操作系统算法 之 文件系统设计

本程序模拟的是Linux操作系统的文件管理命令，图形化界面使用Swing。

File.java：文件类

FileManager.java：文件管理类

Editor.java：文本编辑器

Alert.java：弹窗

Main.java：程序入口

File.java

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public class File {private String name;private String content;public File() {}public File(String name) {this.name = name;}public File(String name, String content) {this.name = name;this.content = content;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}}

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FileManager.java

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import java.awt.EventQueue;import java.util.LinkedHashMap;import java.util.Map;public class FileManager {Map<String,File> files = new LinkedHashMap<String,File>();public void ls(){int count = 0;;for(File file : files.values()){if(count != 0){System.out.print("   ");}System.out.print(file.getName());count++;if(count == 5){count = 0;System.out.print("\n");}}if(count != 0){System.out.print("\n");}}public void touch(String fileName){if(files.containsKey(fileName)){throw new RuntimeException("该文件已存在！");}File file = new File(fileName);files.put(fileName, file);}public void vi(final String fileName){if(!files.containsKey(fileName)){File file = new File(fileName);files.put(fileName, file);}EventQueue.invokeLater(new Runnable() {public void run() {try {Editor frame = new Editor(files.get(fileName),files);frame.setVisible(true);} catch (Exception e) {e.printStackTrace();}}});}public void cat(String fileName){if(!files.containsKey(fileName)){throw new RuntimeException("该文件不存在！");}String content = files.get(fileName).getContent();if(content != null){System.out.print(files.get(fileName).getContent() + "\n");}}public void rm(String fileName){if(!files.containsKey(fileName)){throw new RuntimeException("该文件不存在！");}files.remove(fileName);}}

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Editor.java

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import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.LinkedHashMap;import java.util.Map;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.border.EmptyBorder;public class Editor extends JFrame {private JPanel contentPane;private JTextArea content;private Map<String,File> files = new LinkedHashMap<String,File>();private File file;public Editor(File file,Map<String,File> files) {this.file = file;this.files = files;setTitle(file.getName());setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setBounds(100, 100, 600, 400);contentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));contentPane.setLayout(new BorderLayout(0, 0));setContentPane(contentPane);JPanel panel = new JPanel();contentPane.add(panel, BorderLayout.NORTH);panel.setLayout(new BorderLayout(0, 0));JMenuBar menuBar = new JMenuBar();menuBar.setToolTipText("");panel.add(menuBar, BorderLayout.CENTER);JMenu mnNewMenu = new JMenu("文件");menuBar.add(mnNewMenu);JMenuItem mntmNewMenuItem_2 = new JMenuItem("保存");mntmNewMenuItem_2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {save();}});mnNewMenu.add(mntmNewMenuItem_2);JMenuItem mntmNewMenuItem = new JMenuItem("退出");mntmNewMenuItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {close();}});mnNewMenu.add(mntmNewMenuItem);content = new JTextArea();JScrollPane scrollPane = new JScrollPane(content);contentPane.add(scrollPane, BorderLayout.CENTER);content.setText(file.getContent());setLocationRelativeTo(null);}private void save(){files.get(file.getName()).setContent(content.getText());alert("保存成功！");}private void close(){this.setVisible(false);}private void alert(final String message){EventQueue.invokeLater(new Runnable() {public void run() {try {Alert frame = new Alert(message);frame.setVisible(true);} catch (Exception e) {e.printStackTrace();}}});}}

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Alert.java

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import java.awt.BorderLayout;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.JLabel;import javax.swing.SwingConstants;import java.awt.GridLayout;import javax.swing.JButton;import java.awt.Font;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;public class Alert extends JFrame {private JPanel contentPane;public Alert(String message) {setTitle("消息");setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setBounds(100, 100, 200, 150);contentPane = new JPanel();contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));setContentPane(contentPane);contentPane.setLayout(new GridLayout(2, 1, 0, 0));JPanel panel = new JPanel();contentPane.add(panel);panel.setLayout(new BorderLayout(0, 0));JLabel text = new JLabel("");text.setHorizontalAlignment(SwingConstants.CENTER);text.setFont(new Font("宋体", Font.PLAIN, 12));text.setText(message);panel.add(text, BorderLayout.CENTER);JPanel panel_1 = new JPanel();contentPane.add(panel_1);JButton btnNewButton = new JButton("关闭");btnNewButton.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {close();}});btnNewButton.setFont(new Font("宋体", Font.PLAIN, 20));panel_1.add(btnNewButton);setLocationRelativeTo(null);}private void close(){this.setVisible(false);}

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Main.java

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import java.util.Scanner;public class Main {public static void main(String[] args) {FileManager fm = new FileManager();Scanner s = new Scanner(System.in);while(true){try {System.out.print("cmd:");String cmd = s.next();switch(cmd){case "ls":{fm.ls();};break;case "touch":{fm.touch(s.next());};break;case "vi":{fm.vi(s.next());};break;case "cat":{fm.cat(s.next());};break;case "rm":{fm.rm(s.next());};break;default:{throw new RuntimeException("未知命令");}}} catch (Exception e) {System.out.print(e.getMessage() + "\n");}}}}

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