Question

我正在尝试从我的插件中内置的包的内容填充目录。当bundle是文件系统时，以下代码有效，但当bundle是JAR时失败。

测试URL是否是目录的最佳方法是什么？或者是否有一种完全不同的，更好的方法来从资源包创建文件结构？

    static private void bundleCopy(String dir, String destination) throws IOException {
    Bundle bundle = com.mds.apg.Activator.getDefault().getBundle();

    for (@SuppressWarnings("unchecked")
        Enumeration<URL> en = (Enumeration<URL>) bundle.findEntries(dir, "*", true); 
            en.hasMoreElements();) {
        URL url = en.nextElement();
        String toFileName = destination + url.getPath().substring(dir.length());
        File toFile = new File(toFileName);
        InputStream in;

        try {
            in = url.openStream();
        } catch (FileNotFoundException e) {
            // this exception get thrown for file system directories but not for jar file ones
            if (!toFile.mkdir()) {
                throw new IOException("bundleCopy: " + "directory Creation Failed: "
                        + toFileName);
            }
            continue;
        }
        FileCopy.coreStreamCopy(in, toFile);
    }
}

Answer 1

我找到了答案：

关键是目录的Enumeration条目以'/'结尾。

以下正确区分JAR和文件系统的目录和文件：

    static private void bundleCopy(String dir, String destination) 
    throws IOException, URISyntaxException {

    Bundle bundle = com.mds.apg.Activator.getDefault().getBundle();
    Enumeration<URL> en = bundle.findEntries(dir, "*", true);
    while (en.hasMoreElements()) {
        URL url = en.nextElement();
        String pathFromBase = url.getPath().substring(dir.length()+1);
        String toFileName = destination + pathFromBase;
        File toFile = new File(toFileName);

        if (pathFromBase.lastIndexOf('/') == pathFromBase.length() - 1) {
            // This is a directory - create it and recurse
            if (!toFile.mkdir()) {
                throw new IOException("bundleCopy: " + "directory Creation Failed: " + toFileName);
            }
        } else {
            // This is a file - copy it
            FileCopy.coreStreamCopy(url.openStream(), toFile);
        }        
    }
}

Answer 2

您可以尝试使用new File(FileLocator.resolve(url).toUri())之类的东西将特定于Eclipse的URL转换为使用本机Java协议的URL。

如何测试Eclipse包中的URL是否是目录？

2 个答案: