bai19 struts basic

8/12/2019 Bai19 Struts Basic

1/20

9/10/201

LP TRNH WEB HNG JAVABi 19: C bn v Struts

Ging vin: ThS. Trnh Tun tB mn CNPM

Email: [email protected]/[email protected]

B mn Cng ngh Phn mmVin CNTT & TT

Trng i hc Bch Khoa H Ni

1DatTT-DSE-SOICT-HUST

Ni dung

1. Struts l g, ti sao s dng Struts? 2. Kin trc ca Struts

ControllerModel

View

3. web.xml

4. Internationalization

5. Input Validation

6. X l li 7. Chn View tr v


1.1. Struts l g?


Jakarta Struts

Struts l mt Web application frameworkmngun m, l mt phn ca Apache Jakartaprojecthttp://jakarta.apache.org/struts/


1.1. Struts l g?

Model-View-Controller (MVC) framework

c s dng xy dng cc ng dng Web sdng Servlets v JSPs ng dng Struts l ng dng Web, chy c trn bt k

Sevlet container no, bao gm c tt c cc J2EEcompliant App servers

Tun theo cc mu thit k Singleton, composition view, delegate

D hc & s dng

C km cc th vin th JSP custom tag


Struts cho php cc LTV ...

Pht trin ng dng web JSP/Servlet theom hnh MVC

S dng cc i tng c sn ca frameworktrong file cu hnh XML

S dng cc mu thit k xy dng sn caframework

S dng cc c tnh nng cao nh inputvalidation, internationalization



2/20

9/10/201

1.2. Ti sao s dng Struts


1.2. Ti sao s dng Struts?

Struts m nhim nhng phn phc tp nht khixy dng ng dng MVC

D hc v s dng Nhiu tnh nng Nhiu cng c h tr ca bn th 3 (third party

tools)

Linh ng v d m rng (Flexible & extensible) Cng ng s dng ng o n nh v vn ang lin tc pht trin M ngun m


1.2. Ti sao s dng Struts?

Tch hp tt vi Java EE (J2EE) H tr taglib tt X l li thng nht, theo c 2 c ch

programmatic v declarative

Tch hp vi Tiles framework (Struts nngcao)


2. Kin trc ca Struts


Model-View-Control (model 2)

Request1

(Controller)Servlet

(View)JSPResponse

5

3

4

BROWSER

Servlet Container (EIS)

Redirect2

(Model)Java Bean

MVC Design Pattern


Struts hot ng nh th no



3/20

9/10/201

Struts: Kin trc MVC

Controller trung tm iu hnh lung ng dng, yquyn cho cc b x l thch hp gi lAction

Action Handlers c th s dng cc modelcomponents Model ng gi trng thi hoc logic nghip v iu khin c chuyn tip (forward) cho

Controller vi View ph hp Vic forward c th c xc nh bng vic tra cu t

tp cc mappings trong file cu hnh, cho php tng linh ng ga tng View v Model


Struts: Kin trc MVC

3 thnh phn chnh trong StrutsServlet controller (Controller)

Java Server Pages hoc bt k cng ngh hinth no khc (View)

Application Business Logic dng bt k ph hpvi ng dng (Model)

Struts tp trung ch yu vo phn Controller Struts c s c lp gia Model & View Struts c th s dng bt k cng ngh Model &View no


Struts: Kin trc MVC

File cu hnh cha cc action mappingsnh x URL vi cc Action Controller s dng cc mapping ny tr v

HTTP requests cho Action no ca ng dng Xc nh forwarding/navigation

Mapping phi m t c ng dn ca yu cu: request path

Action x l request nhn c


2.1. Controller


Controller c nhim v g?

Ging nh 1 switch trong kin trc MVC Tt c cc request phi i qua controller Chu trch nhim iu khin lung cho cc

x l request (action mapping) c file cu hnh xc nh lung iu khin


Cc thnh phn Controller



4/20

9/10/201

Controller trong Struts Framework

Struts framework cung cp servlet:org.apache.struts.action.ActionServlet

Phi cu hnh Servlet mapping cho servlet nytrong file web.xml

Cc cu hnh lin quan ti Struts khc cto lp trong file struts-config.xmlAction Mapping nh ngha cc nh x gia URI

ca request gi n vi 1 lp Action c th


Nhim v ca LTV

Vit lp Action (k tha lp Action) cho mirequest c th nhn c Phi override phng thc execute() (phng

thc perform() trong Struts 1.0)

Vit action mapping trong file cu hnhstruts-config.xml

Cp nht file web.xml, thc hin mappingcho ActionServletweb.xml


Cc thnh phn Controller trong StrutsFramework

ActionServlet (Struts cung cp) RequestProcessor (Struts 1.1) (Struts cung cp)

Cho mi module

Action (LTV vit) LTV k tha lp Action do Struts cung cp

Action Mapping (To bi LTV) LTV to cc action mapping trong file struts-config.xml Struts framework s to cc i tng ActionMapping v

truyn chng cho i tng Action


2.1.1. ActionServlet(Framework cung cp)


Nhim v ca ActionServlet?

