[英]File list from classpath directory in running jar
我想從類路徑中加載所有資源包屬性,以便可以顯示支持的語言。 我從這里獲得了參考,並嘗試了第一種解決方案。 當我從Eclipse運行代碼時,它可以工作。 但是,當我創建可執行jar文件時,它無法讀取文件。 我不知道為什么從命令java -jar AppName.jar
運行時行為會有所不同
我的代碼是:
public static List<String> getResourceFiles(String path) throws IOException
{
List<String> filenames = new ArrayList<>();
InputStream in = getResourceAsStream(path);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
System.out.println("br = " + br.readLine());
String resource;
while ((resource = br.readLine()) != null)
{
filenames.add(resource);
}
return filenames;
}
private static InputStream getResourceAsStream(String resource)
{
final InputStream in = getContextClassLoader().getResourceAsStream(resource);
System.out.println("input stream = " + in);
return in == null ? FileUtil.class.getResourceAsStream(resource) : in;
}
private static ClassLoader getContextClassLoader()
{
return Thread.currentThread().getContextClassLoader();
}
在這里,我注意到從命令運行時InputStream為null,但是從Eclipse運行時InputStream不為null。
如何解決此問題,以便從命令運行時也可以讀取資源文件?
我找到了解決方案。 下面的代碼為我工作:
public static String[] getResourceListing(Class clazz, String path) throws URISyntaxException, IOException
{
URL dirURL = clazz.getClassLoader().getResource(path);
if (dirURL != null && dirURL.getProtocol().equals("file"))
{
/* A file path: easy enough */
return new File(dirURL.toURI()).list();
}
if (dirURL == null)
{
/*
* In case of a jar file, we can't actually find a directory. Have to assume the
* same jar as clazz.
*/
String me = clazz.getName().replace(".", "/") + ".class";
dirURL = clazz.getClassLoader().getResource(me);
}
if (dirURL.getProtocol().equals("jar"))
{
/* A JAR path */
String jarPath = dirURL.getPath().substring(5, dirURL.getPath().indexOf("!")); // strip out only the JAR file
JarFile jar = new JarFile(URLDecoder.decode(jarPath, "UTF-8"));
Enumeration<JarEntry> entries = jar.entries(); // gives ALL entries in jar
Set<String> result = new HashSet<String>(); // avoid duplicates in case it is a subdirectory
while (entries.hasMoreElements())
{
String name = entries.nextElement().getName();
if (name.startsWith(path))
{ // filter according to the path
String entry = name.substring(path.length());
int checkSubdir = entry.indexOf("/");
if (checkSubdir >= 0)
{
// if it is a subdirectory, we just return the directory name
entry = entry.substring(0, checkSubdir);
}
result.add(entry);
}
}
return result.toArray(new String[result.size()]);
}
throw new UnsupportedOperationException("Cannot list files for URL " + dirURL);
}
我認為您可以將應用程序路徑添加到系統環境(類路徑),如果無法解決問題,請在初始化文件流並修復它之前嘗試打印真實路徑。
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