Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 g=b'T-
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 (xMAo;s_
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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 od!TwGX
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ! @|"84
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。 (Ys0|I3
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分页支持类: *c. *e4uzF
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java代码: `g3H;E
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package com.javaeye.common.util; I~EJctOG
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import java.util.List; @N34 Q-l
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publicclass PaginationSupport { Ymx/N+Jl
*&!&Y*Jzg
publicfinalstaticint PAGESIZE = 30; T2GJoJ!
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privateint pageSize = PAGESIZE; GkVV%0;&J1
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privateList items; t '* L,
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privateint totalCount; j&u{a[Y/}
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privateint[] indexes = newint[0]; *IfLoKS'
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privateint startIndex = 0; Z+JPxe#7
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public PaginationSupport(List items, int \vsfY
*}Vg]3$4
totalCount){ ?$%#y u#.
setPageSize(PAGESIZE); wm_xH_{F
setTotalCount(totalCount); Dhv ^}m@
setItems(items); 5V8WSnO
setStartIndex(0); >E6w,Ab
} vT)FLhH6*
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public PaginationSupport(List items, int #,lJ>mTe4
[s"xOP9R
totalCount, int startIndex){ VI/77
setPageSize(PAGESIZE); $zKf>[K
setTotalCount(totalCount); RX \%R
setItems(items); 6;Wns'
setStartIndex(startIndex); b dP @^Q
} a/^ojn
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public PaginationSupport(List items, int Bz!SZpW(M
8\P!47'q
totalCount, int pageSize, int startIndex){ 90X<Qs
setPageSize(pageSize); J4"?D9T3G
setTotalCount(totalCount); &C6Z-bS"
setItems(items); R0HzNk
setStartIndex(startIndex); )T&ZiHIJ3
} 2Jm#3zFYz3
E.45s? r
publicList getItems(){ `r+zNJ@q
return items; 4zzJ5,S 1
} gLy1*k4
Z^wogIAV
publicvoid setItems(List items){ Lk#8G>U
this.items = items; "V'<dn
} B
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X
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publicint getPageSize(){ k nTCX
return pageSize; %OE
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} {_C2c{
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publicvoid setPageSize(int pageSize){ c'O"</
this.pageSize = pageSize; (.^KuXd
} \I"n~h^_
<5BNcl\ZL
publicint getTotalCount(){ >>%m,F[
return totalCount; 'A2^K5`3
} m?GBvL$
M-7^\wXTA
publicvoid setTotalCount(int totalCount){ ld
if(totalCount > 0){ =e*S h0dK
this.totalCount = totalCount; hX4V}kj
int count = totalCount / E7mB=bt>=
ON [F
pageSize; #l 7(WG
if(totalCount % pageSize > 0) !A":L0[7n
count++; &Zy%Zz
indexes = newint[count]; rJtpTV@.
for(int i = 0; i < count; i++){ s`#g<_ {X
indexes = pageSize * jEu-CU#:
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i; <!;NJLe`
} r?7tI0
}else{ {?X:?M_
this.totalCount = 0; y8%QS*
} tK7v&[cI
} *{<460`!q
w Dp5HZ>
publicint[] getIndexes(){ 0H!J
return indexes; -RI&uFqOI
} :yxP3e%rp
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publicvoid setIndexes(int[] indexes){ xlIVLv6dO
this.indexes = indexes; dj-/%MU
} T\v~"pMu*0
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publicint getStartIndex(){ tXfXuHa
return startIndex; !(A<
} kltorlH
JO-FnoQK
publicvoid setStartIndex(int startIndex){ @PzRHnT*
if(totalCount <= 0) %1\~OnT
this.startIndex = 0; #kQ1,P6,(
elseif(startIndex >= totalCount) >lkjoEVQ
this.startIndex = indexes /JjSx/
'+&!;Jj,
[indexes.length - 1]; xcE2hK/+
elseif(startIndex < 0) M.qE$
this.startIndex = 0; TdeHs{|
else{ #b,!N
this.startIndex = indexes 'IQ;;[Q
!,<rW<&;
[startIndex / pageSize]; f D<0V
} A= 96N@m6
} W
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publicint getNextIndex(){ AB+HyZ*//
int nextIndex = getStartIndex() + \ lW*.<
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pageSize; U+G8Hs/y
if(nextIndex >= totalCount) ovk^
return getStartIndex(); M#}k@
;L3
else T&ib]LmR
return nextIndex; [hJASX9
} Yij_'0vZ
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publicint getPreviousIndex(){ 6GMwB@ b
int previousIndex = getStartIndex() - v8U&{pD,
^XT;n
pageSize; woUt*G@
if(previousIndex < 0) |U`ASo
return0; ST1;i5
else >@tJ7mM
return previousIndex; &SMM<^P.
