构建类似Google的聊天室Word下载.docx
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19this.colorSelected=colorSelected;
20}
21
22publicStringgetMessage（）{
23returnMessage;
24}
25
26publicvoidsetMessage（Stringmessage）{
27Message=message;
28}
29
30publicStringgetUserName（）{
31returnuserName;
32}
33
34publicvoidsetUserName（StringuserName）{
35this.userName=userName;
36}
37
38publicLonggetId（）{
39returnId;
40}
41
42publicvoidsetId（Longid）{
43Id=id;
44}
45
46publicStringgetMsgTime（）{
47DateFormatdateFormat=newSimpleDateFormat（"
yyyy/MM/ddHH:
mm:
ss"
）;
48Datedate=newDate（）;
49returndateFormat.format（date）;
50}
51
52publicvoidsetMsgTime（StringmsgTime）{
53MsgTime=msgTime;
54}
55}
AftercreatingthePOJOclass,createthehibernateconfigurationfile,fromwhichtheapplicationwillcometoknowthathowtomapthetable’scolumnfromdatabasetotheclassmembers,databasenameandsoon.Thehibernateconfigurationfilenamemustbe“hibernate.cfg.xml”anditshouldresideattherootofsourcecode.
Codeofhibernate.cfg.xml:
1<
?
xmlversion='
1.0'
encoding='
utf-8'
>
2<
!
DOCTYPEhibernate-configurationPUBLIC
3"
-//Hibernate/HibernateConfigurationDTD//EN"
4"
5
6<
hibernate-configuration>
7<
session-factoryname="
java:
hibernate/SessionFactory"
8<
propertyname="
hibernate.connection.driver_class"
com.mysql.jdbc.Driver<
/property>
9<
hibernate.connection.url"
jdbc:
mysql:
//localhost/test<
10<
hibernate.connection.username"
username<
11<
hibernate.connection.password"
pwd<
12<
hibernate.connection.pool_size"
10<
13<
show_sql"
true<
14<
dialect"
org.hibernate.dialect.MySQLDialect<
15<
hibernate.hbm2ddl.auto"
update<
16<
--Mappingfiles-->
17<
mappingresource="
ChatMessage.hbm.xml"
/>
18<
/session-factory>
19<
/hibernate-configuration>
Tokeepthecodesimple,normallyIadddifferentconfigurationsfordifferentclassesinhibernate.
Whatistheneedofdialectinhibernate:
DatabasesimplementsubtledifferencesintheSQLtheyuse.ThingssuchasdatatypesforexamplevaryacrossdatabasesOrdatabasespecificfunctionality–selectingthetopnrowsisdifferentdependingonthedatabase.Thedialectabstractsthissoyoudon’thavetoworryaboutit.Inshortthedialectpropertyinternallycreatesthehighlyoptimizedqueryforunderlyingdatabase.
Herealso,asyoucansee,IhaveincludedfileChatMessage.hbm.xmlfile.
CodeofChatMessage.hbm.xml:
xmlversion="
1.0"
DOCTYPEhibernate-mappingPUBLIC
-//Hibernate/HibernateMappingDTD3.0//EN"
hibernate-mappingdefault-lazy="
false"
classname="
com.G2.pojo.ChatMessage"
table="
chatmessage"
idname="
id"
type="
long"
column="
Id"
generatorclass="
identity"
/id>
Message"
columnname="
userName"
MsgTime"
20<
colorSelected"
21<
22<
23<
/class>
24<
/hibernate-mapping>
UIPartoftheapplication:
FortheUI,Ihavewrittenlotsofcssclasses,thisisnotpossibletowritecompletecodehere.Pleasecheckthecodefromdownloadlinkprovidedatthebottomofthearticle.
