Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 0#`)Prop6
{5 Kz' FT
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Qtnv#9%Vi
EW;1`x
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 3uO8v{`
[0op)Kn
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 CgoXZX
L<E/,IdE
。 poY8
)2
qL>v&Rd<
分页支持类: 'fl(N2t
-$ali[
java代码: ! OfO:L7-
paYz[Xq
Bt6xV<jD
package com.javaeye.common.util; vrO%XvXW
]Da4.s*mW
import java.util.List; +U=KXv
dgY5ccP
publicclass PaginationSupport { ecT]p
s[Gswd
publicfinalstaticint PAGESIZE = 30; }#|2z}!
[k~C+FI
privateint pageSize = PAGESIZE; P,`=]Y*
.)0gz!Z
privateList items; e#m1X6$.e
(-'PD_|
privateint totalCount; ?Hk.|5A}
D9G0k[D,
privateint[] indexes = newint[0]; 85Dm8~
*cQz[S@F
privateint startIndex = 0; "Y(%oJS]D
,L~snR'w
public PaginationSupport(List items, int >E~~7Yal
g6`.qyVfz'
totalCount){ oo'iwq-\
setPageSize(PAGESIZE); |} 9GHjG
setTotalCount(totalCount); qAbd xd[
setItems(items); -rRz@Cr
setStartIndex(0); +ruj
} Ss+F9J
LiF.w:}
public PaginationSupport(List items, int @M9_j{A
>!<V\
Fj1
totalCount, int startIndex){ 0pCDEs
setPageSize(PAGESIZE); m9k2h1
setTotalCount(totalCount); =3pD:L
setItems(items); Lm.Ik}Gli
setStartIndex(startIndex); P1e5uJkd
} ~"\P~cg0J
.;j"+Ef
public PaginationSupport(List items, int /:^tc/5U]
h4h d<,
totalCount, int pageSize, int startIndex){ #W.bZ]&WA
setPageSize(pageSize); L% zuI& q
setTotalCount(totalCount); ?;/{rITP#
setItems(items); 6eOxF8
setStartIndex(startIndex); )biX8yqhR
} |B,dEx/uU
NrW [Q3E$
publicList getItems(){ JfR kp
return items; Zq9>VqGe
} ?9CIWpGjU
Mc.^s
publicvoid setItems(List items){ zcZ^s v>
this.items = items; z{AM2Z
} 2pw>B%1WP)
jw/wcP
publicint getPageSize(){ J511AoQ{R
return pageSize; nWd:>Ur
} "NlRSc#
$F<%Jl7_Z
publicvoid setPageSize(int pageSize){ f)qPFM]%z
this.pageSize = pageSize; @i\7k(9:A
} P%ye$SASd
yM W'-\
publicint getTotalCount(){ =:kiSrBS3t
return totalCount; *:k~g].Iz
} zCyR<as7
vxF:vI# @
publicvoid setTotalCount(int totalCount){ kK08W3@&t
if(totalCount > 0){ T$f:[ye]Z
this.totalCount = totalCount; zv&ePq\#
int count = totalCount / m<~>&mWr
9$8X>T^
pageSize; $]xE$dzJ
if(totalCount % pageSize > 0) "Fo
count++; rE9Ta8j6
indexes = newint[count]; 3{I=.mUUm
for(int i = 0; i < count; i++){ wrhBH;3
indexes = pageSize * &`-_)~5]
#vnefIcBf
i; <d3PDO@w/
} 4,o
%e,z
}else{ `e4o 1*
this.totalCount = 0; ZE{aS4c
} dVij <! Lu
} r{bgTG
D<lQoO+
publicint[] getIndexes(){ oD Q9.t
return indexes; Zjw!In|vC
} 02;f2;I
{(8U8f<'=y
publicvoid setIndexes(int[] indexes){ YWybPD4\(
this.indexes = indexes; >cC Gx
} 721{Ga4~S
v/QEu^C
publicint getStartIndex(){ dw@TbJ
return startIndex; [P (rY
} 9(i0"hS^
&Xj {:s#
publicvoid setStartIndex(int startIndex){ 5)h+(u C3
if(totalCount <= 0) \H},ouU
this.startIndex = 0; B4PW4>GF
elseif(startIndex >= totalCount) g/fp45s
this.startIndex = indexes ly9x1`?$
m
T>b;
[indexes.length - 1]; q}wl_ku9+
elseif(startIndex < 0) gK&5HTo
this.startIndex = 0; %g2/o^c*
else{ !3O,DhH>MC
this.startIndex = indexes *##QXyyg
*C[4 (DmB
[startIndex / pageSize]; ez{P-qB
} Lg\8NtP
} Gsx^j?