Thc hin vai tr ca Controller X l cc user requests Xc nh xem user cn g, cn c o request

nhn c Ly d liu t model (nu cn thit), v Ly ra view ph hp tr v cho ngi dng

y nhim hu ht nhng cng vic ny cholp Action


Nhim v ca ActionServlet? (2)

Chu trch nhim khi to v dn dp tinguyn loads cc cu hnh ng dng trong web.xml Duyt ln lt cc goes through an enumeration

of all init-param elements, looking for thoseelements who's name starts with config/ formodules

truy cp vo module foo, s dng URL nh:http://localhost:8080/myApp/foo/someAction.do



5/20

9/10/201

iu khin lung bi Controller


Lung Struts (Struts 1.0)Http://myhost/authorize.do

Server configured to pass *.do extensions to

org.apache.struts.action.ActionServletvia a

web.xml configuration file

ActionServlet object inspects the URI and tries to match itagainst anActionMapping located in the struts-config.xml file

Instance of appropriateAction class is found and its execute()is called.

Action object handles the request and returns a next view.View is identified byActionForward objerct.


2.1.2. RequestProcessor(Framework cung cp)


Nhim v ca RequestProcessor?

processPath Xc nh ng dn (path) c request. Sau s c

s dng ly v mt ActionMapping.

processLocale Chn mt locale (nu cha chn locale no) v t n

vo trong request.

processContent Thit lp content type mc nh (ty chn cch encoding)

cho tt c cc response nu c yu cu


What Does RequestProcessor Do?

processMapping Xc nh ActionMapping ng vi ng dn yu cu.

processRoles Nu mapping c kt hp vi mt role, cn m bo

user c role tng ng . Nu khng, to ra mt errorv dng x l request.

processActionForm To mt thc th ActionForm (nu cn thit) kt hp vi

mapping trn (nu c), vi tm vc (scope) ph hp



processPopulate Gn ActionForm vi request, nu c

processValidate Thc hin validate (nu c yu cu) trnActionForm gn vi request ny (nu c).

processForward Nu mapping biu din mt forward, forward

n ng dn c ch nh trong mapping.



6/20

9/10/201


processInclude Nu mapping biu din mt include, include kt

qu ca vic gi n ng dn (path) trongrequest ny

processActionCreate

To mt thc th ca lp c c t trongActionMapping ang xt (nu cn).

processActionPerform L lc m phng thc perform() hoc execute()

s c gi31DatTT-DSE-SOICT-HUST


processForwardConfig Cui cng, phng thc x l ca

RequestProcessor ly v ActionForward tr v tlp Action, v s dng n chn ra resourcetip theo (nu c).

Thng ActionForward s dn n cc trangtrnh din (presentation page), sinh ra responsetr v cho client.


2.1.3. Action Mapping(LTV vit)


Action Mapping trong file cu hnh Struts

Struts controller ActionServlet cn bit 1 sthng tin map mi request URI gi nvi lp Action ph hp

Cc yu cu ny c ng gi trong mtJava interface l ActionMapping

Struts framework s to i tngActionMapping cho mi phn t cu hnh

trong file struts-config.xml


Struts Config File (struts-config.xml)

struts-config.xml cha 3 phn t quan trng

m t cc actions: cha cc nh ngha FormBean

bao gm tn v kiu (classname) cha cc nh ngha action

S dng mt phn t cho mi action cnh ngha

cha c nh ngha globalforward



Phn t ny cha cc nh ngha form bean. S dng phn t cho mi form

bean, bao gm 2 thuc tnh quan trng sau:name: the name of the request request (and session

level attribute that this form bean will be stored as)

type: tn lp y ca form bean



7/20

9/10/201

struts-config.xml:

1.

2.

5.

6. 7.

8.

10.



