Java小型操作系统模拟(采用策略模式结合反射进行搭建,支持一些简单的命令)

Java小型操作系统模拟

    • 项目说明
    • 第一阶段:反射结合策略模式搭建基本的命令结构
    • 第二阶段:注解结合反射与策略模式,将结构进一步规范
    • 第三阶段:开启新的窗口,将控制台输入切换到新窗口中,同时创建右键菜单,使效果贴近命令行
    • 第四阶段,发现IDEA的编译与命令行编译不一致且导致类装载出错的情况进行处理--重新编写初始化的装载方法
    • 第五阶段,解决打包为jar后的装载问题及采用脚本自动编译
    • 项目下载

项目说明

主要是为了学习Java反射的知识,以及对操作系统的一些概念进行回顾,搭建了一个小型的操作系统,包括基本的一些命令,如:clear、help、cd、mkdir、ls等;同时支持用户及角色创建,密码登录等,相关文件采用加密存储在本地;同时采用资源分配的形式设计了磁盘资源和内存资源,采用首次适应、循环首次适应、最佳适应、最坏适应等策略;采用Java的Socket通信设计了简单的socket通信模式

第一阶段:反射结合策略模式搭建基本的命令结构

采用配置文件的形式指定命令的名称、描述与对应类的全路径,采用反射的形式创建对象并装载到容器中;策略模式结合HashMap的形式,可以较为方便的获取到命令对象,并执行对应的策略方法。

策略模式的体现,采用Map进行命令策略的管理

package os.strategy;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * @author bbyh
 * @date 2023-07-27 21:19
 * @description
 */
public abstract class BaseStrategy {
    private static final Map<String, BaseStrategy> STRATEGY_FACTORY = new HashMap<>(4);
    private static final Map<String, String> STRATEGY_DOC = new HashMap<>(4);
    private final String name;
    private final String doc;

    public BaseStrategy(String name, String doc) {
        this.name = name;
        this.doc = doc;
    }

    protected final void register() {
        STRATEGY_FACTORY.put(name, this);
        STRATEGY_DOC.put(name, doc);
    }

    public abstract void execute();

    public static BaseStrategy getStrategy(String name) {
        if (!STRATEGY_FACTORY.containsKey(name)) {
            throw new UnsupportedOperationException("该策略还不支持");
        }
        return STRATEGY_FACTORY.get(name);
    }

    public static Set<String> getCommandNameSet() {
        return new HashSet<>(STRATEGY_FACTORY.keySet());
    }

    public static Map<String, String> getCommandDoc() {
        return new HashMap<>(STRATEGY_DOC);
    }
}

采用配置文件结合反射装载对象;分为只装载指定目录,或装载指定目录及其子目录,要求都是基础策略类的子类

package os.util;

import os.strategy.BaseStrategy;

import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashSet;
import java.util.Properties;

/**
 * @author bbyh
 * @date 2023/7/28 12:19
 */
public class OsApplication {
    private static final String PACKAGE_PREFIX = "src/";
    private static final String DEFAULT_STRATEGY_PACKAGE = "strategy.impl";
    private static final String OS_COMMAND_PROPERTIES = "os-command-config.properties";
    private static final HashSet<Class<?>> CLASS_SET = new HashSet<>(4);

    private static void load() {
        for (Class<?> instance : CLASS_SET) {
            if (instance.getSuperclass() == BaseStrategy.class) {
                try (InputStream inputStream = Files.newInputStream(Paths.get(OS_COMMAND_PROPERTIES))) {
                    Properties properties = new Properties();
                    properties.load(inputStream);
                    if (properties.containsKey(instance.getName())) {
                        String[] split = properties.getProperty(instance.getName()).split(",");
                        try {
                            Constructor<?> constructor = instance.getConstructor(String.class, String.class);
                            Object newInstance = constructor.newInstance(split[0], split[1]);
                            Method register = newInstance.getClass().getSuperclass().getDeclaredMethod("register");
                            register.setAccessible(true);
                            register.invoke(newInstance);
                        } catch (NoSuchMethodException | InvocationTargetException |
                                 IllegalAccessException | InstantiationException e) {
                            throw new RuntimeException(e);
                        }
                    }
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    public static void runWithSpecifiedDirectory(Class<?> application) {
        initSpecifiedDirectory(application.getPackage().getName() + "." + DEFAULT_STRATEGY_PACKAGE);
        load();
    }

