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前台开发------开发添加用户数据库的方法

创建用户的表和数据模型类

立即购买这个模块需要事先有用户才能实现，因此我们需要创建用户表：users

用户表: user

列名	类型	说明	备注
id	int	id	主键
username	varchar	用户名
email	varchar	邮箱
password	varchar	密码
name	varchar	收货人
phone	varchar	收货电话
address	varchar	收货地址
isadmin	bit	是否是管理员
isvalidate	bit	邮箱是否验证

在MySQL中创建该表：user

在model层创建用户的数据模型类：

User.java

package com.guiyan.model;

public class User {
    private String username;
    private String email;
    private String password;
    private String name;
    private String phone;
    private String address;
    private boolean isadmin;
    private boolean isvalidate;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public boolean isIsadmin() {
        return isadmin;
    }
    public void setIsadmin(boolean isadmin) {
        this.isadmin = isadmin;
    }
    public boolean isIsvalidate() {
        return isvalidate;
    }
    public void setIsvalidate(boolean isvalidate) {
        this.isvalidate = isvalidate;
    }
    public User(String username, String email, String password, String name, String phone, String address,
            boolean isadmin, boolean isvalidate) {
        super();
        this.username = username;
        this.email = email;
        this.password = password;
        this.name = name;
        this.phone = phone;
        this.address = address;
        this.isadmin = isadmin;
        this.isvalidate = isvalidate;
    }
    public User() {
        super();
    }
    
    
    
    
    

}

开发注册页面，创建处理注册的Servlet

注册页面：

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
 4 
 5 <!DOCTYPE html>
 6 <html>
 7 <head>
 8     <title>用户注册</title>
 9     <meta name="viewport" content="width=device-width, initial-scale=1">
10     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
11     <link type="text/css" rel="stylesheet" href="css/bootstrap.css">
12     <link type="text/css" rel="stylesheet" href="css/style.css">
13     <script type="text/javascript" src="js/jquery.min.js"></script>
14     <script type="text/javascript" src="js/bootstrap.min.js"></script>
15     <script type="text/javascript" src="js/simpleCart.min.js"></script>
16 </head>
17 <body>
18 
19     
20 
21 
22 
23 
24 
25     <!--header-->
26     <jsp:include page="/header.jsp"></jsp:include>
27     
28     <!--account-->
29     <div class="account">
30         <div class="container">
31             <div class="register">
32                 
33                 <form action="${pageContext.request.contextPath }/user_register" method="post"> 
34                     <div class="register-top-grid">
35                         <h3>注册新用户</h3>
36                         <div class="input">
37                             <span>用户名 <label style="color:red;">*</label></span>
38                             <input type="text" name="username" placeholder="请输入用户名" required="required"> 
39                         </div>
40                         <div class="input">
41                             <span>邮箱 <label style="color:red;">*</label></span>
42                             <input type="text" name="email" placeholder="请输入邮箱" required="required"> 
43                         </div>
44                         <div class="input">
45                             <span>密码 <label style="color:red;">*</label></span>
46                             <input type="text" name="password" placeholder="请输入密码" required="required"> 
47                         </div>
48                         <div class="input">
49                             <span>收货人<label></label></span>
50                             <input type="text" name="name" placeholder="请输入收货"> 
51                         </div>
52                         <div class="input">
53                             <span>收货电话<label></label></span>
54                             <input type="text" name="phone" placeholder="请输入收货电话"> 
55                         </div>
56                         <div class="input">
57                             <span>收货地址<label></label></span>
58                             <input type="text" name="address" placeholder="请输入收货地址"> 
59                         </div>
60                         <div class="clearfix"> </div>
61                     </div>
62                     <div class="register-but text-center">
63                        <input type="submit" value="提交">
64                        <div class="clearfix"> </div>
65                     </div>
66                 </form>
67                 <div class="clearfix"> </div>
68             </div>
69         </div>
70     </div>
71     <!--//account-->
72 
73     
74 
75 
76 
77 
78     <!--footer-->
79     <jsp:include page="/footer.jsp"></jsp:include>
80     <!--//footer-->
81 
82     
83 </body>
84 </html>

测试看是否能获取到数据，测试结果如下：

从图中可以看出已经获得了表单中的内容。

测试得该结果的代码：

UserRegisterServlet.java

@WebServlet("/user_register")
public class UserRegisterServlet extends HttpServlet {
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //参数的取得
    User user=new User();
        
        try {
            BeanUtils.copyProperties(user, request.getParameterMap());
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
        System.out.println(user);
    }
    

}

在dao层创建一个UserDao.java，里面进行书写查询的语句，用来校验用户名是否存在以及校验邮箱是否激活。

package com.guiyan.dao;

import java.sql.SQLException;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;

import com.guiyan.model.User;
import com.guiyan.utils.DBUtil;

public class UserDao {
    
        public void addUser(User user) throws SQLException {
            QueryRunner r = new QueryRunner(DBUtil.getDataSource());
            String sql = "insert into user(username,email,password,name,phone,address,isadmin,isvalidate) values(?,?,?,?,?,?,?,?)";
            r.update(sql,user.getUsername(),user.getEmail(),user.getPassword(),user.getName(),user.getPhone(),user.getAddress(),user.isIsadmin(),user.isIsvalidate());
        }
        
        ///校验用户名是否存在数据库
        public boolean isUsernameExist(String username) throws SQLException {
            QueryRunner r = new QueryRunner(DBUtil.getDataSource());
            String sql = "select * from user where username = ?";
            User u = r.query(sql, new BeanHandler<User>(User.class),username);
            if(u==null) {
                return false;
            }else {
                return true;
            }
        }
        
        
        public boolean isEmailExist(String email) throws SQLException {
            QueryRunner r = new QueryRunner(DBUtil.getDataSource());
            String sql = "select * from user where email = ?";
            User u = r.query(sql, new BeanHandler<User>(User.class),email);
            if(u==null) {
                return false;
            }else {
                return true;
            }
        }
}

在service层创建一个UserService.java,用来进行对异常的处理：

package com.guiyan.service;

import java.sql.SQLException;

import com.guiyan.dao.UserDao;
import com.guiyan.model.User;

public class UserService {
    
    private UserDao uDao=new UserDao();
    public boolean register(User user) {
        try {
            if(uDao.isUsernameExist(user.getUsername())){
                return false;
            }
            if(uDao.isEmailExist(user.getEmail())){
                return false;
            }
            uDao.addUser(user);
        
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
            return false;
        
        
    }

在UserRegisterServlet.java进行数据的获取：

package com.guiyan.servlet;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;

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 org.apache.commons.beanutils.BeanUtils;

import com.guiyan.model.User;
import com.guiyan.service.UserService;

/**
 * Servlet implementation class UserRegisterServlet
 */
@WebServlet("/user_register")
public class UserRegisterServlet extends HttpServlet {
    
    
    private UserService uService=new UserService();
    
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //参数的取得
    User user=new User();
        
        try {
            BeanUtils.copyProperties(user, request.getParameterMap());
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    
        uService.register(user);
        request.getRequestDispatcher("user_login.jsp").forward(request, response);
    }
    

}

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原文地址：https://www.cnblogs.com/jiguiyan/p/10615500.html