Search and extract a file from jar. Java

Question

I get jar files from net. I've been able to open it and to search for a file(.txt file) that I need inside it. For doing that I am using JarEntry and method getNextJarEntry(). Finally when I identify the file I need I would like to save it in some directory on my disc. I don't know how to do this. The object I have after file identification is JarEntry which corresponds to the file I want to save. Can anybody suggest me a way how to store the file I need?

My bad, I only have JarInputStream and not the jar itself.

Answer 1

在原始的JarFile对象上，您可以传递JarEntry并获取InputStream ：

 InputStream    getInputStream(ZipEntry ze) 

Answer 2

使用JarFile.getInputStream(ZipEntry)方法，从输入流中读取所有字节，然后将它们写入FileOutputStream。

Answer 3

您可以使用自定义类加载器（ java.net.URLClassloader ）加载JAR，然后使用getResourceAsStream获取资源。