} $Zn>W@\
\*mKctpz]6
} jO.c>C[?
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抽象业务类 eIcIl2
java代码: ZdJQ9y
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/** 04c`7[
* Created on 2005-7-12 1`2lq~=GV
*/ a;f A0_
package com.javaeye.common.business; N)EJP~0
ts &sr
import java.io.Serializable; \iH\N/
import java.util.List; ^Sc48iDc
9gFfbvd
import org.hibernate.Criteria; 5Z_aN|Xn
import org.hibernate.HibernateException; R:y u
import org.hibernate.Session; Q"k #eEA
import org.hibernate.criterion.DetachedCriteria; .-:@+=(
import org.hibernate.criterion.Projections; _#yd0E
import vMYEP_lhK,
6$G@>QCBS
org.springframework.orm.hibernate3.HibernateCallback; u vyvy
import F\ %PB p
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org.springframework.orm.hibernate3.support.HibernateDaoS \ccCrDz
r12e26_Ab
upport; 2{01i)2 y
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import com.javaeye.common.util.PaginationSupport; ^.>XDUO F
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public abstract class AbstractManager extends TUi<
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HibernateDaoSupport { s;,ulME
PG*FIRDb
privateboolean cacheQueries = false; 9u1Fk'cxG,
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privateString queryCacheRegion; `aM8L
a;v;% rs
publicvoid setCacheQueries(boolean gcF V$
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cacheQueries){ *40Z}1ng
this.cacheQueries = cacheQueries; 15cgmZsS
} pW5PF)([
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publicvoid setQueryCacheRegion(String R 5Cy%
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queryCacheRegion){ }/VSIS@Z
this.queryCacheRegion = m8 Ti{w(
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queryCacheRegion; *h~(LH"tN
} VMW<?V
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publicvoid save(finalObject entity){ g?9%_&/})A
getHibernateTemplate().save(entity); JT*Pm"}
} ~!ICBF~j
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publicvoid persist(finalObject entity){ Y#fiJ
getHibernateTemplate().save(entity); wi S8S{K5
} [KsVI.gn
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publicvoid update(finalObject entity){ nEh^{6
getHibernateTemplate().update(entity); baib_-$
} pjNH0mZ
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publicvoid delete(finalObject entity){ y0
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getHibernateTemplate().delete(entity); (^= Hq'D
} (Ek=0;Cr
@v=A)L
publicObject load(finalClass entity, 33w(Pw
eo'C)j# U
finalSerializable id){ b*o,re)Dj
return getHibernateTemplate().load jAOD&@z1
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(entity, id); l(?Yx
} * TR~>|
} bEu+bZ
publicObject get(finalClass entity, kA(q-Re$B*
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finalSerializable id){ mNAp FwZ
return getHibernateTemplate().get >Av%[G5=h#
J9`[Qy\
(entity, id); Q)ZkUmW
} c$]NXKcA
Zbjj>*2%^
publicList findAll(finalClass entity){ f n'N^
return getHibernateTemplate().find("from }{@RO./)[
O:(%m
" + entity.getName()); QLAyX*%B
} TkV$h(#!f&
*!x/ia9
publicList findByNamedQuery(finalString +hd1|qa4
2`w\<h
namedQuery){ aoS]Qp
return getHibernateTemplate be5NasC
# fl%~Y
().findByNamedQuery(namedQuery); pd
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} &<%U7?{~
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publicList findByNamedQuery(finalString query, Mq$Nra
