import java.awt.*;
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import java.awt.event.*;
import javax.swing.*;
public class JListDemo extends JFrame {
private JPanel topPanel;
private JList listbox;
public JListDemo(){
setTitle( "Simple ListBox Application" );
setSize( 300, 100 );
setBackground( Color.gray );
topPanel = new JPanel();
topPanel.setLayout( new BorderLayout() );
getContentPane().add( topPanel );
String listData[] =
{
"Item 1",
"Item 2",
"Item 3",
"Item 4"
};
listbox = new JList( listData );
topPanel.add( listbox, BorderLayout.CENTER );
}
public static void main( String args[] ) {
JListDemo mainFrame = new JListDemo();
mainFrame.setVisible( true );
}
}
一: 首先弄清题目的意思
A.需要的主要组件列表:
1. 创建一个窗口,窗口标题叫Information
2. 3个标签, 用于显示文字 Name Number Class
3. 3个文本框, 用于填写信息
4. 1个按钮, 文字是确认
5. 1个文本域
B.业务逻辑
1. 当点击按钮确认的时候, 把 文本框的信息显示到文本域
C.设计的主要技术
JLabel , JButton, JTextField ...等, 都是swing的组件 , 所以应该使用swing进行创建
二: 确定使用的布局
swing虽然重写了大部分的组件, 但是布局, 依旧沿袭awt技术
分析图片上的布局:
至少有2种方法可以实现,
方法一: 绝对布局 , 优点: 配合可视化GUI拖曳, 可以完美的实现图上的组件的位置
但是缺点也是致命的, 不同的操作系统平台下, 可能会出现位置的移动,
只适合开发平台, 移植效果差 . 所以不推荐使用
方法二: 灵活的表格布局, 配合流式布局 , 所有操作系统下,显示效果都比较统一.
三: 效果图
四: 参考代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FrameDemo extends JFrame {
//申明需要的组件
private final JTextField jtf1,jtf2,jtf3;
private final JTextArea jta;
public FrameDemo() {
setTitle("Information");//设置窗口标题
setSize(320, 360);//设置窗口大小
setLocationRelativeTo(null);//设置窗口居中
setDefaultCloseOperation(EXIT_ON_CLOSE);//设置关闭时退出虚拟机
getContentPane().setLayout(new FlowLayout());//设置窗口布局为流式布局
JPanel jp = new JPanel(new GridLayout(4, 2));//设置jp面板为表格布局4行2列
//第一行
JPanel jp01 = new JPanel();
JLabel jl1 = new JLabel("Name:");
jp01.add(jl1);
JPanel jp1 = new JPanel();
jtf1 = new JTextField(8);
jp1.add(jtf1);
//第二行
JPanel jp02 = new JPanel();
JLabel jl2 = new JLabel("Number:");
jp02.add(jl2);
JPanel jp2 = new JPanel();
jtf2 = new JTextField(8);
jp2.add(jtf2);
//第三行
JPanel jp03 = new JPanel();
JLabel jl3 = new JLabel("Class:");
jp03.add(jl3);
JPanel jp3 = new JPanel();
jtf3 = new JTextField(8);
jp3.add(jtf3);
//第四行
JPanel jp04 = new JPanel();
JLabel jl4 = new JLabel("");
jp04.add(jl4);
JPanel jp4 = new JPanel();
JButton jb = new JButton("确认");
jp4.add(jb);
jp.add(jp01);
jp.add(jp1);
jp.add(jp02);
jp.add(jp2);
jp.add(jp03);
jp.add(jp3);
jp.add(jp04);
jp.add(jp4);
getContentPane().add(jp);
jta = new JTextArea();
jta.setColumns(20);//设置文本域的大小
jta.setEditable(false);//设置文本域不可编辑
jta.setBackground(jp.getBackground());//设置文本域的背景色和面板一样
getContentPane().add(jta);
jb.addActionListener(new ActionListener() {//给按钮添加事件
public void actionPerformed(ActionEvent e) {//点击按钮,显示信息到文本域
String name = jtf1.getText();
String number = jtf2.getText();
String clazz = jtf3.getText();
jta.setText("You name is "+name+" number is "+number+" class is "+clazz);
}
});
}
public static void main(String[] args) {
new FrameDemo().setVisible(true);//创建窗口,被设置为可见
}
}
五: 拓展
虽然图形界面的实现方法是多样的, 我们一定要根据具体情况, 选择一个比较优化的 合理的, 符合业务逻辑的实现方法
package hao;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.io.File;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
public class ChatPanel extends JPanel {
private static final long serialVersionUID = 1L;
JButton send,record,saveRecord,image;
