用Java编写简单的UDP网络通信程序

Java中封装了大量的socket API 为编写网络通信程序提供了极大的方便 在计算机网络的学习中 大家都已熟练掌握了TCP/UDP的基本原理 在此不在赘述 仅给出接收端和发送端的源代码 供大家讨论学习 发送端代码祥闷绝如下:import java io *import java lang *import *public class uclient谨姿{private DatagramSocket cliprivate DatagramPacket pacprivate byte *** []private String senpublic uclient(){Init()}public void Init(){try{//指定端口号 避免与其他应用程序发生冲突cli=new DatagramSocket( )*** =new byte[ ]sen= UDP方式发送数据 *** =sen getBytes()pac=new DatagramPacket( *** *** length InetAddress getByName( localhost ) )cli send(pac)}catch(SocketException se){se printStackTrace()}catch(IOException ie){ie printStackTrace()}}public static void main(String args[]){new uclient()}}接收端数据:import java io *import java lang *import *public class userve{private DatagramSocket serprivate DatagramPacket pacprivate byte rb[]private String revpublic userve(){Init()}public void Init()罩庆{try{ser=new DatagramSocket( )rb=new byte[ ]pac=new DatagramPacket(rb rb length)rev= int i= while(i== )//无数据 则循环{ser receive(pac)i=pac getLength()//接收数据if(i>){//指定接收到数据的长度 可使接收数据正常显示 开始时很容易忽略这一点rev=new String(rb pac getLength())System out println(rev)i= //循环接收}}}catch(Exception e){e printStackTrace()}}public static void main(String args[]){new userve()}} lishixinzhi/Article/program/Java/hx/201311/26023

TCP/IP协议端口一栏表

_____

# GoSH portlist compiled by Julian Assange - proff@suburbuia.net

#

# Please send any additions / clarifications to strobe@suburbia.net

#

reserved 0/帆羡tcp Reserved [JBP]

reserved 0/udp Reserved [JBP]

tcpmux 1/tcp TCP Port Service Multiplexer [MKL]

tcpmux 1/udp TCP Port Service Multiplexer [MKL]

compressnet 2/tcp Management Utility [BV15]

compressnet 2/udp Management Utility [BV15]

compressnet 3/tcp Compression Process [BV15]

compressnet 3/udp Compression Process [BV15]

rje 5/tcp Remote Job Entry [12,JBP]

rje 5/udp Remote Job Entry [12,JBP]

echo 7/tcp Echo [95,JBP]

echo 7/udp Echo [95,JBP]

discard 9/tcp Discard [94,JBP]

discard 9/udp Discard [94,JBP]

systat 11/tcp Active Users [89,JBP]

systat 11/udp Active Users [89,JBP]

daytime 13/tcp Daytime [93,JBP]

daytime 13/udp Daytime [93,JBP]

netstat 15/tcp Netstat

qotd 17/tcp Quote of the Day [100,JBP]

qotd 17/udp Quote of the Day [100,JBP]

msp 18/tcp Message Send Protocol [RXN]

msp 18/udp Message Send Protocol [RXN]

chargen 19/tcp ttytst source Character Generator

chargen 19/辩郑udp ttytst source Character Generator

ftp-data20/tcp File Transfer [Default Data] [96,JBP]

ftp-data20/udp File Transfer [Default Data] [96,JBP]

ftp 21/tcp File Transfer [Control] [96,JBP]

ftp 21/携轿颂udp File Transfer [Control] [96,JBP]

ssh 22/tcp Secure Shell - RSA encrypted rsh

telnet 23/tcp Telnet [112,JBP]

telnet 23/udp Telnet [112,JBP]

priv-mail24/tcp any private mail system [RA11]

priv-mail24/udp any private mail system [RA11]

smtp 25/tcp Simple Mail Transfer [102,JBP]

smtp 25/udp Simple Mail Transfer [102,JBP]

nsw-fe 27/tcp NSW User System FE [24,RHT]

nsw-fe 27/udp NSW User System FE [24,RHT]

msg-icp 29/tcp MSG ICP [85,RHT]

msg-icp 29/udp MSG ICP [85,RHT]