    private static void initSpecifiedDirectory(String scanPackage) {
        File basePackage = new File(PACKAGE_PREFIX + scanPackage.replace(".", "/"));
        File[] files = basePackage.listFiles(file -> file.getName().endsWith(".java"));
        loadClasses(scanPackage, files);
    }

    private static void loadClasses(String scanPackage, File[] files) {
        if (files != null) {
            for (File file : files) {
                try {
                    Class<?> instance = Class.forName(scanPackage + "." + file.getName().replace(".java", ""));
                    CLASS_SET.add(instance);
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    public static void runWithRecursiveDirectory(Class<?> application) {
        initRecursiveDirectory(application.getPackage().getName());
        load();
    }

    private static void initRecursiveDirectory(String scanPackage) {
        File basePackage = new File(PACKAGE_PREFIX + scanPackage.replace(".", "/"));
        File[] files = basePackage.listFiles(file -> {
            if (file.isDirectory()) {
                initRecursiveDirectory(scanPackage + "." + file.getName());
            }
            return file.getName().endsWith(".java");
        });
        loadClasses(scanPackage, files);
    }
}

配置文件

os.strategy.impl.ClearStrategy=clear,清屏命令,清空屏幕
os.strategy.impl.HelpStrategy=help,帮助命令,查看当前系统支持的命令

项目结构
Java小型操作系统模拟(采用策略模式结合反射进行搭建,支持一些简单的命令)_第1张图片

第二阶段:注解结合反射与策略模式,将结构进一步规范

采用类似SpringBoot的启动方式,自动装载指定目录下的命令类,采用注解的形式设置命令的名称与描述

采用注解设置启动装载包目录名,以及各个策略类的目录名称与相关说明

package os.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author bbyh
 * @date 2023/7/2 15:29
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface StrategyScan {
    String value() default "strategy.impl";
}

help命令,简单输出系统支持的命令和说明

package os.strategy.impl;

import os.annotation.StrategyAnnotation;
import os.annotation.StrategyDocAnnotation;
import os.strategy.BaseStrategy;

import java.util.Map;
import java.util.Set;

/**
 * @author bbyh
 * @date 2023-07-27 21:26
 * @description
 */
@StrategyAnnotation(commandName = "help")
@StrategyDocAnnotation(commandDoc = "帮助命令,查看当前系统支持的命令")
public class HelpStrategy extends BaseStrategy {
    public HelpStrategy(String name, String doc) {
        super(name, doc);
    }

    @Override
    public void execute() {
        System.out.println("系统支持的命令");
        Set<String> commandNameSet = BaseStrategy.getCommandNameSet();
        Map<String, String> commandDoc = BaseStrategy.getCommandDoc();
        for (String commandName : commandNameSet) {
            System.out.println(commandName + ":" + commandDoc.get(commandName));
        }
    }
}

同样加载指定目录下携带注解的策略子类,或者加载目录及其子目录的所有符合条件的类

package os.util;

import os.annotation.StrategyAnnotation;
import os.annotation.StrategyDocAnnotation;
import os.annotation.StrategyScan;
import os.strategy.BaseStrategy;

import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashSet;

