Java：訪問嵌入式jar文件中的文件

Question

我有一個名為“ jar1.jar”的jar文件。 在內部，它具有另一個名為“ jar2.jar”的jar文件。

“ jar2.jar”的內容是：“ file.txt”。

jar1.jar
|
|-> jar2.jar
    |
    |-> file.txt

我想獲取“ file.txt”的內容。

我的代碼如下：

try{
    String secondJarPath=Myclass.class.getResource("jar2.jar").getPath();

    //An exception is thrown
    JarFile secondJar = new JarFile(secondJarPath);

    JarEntry entry =secondJar.getJarEntry("file.txt");
    InputStream inputStream = entry.getInputStream(entry);
    String content= IOUtils.toString(inputStream, Charset.forName("UTF-8"));

}
catch(IOException e){
}

但是，在“ JarFile secondJar = new JarFile（secondJarPath）;”行中引發異常，說“文件名，目錄名或卷標簽語法不正確”

誰能幫我 ？

謝謝

Answer 1

try{
   String firstJarPath = Junk.class.getResource("jar1.jar").getPath();
    JarFile firstJar = new JarFile(firstJarPath);
    JarEntry entry = firstJar.getJarEntry("jar2.jar");

    InputStream isJar2 = firstJar.getInputStream(entry);
    JarInputStream jisJar2 = new JarInputStream(isJar2);
    JarEntry textFileEntry = jisJar2.getNextJarEntry();

    if (textFileEntry.isDirectory()) {
        jisJar2.close();
        firstJar.close();
        throw new Exception("didn't expect a directory");
    } else {
        int size = (int) textFileEntry.getSize();
        if (size <= 0) {
            System.out.print("ignore entry " + textFileEntry.getName() + " as size=" + size);
        } else {
            byte[] fileBytes = new byte[size];
            IOUtils.read(jisJar2, fileBytes, 0, size);
            ByteArrayInputStream ibs = new ByteArrayInputStream(fileBytes);
            // ibs should be your file, so now do something with it....
        }
    }
    jisJar2.close();
    firstJar.close();

}

catch(IOException e){
}