Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 AF
QnCl Of
R+x%r&L5F
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 iiQ||P}5
^$6bs64FSm
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来
bsD'\
#d$d&W~gE
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 F^[M
^>t-v
。 YU*46 hA1B
r)(i{:@r`
分页支持类: X%*brl$D
S/)
java代码: Ho:}Bn
g
}.w#X
>n#g9v K
package com.javaeye.common.util; FC~|&
18J.vcP
import java.util.List; JJ*0M(GG
XC57];-
publicclass PaginationSupport { U8Cw7u2
pC55Ec<
publicfinalstaticint PAGESIZE = 30; lxr@[VQ
1\=pPys)
privateint pageSize = PAGESIZE; R20a(4m
56VE[G
privateList items; lu<Np9/5<
{8ld:ZP
privateint totalCount; 1Qrm"TFo
+D6-m
privateint[] indexes = newint[0]; zvWO4\
zS,%msT^A
privateint startIndex = 0; ]i9H_K
8Q#t\$RY
public PaginationSupport(List items, int 4Q&Xb <
^Osd/g
totalCount){ WXRHG)nvL
setPageSize(PAGESIZE); \5j22L9S
setTotalCount(totalCount); D>,$c
setItems(items); Oct\He\.
setStartIndex(0); +5N^TnBtBL
} '33Yl+h
ZA 99vO
public PaginationSupport(List items, int ./aZV
,.1&Ff)S
totalCount, int startIndex){ h$:&1jVY{
setPageSize(PAGESIZE); NzwGc+\7}
setTotalCount(totalCount); WVBE>TB
setItems(items); =rs=8Ty?S
setStartIndex(startIndex); Q_UCF'f;}
} z22|Kv;w
q70YNk}
public PaginationSupport(List items, int .q~,.yI&j
6c;?`C
totalCount, int pageSize, int startIndex){ uv_P{%TK
setPageSize(pageSize); g&5pfrC [
setTotalCount(totalCount); iq[2H$
setItems(items); 3P<Zzt%e T
setStartIndex(startIndex); s\n,Z?m
} x1 R!
q]wn:%rX
publicList getItems(){ ! X#3w-K
return items; 7Vof7Y <
} )PLc+J.I
x u\/]f)
publicvoid setItems(List items){ cZ7F1H~
this.items = items; fmT3Afl5c
} XEe+&VQmY
e[|p0 ,Q
publicint getPageSize(){ o@Cn_p^X
return pageSize; S^sW.(I
} BGk<NEzH
uDMUy"8&!
publicvoid setPageSize(int pageSize){ Vq;{+j(
this.pageSize = pageSize; 1v8:,!C
} V!aC#^
*+1"S ]YF
publicint getTotalCount(){ Lqf#,J
return totalCount; 1 _:1/~R1
} #,|_d>p:
_sD]Viqc
publicvoid setTotalCount(int totalCount){ 30T:* I|
if(totalCount > 0){ lhvZ*[[<)
this.totalCount = totalCount; e]L3=R;
int count = totalCount / [.yx2@W
4UX]S\X
pageSize; SBB
bniK-
if(totalCount % pageSize > 0) ;*$8iwBQ_
count++; /%@RO^P
indexes = newint[count]; ^9m]KEucd7
for(int i = 0; i < count; i++){ HT;QepY3
indexes = pageSize * )]e d;V
]ge^J3az$u
i; T_|fb)G+{
} aDJjVD
}else{ '/]Aaf@U8
this.totalCount = 0; vpr@
} VL,?91qwe
} GlkAJe]
(H|d 3
publicint[] getIndexes(){ $hY]EB
return indexes; nQ(:7PFa'
} @'| 6lG
\crb&EgID
publicvoid setIndexes(int[] indexes){ UBk
5O&
this.indexes = indexes; Y_iF$m/R
} d'@H@
z_iyuLRdb
publicint getStartIndex(){ HW%bx"r+4f
return startIndex; 7-0twq
} *V<2\-
KcyM2hE7
publicvoid setStartIndex(int startIndex){ n[p9$W`
if(totalCount <= 0) j*lWi0Z-
this.startIndex = 0; _ .