>eYU$/80
publicint getNextIndex(){ U^vUdM"
int nextIndex = getStartIndex() + PT
0Qzg
F5:2TEA
pageSize; T)$6H}[c
if(nextIndex >= totalCount) h0'8NvalQ
return getStartIndex(); d m/-}
else ,(1vEE[9-
return nextIndex; (,d4"C
} @]?? +f}#
:mCw.Jz<h
publicint getPreviousIndex(){ LZ=wz.'u
int previousIndex = getStartIndex() - xMO[3D&D
g] 7{5
pageSize; /y+;g{
if(previousIndex < 0) lq7 8gOg{
return0; NgmO0H
else pe`TH::p
return previousIndex; 2tg/S=t}
} GqmDDL1
<-Kb@V3
} y@2vY[)3s
B;Q`vKY
yoq\9* ?u^
YD0vfwh
抽象业务类 (r#5O9|S
java代码: llTQ\7zP
r_!{!i3B
LLXg
/** 2
* Created on 2005-7-12 0{^l2?mgSb
*/ L@d]R MNv
package com.javaeye.common.business; :V5!C$QV
-$sl!%HO%
import java.io.Serializable; K#m\qitb
import java.util.List; iMOPD}`IX
bn<I#ZH2
import org.hibernate.Criteria; !9ceCnwbNN
import org.hibernate.HibernateException; IL8'{<lM
import org.hibernate.Session; i"2J5LLv
import org.hibernate.criterion.DetachedCriteria; @M1yBN
import org.hibernate.criterion.Projections; &Cx yP_
import (FjsN5
14@q $}sf
org.springframework.orm.hibernate3.HibernateCallback; DRKc&F6Qy
import 8S[<[CH
/Gh
x2B
org.springframework.orm.hibernate3.support.HibernateDaoS l\A}lC0?J
".*a)
upport; !DY2{Wb
l"~h1xk~
import com.javaeye.common.util.PaginationSupport; vJ# rW8y
5~ *'>y
public abstract class AbstractManager extends N>F2
c)rm
On2Vf*G@|
HibernateDaoSupport { ~8Dd<4?F]
M;S-ESQ
privateboolean cacheQueries = false; 5W:Gl?$S}
sTYuwna~
privateString queryCacheRegion; U:etcnb4w>
dZ;~b(CA
publicvoid setCacheQueries(boolean #V(Hk )
y<'2BTf
cacheQueries){
bSeL"
this.cacheQueries = cacheQueries; $Nt]${0
} #C=L^cSx(
gs`27Gih
publicvoid setQueryCacheRegion(String FzsS~C$wH{
K_<lO,[S
queryCacheRegion){ Bcd0
this.queryCacheRegion = >gS5[`xRE
;k63RNT,M&
queryCacheRegion; ]
fwTi(4y
} pO 7{3%
4/mj"PBKL
publicvoid save(finalObject entity){ f4aD0.K.g|
getHibernateTemplate().save(entity); F_M~!]<na
} Xx9~
=E6i1x%j
publicvoid persist(finalObject entity){ yoQ?lh
getHibernateTemplate().save(entity); o<Rxt
*B
} ,Rr&.
