Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 _{-GR -
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 iT
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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 II),m8G
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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 "j~=YW+l
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分页支持类: K\o!
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java代码: oz@yF)/Sm
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package com.javaeye.common.util; I'J=I{p*
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import java.util.List; u\>Ed9^
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publicclass PaginationSupport { F4d L{0;j
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publicfinalstaticint PAGESIZE = 30; t t#M4n@
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privateint pageSize = PAGESIZE; hC~lH eH
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privateList items; 00<iv"8
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privateint totalCount; l6)*u[}E
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privateint[] indexes = newint[0]; d(R3![:
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privateint startIndex = 0; [|uAfp5R
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public PaginationSupport(List items, int C9({7[k^%
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totalCount){ !t[X/iu
setPageSize(PAGESIZE); 1\_4# @')
setTotalCount(totalCount); !MQo=k
setItems(items); R1A!ob
setStartIndex(0); U
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} sL[,J[AN;
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public PaginationSupport(List items, int 5jkW@
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totalCount, int startIndex){ 7?B]X%
setPageSize(PAGESIZE); BxlpI[yWq
setTotalCount(totalCount); {Pu\KRU
setItems(items); G8eAj%88
setStartIndex(startIndex); #jK{)%}mA
} a\^DthZ!;|
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public PaginationSupport(List items, int GT2;o
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totalCount, int pageSize, int startIndex){ C %y AMQ
setPageSize(pageSize); OfY>~d
setTotalCount(totalCount); N',]WZ}
setItems(items); Gz$DsaG
setStartIndex(startIndex); eH79,!=2
} T3!l{vG
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publicList getItems(){ Ow mI*`
return items; @ttcFX1:W
} 5-aCNAF2
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publicvoid setItems(List items){ aCy2.Qn
this.items = items; naM4X@jl
} +g\u=&<6
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publicint getPageSize(){ xlS
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return pageSize; ,,b_x@y*
} 980[]&(
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publicvoid setPageSize(int pageSize){ ]-["sw
this.pageSize = pageSize; ^vJ08gu_W
} 3v5]L3
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publicint getTotalCount(){ \MX>=
return totalCount; y7$e7~}/
} 3mpEF<z
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publicvoid setTotalCount(int totalCount){ NCl$vc;,
if(totalCount > 0){ 19&!#z
this.totalCount = totalCount; *>zr'Tt,W
int count = totalCount / O. @_2
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pageSize; ub./U@1
if(totalCount % pageSize > 0) cM.q^{d`
count++; K|E}Ni
indexes = newint[count]; [Gy sx
for(int i = 0; i < count; i++){ BX2&tQSp
indexes = pageSize * \Qz>us=G
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} N{
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}else{ Y |n_Ro^~
this.totalCount = 0; 1,9RfY V
} phEM1",4T
} nD!C9G#oS
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publicint[] getIndexes(){ `L7 cS
return indexes; l,-smK69
} o#Rao#bD:
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publicvoid setIndexes(int[] indexes){ F2OU[Z,-]
this.indexes = indexes; ZXe[>H
} &I <R|a
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publicint getStartIndex(){ i#iY;R8
return startIndex; )6^b\`
} Vr`UF0_3q
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publicvoid setStartIndex(int startIndex){ }DY^a'wJ-
if(totalCount <= 0) boJQ3Xc
this.startIndex = 0; qS+'#Sn
elseif(startIndex >= totalCount) SQW A{f
this.startIndex = indexes :.DCRs$Q
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[indexes.length - 1]; kVe}_[{m
elseif(startIndex < 0) l4v)tV~
this.startIndex = 0; W>/O9?D
else{ yV=hi?f-[V
this.startIndex = indexes ^~eT#Y8
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[startIndex / pageSize]; >LwAG:Ud
} -P@o>#Em
} Et# }XVCJ
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publicint getNextIndex(){ ir3iW*5k
int nextIndex = getStartIndex() + Jel%1'Dc^
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pageSize; m-7^$
if(nextIndex >= totalCount) VS1gg4tCv
return getStartIndex(); ex&&7$CXc
else MoO
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return nextIndex; *M6M'>Tin
} VCkhK9(N
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publicint getPreviousIndex(){ Eki7bT@/
int previousIndex = getStartIndex() - @_h/%>0
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pageSize; 5-5qm[.;
if(previousIndex < 0) f+-w~cN
return0; _H<ur?G
else -Y2h vC
return previousIndex; C(7LwV
} Hg*6I%D[So
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} M@
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抽象业务类 <b{Le{QJ*
java代码: }m\
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/** T[~ak"M
* Created on 2005-7-12 xAon:58m{
*/ *`=V"nXw$|
package com.javaeye.common.business; {6a";Xj\e
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import java.io.Serializable; }7wQFKME
import java.util.List; c3g\*)Jz"F
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import org.hibernate.Criteria; g>T'R Vb
import org.hibernate.HibernateException; y85GKysT
import org.hibernate.Session; N}pE{~Y
import org.hibernate.criterion.DetachedCriteria; s
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import org.hibernate.criterion.Projections; oC^-" (#
import Jg/WE1p>
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j
org.springframework.orm.hibernate3.HibernateCallback; /J wQ5
import !