/**
 * @author bbyh
 * @date 2023/7/28 12:19
 */
public class OsApplication {
    private static final String PACKAGE_PREFIX = "src/";
    private static final HashSet<Class<?>> CLASS_SET = new HashSet<>(4);

    private static void load() {
        for (Class<?> instance : CLASS_SET) {
            if (instance.getSuperclass() == BaseStrategy.class) {
                try {
                    StrategyAnnotation nameAnnotation = instance.getAnnotation(StrategyAnnotation.class);
                    StrategyDocAnnotation docAnnotation = instance.getAnnotation(StrategyDocAnnotation.class);
                    if (nameAnnotation != null && docAnnotation != null) {
                        Constructor<?> constructor = instance.getConstructor(String.class, String.class);
                        Object newInstance = constructor.newInstance(nameAnnotation.commandName(), docAnnotation.commandDoc());
                        Method register = newInstance.getClass().getSuperclass().getDeclaredMethod("register");
                        register.setAccessible(true);
                        register.invoke(newInstance);
                    }
                } catch (NoSuchMethodException | InvocationTargetException |
                         IllegalAccessException | InstantiationException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    /**
     * 加载配置目录下的添加了StrategyAnnotation注解的类
     *
     * @param application 启动类
     */
    public static void runWithSpecifiedDirectory(Class<?> application) {
        StrategyScan strategyScan = application.getAnnotation(StrategyScan.class);
        initSpecifiedDirectory(application.getPackage().getName() + "." + strategyScan.value());
        load();
    }

    private static void initSpecifiedDirectory(String scanPackage) {
        File basePackage = new File(PACKAGE_PREFIX + scanPackage.replace(".", "/"));
        File[] files = basePackage.listFiles(file -> file.getName().endsWith(".java"));
        loadClasses(scanPackage, files);
    }

    private static void loadClasses(String scanPackage, File[] files) {
        if (files != null) {
            for (File file : files) {
                try {
                    Class<?> instance = Class.forName(scanPackage + "." + file.getName().replace(".java", ""));
                    CLASS_SET.add(instance);
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    /**
     * 加载配置目录及其子目录下的添加了StrategyAnnotation注解的类
     *
     * @param application 启动类
     */
    public static void runWithRecursiveDirectory(Class<?> application) {
        initRecursiveDirectory(application.getPackage().getName());
        load();
    }

    private static void initRecursiveDirectory(String scanPackage) {
        File basePackage = new File(PACKAGE_PREFIX + scanPackage.replace(".", "/"));
        File[] files = basePackage.listFiles(file -> {
            if (file.isDirectory()) {
                initRecursiveDirectory(scanPackage + "." + file.getName());
            }
            return file.getName().endsWith(".java");
        });
        loadClasses(scanPackage, files);
    }
}

项目结构
Java小型操作系统模拟(采用策略模式结合反射进行搭建,支持一些简单的命令)_第2张图片

第三阶段:开启新的窗口,将控制台输入切换到新窗口中,同时创建右键菜单,使效果贴近命令行

经过测试发现,上面两个系统在初始化加载类时有一些小问题,因为在实际使用时都是执行class文件,而在IDEA里面的执行是以Java文件为路径的,需要进行一些简单的小修改,当前这个阶段主要以IDEA里面的运行为主,后面再对路径和初始化逻辑进行一些调整,来保证兼容性

主窗体

package os.util;

import os.strategy.BaseStrategy;

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.*;
import java.io.IOException;

/**
 * @author bbyh
 * @date 2023-07-29 15:51
 * @description
 */
public class MainFrame extends JFrame {
    public static final JLabel DISPLAY = new JLabel();
    private static final String DEFAULT_WORD_DIR = "C:\\root>";

    public MainFrame() {
        setTitle("BBYH OS System");
        setSize(1000, 600);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        JScrollPane scrollPane = new JScrollPane(DISPLAY);
        DISPLAY.setOpaque(true);
        DISPLAY.setBackground(Color.WHITE);

        setLayout(new GridLayout(1, 1));
        add(scrollPane);
        setVisible(true);

        Font font = new Font("Consolos", Font.PLAIN, 24);
        DISPLAY.setFont(font);
        DISPLAY.setVerticalAlignment(SwingConstants.TOP);
        DISPLAY.setFocusable(true);
        init();

