Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 aql8Or1[
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 RVLVY:h|F
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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 N;6o=^ic
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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 $CX3P)%
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分页支持类: ~id:Rh>o
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java代码: 2CneRKQy
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package com.javaeye.common.util; Zj'%c2U_
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import java.util.List; h:r?:C>n
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publicclass PaginationSupport { %Ta"H3ZW
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publicfinalstaticint PAGESIZE = 30; Gn_DIFa
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privateint pageSize = PAGESIZE; P)J-'2{
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privateList items; fwV2b<[
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privateint totalCount; ahy6a,)K~
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privateint[] indexes = newint[0]; hh&$xlO)(v
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privateint startIndex = 0; 2zW IB[
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public PaginationSupport(List items, int g$?^bu dxv
]+W){W=ai
totalCount){ +>K&zS
setPageSize(PAGESIZE); 4gsQ:3
setTotalCount(totalCount); yNP4Ey
setItems(items); ?4Rd4sIM$u
setStartIndex(0); `Hlf.>b1
} J:Qx5;b;
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public PaginationSupport(List items, int :TG;W,`.V
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totalCount, int startIndex){ QOSMV#Nw%
setPageSize(PAGESIZE); X )tH23
setTotalCount(totalCount); A@)Q-V8*9s
setItems(items); iC=>wrqY>
setStartIndex(startIndex); MyllL@kP
} ]h(Iun
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public PaginationSupport(List items, int %\HPYnIe
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totalCount, int pageSize, int startIndex){ <TtPwUX
setPageSize(pageSize); abR<( H12
setTotalCount(totalCount); zdRVAcrwQ
setItems(items); tJrGRlB>
setStartIndex(startIndex); 4=Ru{ewRV
} : #CWiq("%
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publicList getItems(){ XxS#~J?:_
return items; d\]KG(T
} @ztT1?!e
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publicvoid setItems(List items){ eTvjo(Lvx
this.items = items; ZZI}
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} +u0of^}=
@Xl(A]w%!
publicint getPageSize(){ s.i9&1Y-!
return pageSize; WF~BCP$OR
} nLz;L r!
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publicvoid setPageSize(int pageSize){ 8^y=YUT
this.pageSize = pageSize; K {v^Y,B
} _Fa\y ZX
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publicint getTotalCount(){ iIX%%r+
return totalCount; A'z]?xQR
} Ia}qDGqPp!
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publicvoid setTotalCount(int totalCount){ &'W7-Z\j-
if(totalCount > 0){ BNCM{}e
this.totalCount = totalCount; '`k7l7I[@
int count = totalCount / |f fHOef
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pageSize; = +MF@ 4
if(totalCount % pageSize > 0) -^CW}IM{ I
count++; M1-tRF
indexes = newint[count]; sPvs}}Z]P
for(int i = 0; i < count; i++){ mB_?N $K
indexes = pageSize * B+Qf?1f
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i; :5%98V>02
} bTimJp[b
}else{ s_NY#MPz[
this.totalCount = 0; X1.-C@o
} '2lzMc>wvP
} 0<!9D):Bb
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publicint[] getIndexes(){ M11\Di1
return indexes; xn2 nh@;
} 5tbCx!tL
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publicvoid setIndexes(int[] indexes){ `KA==;0
this.indexes = indexes; *mp:#'
} $5 mGYF]
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publicint getStartIndex(){ yO)xN=o^\
return startIndex; \{ EVRRXn
} :k1?I'q%
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publicvoid setStartIndex(int startIndex){ g@>llve{
if(totalCount <= 0) 3oLF^^^g
this.startIndex = 0; V0,JTWc
elseif(startIndex >= totalCount) Pq [_(Nt
this.startIndex = indexes 2.%)OC!q&5
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[indexes.length - 1]; "D.<~!
