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Java基础day21
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Java基礎(chǔ)day21 Java基礎(chǔ)day21-網(wǎng)絡(luò)編程 1.網(wǎng)絡(luò)編程入門 1.1 網(wǎng)絡(luò)編程概述 1.2 網(wǎng)絡(luò)編程三要素 1.3 IP地址 1.4InetAddress 2.UDP通信程序 2.1 UDP發(fā)送數(shù)據(jù) 2.2UDP接收數(shù)據(jù) 2.3UDP通信程序練習(xí) 3.TCP通信程序 3.1TCP發(fā)送數(shù)據(jù) 3.2TCP接收數(shù)據(jù) 3.3TCP通信程序練習(xí) 3.4TCP通信程序練習(xí) 3.5TCP通信程序練習(xí) 3.6TCP通信程序練習(xí)【應(yīng)用】 3.7TCP通信程序練習(xí) 3.8TCP通信程序練習(xí)
Java基礎(chǔ)day21-網(wǎng)絡(luò)編程
1.網(wǎng)絡(luò)編程入門
1.1 網(wǎng)絡(luò)編程概述
計(jì)算機(jī)網(wǎng)絡(luò) 網(wǎng)絡(luò)編程 1.2 網(wǎng)絡(luò)編程三要素
IP地址 端口 協(xié)議 1.3 IP地址
IP地址：是網(wǎng)絡(luò)中設(shè)備的唯一標(biāo)識
IP地址分為兩大類 DOS常用命令： 特殊IP地址： 1.4InetAddress
InetAddress：此類表示Internet協(xié)議（IP）地址
方法名說明 static InetAddress getByName(Stringhost) 確定主機(jī)名稱的IP地址。主機(jī)名稱可以是機(jī)器名稱，也可以是IP地址 String getHostName() 獲取此IP地址的主機(jī)名 String getHostAddress() 返回文本顯示中的IP地址字符串
import java
. net
. InetAddress
;
import java
. net
. UnknownHostException
; public class test1 { public static void main ( String
[ ] args
) throws UnknownHostException
{ InetAddress address
= InetAddress
. getByName ( "58.199.157.8" ) ; String name
= address
. getHostAddress ( ) ; String ip
= address
. getHostAddress ( ) ; System
. out
. println ( "主機(jī)名" + name
) ; System
. out
. println ( "ip地址" + ip
) ; }
}
1.5端口和協(xié)議
端口 端口號65535。其中，0 1023之間的端口號用于一些知名的網(wǎng)絡(luò)服 協(xié)議 UDP協(xié)議 TCP協(xié)議 傳輸控制協(xié)議 (Transmission Control Protocol) TCP協(xié)議是面向連接的通信協(xié)議，即傳輸數(shù)據(jù)之前，在發(fā)送端和接收端建立邏輯連接，然后再傳輸數(shù)據(jù)，它提供了兩臺計(jì)算機(jī)之間可靠無差錯(cuò)的數(shù)據(jù)傳輸。在TCP連接中必須要明確客戶端與服務(wù)器端，由客戶端向服務(wù)端發(fā)出連接請求，每次連接的創(chuàng)建都需要經(jīng)過“三次握手” 三次握手：TCP協(xié)議中，在發(fā)送數(shù)據(jù)的準(zhǔn)備階段，客戶端與服務(wù)器之間的三次交互，以保證連接的可靠 2.UDP通信程序
2.1 UDP發(fā)送數(shù)據(jù)
Java中的UDP通信 構(gòu)造方法 方法名說明 DatagramSocket() 創(chuàng)建數(shù)據(jù)報(bào)套接字并將其綁定到本機(jī)地址上的任何可用端口 DatagramPacket(byte[] buf,int len,InetAddress add,int port) 創(chuàng)建數(shù)據(jù)包,發(fā)送長度為len的數(shù)據(jù)包到指定主機(jī)的指定端口
方法名說明 void send(DatagramPacket p) 發(fā)送數(shù)據(jù)報(bào)包 void close() 關(guān)閉數(shù)據(jù)報(bào)套接字 void receive(DatagramPacket p) 從此套接字接受數(shù)據(jù)報(bào)包
import java
. io
. IOException
;
import java
. net
. *
; public class test2 { public static void main ( String
[ ] args
) throws IOException
{ DatagramSocket ds
= new DatagramSocket ( ) ; byte [ ] bys
= "hello,udp,我來了" . getBytes ( ) ; DatagramPacket dp
= new DatagramPacket ( bys
, bys
. length
, InetAddress
. getByName ( "58.199.157.8" ) , 10086 ) ; ds
. send ( dp
) ; ds
. close ( ) ; }
}
2.2UDP接收數(shù)據(jù)
接收數(shù)據(jù)的步驟 構(gòu)造方法 方法名說明 DatagramPacket(byte[] buf, int len) 創(chuàng)建一個(gè)DatagramPacket用于接收長度為len的數(shù)據(jù)包
方法名說明 byte[] getData() 返回?cái)?shù)據(jù)緩沖區(qū) int getLength() 返回要發(fā)送的數(shù)據(jù)的長度或接收的數(shù)據(jù)的長度
import java
. io
. IOException
;
import java
. net
. DatagramPacket
;
import java
. net
. DatagramSocket
; public class test3 { public static void main ( String
[ ] args
) throws IOException
{ DatagramSocket ds