msg-auth31/tcp MSG Authentication [85,RHT]

msg-auth31/udp MSG Authentication [85,RHT]

dsp 33/tcp Display Support Protocol [EXC]

dsp 33/udp Display Support Protocol [EXC]

priv-print35/tcp any private printer server [JBP]

priv-print35/udp any private printer server [JBP]

time 37/tcp Time [108,JBP]

time 37/udp Time [108,JBP]

rap 38/tcp Route Access Protocol

rap 38/udp Route Access Protocol

rlp 39/tcp resource Resource Location Protocol

rlp 39/udp resource Resource Location Protocol

graphics41/tcp Graphics [129,JBP]

graphics41/udp Graphics [129,JBP]

nameserver42/tcp Host Name Server [99,JBP]

nameserver42/udp Host Name Server [99,JBP]

nicname 43/tcp Who Is [55,ANM2]

nicname 43/udp Who Is [55,ANM2]

mpm-flags44/tcp MPM FLAGS Protocol [JBP]

mpm-flags44/udp MPM FLAGS Protocol [JBP]

mpm 45/tcp Message Processing Module [recv] [98,JBP]

mpm 45/udp Message Processing Module [recv] [98,JBP]

mpm-snd 46/tcp MPM [default send] [98,JBP]

mpm-snd 46/udp MPM [default send] [98,JBP]

ni-ftp 47/tcp NI FTP [134,SK8]

ni-ftp 47/udp NI FTP [134,SK8]

auditd 48/tcp Digital Audit Daemon

auditd 48/udp Digital Audit Daemon

login 49/tcp Login Host Protocol [PHD1]

login 49/udp Login Host Protocol [PHD1]

re-mail-ck50/tcp Remote Mail Checking Protocol [171,SXD1]

re-mail-ck50/udp Remote Mail Checking Protocol [171,SXD1]

la-maint51/tcp IMP Logical Address Maintenance [76,AGM]

la-maint51/udp IMP Logical Address Maintenance [76,AGM]

xns-time52/tcp XNS Time Protocol [SXA]

xns-time52/udp XNS Time Protocol [SXA]

domain 53/tcp Domain Name Server [81,95,PM1]

domain 53/udp Domain Name Server [81,95,PM1]

xns-ch 54/tcp XNS Clearinghouse [SXA]

xns-ch 54/udp XNS Clearinghouse [SXA]

isi-gl 55/tcp ISI Graphics Language [7,RB9]

isi-gl 55/udp ISI Graphics Language [7,RB9]

xns-auth56/tcp XNS Authentication [SXA]

xns-auth56/udp XNS Authentication [SXA]

mtp 57/tcp deprecated

priv-term57/tcp any private terminal access [JBP]

priv-term57/udp any private terminal access [JBP]

xns-mail58/tcp XNS Mail [SXA]

xns-mail58/udp XNS Mail [SXA]

priv-file59/tcp any private file service [JBP]

priv-file59/udp any private file service [JBP]

ni-mail 61/tcp NI MAIL [5,SK8]

ni-mail 61/udp NI MAIL [5,SK8]

acas 62/tcp ACA Services [EXW]

acas 62/udp ACA Services [EXW]

via-ftp 63/tcp VIA Systems - FTP [DXD]

via-ftp 63/udp VIA Systems - FTP [DXD]

whois++ 63/tcp

whois++ 63/udp

covia 64/tcp Communications Integrator (CI) [TXD]

covia 64/udp Communications Integrator (CI) [TXD]

tacacs-ds65/tcp TACACS-Database Service [3,KH43]

tacacs-ds65/udp TACACS-Database Service [3,KH43]

sql*net 66/tcp Oracle SQL*NET [JFH2]

sql*net 66/udp Oracle SQL*NET [JFH2]

bootps 67/tcp Bootstrap Protocol Server [36,WJC2]

bootps 67/udp Bootstrap Protocol Server [36,WJC2]

bootpc 68/tcp Bootstrap Protocol Client [36,WJC2]

bootpc 68/udp Bootstrap Protocol Client [36,WJC2]

tftp 69/tcp Trivial File Transfer [126,DDC1]