Id'@!U:NA
finalObject parameter){ ti9cfv>
return getHibernateTemplate !YEU<9
G/C5o=cY
().findByNamedQuery(query, parameter); g@7j<UY
} =Pgu?WU@
@DYkWivLu
publicList findByNamedQuery(finalString query, #L,5;R{`
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finalObject[] parameters){ n)rF!a
return getHibernateTemplate 9=Rj9%
h\^> s$
().findByNamedQuery(query, parameters); JPT VZ
} AAt<{
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publicList find(finalString query){ Rd.[8#7VE
return getHibernateTemplate().find G0eJ<*|_ 3
g_w4}!|
(query); s%~p?_P
} MF^I] 7_
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publicList find(finalString query, finalObject ^NTOZ0x~#
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parameter){ >}ozEX6c2
return getHibernateTemplate().find {bvm83{T
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(query, parameter); id.W"5+
} J8yi#A>+
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public PaginationSupport findPageByCriteria DqHVc)9
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(final DetachedCriteria detachedCriteria){ =7`0hS<@F
return findPageByCriteria 7a:mZ[Vh
;{~F7:i
(detachedCriteria, PaginationSupport.PAGESIZE, 0); md/Z[du:'
} uz+b
p
}bTI5
public PaginationSupport findPageByCriteria fE/8;v!=
-j_J1P0,
(final DetachedCriteria detachedCriteria, finalint 8}W06k>)%
:{tvAdMl7
startIndex){ #YSUPO%F
return findPageByCriteria s:/.:e_PU
, eZL&n
(detachedCriteria, PaginationSupport.PAGESIZE, @kKmkVhu*
; (+r)r_
startIndex); b\w88=|
} $V)LGu2(m
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public PaginationSupport findPageByCriteria 7o+!Gts]
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(final DetachedCriteria detachedCriteria, finalint QPfS3%p`
|8"~ou:.
pageSize, -$4%@Z
finalint startIndex){ WLWE%bDP
return(PaginationSupport) 3EcmNwr
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getHibernateTemplate().execute(new HibernateCallback(){ BKm$H!u
publicObject doInHibernate O/\jkF
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(Session session)throws HibernateException { 2eu`X2IBcT
Criteria criteria = [hS?d.D
QWf)5S
detachedCriteria.getExecutableCriteria(session); Rh%/xG#k
int totalCount = 3Fn26Rij
7
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((Integer) criteria.setProjection(Projections.rowCount szwXr
K`FgU7g{
()).uniqueResult()).intValue(); ^[CD- #
criteria.setProjection !DCJ2h%E[_
m=S[Y^tR
(null); u
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List items = O`dob&C
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criteria.setFirstResult(startIndex).setMaxResults zux+ooU
8y!fqXm%)
(pageSize).list(); GD'C^\EaZ
PaginationSupport ps = .VmI4V?}h
ZjEO$ts=@
new PaginationSupport(items, totalCount, pageSize, 5
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B<[;rk
startIndex); E!VAA=
return ps; [JVI@1T
} ,/W<E
}, true); KF'H|)!K
} fu=}E5ScK
tTyu,%/m
public List findAllByCriteria(final .KT+,Y
c)SSi@<
cv
DetachedCriteria detachedCriteria){ :*&wnQMKR
return(List) getHibernateTemplate im+2)9f
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().execute(new HibernateCallback(){ S53%*7K.
publicObject doInHibernate ["Q8`vV0WO
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(Session session)throws HibernateException { '{cN~A2b4
Criteria criteria = dtM@iDljj
#G.3a]p}"
detachedCriteria.getExecutableCriteria(session); 2a=WT`xf?