= new DatagramSocket ( 13456 ) ; while ( true ) { byte [ ] bys
= new byte [ 1024 ] ; DatagramPacket dp
= new DatagramPacket ( bys
, bys
. length
) ; ds
. receive ( dp
) ; System
. out
. println ( "數(shù)據(jù)是：" + new String ( dp
. getData ( ) , 0 , dp
. getLength ( ) ) ) ; } }
}
2.3UDP通信程序練習(xí)
案例需求 代碼實(shí)現(xiàn) public class Send { public static void main ( String
[ ] args
) throws IOException
{ DatagramSocket ds
= new DatagramSocket ( ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( System
. in
) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { if ( "886" . equals ( line
) ) { break ; } byte [ ] bys
= line
. getBytes ( ) ; DatagramPacket dp
= new DatagramPacket ( bys
, bys
. length
, InetAddress
. getByName ( "58.199.157.8" ) , 12345 ) ; ds
. send ( dp
) ; } ds
. close ( ) ; }
} import java
. io
. IOException
;
import java
. net
. DatagramPacket
;
import java
. net
. DatagramSocket
;
public class Receive { public static void main ( String
[ ] args
) throws IOException
{ DatagramSocket ds
= new DatagramSocket ( 12345 ) ; while ( true ) { byte [ ] bys
= new byte [ 1024 ] ; DatagramPacket dp
= new DatagramPacket ( bys
, bys
. length
) ; ds
. receive ( dp
) ; System
. out
. println ( "數(shù)據(jù)是：" + new String ( dp
. getData ( ) , 0 , dp
. getLength ( ) ) ) ; }
}
}
3.TCP通信程序
3.1TCP發(fā)送數(shù)據(jù)
Java中的TCP通信 構(gòu)造方法 方法名說明 Socket(InetAddress address,int port) 創(chuàng)建流套接字并將其連接到指定IP指定端口號 Socket(String host, int port) 創(chuàng)建流套接字并將其連接到指定主機(jī)上的指定端口號
方法名說明 InputStream getInputStream() 返回此套接字的輸入流 OutputStream getOutputStream() 返回此套接字的輸出流
3.2TCP接收數(shù)據(jù)
方法名說明 ServletSocket(int port) 創(chuàng)建綁定到指定端口的服務(wù)器套接字
方法名說明 Socket accept() 監(jiān)聽要連接到此的套接字并接受它
import java
. io
. IOException
;
import java
. io
. OutputStream
;
import java
. net
. Socket
; public class Client { public static void main ( String
[ ] args
) throws IOException
{ Socket s
= new Socket ( "58.199.157.8" , 15800 ) ; OutputStream os
= s
. getOutputStream ( ) ; os
. write ( "hello,tcp,我來了" . getBytes ( ) ) ; s
. close ( ) ; }
}
import java
. io
. IOException
;
import java
. io
. InputStream
;
import java
. net
. ServerSocket
;
import java
. net
. Socket
; public class Server { public static void main ( String
[ ] args
) throws IOException
{ ServerSocket ss
= new ServerSocket ( 15800 ) ; Socket s
= ss
. accept ( ) ; InputStream is
= s
. getInputStream ( ) ; byte [ ] bys
= new byte [ 1024 ] ; int len
= is
. read ( bys
) ; String data
= new String ( bys
, 0 , len
) ; System
. out
. println ( "數(shù)據(jù)是：" + data
) ; s
. close ( ) ; ss
. close ( ) ; }
}
3.3TCP通信程序練習(xí)
案例需求 案例分析 代碼實(shí)現(xiàn) import java
. io
. IOException
;
import java
. io
. InputStream
;
import java
. io
. OutputStream
;
import java
. net
. Socket
; public class Client { public static void main ( String
[ ] args
) throws IOException
{ Socket s
= new Socket ( "58.199.157.8" , 15000 ) ; OutputStream os
= s
. getOutputStream ( ) ; os
. write ( "hello,tcp,我來了" . getBytes ( ) ) ; InputStream is
= s
. getInputStream ( ) ; byte [ ] bys