}ii]cY
publicvoid update(finalObject entity){ J~yd]L>
getHibernateTemplate().update(entity); zM9) .D
H
} 644hQW&W
CB{k;H
publicvoid delete(finalObject entity){ :'^dy%&UB
getHibernateTemplate().delete(entity); +2k|g2
} D .oS8'
?XTg%U
publicObject load(finalClass entity, |]2eGrGj4
/S=;DxZ,r
finalSerializable id){ 2}xFv2X
return getHibernateTemplate().load |Z^c#R
s_Ge22BZ
(entity, id); 1+PNy d
} gp|7{}Q{
_>:=<xyOq
publicObject get(finalClass entity, }mT%N eS
aBA#\eV
finalSerializable id){ GO:1
Z?^
return getHibernateTemplate().get (1r>50Ge
,[K)E
(entity, id); n9-q5X^e>
} zf!\wY"`
o"+&^
publicList findAll(finalClass entity){ WY.\<$7
return getHibernateTemplate().find("from l.NkS
{/|8g(
" + entity.getName()); nD?M;XN
} $0`$)(Y
X-2S*L'
publicList findByNamedQuery(finalString /xm} ?t0U
K&gc5L
namedQuery){ JXR/K=<^
return getHibernateTemplate |yl0}.()
5\*wX.wp
().findByNamedQuery(namedQuery); 2"{]A;@
} |@bNd7=2d
Z@aL"@2]a
publicList findByNamedQuery(finalString query, %>z8:oJ
mLxwJ
finalObject parameter){ r@@eC['
return getHibernateTemplate Drq{)#7
%RD7=Z-z
().findByNamedQuery(query, parameter); : z,vJ~PW
} Jv{"R!e"P
0f#a_
publicList findByNamedQuery(finalString query, <T2~xn
R7;rBEt8
finalObject[] parameters){ ,;ruH^
return getHibernateTemplate BO\`m%8md
Er+3S@sfq,
().findByNamedQuery(query, parameters); H/la'f#o%
} O
|I:[S},
d\<aJOi+-
publicList find(finalString query){ #/sE{jm
return getHibernateTemplate().find 17[t_T&Ak9
M0IqQM57N
(query); >fzzrD}]
} kFZu/HRI
>zx50e)
publicList find(finalString query, finalObject CH_Dat>
h*X%:UbW
parameter){ . eag84_
return getHibernateTemplate().find =`.5b:e
`q{'_\gVt(
(query, parameter); rxK[CDM,
} d~f0]O
9qO:K79|
public PaginationSupport findPageByCriteria rpP+20 v
YHv,Z|.w
(final DetachedCriteria detachedCriteria){ MVU'GHv
return findPageByCriteria U!UX"r
qxCL
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 2d J)4
} .1q~,}toX
3/|{>7]1
public PaginationSupport findPageByCriteria % |Gzht\
&l}xBQAL
(final DetachedCriteria detachedCriteria, finalint T7Qd
I[K%b
X%\6V;zR#
startIndex){ N*)8L[7_;
return findPageByCriteria \]:NOmI^'
ghd[G}
(detachedCriteria, PaginationSupport.PAGESIZE, p){RSq
K.L+;
nQ
startIndex); f%%En5e+
} ump:dL5{
?;7>`F6ld
public PaginationSupport findPageByCriteria f7AJSHe
~9jP++&
(final DetachedCriteria detachedCriteria, finalint RuEnr7gi
6!PX!
UkF
pageSize, w
I
7
finalint startIndex){ ,7nb;$]
return(PaginationSupport) *E q7r>[
0J,d9a [1
getHibernateTemplate().execute(new HibernateCallback(){ G/;aZ
publicObject doInHibernate zgOwSg8
.xQ'^P_q
(Session session)throws HibernateException { M@ZpgAfq
Criteria criteria = E0%Y%PQ**{
jl%eO.
detachedCriteria.getExecutableCriteria(session); ?BZ`mrH^
int totalCount = X1QZEl
k#G7`dJl
((Integer) criteria.setProjection(Projections.rowCount (dnc7KrM
QL!+.y%
()).uniqueResult()).intValue(); ;xC~{O
criteria.setProjection HQj4h]O#
/faP]J)
(null); :v ~q
List items = ~l(tl[
}(IDPaJ
criteria.setFirstResult(startIndex).setMaxResults BJ2W}R
&IY_z0=
(pageSize).list(); '"p*FN
PaginationSupport ps = | Dpfh
otVdx&%]
new PaginationSupport(items, totalCount, pageSize, 8pt<)Rs}
FQRcZpv;
startIndex); MM$"6Jor
return ps;
:@'0)7
} tF1%=&ss
}, true); wDY7B
} gxtbu$
tdK^X1
public List findAllByCriteria(final +W[#;)ea(
:u+#:8u
DetachedCriteria detachedCriteria){ <G =@Gl
return(List) getHibernateTemplate 9uoj3Rh<
B>21A9&
().execute(new HibernateCallback(){ 5!fW&OiY
publicObject doInHibernate vyy\^nL
ITPpT
(Session session)throws HibernateException { JNCtsfd
Criteria criteria = w:(7fu=
-zkL)<7
detachedCriteria.getExecutableCriteria(session); ``CADiM:S
return criteria.list(); vK~KeZ\,p=
} 4?uG> ;V
}, true); wA&)y>n-
} Y\S^DJy
iFchD\E*o
public int getCountByCriteria(final UHHKI)(
k}qiIMdI
DetachedCriteria detachedCriteria){ hvZR4|k>
Integer count = (Integer) CUcjJ|MZ
%E_{L
getHibernateTemplate().execute(new HibernateCallback(){ @y&,e,3!