return criteria.list(); 7Nwi\#o
} 0v0Y(
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}, true); vEzzdDwi6
} jD^L <
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public int getCountByCriteria(final XU9=@y+|v
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DetachedCriteria detachedCriteria){ Ip4NkUI3T
Integer count = (Integer) sp**Sg)
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getHibernateTemplate().execute(new HibernateCallback(){ ITc/aX
publicObject doInHibernate aG}9Z8D
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(Session session)throws HibernateException { ;6b#I$-J-
Criteria criteria = @gi
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detachedCriteria.getExecutableCriteria(session); &ApJ'uC
return #]eXI
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criteria.setProjection(Projections.rowCount }7=a,1T
D hZtiqL#_
()).uniqueResult(); j|`{
1`'
} 4nl>&AV
}, true); z}bnw2d]
return count.intValue(); {sm={q
} dBlOU.B
} Msd!4TrBJ
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用户在web层构造查询条件detachedCriteria,和可选的 doR'=@ W
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 h{* O9O<
p fBO5Ys
PaginationSupport的实例ps。 _kY5
6
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ps.getItems()得到已分页好的结果集 mzT} C&hfP
ps.getIndexes()得到分页索引的数组 )b%c]!
ps.getTotalCount()得到总结果数 "{x~j\<
ps.getStartIndex()当前分页索引 Ox~'w0c,f
ps.getNextIndex()下一页索引 Tc88U8Gc
ps.getPreviousIndex()上一页索引 _).'SU)>
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 #`p>VXBj!
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,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 r0X2cc
o`77gkLO
一下代码重构了。 *}_/:\v
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我把原本我的做法也提供出来供大家讨论吧: *c AoE l
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首先,为了实现分页查询,我封装了一个Page类: DYWC]*
java代码: 4iLU "~
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/*Created on 2005-4-14*/ dJLJh*=AG
package org.flyware.util.page; sd[QtK^
R82Y&s;
/** y:A0!75
* @author Joa fiZv+R<x1
* okcl-q
*/ =wj~6:Bf
publicclass Page { Y=rr6/k
Oq2H>eW`f
/** imply if the page has previous page */ Iv<9})2K
privateboolean hasPrePage; xF/D YXC{8
.HQ<6k:
/** imply if the page has next page */ og\XLJ}_
privateboolean hasNextPage; y[|g!9Rp
=+"'=o
/** the number of every page */ ;yZ N
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privateint everyPage; +E [b Lz^
*(`.h\+
/** the total page number */ %f-<ol
privateint totalPage; $dnHUBB
{6n \532@
/** the number of current page */ A$F;fCV*
privateint currentPage; ^97ZH)Ww
_#4,&bh8
/** the begin index of the records by the current ,\M_q">npc
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query */ # 0!IUSa
privateint beginIndex; "B}08C,?
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d>`(.qvxR
/** The default constructor */ if}]8
public Page(){ rl^LSz
-7O/ed+
} ^<VE5OM
z`5I1#PVA
/** construct the page by everyPage Ozv.;}SE
* @param everyPage vs@:L)GW\
* */ ^d9raYE`'
public Page(int everyPage){ gk z#kiGF
this.everyPage = everyPage; LgNNtZ&F
} 4:@|q:DR
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/** The whole constructor */ 0w['jh|,
public Page(boolean hasPrePage, boolean hasNextPage, z=p
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oPy zk7{
int everyPage, int totalPage, kV rT?
int currentPage, int beginIndex){ Mdrv/x{
this.hasPrePage = hasPrePage; M=WE^v!b
this.hasNextPage = hasNextPage; #P-HV
this.everyPage = everyPage; X{xJ*T y'
this.totalPage = totalPage; ~|9LWp_
this.currentPage = currentPage; B%@!\D#
this.beginIndex = beginIndex; ]2%P``Yj
} nh=Us^xD
arLl8G[
/** (<C%5xk
* @return 6h_ k`z
* Returns the beginIndex. |<|,RI?
