我有一个包含jar文件中文件列表的软件包。想法是找到包中的所有文件并读取每个文件的内容。
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);
}
Windows结果
[Path] -> file:/D:/path/to/application/lib/my-jarfile.jar!/this/is/my/package/containing/data/
[Files] ->
b2b
b2c
bal
c2b
olp
olq
reg
rev
stat
Linux结果
[Path] -> jar:file:/path/to/application/lib/my-jarfile.jar!/this/is/my/package/containing/data/
[Files] -> []
[available bytes] -> 0
在Windows中,它工作正常,但是在Linux中,它失败了,它表明Inputstream有0字节可用,我想知道为什么。我尝试了几种解决方案,但似乎都没有给我想要的结果。我可能在哪里或哪里出错了?
因此,在进行了更多研究之后,以上代码仅在Windows的IDE中有效,但对于jar文件却失败了,因此我在Linux和Windows中都得到了结果。
下面是我正在使用的工作解决方案。可以用一种非常简洁的方式来重写它,但是由于时间的关系,我将其保持不变。它适用于IDE和Jar文件。
String directory = "/this/is/my/package/containing/data/";
请注意,在包名称目录中需要以斜杠开头。
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) && StringUtils.contains(entryName, regex)) {
System.out.println("JAR Entry Name : " + entryName);
try (InputStream in = this.getClass().getClassLoader().getResourceAsStream(entryName);
Scanner scanner = new Scanner(in);) {
StringBuilder builder = new StringBuilder();
Set<MpesaExecutorData> set = new HashSet();
while (scanner.hasNext()) {
builder.append(scanner.nextLine().trim());
}
JSONObject config = new JSONObject(builder.toString());
System.out.println("JAR Entry JSONObject : " + config.toString());
Iterator<String> keys = config.keys();
String fileName = StringUtils.remove(entryName, regex);
while (keys.hasNext()) {
String key = keys.next();
set.add(new MpesaExecutorData(key, config.getString(key)));
System.out.println(fileName + " : " + key + " => value : " + config.getString(key));
}
this.map.put(fileName, set);
} 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);) {
StringBuilder builder = new StringBuilder();
Set<MpesaExecutorData> set = new HashSet();
while (scanner.hasNext()) {
builder.append(scanner.nextLine().trim());
}
JSONObject config = new JSONObject(builder.toString());
System.out.println("Classpath Entry JSONObject : " + config.toString());
Iterator<String> keys = config.keys();
while (keys.hasNext()) {
String key = keys.next();
set.add(new MpesaExecutorData(key, config.getString(key)));
System.out.println("Classpath Entry key : " + key + " => value : " + config.getString(key));
}
this.map.put(fileName, set);
} catch (Exception ex) {
System.out.println(ex);
}
}
}
} catch (Exception e) {
System.out.println("Classpath URL Connection Error : " + e);
}
}
}