Phn t ny cha cc nh ngha action. Mi

action cn nh ngha ng vi mt phn t



Mi phn t cn nh ngha cc thuc

tnh sau: path: ng dn ti action (tng i so vi context

ca ng dng) (URI ca request) type: Tn y ca lp Action name: Tn ca phn t s dng vi

action ny

input: Tn ca trang hin th khi c li validate inputform scope: Tm vc ca form bean c to validate: C thc hin validate input form hay khng 39DatTT-DSE-SOICT-HUST

struts-config.xml:

1.2.

3. 9. 10. 11.

12.

13.


struts-config.xml:

1.

2.

9.

10.


Action Mapping Config File

Forwards l cc thc th ca lpActionForward

c tr v t phng thc execute() ca lpAction

Thc hin map cc logical names vi ccresources c th (thng l cc trang JSPs)

Phn t c cc thuc tnh sau name: logical name ca forward

c s dng trong phng thc execute() ca lp Action forward n ti nguyn tip theo

path: resource s c forward nredirect: redirect (true) hay forward (false) 42DatTT-DSE-SOICT-HUST


8/20

9/10/201

Global Forwarding

1.2. 3. 6. 7. 9. 13. 14.


Local Forwarding

1.2.8. 11. 14.


2.1.4. ActionForm(LTV phi cung cp, nu khng sdng DynaActionForm)


ActionForm Bean (Form bean)

Vit bi LTV nh ngha mt ActionForm bean (bn cht l 1 lp Java

k tha lp ActionForm) cho input form nh ngha trong file struts-config.xml

Tn thuc tnh ca lp

Ch cha cc phng thc getter & setter cho ccthuc tnh (khng c x l nghip v)

Cung cp c ch validation chun tc


ActionForm Bean & Controller

Vi miActionForm bean c nh ngha trong file

servlet-config.xml, Controller (ActionServlet) s Kim tra session scope cho 1 thc th ca ActionForm

bean Nu khng tn ti, controller s to mi mt thc th

Gi phng thc setter tng ng ca ActionForm beancho tt c cc tham s request c tn trng vi tn cathuc tnh ca bean

Truyn i tng ActionForm bean lm tham s caphng thc execute() ca lp Action


Vit mt ActionForm Bean?

Ch cn vit phng thc getter v setter cho

mi thuc tnh ca mt input form Khng c bt k on code x l nghip v no

Thm 1 phng thc validate chun tc:validate() Controller s gi n phng thc ny

nh ngha mt thuc tnh (cng vi phngthc getXxx v setXxx) cho mi trng xuthin trong input form



9/20

9/10/201

Vd:submit.jsp

1.2.

3.

4.

5.

6.Submit example

7.

8.Example Submit Page

9.

10.

11.Last Name:

12.Address:

13.Sex: Male

14. Female

15.Married:

16.Age:

17. 0-19

18. 20-49

19. 50-

20.

21.

22.49DatTT-DSE-SOICT-HUST

Model: ActionForm

1.package submit;

2.import javax.servlet.http.HttpServletRequest;3.import org.apache.struts.action.*;

4.public final class SubmitForm extends ActionForm {

5. /* Last Name */6. private String lastName = "Hansen"; // default value7. public String getLastName() {8. return (this.lastName);9. }10. public void setLastName(String lastName) {11. this.lastName = lastName;12. }

13. /* Address */14. private String address = null;15. public String getAddress() {16. return (this.address);17. }18. public void setAddress(String address) {19. this.address = address;20. }21.... 50DatTT-DSE-SOICT-HUST

struts-config.xml:

1.

2.

5.

6. 7.

8.

10.


struts-config.xml:

1.2.

3. 9. 10. 11.

12.

13.


DynaActionForm trong Struts 1.1

Thay v to mt lp con cho ActionForm vi

cc phng thc get/set cho mi thuc tnhca bean, LTV c th lit k cc thuc tnhny, cng vi kiu, gi tr mc nh trong filecu hnh Struts NN s dng DanaActionForm khi c th

(Struts nng cao)


2.1.5. Action(LTV t vit)



10/20

9/10/201

1

Action Class Diagram


Lp Action

Tp trung vo lung iu khin X l client request bng cch gi cch i tng khc

(BusinessLogic beans) trong phng thc execute() can Tr v mt i tng ActionForward nh danh mt

destination resource m iu khin s c forward nDestination resource c th l

JSP

Tile definition

Velocity template

Action khc


Lp Action l g?

