设计模式第一次试验

 

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package Test;   public class MainClass {             public static void main(String[] args)      {             LoginForm loginForm=new LoginForm() ;    //调用             loginForm.display();                       }   } package Test;   import java.awt.*; import java.awt.event.*; import javax.swing.*;   public class LoginForm extends JFrame {           private static final long serialVersionUID = 1L;     private  UserDao dao = new UserDao();     //设置按钮组件           private  JButton jb=new JButton("登录");    //添加一个登录按钮     private JButton button=new JButton("重置");    //添加一个确定按钮     //设置文本框组件     private JTextField username = new JTextField();//用户名框     private JPasswordField password = new JPasswordField();//密码框：为加密的***           JLabel user_name=new JLabel("账号：");//设置左侧用户名文字     JLabel pass_word=new JLabel("密码：");//设置左侧密码文字           public void init()     {     /* 组件绝对位置  */     user_name.setBounds(50, 70, 300, 25);     pass_word.setBounds(50, 130, 200, 25);               username.setBounds(110, 70, 300, 25);//设置用户名框的宽，高，x值，y值     password.setBounds(110, 130, 300, 25);//设置密码框的宽，高，x值，y值               button.setBounds(315, 225, 90, 20);//设置确定按钮的宽，高，x值，y值     jb.setBounds(95, 225, 90, 20);//设置确定按钮的宽，高，x值，y值                         /* 组件透明化*/     user_name.setOpaque(false);     pass_word.setOpaque(false);                          //监听事件     jb.addActionListener(new ActionListener(){        //为确定按钮添加监听事件                           @SuppressWarnings("deprecation")         public void actionPerformed(ActionEvent arg0) {             validate(username.getText().trim(),password.getText().trim());         }     });                             //重置按钮     button.addActionListener(new ActionListener(){        //为重置按钮添加监听事件         //同时清空name、password的数据         public void actionPerformed(ActionEvent arg0) {             // TODO 自动生成方法存根             username.setText("");             password.setText("");         }     });               }           public void display()      {     JFrame f =new JFrame();     f.setTitle("登录页面");         //窗口退出行为         f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         //设置窗口大小不可变         f.setResizable(false);         //设置窗口打开居中         f.setLocationRelativeTo(null);         //窗口大小         f.setSize(500, 300);                  init();                   //添加组件         Container contentPanel= new Container();//添加一个contentPanel容器          contentPanel.setLayout(null);//设置添加的contentPanel容器为流布局管理器          contentPanel.add(user_name);          contentPanel.add(pass_word);          contentPanel.add(username);          contentPanel.add(password);          contentPanel.add(jb);          contentPanel.add(button);                       f.add(contentPanel);              //展示窗口             f.setVisible(true);     }            public  void  validate(String username,String password)      {                      if(username.trim().length()==0||password.trim().length()==0){        JOptionPane.showMessageDialog(null, "用户名,密码不允许为空");                                     }                   if(dao.findUser(username, password))         {                         JOptionPane.showMessageDialog(null, "登录成功！");                                          }else {               JOptionPane.showMessageDialog(null, "用户名或密码错误");                          }                   }          } package Test;   import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement;   public class UserDao {     public boolean findUser(String username, String password) {         //准备SQL语句         String sql = "select * from user where user_name='" + username + "'";         Connection conn= DBUtil.getConn();         //创建语句传输对象         Statement state = null;         ResultSet rs= null;         int flag=0;         String c_password=null;         try {             state = conn.createStatement();             rs = state.executeQuery(sql);             while(rs.next()) {                 ++flag;                 c_password=rs.getString("password");             }    if (flag == 0) {                 return false;             }             if (!password.equals(c_password)) {   //判断密码                 return false;             }     }catch (SQLException e) {         // TODO Auto-generated catch block         e.printStackTrace();     }finally {          DBUtil.close(rs, state, conn);     }     return true;         } }package Test;   import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class DBUtil {       public static String db_url = "jdbc:mysql://localhost:3306/sams?serverTimezone=GMT%2B8&useSSL=false&severTimezone=UTC&seUnicode=true&characterEncoding=UTF-8";     public static String db_user = "root";     public static String db_pass = "13666871023";       public static Connection getConn () {         Connection conn = null;           try {             Class.forName("com.mysql.jdbc.Driver");             conn = DriverManager.getConnection(db_url, db_user, db_pass);         } catch (Exception e) {             e.printStackTrace();         }           return conn;     }//end getConn       public static void close (Statement state, Connection conn) {         if (state != null) {             try {                 state.close();             } catch (SQLException e) {                 e.printStackTrace();             }         }           if (conn != null) {             try {                 conn.close();             } catch (SQLException e) {                 e.printStackTrace();             }         }     }       public static void close (ResultSet rs, Statement state, Connection conn) {         if (rs != null) {             try {                 rs.close();             } catch (SQLException e) {                 e.printStackTrace();             }         }           if (state != null) {             try {                 state.close();             } catch (SQLException e) {                 e.printStackTrace();             }         }           if (conn != null) {             try {                 conn.close();             } catch (SQLException e) {                 e.printStackTrace();             }         }     }       public static void main(String[] args) throws SQLException {         Connection conn = getConn();         PreparedStatement pstmt = null;         ResultSet rs = null;         String sql ="select * from user";         pstmt = conn.prepareStatement(sql);         rs = pstmt.executeQuery();         if(rs.next()){             System.out.println("连接成功");         }else{             System.out.println("连接失败");         }     } }

　　

 

[实验任务三]：依赖倒转原则与合成复用原则

在一画图软件中提供了多种大小不同的画笔，并且可以给画笔指定不同的颜色，某设计人员对画笔进行了如上图所示的设计。通过分析，可以发现增加画笔的种类和颜色会使得系统中类的数目急剧增加，请根据合成复用原则和依赖倒转原则对上述设计进行重构。

实验要求：

1. 提交源代码；

package 依赖倒转;

 

public class Pen {

 

//型号

public abstract class Size {

public abstract void sizePen();

}

 

public class SmallPen extends Size{

//小型

public void sizePen() {

System.out.println("小型");

}

}

public class MiddlePen extends Size{

//中型

public void sizePen() {

System.out.println("中型");

}

}

public class BigPen extends Size{

//大型

public void sizePen() {

System.out.println("大型");

}

}

 

//颜色

public abstract class Color {

//需要实现的方法

public abstract void colorPen();

}

//绿色

public class GreenPen extends Color{

public void colorPen() {

System.out.println("绿色");

}

}

//红色

public class RedPen extends Color{

 

public void colorPen() {

// TODO Auto-generated method stub

System.out.println("红色");

 

}

 

}

}

 

2.画出重构后的类图。