elseif(startIndex >= totalCount) ^=M(K ''
this.startIndex = indexes VH1c)FI
Ta5iY
}
[indexes.length - 1]; vh{1u
elseif(startIndex < 0) lSsFI30
this.startIndex = 0; \YF!< 2|[
else{ E$zq8-p|
this.startIndex = indexes F$.s6Hh.
tf}Q%)`f
[startIndex / pageSize]; )o(F*v
} nf@u7*#6
} ?fX8WRdh
xM"XNT6b
publicint getNextIndex(){ v7I*W/
int nextIndex = getStartIndex() + oUS>p" :
Dve5m=
pageSize; p:n^c5
if(nextIndex >= totalCount) hp%Pg &
return getStartIndex(); ;,hoX6D$
else &WV 9%fI
return nextIndex; SPm5tU
} #AnSjl
*LQY6=H
publicint getPreviousIndex(){ @Sd:]h:f-
int previousIndex = getStartIndex() - . T>}O0L"
S#z8H+'
pageSize; 31\^9w__8
if(previousIndex < 0) q`K-T_<
return0; Nm.>C4
else P`v~L;f
return previousIndex; oYM3$.{E
} Xr;noV-X
&H>dE]Hq,
} $
T_EsnN
7VBw@Rh
;5_S
S.4YC>E
抽象业务类 6KTY`'I
java代码: +Y[+2=lO
/Day5\Q#
vw6FvE`lC
/** -$ft `Ih
* Created on 2005-7-12 W"@lFUi
*/ AWNd(B2o
package com.javaeye.common.business; HwK "qq-
mR@Xt#
import java.io.Serializable; G* 6<pp
import java.util.List; <TuSU[]
.ai9PsZ?V
import org.hibernate.Criteria; >Tx;<G
import org.hibernate.HibernateException; Br!&Y9
import org.hibernate.Session; j( :A
import org.hibernate.criterion.DetachedCriteria; _Q}z 6+_\
import org.hibernate.criterion.Projections; >u2#<k]1&
import C(Y6t1
7rg[5hP T
org.springframework.orm.hibernate3.HibernateCallback; a~"X.xT\R
import 7T Bo*-!
c[7qnSH
org.springframework.orm.hibernate3.support.HibernateDaoS 8hp]+k_y
pwC/&bu
upport; 0E[Se|!
[DEw:%
import com.javaeye.common.util.PaginationSupport; ge8zh/`
(Mh\!rMg
public abstract class AbstractManager extends !m2k0|9
'b,D;'v
HibernateDaoSupport { !Esiq<Yh
h`j gF
privateboolean cacheQueries = false; {`Z)'G\`
<k5~z(
privateString queryCacheRegion; /B7
GH5
`s $@6r$
publicvoid setCacheQueries(boolean ]H[\~J
A-$BB=Ot
cacheQueries){ T5;D0tM/
this.cacheQueries = cacheQueries; 7 '/&mX>
} P|U>(9;P,
<i|+p1t
publicvoid setQueryCacheRegion(String GAlO<Mu
}tPl?P'`
queryCacheRegion){ ^D|c
this.queryCacheRegion = '*;rm*n
9g"H9)EZ^
queryCacheRegion; 0oMMJ6"i
} '3VrHL@@g
Vp$ckr
publicvoid save(finalObject entity){ ;4IP7$3G
getHibernateTemplate().save(entity); D>Z_N?iR
} bJD"&h5
AtOB'=ph*
publicvoid persist(finalObject entity){ V'$
eun
getHibernateTemplate().save(entity); H>]x<#uz)
} /'(P{O>{j
?6bE!36
publicvoid update(finalObject entity){ ^l,Jbt
getHibernateTemplate().update(entity); 5UbVg
} zU%aobZ
.YkKIei
publicvoid delete(finalObject entity){ 7>LhXC