publicObject doInHibernate =x]dP.
rs+37
(Session session)throws HibernateException { 1D DOUV
Criteria criteria = 8Y'"=!3
{-qTU6
detachedCriteria.getExecutableCriteria(session); k=
1+mG
return Jtk(yp{Zz
H43D=N&
criteria.setProjection(Projections.rowCount ,6pH *b$
Xh!Pg)|E
()).uniqueResult(); 'mR+W{r
} wajhFBJ
}, true); ?"u-@E[m
return count.intValue(); Ux]@prA q
} 1yc@q8
}
>ON.ftZi
&$im^0`r_
Rj=Om
DlO;EH
(LPD
S`.-D+.68
用户在web层构造查询条件detachedCriteria,和可选的 F\72^,0
I ^92b
startIndex,调用业务bean的相应findByCriteria方法,返回一个 F'*4:WD7
- mXr6R?
PaginationSupport的实例ps。 {mGWMv
n/D]r
ps.getItems()得到已分页好的结果集 4tTJE<y
ps.getIndexes()得到分页索引的数组 M lwQ_5O
ps.getTotalCount()得到总结果数 9x,+G['Zt
ps.getStartIndex()当前分页索引 )5x?Qn (B
ps.getNextIndex()下一页索引 zf u78
ps.getPreviousIndex()上一页索引 MqH~L?~}|
(P8oXb+%
&i RX-)^u
Wno5B/V
\ }f*
q>X2=&1
D3ad2vH
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 4F!d V;"Z(
1A`";E&
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 (0f^Hh wF
R0'EoX
一下代码重构了。 ?>&Zm$5V
M+:wa@Kl
我把原本我的做法也提供出来供大家讨论吧: t68RWzqiG[
1fZ:^|\
首先,为了实现分页查询,我封装了一个Page类: 1YL5 ![T
java代码: bux-t3g7+
L;`t%1
K4~Ox
/*Created on 2005-4-14*/ 5Bo)j_Qo
package org.flyware.util.page; Fwqf4&/
9f`Pi:*+/
/** yjzNU5F
* @author Joa Xi.?9J`@
* ]+P&Y:
*/ W9"I++~f
publicclass Page { =ndKG5
ak[)+_k_
/** imply if the page has previous page */ TVA1FD
privateboolean hasPrePage; O6]~5&8U.
W[s>TDc`v
/** imply if the page has next page */ AF6'JxG7
privateboolean hasNextPage; ba13^;fm#
g!ww;_
/** the number of every page */ cK&oC$[r-
privateint everyPage; ibyA~YUN/
%\0 Y1!Hw
/** the total page number */ qZe"'"3M
privateint totalPage; VWa(@A
Y{=@^4|]
/** the number of current page */ =d}3>YHS
privateint currentPage; v!Z 9T
CgC wM=!r
/** the begin index of the records by the current 4aC#Cv:0
ZD(gYNi
query */
U,BBC
privateint beginIndex; `>Cx!sYhV
>^&+,*tsS4
KJ_R@,v\
/** The default constructor */ l.$#IE
public Page(){ T!bu}KO
se[};t:
} m@YLZ
r;z A `
/** construct the page by everyPage 5,C,q%2
* @param everyPage -wB AFr
* */ o*_ D
public Page(int everyPage){ 5mU_S\)4:z
this.everyPage = everyPage; ^> fs
} "L]_NST
`Z-`-IL
/** The whole constructor */ j$6}r
public Page(boolean hasPrePage, boolean hasNextPage, WmA578|l!
<X?F :?Mk
}JD(e}8$!
int everyPage, int totalPage, Npqb xb
int currentPage, int beginIndex){ %:*HzYf
this.hasPrePage = hasPrePage; 32yNEP{
this.hasNextPage = hasNextPage; eORt
qX8*
this.everyPage = everyPage; _q 8m$4
this.totalPage = totalPage; @^Oww(I
this.currentPage = currentPage; N"TD$NrK\
this.beginIndex = beginIndex; '#PT C,0UJ
} uZ+<
zlfm})+G
/** PBmt.yF
* @return 0*)79Sz
* Returns the beginIndex.
