起来 1. Spring框架 2. 接口+配置文件+工厂模式 # # package com.easymall.factory; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.Properties; public class BasicFactory { private static BasicFactory factory = new BasicFactory(); private static Properties prop = null; static { prop = new Properties(); try { prop.load(new FileInputStream(new File(BasicFactory.class .getClassLoader().getResource("config.properties") .getPath()))); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private BasicFactory() { super(); } public static BasicFactory getFactory() { return factory; } @SuppressWarnings("unchecked") public <T> T getObj(Class<T> c) { System.out.println(prop); String name = prop.getProperty(c.getSimpleName()); System.out.println(name); Class<?> basic = null; Object obj = null; try { basic = Class.forName(name); obj = basic.newInstance(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return (T) obj; } } ### javaEE三层架构流程演示 ### * 注册逻辑 * ![66lix6m.png][] ### 软件分层换底层 ### * 可能影响的原因 * HttpServlet的传递，改换成Android就蒙圈了 * 各层之间的对象引用写死 * 只需改相应的层即可 * 详细看代码重构中的具体结构与相应的代码 ### EasyMall代码重构 ### * 之前的结构 * ![ktfBzbA.png][] * 重构之后的结构 * ![qntiQX2.png][] ### 重构具体代码 ### * com.easymall.dao * UserDao # # package com.easymall.dao; import com.easymall.domain.User; public interface UserDao { /** * 通过用户名查询数据库中是否有该数据记录 * * @param user * @return 是否存在该用户名对应的数据记录 */ public boolean findUserByUserName(User user); /** * 添加用户信息 * * @param user用户信息实体 * @return void */ public void addUser(User user); /** * 通过账号和密码来查询数据库是否有此账号 * * @param username * @param password * @return 返回通数据库是否有此账号和密码对应的记录 */ public boolean findUserByNameAndPass(String username, String password); } * UserDaoImpl # # package com.easymall.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import com.easymall.domain.User; import com.easymall.utils.MySqlUtils; public class UserDaoImpl implements UserDao { Connection conn = null; PreparedStatement stat = null; ResultSet rs = null; public boolean findUserByUserName(User user) { try { conn = MySqlUtils.getConn(); stat = conn.prepareStatement("select * from user where username=?"); stat.setString(1, user.getUsername()); rs = stat.executeQuery(); return rs.next(); } catch (SQLException e) { return false; } finally { MySqlUtils.close(conn, stat, rs); } } public void addUser(User user) { conn = MySqlUtils.getConn(); try { stat = conn.prepareStatement("insert into user values(?,?,?,?)"); stat.setString(1, user.getUsername()); stat.setString(2, user.getPassword()); stat.setString(3, user.getNickname()); stat.setString(4, user.getEmail()); stat.executeUpdate(); } catch (SQLException e) { e.printStackTrace(); } finally { MySqlUtils.close(conn, stat, rs); } } public boolean findUserByNameAndPass(String username, String password) { conn = MySqlUtils.getConn(); try { stat = conn .prepareStatement("select * from user where username=? and password=?"); stat.setString(1, username); stat.setString(2, password); rs = stat.executeQuery(); return rs.next(); } catch (SQLException e) { return false; } finally { MySqlUtils.close(conn, stat, rs); } } } * com.easymall.domain * User # # package com.easymall.domain; /** * 注册用户 * * @author Administrator * */ public class User { private int id; private String username; private String password; private String nickname; private String email; public User() { super(); } public User(int id, String username, String password, String nickname, String email) { super(); this.id = id; this.username = username; this.password = password; this.nickname = nickname; this.email = email; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getNickname() { return nickname; } public void setNickname(String nickname) { this.nickname = nickname; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } } * com.easymall.exception * MsgException # # package com.easymall.exception; @SuppressWarnings("serial") public class MsgException extends RuntimeException { public MsgException() { } public MsgException(String msg) { super(msg); } } * com.easymall.factory * BasicFactory # # package com.easymall.factory; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.Properties; public class BasicFactory { private static BasicFactory factory = new BasicFactory(); private static Properties prop = null; static { prop = new Properties(); try { prop.load(new FileInputStream(new File(BasicFactory.class .getClassLoader().getResource("config.properties") .getPath()))); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private BasicFactory() { super(); } public static BasicFactory getFactory() { return factory; } @SuppressWarnings("unchecked") public <T> T getObj(Class<T> c) { System.out.println(prop); String name = prop.getProperty(c.getSimpleName()); System.out.println(name); Class<?> basic = null; Object obj = null; try { basic = Class.forName(name); obj = basic.newInstance(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return (T) obj; } } * com.easymall.service * UserService # # package com.easymall.service; import com.easymall.domain.User; import com.easymall.exception.MsgException; public interface UserService { /** * 注册用户 * * @param user封装了要注册用户的数据 * @throws 注册中用户信息有误则抛出异常 */ void regist(User user) throws MsgException; /** * 查询账号是否重复 * * @param 用户实体 * @return 返回数据库中是否有此用户名 */ boolean checkHasUsername(User user); /** * * 检查用户名和密码 * * @param username * @param password * @return 返回是否存在该账户和密码 */ boolean checkUsernameAndPassord(String username, String password); /** * 添加一名用户 * * @param user * @return void */ void addUser(User user); } * UserServiceImpl # # package com.easymall.service; import com.easymall.dao.UserDao; import com.easymall.domain.User; import com.easymall.exception.MsgException; import com.easymall.factory.BasicFactory; public class UserServiceImpl implements UserService { UserDao ud = BasicFactory.getFactory().getObj(UserDao.class); public void regist(User user) throws MsgException { boolean hasUser = ud.findUserByUserName(user); // 如果用户名重复则抛出异常 if (hasUser) { throw new MsgException("该账号已经存在！"); } else { // 如果用户名不重复则向数据库写入信息 ud.addUser(user); } } public boolean checkHasUsername(User user) { // 找到返回true，找不到返回false return ud.findUserByUserName(user); } public boolean checkUsernameAndPassord(String username, String password) { return ud.findUserByNameAndPass(username, password); } public void addUser(User user) { ud.addUser(user); } } * com.easymall.utils * MySqlUtils # # package com.easymall.utils; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import com.mchange.v2.c3p0.ComboPooledDataSource; public class MySqlUtils { // 创建数据库连接池--数据连接池只允许有一个 private static ComboPooledDataSource cpds = new ComboPooledDataSource(); // 将构造函数私有化，不允许创建该实例 private MySqlUtils() { super(); } // 获取连接 public static Connection getConn() { Connection conn = null; try { conn = cpds.getConnection(); } catch (SQLException e) { // 没有获得数据库连接的异常处理[有待详细处理] throw new RuntimeException(e); } return conn; } // 关闭资源 public static void close(Connection conn, Statement stat, ResultSet rs) { if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } finally { conn = null; } } if (stat != null) { try { stat.close(); } catch (SQLException e) { e.printStackTrace(); } finally { stat = null; } } if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } finally { rs = null; } } } } * com.easymall.web * CheckHasUsernameServlet # # package com.easymall.web; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.easymall.domain.User; import com.easymall.factory.BasicFactory; import com.easymall.service.UserService; @SuppressWarnings("serial") public class CheckHasUsernameServlet extends HttpServlet { private boolean hasUser = false; UserService userService = BasicFactory.getFactory().getObj( UserService.class); protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { try { // 获取用户名并解决乱码 String username = new String(req.getParameter("username").getBytes( "iso8859-1"), "utf-8"); // 查询数据库中是否有此用户 User user = new User(-1, username, null, null, null); hasUser = userService.checkHasUsername(user); } catch (Exception e) { throw new RuntimeException(e); } // 返回json格式的数据 System.out.println(hasUser); resp.getWriter().write("{\"hasUser\":" + hasUser + "}"); } protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } } * LoginServlet # # package com.easymall.web; import java.io.IOException; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.easymall.factory.BasicFactory; import com.easymall.service.UserService; @SuppressWarnings("serial") public class LoginServlet extends HttpServlet { // 处理逻辑 UserService us = BasicFactory.getFactory().getObj( UserService.class); public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 解决乱码 request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); // 获取用户名和密码 String username = request.getParameter("username") == null ? "" : request.getParameter("username"); String password = request.getParameter("password") == null ? "" : request.getParameter("password"); // 处理记住用户名的逻辑 if ("true".equals(request.getParameter("remname"))) { System.out.println("sdfg"); Cookie cookie = new Cookie("remname", URLEncoder.encode(username, "utf-8")); cookie.setMaxAge(60 * 60 * 24 * 30); cookie.setPath(request.getContextPath()); response.addCookie(cookie); } else {// 不保存--删除Cookie Cookie cookie = new Cookie("remname", ""); cookie.setMaxAge(0); cookie.setPath(request.getContextPath()); response.addCookie(cookie); } // 检查用户名和密码 if (us.checkUsernameAndPassord(username, password)) { // 获取session HttpSession session = request.getSession(); // 在session中加入相应的标记 session.setAttribute("username", username); // 回到主页 response.getWriter().write("登录成功！正在跳转。。。"); response.setHeader("refresh", "2;url=" + request.getContextPath() + "/index.jsp"); } else { response.addHeader("refresh", "0;url=" + request.getContextPath() + "/login.jsp?msg=" + URLEncoder.encode("账号密码错误！", "utf-8")); } } } * LogOutServlet # # package com.easymall.web; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class LogOutServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 解决乱码 response.setCharacterEncoding("utf-8"); response.setContentType("text/html;charst=utf-8"); // 杀死session--先进行判断用户是否有session--防止恶意攻击 if (request.getSession(false) != null) { request.getSession(false).invalidate(); } // 回到主页 // 注销中。。。 response.getWriter().write("注销成功！正在跳转到主页。。。"); response.setHeader("refresh", "2;url=" + request.getContextPath() + "/index.jsp"); } } * RegistServlet # # package com.easymall.web; import java.io.IOException; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.easymall.domain.User; import com.easymall.exception.MsgException; import com.easymall.factory.BasicFactory; import com.easymall.service.UserService; @SuppressWarnings("serial") public class RegistServlet extends HttpServlet { UserService us = BasicFactory.getFactory().getObj(UserService.class); public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { // 0.获取应用参数 ServletContext sc = this.getServletContext(); String encode = sc.getInitParameter("encode"); // 1.解决requestpost请求乱码 解决response输出数据乱码 request.setCharacterEncoding(encode); response.setCharacterEncoding(encode); response.setContentType("text/html;charset=" + encode); // 2.获取请求参数 String username = request.getParameter("username"); String password = request.getParameter("password"); String password2 = request.getParameter("password2"); String nickname = request.getParameter("nickname"); String email = request.getParameter("email"); String valistr = request.getParameter("valistr"); // 验证码校验--获取请求参数的验证码，获取session中的验证码，对比并进行相应的操作 String valistr2 = (String) request.getSession().getAttribute( "valistr2"); if (valistr == null || valistr2 == null || !valistr.equals(valistr2)) { request.setAttribute("msg", "验证码不正确！"); request.getRequestDispatcher( request.getContextPath() + "/regist.jsp").forward( request, response); return; } // 3.