Java教程
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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