        // 右键菜单
        JPopupMenu rightMenu = new JPopupMenu();
        JMenuItem backgroundItem = new JMenuItem();
        JMenuItem fontItem = new JMenuItem();
        JMenuItem copyItem = new JMenuItem();

        backgroundItem.setFont(font);
        fontItem.setFont(font);
        copyItem.setFont(font);
        backgroundItem.setText("设置背景颜色");
        fontItem.setText("设置字体颜色");
        copyItem.setText("复制剪切版内容");

        rightMenu.add(backgroundItem);
        rightMenu.add(fontItem);
        rightMenu.add(copyItem);

        backgroundItem.addActionListener(evt -> {
            Color color = JColorChooser.showDialog(null, "设置背景颜色", Color.WHITE);
            if (color != null) {
                DISPLAY.setBackground(color);
            }
        });
        fontItem.addActionListener(evt -> {
            Color color = JColorChooser.showDialog(null, "设置字体颜色", Color.BLACK);
            if (color != null) {
                DISPLAY.setForeground(color);
            }
        });
        copyItem.addActionListener(evt -> {
            Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
            Transferable transferable = clipboard.getContents(null);
            if (transferable != null) {
                if (transferable.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                    try {
                        String data = (String) clipboard.getData(DataFlavor.stringFlavor);
                        appendDisplay(data);
                    } catch (UnsupportedFlavorException | IOException e) {
                        throw new RuntimeException(e);
                    }
                }
            }
        });

        DISPLAY.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                char keyChar = e.getKeyChar();
                if (keyChar == KeyEvent.VK_BACK_SPACE && !"".equals(getContent())) {
                    DISPLAY.setText(getContent().substring(0, getContent().length() - 1));
                    appendDisplay("");
                } else if (keyChar == KeyEvent.VK_ENTER) {
                    appendDisplay("
"
); try { BaseStrategy.getStrategy(Context.getNextCommand()).execute(); } catch (Exception ex) { appendDisplay(ex.getMessage() + "
"
); } appendDisplay(Context.getWorkDir()); } else if (Character.isLetterOrDigit(keyChar)) { appendDisplay(String.valueOf(keyChar)); } } }); DISPLAY.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { if (e.getButton() == MouseEvent.BUTTON3) { rightMenu.show(DISPLAY, e.getX(), e.getY() - 10); } } }); } private static void init() { Context.setWorkDir(DEFAULT_WORD_DIR); appendDisplay(DEFAULT_WORD_DIR); } public static void appendDisplay(String content) { DISPLAY.setText("" + getContent() + content + ""); } private static String getContent() { return DISPLAY.getText().replace("", "").replace("", ""); } }

Context上下文操作类

package os.util;

/**
 * @author bbyh
 * @date 2023-07-27 22:23
 * @description
 */
public class Context {
    private static String workDir;

    public static String getWorkDir() {
        return workDir;
    }

    public static void setWorkDir(String workDir) {
        Context.workDir = workDir;
    }

    public static String getNextCommand() {
        String text = MainFrame.DISPLAY.getText();
        return text.substring(text.lastIndexOf(getWorkDir()) + getWorkDir().length(), text.lastIndexOf("
"
)); } }

主程序

package os;

import os.annotation.StrategyScan;
import os.util.MainFrame;
import os.util.OsApplication;

/**
 * @author bbyh
 * @date 2023-07-27 21:18
 * @description
 */
@StrategyScan
public class Main {
    public static void main(String[] args) {
        OsApplication.runWithRecursiveDirectory(Main.class);
        new MainFrame();
    }
}

测试运行效果展示
Java小型操作系统模拟(采用策略模式结合反射进行搭建,支持一些简单的命令)_第3张图片

第四阶段,发现IDEA的编译与命令行编译不一致且导致类装载出错的情况进行处理–重新编写初始化的装载方法

采用getResource方法获取类路径,来装在class文件,同时采用脚本来解决javac命令行执行时无法编译不被别的文件依赖的策略实现类

重新编写的装载方法,采用递归装载,装载启动类目录下及其子目录中带有注解的策略实现类

package os.util;

import os.annotation.StrategyAnnotation;
import os.annotation.StrategyDocAnnotation;
import os.strategy.BaseStrategy;

import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Objects;