tftp 69/udp Trivial File Transfer [126,DDC1]

gopher 70/tcp Gopher [MXC1]

gopher 70/udp Gopher [MXC1]

netrjs-171/tcp Remote Job Service [10,RTB3]

netrjs-171/udp Remote Job Service [10,RTB3]

netrjs-272/tcp Remote Job Service [10,RTB3]

netrjs-272/udp Remote Job Service [10,RTB3]

netrjs-373/tcp Remote Job Service [10,RTB3]

netrjs-373/udp Remote Job Service [10,RTB3]

netrjs-474/tcp Remote Job Service [10,RTB3]

netrjs-474/udp Remote Job Service [10,RTB3]

priv-dial75/tcp any private dial out service [JBP]

priv-dial75/udp any private dial out service [JBP]

deos 76/tcp Distributed External Object Store

deos 76/udp Distributed External Object Store

netrjs 77/tcp

priv-rje77/tcp any private RJE service [JBP]

priv-rje77/udp any private RJE service [JBP]

vettcp 78/tcp vettcp [CXL1]

vettcp 78/udp vettcp [CXL1]

finger 79/tcp Finger [52,KLH]

finger 79/udp Finger [52,KLH]

http 80/tcp www www-http World Wide Web HTTP

http 80/udp www www-http World Wide Web HTTP

www 80/tcp World Wide Web HTTP [TXL]

www 80/udp World Wide Web HTTP [TXL]

hosts2-ns81/tcp HOSTS2 Name Server [EAK1]

hosts2-ns81/udp HOSTS2 Name Server [EAK1]

xfer 82/tcp XFER Utility [TXS2]

xfer 82/udp XFER Utility [TXS2]

mit-ml-dev83/tcp MIT ML Device [DXR3]

mit-ml-dev83/udp MIT ML Device [DXR3]

ctf 84/tcp Common Trace Facility [HXT]

ctf 84/udp Common Trace Facility [HXT]

mit-ml-dev85/tcp MIT ML Device [DXR3]

mit-ml-dev85/udp MIT ML Device [DXR3]

mfcobol 86/tcp Micro Focus Cobol [SXE]

mfcobol 86/udp Micro Focus Cobol [SXE]

priv-term-l87/tcp any private terminal link [JBP]

priv-term-l87/udp any private terminal link [JBP]

ttylink 87/tcp

kerberos88/tcp Kerberos [BCN]

kerberos88/udp Kerberos [BCN]

su-mit-tg89/tcp SU/MIT Telnet Gateway [MRC]

su-mit-tg89/udp SU/MIT Telnet Gateway [MRC]

dnsix 90/tcp DNSIX Securit Attribute Token Map [CXW1]

dnsix 90/udp DNSIX Securit Attribute Token Map [CXW1]

mit-dov 91/tcp MIT Dover Spooler [EBM]

mit-dov 91/udp MIT Dover Spooler [EBM]

npp 92/tcp Network Printing Protocol [LXM]

npp 92/udp Network Printing Protocol [LXM]

dcp 93/tcp Device Control Protocol [DT15]

dcp 93/udp Device Control Protocol [DT15]

objcall 94/tcp Tivoli Object Dispatcher [TXB1]

objcall 94/udp Tivoli Object Dispatcher [TXB1]

supdup 95/tcp SUPDUP [27,MRC]

supdup 95/udp SUPDUP [27,MRC]

dixie 96/tcp DIXIE Protocol Specification [TXH1]

dixie 96/udp DIXIE Protocol Specification [TXH1]

swift-rvf97/tcp Swift Remote Vitural File Protocol [MXR]

swift-rvf97/udp Swift Remote Vitural File Protocol [MXR]

tacnews 98/tcp TAC News [ANM2]

tacnews 98/udp TAC News [ANM2]

metagram99/tcp Metagram Relay [GEOF]

metagram99/udp Metagram Relay [GEOF]

newacct100/tcp [unauthorized use]

