我有一個包，其中包含 jar 文件中的文件列表。這個想法是找到包中的所有文件并讀取每個文件的內容。private static final String DATA_DIRECTORY = "this/is/my/package/containing/data/";try { URL url = this.getClass().getClassLoader().getResource(DATA_DIRECTORY); if (url.toExternalForm().startsWith("jar:")) { try (BufferedReader in = new BufferedReader( new InputStreamReader(this.getClass().getClassLoader().getResourceAsStream(DATA_DIRECTORY)))) { String inputLine; while ((inputLine = in.readLine()) != null) { System.out.println(inputLine); } } } else { try (BufferedReader in = new BufferedReader( new InputStreamReader(url.openStream()))) { String inputLine; while ((inputLine = in.readLine()) != null) { System.out.println(inputLine); } } } } catch (Exception e) { System.out.println(e); }窗口結果[Path] -> file:/D:/path/to/application/lib/my-jarfile.jar!/this/is/my/package/containing/data/[Files] ->b2bb2cbalc2bolpolqregrevstatLinux 結果[Path] -> jar:file:/path/to/application/lib/my-jarfile.jar!/this/is/my/package/containing/data/[Files] -> [][available bytes] -> 0在 Windows 中它工作得很好，但在 Linux 中卻失敗了，它顯示輸入流有 0 個可用字節，我想知道為什么。我嘗試了幾種解決方案，但似乎都沒有給我我想要的結果。我可能出什么問題或哪里出了問題？
1 回答
墨色風雨
TA貢獻1853條經驗 獲得超6個贊
因此，經過更多研究后，上述代碼只能在 Windows 的 IDE 中運行，但對于 jar 文件則失敗，因此我在 Linux 和 Windows 中得到的結果。
以下是我正在使用的工作解決方案。它可以以更簡潔的方式重寫，但由于時間原因，我保留了原樣。它適用于類路徑和 Jar 文件。
String directory = "/this/is/my/package/containing/data/";
請注意，包名稱目錄中需要開頭斜杠。
String path = ClassLoader.class.getResource(directory).toExternalForm();
if (path.startsWith("jar")) {
try {
URL url = new URL(path);
System.out.println("JAR URL Name : " + url.toString());
JarURLConnection connection = (JarURLConnection) url.openConnection();
String jarFileName = connection.getJarFile().getName();
System.out.println("JAR File Name : " + jarFileName);
try (JarInputStream jarFile = new JarInputStream(new FileInputStream(jarFileName));) {
String regex = directory.substring(1);
do {
try {
JarEntry jarEntry = jarFile.getNextJarEntry();
if (jarEntry != null) {
String entryName = jarEntry.getName();
if (!regex.equals(entryName) && entryName.contains(regex)) {
System.out.println("JAR Entry Name : " + entryName);
try (InputStream in = YourClassName.class.getClassLoader().getResourceAsStream(entryName);
Scanner scanner = new Scanner(in);) {
//Do something in here
} catch (Exception ex) {
System.out.println(ex);
}
}
} else {
break;
}
} catch (IOException ex) {
System.out.println("JAR InputStream Error : " + jarFileName + " - > " + ex);
break;
}
} while (true);
}
} catch (Exception e) {
System.out.println("JAR URL Connection Error : " + e);
}
} else {
try {
URL url = new URL(path);
try (BufferedReader in = new BufferedReader(
new InputStreamReader(url.openStream()))) {
String fileName;
while ((fileName = in.readLine()) != null) {
String filePath = directory + fileName;
try (InputStream is = ClassLoader.class.getResourceAsStream(filePath);
Scanner scanner = new Scanner(is);) {
//Do something here
} catch (Exception ex) {
System.out.println(ex);
}
}
}
} catch (Exception e) {
System.out.println("Classpath URL Connection Error : " + e);
}
}
}
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