java各种功能实现代码,java实用代码

求简单实现网上商城功能的java代码

平时在线10k人大概是让你创建一个数据库连接池，大小设置10k。

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下面是一个图书商城的数据库表部分，供你参考

set utf8

DROP TABLE IF EXISTS d_product;

CREATE TABLE d_product (//用来存放总商品，入图书种类

id int(12) NOT NULL auto_increment,

product_name varchar(100) NOT NULL,

description varchar(100) default NULL,

add_time bigint(20) default NULL,

fixed_price double NOT NULL,

dang_price double NOT NULL,

keywords varchar(200) default NULL,

has_deleted int(1) NOT NULL default '0',

product_pic varchar(200) default NULL,

PRIMARY KEY (id)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO d_product VALUES (23,'上课睡觉的故事','上课睡觉的故事',1237873000234,200,180,'key',0,'15.jpg');

DROP TABLE IF EXISTS d_book;

CREATE TABLE d_book (//用来存放图书的具体内容

id int(12) NOT NULL,

author varchar(200) NOT NULL,

publishing varchar(200) NOT NULL,

publish_time bigint(20) NOT NULL,

word_number varchar(15) default NULL,

which_edtion varchar(15) default NULL,

total_page varchar(15) default NULL,

print_time int(20) default NULL,

print_number varchar(15) default NULL,

isbn varchar(25) default NULL,

author_summary text NOT NULL,

catalogue text NOT NULL,

PRIMARY KEY (id)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO d_book VALUES (24,'阿斗,'地球出版社',1237873000234,'1万','1','100',1,NULL,'12345678','无描述,'好书！');

DROP TABLE IF EXISTS d_category;

CREATE TABLE d_category (//商城图书目录

id int(12) NOT NULL auto_increment,

turn int(10) NOT NULL,

en_name varchar(200) NOT NULL,

name varchar(200) NOT NULL,

description varchar(200),

parent_id int(10),

PRIMARY KEY (id)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO d_category VALUES (1,1,'Book','图书',NULL,0);

DROP TABLE IF EXISTS d_category_product;

CREATE TABLE d_category_product (//这个是连接目录和书籍具体信息的表

id int(12) NOT NULL auto_increment,

product_id int(10) NOT NULL,

cat_id int(10) NOT NULL,

PRIMARY KEY (id)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO d_category_product VALUES (72,24,1);

DROP TABLE IF EXISTS d_item;

CREATE TABLE d_item (//这个订单条目表

id int(12) NOT NULL auto_increment,

order_id int(10) NOT NULL,

product_id int(10) NOT NULL,

product_name varchar(100) NOT NULL,

dang_price double NOT NULL,

product_num int(10) NOT NULL,

amount double NOT NULL,

PRIMARY KEY (id)

)

DROP TABLE IF EXISTS d_order;

CREATE TABLE d_order (//订单表

id int(10) NOT NULL auto_increment,

user_id int(10) NOT NULL,

status int(10) NOT NULL,

order_time bigint(20) NOT NULL,

order_desc varchar(100) default NULL,

total_price double NOT NULL,

receive_name varchar(100) default NULL,

full_address varchar(200) default NULL,

postal_code varchar(8) default NULL,

mobile varchar(20) default NULL,

phone varchar(20) default NULL,

PRIMARY KEY (id)

) ENGINE=InnoDB;

DROP TABLE IF EXISTS d_receive_address;

CREATE TABLE d_receive_address (//收件人信息表

id int(12) NOT NULL auto_increment,

user_id int(11) NOT NULL,

receive_name varchar(20) NOT NULL,

full_address varchar(200) NOT NULL,

postal_code varchar(8) NOT NULL,

mobile varchar(15) default NULL,

phone varchar(20) default NULL,

PRIMARY KEY (id)

) ENGINE=InnoDB;

insert into d_receive_address values(1, 6,'Java','sun.cn','10000800','12345','67890');

insert into d_receive_address values(2, 6,'JavaJavaJava','ibm.cn','10000600','12345','67890');

DROP TABLE IF EXISTS d_user;

CREATE TABLE d_user (//用户表，用户信息

id int(12) NOT NULL auto_increment,

email varchar(50) NOT NULL,

nickname varchar(50) default NULL,

password varchar(50) NOT NULL,

user_integral int(12) NOT NULL default '0',

is_email_verify char(3),

email_verify_code varchar(50) default NULL,

last_login_time bigint default NULL,

last_login_ip varchar(15) default NULL,

PRIMARY KEY (id),

UNIQUE KEY email (email)

