项目总结、收获和自我感觉
- 项目主要分为两个部分：用户，商家（管理员）
- 遗憾：
- 点赞和签到功能写的粗糙，没有较强的可行性
- 没有实现购物车和订单功能，项目的页面做的也不是特别好。
- 运用的体系知识
关键字：implement,extends,private等
异常处理：try{...｝catch(Exception e){...｝
基础语法：遍历，循环，正则表达式，javaweb的基础
重点（自认为)：通过form表单，实现与servlet的连接，servlet方法实现
<form action="LoginServlet?method=login" method="post"></form>
action出错/漏写 method="post"都会造成报错- 开始写项目时，所学的知识点比较零碎，借鉴其他项目，jsp、servlet、impl等部分混在一起，一头雾水，随着不断修改和项目的多次删除和重写，渐渐理解了其中的思路和规律。
- 一路踉踉仓仓做出来的东西确实不是当初想的那么美好，很多东西没有实现。无论怎么说还是有一个东西出来了，也算是这十几天的结晶，还是得到了很多有意义的经验，相信以后我会做的更好，达到想要到项目需求。
项目主要功能：
1.登录，注册
2. 用户 商家
项目分层：
项目代码
1.首页：
body{
/**
引入背景图片，设置尺寸
*/
background: url(img/eat.gif);
background-size: 800px 900px;
}
span{
/*文本居中
*/
text-align: center;
font-size: 30px;
}
<body>
<span><h1 >吃货联盟</h1></span>
<a href="user/login.jsp"><h2>登录</h2></a>
<a href="user/regist.jsp"><h2>注册</h2></a>
<a href="user/re.jsp"><h3>用户使用</h3></a>
<a href="manager/ch.jsp"><h3>商家后台管理</h3></a>
<br/>
<form action="<%=request.getContextPath()%>/logoutServlet" method = "post">
<input type="submit" value="退出系统"/>
</form>
<br/>
</body>2.用户
User
private int id;
private String name;
private String pwd;
private String sex;
private String home;
private String tel;public class UserDaoimpl extends BaseDao<User> implements UserDao{
@Override
public User getUserByUserNameAndPassword(User user) {
String sql="select * from user where name=? and pwd=?";
User bean=this.getBean(sql, user.getName(),user.getPwd());
return bean;
}
@Override
public boolean registUser(User user) {
String sql="insert into user(name,pwd) values(?,?)";
//update>0成功
int update=this.update(sql, user.getName(),user.getPwd());
return update>0;
}
@Override
public User getUserByUserName(User user) {
String sql="select * from user where username=?";
return getBean(sql,user.getName());
}
}public class UserServiceImpl implements UserService {
private UserDao ud=new UserDaoimpl();
@Override
public User login(User user) {
return ud.getUserByUserNameAndPassword(user);
}
@Override
public boolean regist(User user) {
return ud.registUser(user);
}
@Override
public boolean checkUser(User user) {
User byUserName=ud.getUserByUserName(user);
return byUserName==null;
}
}3.菜品
Dish
private int id;
private String name;
private double price;
private int sales;//销量public class DishDaoImpl extends BaseDao<Dish> implements DishDao{
@Override
public List<Dish> getAllDishs() {
String sql="select id,name,price,sales from dish";
//返回所有的图书
return getBeanList(sql);
}
@Override
public boolean addDish(Dish dish) {
// TODO Auto-generated method stub
String sql="insert into dish(id,name,price,sales) values(?,?,?,?)";
int update=update(sql,dish.getId(),dish.getName(),dish.getPrice(),dish.getSales());
//影响了多少行
return update>0;
}
@Override
public boolean delDish(Dish dish) {
String sql="delete from dish where id=?";
int update =update(sql, dish.getId());
return update>0;
}
@Override
public boolean updateDish(Dish dish) {
String sql="update dish set name=?,price=?,sales=? where id=?";
int update=update(sql,dish.getName(),dish.getPrice(),dish.getSales(),dish.getId());
//影响了多少行
return update>0;
}
@Override
public Dish getDish(Dish dish) {
String sql="select id,name,price,sales from dish where id=?";
return getBean(sql,dish.getId());
// return getBean(sql,dish.getId());)
}
@Override
public int getTotalCount() {
String sql="select count(*) from dish";
Object object=getSingleValue(sql);
int parseInt=0;
try {
parseInt=Integer.parseInt(object.toString());
