Java程序设计第十七周之图片的随机显示部分实现

import java.awt.EventQueue;
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.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;
public class Guess01 extends JFrame {
/**
*
*/
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
String strPath = "";    //+文件夹路径
String strFileName = "";    //+文件名称
JLabel jlbImg = null;
private int idImg = 1;
JLabel jlbImg1 = null;
JLabel jlbImg2 = null;
JLabel jlbImg3 = null;
/**
* Launch the application.
*/

public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Guess01 frame = new Guess01();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Guess01() {
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("\u9009\u62E9\u76EE\u5F55");
btnDir.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JFileChooser jfc=new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES );
jfc.showDialog(new JLabel(), "open");
File file=jfc.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("\u9009\u62E9\u73ED\u7EA7");
btnClass.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser jfc=new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES );
jfc.showDialog(new JLabel(), "open");
File file=jfc.getSelectedFile();
tfClass.setText(file.getAbsolutePath());

}
});
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("\u56FE\u72471");

lblImg1.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent arg0) {

}
});
lblImg1.setBounds(26, 21, 183, 190);
contentPane.add(lblImg1);
jlbImg1 = new JLabel();
jlbImg1.setBackground(Color.RED);
jlbImg1.setBounds(26, 151, 181,201);
this.add(jlbImg1);
// 标签，显示第二个学生相片
final JLabel lblImg2 = new JLabel("\u56FE\u72472");
lblImg2.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
}
});
lblImg2.setForeground(Color.BLACK);
lblImg2.setBackground(SystemColor.inactiveCaption);
lblImg2.setBounds(241, 21, 200, 190);
contentPane.add(lblImg2);
jlbImg2 = new JLabel();
jlbImg2.setBackground(Color.RED);
jlbImg2.setBounds(240, 155, 183, 201);
this.add(jlbImg2);
// 标签，显示第三个学生相片
final JLabel lblImg3 = new JLabel("\u56FE\u72473");
lblImg3.addMouseListener(new MouseAdapter() {

@Override
public void mouseClicked(MouseEvent e) {
}
});
lblImg3.setBounds(434,21, 200, 190);
contentPane.add(lblImg3);
jlbImg3 = new JLabel();
jlbImg3.setBackground(Color.RED);
jlbImg3.setBounds(434, 155, 185, 201);
this.add(jlbImg3);
// 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 btnGuessAgain = new JButton("\u518D\u731C\u4E00\u6B21");//利用按钮分别定义每一个标签的功能
btnGuessAgain.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(e.getSource()==btnGuessAgain ){
String strTmp = fileArray[index].toString();
index++;
if(index==NUM_IMG)
index = 0;
jlbImg1.setIcon(new ImageIcon(strTmp));
index++;
jlbImg2.setIcon(new ImageIcon(strTmp));
index++;
if(e.getSource()==btnGuessAgain ){
String strTmp2 = fileArray[index].toString();
index++;
jlbImg2.setIcon(new ImageIcon(strTmp2));
index++;
}

}   String strTmp1 = fileArray[index].toString();
index++;
jlbImg3.setIcon(new ImageIcon(strTmp1));
}
});
btnGuessAgain.setBounds(250, 337, 93, 35);
contentPane.add(btnGuessAgain);
}
public int getIdImg() {
return idImg;
}
public void setIdImg(int idImg) {
this.idImg = idImg;
}
}