java练手（供本人观看 如果有人观看 欢迎提出意见 ）残版实时更新

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无说明 练手小项目 残版 实时更新

package com;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.net.URL;

public class LoginView extends JFrame {


    JLabel nameLabel = new JLabel("DX 成绩管理中心", JLabel.CENTER);
    SpringLayout springLayout = new SpringLayout();
    JPanel centerPanel = new JPanel(springLayout);
    JLabel userNameLabel = new JLabel("用户名");
    JTextField userTxt = new JTextField();
    JLabel pwdLabel = new JLabel("密码");
    JPasswordField pwdField = new JPasswordField();
    JButton loginBtn = new JButton("登录");
    JButton resetBtn = new JButton("重置");

    SystemTray systemTray;
    TrayIcon  trayIcon;

    LoginHandler loginHandler;
    public LoginView() {

        super("DX 成绩管理中心");
        Container contentPane = getContentPane();
         loginHandler=new LoginHandler(this);

        nameLabel.setFont(new Font("华文行楷", Font.PLAIN, 40));
        nameLabel.setPreferredSize(new Dimension(0, 80));
        Font centerFont = new Font("楷体", Font.PLAIN, 20);
        userNameLabel.setFont(centerFont);
        loginBtn.setFont(centerFont);
        resetBtn.setFont(centerFont);
        pwdLabel.setFont(centerFont);
        userTxt.setPreferredSize(new Dimension(200, 30));
        pwdField.setPreferredSize(new Dimension(200, 30));
//        把组建加入面板
        centerPanel.add(userNameLabel);
        centerPanel.add(userTxt);
        centerPanel.add(pwdLabel);
        centerPanel.add(pwdField);
        loginBtn.addActionListener(loginHandler);
//        增加按键事件
        loginBtn.addKeyListener(loginHandler);
        centerPanel.add(loginBtn);
        resetBtn.addActionListener(loginHandler);
        centerPanel.add(resetBtn);

//        弹簧布局
        layoutCenter();


        contentPane.add(nameLabel, BorderLayout.NORTH);
        contentPane.add(centerPanel, BorderLayout.CENTER);

        if (SystemTray.isSupported()){
            systemTray=SystemTray.getSystemTray();
            URL resource = LoginView.class.getResource("/自定义图片/1.jpg");
            trayIcon=new TrayIcon(new ImageIcon(resource).getImage());
//            设置托盘大小自动缩放
            trayIcon.setImageAutoSize(true );
            try {
                systemTray.add(trayIcon);
            } catch (AWTException e) {
                e.printStackTrace();
            }
//           增加最小化时销毁资源
            this.addWindowListener(new WindowAdapter() {
                @Override
                public void windowIconified(WindowEvent e) {
                    LoginView.this.dispose();
                }
            });
//           托盘事件监听
            trayIcon.addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    int clickCount = e.getClickCount();
                    if (clickCount==1){
                       LoginView.this.setExtendedState(JFrame.NORMAL);
                    }
                    LoginView.this.setVisible(true);
                }
            });

        }

        URL resource = LoginView.class.getResource("/自定义图片/1.jpg");
        setIconImage(new ImageIcon(resource).getImage());




//  设置默认按钮
        getRootPane().setDefaultButton(loginBtn);

        setLocationRelativeTo(null);
//     关闭退出程序
        setDefaultCloseOperation(EXIT_ON_CLOSE);
//        大小不可改变
        setResizable(false);
        setVisible(true);
        setSize(600, 400);
    }

//    弹簧布局

    private void layoutCenter() {
        //        开始布局userNameLabel
        Spring childWidth = Spring.sum(Spring.sum(Spring.width(userNameLabel), Spring.width(userTxt)), Spring.constant(20));
        int offsetX = childWidth.getValue() / 2;
        springLayout.putConstraint(SpringLayout.WEST,userNameLabel,-offsetX,SpringLayout.HORIZONTAL_CENTER,centerPanel);

        springLayout.putConstraint(SpringLayout.NORTH,userNameLabel,20,SpringLayout.NORTH,centerPanel);
//        userTxt
        springLayout.putConstraint(SpringLayout.WEST,userTxt,20,SpringLayout.EAST,userNameLabel);
        springLayout.putConstraint(SpringLayout.NORTH,userTxt,0,SpringLayout.NORTH,userNameLabel);
//        pwdLabel
        springLayout.putConstraint(SpringLayout.EAST,pwdLabel,0,SpringLayout.EAST,userNameLabel);
        springLayout.putConstraint(SpringLayout.NORTH,pwdLabel,20,SpringLayout.SOUTH,userNameLabel);
//        pwdField
        springLayout.putConstraint(SpringLayout.WEST,pwdField,20,SpringLayout.EAST,userNameLabel);
        springLayout.putConstraint(SpringLayout.NORTH,pwdField,0,SpringLayout.NORTH,pwdLabel);
//        loginBtn
        springLayout.putConstraint(SpringLayout.WEST,loginBtn ,-40,SpringLayout.EAST,userNameLabel);
        springLayout.putConstraint(SpringLayout.NORTH,loginBtn,80,SpringLayout.NORTH,pwdField);
//        resetBtn

        springLayout.putConstraint(SpringLayout.WEST,resetBtn,80,SpringLayout.EAST,loginBtn);
        springLayout.putConstraint(SpringLayout.NORTH,resetBtn,0,SpringLayout.NORTH,loginBtn);
    }

    public static void main(String[] args) {

        new LoginView();
    }

    public JTextField getUserTxt() {
        return userTxt;
    }

    public void setUserTxt(JTextField userTxt) {
        this.userTxt = userTxt;
    }