/**
 * @author bbyh
 * @date 2023/7/28 12:19
 */
public class OsApplication {
    private static final HashSet<Class<?>> CLASS_SET = new HashSet<>(4);
    private static String BASE_PATH;

    /**
     * 加载配置目录及其子目录下的添加了StrategyAnnotation注解的类
     *
     * @param application 启动类
     */
    public static void runWithRecursiveDirectory(Class<?> application) {
        BASE_PATH = Objects.requireNonNull(application.getResource("/")).getPath();
        initRecursiveDirectory(application.getPackage().getName());
        load();
    }

    private static void initRecursiveDirectory(String packageName) {
        File[] files = new File(BASE_PATH + packageName.replace(".", System.getProperty("file.separator"))).listFiles(file -> {
            if (file.isDirectory()) {
                initRecursiveDirectory(packageName + "." + file.getName());
            }
            return file.getName().endsWith(".class");
        });
        loadClasses(packageName, files);
    }

    private static void load() {
        for (Class<?> instance : CLASS_SET) {
            if (instance.getSuperclass() == BaseStrategy.class) {
                try {
                    StrategyAnnotation nameAnnotation = instance.getAnnotation(StrategyAnnotation.class);
                    StrategyDocAnnotation docAnnotation = instance.getAnnotation(StrategyDocAnnotation.class);
                    if (nameAnnotation != null && docAnnotation != null) {
                        Constructor<?> constructor = instance.getConstructor(String.class, String.class);
                        Object newInstance = constructor.newInstance(nameAnnotation.commandName(), docAnnotation.commandDoc());
                        Method register = newInstance.getClass().getSuperclass().getDeclaredMethod("register");
                        register.setAccessible(true);
                        register.invoke(newInstance);
                    }
                } catch (NoSuchMethodException | InvocationTargetException |
                         IllegalAccessException | InstantiationException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    private static void loadClasses(String packageName, File[] files) {
        if (files != null) {
            for (File file : files) {
                try {
                    Class<?> instance = Class.forName(packageName + "." + file.getName().replace(".class", ""));
                    CLASS_SET.add(instance);
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}

需要注意的一点是,目前采用getResource方法对于打包为jar包时则会报空指针错误,后续将考虑采用新方法装载来解决该问题

第五阶段,解决打包为jar后的装载问题及采用脚本自动编译

自动编译的脚本,Windows

mkdir out
cd src
javac -d ../out os/Main.java os/strategy/impl/*.java -encoding UTF-8

cd ../out

java os.Main

自动编译的脚本,Linux

#!/bin/bash
mkdir out
cd src
javac -d ../out os/Main.java os/strategy/impl/*.java -encoding UTF-8
cd ../out
java os.Main

需要注意几点小问题,脚本.sh需要在Linux下创建使用,同时需要给它赋予x执行权限(chmod +x javac_os_java.sh);然后在执行时还需要对XShell安装一下图形服务x11,参考文章:xshell-linux 启动 jmeter 报 No X11 DISPLAY variable was set, but this program performed …;不过这个Xming对中文的显示有问题,有点难办

主函数(根据启动不一样采用不一样的装载策略)

package os;

import os.annotation.StrategyScan;
import os.util.MainFrame;
import os.util.OsApplication;

import java.util.Objects;

/**
 * @author bbyh
 * @date 2023-07-27 21:18
 * @description
 */
@StrategyScan
public class Main {
    public static boolean applicationRunning = true;
    private static final String FILE_PROTOCOL = "file";
    private static final String JAR_PROTOCOL = "jar";

    public static void main(String[] args) {
        String protocol = Objects.requireNonNull(OsApplication.class.getResource("")).getProtocol();
        if (Objects.equals(protocol, FILE_PROTOCOL)) {
            OsApplication.runWithRecursiveDirectory(Main.class);
        } else if (Objects.equals(protocol, JAR_PROTOCOL)) {
            OsApplication.runWithRecursiveJar(Main.class);
        }
        new MainFrame();
    }
}