hostname 101/tcp hostnames NIC Host Name Server

hostname 101/udp hostnames NIC Host Name Server

iso-tsap 102/tcp tsap ISO-TSAP Class 0

iso-tsap 102/udp tsap ISO-TSAP Class 0

gppitnp103/tcp Genesis Point-to-Point Trans Net [PXM1]

gppitnp103/udp Genesis Point-to-Point Trans Net [PXM1]

x400103/tcp ISO Mail

acr-nema 104/tcp ACR-NEMA Digital Imag. &Comm. 300 [PXM1]

acr-nema 104/udp ACR-NEMA Digital Imag. &Comm. 300 [PXM1]

x400-snd 104/tcp ISO Mail

csnet-ns 105/tcp Mailbox Name Nameserver [127,MS56]

csnet-ns 105/udp Mailbox Name Nameserver [127,MS56]

3com-tsmux 106/tcp 3COM-TSMUX [JXS5]

3com-tsmux 106/udp 3COM-TSMUX [JXS5]

rtelnet107/tcp Remote Telnet Service [101,JBP]

rtelnet107/udp Remote Telnet Service [101,JBP]

snagas108/tcp SNA Gateway Access Server [KXM]

snagas108/udp SNA Gateway Access Server [KXM]

pop2109/tcp postoffice Post Office Protocol - Version 2

pop2109/udp postoffice Post Office Protocol - Version 2

pop3110/tcp Post Office Protocol - Version 3 [122,MTR]

pop3110/udp Post Office Protocol - Version 3 [122,MTR]

sunrpc111/tcp rpcbind SUN Remote Procedure Call

sunrpc111/udp rpcbind SUN Remote Procedure Call

mcidas112/tcp McIDAS Data Transmission Protocol [GXD]

mcidas112/udp McIDAS Data Transmission Protocol [GXD]

auth113/tcp Authentication Service [130,MCSJ]

auth113/udp Authentication Service [130,MCSJ]

audionews 114/tcp Audio News Multicast [MXF2]

audionews 114/udp Audio News Multicast [MXF2]

sftp115/tcp Simple File Transfer Protocol [73,MKL1]

sftp115/udp Simple File Transfer Protocol [73,MKL1]

ansanotify 116/tcp ANSA REX Notify [NXH]

ansanotify 116/udp ANSA REX Notify [NXH]

uucp-path 117/tcp UUCP Path Service [44,MAE]

uucp-path 117/udp UUCP Path Service [44,MAE]

sqlserv118/tcp SQL Services [LXB3]

sqlserv118/udp SQL Services [LXB3]

nntp119/tcp Network News Transfer Protocol [65,PL4]

nntp119/udp Network News Transfer Protocol [65,PL4]

cfdptkt120/tcp CFDPTKT [JXO3]

cfdptkt120/udp CFDPTKT [JXO3]

erpc121/tcp Encore Expedited Remote Pro.Call [132,JXO]

erpc121/udp Encore Expedited Remote Pro.Call [132,JXO]

smakynet 122/tcp SMAKYNET [MXO]

smakynet 122/udp SMAKYNET [MXO]

ntp123/tcp Network Time Protocol [80,DLM1]

ntp123/udp Network Time Protocol [80,DLM1]

ansatrader 124/tcp ANSA REX Trader [NXH]

ansatrader 124/udp ANSA REX Trader [NXH]

locus-map 125/tcp Locus PC-Interface Net Map Ser [137,EP53]

locus-map 125/udp Locus PC-Interface Net Map Ser [137,EP53]

unitary126/tcp Unisys Unitary Login [FEIL]

unitary126/udp Unisys Unitary Login [FEIL]

locus-con 127/tcp Locus PC-Interface Conn Server [137,EP53]

locus-con 127/udp Locus PC-Interface Conn Server [137,EP53]

gss-xlicen 128/tcp GSS X License Verification [JXL]

gss-xlicen 128/udp GSS X License Verification [JXL]

pwdgen129/tcp Password Generator Protocol [141,FJW]

pwdgen129/udp Password Generator Protocol [141,FJW]

cisco-fna 130/tcp cisco FNATIVE [WXB]

cisco-fna 130/udp cisco FNATIVE [WXB]

cisco-tna 131/tcp cisco TNATIVE [WXB]

