实训猜猜看——进度1

import java.awt.EventQueue;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JTextField;
import javax.swing.JLabel;
import java.awt.Color;
import java.awt.Image;
import java.awt.SystemColor;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.Random;
public class guess02 extends JFrame {
/**
*
*/
class myFileFilter implements FileFilter{
@Override
public boolean accept(File pathname) {
String filename = pathname.getName().toLowerCase();
if(filename.contains(".jpg")){
return false;
}else{
return true;
}
}
}
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTextField tfDir;
private JTextField tfClass;
File[] fileArray;   // 文件夹下所有文件
int NUM_IMG = 0;    // 文件总数目
int index   = 0;    // 当前文件的序号
JLabel jlbImg = null;
JButton btnNext = null;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
guess02 frame = new guess02();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public guess02() {
setTitle("\u731C\u731C\u770B\u6E38\u620FV0.1");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 645, 409);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

// 选择目录 按钮的处理程序
JButton btnDir = new JButton("目录");
btnDir.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser j=new JFileChooser();
j.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
j.showDialog(new JLabel(), "选择目录");
File file=j.getSelectedFile();
tfDir.setText(file.getAbsolutePath());
if((file!=null && file.isDirectory())){
// 获取文件夹下所有的文件
fileArray = file.listFiles();
NUM_IMG = fileArray.length;
}
}
});
btnDir.setBounds(26, 26, 93, 23);
contentPane.add(btnDir);
// 文本框，显示目录
tfDir = new JTextField();
tfDir.setEditable(false);
tfDir.setBounds(125, 27, 363, 21);
contentPane.add(tfDir);
tfDir.setColumns(10);

// 选择班级 按钮的处理程序
JButton btnClass = new JButton("班级");
btnClass.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser i=new JFileChooser();
i.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
i.showDialog(new JLabel(), "选择班级");
File file=i.getSelectedFile();
tfClass.setText(file.getAbsolutePath());
fileArray = file.listFiles();
NUM_IMG = fileArray.length;
}
});
btnClass.setBounds(26, 59, 93, 23);
contentPane.add(btnClass);

// 文本框，显示班级文件
tfClass = new JTextField();
tfClass.setEditable(false);
tfClass.setBounds(125, 60, 363, 21);
contentPane.add(tfClass);
tfClass.setColumns(10);

// 标签，显示带猜测学生姓名
JLabel lbGuessName = new JLabel("\u59D3\u540D");
lbGuessName.setBounds(259, 91, 102, 23);
contentPane.add(lbGuessName);

// 标签，显示第一个学生相片
final JLabel lblImg1 = new JLabel("");

setBackground(Color.RED);
lblImg1.setBounds(100, 100, 200, 200);
this.add(lblImg1);

lblImg1.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent arg0) {
}
});
lblImg1.setBounds(26, 151, 183, 178);
contentPane.add(lblImg1);

// 标签，显示第二个学生相片
final JLabel lblImg2 = new JLabel("");
lblImg2.setBackground(Color.RED);
lblImg2.setBounds(100, 100, 200, 200);
this.add(lblImg2);
lblImg2.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
}
});
lblImg2.setForeground(Color.BLACK);
lblImg2.setBackground(SystemColor.inactiveCaption);
lblImg2.setBounds(241, 155, 183, 172);
contentPane.add(lblImg2);

// 标签，显示第三个学生相片
final JLabel lblImg3 = new JLabel("");
lblImg3.setBackground(Color.RED);
lblImg3.setBounds(100, 100, 200, 200);
this.add(lblImg3);
lblImg3.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
}
});
lblImg3.setBounds(434, 155, 185, 172);
contentPane.add(lblImg3);
// 再猜一次 按钮，点击则更新相应的三张图片 与 带猜测学生姓名
final JButton btnNext = new JButton("再猜一次");
btnNext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(e.getSource()==btnNext){ //如果是next按钮
//随机数
Random random = new Random(System.currentTimeMillis());
//循环三次
ImageIcon icon;//定义icon变量
for(int i=0;i<3;i++)
{
index = random.nextInt(NUM_IMG);
String strTmp = fileArray[index].toString();
try {
icon = new ImageIcon(ImageIO.read(new File(strTmp)));
Image image = icon.getImage(); // 从图表中获取到图片
Image smallImage = image.getScaledInstance(150,200,Image.SCALE_FAST);// 缩放图像
icon = new ImageIcon(smallImage);//把Image文件转化为ImageIcon
if(index==NUM_IMG)
index = 0;
switch(i)
{
case 0:
lblImg1.setIcon(icon);
break;
case 1:
lblImg2.setIcon(icon);
break;
case 2:
lblImg3.setIcon(icon);
break;
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}
});
btnNext.setBounds(223, 337, 93, 23);
contentPane.add(btnNext);
}
}