Android Network Programming API Note-java.net packet-related interface API

Android Network Programming related packages : 9 packets, 20 interfaces, 103 classes, 6 enumerations, 14 exceptions;

-- Java Package : Java.net Package (6 interfaces, 34 classes, 2 enumerations, 12 exceptions);

-- Android pack : android.net Packets (1 interfaces, 19 classes, 3 enumerations, 1 exceptions), Android.net.http packets (6 classes), ANDROID.NET.NSD packets (3 interfaces, 2 classes), ANDROID.NET.RTP (4 classes), Andro ID.NET.SIP Packets (1 interfaces, 9 classes, 1 exceptions), Android.net.wifi packets (16 classes, 1 enumerations), ANDROID.NET.WIFI.P2P packets (9 interfaces, 7 classes), ANDROID.NET.WIFI.P2P.NSD packets ( Class 6);

contenthandlerfactory : The interface defines the content handler factory;

datagramsocketimplfactory : This interface defines the user datagram implementation factory;

fileNameMap : An interface that defines the mapping mechanism between a file name and a MIME Type string ;

socketimplfactory : Define socket Implementation factory;

socketoptions : Defines the interface that gets the method that sets the socket option ;

urlstreamhandlerfactory : Defines the URL stream protocol handler factory;

1. ContentHandlerFactory

role : Defines the content handler factory, which is responsible for mapping MIME types to ContentHandler instance objects;

MIME parsing :

-- extension : Multipurpose Internet Mail extentions Multi-purpose Internet Message extension type;

--- function : A file with a extension is opened using the B program, and when the a extension file is accessed, the browser automatically calls the B program to open the a extension file;

-- Use form : More for associating with custom file suffix file opening mode and media file open mode;

Interface Usage Environment : URLStreamHandler creates MIME Type ContentHandler using the method implemented by this interface;

interface Method Parsing :

ContentHandler Createcontenthandler (String mimetype)

-- function: Creates a new ContentHandler, which ContentHandler can read from the URLStreamHandler;

2. Datagramsocketimplfactory

function : Defines the factory used for the implementation of the packet sockets;

Interface Usage Environment : Datagramsocket Use this interface method to create a socket instance;

interface Method Parsing :

Datagramsocketimpl Createdatagramsocketimpl ()

-- function: Creating an Datagramsocketimpl instance object;

3. fileNameMap

function : The interface required for mapping between file names and MIME Type strings ;

interface Method Parsing :

String Getcontenttypefor (String fileName)

-- function: Gets the MIME Type string for the specified file name;

4. SocketImplFactory

function : Used to define sockets to implement the factory;

usage Environment : sockets and ServerSocket Use the method defined by this interface to create a socket instance;

Method Parsing :

SocketImpl Createsocketimpl ()

-- function: Create a new socket instance;

5. Socketoptions

function : Defines the method of setting the access socket option;

Interface Usage Environment : SocketImpl and Datagramsocketimpl Implement the interface, the subclass of the two classes should override this interface, to support the choice of subclass of two classes;

(1) Constant field parsing

ip_multicast_if : Set up an outgoing interface for sending multicast packets (eth0, eth1, wlan0, etc.);

-- using the environment : can be used on a host with multiple network interfaces , in this case the application does not use the system default interface, and the use of other interfaces;

IP Multicast : One host (multicast source) sends the same data to multiple hosts at the same time;

ip-multicast_if2 : The same as ip_multicast_if, but adds support for IPv4 IPV6, which is supported from version 1.4 ;

if_multicast_loop : Used to start or disable multicast datagrams sent, the default state is to start;

Ip_tos : Set the service type or traffic field of the TCP UDP datagram in the IP address header ;

TOS (type of service) : Prioritize packets in the network, single-byte, the following are common constant service types;

-- Iptos_lowdelay : Delay minimization;

-- Iptos_throughput : Optimizing throughput;