cisco-tna 131/udp cisco TNATIVE [WXB]

cisco-sys 132/tcp cisco SYSMAINT [WXB]

cisco-sys 132/udp cisco SYSMAINT [WXB]

statsrv133/tcp Statistics Service [DLM1]

statsrv133/udp Statistics Service [DLM1]

ingres-net 134/tcp INGRES-NET Service [MXB]

ingres-net 134/udp INGRES-NET Service [MXB]

loc-srv135/tcp Location Service [JXP]

loc-srv135/udp Location Service [JXP]

profile136/tcp PROFILE Naming System [LLP]

profile136/udp PROFILE Naming System [LLP]

netbios-ns 137/tcp NETBIOS Name Service [JBP]

netbios-ns 137/udp NETBIOS Name Service [JBP]

netbios-dgm 138/tcp NETBIOS Datagram Service [JBP]

netbios-dgm 138/udp NETBIOS Datagram Service [JBP]

netbios-ssn 139/tcp NETBIOS Session Service [JBP]

netbios-ssn 139/udp NETBIOS Session Service [JBP]

emfis-data 140/tcp EMFIS Data Service [GB7]

emfis-data 140/udp EMFIS Data Service [GB7]

emfis-cntl 141/tcp EMFIS Control Service [GB7]

emfis-cntl 141/udp EMFIS Control Service [GB7]

bl-idm142/tcp Britton-Lee IDM [SXS1]

bl-idm142/udp Britton-Lee IDM [SXS1]

imap2143/tcp Interim Mail Access Protocol v2 [MRC]

imap2143/udp Interim Mail Access Protocol v2 [MRC]

NeWS144/tcp Window System

NeWS144/udp Window System

news144/tcp NewS window system [JAG]

news144/udp NewS window system [JAG]

uaac145/tcp UAAC Protocol [DAG4]

uaac145/udp UAAC Protocol [DAG4]

iso-tp0146/tcp ISO-IP0 [86,MTR]

iso-tp0146/udp ISO-IP0 [86,MTR]

iso-ip147/tcp ISO-IP [MTR]

iso-ip147/udp ISO-IP [MTR]

cronus148/tcp CRONUS-SUPPORT [135,JXB]

cronus148/udp CRONUS-SUPPORT [135,JXB]

aed-512149/tcp AED 512 Emulation Service [AXB]

aed-512149/udp AED 512 Emulation Service [AXB]

sql-net150/tcp SQL-NET [MXP]

sql-net150/udp SQL-NET [MXP]

hems151/tcp HEMS [87,CXT]

hems151/udp HEMS [87,CXT]

bftp152/tcp Background File Transfer Program [AD14]

bftp152/udp Background File Transfer Program [AD14]

sgmp153/tcp SGMP [37,MS9]

sgmp153/udp SGMP [37,MS9]

netsc-prod 154/tcp NETSC [SH37]

netsc-prod 154/udp NETSC [SH37]

netsc-dev 155/tcp NETSC [SH37]

netsc-dev 155/udp NETSC [SH37]

sqlsrv156/tcp SQL Service [CMR]

sqlsrv156/udp SQL Service [CMR]

knet-cmp 157/tcp KNET/VM Command/Message Protocol[77,GSM11]

knet-cmp 157/udp KNET/VM Command/Message Protocol[77,GSM11]

pcmail-srv 158/tcp PCMail Server [19,MXL]

pcmail-srv 158/udp PCMail Server [19,MXL]

nss-routing 159/tcp NSS-Routing [JXR]

nss-routing 159/udp NSS-Routing [JXR]

sgmp-traps 160/tcp SGMP-TRAPS [37,MS9]

sgmp-traps 160/udp SGMP-TRAPS [37,MS9]

snmp161/tcp SNMP [15,MTR]

snmp161/udp SNMP [15,MTR]

snmptrap 162/tcp SNMPTRAP [15,MTR]

snmptrap 162/udp SNMPTRAP [15,MTR]

cmip-man 163/tcp CMIP/TCP Manager [4,AXB1]

cmip-man 163/udp CMIP/TCP Manager [4,AXB1]

