发布一篇java程序将汉字存进mysql数据库中时酿成乱码

有了这样一个呼声：让java代替C语言成为基本语言。这些足以说明java简单易学的这个优点。其次，java的功能强大，前面我也提到了，EJB3.0的推出使java成为了大型项目的首选。
明天忧郁了一天，java程序在向mysql拔出数据前不是乱码，数据库安装时也选了编码为utf8（和我程序的编码格局分歧）。但是拔出数据就酿成乱码，相称忧郁。
缘故原由：mysql的设置文件中的编码并没有改成utf8,；
办理举措：在mysql的安装目次下找到my.ini文件，将内里两处触及编码的中央改成utf8,以下：

2. #MySQLServerInstanceConfigurationFile
3. #----------------------------------------------------------------------
4. #GeneratedbytheMySQLServerInstanceConfigurationWizard
5. #
6. #
7. #InstallationInstructions
8. #----------------------------------------------------------------------
9. #
10. #OnLinuxyoucancopythisfileto/etc/my.cnftosetglobaloptions,
11. #mysql-data-dir/my.cnftosetserver-specificoptions
12. #(forthisinstallation)orto
13. #~/.my.cnftosetuser-specificoptions.
14. #
15. #OnWindowsyoushouldkeepthisfileintheinstallationdirectory
16. #ofyourserver(e.g.C:ProgramFilesMySQLMySQLServerX.Y).To
17. #makesuretheserverreadstheconfigfileusethestartupoption
18. #"--defaults-file".
19. #
20. #Torunruntheserverfromthecommandline,executethisina
21. #commandlineshell,e.g.
22. #mysqld--defaults-file="C:ProgramFilesMySQLMySQLServerX.Ymy.ini"
23. #
24. #ToinstalltheserverasaWindowsservicemanually,executethisina
25. #commandlineshell,e.g.
26. #mysqld--installMySQLXY--defaults-file="C:ProgramFilesMySQLMySQLServerX.Ymy.ini"
27. #
28. #Andthenexecutethisinacommandlineshelltostarttheserver,e.g.
29. #netstartMySQLXY
30. #
31. #
32. #Guildlinesforeditingthisfile
33. #----------------------------------------------------------------------
34. #
35. #Inthisfile,youcanusealllongoptionsthattheprogramsupports.
36. #Ifyouwanttoknowtheoptionsaprogramsupports,starttheprogram
37. #withthe"--help"option.
38. #
39. #Moredetailedinformationabouttheindividualoptionscanalsobe
40. #foundinthemanual.
41. #
42. #
43. #CLIENTSECTION
44. #----------------------------------------------------------------------
45. #
46. #ThefollowingoptionswillbereadbyMySQLclientapplications.
47. #NotethatonlyclientapplicationsshippedbyMySQLareguaranteed
48. #toreadthissection.IfyouwantyourownMySQLclientprogramto
49. #honorthesevalues,youneedtospecifyitasanoptionduringthe
50. #MySQLclientlibraryinitialization.
51. #
52. [client]
54. port=3306
56. [mysql]
58. <spanstyle="color:#ff0000;">default-character-set=utf8
60. </span>
61. #SERVERSECTION
62. #----------------------------------------------------------------------
63. #
64. #ThefollowingoptionswillbereadbytheMySQLServer.Makesurethat
65. #检察本栏目更多出色内容：http://www.bianceng.cn/Programming/Java/
66. #youhaveinstalledtheservercorrectly(seeabove)soitreadsthis
67. #file.
68. #
69. [mysqld]
71. #TheTCP/IPPorttheMySQLServerwilllistenon
72. port=3306
75. #Pathtoinstallationdirectory.Allpathsareusuallyresolvedrelativetothis.
76. basedir="C:/ProgramFiles/MySQL/MySQLServer5.5/"
78. #Pathtothedatabaseroot
79. datadir="C:/DocumentsandSettings/AllUsers/ApplicationData/MySQL/MySQLServer5.5/Data/"
81. #Thedefaultcharactersetthatwillbeusedwhenanewschemaortableis
82. #createdandnocharactersetisdefined
83. <spanstyle="color:#ff0000;">character-set-server=utf8
85. </span>#Thedefaultstorageenginethatwillbeusedwhencreatenewtableswhen
86. default-storage-engine=INNODB
88. #SettheSQLmodetostrict
89. sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
91. #ThemaximumamountofconcurrentsessionstheMySQLserverwill
92. #allow.Oneoftheseconnectionswillbereservedforauserwith
93. #SUPERprivilegestoallowtheadministratortologinevenifthe
94. #connectionlimithasbeenreached.
95. max_connections=100
97. #QuerycacheisusedtocacheSELECTresultsandlaterreturnthem
98. #withoutactualexecutingthesamequeryonceagain.Havingthequery
99. #cacheenabledmayresultinsignificantspeedimprovements,ifyour
100. #havealotofidenticalqueriesandrarelychangingtables.Seethe
101. #"Qcache_lowmem_prunes"statusvariabletocheckifthecurrentvalue
102. #ishighenoughforyourload.
103. #Note:Incaseyourtableschangeveryoftenorifyourqueriesare
104. #textuallydifferenteverytime,thequerycachemayresultina
105. #slowdowninsteadofaperformanceimprovement.
106. query_cache_size=0
108. #Thenumberofopentablesforallthreads.Increasingthisvalue
109. #increasesthenumberoffiledescriptorsthatmysqldrequires.
110. #Thereforeyouhavetomakesuretosettheamountofopenfiles
111. #allowedtoatleast4096inthevariable"open-files-limit"in
112. #section[mysqld_safe]