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org.springframework.orm.hibernate3.support.HibernateDaoS qwiM.b5
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upport; gMFTZQsP
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import com.javaeye.common.util.PaginationSupport; V:2|l!l*
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public abstract class AbstractManager extends OAc+LdT
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HibernateDaoSupport { pc:~_6S
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privateboolean cacheQueries = false; .2Y"=|NdA
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privateString queryCacheRegion; &AoXv`l4
. m@Sk`s
publicvoid setCacheQueries(boolean }#a d
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cacheQueries){ coyy T
this.cacheQueries = cacheQueries; Wd3/Y/MD
} y*2:(nI
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publicvoid setQueryCacheRegion(String _u]Wr%D@
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queryCacheRegion){ E{(7]Wri
this.queryCacheRegion = f* p=]]y
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queryCacheRegion; `:R8~>p
} B
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publicvoid save(finalObject entity){
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getHibernateTemplate().save(entity); ko=vK%E[
} OqHD=D[
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publicvoid persist(finalObject entity){ -]A,SBs
getHibernateTemplate().save(entity); GbBcC#0
} M,3sK!`>
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publicvoid update(finalObject entity){ G#
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getHibernateTemplate().update(entity); m80Q Mosp
} k`'^e/
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publicvoid delete(finalObject entity){ '\[GquK;P
getHibernateTemplate().delete(entity); `G@]\)-!
} O{%yO=`r
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publicObject load(finalClass entity, <x53b/ft
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finalSerializable id){ r@/+
return getHibernateTemplate().load }3V Q*'X>i
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(entity, id); 3tA6r
} 8%U+y0j6b
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publicObject get(finalClass entity, l]uF!']f
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finalSerializable id){ &Plc
return getHibernateTemplate().get [y W0U:m
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(entity, id); )8!""n~
} J
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publicList findAll(finalClass entity){ HX7"w
return getHibernateTemplate().find("from 69p>?zn
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" + entity.getName()); g;UB+Y 247
} %8DU}}Rj
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publicList findByNamedQuery(finalString Xt_8=Q
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namedQuery){ #||^l_
return getHibernateTemplate 9h9 jS~h
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().findByNamedQuery(namedQuery); bd5\Rt
} pi7W8y
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publicList findByNamedQuery(finalString query, v1oq[+
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finalObject parameter){ |~Z.l
return getHibernateTemplate [sy~i{Bm
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().findByNamedQuery(query, parameter); 5N@k9x
} F;kY5+a7~e
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publicList findByNamedQuery(finalString query, ^mv F%"g
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finalObject[] parameters){ 64fa0j~<*M
return getHibernateTemplate 6c$ so
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().findByNamedQuery(query, parameters); !D!~4h)
} wqk D
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publicList find(finalString query){ V|13%aE_v
return getHibernateTemplate().find iP]KV.e'/C
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(query); ;6KcX \g-
} "v@Y[QI
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publicList find(finalString query, finalObject z"Miy
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parameter){ 1hp`.!3]H
return getHibernateTemplate().find ?#YheML?
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(query, parameter); Tvqq# ;I
} WYSqnmi
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public PaginationSupport findPageByCriteria @.0>gmY;:
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(final DetachedCriteria detachedCriteria){ eyUguA<lK\
return findPageByCriteria N?hQ53#3
* ?x$q/a
(detachedCriteria, PaginationSupport.PAGESIZE, 0); /99S<U2ej
} YcOPqvQ
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public PaginationSupport findPageByCriteria =PYfk6j9
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(final DetachedCriteria detachedCriteria, finalint RtO3!dGT.
[
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startIndex){ |;sL*Vr
return findPageByCriteria f>!)y- 7
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(detachedCriteria, PaginationSupport.PAGESIZE,
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startIndex); uatY:GSR
} )eIC5>#.
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public PaginationSupport findPageByCriteria 55q!2>Jh.
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(final DetachedCriteria detachedCriteria, finalint v3O+ ;4
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pageSize, #{K}o}
finalint startIndex){ 0)F.Y,L
return(PaginationSupport) Z.'j7(tu
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getHibernateTemplate().execute(new HibernateCallback(){ \kWL:uU
publicObject doInHibernate iMjoatt
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(Session session)throws HibernateException { G5*"P!@6
Criteria criteria = |ecK~+
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detachedCriteria.getExecutableCriteria(session); ,Ei!\U^)
int totalCount = +q n[F70}
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((Integer) criteria.setProjection(Projections.rowCount }?G([s56
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()).uniqueResult()).intValue(); >x?x3 #SX
criteria.setProjection 2iM]t&^<+
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(null); vT@*o=I
List items = ;>hRj!