cmip-agent 164/tcp CMIP/TCP Agent

smip-agent 164/udp CMIP/TCP Agent

xns-courier 165/tcp Xerox 144,SXA]

xns-courier 165/udp Xerox [144,SXA]

s-net166/tcp Sirius Systems [BXL]

s-net166/udp Sirius Systems [BXL]

namp167/tcp NAMP [MS9]

namp167/udp NAMP [MS9]

rsvd168/tcp RSVD [NT12]

rsvd168/udp RSVD [NT12]

send169/tcp SEND [WDW11]

send169/udp SEND [WDW11]

print-srv 170/tcp Network PostScript [BKR]

print-srv 170/udp Network PostScript [BKR]

multiplex 171/tcp Network Innovations Multiplex [KXD]

multiplex 171/udp Network Innovations Multiplex [KXD]

cl/1172/tcp Network Innovations CL/1 [KXD]

cl/1172/udp Network Innovations CL/1 [KXD]

xyplex-mux 173/tcp Xyplex [BXS]

xyplex-mux 173/udp Xyplex [BXS]

mailq174/tcp MAILQ [RXZ]

mailq174/udp MAILQ [RXZ]

vmnet175/tcp VMNET [CXT]

vmnet175/udp VMNET [CXT]

genrad-mux 176/tcp GENRAD-MUX [RXT]

genrad-mux 176/udp GENRAD-MUX [RXT]

xdmcp177/tcp X Display Manager Control Protocol [RWS4]

xdmcp177/udp X Display Manager Control Protocol [RWS4]

NextStep 178/udp nextstep NeXTStep NextStep Window Server

nextstep 178/tcp NextStep NeXTStep NextStep Window Server

bgp179/tcp Border Gateway Protocol [KSL]

bgp179/udp Border Gateway Protocol [KSL]

ris180/tcp Intergraph [DXB]

ris180/udp Intergraph [DXB]

unify181/tcp Unify [VXS]

unify181/udp Unify [VXS]

audit182/tcp Unisys Audit SITP [GXG]

audit182/udp Unisys Audit SITP [GXG]

ocbinder 183/tcp OCBinder [JXO1]

ocbinder 183/udp OCBinder [JXO1]

ocserver 184/tcp OCServer [JXO1]

ocserver 184/udp OCServer [JXO1]

remote-kis 185/tcp Remote-KIS [RXD1]

remote-kis 185/udp Remote-KIS [RXD1]

kis186/tcp KIS Protocol [RXD1]

kis186/udp KIS Protocol [RXD1]

aci187/tcp Application Communication Interface [RXC1]

aci187/udp Application Communication Interface [RXC1]

mumps188/tcp Plus Five's MUMPS [HS23]

mumps188/udp Plus Five's MUMPS [HS23]

qft189/tcp Queued File Transport [WXS]

qft189/udp Queued File Transport [WXS]

cacp190/udp Gateway Access Control Protocol

gacp190/tcp Gateway Access Control Protocol

prospero 191/tcp Prospero Directory Service

prospero 191/udp Prospero Directory Service

osu-nms192/tcp OSU Network Monitoring System [DXK]

osu-nms192/udp OSU Network Monitoring System [DXK]

srmp193/tcp Spider Remote Monitoring Protocol [TXS]

srmp193/udp Spider Remote Monitoring Protocol [TXS]

irc194/tcp Internet Relay Chat Protocol [JXO2]

irc194/udp Internet Relay Chat Protocol [JXO2]

dn6-nlm-aud 195/tcp DNSIX Network Level Module Audit [LL69]

dn6-nlm-aud 195/udp DNSIX Network Level Module Audit [LL69]

dn6-smm-red 196/tcp DNSIX Session Mgt Module Audit Redir[LL69]

dn6-smm-red 196/udp DNSIX Session Mgt Module Audit Redir[LL69]

dls197/tcp Directory Location Service [SXB]

dls197/udp Directory Location Service [SXB]

dls-mon198/tcp Directory Location Service Monitor [SXB]

dls-mon198/udp Directory Location Service Monitor [SXB]

smux199/tcp SMUX [MTR]