Lp Java thc hin cc cng vic trong ng dng X l request Thc hin cc x l logic nghip v

C th n gin hoc phc tp Lp action n gin t thc hin x l logic nghip v Lp action phc tp y quyn cc x l logic nghip v

cho cc thnh phn Model Chc nng ca lp Action ging nh mu thit k Facade


V d Action: Logon

ng dng cn Xc thc ngi dng Thit lp User Session X l li

Cn vit code lp LogonAction


Nhim v ca LTV: Action Class

K tha org.jakarta.struts.action.ActionOverride

Phng thc execute() (trong Struts 1.1) Phng thc perform() (trong Struts 1.0)


Phng thc execute(..) ca lp Action(Ch trong Struts 1.1)

c gi bi controller

publicActionForward execute(ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response)

throws Exception;



11/20

9/10/201

Phng thc perform(..) ca lp Action(Ch trong Struts 1.0)

Deprecated

publicActionForward perform(ActionMapping mapping,

ActionForm form,

HttpServletRequest request,

HttpServletResponse response)

throws IOException, ServletException;


Phng thc execute() ca lp Action

Thc hin cc x l cn thit vi request Cp nht cc i tng pha server (Scope

variables) c s dng to trang tr vcho ngi dng

Tr v i tng ActionForward ph hp


V d: lp Action1.package submit;

2.import javax.servlet.http.*;

3.import org.apache.struts.action.*;

4.public final class SubmitAction extends Action {

5. public ActionForward execute(ActionMapping mapping,

6. ActionForm form,

7. HttpServletRequest request,

8. HttpServletResponse response) {

9. SubmitForm f = (SubmitForm) form; // get the form bean

10. // and take the last name value

11. String lastName = f.getLastName();

12. // Translate the name to upper case

13. //and save it in the request object

14. request.setAttribute("lastName", lastName.toUpperCase());15.

16. // Forward control to the specified success target

17. return (mapping.findForward("success"));

18. }

19.}63DatTT-DSE-SOICT-HUST

Hng dn thit k lp Action

Controller Servlet to 1 thc th duy nhtcho lp Action, v s dng n cho tt c ccrequest Lp Action phi hot ng ch multi-

threaded safe

Ch s dng cc bin local (as opposed toinstanace variables)

Ch nn to cc lp Action n gin S dng cc thnh phn Model cho cc x l

logic nghip v phc tp64DatTT-DSE-SOICT-HUST

V d 2: Lp Action1.package submit;



4.public final class SubmitAction extends Action {5. public ActionForward execute(ActionMapping mapping,

6. ActionForm form,






12. if (lastName.startsWith(Passion)){



15. request.setAttribute("lastName", lastName.toUpperCase());



18. }

19. else{

20. return (mapping.findForward("failure"));

21. }

22. }

23.} 65DatTT-DSE-SOICT-HUST

struts-config.xml: ActionMapping

1. 2.

3. 9. 10. 11.

12.



12/20


13/20

9/10/201

1

Cc thnh phn Model trong StrutsFramework

ActionForm Bean Lu ActionForm Bean l mt Model component,

mc d n ch biu din d liu nhp bi ngidng

SystemState Bean

Ch l thut ng mc khi nim: Struts khngcung cp cc API lp trnh

BusinessLogic Bean Ch l thut ng mc khi nim: Struts khng

cung cp cc API lp trnh73DatTT-DSE-SOICT-HUST

Struts Model Components

System State Bean & Businesslogic Bean


System State Bean

Struts khng nh ngha lp chun cho loi beanny

Xc nh trng thi hin ti C th c biu din bi tp mt hoc nhiu cc lp

JavaBeans, cc lp c cc thuc tnh xc nh trng thihin ti

V d: h thng gi hng-shopping cart: Cha mt bean tng trng cho gi hng c qun l

c lp cho mi ngi mua hng Bao gm tp cc items m ngi mua hng chn mua


System State Bean

Vi h thng quy m nh, ho vi cc thng tintrng thi (state information) khng cn lu tr ludi: Tp cc system state beans c th cha ton b tri thc

h thng c c

Vi ng dng quy m ln Cc System state beans c th biu din thng tin c

lu tr lu di trong cc CSDL ngoi V d: i tng CustomerBean tng ng vi 1 row no

trong bng CUSTOMERS C th s dng EJB


BusinessLogic Bean

Struts khng nh ngha lp chun cho loibean ny C th l mt JavaBean thng thng C th l EJB c trng thi hoc phi trng thi

ng gi cc functional logic (lm thay itrng thi h thng) thnh cc phng thc H thng ln: phng thc nm lun trong cc

beans biu din trng thi h thng H thng nh: phng thc nm trong cc lpAction


BuesinessLogic Bean

L tng nht l phi c thit k sao cho

chng khng bit mnh c thc thi trnmi trng Web Khng nn tham chiu n bt k i tng no

trong ng dng Web Tng tnh ti s dng



14/20

9/10/201

1

2.3. Cc thnh phn View

(View Components)