getHibernateTemplate().delete(entity); Su7?-vY
} tWFJx}H
{TNAK%'v
publicObject load(finalClass entity, A VjtK
ajAEGD2Zq
finalSerializable id){ C&T3vM
return getHibernateTemplate().load c#DTL/8"DO
~gc)Ww0(Q
(entity, id); :Us-^zVr
} pqK3u)
(ni$wjq=z^
publicObject get(finalClass entity, 9maw+ c!~
`dK\VK^
finalSerializable id){ =bzTfki
return getHibernateTemplate().get L[K_!^MZ
,]MX&]
(entity, id); a_yV*N`D
} lVdExR>H
-~q]0>
publicList findAll(finalClass entity){ /iK )tl|X
return getHibernateTemplate().find("from TwN8|ibVmP
P/Zo
" + entity.getName()); 5c#L6 dA)
} *;m721#
<O WPG,
publicList findByNamedQuery(finalString 2I7P}=
!m;VWGl*
namedQuery){ yZ{YIy~
return getHibernateTemplate j405G4BVW
}oG&zw
().findByNamedQuery(namedQuery); =pNkS1ey
} oAL-v428
{1Qwwhov
publicList findByNamedQuery(finalString query, (<CLftQKg
zehF/HBzE
finalObject parameter){ s|%</fMt9
return getHibernateTemplate #k6;~
ubLLhf
().findByNamedQuery(query, parameter); iY2bRXA
} L*Y}pO
g#AA.@/Z
publicList findByNamedQuery(finalString query, EW`3h9v~
efhwbn
finalObject[] parameters){ -[F^~Gv|;
return getHibernateTemplate =Yfs=+O
Gd"*mLd
().findByNamedQuery(query, parameters); W%P&o}'
} g41LpplX
| @YN\g K;
publicList find(finalString query){ Np<Aak
return getHibernateTemplate().find d_`Ze.^
JG_7G=~
(query); CtfSfSAUuu
} @l?%]%v|
mVkn~LD:0
publicList find(finalString query, finalObject M3Z yf
fZZ!kea[
parameter){ *w _j;
return getHibernateTemplate().find 23=;v@
TnG"_VK9R
(query, parameter); }PXWRv.gW
} a'\`Mi@rb
2PC4EjkC
public PaginationSupport findPageByCriteria H)p{T@
\yy!?UlaI
(final DetachedCriteria detachedCriteria){ uYl ?Q
return findPageByCriteria h {m]n!
[bcqaT
(detachedCriteria, PaginationSupport.PAGESIZE, 0); <Z&gAqj 2
} k\[2o
}$o%^"[
public PaginationSupport findPageByCriteria V_~wWuZ-
/L~*FQQK>
(final DetachedCriteria detachedCriteria, finalint sJD"u4#y
'!0CwZ
7
startIndex){ A=])pYE1
return findPageByCriteria BgRiJFa.d[
'%MIG88
(detachedCriteria, PaginationSupport.PAGESIZE, b,'./{c0
o ).pF">jh
startIndex); &dS+!<3
} *be+x RY
-LY_7Kg
public PaginationSupport findPageByCriteria "Vh(%N`6
#4Z$O(
(final DetachedCriteria detachedCriteria, finalint 6y0C
GwvxX&P
pageSize, g(`6cY[}
finalint startIndex){ N >z8\y
return(PaginationSupport) q&M;rIo?
[L275]4n!]
getHibernateTemplate().execute(new HibernateCallback(){ O+yR+aXr'8
publicObject doInHibernate ,Q:dAe[ZsX
Uag1vW,c
(Session session)throws HibernateException { lC2xl( #!