} catch (NumberFormatException e) {
e.printStackTrace();
}
//)
return parseInt;
}
@Override
public int getTotalCountByPrice(double minPrice, double maxPrice) {
String sql="select count(*) from dish where price between ? and ?";
Object object=getSingleValue(sql, minPrice,maxPrice);
int i=0;
try {
i=Integer.parseInt(object.toString());
} catch (NumberFormatException e) {
e.printStackTrace();
}
return i;
}
@Override
public List<Dish> getPageByPrice(int index, int size, double minPrice, double maxPrice) {
String sql="select id,name,price,sales from dish between ? and ? limit ?,?";
return getBeanList(sql,minPrice,maxPrice,index,size);
}
}4.登录
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
body{
background: url(../img/login.gif);
background-size: 1200px 700px;
}
h3{
color:teal;
}
</style>
</head>
<body>
<h3>${msg }</h3>
<form name="form1" action="LoginServlet?method=login" method="post">
<table width="200" border="3">
<tr>
<td colspan="2"><h1>欢迎登录</h1></td>
</tr>
<tr>
<td>用户名</td>
<td><input type="text" name="username" size="10"></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password" size="10"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="登录"> <a
href="regist.jsp">注册新用户</a></td>
</tr>
</table>
</form>
</body>
</html>LoginServlet
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import impl.UserServiceImpl;
import user.User;
import user.UserService;
@WebServlet("/LoginServlet")
public class LoginServlet extends BaseServlet {
private static final long serialVersionUID = 1L;
private UserService us=new UserServiceImpl();
protected void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username=request.getParameter("username");
String password=request.getParameter("password");
User user=us.login(new User(0, username, password, null, null,null));
if(user==null) {
//登陆失败 返回登陆页面 转发
request.setAttribute("msg", "用户名密码错误");;
request.getRequestDispatcher("/user/login.jsp").forward(request, response);
}else {
//登陆成功 返回成功页面 重定向
response.sendRedirect(request.getContextPath()+"/user/login_success.jsp");
}
}
}5.注册
regist.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
.form{
height: 420px;
margin-top: 25px;
margin: 25px auto 0;
display: flex;
justify-content: center;
align-items: center;
}
span{
/*文本居中
*/
text-align: center;
font-size: 30px;
}
body{
background: url(../img/er2.gif);
background-size: 1200px 700px;
}
.errorMsg{
color: red;
}
</style>
<script src="../script/jquery-1.12.4.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
$("#sub_tn").click(function(){
// 验证用户名：必须由字母，数字下划线组成，并且长度为5到12位
//1 获取用户名输入框里的内容
var usernameText = $("#username").val();
//2 创建正则表达式对象
var usernamePatt = /^\w{5,12}$/;
//3 使用test方法验证
if (!usernamePatt.test(usernameText)) {
//4 提示用户结果
$("span.errorMsg").text("用户名不合法！");
return false;
}
// 验证密码：必须由字母，数字下划线组成，并且长度为5到12位
//1 获取用户名输入框里的内容
var passwordText = $("#password").val();
//2 创建正则表达式对象
var passwordPatt = /^\w{5,12}$/;
//3 使用test方法验证
if (!passwordPatt.test(passwordText)) {
//4 提示用户结果
$("span.errorMsg").text("密码不合法！");
return false;
}
// 验证确认密码：和密码相同
//1 获取确认密码内容
var repwdText = $("#repwd").val();
//2 和密码相比较
if (repwdText != passwordText) {
//3 提示用户
$("span.errorMsg").text("确认的密码和密码不一致！");
return false;
}
//验证手机号是否正确
var telText=$("#tel").val();
var telPatt = /^(86)?((13\d{9})|(15[0,1,2,3,5,6,7,8,9]\d{8})|(18[0,5,6,7,8,9]\d{8}))$/;
if(!telPatt.test(telText)){
$("span.errorMsg").text("手机号码格式错误！");
return false;
}
// 验证码：现在只需要验证用户已输入。因为还没讲到服务器。验证码生成。