检查数据有效性 如果有问题 向浏览器报错 if (username == null || "".equals(username)) { throw new MsgException("用户名不能为空！"); } if (password == null || "".equals(password)) { throw new MsgException("密码不能为空！"); } if (password2 == null || "".equals(password2)) { throw new MsgException("确认密码不能为空！"); } if (!password.equals(password2)) { throw new MsgException("两次密码不一致！"); } if (nickname == null || "".equals(nickname)) { throw new MsgException("昵称不能为空！"); } if (email == null || "".equals(email)) { throw new MsgException("邮箱不能为空！"); } if (!email.matches("^\\w+@\\w+(\\.\\w+)+$")) { throw new MsgException("邮箱格式不正确！"); } if (valistr == null || "".equals(valistr)) { throw new MsgException("验证码不能为空！"); } // 4.存入数据库 User user = new User(-1, username, password, nickname, email); if (us.checkHasUsername(user)) {// 账号重复 throw new MsgException("账号重复"); } else {// 账号不重复 // 存储数据 us.addUser(user); } // 5.向浏览器报告成功 回到主页 response.getWriter().write("注册成功！正在前往主页------>>>"); response.setHeader("refresh", "1;url=" + request.getContextPath() + "/index.jsp"); } catch (MsgException e) { String msg = e.getMessage(); response.getWriter().write(msg); response.setHeader("refresh", "1;url=/regist.jsp"); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(e); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } } * ValiImageServlet.java # # package com.easymall.web; import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class ValiImageServlet extends HttpServlet { // 背景参数 private int base = 30; private int height = base; private int width = base * 4; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 禁止浏览器缓存图片 resp.setHeader("Cache-Control", "no-cache"); resp.setHeader("Progma", "no-cache"); resp.setDateHeader("Expires", 0); // 创建内存中的图片 BufferedImage di = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 获取画布画背景 Graphics2D g2 = (Graphics2D) di.getGraphics(); // 填充矩形 g2.setColor(Color.white); g2.fillRect(0, 0, width, height); // 绘制边框 g2.setColor(Color.red); g2.drawRect(0, 0, width - 1, height - 1); // 写字并保存到session String valistr2 = ""; g2.setFont(new Font("微软雅黑", Font.BOLD, 25)); for (int i = 0; i < 4; i++) { String s = Integer.toString(getRandom(0, 10)); valistr2 += s; g2.setColor(new Color(getRandom(0, 255), getRandom(0, 255), getRandom(0, 255))); int temp = getRandom(-45, 45); g2.rotate(temp / 180.0 * Math.PI, 10 + 30 * i, 20); g2.drawString(s, 10 + 30 * i, 20); g2.rotate(-temp / 180.0 * Math.PI, 10 + 30 * i, 20); } System.out.println("当前验证码：" + valistr2); req.getSession().setAttribute("valistr2", valistr2); // 画干扰线 for (int i = 0; i < 3; i++) { g2.setColor(new Color(getRandom(0, 255), getRandom(0, 255), getRandom(0, 255))); g2.drawLine(getRandom(0, width), getRandom(0, height), getRandom(0, width), getRandom(0, height)); } // 画干扰点 for (int i = 0; i < 5; i++) { g2.setColor(new Color(getRandom(0, 255), getRandom(0, 255), getRandom(0, 255))); g2.drawOval(getRandom(0, width), getRandom(0, height), 5, 5); } // 画出图片 ImageIO.write(di, "JPG", resp.getOutputStream()); // 关闭画布 g2.dispose(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doGet(req, resp); } // 获取随机数 private int getRandom(int start, int end) { Random random = new Random(); return start + random.nextInt(end - start); } } * 配置文件 * c3p0.properties # # c3p0.driverClass=com.mysql.jdbc.Driver c3p0.jdbcUrl=jdbc:mysql://localhost:3306/easymall c3p0.user=root c3p0.password=root * config.properties # # UserService=com.easymall.service.UserServiceImpl UserDao=com.easymall.dao.UserDaoImpl * web.xml # # <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <!-- 全局参数的设置 --> <context-param> <param-name>encode</param-name> <param-value>utf-8</param-value> </context-param> <!-- Servlet地址对应设置 --> <servlet> <servlet-name>RegistServlet</servlet-name> <servlet-class>com.easymall.web.RegistServlet</servlet-class> </servlet> <servlet> <servlet-name>CheckHasUsernameServlet</servlet-name> <servlet-class>com.easymall.web.CheckHasUsernameServlet</servlet-class> </servlet> <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.easymall.web.LoginServlet</servlet-class> </servlet> <servlet> <servlet-name>LogOutServlet</servlet-name> <servlet-class>com.easymall.web.LogOutServlet</servlet-class> </servlet> <servlet> <servlet-name>ValiImageServlet</servlet-name> <servlet-class>com.easymall.web.ValiImageServlet</servlet-class> </servlet> <!