LTV phi cung cp


View components


View Components

CcJSP files cho tng ng dng Tp cc JSP custom tag libraries Cc Resource files cho tnh nng

internationalization

Cho php nhanh chng to form cho cc ngdng

Phi hp hot ng vi controller Servlet


View

i tngActionForward thng bo viServlet controller trang JSP no s c trv (dispatched)

Cc trang JSP s dngActionForm ly dliu output t Model hin th

Struts c tp cc th vin th (tag libraries) D pht trin cc ni dung ng n gin trao i gia HTML designer v LTV


Forms v FormBean Interactions

Nu user gy li (vd: nhp liu), ng dng

cn cho php h sa i li gi tr cVi JSP:

Vi Struts, ch cn;


V d: submit.jsp1.2.3.4.

5.6.Submit example7.


9.

10.11.Last Name:
12.Address:
13.Sex: Male14. Female
15.Married:
16.Age: 17. 0-1918. 20-4919. 50-2 0. < /h tml:se le ct>
21. 22.



15/20

9/10/201

1

V d: submit.jsp

1.2.Hello

3.

4. young

5.

6.

7 . o ld

8.

9.

10.

11.

12.


3. web.xml


Web App Deployment Descriptor(web.xml)

ng dng Struts l mt ng dng Web Tun th theo lut chung Phi c file deployment descriptor - web.xml

web.xml cha: Cu hnh mapping cho ActionServlet nh ngha Resource file trong Ch nh file servlet-config.xml trong nh ngha cc th vin th Struts

web.xml c lu tr trong WEB-INF/web.xml


V d: web.xml1.

4.5. Advanced J2EE Programming Class Sample App6.7. 8. 9. action10. 11. org.apache.struts.action.ActionServlet12. 13. 14. application15. ApplicationResources

16. 17. 18. config19. /WEB-INF/struts-config.xml20. 21. 88DatTT-DSE-SOICT-HUST

V d: web.xml1. 2.

3. action

4. *.do5.

6.

7.

8.

9. /WEB-INF/struts-bean.tld

10. /WEB-INF/struts-bean.tld

11.

12.

13. /WEB-INF/struts-html.tld

14. /WEB-INF/struts-html.tld

15.

16.

17. /WEB-INF/struts-logic.tld

18. /WEB-INF/struts-logic.tld

19.

20. 89DatTT-DSE-SOICT-HUST

4. Internationalization



16/20

9/10/201

1

Internationalization

M rng cajava.util.ResourceBundleorg.apache.struts.util.MessageResources

Ch gii hn h tr hin th. Nhp liu tytheo thit b client

Cu hnh resource bundles trong web.xmlfile


Internationalization: Nhim v ca LTV

To resource file cho ngn ng mc nh To cc resource files cho mi ngn ng

mun h tr nh ngha tn ca cc resource nh cc

tham s khi toTrong trang JSP

S dng hin th cc thngbo li theo locale


Resource files

MyApplication.properties Cha thng ip vit bng ngn ng mc nh Mi thng ip c dng (vd Ting Anh):

prompt.hello=Hello

MyApplication_xx.properties

Cha cng thng ip tng ng, nhng cc ngn ng khc, c m ngn ng theo chun

ISO l "xx"prompt.hello=Bonjour


V d: ApplicationResource.properties

1.errors.header=Validation Error(s)2.errors.footer=

3.error.lastName=Enter your last name

4.error.address=Enter your address

5.error.sex=Enter your sex

6.error.age=Enter your age


V d: web.xml

1.

2. action3.

4. org.apache.struts.action.ActionServlet

5.

6.

7. application

8.

9. com.mycompany.mypackage.MyApplication

10.

11.

12.

13.