JTextArea inputArea;
JTextPane text;//注意用法****************************************************************************
JComboBox fontName = null, fontSize = null, fontStyle = null, fontColor = null,fontBackColor = null;
public StyledDocument doc = null; JScrollPane scrollPane;JPanel textChat;
JButton music;
public ChatPanel() {
setLayout(new BorderLayout());
text = new JTextPane();
text.setEditable(false);
doc = text.getStyledDocument();//跟踪文本和图片写到该区域的位置*************************************
scrollPane = new JScrollPane(text);
//注意下面对JComboBox的巧用***********************************************************************
String[] str_name = { "宋体", "黑体", "Dialog", "Gulim" };
String[] str_Size = { "12", "14", "18", "22", "30", "40" };
String[] str_Style = { "常规", "斜体", "粗体", "粗斜体" };
String[] str_Color = { "黑色", "红色", "蓝色", "黄色", "绿色" };
String[] str_BackColor = { "无色", "灰色", "淡红", "淡蓝", "淡黄", "淡绿" };
fontName = new JComboBox(str_name);
fontSize = new JComboBox(str_Size);
fontStyle = new JComboBox(str_Style);
fontColor = new JComboBox(str_Color);
fontBackColor = new JComboBox(str_BackColor);
fontName.setBackground(new Color(255,153,255));
fontSize.setBackground(new Color(255,153,255));
fontStyle.setBackground(new Color(255,153,255));
fontColor.setBackground(new Color(255,153,255));
fontBackColor.setBackground(new Color(255,153,255));
Box box = Box.createVerticalBox();//创建一个可以容纳多个Box组件的Box*******************************
Box box_1 = Box.createHorizontalBox();
Box box_2 = Box.createHorizontalBox();
Box box_4 = Box.createHorizontalBox();
box.add(box_1);
box.add(box_2);
box.add(box_4);
JLabel b1= new JLabel("字体~~"), b2 = new JLabel("样式~~"),b3 = new JLabel("字号~~"),b4 = new JLabel("颜色~~"),b5 = new JLabel("背景~~");
b1.setBackground(new Color(255,153,255));
b2.setBackground(new Color(255,153,255));
b3.setBackground(new Color(255,153,255));
b4.setBackground(new Color(255,153,255));
b5.setBackground(new Color(255,153,255));
box_1.add(b1);
box_1.add(fontName);
box_1.add(Box.createHorizontalStrut(8));
box_1.add(b2);
box_1.add(fontStyle);
box_1.add(Box.createHorizontalStrut(8));
box_1.add(b3);
box_1.add(fontSize);
box_2.add(Box.createHorizontalStrut(8));
box_2.add(b4);
box_2.add(fontColor);
box_2.add(Box.createHorizontalStrut(8));
box_4.add(b5);
box_4.add(fontBackColor);
textChat = new JPanel();
textChat.setLayout(new BorderLayout());
textChat.setBackground(new Color(255,153,255));
inputArea = new JTextArea(3, 20);
inputArea.setLineWrap(true); //设置文本区的换行策略。88888*********************************
send = new JButton("发送");
record=new JButton("显示记录");
saveRecord=new JButton("储存记录");
image=new JButton("表情");
send.setBackground(new Color(255,153,255));
record.setBackground(new Color(255,153,255));
saveRecord.setBackground(new Color(255,153,255));
image.setBackground(new Color(255,153,255));
Box box_3 = Box.createHorizontalBox();
box_3.add(send); box_3.add(Box.createHorizontalStrut(8));//设置按钮间距*************************888
box_3.add(record); box_3.add(Box.createHorizontalStrut(8)); //设置按钮间距*************************888
box_3.add(saveRecord); box_3.add(Box.createHorizontalStrut(8));//设置按钮间距*************************888
box_3.add(image);
