Chapter 13. New I/O API (NIO.2)
NIO.2 was introduced with JDK 7 to provide enhanced file I/O support and access to the default filesystem. NIO.2 is supported by the java.nio.file
and java.nio.file.attribute
packages. The NIO.2 API is also known as JSR 203: More New I/O APIs for the Java Platform. Popular interfaces that are used from the API are Path
, PathMatcher
, FileVisitor
, and WatchService
. Popular classes that are used from the API are Paths
and Files
.
The Path Interface
The Path
interface can be used to operate on file and directory paths. This class is an upgraded version of the java.io.File
class. The following code demonstrates the use of some of the methods of the Path
interface and the Paths
class for acquiring information:
Path
p
=
Paths
.
get
(
"\\opt\\jpgTools\\README.txt"
);
System
.
out
.
println
(
p
.
getParent
());
// \opt\jpgTools
System
.
out
.
println
(
p
.
getRoot
());
// \
System
.
out
.
println
(
p
.
getNameCount
());
// 3
System
.
out
.
println
(
p
.
getName
(
0
));
// opt
System
.
out
.
println
(
p
.
getName
(
1
));
// jpgTools
System
.
out
.
println
(
p
.
getFileName
());
// README.txt
System
.
out
.
println
(
p
.
toString
());
// The full path
The Path
class also provides additional features, some of which are detailed in Table 13-1.
Path method | Capability |
---|---|
path.toUri() |
Converts a path to a URI object |
path.resolve(Path) |
Combines two paths together |
path.relativize(Path) |
Constructs a path from one location to another |
path.compareTo(Path) |
Compares two paths against each ... |
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