What's Happening With New I/ONULL 博文链接：https://jia

文件名称: What's Happening With New I/O

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详细说明：NULL 博文链接：https://jiangyongyuan.iteye.com/blog/565923JavaOne ava Histol NIO/JSR-51 added in J2SE 1.4 Buffers for data of primitive types Character-set encoders and decoders Multiplexed, non-blocking o facility for developing scalable servers File interface for locking and memory mapping Also pattern matching facility for Perl-style regular expressions 2006 JavaOne SM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava History(cont J2SE 5.0 added SSLEngine Designed for use with non-blocking 0 facility Other incremental improvements J2SE50 inherited channel method Lots of bug fixes Mustang (Java sE 6) Byte Buffer isDirect(), array(, others promoted to java nio Buffer New epoll based Selector for Linux 2.6 kernel More bugs fixes 2006 JavaOneSM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava NIO, 2/JSR-203 UsR-203 submitted some time ago to work on more l/o capabilities for the Java se platform ° Three main goals: File system interface Asynchronous I/O Completion of socket channel functionality carried over from Jsr-51 2006 JavaOneSM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava JsR-203 Status EG setup in late 2005 Progressing well on file system aP and should be able to create early draft soon Will move onto Asynchronous O topic soon Other misc. topics later Target is Dolphin Java SE7 Depends of course on Dolphin EG approving it as component JSR 2006 JavaOneSM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava Why a new file system API? iava. io File has existed since JDK10 Many operations don 't throw exceptions delete, renameTo. list Does not support efficient access to file attributes File permissions, ACLs No bulk access Handling of file names problematic Access to file system features Symbolic links, extended attributes, change notification Support non-native file systems 2006 JavaOne SM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava New File System APl java nio filesystems package Provides classes to represent file names file entries file systemS, backing stores, and related classes Use existing stream and channel classes for 1/O Bridge methods to convert between java. o File and fileName Based on early/preliminary drafts so everything is subject to change 2006 JavaOneSM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava File Attributes Meta-data associated with file entry Non opaque and may have meaning at many levels Very file system/platform specific Approach group related attributes into views Views may overlap Access to a view is via attribute Accessor Provides read/write access to the attributes in the view Also related helper classes, constants 2006 JavaOneSM Conference BOF-0895 java. sun. com/javaone /sf JavaOne ava File Attributes(cont API will include a number of attribute accessors Basic, POSIX, ACL,. maybe 4 or 5 in total java nio filesystems. attributes package Capture most commonly used and well-defined Basic is simple/mandatory attributes length, type, key, and possibility time stamps POSIX is Basic plus more(owner, group, mode,. May also have accessor that provides reflective access to attributes File system implementation may support others (implementation defined 2006 JavaOneSM Conference BOF-0895 1 java. sun. com/javaone /sf

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