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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