U{EW +>
*/ 4%TC2Laii
publicint getBeginIndex(){ (P ?9Jct
return beginIndex; T (qu~}
}
cO:x{~
{\B!Rjt[T
/** %[J( ,rm
* @param beginIndex |{
kB`
* The beginIndex to set. iwbjjQPr
*/ V~;YV]1Y
publicvoid setBeginIndex(int beginIndex){ S4w/
kml3
this.beginIndex = beginIndex; VZ8L9h<{"
} ,P}c92;
qb Q> z+c
/** Ero3A'f
* @return o#i{/#oF
* Returns the currentPage. (rJvE*
*/ Gkl#s7'
publicint getCurrentPage(){ Ot?rsr
return currentPage; fOVRtSls
} z?PF9QL1
B !XT:.+
/** }49?Z 3
* @param currentPage uyj5}F+O
* The currentPage to set. ;c`B'
*/ b7-a0zaN
publicvoid setCurrentPage(int currentPage){ )l=j,4nn
this.currentPage = currentPage; -8IiQRS
} v,jU9D\
J?&9ofj&
/** 4P8:aZM
* @return y;;@T X
* Returns the everyPage.
:9<5GF(
*/ L-XTIL$$
publicint getEveryPage(){ S'txY\
return everyPage; R`c5-0A
} 4T:ZEvdzf
Sz
=z
TPnO
/** <*[(t;i
* @param everyPage %X3T<3<
* The everyPage to set. D<MtLwH
*/ &b_duWs
publicvoid setEveryPage(int everyPage){ "k.<" pf
this.everyPage = everyPage; jzQgDed ]
} 1n^xVk-G
~L2Fo~fw
/** KnuqU2<
{
* @return SC#
* Returns the hasNextPage. Vh&uSi1V
*/ 99`xY$
publicboolean getHasNextPage(){ c0@v`-9
return hasNextPage; e*tOXXY1
} r<U }lK
MStaP;|
/** ek9%Xk8
* @param hasNextPage e.N#+
* The hasNextPage to set. BsJClKp/
*/ uZfo[_g0S
publicvoid setHasNextPage(boolean hasNextPage){ j0J6ySlY
this.hasNextPage = hasNextPage; QZX+E
} WDcjj1`l
~Y{K^:wN^
/** ~%]+5^Ka]
* @return O_~\$b
* Returns the hasPrePage. v"`w'+
*/ -{dwLl_
publicboolean getHasPrePage(){ 7*sB"_U2
return hasPrePage; Qi9SN00F.
} RW'QU`N[Y
zR%#Q_
/** JH 8^ZP:d'
* @param hasPrePage r;-\z(h
* The hasPrePage to set. @ Fu|et
*/ #(%6urd
publicvoid setHasPrePage(boolean hasPrePage){ QgP
UP[
this.hasPrePage = hasPrePage; ='(:fHhhX
} Z',pQ{rD
7>#74oy
/** d4lEd>Ni
* @return Returns the totalPage. N)QW$iw9
* @sP?@<C
*/ Hg]r5Fe/c
publicint getTotalPage(){ xT%CY(:9X
return totalPage; )Ipa5i>t
} $(BW |Pc
DUaj]V{_^
/** KyjN' F$
* @param totalPage 0ZO!_3m$r
* The totalPage to set. /0A}N$?>:
*/ V[#jrwhA
publicvoid setTotalPage(int totalPage){ 7a2uNt,X
this.totalPage = totalPage; _f/6bpv
} biQDupTz
D_g+O"];P
} [j):2
-{^Gzui
vForj*Xo
b^0=X!bg
<%!EI@N
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 {Wt=NI?Ow
m}rUc29cS,
个PageUtil,负责对Page对象进行构造: XOU
9r(
java代码:
4h-tR
O9bIo]B
"5=Gu1
/*Created on 2005-4-14*/ @I9A"4Im
package org.flyware.util.page; ,#nyEE
5-*/wKjLz
import org.apache.commons.logging.Log; Vf0m7BJc3
import org.apache.commons.logging.LogFactory; }5EvBEv-)
_qr?v=,-A
/** s_/CJ6s
* @author Joa :U=*@p4?
