nio2

来源： https://stackoverflow.com/questions/21733390/directorystream-filter-example-for-listing-files-that-based-on-certain-date-time

来源： https://stackoverflow.com/questions/21733390/directorystream-filter-example-for-listing-files-that-based-on-certain-date-time

问题 I use AsyncHttpClient library for async non blocking requests. My case: write data to a file as it is received over the network. For download file from remote host and save to file I used default ResponseBodyPartFactory.EAGER and AsynchronousFileChannel so as not to block the netty thread as data arrives. But as my measurements showed, in comparison with LAZY the memory consumption in the Java heap increases many times over. So I decided to go straight to LAZY , but did not consider the

问题 I want to create a String from the content of the file. According this answer I do it in this way: private static String buildStringFromTemplate(String stringTemplatePath) throws IOException { byte[] encoded = Files.readAllBytes(Paths.get(stringTemplatePath)); return new String(encoded, "UTF-8"); } (As I understand this is a path of new NIO2 API, that is a part of Java 7.) stringTemplatePath parameter is a name of the file ( "template.html" ). I check location of this file. It is in the

问题 I was looking for in-memory nio2 FileSystem implementations, that would allow me to more easily test my IO-dependent code. It seems natively, Java only provides (in my JDK) a Win32FileSystem and a ZipFileSystem . It seems ShrinkWrap has something of the kind, but seems to mainly deal with ZIP File Systems or whatsoever. I'd guess by the time being, some of you are already incorporating the new nio FileSystem IO in your own projects and could help me with this? Thanks 回答1: https://github.com

问题 I have a file that I've been reading into a List via the following method: List<String> doc = java.nio.file.Files.readAllLines(new File("/path/to/src/resources/citylist.csv").toPath(), StandardCharsets.UTF_8); Is there any nice (single-line) Java 7/8/nio2 way to pull off the same feat with a file that's inside an executable Jar (and presumably, has to be read with an InputStream)? Perhaps a way to open an InputStream via the classloader, then somehow coerce/transform/wrap it into a Path

问题 I get the following code snippet: datagramChannel = DatagramChannel .open(StandardProtocolFamily.INET).setOption(StandardSocketOptions.SO_REUSEADDR, true) .setOption(StandardSocketOptions.IP_MULTICAST_IF, networkInterface); datagramChannel.configureBlocking(true); datagramChannel.bind(new InetSocketAddress(filter.getType() .getPort(filter.getTimeFrameType()))); datagramChannel.join(group, networkInterface); datagramChannel.receive(buffer); This code is located in a Callable and I create up to

问题 About Path.relativize method you can read [...] This method attempts to construct a relative path that when resolved against this path, yields a path that locates the same file as the given path. For example, on UNIX, if this path is "/a/b" and the given path is "/a/b/c/d" then the resulting relative path would be "c/d". [...] So this Path p1 = Paths.get("/a/b"); Path p2 = Paths.get("/a/b/c/d"); System.out.println(p1.relativize(p2)); outputs c\d As long as I understand the whole idea is like

问题 I'm trying to find an easy way to map a URI to a Path without writing code specific to any particular file system. The following seems to work but requires a questionable technique: public void process(URI uri) throws IOException { try { // First try getting a path via existing file systems. (default fs) Path path = Paths.get(uri); doSomething(uri, path); } catch (FileSystemNotFoundException e) { // No existing file system, so try creating one. (jars, zips, etc.) Map<String, ?> env =

问题 I see a lot of examples that use Files.walkFileTree() to copy a directory and its contents from one location to another, but they fail to take the directory's file attributes and permissions into consideration. Meaning, they just invoke Files.createDirectories() without any attributes or permissions. How does one copy a directory (and its contents) from one location to another without losing file attributes or permissions, using the Java7 core classes? 回答1: Answering my own question: /** *