Criteria criteria = ]uZH 0
lojn8uL
detachedCriteria.getExecutableCriteria(session); f8j^a?d|
int totalCount = m&\Gz*)3
?-VN+
d7
((Integer) criteria.setProjection(Projections.rowCount Gnw>%f1@u
$DVy$)a!u
()).uniqueResult()).intValue(); ,t[D1KZt
criteria.setProjection }_;nln?t(
u>E+HxUJ
(null); ^Nu} HcC+
List items = W6PGv1iaW>
ZQ:Y5ph
criteria.setFirstResult(startIndex).setMaxResults B^qB6:\t
-7`J(f.rYC
(pageSize).list(); aJF`rLm
PaginationSupport ps = k8ck#%#}Wu
v!uLd.(
new PaginationSupport(items, totalCount, pageSize, y6s$.93
+u#x[xO
startIndex); ;CW$/^QNr5
return ps; @|@43}M]C-
} BO_^3Me*
}, true); WIghP5% W
} =VU2# O
"&%Hb's
public List findAllByCriteria(final r3kI'I|bq
jDnh/k0{d
DetachedCriteria detachedCriteria){ V;V9_qP,
return(List) getHibernateTemplate 4L0LT>'M\
)\(pDn$W
().execute(new HibernateCallback(){ #&Ee5xM=
publicObject doInHibernate tFwlx3
OrBFe *2y
(Session session)throws HibernateException { %9lxE[/
Criteria criteria = +M*a.ra0OF
hD*?\bBs0
detachedCriteria.getExecutableCriteria(session); DH^^$)
return criteria.list(); fCfY.vd5
} NO$Nl/XM
}, true); h2>0#Vp3j
} %c0;Bb-
^kq! /c3r
public int getCountByCriteria(final G!\xc
(0+m&,
z
DetachedCriteria detachedCriteria){ eG v"&kr
Integer count = (Integer) m+g>s&1H
3Z0\I\E
getHibernateTemplate().execute(new HibernateCallback(){ 93\,m+-
publicObject doInHibernate D\R^*k@V
?KN_J
(Session session)throws HibernateException { f/yK|[g~
Criteria criteria = +[ zo2lBx
p!ErH]lH
detachedCriteria.getExecutableCriteria(session); wu')Q/v
return *QG;KJ%
0YL0Oa+7
criteria.setProjection(Projections.rowCount i`qh|w/b_
0=B5
=qyw
()).uniqueResult(); Fn,|J[sC
} bRp[N
}, true); ui1m+
return count.intValue(); ks D1NB;9
} $b} +5
} B}X#oA
/`> P|J
`t6L'%\
4(82dmKO
j`B{w
V{{x~Q9
用户在web层构造查询条件detachedCriteria,和可选的 DF2&j!
<.ky1aex7
startIndex,调用业务bean的相应findByCriteria方法,返回一个 \`ReZu$
=Qrz|$_rv
PaginationSupport的实例ps。 x3|'jmg
Qs:r@"hE
ps.getItems()得到已分页好的结果集 hT"K}d;X
ps.getIndexes()得到分页索引的数组 ".f:R9-
ps.getTotalCount()得到总结果数 5eA]7$ic
ps.getStartIndex()当前分页索引 MVZ>:G9:
ps.getNextIndex()下一页索引 +ctv]'P_
ps.getPreviousIndex()上一页索引 7`HUwu
,~(}lvqVH
<>_WdAOuD
+;;%Atgn
B_glyC
2]=I'U<E!
Xkom@F~]
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 *(B[J
-FV'%X$i
,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 u^%')Ncp
@l Gn G
一下代码重构了。 Ws)X5C=A
ZGhoV#T@
我把原本我的做法也提供出来供大家讨论吧: =hIT?Z6A
"B3:m-'
首先,为了实现分页查询,我封装了一个Page类: -i5g 8t'
java代码: L]N2rMM
&> .1%x@R
q-
(NZno
/*Created on 2005-4-14*/ -Jo :+].
package org.flyware.util.page; N09+id g
myOX:K*
/** FNCLGAiZ
* @author Joa /(ju
* O>M*mTM
*/ % W',c u
publicclass Page { ESjJHZoD(
:;q_f+U
/** imply if the page has previous page */ y6jmn1K
privateboolean hasPrePage; jI`To%^Y
)-KE 4/G
/** imply if the page has next page */ }"B? 8T@_~