*/ V3W85_*
publicint getBeginIndex(){ NydW9r:T
return beginIndex; (YJAT
} #=H}6!18
JX)z<Dz$
/** Cj1UD;
* @param beginIndex B^(rUR
* The beginIndex to set. $l;tP
*/ DiQkT R
publicvoid setBeginIndex(int beginIndex){ GQ0 (&I
this.beginIndex = beginIndex; W79A4l<
} c'+r[rSn1
;]M67ma7C
/** 'D"K`Vw
* @return R[9PFMn
* Returns the currentPage. (MoTG^MrBY
*/ m90R8 V
publicint getCurrentPage(){ (I[h.\%
return currentPage; '(pdk
} *z"1MU
e6i./bf3
/** y}-S~Ov>I
* @param currentPage .(1j!B4^
* The currentPage to set. 0^&R7Rv c
*/ xnQGCw?S&}
publicvoid setCurrentPage(int currentPage){ O4PdN?
this.currentPage = currentPage; {qWG^Db
} ?SO F
n
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/** P>T*:!s ;
* @return 06@0r
* Returns the everyPage. To8v#.i
*/ }Q=se[((
publicint getEveryPage(){ lMzCDx!m
return everyPage; N"x\YHp
} ms\/=96F
ar
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/** y[WYH5&DJ
* @param everyPage !bV(VRbu
* The everyPage to set. #8f"}>U9.,
*/ .-u k
publicvoid setEveryPage(int everyPage){ cevV<Wy+
this.everyPage = everyPage; :IT U0%;!+
} d)GkXll1D
@oqi@&L'C
/** VtzmY
* @return !+45=d 5
* Returns the hasNextPage. YNJpQAuSn)
*/ YTjuSV
publicboolean getHasNextPage(){ Ddl% V7
return hasNextPage; 7YXXkdgbd
} 'oiD#\t4
,6orB}w?z
/** Sp~Gv>uMK
* @param hasNextPage FX|lhwmc(
* The hasNextPage to set. KpbZnW}g
*/ FSwgPIO>
publicvoid setHasNextPage(boolean hasNextPage){ h>^jq{yu
this.hasNextPage = hasNextPage; :
9?Cm`
} c7l!G~yx'
So\| Ye
/** X|damI%
* @return Q"6hD?6.
* Returns the hasPrePage. e7bT%h9i
*/ qgC-@I
publicboolean getHasPrePage(){ v_ nBh,2
return hasPrePage; K!D_PxV
} `/wq3+ ?
G\:psx/
/** M*~v'L_sI
* @param hasPrePage H8<7#
* The hasPrePage to set. :&1=8^B Y
*/ nA_
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publicvoid setHasPrePage(boolean hasPrePage){ A D}}>v
this.hasPrePage = hasPrePage; kk/+Vx~
} %j[LRY/
YKw!pu=
/** ZLN_,/7
* @return Returns the totalPage. %is,t<G
* ny
*/ o9T@uWh+
publicint getTotalPage(){ L=$?q/=-
return totalPage; "\zj][sL
} orQV'
17n+4J]
/** V^Mf4!A(y
* @param totalPage wKi}@|0[@
* The totalPage to set. }KD7 Y
*/ }[KDE{,V
publicvoid setTotalPage(int totalPage){ 6&
&} P79
this.totalPage = totalPage; Pi"~/MGP$
} iFwyh`Bcg
ph8Jn+|E
} |>IUtUg\
0?6If+AC
ER;lkF`RF
/H%<oAjp6
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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 ~`~%(DA=
z)ft3(!
