"DAY16" 16th day Socket Socket Learning Note

Complementary knowledge points for serialization

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Use objects for inter-network transport or localized storage.

Also called serialization

Procedure to convert Java objects to byte[]

Java.io.Serializable//serializable interface, identification. Jvm.

Serialized version UID://

Deep replication refers to copying an entire object graph.

Transient://Temp keyword.

Objectinputstream/objectouputstream

Bytearrayinputstream/Bytearrayoutputstream

Read (char c) write (byte[])

DataInputStream//Data input stream

DataOutputStream//Output output stream

byte[] bytes = "China". GetBytes ("iso-8859-1");

New String (Bytes, "iso-8859-1");

String.getbytes ("CharSet"); //For string encoding

New String (Bytes, "charset") '; //decoding

Use the Bin/native2ascii tool provided by the JDK to implement Chinese transcoding:

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1. Create a text file (GBK encoding, it is recommended to use Notepad. ) 1.txt

[1.txt]

You ABC good, China!

2. Enter the 1.txt directory with cmd

Cmd

3.native2ascii-encoding gb2312 1.txt 2.txt

Ui:user interface

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1.GUI://graphic user interface

2.Label://tags, cannot be edited, display text

3.Button//button

4.Checkbox//check box

5.RadioBox//radio button

6.Menubar//menu bar

7.Menu//Menu

8.MenuItem//menu item

9.Toolbar//toolbar

10.Statusbar//status bar

11.TitleBar//title bar

12.Scrollbar//scroll bar

13.Taskbar//taskbar

14.active//activated

15.deactive//passivated

16.TextField//text box, single line

17.TextArea//Text field, multiple lines

18.password//Password box

Socket

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1. Sockets.

2.client/server://client/server

3.ServerSocket://server-side socket, receive request.

4.ss.accept ()//Accept

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Exception type in socket usage

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The following four types are inherited from IOException: So a lot of the ioexception can be ejected directly.

Unkownhostexception: host name or IP error

Connectexception: The server refused the connection, the server did not start, (exceeded the number of queues, refused to connect)

Sockettimeoutexception: Connection timed out

Bindexception: The socket object cannot be bound to the established local IP address or port　

Socket method

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Getinetaddress (); IP address on remote server

Getport (); Ports on the remote server

getlocaladdress () IP address of the local client

Getlocalport () port of the local client

getInputStream (); Get input stream

Getoutstream (); Get the output stream

It is worth noting that in these methods, the most important is getinputstream () and Getoutputstream ().

Socket status

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IsClosed (); If the connection is closed, returns true if it is turned off, otherwise false

Isconnect (); Returns true if it has ever been connected; false otherwise

Isbound (); Returns true if the socket is already bound to a local port, otherwise false

Tcp

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1.transfer control protocal, transmission protocol

2. You must first establish a connection, a reliable protocol. No data loss.

Udp

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1.User Datagram protocal, User Datagram protocol.

2. Without first establishing a link, unreliable protocol (relying on a reliable network), data loss (related to the reliability of the current network).

Mvc

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1.model-view-controller, Model View Control

"DAY16" 16th day Socket Socket Learning Note