= new byte [ 1024 ] ; int len
= is
. read ( bys
) ; String data
= new String ( bys
, 0 , len
) ; System
. out
. println ( "客戶端：" + data
) ; s
. close ( ) ; }
} import java
. io
. IOException
;
import java
. io
. InputStream
;
import java
. io
. OutputStream
;
import java
. net
. ServerSocket
;
import java
. net
. Socket
; public class Server { public static void main ( String
[ ] args
) throws IOException
{ ServerSocket ss
= new ServerSocket ( 15000 ) ; Socket s
= ss
. accept ( ) ; InputStream is
= s
. getInputStream ( ) ; byte [ ] bys
= new byte [ 1024 ] ; int len
= is
. read ( bys
) ; String data
= new String ( bys
, 0 , len
) ; System
. out
. println ( "服務(wù)器：" + data
) ; OutputStream os
= s
. getOutputStream ( ) ; os
. write ( "數(shù)據(jù)已經(jīng)收到" . getBytes ( ) ) ; ss
. close ( ) ; }
}
3.4TCP通信程序練習(xí)
案例需求 案例分析 代碼實(shí)現(xiàn) import java
. io
. *
;
import java
. net
. Socket
; public class Client { public static void main ( String
[ ] args
) throws IOException
{ Socket s
= new Socket ( "58.199.157.8" , 15000 ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( System
. in
) ) ; BufferedWriter bw
= new BufferedWriter ( new OutputStreamWriter ( s
. getOutputStream ( ) ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { if ( "886" . equals ( line
) ) { break ; } bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } s
. close ( ) ; }
} import java
. io
. BufferedReader
;
import java
. io
. IOException
;
import java
. io
. InputStreamReader
;
import java
. net
. ServerSocket
;
import java
. net
. Socket
; public class Server { public static void main ( String
[ ] args
) throws IOException
{ ServerSocket ss
= new ServerSocket ( 15000 ) ; Socket s
= ss
. accept ( ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( s
. getInputStream ( ) ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { System
. out
. println ( line
) ; } ss
. close ( ) ; }
}
3.5TCP通信程序練習(xí)
案例需求 案例分析 代碼實(shí)現(xiàn) import java
. io
. *
;
import java
. net
. Socket
; public class Client { public static void main ( String
[ ] args
) throws IOException
{ Socket s
= new Socket ( "58.199.157.8" , 15000 ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( System
. in
) ) ; BufferedWriter bw
= new BufferedWriter ( new OutputStreamWriter ( s
. getOutputStream ( ) ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { if ( "886" . equals ( line
) ) { break ; } bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } s
. close ( ) ; }
} import java
. io
. *
;
import java
. net
. ServerSocket
;
import java
. net
. Socket
; public class Server { public static void main ( String
[ ] args
) throws IOException
{ ServerSocket ss
= new ServerSocket ( 15000 ) ; Socket s
= ss
. accept ( ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( s
. getInputStream ( ) ) ) ; BufferedWriter bw
= new BufferedWriter ( new FileWriter ( "src\\s.txt" ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } bw
. close ( ) ; ss
. close ( ) ; }
}
3.6TCP通信程序練習(xí)【應(yīng)用】
案例需求 案例分析 代碼實(shí)現(xiàn)
在這里插入代碼片
3.7TCP通信程序練習(xí)