    public JPasswordField getPwdField() {
        return pwdField;
    }


}



```java
package com;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

public class LoginHandler extends KeyAdapter implements ActionListener {


    private LoginView loginView;

    public LoginHandler(LoginView loginView) {

        this.loginView=loginView;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        JButton jButton = (JButton) e.getSource();
        String text = jButton.getText();
        if ("重置".equals(text)){
             loginView.getUserTxt().setText("");
             loginView.getPwdField().setText("");
        }else if ("登录".equals(text)){
            login();
        }
    }

    private void login() {
        String user = loginView.getUserTxt().getText();
        char[] chars = loginView.getPwdField().getPassword();
        String pwd = new String(chars);
        System.out.println(user + ":" + pwd);
//            查询db
        boolean flag=false;
        if (flag){
//  验证成功跳转到主界面并且销毁登录界面
        }else {
            JOptionPane.showMessageDialog(loginView,"用户名密码错误");
        }
    }

    @Override
    public void keyPressed(KeyEvent e) {
     
        if (KeyEvent.VK_ENTER == e.getKeyCode()) {
            login();
        }
    }
}

package com;

import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.util.Vector;

public class JtableDemo  extends JFrame {


    public JtableDemo() {
      super("测试Jtable");


        Vector<Vector<Object>>  data=new Vector<>();

        Vector<Object> rowVector1=new Vector<>();
        rowVector1.addElement("1");
        rowVector1.addElement("张三");
        rowVector1.addElement("no1");
        rowVector1.addElement("甘肃");
        rowVector1.addElement("1");
        rowVector1.addElement("2");
        rowVector1.addElement("3");
        rowVector1.addElement("6");

        Vector<Object> rowVector2=new Vector<>();
        rowVector2.addElement("1");
        rowVector2.addElement("张三");
        rowVector2.addElement("no1");
        rowVector2.addElement("甘肃");
        rowVector2.addElement("1");
        rowVector2.addElement("2");
        rowVector2.addElement("3");
        rowVector2.addElement("6");

        Vector<Object> rowVector3=new Vector<>();
        rowVector3.addElement("1");
        rowVector3.addElement("张三");
        rowVector3.addElement("no1");
        rowVector3.addElement("甘肃");
        rowVector3.addElement("1");
        rowVector3.addElement("2");
        rowVector3.addElement("3");
        rowVector3.addElement("6");

        data.addElement(rowVector1);
        data.addElement(rowVector2);
        data.addElement(rowVector3);


        StudentTableModel studentTableModel = StudentTableModel.assembleModel(data);


        JTable jTable = new JTable(studentTableModel);

//        设置表头
        JTableHeader tableHeader = jTable.getTableHeader();
        tableHeader.setFont(new Font("华文楷体",Font.BOLD,16));
        tableHeader.setForeground(Color.RED);
//        设置表格体
        jTable.setFont(new Font("华文楷体",Font.BOLD,14));
        jTable.setForeground(Color.black);
        jTable.setGridColor(Color.black);
        jTable.setRowHeight(30);

//        设置多行选择
        jTable.getSelectionModel().setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

//        设置表格列的渲染方式
        Vector<String> columns = StudentTableModel.getColumns();

        StudentCellRender render = new StudentCellRender();
        for (int i = 0; i < columns.size(); i++) {
            TableColumn column = jTable.getColumn(columns.get(i));
            column.setCellRenderer(render);
            if (i==0){
                column.setPreferredWidth(50);
                column.setResizable(false);
            }
        }
        




        Container contentPane = getContentPane();

//        jtable放在jpanel上的话，默认是不展示列头的，需要特殊设置 放在jscrollpane上面
//        默认是展示列头的
        JScrollPane jScrollPane=new JScrollPane(jTable);

        contentPane.add(jScrollPane);


        setLocationRelativeTo(null);
//     关闭退出程序
        setDefaultCloseOperation(EXIT_ON_CLOSE);
//        大小不可改变
        setResizable(false);
        setVisible(true);
        setSize(600, 400);
    }


    public static void main(String[] args) {
        new JtableDemo();
    }
}

class StudentCellRender  extends DefaultTableCellRenderer {

//    在每一行的每一列显示之前都会调用


    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {

        if (row %2==0){
            setBackground(Color.LIGHT_GRAY);
        }else {
            setBackground(Color.white);
        }

        setHorizontalAlignment(DefaultTableCellRenderer.CENTER);

        return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
    }
}



//自定义tablemdel
class StudentTableModel extends DefaultTableModel{

     static Vector<String>  columns =new Vector<>();

     static {
         columns.addElement("编号");
         columns.addElement("姓名");
         columns.addElement("学号");
         columns.addElement("语文");
         columns.addElement("数学");
         columns.addElement("英语");
         columns.addElement("总分");

     }

     private StudentTableModel(){
         super(null,columns);
     }

     private static StudentTableModel studentTableModel=new StudentTableModel();

     public static StudentTableModel  assembleModel(Vector<Vector<Object>> data){

         studentTableModel.setDataVector(data,columns);

         return studentTableModel;
     }

    public static Vector<String> getColumns() {
        return columns;
    }

    @Override
    public boolean isCellEditable(int row, int column) {
        return false;
    }
}

package com;

import javax.swing.*;
import java.awt.*;

public class MainView extends JFrame {


    public MainView() {


        JLabel nameLabel = new JLabel("DX 成绩管理中心", JLabel.CENTER);
        Container contentPane = getContentPane();

        setLocationRelativeTo(null);
//     关闭退出程序
        setDefaultCloseOperation(EXIT_ON_CLOSE);
//        大小不可改变
        setResizable(false);
        setVisible(true);
        setSize(600, 400);


    }

    public static void main(String[] args) {
      new MainView();
    }
}

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