* dW6sA65<Y
*/ MGK%F#PM
publicclass PageUtil { T)MKhK9\Ab
k*J0K=U|
privatestaticfinal Log logger = LogFactory.getLog d-y8c
V!uW\i/
(PageUtil.class); nwf(`=TC
(V&$KDOA
/** xtyOG
* Use the origin page to create a new page ^tI
,eZ
* @param page `Ps&N^[
* @param totalRecords U<K)'l6#2n
* @return c1Skt
*/ =nGgk}Z
publicstatic Page createPage(Page page, int ,XU<2jv]
H>X:#xOA_
totalRecords){ 1
Qln|b8<
return createPage(page.getEveryPage(), zt6GJz1q
+xp)la.
page.getCurrentPage(), totalRecords); m9 1Gc?c
} @kd`9Yw
:>f}rq
/** /@ m]@
* the basic page utils not including exception -V7dSi
z#m ~}
handler wt]onve}%
* @param everyPage Z):q 1:y
* @param currentPage MR}=tO
* @param totalRecords ~7ZWtg;B
* @return page x. 8fxogz
*/ e w?4;
publicstatic Page createPage(int everyPage, int L xP%o
Y'*oW+K
currentPage, int totalRecords){ &.F]-1RN[
everyPage = getEveryPage(everyPage); f}=>c|Do
currentPage = getCurrentPage(currentPage); H}?"2jF
int beginIndex = getBeginIndex(everyPage, id+ ~ V
R.(PZC vS
currentPage); Qco8m4n
int totalPage = getTotalPage(everyPage, F$M^}vsjGx
pLSh
+*F
totalRecords); FJCs$0
boolean hasNextPage = hasNextPage(currentPage, 7H.3.j(L
H\RejGR
totalPage); Ym% XCl
boolean hasPrePage = hasPrePage(currentPage); g-? @a
@Z.BYC
returnnew Page(hasPrePage, hasNextPage, 42M_ %l_
everyPage, totalPage, 41g
"7Mk
currentPage, z.lIlp2:
=U'!<w<-
beginIndex); 9k/L m
} AO,
o|,#4F
S#kYPe
privatestaticint getEveryPage(int everyPage){ 9:R3+,ZN
return everyPage == 0 ? 10 : everyPage; ncrg`<'/,
} Uo?4o*}
qF\w#nG
privatestaticint getCurrentPage(int currentPage){ /z!Tgs4
return currentPage == 0 ? 1 : currentPage; r3qKT
} PzOnS
rU+3~|m
privatestaticint getBeginIndex(int everyPage, int MX? *jYl
?8N^jjG
currentPage){ SSxp!E'
return(currentPage - 1) * everyPage; ,.Lwtp,n
} DSQ2|{
9TX2h0U?
privatestaticint getTotalPage(int everyPage, int LAkBf
PriLV4?
totalRecords){ @Bds0t
int totalPage = 0; {7jl) x3l
X$e*s\4
if(totalRecords % everyPage == 0) !0dQfj^_
totalPage = totalRecords / everyPage; i-PK59VZ8f
else =^1jVaAL
totalPage = totalRecords / everyPage + 1 ; EQN)y27poW
eAmI~oku
return totalPage; {0~\ T[qm
} u@1 2:U$
9 ,:#Q<UM
privatestaticboolean hasPrePage(int currentPage){ k@
<dru
return currentPage == 1 ? false : true; -L+kt_>
} ,OWk[0/
UB/"&I uo
privatestaticboolean hasNextPage(int currentPage, h4jo<yp\
v4<W57oH
int totalPage){ elAWQE us
return currentPage == totalPage || totalPage == !B 4z U:d
F ei5'
0 ? false : true; $C.a@gm
} Mgr?D
"\i H/
r4pX47H
} d(|q&b:
q>Di|5<y
3m= _a
l]4=W<N
$33E-^
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 $TfB72
(?m{G Q
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 2TUV9Z
& XmaGtt
做法如下: f";pfu_FZ
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 ;89kL]
8T1zL.u>q
的信息,和一个结果集List: VcGl8~#9
java代码: >ei~:z]R
>MJ#|vO
E447'aJ
/*Created on 2005-6-13*/ +q'\rpt
package com.adt.bo; ?h6|N%U'
'y\Je7