113. table_cache=256
115. #Maximumsizeforinternal(in-memory)temporarytables.Ifatable
116. #growslargerthanthisvalue,itisautomaticallyconvertedtodisk
117. #basedtableThislimitationisforasingletable.Therecanbemany
118. #ofthem.
119. tmp_table_size=17M
122. #Howmanythreadsweshouldkeepinacacheforreuse.Whenaclient
123. #disconnects,theclientsthreadsareputinthecacheiftherearent
124. #morethanthread_cache_sizethreadsfrombefore.Thisgreatlyreduces
125. #theamountofthreadcreationsneededifyouhavealotofnew
126. #connections.(Normallythisdoesntgiveanotableperformance
127. #improvementifyouhaveagoodthreadimplementation.)
128. thread_cache_size=8
130. #***MyISAMSpecificoptions
132. #ThemaximumsizeofthetemporaryfileMySQLisallowedtousewhile
133. #recreatingtheindex(duringREPAIR,ALTERTABLEorLOADDATAINFILE.
134. #Ifthefile-sizewouldbebiggerthanthis,theindexwillbecreated
135. #throughthekeycache(whichisslower).
136. myisam_max_sort_file_size=100G
138. #Ifthetemporaryfileusedforfastindexcreationwouldbebigger
139. #thanusingthekeycachebytheamountspecifiedhere,thenpreferthe
140. #keycachemethod.Thisismainlyusedtoforcelongcharacterkeysin
141. #largetablestousetheslowerkeycachemethodtocreatetheindex.
142. myisam_sort_buffer_size=34M
144. #SizeoftheKeyBuffer,usedtocacheindexblocksforMyISAMtables.
145. #Donotsetitlargerthan30%ofyouravailablememory,assomememory
146. #isalsorequiredbytheOStocacherows.Evenifyourenotusing
147. #MyISAMtables,youshouldstillsetitto8-64Masitwillalsobe
148. #usedforinternaltemporarydisktables.
149. key_buffer_size=25M
151. #SizeofthebufferusedfordoingfulltablescansofMyISAMtables.
152. #Allocatedperthread,ifafullscanisneeded.
153. read_buffer_size=64K
154. read_rnd_buffer_size=256K
156. #ThisbufferisallocatedwhenMySQLneedstorebuildtheindexin
157. #REPAIR,OPTIMZE,ALTERtablestatementsaswellasinLOADDATAINFILE
158. #intoanemptytable.Itisallocatedperthreadsobecarefulwith
159. #largesettings.
160. sort_buffer_size=256K
163. #***INNODBSpecificoptions***
166. #UsethisoptionifyouhaveaMySQLserverwithInnoDBsupportenabled
167. #butyoudonotplantouseit.Thiswillsavememoryanddiskspace
168. #andspeedupsomethings.
169. #skip-innodb
171. #AdditionalmemorypoolthatisusedbyInnoDBtostoremetadata
172. #information.IfInnoDBrequiresmorememoryforthispurposeitwill
173. #starttoallocateitfromtheOS.Asthisisfastenoughonmost
174. #recentoperatingsystems,younormallydonotneedtochangethis
175. #value.SHOWINNODBSTATUSwilldisplaythecurrentamountused.
176. innodb_additional_mem_pool_size=2M
178. #Ifsetto1,InnoDBwillflush(fsync)thetransactionlogstothe
179. #diskateachcommit,whichoffersfullACIDbehavior.Ifyouare
180. #willingtocompromisethissafety,andyouarerunningsmall
181. #transactions,youmaysetthisto0or2toreducediskI/Otothe
182. #logs.Value0meansthatthelogisonlywrittentothelogfileand
183. #thelogfileflushedtodiskapproximatelyoncepersecond.Value2
184. #meansthelogiswrittentothelogfileateachcommit,butthelog
185. #fileisonlyflushedtodiskapproximatelyoncepersecond.
186. innodb_flush_log_at_trx_commit=1
188. #ThesizeofthebufferInnoDBusesforbufferinglogdata.Assoonas
189. #itisfull,InnoDBwillhavetoflushittodisk.Asitisflushed
190. #oncepersecondanyway,itdoesnotmakesensetohaveitverylarge
191. #(evenwithlongtransactions).
192. innodb_log_buffer_size=1M
194. #InnoDB,unlikeMyISAM,usesabufferpooltocachebothindexesand
195. #rowdata.ThebiggeryousetthisthelessdiskI/Oisneededto
196. #accessdataintables.Onadedicateddatabaseserveryoumaysetthis
197. #parameterupto80%ofthemachinephysicalmemorysize.Donotsetit
198. #toolarge,though,becausecompetitionofthephysicalmemorymay
199. #causepagingintheoperatingsystem.Notethaton32bitsystemsyou
200. #mightbelimitedto2-3.5Gofuserlevelmemoryperprocess,sodonot
201. #setittoohigh.
202. innodb_buffer_pool_size=47M
204. #Sizeofeachlogfileinaloggroup.Youshouldsetthecombinedsize
205. #oflogfilestoabout25%-100%ofyourbufferpoolsizetoavoid
206. #unneededbufferpoolflushactivityonlogfileoverwrite.However,
207. #notethatalargerlogfilesizewillincreasethetimeneededforthe
208. #recoveryprocess.
209. innodb_log_file_size=24M
211. #NumberofthreadsallowedinsidetheInnoDBkernel.Theoptimalvalue
212. #dependshighlyontheapplication,hardwareaswellastheOS
213. #schedulerproperties.Atoohighvaluemayleadtothreadthrashing.
214. innodb_thread_concurrency=8

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