Java I/O, NIO and NIO.2 by Jeff Friesen

By Jeff Friesen

Java I/O, NIO, and NIO.2 is a power-packed publication that speeds up your mastery of Java's a variety of I/O APIs. during this publication, you'll find out about vintage I/O APIs (File, RandomAccessFile, the circulate sessions and comparable varieties, and the reader/writer classes). subsequent, you'll find out about NIO's buffer, channel, selector, standard expression, charset, and formatter APIs. eventually, you'll become aware of NIO.2's choices by way of a higher dossier process interface, asynchronous I/O, and the of entirety of socket channel functionality.

After examining and utilizing thi booklet, you'll achieve the speeded up wisdom and ability point to truly construct functions with effective information entry, particularly for today's cloud computing streaming information needs.

What you’ll learn
How to set permissions and extra with the vintage dossier class
How to construct a flat dossier database with RandomAccessFile
Get to grasp the byte array, dossier, filter out, and other forms of streams
Master serialization and externalization
Discover personality streams and their linked writers/readers
Tour the buffer APIs
Work with channels to move buffers to and from I/O services
Find out approximately selectors and readiness selection
Master average expressions
Discover charsets and their organization with Java's String< class
Take benefit of the formatter API to create formatted output
How to customise the formatter API
Explore the enhanced dossier process interface
Discover asynchronous I/O and its organization with futures and of entirety handlers
Encounter socket channel advancements, together with multicasting
Who this booklet is for
This publication is for these skilled with Java, past the basics.

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Extra resources for Java I/O, NIO and NIO.2

Example text

Void setLength(long newLength) Set the file’s length. If the present length as returned by length() is greater than newLength, the file is truncated. In this case, if the file offset as returned by getFilePointer() is greater than newLength, the offset will be equal to newLength after setLength() returns. If the present length is smaller than newLength, the file is extended. In this case, the contents of the extended portion of the file are not defined. This method throws IOException when an I/O error occurs.

Figure 3-1 illustrates this concept in the context of a parts database. Figure 3-1. A flat file database of automotive parts is divided into records and fields According to Figure 3-1, each field has a name (partnum, desc, qty, and ucost). Also, each record is assigned a number starting at 0. This example consists of five records, of which only three are shown for brevity.

It returns false when the user doesn’t have permission to change this abstract path’s access permissions or when readable is false and the file system doesn’t implement a read permission. 38 CHAPTER 2: File  boolean setReadable(boolean readable) is a convenience method that invokes the previous method to set the read permission for the owner.  boolean setWritable(boolean writable, boolean ownerOnly) enables (pass true to writable) or disables (pass false to writable) this abstract path’s write permission for its owner (pass true to ownerOnly) or everyone (pass false to ownerOnly).

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