如何在 Java 中制作不包含绝对路径名的 Zip/Jar

Question

我正在用 Java 生成一个 .jar 文件，但 .jar 包含它在系统中的绝对路径名（/tmp/tempXXX/foo 而不是 /foo）。 树是这样的：

.
|-- META-INF
|-|- ....
|-- tmp
|-|- tempXXX
|-|-|- foo
|-|-|- bar

而不是这样：

.
|-- META-INF
|-|- ....
|-- foo
|-- bar

可以解决这个问题吗？下面是实现它的函数：

public static void add(File source, JarOutputStream target, String removeme)
        throws IOException
{
    BufferedInputStream in = null;
    try
    {
        File source2 = source;
        if (source.isDirectory())
        {
            String name = source2.getPath().replace("\\", "/");
            if (!name.isEmpty())
            {
                if (!name.endsWith("/"))
                    name += "/";
                JarEntry entry = new JarEntry(name);
                entry.setTime(source.lastModified());
                target.putNextEntry(entry);
                target.closeEntry();
            }
            for (File nestedFile : source.listFiles())
                add(nestedFile, target, removeme);
            return;
        }

        JarEntry entry = new JarEntry(source2.getPath().replace("\\", "/"));
        entry.setTime(source.lastModified());
        target.putNextEntry(entry);
        in = new BufferedInputStream(new FileInputStream(source));

        byte[] buffer = new byte[2048];
        while (true)
        {
            int count = in.read(buffer);
            if (count == -1)
                break;
            target.write(buffer, 0, count);
        }
        target.closeEntry();
    }
    finally
    {
        if (in != null)
            in.close();
    }
}

source2 变量是为了修改路径而创建的，但是在修改时，它给出了“无效的 .jar 文件”错误。 修改是这样的：

File source2 = new File(source.getPath().replaceAll("^" + removeme, ""));

编辑：它现在可以工作了。如果有人感兴趣的话，这是新代码：

public static void add(File source, JarOutputStream target, String removeme)
        throws IOException
{
    BufferedInputStream in = null;
    try
    {
        File parentDir = new File(removeme);
        File source2 = new File(source.getCanonicalPath().substring(
                parentDir.getCanonicalPath().length() + 1,
                source.getCanonicalPath().length()));
        if (source.isDirectory())
        {
            String name = source2.getPath().replace("\\", "/");
            if (!name.isEmpty())
            {
                if (!name.endsWith("/"))
                    name += "/";
                JarEntry entry = new JarEntry(name);
                entry.setTime(source.lastModified());
                target.putNextEntry(entry);
                target.closeEntry();
            }
            for (File nestedFile : source.listFiles())
                add(nestedFile, target, removeme);
            return;
        }

        JarEntry entry = new JarEntry(source2.getPath().replace("\\", "/"));
        entry.setTime(source.lastModified());
        target.putNextEntry(entry);
        in = new BufferedInputStream(new FileInputStream(source));

        byte[] buffer = new byte[2048];
        while (true)
        {
            int count = in.read(buffer);
            if (count == -1)
                break;
            target.write(buffer, 0, count);
        }
        target.closeEntry();
    }
    finally
    {
        if (in != null)
            in.close();
    }
}

Answer 1

要获取相对路径，您必须在调用 JarEntry(name) 时提供相对路径。尝试删除直到父目录的路径部分。所以那就是这样的，

File parentDir = "src";//dir from which you want the relative path

String relPath = source.getCanonicalPath()
                  .substring(parentDir.getCanonicalPath().length() + 1,
                             source.getCanonicalPath().length());

JarEntry entry = new JarEntry(relPath.replace(("\\", "/"));
...