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criteria.setFirstResult(startIndex).setMaxResults B|d-3\sn
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(pageSize).list(); {=K);z
PaginationSupport ps = zVt1Ta:j
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new PaginationSupport(items, totalCount, pageSize, `A\,$(q+
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startIndex);
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return ps; $40G$w
} 'h}(> %
}, true); w'[JfMu P
} d*$L$1S
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public List findAllByCriteria(final T<?
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DetachedCriteria detachedCriteria){ {%wF*?gk
return(List) getHibernateTemplate =hRo#]{(K
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().execute(new HibernateCallback(){ [}$jO,H5r
publicObject doInHibernate tJBj9{
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(Session session)throws HibernateException { )[b\wrc
Criteria criteria = :2t0//@X
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detachedCriteria.getExecutableCriteria(session); <+y%k~("
return criteria.list(); "m#17J_
} m^!Kthq
}, true); 0<i8
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} i?wEd!=w
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public int getCountByCriteria(final '\B0#z3
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DetachedCriteria detachedCriteria){ rEHlo[7^
Integer count = (Integer) o|G'vMph
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getHibernateTemplate().execute(new HibernateCallback(){ Qm_IU!b
publicObject doInHibernate `T\_Wje(
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(Session session)throws HibernateException { f9K+o-P.h
Criteria criteria = 7D(Eo{ue
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detachedCriteria.getExecutableCriteria(session); m!5MGq~
return gV}c4>v(
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criteria.setProjection(Projections.rowCount o75l&`
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()).uniqueResult(); HPMj+xH
} *iX PG9XZ
}, true); 4A0v>G`E*#
return count.intValue(); >sjvE4s
} j>8S,b=%
} n'To:
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用户在web层构造查询条件detachedCriteria,和可选的 |A.nP9 hW
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 S
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PaginationSupport的实例ps。 \G0YLV~>P
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ps.getItems()得到已分页好的结果集 {uDH-b(R
ps.getIndexes()得到分页索引的数组 qTrM*/m:]L
ps.getTotalCount()得到总结果数 8-_atL
ps.getStartIndex()当前分页索引 hG~HV{6
ps.getNextIndex()下一页索引 >*MGF=.QG
ps.getPreviousIndex()上一页索引 HV&i! M@T
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 g@'2 :'\
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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 tmd{Gx}c
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一下代码重构了。 q`VkA
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我把原本我的做法也提供出来供大家讨论吧: 5g%D0_e5
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首先,为了实现分页查询,我封装了一个Page类: ( Sjlm^bca
java代码: @Q7^caG
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/*Created on 2005-4-14*/ u9{SG^
package org.flyware.util.page;
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/** 4/V;g%0uN;
* @author Joa TNDp{!<|L;
* J%]5C}v \
*/ 1#3eY?Nb
publicclass Page { K]1|#`n
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/** imply if the page has previous page */ Z;z,dw
privateboolean hasPrePage; m
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/** imply if the page has next page */ HZ2f|Y|T
privateboolean hasNextPage; :%gM
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/** the number of every page */ K5RgWP
privateint everyPage; ]s0GAp"
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/** the total page number */ O2":)zU.
privateint totalPage; z6Fl$FFP
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/** the number of current page */ %ikPz~(
privateint currentPage; ~|[i64V<^
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/** the begin index of the records by the current 3&I3ViAH
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query */ 2Lytk OMf
privateint beginIndex; <isU D6TC
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/** The default constructor */ Jz4;7/
public Page(){ odDVdVx0
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} ex#-,;T
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/** construct the page by everyPage Ci 'V
* @param everyPage 7xM4=\~OG
* */ :]4s;q:m
public Page(int everyPage){ IAWs}xIly
this.everyPage = everyPage; k&M~yb
} XI:+EeM?