5. (Input) Validation



17/20

9/10/201

1

Validation: Nhim v ca LTV (Struts 1.0)

Ch nh s thc hin validate input bng thuc tnhvalidate ca phn t (con ca phn t

) trong file servlet-config.xml validate=true

Ch nh trang JSP cn c hin th khi validationkhng thnh cng input=/errorpage.jsp

Override phng thc validate() trong lpActionForm Ty chn


validate() method

c gi bi controller servlet Sau khi ly xong cc thuc tnh ca bean

Nhng trc khi phng thc execute() ca lp Actiontng ng c gi

Ty chn Phng thc mc nh tr v null

C php:public ActionErrors validate(ActionMapping mapping,

HttpServletRequest request);


V d: phng thc validate()

Trong ng dng Login Cn m bo nhp ng thi c username vpassword

Cn m bo password c t nht l 6 k t


Phng thc validate()

Sau khi thc hin validate Nu khng xy ra li validate no, tr v null Nu xy ra li validate, tr v 1 thc th ca lpActionErrors

Mi ActionError cha kha thng ip li (error message key)trong MessageResources bundle ca ng dng

Controller servlet lu tr mng ActionErrors nh 1 thuc tnhrequest s dng cho cc th

Controller sau forwards iu khin t li input form (xc nhtrong thuc tnh input ho Actionmapping tng ng)


Lp ActionError

L c ch c s dng tr v cc li khi

thc hin validate input ng gi li cc li

Cc message key c s dng tm kim ramessage text ph hp t cc resource file

ActionErrors l mt tp cc ActionError


struts-config.xml: Validation

1. 2.

3. 9. 10. 11.

12.



18/20

9/10/201

1

ActionForm1.public final class SubmitForm extends ActionForm {2.3....4. public ActionErrors validate(ActionMapping mapping,5. HttpServletRequest request) {

6. ...7.8. // Check for mandatory data9. ActionErrors errors = new ActionErrors();10. if (lastName == null || lastName.equals("")) {11. errors.add("Last Name", new ActionError("error.lastName"));12. }13. if (address == null || address.equals("")) {14. errors.add("Address", new ActionError("error.address"));15. }16. if (sex == null || sex.equals("")) {17. errors.add("Sex", new ActionError("error.sex"));18. }19. if (age == null || age.equals("")) {20. errors.add("Age", new ActionError("error.age"));21. }22. return errors;23 . }24...25.}


V d: submit.jsp1.

2.

3.

4.

5.

6.Submit example

7.


9.

10.

11.Last Name:

12.Address:

13.Sex: Male

14. Female

15.Married:

16.Age:

17. 0-19

18. 20-49

19. 50-

2 0. < /html :s elec t>

21.

22. 104DatTT-DSE-SOICT-HUST

Validator Framework trong Struts 1.1

Validation logic c th c m t trong filecu hnh struts-config.xml Thay v phi vit code phng thc Java:

validate()

(Struts nng cao)


6. X l li (Error Handling)


CustomExceptionHandler (1.1)

T nh ngha lp ExceptionHandler, c

gi n khi phng thc execute() ca 1Action nm ra 1 Exception L lp con ca

org.apache.struts.action.ExceptionHandler

Phng thc execute() phi x l Exception vtr v 1 i tng ActionForward thng bovi Struts s forward n u tip


ExceptionHandler t nh ngha (1.1)

Cu hnh b x l ngoi l trong struts-config.xml

com.yourcorp.ExceptionHandler.execute() sc gi khi c bt k mt IOException noc nm ra bi mt Action



19/20

9/10/201

1

CustomExceptionHandler (1.1)

C th c tc dng global hoc cho tngaction


V d: nm ra mt Exception1.package hansen.playground;





6. ActionForm form,

7. HttpServletRequest request,8. HttpServletResponse response) {




12. if (lastName.startsWith(Passion)){






18. }

19. else{

20. throw new WrongLastNameExcetion(lastName);

21. }

22. }


ExceptionHandler t nh ngha (1.1)

Cc ExceptionHandler khc nhau cho cc likhc nhau


7. View Selection


View Selection: Nhim v ca LTV

Trong file struts-config ,Vi mi outcome (gi tr ca thuc tnh name ca

th ), ch nh trang JSP s cforward ti nh th con , con ca th hoc th

Trong phng thc execute() ca lp Action, Tr v i tng ActionForward, ng vi

outcome no.


struts-config.xml: ActionMapping

1. 2.

3. 9. 10. 11.

12.



20/20

9/10/201

V d: Action Class1.package hansen.playground;





6. ActionForm form,









15.



18. }


bai19 struts basic

Documents