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

利用java编写代码实现如下功能，需要全部代码

很简单的应用，为了节省字数，代码注释我就不加了

首先是显示层，LoinWindow：

import java.awt.FlowLayout;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.FocusEvent;

import java.awt.event.FocusListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.border.EmptyBorder;

public class LoinWindow extends JFrame implements ActionListener, FocusListener {

private JPanel mainPanel, namePanel, btnPanel;

private JTextField tfName, tfPsd;

private JButton btnLogin, btnCancel;

private static final int WIDTH = 300;

private static final int HEIGHT = 200;

private LoginService service = new LoginService();

public LoinWindow() {

super("登录窗体");

}

public void launch() {

setSize(WIDTH, HEIGHT);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

GridLayout mainLayout = new GridLayout(2, 1);

mainLayout.setVgap(10);

mainPanel = new JPanel(mainLayout);

GridBagLayout nameLayout = new GridBagLayout();

namePanel = new JPanel(nameLayout);

namePanel.setBorder(new EmptyBorder(10, 10, 10, 10));

JLabel nameLabel = new JLabel("姓名：");

tfName = new JTextField();

JLabel psdLabel = new JLabel("密码：");

tfPsd = new JTextField();

JLabel blank = new JLabel(" ");

namePanel.add(nameLabel);

namePanel.add(tfName);

namePanel.add(blank);

namePanel.add(psdLabel);

namePanel.add(tfPsd);

GridBagConstraints s = new GridBagConstraints();

s.fill = GridBagConstraints.BOTH;

s.gridwidth = 1;

s.weightx = 0;

s.weighty = 0;

nameLayout.setConstraints(nameLabel, s);

s.gridwidth = 0;

s.weightx = 1;

s.weighty = 0;

nameLayout.setConstraints(tfName, s);

s.gridwidth = 0;

s.weightx = 4;

s.weighty = 0;

nameLayout.setConstraints(blank, s);

s.gridwidth = 1;

s.weightx = 0;

s.weighty = 0;

nameLayout.setConstraints(psdLabel, s);

s.gridwidth = 3;

s.weightx = 1;

s.weighty = 0;

nameLayout.setConstraints(tfPsd, s);

FlowLayout btnLayout = new FlowLayout();

btnLayout.setAlignment(FlowLayout.CENTER);

btnPanel = new JPanel(btnLayout);

btnLogin = new JButton("确定");

btnCancel = new JButton("取消");

btnPanel.add(btnLogin);

btnPanel.add(btnCancel);

btnCancel.addActionListener(this);

btnLogin.addActionListener(this);

mainPanel.add(namePanel);

mainPanel.add(btnPanel);

setContentPane(mainPanel);

tfName.addFocusListener(this);

tfPsd.addFocusListener(this);

pack();

setSize(WIDTH, HEIGHT);

setLocationRelativeTo(null);

}

@Override

public void actionPerformed(ActionEvent e) {

Object source = e.getSource();

if(source == btnCancel) {

System.exit(0);

} else if(source == btnLogin) {

String username = tfName.getText();

String password = tfPsd.getText();

boolean success = service.login(username, password);

if(success) {

warn("成功", "登录成功！");

} else {

warn("失败", "您输入的用户名或密码错误！");

}

@Override

public void focusGained(FocusEvent arg0) {

}

@Override

public void focusLost(FocusEvent e) {

Object source = e.getSource();

if(source == tfName) {

String username = tfName.getText();

try {

service.matchUsername(username);

} catch (LoginException e1) {

warn("验证错误", e1.getMessage());

}

} else if(source == tfPsd) {

String password = tfPsd.getText();

try {

service.matchPassword(password);

} catch (LoginException e1) {

warn("验证错误", e1.getMessage());

}

private void warn(String title, String msg) {

JOptionPane.showMessageDialog(null, msg, title, JOptionPane.INFORMATION_MESSAGE);

}

public static void main(String[] args) {

new LoinWindow().launch();

}

然后是模型层：LoginDao

public class LoginDao {

public boolean login(String username, String password) {

if(username.equals("admin") password.equals("12345")) {

return true;

}

return false;