privateboolean hasNextPage; }9udo,RWu
vLFaZ^(
/** the number of every page */ &9w%n
privateint everyPage; _JJKbi
bL],KW;Q
/** the total page number */ 0$ 9;pzr
privateint totalPage; [S&O-b8A
3k*:B~1
/** the number of current page */ xT?} wF
privateint currentPage; `}8@[iB'
dwbY"t[9
/** the begin index of the records by the current k-cIb@+"
P,;b'-5C
query */ NQiecxvt=
privateint beginIndex; hf+/kc!>i
pY!dG-;
+>:_kE]?nX
/** The default constructor */ =#Cf5s6qt
public Page(){ 4 ^~zN"6]
CpRu*w{
} fJ&<iD)6
r5!x,{E6
/** construct the page by everyPage RnA&-\|*
* @param everyPage <m/b]|
* */ yEpN,A
public Page(int everyPage){ nl-t<#z[
this.everyPage = everyPage; %V <F<
} 3aE[F f[
"gbnLKs
/** The whole constructor */ Fi?Q
4b
public Page(boolean hasPrePage, boolean hasNextPage, zJuRth)(,
/,Dwu?Lcqp
A|taP$%
int everyPage, int totalPage, v(Bp1~PPZM
int currentPage, int beginIndex){ juYA`:qE&
this.hasPrePage = hasPrePage; J|"nwY}a9
this.hasNextPage = hasNextPage; o[6vxTH
this.everyPage = everyPage; /nY).lSH
this.totalPage = totalPage; qb-2QPEB
this.currentPage = currentPage; AFINm%\/0
this.beginIndex = beginIndex; gY>;|),
} 8!uL-_ Bn
VA=#0w
/** ovQS
ET18b
* @return Q3BLL`W~
* Returns the beginIndex. 49xp2{
*/ 9 wSl,B-
publicint getBeginIndex(){ A#Q0{z@H
return beginIndex; tKG;k"wk
} /63W\
L,b|Iq
/** h9<mThvgn
* @param beginIndex XN~#gm#
* The beginIndex to set. ~+pg^en
*/ %z-dM` i
publicvoid setBeginIndex(int beginIndex){ VMxYZkMNd_
this.beginIndex = beginIndex; MtZt8s
} qPXANx<^
aQ!9#d_D
/** pAJ=f}",]E
* @return Wj&<"Z6'm(
* Returns the currentPage. CF3E]dt
*/ 2!{_/@I\Y
publicint getCurrentPage(){ 69[V <1
return currentPage; wUZQB1$F
} ERp:EZ'
$kxu;I
/** q4sl=`L5Sp
* @param currentPage $xRo<,OV+
* The currentPage to set. 6-*~t8
*/ \3t,|%v
publicvoid setCurrentPage(int currentPage){ QO5OnYh
this.currentPage = currentPage; _L*f8e8
} PU^[HC*K
SW,q}-
/** tv 4s12&
* @return Rz.i/wg}
* Returns the everyPage. H/^~<U#p
*/ 5h|'DOx|o
publicint getEveryPage(){ sTd}cP
return everyPage; _wm~}_Q
} 2-8YSHlh
'is,^q:@
/** R&NpdW N
* @param everyPage t*o7,
* The everyPage to set. m5e\rMN~>\
*/ -`-ACWeNV
publicvoid setEveryPage(int everyPage){
AGh~8[
this.everyPage = everyPage; xh{mca>?G
} AU0$A403
_TZW|Dh-2F
/** ~J%R-{U9
* @return d>YmKTk"
* Returns the hasNextPage. IgLVn<5n
*/ 6eD(dZ
publicboolean getHasNextPage(){ 0FG5_t"",\
return hasNextPage; jVX._bEGX
} uPFRh~ (b
f8^"E $"
/** >-VWm
A
* @param hasNextPage HvAE,0N
* The hasNextPage to set. M,&tA1CH
*/ )qbI{^_g
publicvoid setHasNextPage(boolean hasNextPage){ ~@xT]D!BQ
this.hasNextPage = hasNextPage; ]AFj&CteZ/
} -_s%8l^
Po!oN~r
/** y= 2=DU
* @return :}^Rs9 '
* Returns the hasPrePage. g+igxC}2z
*/ :eSc;
publicboolean getHasPrePage(){ uH$oGY
return hasPrePage; JK[T]|G
} ]n~yp5Nbr
j(&GVy^;?