box.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));//设置Box的边框线********************
box_3.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));
textChat.add(box,BorderLayout.NORTH);
textChat.add(inputArea,BorderLayout.CENTER);
textChat.add(box_3, BorderLayout.SOUTH);
inputArea.requestFocus(true);
inputArea.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),5));//设置输入窗口边框线*******************
text.setBorder(BorderFactory.createLineBorder(new Color(102,102,0),8));//设置输入窗口边框线*******************
JPanel audioPanel = new JPanel();//最上面的边框************************************************************************
audioPanel.setBackground(new Color(255,153,255));
audioPanel.setLayout(new GridLayout(1,1));
music = new JButton("想听就听");
music.setPreferredSize(new Dimension(320,50));
music.setBorder(BorderFactory.createLineBorder(Color.BLACK,10));//设置输入窗口边框线*******************
audioPanel.add(music);
add(audioPanel, BorderLayout.NORTH);
add(scrollPane,BorderLayout.CENTER);
add(textChat, BorderLayout.SOUTH);
}
void insertIcon(ImageIcon image) {
text.setCaretPosition(doc.getLength());
text.insertIcon(image);
insert(new MessageStyle());//?????????????????????????????????????????????????????????????????????????????/
}
public void insert(MessageStyle attrib) {
try {
doc.insertString(doc.getLength(), attrib.getText() + "\n", attrib.getAttrSet());//写完后接着换行************
} catch (BadLocationException e) {
e.printStackTrace();
}
}
public MessageStyle getMessageStyle(String line) {
MessageStyle att = new MessageStyle();
att.setText(line);
att.setName((String) fontName.getSelectedItem());
att.setSize(Integer.parseInt((String) fontSize.getSelectedItem()));
String temp_style = (String) fontStyle.getSelectedItem();
if (temp_style.equals("常规")) {
att.setStyle(MessageStyle.GENERAL);
}
else if (temp_style.equals("粗体")) {
att.setStyle(MessageStyle.BOLD);
}
else if (temp_style.equals("斜体")) {
att.setStyle(MessageStyle.ITALIC);
}
else if (temp_style.equals("粗斜体")) {
att.setStyle(MessageStyle.BOLD_ITALIC);
}
String temp_color = (String) fontColor.getSelectedItem();
if (temp_color.equals("黑色")) {
att.setColor(new Color(0, 0, 0));
}
else if (temp_color.equals("红色")) {
att.setColor(new Color(255, 0, 0));
}
else if (temp_color.equals("蓝色")) {
att.setColor(new Color(0, 0, 255));
}
else if (temp_color.equals("黄色")) {
att.setColor(new Color(255, 255, 0));
}
else if (temp_color.equals("绿色")) {
att.setColor(new Color(0, 255, 0));
}
String temp_backColor = (String) fontBackColor.getSelectedItem();
if (!temp_backColor.equals("无色")) {
if (temp_backColor.equals("灰色")) {
att.setBackColor(new Color(200, 200, 200));
}
else if (temp_backColor.equals("淡红")) {
att.setBackColor(new Color(255, 200, 200));
}
else if (temp_backColor.equals("淡蓝")) {
att.setBackColor(new Color(200, 200, 255));
}
else if (temp_backColor.equals("淡黄")) {
att.setBackColor(new Color(255, 255, 200));
}
else if (temp_backColor.equals("淡绿")) {
att.setBackColor(new Color(200, 255, 200));
}
}
return att;
}
}
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class Test26 {
public static void main(String[] args) {
final String userName = "abc";
final String passwrod = "123";
JFrame jFrame = new JFrame("登陆界面");
