如何在内存中创建一个新的java.io.File? [英] How to create a new java.io.File in memory?

问题描述

如何在内存中而不是在硬盘上创建新的File(通过java.io)?

How can I create new File (from java.io) in memory, not on the hard disk?

我正在使用Java语言.我不想将文件保存在硬盘上.

I am using the Java language. I don't want to save the file on the hard drive.

我遇到了一个错误的API(java.util.jar.JarFile).期望String filename的File file.我没有文件(只有byte[]内容)，可以创建临时文件，但这不是一个漂亮的解决方案.我需要验证签名罐的摘要.

I'm faced with a bad API (java.util.jar.JarFile). It's expecting File file of String filename. I have no file (only byte[] content) and can create temporary file, but it's not beautiful solution. I need to validate the digest of a signed jar.

byte[] content = getContent();
File tempFile = File.createTempFile("tmp", ".tmp");
FileOutputStream fos = new FileOutputStream(tempFile);
fos.write(archiveContent);
JarFile jarFile = new JarFile(tempFile);
Manifest manifest = jarFile.getManifest();

在不创建临时文件的情况下获得清单的任何示例都将受到赞赏.

Any examples of how to achieve getting manifest without creating a temporary file would be appreciated.

推荐答案

要在内存中写入流，请使用:

To write to a stream, in memory, use:

new ByteArrayOutputStream();

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