JAVAWEB实现简单的商城项目(一)实例代码解析

JAVAWEB实现简单的商城项目(一)实例代码解析

一.项目功能结构

1.功能

2.实体

3.对应sql语句

CREATE DATABASE shop;

use shop;

create table user(

id int(11) primary key auto_increment,

username varchar(100),

password varchar(100),

nickname varchar(100),

type int(5)

);

INSERT INTO user VALUES (null,'admin','7946521','管理员',1);

CREATE TABLE address(

id INT(10) PRIMARY KEY AUTO_INCREMENT,

name VARCHAR(255),

phone VARCHAR(100),

postcode VARCHAR(100),

user_id INT(10),

CONSTRAINT FOREIGN KEY (user_id) REFERENCES user(id)

);

INSERT INTO address VALUES (NULL ,'安徽阜阳','1234567890','236000','1');

SELECT t1.*,t2.* FROM address t1 LEFT JOIN user t2 ON t1.user_id = t2.id where t1.user_id =1 ;

create table orders(

id int(11) primary key auto_increment,

buy_date datetime,

pay_date datetime,

confirm_date datetime,

status int(5),

user_id int(11),

address_id int(11),

CONSTRAINT FOREIGN KEY(user_id) REFERENCES user(id),

CONSTRAINT FOREIGN KEY(address_id) REFERENCES address(id)

);

create table category(

id int(11) primary key auto_increment,

name varchar(100)

);

create table goods(

id int(11) primary key auto_increment,

name varchar(100),

price double,

intro text,

img varchar(100),

stock int(10),

c_id int(10),

CONSTRAINT FOREIGN KEY(c_id) REFERENCES category(id)

);

create table goods_orders(

id int(11) primary key auto_increment,

goods_id int(10),

orders_id int(10),

CONSTRAINT FOREIGN KEY(goods_id) REFERENCES goods(id),

CONSTRAINT FOREIGN KEY(orders_id) REFERENCES orders(id)

);

二.项目准备

1.实体类实现

分别建立dao,filter,model,util的包,并在model中实现实体类,这里以User.java为例.

注意对于数据库中外键,比如adress表中有外键user_id,那么在Adress.java中就可以直接给个User对象,在取adress表的时候就把user一并取出来.

User.java

package com.model;

import java.util.List;

/**

* Created by nl101 on 2016/2/22.

*/

public class User {

private int id;//id

private String username;

private String password;

private String nickname;//昵称

private int type;//1表示管理员,2表示注册用户

private List

public List

return addresses;

}

public void setAddresses(List

this.addresses = addresses;

}

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 int getType() {

return type;

}

public void setType(int type) {

this.type = type;

}

}

Adress.java

package com.model;

/**

* Created by nl101 on 2016/2/22.

*wbIJmkx/

public class Address {

private int id;

private String name;

private String phone;

private String postcode;

//直接给user对象,来代替user_id

private User user;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPhone() {

return phone;

}

public void setPhone(String phone) {

thwbIJmkxis.phone = phone;

}

public String getPostcode() {

return postcode;

}

public void setPostcode(String postcode) {

this.postcode = postcode;

}

public User getUser() {

return user;

}

public void setUser(User user) {

this.user = user;

}

}

2.分页框架准备

分页主要是写pager.java和SystemContext.java以及SystemFilter.java三个类.可以参开前面的博文,jsp通用分页框架

完整建立后如下

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