-- Servlet映射设置 --> <servlet-mapping> <servlet-name>RegistServlet</servlet-name> <url-pattern>/RegistServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>CheckHasUsernameServlet</servlet-name> <url-pattern>/CheckHasUsernameServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/LoginServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>LogOutServlet</servlet-name> <url-pattern>/LogOutServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>ValiImageServlet</servlet-name> <url-pattern>/ValiImageServlet</url-pattern> </servlet-mapping> <!-- 欢迎页面 --> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> * jsp页面（主要看EL+jstl;样式这里省略） * foot.jsp # # <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" href="css/foot.css" /> <div id="common_foot"> <p> Copyright © 2011-2015 达内软件技术有限公司 版权所有 保留一切权利 苏B2-20130048号 | 京ICP备09062682号-9 <br> 网络文化经营许可证苏网文[2012]0401-019号 </p> </div> * head.jsp # # <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML> <link rel="stylesheet" href="css/head.css" /> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> <div id="common_head"> <div id="line1"> <div id="content"> <c:if test="${sessionScope.username!=null}"> 您好：${sessionScope.username} | <a href="${requestScope.contextPath }/LogOutServlet">注销 </a> </c:if> <c:if test="${sessionScope.username==null}"> <a href="${requestScope.contextPath }/login.jsp">登录</a> | <a href="${requestScope.contextPath }/regist.jsp">注册</a> </c:if> </div> </div> <div id="line2"> <img id="logo" src="img/head/logo.jpg" /> <input type="text" name="" /> <input type="button" value="搜索" /> <span id="goto"> <a id="goto_order" href="#">我的订单</a> <a id="goto_cart" href="#">我的购物车</a> </span> <img id="erwm" src="img/head/qr.jpg" /> </div> <div id="line3"> <div id="content"> <ul> <li><a href="#">首页</a> </li> <li><a href="#">全部商品</a> </li> <li><a href="#">手机数码</a> </li> <li><a href="#">电脑平板</a> </li> <li><a href="#">家用电器</a> </li> <li><a href="#">汽车用品</a> </li> <li><a href="#">食品饮料</a> </li> <li><a href="#">图书杂志</a> </li> <li><a href="#">服装服饰</a> </li> <li><a href="#">理财产品</a> </li> </ul> </div> </div> </div> * index.jsp # # <%@ page language="java" import="java.util.*" pageEncoding="UTF-8" buffer="0kb"%> <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" href="css/index.css" /> <title>欢迎光临EasyMall</title> </head> <body> <%@include file="head.jsp"%> <div id="index"> <div id="line1"> <img src="img/index/banner_big.jpg" /> </div> <div id="line2"> <img id="line2_1" src="img/index/adv1.jpg" /> <img id="line2_2" src="img/index/adv2.jpg" /> <img id="line2_3" src="img/index/adv_l1.jpg" /> </div> <div id="line3"> <img id="line3_1" src="img/index/adv3.jpg" /> <img id="line3_2" src="img/index/adv4.jpg" /> <div id="line3_right"> <img id="line3_3" src="img/index/adv_l2.jpg" /> <img id="line3_4" src="img/index/adv_l3.jpg" /> </div> </div> <div id="line4"> <img src="img/index/217.jpg" /> </div> <div id="line5"> <span id="line5_1"> <img src="img/index/icon_g1.png" /> 500强企业 品质保证 </span> <span id="line5_2"> <img src="img/index/icon_g2.png" /> 7天退货 15天换货 </span> <span id="line5_3"> <img src="img/index/icon_g3.png" /> 100元起免运费 </span> <span id="line5_4"> <img src="img/index/icon_g4.png" /> 448家维修网点 全国联保 </span> </div> </div> <%@include file="foot.jsp"%> </body> </html> * login.jsp # # <%@page import="java.net.URLDecoder"%> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" href="css/login.css" /> <title>EasyMall欢迎您登陆</title> </head> <body> <h1>欢迎登陆EasyMall</h1> <form action="/LoginServlet" method="POST"> <table> <c:if test="${param.msg!=null}"> <tr> <td colspan='2'><font color='#ff0000'> <!