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 150);
jFrame.setResizable(false);
jFrame.setLayout(null);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel label1 = new JLabel("姓名");
label1.setBounds(10, 10, 100, 30);
jFrame.add(label1);
JLabel label2 = new JLabel("密码");
label2.setBounds(10, 40, 100, 30);
jFrame.add(label2);
final JTextField text1 = new JTextField();
text1.setBounds(50, 15, 130, 20);
jFrame.add(text1);
final JPasswordField text2 = new JPasswordField();
text2.setBounds(50, 45, 130, 20);
jFrame.add(text2);
JButton button = new JButton("Login");
button.setBounds(10, 75, 170, 40);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(userName.equals(text1.getText()) passwrod.equals(text2.getText())) {
JOptionPane.showMessageDialog(null, "登陆成功误", "提示", JOptionPane.INFORMATION_MESSAGE);
} else {
JOptionPane.showMessageDialog(null, "错误", "提示", JOptionPane.ERROR_MESSAGE);
text1.setText("");
text2.setText("");
}
}
});
jFrame.add(button);
jFrame.setVisible(true);
}
}
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import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class ReadBook extends JFrame {
JTextArea jta;
JTextField jtf;
JButton jb;
public ReadBook() {
jta = new JTextArea();
jtf = new JTextField(30);
jtf.setText("文件保存路径如c:\\ab.txt");
jb = new JButton("保存文字");
JPanel jp = new JPanel();
jp.add(jtf);
jp.add(jb);
add(jta);
add(jp, BorderLayout.SOUTH);
setBounds(500, 100, 500, 380);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
jb.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//-------------核心代码---------
String path = jtf.getText();
File f = new File(path);
String txt = jta.getText().replaceAll("\n", "\r\n");
try {
BufferedWriter bw = new BufferedWriter(new FileWriter(f));
bw.write(txt);//写入文件中
bw.close();
} catch (Exception e1) {
e1.printStackTrace();
}
//-------------核心代码---------
}
});
}
public static void main(String[] args) {
new ReadBook();
}
}
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.sql.*;
class LoginFrm extends JFrame implements ActionListener
{
JLabel lbl1=new JLabel("用户名");
JLabel lbl2=new JLabel("密码");
JTextField txt=new JTextField(15);
JPasswordField pf=new JPasswordField();
JButton btn1=new JButton("确定");
JButton btn2=new JButton("取消");
public LoginFrm()
{
this.setTitle("登陆");
JPanel jp=(JPanel)this.getContentPane();
jp.setLayout(new GridLayout(3,2,10,10));
jp.add(lbl1);jp.add(txt);
jp.add(lbl2);jp.add(pf);
jp.add(btn1);jp.add(btn2);
btn1.addActionListener(this);
btn2.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getSource()==btn1)
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver")；
Connection con=DriverManager.getConnection("jdbc:odbc:MyDB","","");
Statement cmd=con.createStatement();
ResultSet rs=cmd.executeQuery("select * from loginAndpassword where login='"+txt.getText()+"' and password='"+pf.getText()+"'");
if(rs.next())
{
JOptionPane.showMessageDialog(null,"登陆成功！");
}
else
JOptionPane.showMessageDialog(null,"用户名或密码错误！");
} catch(Exception ex){}
if(ae.getSource()==btn2)
{
txt.setText("");
pf.setText("");
}
}
}
public static void main(String arg[])
{
JFrame.setDefaultLookAndFeelDecorated(true);
LoginFrm frm=new LoginFrm();
frm.setSize(400,200);
frm.setVisible(true);
}
}
