我无法在JAR文件中获取根路径。我正在编写一种方法,使用Java NIO walkFileThree将Jar / Zip文件的内容提取到目标目录。该方法目前如下所示:
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(/)的正确方法是什么,以便我可以递归地将所有内容复制到目标文件夹?
谢谢!
答案 0 :(得分:3)
让它工作,只需按照此处的建议在relativize()之后添加一个toString():FileSystemNotFoundException
现在工作代码如下所示:
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;
}
});
}
}