{"id":50925,"date":"2017-10-05T15:00:48","date_gmt":"2017-10-05T12:00:48","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=50925"},"modified":"2019-03-12T11:16:56","modified_gmt":"2019-03-12T09:16:56","slug":"java-nio-socketchannel-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/nio\/java-nio-socketchannel-example\/","title":{"rendered":"Java Nio SocketChannel Example"},"content":{"rendered":"

SocketChannel<\/span> is a selectable channel belonging to the java.nio.channels<\/code> package and is used for reading or writing the stream-oriented data. In this tutorial, we learn how to use the SocketChannel<\/code> and how it is used for reading or writing the stream-oriented data by using the TCP based protocol.
\n 
\n 
\n 
\n 
\n 
\n 
\n \n<\/p>\n

1. Introduction<\/h2>\n

Java Nio was developed to allow the Java programmers implement the high-speed input-output operations without using the custom native code. Nio moves the time-taking I\/O activities like filling, namely and draining buffers etc back into the operating system, thus allows the great increase in the operational speed.<\/p>\n

1.1 Java Nio Components<\/h3>\n

The Java Nio classes are contained in the java.nio<\/code> package and it is important to understand that the Nio subsystem does not replace the existing stream-based I\/O classes available in java.io<\/code> package. The important Nio classes are grouped under different categories that are shown below:<\/p>\n

\"Fig.<\/a>
Fig. 1: Nio Components<\/figcaption><\/figure><\/p>\n

Let us understand the important classes contained in these groups.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
Package<\/th>\nPurpose<\/th>\n<\/tr>\n
java.nio<\/code><\/td>\nIt is a top-level package for NIO system. The various types of buffers are encapsulated by this NIO system.<\/td>\n<\/tr>\n
java.nio.charset<\/code><\/td>\nIt encapsulates the character sets and also supports the encoding and the decoding operation that converts the characters to bytes and bytes to characters.<\/td>\n<\/tr>\n
java.nio.charset.spi<\/code><\/td>\nIt supports the service provider for the character sets.<\/td>\n<\/tr>\n
java.nio.channels<\/code><\/td>\nIt supports the channel which is essentially open for the I\/O connections.<\/td>\n<\/tr>\n
java.nio.channels.spi<\/code><\/td>\nIt supports the service providers for the channels.<\/td>\n<\/tr>\n
java.nio.file<\/code><\/td>\nIt provides the support for the files.<\/td>\n<\/tr>\n
java.nio.file.spi<\/code><\/td>\nIt supports the service providers for the file system.<\/td>\n<\/tr>\n
java.nio.file.attribute<\/code><\/td>\nIt provides the support for the file attributes.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

1.2 Java Nio Channels<\/h3>\n

In Java Nio, Channels<\/strong> are used for the input-output transfers. A channel is like a tube that transports the data between a buffer and an entity at the other end<\/span>. A channel reads the data from an entity and places it in the buffer blocks for consumption. The developers then write the data to the buffer blocks so that it can be transported by the channel to the other end.<\/p>\n

Channels are the gateway provided by the Java Nio package to access the native input-output mechanism. Developers should use buffers<\/em> to interact with the channels and to perform the input-output operations where these buffers act as the endpoints provided by the channels to send and receive the data.<\/p>\n

\"Fig.<\/a>
Fig. 2: Nio Channels<\/figcaption><\/figure><\/p>\n

1.2.1 Channel Characteristics<\/h4>\n