案例需求 案例分析 相關(guān)方法 方法名說明 void shutdownInput() 將此套接字的輸入流放置在“流的末尾” void shutdownOutput() 禁止用此套接字的輸出流
import java
. io
. *
;
import java
. net
. Socket
; public class Client { public static void main ( String
[ ] args
) throws IOException
{ Socket s
= new Socket ( "58.199.157.8" , 15000 ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( System
. in
) ) ; BufferedWriter bw
= new BufferedWriter ( new OutputStreamWriter ( s
. getOutputStream ( ) ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } br
. close ( ) ; s
. close ( ) ; }
} import java
. io
. *
;
import java
. net
. ServerSocket
;
import java
. net
. Socket
; public class Server { public static void main ( String
[ ] args
) throws IOException
{ ServerSocket ss
= new ServerSocket ( 15000 ) ; Socket s
= ss
. accept ( ) ; BufferedReader br
= new BufferedReader ( new InputStreamReader ( s
. getInputStream ( ) ) ) ; BufferedWriter bw
= new BufferedWriter ( new FileWriter ( "src\\s.txt" ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } bw
. close ( ) ; ss
. close ( ) ; }
}
3.8TCP通信程序練習(xí)
案例需求 案例分析 代碼實(shí)現(xiàn) import java
. io
. *
;
import java
. net
. Socket
; public class Client { public static void main ( String
[ ] args
) throws IOException
{ Socket s
= new Socket ( "58.199.157.8" , 15000 ) ; BufferedReader br
= new BufferedReader ( new FileReader ( "src\\fw.txt" ) ) ; BufferedWriter bw
= new BufferedWriter ( new OutputStreamWriter ( s
. getOutputStream ( ) ) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } s
. shutdownOutput ( ) ; BufferedReader brClient
= new BufferedReader ( new InputStreamReader ( s
. getInputStream ( ) ) ) ; String data
= brClient
. readLine ( ) ; System
. out
. println ( "服務(wù)器的反饋：" + data
) ; br
. close ( ) ; s
. close ( ) ; }
} import java
. io
. *
;
import java
. net
. Socket
; public class ServerThread implements Runnable { private Socket s
; public ServerThread ( Socket s
) { this . s
= s
; } @Override public void run ( ) { try { BufferedReader br
= new BufferedReader ( new InputStreamReader ( s
. getInputStream ( ) ) ) ; int count
= 0 ; File file
= new File ( "src\\Copy[" + count
+ "].java" ) ; while ( file
. exists ( ) ) { count
++ ; file
= new File ( "src\\Copy[" + count
+ "].java" ) ; } BufferedWriter bw
= new BufferedWriter ( new FileWriter ( file
) ) ; String line
; while ( ( line
= br
. readLine ( ) ) != null
) { bw
. write ( line
) ; bw
. newLine ( ) ; bw
. flush ( ) ; } BufferedWriter bwServer
= new BufferedWriter ( new OutputStreamWriter ( s
. getOutputStream ( ) ) ) ; bwServer
. write ( "文件上傳成功" ) ; bwServer
. newLine ( ) ; bwServer
. flush ( ) ; s
. close ( ) ; } catch ( IOException e
) { e
. printStackTrace ( ) ; } }
} import java
. io
. IOException
;
import java
. net
. ServerSocket
;
import java
. net
. Socket
; public class Server { public static void main ( String
[ ] args
) throws IOException
{ ServerSocket ss
= new ServerSocket ( 15000 ) ; while ( true ) { Socket s
= ss
. accept ( ) ; new Thread ( new ServerThread ( s
) ) . start ( ) ; } }
}
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