如何将jar文件复制到jar外面？ [英] How to copy file inside jar to outside the jar?

问题描述

我想从一个jar中复制一个文件。我要复制的文件将被复制到工作目录之外。我已经做了一些测试，所有的方法我尝试结束了0字节文件。

I want to copy a file from a jar. The file that I am copying is going to be copied outside the working directory. I have done some tests and all methods I try end up with 0 byte files.

EDIT ：我想复制文件

推荐答案

首先我想说的是，之前发布的一些答案是完全正确的，但我想给我的，因为有时我们不能使用GPL下的开源库，或者因为我们太懒得下载jar XD或什么你的原因是在这里是一个独立的解决方案。

First of all I want to say that some of the answers posted before are entirely correct, but I want to give mine, since sometimes we can't use open source libraries under the GPL, or because we are too lazy to download the jar XD or what ever your reason is here is a standalone solution.

下面的函数复制了Jar文件旁边的资源：

The function below copy the resource beside the Jar file:

  /**
     * Export a resource embedded into a Jar file to the local file path.
     *
     * @param resourceName ie.: "/SmartLibrary.dll"
     * @return The path to the exported resource
     * @throws Exception
     */
    static public String ExportResource(String resourceName) throws Exception {
        InputStream stream = null;
        OutputStream resStreamOut = null;
        String jarFolder;
        try {
            stream = ExecutingClass.class.getResourceAsStream(resourceName);//note that each / is a directory down in the "jar tree" been the jar the root of the tree
            if(stream == null) {
                throw new Exception("Cannot get resource \"" + resourceName + "\" from Jar file.");
            }

            int readBytes;
            byte[] buffer = new byte[4096];
            jarFolder = new File(ExecutingClass.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()).getParentFile().getPath().replace('\\', '/');
            resStreamOut = new FileOutputStream(jarFolder + resourceName);
            while ((readBytes = stream.read(buffer)) > 0) {
                resStreamOut.write(buffer, 0, readBytes);
            }
        } catch (Exception ex) {
            throw ex;
        } finally {
            stream.close();
            resStreamOut.close();
        }

        return jarFolder + resourceName;
    }

只需将ExecutingClass更改为类的名称，

Just change ExecutingClass to the name of your class, and call it like this:

String fullPath = ExportResource("/myresource.ext");

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