装载工具类

package os.util;

import os.annotation.StrategyAnnotation;
import os.annotation.StrategyDocAnnotation;
import os.strategy.BaseStrategy;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Objects;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * @author bbyh
 * @date 2023/7/28 12:19
 */
public class OsApplication {
    private static final HashSet<Class<?>> CLASS_SET = new HashSet<>(4);
    private static String BASE_PATH;
    public static final String FILE_SEPARATOR = "/";
    private static final String PREFIX_FILE = "file:";
    private static final String PREFIX_JAR = "jar:file:";
    private static final String SUFFIX_CLASS = ".class";

    /**
     * 加载配置目录及其子目录下的添加了StrategyAnnotation注解的类
     *
     * @param application 启动类
     */
    public static void runWithRecursiveDirectory(Class<?> application) {
        BASE_PATH = Objects.requireNonNull(application.getResource("")).toString().replace(PREFIX_FILE, "");
        String packageName = application.getPackage().getName();
        BASE_PATH = BASE_PATH.substring(0, BASE_PATH.lastIndexOf("/" + packageName + "/")) + FILE_SEPARATOR;
        initRecursiveDirectory(packageName);
        load();
    }

    private static void initRecursiveDirectory(String packageName) {
        File[] files = new File(BASE_PATH + packageName.replace(".", FILE_SEPARATOR)).listFiles(file -> {
            if (file.isDirectory()) {
                initRecursiveDirectory(packageName + "." + file.getName());
            }
            return file.getName().endsWith(SUFFIX_CLASS);
        });
        loadFileClasses(packageName, files);
    }

    private static void loadFileClasses(String packageName, File[] files) {
        if (files != null) {
            for (File file : files) {
                try {
                    Class<?> instance = Class.forName(packageName + "." + file.getName().replace(SUFFIX_CLASS, ""));
                    CLASS_SET.add(instance);
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    private static void load() {
        for (Class<?> instance : CLASS_SET) {
            if (instance.getSuperclass() == BaseStrategy.class) {
                try {
                    StrategyAnnotation nameAnnotation = instance.getAnnotation(StrategyAnnotation.class);
                    StrategyDocAnnotation docAnnotation = instance.getAnnotation(StrategyDocAnnotation.class);
                    if (nameAnnotation != null && docAnnotation != null) {
                        Constructor<?> constructor = instance.getConstructor(String.class, String.class);
                        Object newInstance = constructor.newInstance(nameAnnotation.commandName().split(" ")[0], docAnnotation.commandDoc());
                        Method register = newInstance.getClass().getSuperclass().getDeclaredMethod("register");
                        register.setAccessible(true);
                        register.invoke(newInstance);
                    }
                } catch (NoSuchMethodException | InvocationTargetException |
                         IllegalAccessException | InstantiationException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }

    public static void runWithRecursiveJar(Class<?> application) {
        BASE_PATH = Objects.requireNonNull(application.getResource("")).toString().replace(PREFIX_JAR, "");
        BASE_PATH = BASE_PATH.substring(0, BASE_PATH.lastIndexOf("!/" + application.getPackage().getName() + "/")) + FILE_SEPARATOR;
        initRecursiveJar();
        load();
    }

    private static void initRecursiveJar() {
        try (JarFile jarFile = new JarFile(BASE_PATH)) {
            Enumeration<JarEntry> jarEntryEnumeration = jarFile.entries();
            while (jarEntryEnumeration.hasMoreElements()) {
                JarEntry jarEntry = jarEntryEnumeration.nextElement();
                if (jarEntry.getName().endsWith(SUFFIX_CLASS)) {
                    Class<?> instance = Class.forName(jarEntry.getName().replace(SUFFIX_CLASS, "").replace("/", "."));
                    CLASS_SET.add(instance);
                }
            }
        } catch (IOException | ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }

}

运行效果
Java小型操作系统模拟(采用策略模式结合反射进行搭建,支持一些简单的命令)_第4张图片

项目下载

Gitee链接–Java模拟操作系统

你可能感兴趣的:(Java基础知识,java,策略模式,开发语言)