UIofthechatwindowiscreatedtogivethefeeloftheGmailchatapplicationasshowninbelowimage:
Gmaillikechatwindowwithemoticons
Here,findthejavascriptcode,whichisresponsibletosendtheAJAXrequesttotheservlet,andgettingbacktheresponsecode:
scripttype="
text/javascript"
2varuEnteredName=prompt（"
PleaseEnterYourName"
3$（"
#chat_Header"
）.html（uEnteredName）;
4$（"
#msg"
）.focus（）;
6functionopenEmot（）
7{
8var$ele=$（"
#emoticons"
9varvisibility=$ele.css（'
display'
10
11if（visibility=='
none'
）
12{
13$ele.show（）;
14}
15else{
16$ele.hide（）;
17}
18}
19
20functionsmileyCode（iconCode）
21{
22var$msgEle=$（"
23$msgEle.val（$msgEle.val（）+iconCode）;
24var$ele=$（"
25$ele.hide（）;
26
27$msgEle.focus（）;
30functionsaveChats（）{
31varuName=$（"
）.html（）;
32if（uName=='
'
）{
33alert（'
Pleaseenteryourname'
34returnfalse;
35}
36varmsg=$（"
）.val（）;
37//varoldMsg=$（"
#chat-area"
38varcolorCode=$（'
input[name=nameColor]:
checked'
'
#send-message-area'
39.val（）;
40
41$.ajax（{
42type:
"
POST"
43data:
uName="
+uName+"
&
msg="
+msg+"
colorCode="
44+colorCode,
45url:
Chatprocess.do"
46error:
function（xhr,ajaxOptions,thrownError）{
47alert（xhr.status）;
48alert（thrownError）;
49},
50success:
function（data）{
51$（"
）.html（data）;
52$（"
#ChatAtBigScreen"
53document.getElementById（'
chat-area'
）.scrollTop=document.getElementById（'
）.scrollHeight;
54document.getElementById（'
ChatAtBigScreen'
56}）;
57returnfalse;
58}
59$（'
#msg'
）.keyup（function（e）{
60
61if（e.keyCode==13）{
62saveChats（）;
63$（"
）.val（'
64}
65}）;
66<
/script>
Utilityclass,responsibletosavethechatinthedatabaseusinghibernate:
1packagecom.G2.Model;
3importjava.util.ArrayList;
4importjava.util.Iterator;
5importjava.util.List;
7importorg.hibernate.Query;
8importorg.hibernate.Session;
9importorg.hibernate.SessionFactory;
10importorg.hibernate.Transaction;
11importorg.hibernate.cfg.Configuration;
12
13importcom.G2.pojo.ChatMessage;
14
15publicclassDBManager{
16//ReadHibernate.cfg.xml
17staticConfigurationcf=newConfiguration（）.configure（）;
18staticSessionFactoryfactory=cf.buildSessionFactory（）;
20publicstaticvoidsaveChat（ChatMessagechat）{
22Sessionsession=null;
23try{
24
25session=factory.openSession（）;
26Transactiontx=session.beginTransaction（）;
27
28session.save（chat）;
29mit（）;
30
31}catch（Exceptione）{
32e.printStackTrace（）;
33}finally{
34if（session!
=null）{
35//Ifacedproblemhere,ifbelowlineisnotwrittenthendataautomaticallygetsdeletedafterinsertion
36session.flush（）;
37session.close（）;
38}
39}
42publicstaticList<
ChatMessage>
getMessages（）{
43List<
MessageList=newArrayList<
（）;
44Sessionsession=null;
45try{
46session=factory.openSession（）;
47StringSQL_QUERY="
fromChatMessagec"
;
48Queryquery=session.createQuery（SQL_QUERY）;
49Iterator<
it=query.iterate（）;
50while（it.hasNext（））{
51ChatMessagec=it.next（）;
52MessageList.add（c）;
53}
54
55}catch（Exceptione）{
56e.printStackTrace（）;
57}finally{
58session.flush（）;
59session.close（）;
60}
61
62returnMessageList;
63}
Asshowninabovecode,toworkwithhibernate,ourapplicationwillneedtoreadtheconfigurationfileofhibernatebybelowlineofcode:
1staticConfigurationcf=newConfiguration（）.configure（）;
Now,wewillneedtocreatethesessionobjectfromtheSessionFactoryclass:
1staticSessionFactoryfactory=cf.buildSessionFactory（）;
2Sessionsession=factory.openSession（）;
Createtheobjectoftransaction:
1Transactiontx=session.beginTransaction（）;
Tosavetheobjectinthedatabaseusesave（）methodofthetransaction.
Togetthelistofchatmessagesfromthedatabase:
1StringSQL_QUERY="
2Queryquery=session.createQuery（SQL_QUERY）;
3Iterator<
Hereobjectoforg.hibernate.Queryiscreatedandusingmethoditerate（）,itgivesalltherecordsfromthedatabaseasaobject.（ThatiswhatORM–ObjectRelationMapping）
ServletCode:
1packagecom.G2.servlets;
3importjava.io.IOException;
4importjava.io.PrintWriter;
5importjava.util.HashMap;
6importjava.util.List;
7
8importjavax.servlet.ServletException;
9importjavax.servlet.http.HttpServlet;
10importjavax.servlet.http.HttpServletRequest;
11importjavax.servlet.http.HttpServletResponse;
13importcom.G2.Model.DBManager;
14importcom.G2.pojo.ChatMessage;
15
16publicclassChatProcessextendsHttpServlet{
18@Override
19prot
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