-- iptos_reliability : Reliability optimization;

-- iptos_mincost : Fill data, these data can be transmitted at low speed, insignificant;

so_bindaddr : Gets the local address of the bound socket;

--The socket local address cannot be changed : The socket is bound to the address at the time of creation and therefore cannot be changed;

-- Socket default address : Inaddr_any represents any address of a multi-homed host (host with multiple IP addresses);

so_reuseaddr : For MulticastSocket only, MulticastSocket set this option by default and is valid for Datagramsocketimpl;

so_broadcast : Start the processing ability to disable sending broadcast messages;

-- usage Scenarios : Datagram sockets, networks that support the concept of broadcast messages;

-- default setting : Datagramsocket the option to start by default;

so_keepalive : TCP sockets Set this option, the data is not transmitted through the Socket within 2 hours, TCP sends the KEEPALIVE probe to the same body;

-- function : Detect whether the host is crashed;

where applicable : only valid for TCP sockets;

-- the same bit through the expected ACK response : The application is not notified, after another 2 hours without data transmission, TCP continues to send a probe;

--The same bit through RST response : Notify the local TCP host crashed, shut down the socket restart host;

-- no response of the same body : close the socket directly;

so_linger : The timeout value for closing the stay, that is, the time to wait after the TCP Socket executes close;

-- enable a non-0 timeout value : Close () blocks until the transmit and confirm read and write is complete, forcing the shutdown through TCP RST if the timeout occurs;

-- Enable 0 timeout value : Close () will be forced to shut down, no wait;

so_oobinline : Whether to discard TCP emergency data received by the socket;

-- startup option : The TCP emergency data received by the socket is received through the socket input stream;

-- Disable option : The received TCP emergency data is discarded directly;

so_rcvbuf (receive) : Sets the buffer size of the network input ;

-- Set method use : Sets the size of the buffer used to receive data through the socket;

-- Gets the method used : Gets the receive data buffer size set by the socket;

-- applicable situation : SocketImpl, Datagramsocketimpl;

so_sndbuf (send): Set the base IO buffer size hint for the network output ;

-- Set method use : Sets the size of the buffer used when sending data through the socket;

-- Get method used : Gets the size of the send data buffer set by the socket;

-- applicable situation : SocketImpl, Datagramsocketimpl;

so_timeout : Sets the timeout value for Socket blocking;

-- timeout operation : Serversocket.accept (), Socketinputstream.read (), datagramsocket.receive ();

-- Set timing : This option must be set before entering the block before it is valid, if it is blocked, the setting will not take effect for this block;

-- Timeout processing : If a timeout occurs, the block will continue to execute, but the interruptedioexception exception will be thrown, and the Socket will not be closed;

where applicable : This setting is valid for all sockets (SocketImpl, Datagramsocketimpl);

tcp_nodelay : Set the link of this parameter to disable the Nagle algorithm;

Nagle Algorithm Analysis : Reduce the number of packets, to increase the efficiency of the network software, to avoid a packet only 1 bytes, but the use of 40 bytes of the header file case;

(2) Detailed interface method

void setOption (int optid, Object value) throws SocketException

-- function : Enable/Disable the specified option, if enabled, the value option will be used;

-- option incoming error : If the incoming value is malformed, an error will occur;

-- incoming basic data type : Using an Integer Boolean package;

-- Disable option : Pass in New Boolean (false) to disable any options and enable this option if you pass in other content;

-- Exception : If the option matches the error, or the socket is closed and other errors, the socketexception exception will be reported;

Object getOption (int optid) throws SocketException

-- function: Gets the value of the option;

6. URLStreamHandlerFactory

interface Function : The factory that defines the URL stream protocol handler, and the URL class implements the interface to create the URLStreamHandler for the specific protocol;

Createurlstreamhandler URLStreamHandler Createurlstreamhandler (String protocol)

-- function: Creates a new URLStreamHandler instance with the specified protocol;