java 如何列出jar包中jar包里的所有文件和目录？

问题描述

如这样一个目录/Users/xxx/IdeaProjects/abc/web/target/web.jar!/BOOT-INF/lib/rest-0.0.1.jar!/com/tg/tiny/Users/xxx/IdeaProjects/abc/web/target/web.jar这个jar包下的文件目录可以这样得到

JarFile localJarFile = new JarFile(new File('/Users/xxx/IdeaProjects/abc/web/target/web.jar'));Enumeration<JarEntry> entries = localJarFile.entries();while (entries.hasMoreElements()) { JarEntry jarEntry = entries.nextElement(); System.out.println(jarEntry.getName());}

那么这个web.jar里的rest-0.0.1.jar下的文件目录如何得到？

问题解答

URL url = new URL('jar', null, 0, 'file:/Users/xxx/IdeaProjects/web/target/web.jar!/BOOT-INF/lib/rest.jar');URLConnection con = url.openConnection();if (con instanceof JarURLConnection) { JarURLConnection result = (JarURLConnection) con; JarInputStream jarInputStream = new JarInputStream(result.getInputStream()); JarEntry entry; while ((entry = jarInputStream.getNextJarEntry()) != null) {System.out.println(entry.getName()); }}回答2：

jar包是个文件。不是目录。需要通过classloader的getResourceAsStream()。

package edu.hxraid; import java.io.*; public class Resource { public void getResource() throws IOException{ //返回读取指定资源的输入流 InputStream is=this.getClass().getResourceAsStream('/resource/res.txt'); BufferedReader br=new BufferedReader(new InputStreamReader(is)); String s=''; while((s=br.readLine())!=null) System.out.println(s); } }

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