我有一个名为“的 Jar 文件外部Jar.jar“其中包含另一个名为”的罐子内Jar.jar“此 InnerJar 包含 2 个名为“的文件测试1.类“&”测试2.类“。现在我想提取这两个文件。我尝试了一些代码，但它不起作用。
class NestedJarExtractFactory{
public void nestedJarExtractor(String path){
JarFile jarFile = new JarFile(path);
Enumeration entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry _entryName = (JarEntry) entries.nextElement();
if(temp_FileName.endsWith(".jar")){
JarInputStream innerJarFileInputStream=new JarInputStream(jarFile.getInputStream(jarFile.getEntry(temp_FileName)));
System.out.println("Name of InnerJar Class Files::"+innerJarFileInputStream.getNextEntry());
JarEntry innerJarEntryFileName=innerJarFileInputStream.getNextJarEntry();
///////////Now hear I need some way to get the Input stream of this class file.After getting inputStream i just get that class obj through
JavaClass clazz = new ClassParser(InputStreamOfFile,"" ).parse();
}
///// I use the syntax
JavaClass clazz = new ClassParser(jarFile.getInputStream(innerJarEntryFileName),"" ).parse();
但问题是“jarFile”obj 是 Outer Jar File 的对象，因此当尝试获取 InnerJar 中存在的文件的 inputStream 时是不可能的。
您需要创建第二个JarInputStream处理内部条目。
这就是你想要的：
FileInputStream fin = new FileInputStream("OuterJar.jar");
JarInputStream jin = new JarInputStream(fin);
ZipEntry ze = null;
while ((ze = jin.getNextEntry()) != null) {
if (ze.getName().endsWith(".jar")) {
JarInputStream jin2 = new JarInputStream(jin);
ZipEntry ze2 = null;
while ((ze2 = jin2.getNextEntry()) != null) {
// this is bit of a hack to avoid stream closing,
// since you can't get one for the inner entry
// because you have no JarFile to get it from
FilterInputStream in = new FilterInputStream(jin2) {
public void close() throws IOException {
// ignore the close
}
};
// now you can process the input stream as needed
JavaClass clazz = new ClassParser(in, "").parse();
}
}
}
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