十四周总结

  1 package demo01;
  2 
  3 import java.awt.Font;
  4 import java.awt.event.ActionEvent;
  5 import java.awt.event.ActionListener;
  6 import java.io.File;
  7 import java.io.FileInputStream;
  8 import java.io.FileNotFoundException;
  9 import java.io.FileOutputStream;
 10 import java.io.PrintStream;
 11 import java.util.Scanner;
 12 
 13 import javax.swing.JFileChooser;
 14 import javax.swing.JFrame;
 15 import javax.swing.JLabel;
 16 import javax.swing.JMenu;
 17 import javax.swing.JMenuBar;
 18 import javax.swing.JMenuItem;
 19 import javax.swing.JScrollPane;
 20 import javax.swing.JTextArea;
 21 import javax.swing.KeyStroke;
 22 
 23 public class Test {
 24 
 25     public Test() {
 26 
 27         final JFrame j = new JFrame("记事本");
 28 
 29         final JTextArea text = new JTextArea();
 30         text.setEditable(true);
 31         j.getContentPane().add(new JScrollPane(text));
 32         // 设置菜单栏
 33         JMenu menuFile = new JMenu("文件");
 34         JMenuBar menuBar = new JMenuBar();
 35         menuBar.add(menuFile);
 36         j.setJMenuBar(menuBar);
 37 
 38         JMenu help = new JMenu("帮助");
 39         JMenuBar menuBar2 = new JMenuBar();
 40         menuBar.add(help);
 41         j.setJMenuBar(menuBar);
 42         // 设置菜单项
 43 
 44         JMenuItem newItem = new JMenuItem("新建(N)");
 45         menuFile.add(newItem);
 46         newItem.setMnemonic(‘N‘);
 47         newItem.setAccelerator(KeyStroke.getKeyStroke(‘N‘,
 48                 java.awt.Event.CTRL_MASK));
 49 
 50         JMenuItem openItem = new JMenuItem("打开(O)");
 51         menuFile.add(openItem);
 52         openItem.setMnemonic(‘O‘);
 53         openItem.setAccelerator(KeyStroke.getKeyStroke(‘O‘,
 54                 java.awt.Event.CTRL_MASK));
 55 
 56         JMenuItem saveItem = new JMenuItem("保存(S)");
 57         menuFile.add(saveItem);
 58         saveItem.setMnemonic(‘S‘);
 59         saveItem.setAccelerator(KeyStroke.getKeyStroke(‘S‘,
 60                 java.awt.Event.CTRL_MASK));
 61 
 62         JMenuItem saveToItem = new JMenuItem("另存为.. ");
 63         menuFile.add(saveToItem);
 64 
 65         menuFile.addSeparator();
 66 
 67         JMenuItem closeItem = new JMenuItem("退出(X)");
 68         menuFile.add(closeItem);
 69         closeItem.setMnemonic(‘X‘);
 70 
 71         JMenuItem aboutItem = new JMenuItem("关于记事本(A)");
 72         help.add(aboutItem);
 73         aboutItem.setMnemonic(‘A‘);
 74 
 75         // 事件监听
 76         newItem.addActionListener(new ActionListener() {
 77             @Override
 78             public void actionPerformed(ActionEvent e) {
 79                 text.setText("");
 80             }
 81         });
 82         openItem.addActionListener(new ActionListener() {
 83             @Override
 84             public void actionPerformed(ActionEvent e) {
 85                 File file = null;
 86                 int result = 0;
 87                 JFileChooser filechooser = new JFileChooser();
 88                 text.setText("");
 89                 filechooser.setApproveButtonText("确定");
 90                 filechooser.setDialogTitle("打开文件");
 91                 result = filechooser.showOpenDialog(j);// 显示打开文件窗口
 92                 if (result == JFileChooser.APPROVE_OPTION) {// 确定
 93                     file = filechooser.getSelectedFile();// 得到选择的文件对象
 94                 }
 95                 if (file != null) {
 96                     try {
 97                         Scanner sc = new Scanner(new FileInputStream(file));
 98                         sc.useDelimiter("\n");
 99                         while (sc.hasNext()) {
100                             text.append(sc.next());
101                         }
102                     } catch (FileNotFoundException e1) {
103                         e1.printStackTrace();
104                     }
105                 }
106 
107             }
108         });
109         saveItem.addActionListener(new ActionListener() {
110             @Override
111             public void actionPerformed(ActionEvent e) {
112                 File file = null;
113                 int result = 0;
114                 JFileChooser filechooser = new JFileChooser();
115                 filechooser.setApproveButtonText("确定");
116                 filechooser.setDialogTitle("保存文件");
117                 result = filechooser.showSaveDialog(j);// 显示保存文件窗口
118                 if (result == JFileChooser.APPROVE_OPTION) {// 确定
119                     file = filechooser.getSelectedFile();// 得到选择的文件对象
120                 }
121                 if (file != null) {
122                     try {
123                         PrintStream out = new PrintStream(new FileOutputStream(
124                                 file));
125                         out.print(text.getText());
126                         out.close();
127                     } catch (FileNotFoundException e1) {
128                         e1.printStackTrace();
129                     }
130                 }
131 
132             }
133         });
134         saveToItem.addActionListener(new ActionListener() {
135             @Override
136             public void actionPerformed(ActionEvent e) {
137 
138             }
139         });
140         closeItem.addActionListener(new ActionListener() {
141             @Override
142             public void actionPerformed(ActionEvent e) {
143                 System.exit(0);
144             }
145         });
146         aboutItem.addActionListener(new ActionListener() {
147             @Override
148             public void actionPerformed(ActionEvent e) {
149                 JFrame j1 = new JFrame("关于记事本");
150                 JLabel lab=new JLabel("developer:zyz",JLabel.CENTER);
151                 Font font=new Font("arial",Font.ITALIC+Font.BOLD,28);
152                 lab.setFont(font);
153                 j1.add(lab);
154                 j1.setSize(300, 200);
155                 j1.setLocation(350,350);
156                 j1.setResizable(false);
157                 j1.setVisible(true);
158                 
159             }
160         });
161 
162         j.setSize(400, 300);
163         j.setLocation(300, 300);
164         j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
165         j.setVisible(true);
166 
167     }
168 
169 }

package demo01;

public class Main {

    public static void main(String[] args) {
        
        Test t=new Test();

    }

}