JAR文件中的walkFileThree [英] walkFileThree inside JAR-file
本文介绍了JAR文件中的walkFileThree的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我无法在JAR文件中获取根路径.我正在编写一种使用Java NIO walkFileThree将Jar/Zip文件的内容提取到目标目录的方法.该方法当前如下所示:
I'm having trouble to get the root-path inside a JAR-file. I'm writing a method for extracting the content of a Jar/Zip-file to a target directory using Java NIO walkFileThree. The method currently looks like this:
public static void unzip(Path filePath, Path destination) throws IOException {
Map<String, String> zipProperties = new HashMap<>();
/* We want to read an existing ZIP File, so we set this to False */
zipProperties.put("create", "false");
zipProperties.put("encoding", "UTF-8");
URI zipFile = URI.create("jar:file:" + filePath.toUri().getPath());
try (FileSystem zipfs = FileSystems.newFileSystem(zipFile, zipProperties)) {
Path rootPath = zipfs.getPath("/");
Files.walkFileTree(rootPath, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
Path targetPath = destination.resolve(rootPath.relativize(dir));
if (!Files.exists(targetPath)) {
Files.createDirectory(targetPath);
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Files.copy(file, destination.resolve(rootPath.relativize(file)), StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING);
return FileVisitResult.CONTINUE;
}
});
}
}
但我得到一个例外:
java.nio.file.ProviderMismatchException
at sun.nio.fs.UnixPath.toUnixPath(UnixPath.java:200) ~[?:1.8.0_45]
at sun.nio.fs.UnixPath.resolve(UnixPath.java:397) ~[?:1.8.0_45]
at sun.nio.fs.UnixPath.resolve(UnixPath.java:43) ~[?:1.8.0_45]
获取zip文件的根路径(/)以便我可以将所有内容递归复制到目标文件夹的正确方法是什么?
What is the proper way to get the root-path(/) of the zip file so that I could recursively copy all the content to the destination folder?
谢谢!
推荐答案
要使其正常运行,只需按照以下建议在relativize()之后添加toString()即可:
Got it working, just added a toString() after relativize() as suggested here: FileSystemNotFoundException
现在,工作代码如下:
public static void unzip(Path filePath, Path destination) throws IOException {
//Path filePath = Paths.get( zipFilePath );
Map<String, String> zipProperties = new HashMap<>();
/* We want to read an existing ZIP File, so we set this to False */
zipProperties.put("create", "false");
zipProperties.put("encoding", "UTF-8");
URI zipFile = URI.create("jar:file:" + filePath.toUri().getPath());
try (FileSystem zipfs = FileSystems.newFileSystem(zipFile, zipProperties)) {
Path rootPath = zipfs.getPath("/");
Files.walkFileTree(rootPath, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
Path targetPath = destination.resolve(rootPath.relativize(dir).toString());
if (!Files.exists(targetPath)) {
Files.createDirectory(targetPath);
}
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
Files.copy(file, destination.resolve(rootPath.relativize(file).toString()), StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING);
return FileVisitResult.CONTINUE;
}
});
}
}
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