}

LoginService

import java.util.regex.Pattern;

public class LoginService {

private static final Pattern LOGIN_PATTERN = Pattern.compile("[a-zA-Z]+");

private static final Pattern PASSWORD_PATTERN = Pattern.compile("[1-9]+");

private LoginDao dao = new LoginDao();

public boolean matchUsername(String username) throws LoginException {

if(null == username || username.isEmpty()) {

return false;

}

if(!LOGIN_PATTERN.matcher(username).matches()) {

throw new LoginException("您输入的用户名不合法，请输入英文！");

}

return true;

}

public boolean matchPassword(String password) throws LoginException {

if(null == password || password.isEmpty()) {

return false;

}

if(!PASSWORD_PATTERN.matcher(password).matches()) {

throw new LoginException("您输入的密码不合法，请输入数字！");

}

return true;

}

public boolean login(String username, String password) {

if(null == username || username.isEmpty()) {

return false;

}

if(null == password || password.isEmpty()) {

return false;

}

if(!dao.login(username, password)) {

return false;

}

return true;

}

LoginException

public class LoginException extends Exception {

public LoginException(String arg0) {

super(arg0);

}

不知道分层设计思想是不是我想的这样

java代码功能

Java 是一种编程语言,它本身的作用是通过编写应用程序，帮助人们解决日常工作、生活和学习遇到的问题。

一些常见的java功能代码。如复制文件夹及文件到指定目录，遍历指定盘符所有文件，检索字符串是否符合指定要求。

关于java中计算机的功能实现代码求大神指导

import java.util.Scanner;

import java.awt.*;

import java.awt.event.*;

public class Test extends WindowAdapter {

Panel p1 = new Panel();

Panel p2 = new Panel();

Panel p3 = new Panel();

TextField txt;

private Button[] b = new Button[17];

private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2",

"3", "*", "clear", "0", "=", "/", "close" };

static double a;

static String s, str;// 定义变量创建对像

public static void main(String args[]) {

(new Test()).frame();

}

public void frame() {

Frame fm = new Frame("简单计算器");

for (int i = 0; i = 16; i++) {

b[i] = new Button(ss[i]);

}

for (int i = 0; i = 15; i++) {

p2.add(b[i]);

} // 创建按钮并添加到P2

b[16].setBackground(Color.yellow);

txt = new TextField(15);

txt.setEditable(false);

for (int i = 0; i = 16; i++) {

b[i].addActionListener(new buttonlistener());// 添加监听器

}

b[16].addActionListener(new close());

fm.addWindowListener(this);

fm.setBackground(Color.red);

p1.setLayout(new BorderLayout());

p1.add(txt, "North");

p2.setLayout(new GridLayout(4, 4));

p3.setLayout(new BorderLayout());

p3.add(b[16]);

fm.add(p1, "North");

fm.add(p2, "Center");

fm.add(p3, "South");

fm.pack();

fm.setVisible(true);// 都是些窗中设置添加相关组件和监听器

}

public void windowClosing(WindowEvent e) {

System.exit(0);// 退出系统

}

class buttonlistener implements ActionListener {// 编写监听器事件通过按键得出给果

public void actionPerformed(ActionEvent e) {

Button btn = (Button) e.getSource();

if (btn.getLabel() == "=") {

jisuan();

str = String.valueOf(a);

txt.setText(str);

s = "";

} else if (btn.getLabel() == "+") {

jisuan();

txt.setText("");

s = "+";

} else if (btn.getLabel() == "-") {

jisuan();

txt.setText("");

s = "-";

} else if (btn.getLabel() == "/") {

jisuan();

txt.setText("");

s = "/";

} else if (btn.getLabel() == "*") {

jisuan();

txt.setText("");

s = "*";

} else {

txt.setText(txt.getText() + btn.getLabel());

if (btn.getLabel() == "clear")

txt.setText("");

}

public void jisuan() {// 编写具体计算方法

if (s == "+")

a += Double.parseDouble(txt.getText());

else if (s == "-")

a -= Double.parseDouble(txt.getText());

else if (s == "*")

a *= Double.parseDouble(txt.getText());

else if (s == "/")

a /= Double.parseDouble(txt.getText());

else

a = Double.parseDouble(txt.getText());

}

class close implements ActionListener {// 退出

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

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java各种功能实现代码,java实用代码

求简单实现网上商城功能的java代码

利用java编写代码实现如下功能，需要全部代码

java代码功能

关于java中计算机的功能实现代码求大神指导

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