/** a-fv[oB
* @param hasPrePage vxb@9eb!H
* The hasPrePage to set. 0%/,>IR>r
*/ c2/"KT
publicvoid setHasPrePage(boolean hasPrePage){
*K`x;r
this.hasPrePage = hasPrePage; { AFf:[G
} @]*[c})/
|0lLl^zp
/** ebzzzmwo
* @return Returns the totalPage. )W#T2Z>N1
* gglf\)E;}E
*/ z23#G>I&
publicint getTotalPage(){
x9h?e`
return totalPage; Is
ot4HLM
} / HL_$g<
>$Fp}?xX
/** ka/nQ~_#<
* @param totalPage ti}f&w
ICJ
* The totalPage to set. kY=rz&?U
*/ ,}KwP*:Z
publicvoid setTotalPage(int totalPage){ 2R\+}
this.totalPage = totalPage; fSbS(a
} @`6}`k
Cpe#[mE
} Zd$JW=KR]l
ndqckT@93
6s5yyy=L%~
nX )f'[ 7
Q<1L`_.>
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 fa4=h;>a+
G?R_aPP
个PageUtil,负责对Page对象进行构造: 0 k9<&
java代码: =PZWS&(L
f9a$$nb3`
bi.wYp(*6L
/*Created on 2005-4-14*/ !3@{U@*Z]
package org.flyware.util.page; ';Nu&D#Ph
d+0^u(gc!8
import org.apache.commons.logging.Log; ,m:L2 -J@
import org.apache.commons.logging.LogFactory; zSKKr?{
6Kp}_^|z
/** ctHEEFWm
* @author Joa &atyDFJ'
* 9n"V\e_R
*/ NJm-%K
publicclass PageUtil { Wxn#Rk#>
F\-Si!~oOz
privatestaticfinal Log logger = LogFactory.getLog {yS;NU`2
6}#"qqnx
(PageUtil.class); TM-Fu([LMV
5B?i(2
/** o,*=$/or
* Use the origin page to create a new page 7h`^N5H.q
* @param page L#2ZMy
* @param totalRecords d8o ewkiR
* @return :BD>yOlG
*/ 5z Kqb
publicstatic Page createPage(Page page, int #q;z8 @
VE$t%QT
totalRecords){ WqQU@sA
return createPage(page.getEveryPage(), X3yS5whd(
V&iS~V0.
page.getCurrentPage(), totalRecords); |vz9Hs$@l
} ({ k7#1
h8
V^sc1ak1Q
/** +GeWg`
\=
* the basic page utils not including exception 95LyYg
:j,}{)5=
handler X!c?CL
* @param everyPage x*q35K^PE
* @param currentPage `HyF_m>\
* @param totalRecords )4m_Ap\
* @return page ~},W8\C>
*/ ,Xtj;@~-
publicstatic Page createPage(int everyPage, int kceyuD$3G
c1#+Vse
currentPage, int totalRecords){ X~L!e}Rz
everyPage = getEveryPage(everyPage); U&W"Ea=R/
currentPage = getCurrentPage(currentPage); vaB!R 0
int beginIndex = getBeginIndex(everyPage, FmD +8=
1tGgDbJU
currentPage); MGaiTN^_<
int totalPage = getTotalPage(everyPage, FN\GE\H
GTAf
totalRecords); `D2Mss$!
boolean hasNextPage = hasNextPage(currentPage, !_x*m@/
-_>.f(1
totalPage); B^q<2S;
boolean hasPrePage = hasPrePage(currentPage); H~Uq?!=b
d.r Y-k
returnnew Page(hasPrePage, hasNextPage, _ECB^s_
everyPage, totalPage, {y-`QS
currentPage, %l|\of7P2}
#PFO]j!_b
beginIndex); (B}+h
} UA(;fZ@
>>7aw" 0
privatestaticint getEveryPage(int everyPage){ .NnGVxc5*
return everyPage == 0 ? 10 : everyPage; N!c
gN
} CDCC1B G"
fM^<+o@
privatestaticint getCurrentPage(int currentPage){ 38Efp$)
return currentPage == 0 ? 1 : currentPage; [:B*6FXMN~
} WQKj]:qk0
^73=7PZ
privatestaticint getBeginIndex(int everyPage, int GV6mzD@<
Ekjf^Uo
currentPage){ %wL,v.}
return(currentPage - 1) * everyPage; &t_h'JX&
} Pfan7fq+
.'lN4x
privatestaticint getTotalPage(int everyPage, int r\xXU~$9v
jdlG#j-\
totalRecords){ X4Xf2aXI
int totalPage = 0; .$wLLE^*
}4h0bI
if(totalRecords % everyPage == 0)
TQ' e
totalPage = totalRecords / everyPage; n(R_#,Hs
else 98UlNP
totalPage = totalRecords / everyPage + 1 ; )4uq
iA6
3cThu43c
return totalPage; * nCx[
} [H^ X"D
oEIqA
privatestaticboolean hasPrePage(int currentPage){ 5;Ia$lm=y
return currentPage == 1 ? false : true; X9~p4ys9{
} K7RKF$Z\
|-61(X.
privatestaticboolean hasNextPage(int currentPage, #LWg" i
.bfST.OA
int totalPage){ v#U pw\!