import java.util.List; ?HJh;96B
j*@@H6G
import org.flyware.util.page.Page; jB8Q% {%
ele@xl
/** TKM^
* @author Joa 4^uSW&`;/
*/ E{EO9EI
publicclass Result { KJRAW]?{
& ?x R
private Page page; Gsv<Rjj:
lhHH|~t0
private List content; ydy TDn
g]lEG>y1R
/** p;>A:i
* The default constructor u
[._RA
*/ &nP0T-T5y
public Result(){ T/\RViG3
super(); y QClq{A
} x>}ml\R
=nHKTB>
/** iP0m1
* The constructor using fields iI{L>
* q)i %*IY
* @param page ?D6uviQg
* @param content 6LBdTnzUd
*/
jd](m:eG
public Result(Page page, List content){ \= v.$u"c
this.page = page; Hl,{4%]
this.content = content; >=[uLY[aK
} eJ99 W=
hE|P|0U,n
/** .Q%Hi7JMi
* @return Returns the content. ,c4HicRJ#
*/ ~f h
publicList getContent(){ 4p,:}h
return content; y6nP=g|')>
} 0n{.96r0R
RNi%6A1
/** \IE![=p\w
* @return Returns the page. -NXxxK
*/ !HvA5'|:}
public Page getPage(){ pR$(V4>
return page; 1Ng+mT
} U?#wWbE1
P9/ (f$ =
/** ^ +SE_ -+]
* @param content I.n,TJoz4J
* The content to set. xvV";o
*/ BM<q;;pO
public void setContent(List content){ SXk.7bMV6
this.content = content; eR$@Q
} rP:g`?*V
e0TYHr)X>3
/** }:0_%=)N<
* @param page ob\-OMNs@
* The page to set. K6kz{R%`
*/ inWLIXC,
publicvoid setPage(Page page){ --WQr]U/
this.page = page; /K#k_k
} I8Aq8XBw
} _~z
oMdT!
*4}_2"[
Co1d44Q
VBX)xQazU
C^L+R7
2. 编写业务逻辑接口,并实现它(UserManager, M]s\F(*ib
pR61bl)
UserManagerImpl) wtw=RA
java代码: w"v!+~/9
r{;NGQYs
BS9VwG<Z
/*Created on 2005-7-15*/ 7%y$^B7{
package com.adt.service; $ln8Cpbca
ib=)N)l
import net.sf.hibernate.HibernateException; Dh8ECy5k<*
gQ_<;'m)2
import org.flyware.util.page.Page; )2&3D"V
tm+*ik=x|
import com.adt.bo.Result; hzo> :U
G?s9c0f
/** o;$xN3f,
* @author Joa 'JOUx_@z
*/ ;7'O=%
publicinterface UserManager { KqK]R6>
Ymz/:
public Result listUser(Page page)throws gJQ#j~'
:W.H#@'(
HibernateException; O] @E8<?^
lq-KM8j
} &t=:xVn-M
w"j>^#8
|V a:*3u
~CNB3r5R
@G4Z
java代码: ], lLDUZ\
C%z)D1-
Tqt-zX|>
/*Created on 2005-7-15*/ "w:h
package com.adt.service.impl; 8ymdg\I+L
BJjic% V
import java.util.List; ,"EaZ/Bl/
2lTt
import net.sf.hibernate.HibernateException; }J# HIE\RG
]l,D,d81
import org.flyware.util.page.Page; "t0^4=c+7
import org.flyware.util.page.PageUtil; zjmoIE
P~j#8cH7
import com.adt.bo.Result; Bgxk>Y
import com.adt.dao.UserDAO; 8 0tA5AP
import com.adt.exception.ObjectNotFoundException; sY;h~a0n
import com.adt.service.UserManager; riIubX#
0~U#DTx0
/** \D@j`o
* @author Joa Z[#8F&QV!m
*/ Z)7{~xq
publicclass UserManagerImpl implements UserManager { &qx/ZT
9hzu!}~'I
private UserDAO userDAO; p:~#(/GWf
~P\4
N
/** %Psg53N
* @param userDAO The userDAO to set. ~su>RolaX
*/ }>{R<[I!G
publicvoid setUserDAO(UserDAO userDAO){ w){B$X
this.userDAO = userDAO; hIV9 .{J
} LeCc`x,5
rS [4Pey
/* (non-Javadoc) *j3U+HV
* @see com.adt.service.UserManager#listUser 'gY?=,dF>
\@@ G\\)er
(org.flyware.util.page.Page) "yu{b]AU
*/ A[l
)>:
public Result listUser(Page page)throws "9;
2+&