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/** The whole constructor */ 2I3H?Lrx!m
public Page(boolean hasPrePage, boolean hasNextPage, f*:N*cC
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int everyPage, int totalPage, mG1!~}[
int currentPage, int beginIndex){ GPizR|}h
this.hasPrePage = hasPrePage; ~$ Po3]{s
this.hasNextPage = hasNextPage; -aLM*nIoe
this.everyPage = everyPage; fu{v(^
this.totalPage = totalPage; vM-kk:n7f
this.currentPage = currentPage; y<*\D_J
this.beginIndex = beginIndex; A8QUfg@uK~
} I]HLWF
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/** P8#_E{f
* @return \[|X^8j
* Returns the beginIndex. %__ @G_M
*/ x?]fHin_
publicint getBeginIndex(){ ul
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return beginIndex; mML B?I
} @=}NMoNH
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/** q Y!LzKM0
* @param beginIndex W4qnXD1n
* The beginIndex to set. ^$mCF%e8H
*/ 4`'Rm/)
publicvoid setBeginIndex(int beginIndex){ _+)n}Se
this.beginIndex = beginIndex; mKE'l'9A_
} oKr= ]p
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/** @My
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* @return &xvNR=K[`
* Returns the currentPage. E:O/=cT
*/ e\O625
publicint getCurrentPage(){ ADM!4L(s4}
return currentPage; P8H2v_)X&
} SmRFxqtN
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/** J7`;l6+Gb
* @param currentPage gK"(;Jih$
* The currentPage to set. G^z>2P
*/ ,Y#f0
publicvoid setCurrentPage(int currentPage){ UV</Nx)3
this.currentPage = currentPage; \rT>&o .i
} )iVuac]E++
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/** kyZZ0
* @return |MN2v[y
* Returns the everyPage. ;\f0II3
*/ bdvpH DA
publicint getEveryPage(){ [w-#
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return everyPage; ?!$Dr0r
} D><^ 7nr%
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/** E(z|LS*3
* @param everyPage -<AGCiLz
* The everyPage to set. dj4a)p|YN
*/ @HE?G
publicvoid setEveryPage(int everyPage){ BlM(Q/z
this.everyPage = everyPage; U]B-B+-
} ar S@l<79
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/** xX0wn?,~
* @return {iCX?Sb
* Returns the hasNextPage. sk_xQo#Y
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*/ gxJ12'
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publicboolean getHasNextPage(){ h`eHoKJ#w
return hasNextPage;
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} '*Tt$0#o
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/** &OkPO|
* @param hasNextPage K@oyvJ$
* The hasNextPage to set. !aJ6Uf%R
*/ hZ/p'
publicvoid setHasNextPage(boolean hasNextPage){ 7AqbfLO
this.hasNextPage = hasNextPage; jK%Lewq
} J l{My^I5
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/** >5TXLOYZ
* @return )4hA Fy6l
* Returns the hasPrePage. .81 ~ K[
*/ :22wq{
publicboolean getHasPrePage(){ %h;1}SFl0
return hasPrePage; TTWiwPo59
} |+JC'b?,
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/** }AiF 7N0
* @param hasPrePage 'geN
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* The hasPrePage to set. /%F,
*/ c+O:n:L
publicvoid setHasPrePage(boolean hasPrePage){ I]pz3!On4,
this.hasPrePage = hasPrePage; |Ho}
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} &' y}L'
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/** 7osHKO<?2
* @return Returns the totalPage. K( ?p]wh
* kbbHa_;aqV
*/ rt?*eC1b+Z
publicint getTotalPage(){ ?k@;,l :s
return totalPage; MX+gc$Y
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} ?(}~[
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/** Z Y5Pf
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* @param totalPage !t{
* The totalPage to set. JW=q'ibR
*/ pX$X8z%
publicvoid setTotalPage(int totalPage){ "`4M4`'
this.totalPage = totalPage; ,% .)mf
} v`Ja Bn
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} t1$pl6&,
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 {d)L0KXK
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个PageUtil,负责对Page对象进行构造: m%.[|sZ3EM
java代码: g:6`1C
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/*Created on 2005-4-14*/ }D3hP|.X
package org.flyware.util.page; q$`>[&I~)
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import org.apache.commons.logging.Log; Sw? EF8}[
import org.apache.commons.logging.LogFactory; wS
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/** nyOmNvZf
* @author Joa Gq%,'amf
* FJ{&R Ld
*/ hx4c`fOs
publicclass PageUtil { X+N8r^&
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privatestaticfinal Log logger = LogFactory.getLog @~&^1%37)
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(PageUtil.class); qagR?)N)u
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/** WZP1g kX&M
* Use the origin page to create a new page b?,=|H
* @param page QNx xW2+
* @param totalRecords K(P.i^k
* @return w02C1oGfx
*/ ^oClf(
publicstatic Page createPage(Page page, int _~}2@&*G"
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totalRecords){ a6;5mx
return createPage(page.getEveryPage(), /xBO;'rR
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page.getCurrentPage(), totalRecords); cJM.Q_I}Y
} ,e
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/** l|;]"&|_]c
* the basic page utils not including exception %J9+`uSl
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handler aB`jFp-
* @param everyPage T#[#w*w/
* @param currentPage R D?52\
* @param totalRecords PY&mLux%
* @return page m3&