-- 注：这里没有解决乱码的jstl标签，所以用java代码来写--><%=new String(request.getParameter("msg").getBytes( "iso8859-1"), "utf-8")%> </font> </td> </tr> </c:if> <tr> <td class="tdx">用户名:</td> <td><input type="text" name="username" id="username" value="${cookie.remname.value}" /> </td> </tr> <tr> <td class="tdx">密码:</td> <td><input type="password" name="password" /></td> </tr> <tr> <td colspan="2"><input type="checkbox" name="remname" value="true" <c:if test="${cookie.remname!=null }">checked="checked"</c:if> />记住用户名 <input type="checkbox" name="autologin" value="true" />30天内自动登陆</td> </tr> <tr> <td colspan="2"><input type="submit" value="登陆" /> </td> </tr> </table> </form> <script type="text/javascript"> //给账号设值 var username = "${cookie.remname.value}"; document.getElementById("username").value = decodeURIComponent(username); </script> </body> </html> * regist.jsp # # <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML> <html> <head> <title>欢迎注册EasyMall</title> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" href="css/regist.css" /> <script type="text/javascript" src="js/jquery-1.4.2.js"></script> <script type="text/javascript"> $(document).ready( function() { var canSubmit = true;//提交的标志 //用户名已存在检查（ajax） $("input[name='username']").blur( function() { if ($("input[name='username']").val() != "") { $.get("/CheckHasUsernameServlet?" + $.param({ "username" : $( "input[name='username']") .val() }), function(data) { if ($.parseJSON(data).hasUser) { //提示该账户已有 $("input[name='username']") .next("span").text("用户名重复!"); canSubmit = false; } else { $("input[name='username']") .next("span").text(""); canSubmit = true; } }); } }); //两次密码的一致性检验(失去焦点) $("input[name='password2']").blur( function() { if ($("input[name='password2']").val() != "") { if ($("input[name='password']").val() != $( "input[name='password2']").val()) {//密码不一致 $("input[name='password2']").next("span") .text("密码不一致!"); canSubmit = false; } else { $("input[name='password2']").next("span") .text(""); canSubmit = true; } } }); //检查邮箱的格式是否正确 $("input[name='email']").blur(function() { var email_Reg = /^\w+@\w+(\.\w+)+$/; if ($(this).val() != "" && email_Reg.test($(this).val())) { $(this).next("span").text(""); canSubmit = true; } else { $(this).next("span").text("邮箱格式不正确！"); canSubmit = false; } }); //验证码切换（点击事件） $("#yzm_img").click( function() { $(this).attr( "src", "/ValiImageServlet?time=" + new Date().getTime()); }); //表单提交事件 $("form").submit(function() { //判断所有的输入框是否为空 $.each($("input[type!='submit']"), function() { if ($(this).val() == "") {//密码不一致 $(this).nextAll("span").text("数据不能为空！"); canSubmit = false; } else { $(this).nextAll("span").text(""); canSubmit = true; } }); return canSubmit; }); }); </script> </head> <body> <h1>欢迎注册EasyMall</h1> <form action="/RegistServlet" method="POST" onsubmit=""> <table> <tr> <td class="tds">用户名：</td> <td><input type="text" name="username" value="${param.username }"><span></span></td> </tr> <tr> <td class="tds">密码：</td> <td><input type="password" name="password"><span></span> </td> </tr> <tr> <td class="tds">确认密码：</td> <td><input type="password" name="password2"><span></span> </td> </tr> <tr> <td class="tds">昵称：</td> <td><input type="text" name="nickname" value="${param.nickname }"><span></span></td> </tr> <tr> <td class="tds">邮箱：</td> <td><input type="text" name="email" value="${param.email }"><span></span> </td> </tr> <tr> <td class="tds">验证码：</td> <td><input type="text" name="valistr"><img id="yzm_img" src="/ValiImageServlet" style="cursor: pointer" /><span><font color="#ff0000">${requestScope.msg }</font> </span> </td> </tr> <tr> <td colspan="2"><input type="submit" value="注册用户" /></td> </tr> </table> </form> </body> </html> * 所需jar包 * ![7w1tOyf.png][] [GPWVdPB.png]: https://i.imgur.com/GPWVdPB.png [lDFrjsm.png]: https://i.imgur.com/lDFrjsm.png [cvfp7G3.png]: https://i.imgur.com/cvfp7G3.png [R1E90UH.png]: https://i.imgur.com/R1E90UH.png [dV6Ce5A.png]: https://i.imgur.com/dV6Ce5A.png [66lix6m.png]: https://i.imgur.com/66lix6m.png [ktfBzbA.png]: https://i.imgur.com/ktfBzbA.png [qntiQX2.png]: https://i.imgur.com/qntiQX2.png [7w1tOyf.png]: https://i.imgur.com/7w1tOyf.png
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