列出当前 JAR 文件的目录中的文件 [英] Listing the files in a directory of the current JAR file

问题描述

我正在用 JAVA 制作一个游戏，我想在我的 jar 中的某个目录中提供一个文件列表，这样我就可以确保有一个要在游戏中使用的类的列表.

I am making a game in JAVA where I want to come up with a list of files in a certain directory in my jar so I can make sure to have a list of those classes to be used in the game.

例如在我的 jar 中说我有一个目录

For example say in my jar I have a directory

mtd/entity/creep/

我想获取该目录中所有 .class 文件的列表使用来自 jar 中另一个类的 java 代码.

I want to get a list of all the .class files in that directory using java code from another class in the jar.

这样做的最佳代码是什么?

What is the best code to do so?

推荐答案

旧的 java1.4 代码，但那会给你思路:

Old java1.4 code, but that would give you the idea:

private static List getClassesFromJARFile(String jar, String packageName) throws Error
{
    final List classes = new ArrayList();
    JarInputStream jarFile = null;
    try
    {
        jarFile = new JarInputStream(new FileInputStream(jar));
        JarEntry jarEntry;
        do 
        {       
            try
            {
                jarEntry = jarFile.getNextJarEntry();
            }
            catch(IOException ioe)
            {
                throw new CCException.Error("Unable to get next jar entry from jar file '"+jar+"'", ioe);
            }
            if (jarEntry != null) 
            {
                extractClassFromJar(jar, packageName, classes, jarEntry);
            }
        } while (jarEntry != null);
        closeJarFile(jarFile);
    }
    catch(IOException ioe)
    {
        throw new CCException.Error("Unable to get Jar input stream from '"+jar+"'", ioe);
    }
    finally
    {
        closeJarFile(jarFile);
    }
   return classes;
}
private static void extractClassFromJar(final String jar, final String packageName, final List classes, JarEntry jarEntry) throws Error
{
    String className = jarEntry.getName();
    if (className.endsWith(".class")) 
    {
        className = className.substring(0, className.length() - ".class".length());
        if (className.startsWith(packageName))
        {
            try
            {
                classes.add(Class.forName(className.replace('/', '.')));
            } catch (ClassNotFoundException cnfe)
            {
                throw new CCException.Error("unable to find class named " + className.replace('/', '.') + "' within jar '" + jar + "'", cnfe);
            }
        }
    }
}
private static void closeJarFile(final JarInputStream jarFile)
{
    if(jarFile != null) 
    { 
        try
        {
            jarFile.close(); 
        }
        catch(IOException ioe)
        {
            mockAction();
        }
    }
}

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