var codeText = $("#code").val();
//去掉验证码前后空格
// alert("去空格前：["+codeText+"]")
codeText = $.trim(codeText);
// alert("去空格后：["+codeText+"]")
if (codeText == null || codeText == "") {
//4 提示用户
$("span.errorMsg").text("验证码不能为空！");
return false;
}
// 去掉错误信息
$("span.errorMsg").text("");
})
})
</script>
</head>
<body>
<div>
<div id="l_content">
<span class="login_word"><h1>欢迎注册</h1></span>
<span class="errorMsg" >
<h3>${msg==null?"请输入用户名":msg}</h3>
</span>
</div>
<div class="form">
<form action="RegistServlet?method=regist" method="post">
用户名称：
<input name="username" type="text" id="username" placeholder="请输入用户名">(由字母，数字下划线组成，并且长度为5到12位)<br/>
<br/>
用户密码：
<input name="password" type="password" id="password" placeholder="请输入密码">(由字母，数字下划线组成，并且长度为5到12位)<br/>
<br/>
确认密码：
<input name="repwd" type="password" id="repwd" placeholder="请再次输入密码"><br/>
<br/>
选择性别：
<input id="man" type="radio" name="sex" value="男" checked>男
<input type="radio" id="women"name="sex" value="女" checked>女<br/>
<br/>
<label>用户地址：</label>
<textarea rows="1" cols="17" placeholder="请输入地址"></textarea>
<br/>
<br/>
电话号码：
<input name="tel" rows="1" cols="10" id="tel" placeholder="请输入电话号码"/>
<br/>
<br/>
<td>
<tr><label> 验证码： </label></tr>
<tr><input type="text" name="code" id="code" style="width:90px;height: 35px " placeholder="请输入验证码"/> </tr>
<tr><img alt="" src="../img/code.bmp" style=" width:100px;height:40px;position: absolute" id="codeImg"></tr>
</td>
<br/>
<br/>
<input id="sub_tn" type="submit" value="注册" style="width: 60px;height: 30px">
<input id="reset" type="reset" value="重置" style="width: 60px;height: 30px">
</form>
</div>
</div>
</body>
</html>RegistServlet
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import impl.UserServiceImpl;
import user.User;
import user.UserService;
@WebServlet("/RegistServlet")
public class RegistServlet extends BaseServlet {
private static final long serialVersionUID = 1L;
private UserService us=new UserServiceImpl();
protected void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username=request.getParameter("username");
String password=request.getParameter("password");
boolean b=us.regist(new User(0, username, password,null, null, null));
if(b) {
//注册成功 返回成功页面 重定向
response.sendRedirect(request.getContextPath()+"/user/regist_success.jsp");
}else {
//注册失败 返回注册页面 转发
request.setAttribute("msg", "该用户已存在");
request.getRequestDispatcher("/user/regist.jsp").forward(request, response);
}
}
}6.filter
使用filter在进行操作时进行拦截，只有登录才能进行一系列操作
public class LoginFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.println("filter已经启动");
//验证用户是否登录，如果登录，放行，否则转到登陆页面
HttpServletRequest req=(HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse)response;
/*String urlString=req.getRequestURI();
if(urlString.endsWith("login.jsp")||urlString.endsWith("LoginServlet")) {
chain.doFilter(request, response);
return;
}*/
//获取已经登陆的用户
User user=Webutils.getLoginUser(req);
if(user==null) {
request.setAttribute("msg", "此操作需要登录，请先登录");
// req.getRequestDispatcher("/user/login.jsp").forward(request, response);
res.sendRedirect(req.getContextPath()+"/user/login.jsp");
}else {
chain.doFilter(request, response);
}
}
@Override
public void destroy() {
// TODO Auto-generated method stub
}
}在web.xml中配置
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>filter.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>（要拦截的）</url-pattern>
</filter-mapping>源码
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