return currentPage == totalPage || totalPage == <V
S2]13
%wW'!p-<
0 ? false : true; S@A<6
} +c?ie4
=4> @8=JA
}
07r
} e5OVq
,
)X%oXc&C|
jL_5]pzJ
jY+Do:#/wO
@C_ =*
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。 a_%>CD${t
sam[s4@eQ
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 aAcKwCGq\
`]{Psc6_=
做法如下: ]]y[t|6
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 ^ZVOql&
<<<NXsH
的信息,和一个结果集List: 8&?p
java代码: 7LdzZS0OM
m1y `v"
`^%@b SE(
/*Created on 2005-6-13*/ 4if\5 P:j
package com.adt.bo; a7*COh
xB,/dMdTj
import java.util.List; Hz? ,#>{
6sy,A~e
import org.flyware.util.page.Page; yxY
h?ka
L!vWRwZwC
/** g]4yAV<2
* @author Joa ,!H\^Vfl
*/ D!me%;
publicclass Result { X+*<B(E
8})|^%@n
private Page page; oX{@'B
g-|Kyhr?=
private List content; NfqJ=9
!mae^A1
/** ]CIe~q
* The default constructor QH:>jmC{1h
*/ hpas'H>J
public Result(){ 4v>o%
super(); PY\W
} Q[jI=$Q)
*?p
^6vO
/** $':JI#
* The constructor using fields X&.:H~xS+
* bl`D+/V
* @param page l-cW;b~
* @param content yIWc\wv
*/ gY%OhYtF2
public Result(Page page, List content){ 3? };
this.page = page; T:6K?$y?
this.content = content; \*Ts)EW
} {x9j_/R
hAlPl<BO#V
/** %6N)G!P
* @return Returns the content. *h:D|4oJ(
*/ i`R(7Z
publicList getContent(){ 7MoR9,(
return content; L,WkJe3
} hcQSB00D^
\FVNXUMU
/** 3`xsK[
* @return Returns the page. pL8H8kn
*/ o>.AdZby
public Page getPage(){
[A|(A$jl
return page; >n1h^AW
} e~3]/BL
`|&\e_"DE
/** 'frWu6]<
4
* @param content c5<kbe
* The content to set. R9Ldl97'
*/ q)vK`\Y
public void setContent(List content){ 8~;{xYN )
this.content = content; _a fciyso
} vz- 9<w;>a
tp7oc_s?.
/** s;anP0-O
* @param page 3T"2S[gT
* The page to set. uFz/PDOZ@
*/ "v@);\-V
publicvoid setPage(Page page){ $K`_
K#A
this.page = page; yVT&rQ"{
} MgHOj
} wj}=@HS,3!
f+{c1fb>s
C\y[&egww
lQ+Ru8I
_2wAaJvA
2. 编写业务逻辑接口,并实现它(UserManager, ,NjX&A@
rH[5~U
UserManagerImpl) :8](&B68gE
java代码: W^^K0yn`@
I).=v{@9V<
| -JI`!7
/*Created on 2005-7-15*/ SL6mNn9c
package com.adt.service; wYZy e^7
976E3u"Vt
import net.sf.hibernate.HibernateException; XPar_8I
AmP#'U5
import org.flyware.util.page.Page; np<f,
jn.R.}TT
import com.adt.bo.Result; 7bctx_W&6
!y.ei1diw
/** 0eQ~#~j&
* @author Joa 3 %z
*/ ?R dmKA
publicinterface UserManager { _cW_u?0X:
qlz( W
public Result listUser(Page page)throws 1_N~1Ik
6XQ*:N/4al
HibernateException; u)<Ysx8G
%M|Z}2qv
} $KoPGgC[
}v_p gatC
5LDQ^n
?| D$#{^
ZC3tbhV
java代码: m-:8jA?
LEYWH%y
_<Hb(z
/*Created on 2005-7-15*/ 6a "VCE]
package com.adt.service.impl; ..vSL
UN
cYu9[
import java.util.List; "6NFe!/Y$*
CQ@#::'F1
import net.sf.hibernate.HibernateException; 6Cz7A
sN}s61
import org.flyware.util.page.Page; tebWj>+1c
import org.flyware.util.page.PageUtil; qZT 4+&y
b&\3ps
import com.adt.bo.Result; &