smux199/udp SMUX [MTR]

src200/tcp IBM System Resource Controller [GXM]

src200/udp IBM System Resource Controller [GXM]

at-rtmp201/tcp AppleTalk Routing Maintenance [RXC]

at-rtmp201/udp AppleTalk Routing Maintenance [RXC]

at-nbp202/tcp AppleTalk Name Binding [RXC]

at-nbp202/udp AppleTalk Name Binding [RXC]

at-3203/tcp AppleTalk Unused [RXC]

at-3203/udp AppleTalk Unused [RXC]

at-echo204/tcp AppleTalk Echo [RXC]

at-echo204/udp AppleTalk Echo [RXC]

at-5205/tcp AppleTalk Unused [RXC]

at-5205/udp AppleTalk Unused [RXC]

at-zis206/tcp AppleTalk Zone Information [RXC]

at-zis206/udp AppleTalk Zone Information [RXC]

at-7207/tcp AppleTalk Unused [RXC]

at-7207/udp AppleTalk Unused [RXC]

at-8208/tcp AppleTalk Unused [RXC]

at-8208/udp AppleTalk Unused [RXC]

tam209/tcp Trivial Authenticated Mail Protocol [DXB1]

tam209/udp Trivial Authenticated Mail Protocol [DXB1]

z39.50210/tcp ANSI Z39.50 [MXN]

z39.50210/udp ANSI Z39.50 [MXN]

914c/g211/tcp Texas Instruments 914C/G Terminal [BXH1]

914c/g211/udp Texas Instruments 914C/G Terminal [BXH1]

anet212/tcp ATEXSSTR [JXT]

anet212/udp ATEXSSTR [JXT]

ipx213/tcp IPX [DP666]

ipx213/udp IPX [DP666]

vmpwscs214/tcp VM PWSCS [DXS]

vmpwscs214/udp VM PWSCS [DXS]

softpc215/tcp Insignia Solutions [MXT]

softpc215/udp Insignia Solutions [MXT]

atls216/tcp Access Technology License Server [LXD]

atls216/udp Access Technology License Server [LXD]

dbase217/tcp dBASE Unix [DXG1]

dbase217/udp dBASE Unix [DXG1]

mpp218/tcp Netix Message Posting Protocol [STY]

mpp218/udp Netix Message Posting Protocol [STY]

uarps219/tcp Unisys ARPs [AXM1]

uarps219/udp Unisys ARPs [AXM1]

imap3220/tcp Interactive Mail Access Protocol v3 [JXR2]

imap3220/udp Interactive Mail Access Protocol v3 [JXR2]

fln-spx221/tcp Berkeley rlogind with SPX auth [KXA]

fln-spx221/udp Berkeley rlogind with SPX auth [KXA]

fsh-spx222/tcp Berkeley rshd with SPX auth [KXA]

fsh-spx222/udp Berkeley rshd with SPX auth [KXA]

rsh-spx222/tcp Berkeley rshd with SPX auth

rsh-spx222/udp Berkeley rshd with SPX auth

cdc223/tcp Certificate Distribution Center [KXA]

cdc223/udp Certificate Distribution Center [KXA]

sur-meas 243/tcp Survey Measurement [6,DDC1]

sur-meas 243/udp Survey Measurement [6,DDC1]

link245/tcp LINK [1,RDB2]

link245/udp LINK [1,RDB2]

dsp3270246/tcp Display Systems Protocol [39,WJS1]

dsp3270246/udp Display Systems Protocol [39,WJS1]

pdap344/tcp Prospero Data Access Protocol

pdap344/udp Pros

UDP（用户数据报协颤大议）是一种面向无连接的传输协议，不像TCP（传输控制协议）那样具有可靠性和流量控制功能。UDP没有默认的程序来处睁洞手理它的通信。UDP消息是在应用程序中直接发送和接收的，因此，如果应用程序需要使用UDP通信，那么就需要直接对UDP进行编程，使用相关的UDP API进行通信，例如BSD sockets、Winsock、悉嫌Java sockets等。因此，UDP通信需要通过应用程序实现，无法在 *** 作系统中通过默认程序进行处理。

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