个PageUtil,负责对Page对象进行构造: (DG@<K,6
java代码: ebO`A2V'(
rF8W(E_=
xqQ~|
/*Created on 2005-4-14*/ %0+h
package org.flyware.util.page; <=)D=Ax/_[
3XAp Y'
import org.apache.commons.logging.Log; \tiUEE|k
import org.apache.commons.logging.LogFactory; `'[7~ Ew[
WbC0H78]
/** 9zoT6QP4
* @author Joa -TK|Y"
* P|e:+G 7
*/ rR,+G%[(=4
publicclass PageUtil { F=-uDtQ<N
.Ca"$2
privatestaticfinal Log logger = LogFactory.getLog "}'8`k+d
g+ >=C
(PageUtil.class); ;gxN@%}@
H}) Dcg3
/** i14[3bPLk!
* Use the origin page to create a new page VjA wn}eO
* @param page 7d|*postv
* @param totalRecords x9x#'H3
* @return /-!&k
*/ SE,o7_k'S
publicstatic Page createPage(Page page, int .0nn0)"
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totalRecords){ iA55yT+
return createPage(page.getEveryPage(), )(:+q(m
4|zdXS
page.getCurrentPage(), totalRecords); b(PHZCy#
} 9SRfjS{7
u(V
/** 0On?{Bw
* the basic page utils not including exception a"0B?3*r46
4
[R8(U[g
handler ~")hE%Kl}
* @param everyPage (R4PD
* @param currentPage z+3<$Z
* @param totalRecords LJRg>8
* @return page ZNzR`6}
*/
_'!aj+{
publicstatic Page createPage(int everyPage, int 1s{ISWm
u @{E{
currentPage, int totalRecords){ pY+.SuM
everyPage = getEveryPage(everyPage); 7ei>L]gm%
currentPage = getCurrentPage(currentPage); Q!4i_)rM
int beginIndex = getBeginIndex(everyPage, ${A5-
(v|r'B9b
currentPage); "rme~w Di
int totalPage = getTotalPage(everyPage, g".d"d{
Ys"|</;dbj
totalRecords); , vY)n6
boolean hasNextPage = hasNextPage(currentPage, uL2"StW
1*C:hg@
totalPage); Zu\p;!e
boolean hasPrePage = hasPrePage(currentPage); Q0pC4WJ`
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returnnew Page(hasPrePage, hasNextPage, cZNi~
everyPage, totalPage, pwJ'3NbS
currentPage, Ad dGB^7yl
:y=!{J<
beginIndex); k_,MoDz
} L8K0^~Mk
Um]p&phVL
privatestaticint getEveryPage(int everyPage){ Sg-g^dIN1
return everyPage == 0 ? 10 : everyPage; ,\BVV,
} IZv~[vi_
8|1`Tn}o
privatestaticint getCurrentPage(int currentPage){ -Qg
2qN2{
return currentPage == 0 ? 1 : currentPage; |0tg:\.
} ./5jx2V
:z
B}z^8-
privatestaticint getBeginIndex(int everyPage, int Sa%zre@
kP)YgkE
currentPage){ FhWmO
return(currentPage - 1) * everyPage; T#\p%w9d
} M,crz
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privatestaticint getTotalPage(int everyPage, int %4j&H!y-w;
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totalRecords){ |J:$MX~
int totalPage = 0; RS'} nY}
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if(totalRecords % everyPage == 0) -u6}T!
totalPage = totalRecords / everyPage; o:_^gJ+|
else sT)6nV
totalPage = totalRecords / everyPage + 1 ; ,VAp>x+O
.
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return totalPage; Q(lku"U'
} BR;QY1
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privatestaticboolean hasPrePage(int currentPage){ pJd 0k"{
return currentPage == 1 ? false : true;
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} ;SfNKu
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privatestaticboolean hasNextPage(int currentPage, 6^Ph '
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int totalPage){ Q4X7Iu:
return currentPage == totalPage || totalPage == Xad*Iulj
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0 ? false : true; ,:^
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} x Y| yI>
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} JL.5QzA
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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。 2
#KoN8%
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