elseif(startIndex < 0) SzMh
this.startIndex = 0; ]Wkgpfd56
else{ RQ8d1US
this.startIndex = indexes Nq`;\E.M
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[startIndex / pageSize]; 62R";# K
} ,:(s=JN+
} C;m"W5+
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publicint getNextIndex(){ wkZwtq
int nextIndex = getStartIndex() + ,gQl_Amvz
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pageSize; <7U~0@<Y
if(nextIndex >= totalCount) BN79\rt
return getStartIndex(); ?m *e$!M0
else NuR7pjNMZ
return nextIndex; :38{YCN
} `qs,V
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publicint getPreviousIndex(){ -8qCCV&1i
int previousIndex = getStartIndex() - K-k!':K:
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pageSize; ulsU~WW7r
if(previousIndex < 0) 8<Iq)A]'Z
return0; #8et91qw
else `r1}:`.m,
return previousIndex; 3!p`5hJd
} %J-0%-/_S:
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} sF!#*Y
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抽象业务类 c@[Trk m
java代码: ?.`
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/** F&wAre<
* Created on 2005-7-12 9k;,WU(K<
*/ aU(.LC
package com.javaeye.common.business; o C|oh
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import java.io.Serializable; y-+W
import java.util.List; !lfE7|\p
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import org.hibernate.Criteria; t~ {O)tt
import org.hibernate.HibernateException; ( 5!'42
import org.hibernate.Session; 2JK
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import org.hibernate.criterion.DetachedCriteria; s_y8+BJaV
import org.hibernate.criterion.Projections; vcu@_N 1Dc
import KuJ9bn{u!C
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org.springframework.orm.hibernate3.HibernateCallback;
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import <w^u^)iLy1
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org.springframework.orm.hibernate3.support.HibernateDaoS H};1>G4
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upport; tNFw1&
8B*(P>
import com.javaeye.common.util.PaginationSupport; _$AM=?P&
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public abstract class AbstractManager extends ];w}?LFb
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HibernateDaoSupport { 4q] 6[/
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privateboolean cacheQueries = false; gNW+Dq|X%
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privateString queryCacheRegion; C,+
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publicvoid setCacheQueries(boolean ;'{7wr|9
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cacheQueries){ q~> +x?30
this.cacheQueries = cacheQueries; Y!xPmL^]?
} ~b]enG5xS4
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publicvoid setQueryCacheRegion(String &7\}Sqp
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queryCacheRegion){ y]yl7g =~
this.queryCacheRegion = t)W=0iEd9
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queryCacheRegion; K^<?LXJF
} H[.)&7M\
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publicvoid save(finalObject entity){ SN@>m pcJS
getHibernateTemplate().save(entity); -OJ <Lf+"=
} !+3&%vQ)
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publicvoid persist(finalObject entity){ 3;L$&X2
getHibernateTemplate().save(entity); D'!JV1Q
} 01o<eZ,
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publicvoid update(finalObject entity){ #3*cA!V.<
getHibernateTemplate().update(entity); iHNQxLkk{:
} cVx SO`jZw
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publicvoid delete(finalObject entity){ AwG0E`SU
getHibernateTemplate().delete(entity); )dfhy
} ]^"Lc~w8&
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publicObject load(finalClass entity, yQ/O[(
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finalSerializable id){ [4#HuO@h
return getHibernateTemplate().load >;9g`d
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(entity, id); 1"CWEL`i
} 7u;N/@
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publicObject get(finalClass entity, /#vt\I<x
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finalSerializable id){ ;MGm,F,o
return getHibernateTemplate().get s@:Yu
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(entity, id); -KC@M
} @}6<,;|DQ
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publicList findAll(finalClass entity){ W)ug%@ )
return getHibernateTemplate().find("from #EUT"^:d
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" + entity.getName()); qZ!kVrmg&
} @>(JC]HtR
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publicList findByNamedQuery(finalString Y}BP]#1
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namedQuery){ TXM/+sd
return getHibernateTemplate H^kOwmSzh
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().findByNamedQuery(namedQuery); hkl0N%[
} &Y1h=,KR9
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publicList findByNamedQuery(finalString query, "Q+wO+}6
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finalObject parameter){ fUf1G{4
return getHibernateTemplate %iNgHoH
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().findByNamedQuery(query, parameter); ffk>IOH
} w!<e#Z]3b
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publicList findByNamedQuery(finalString query, 3M?O(oO
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finalObject[] parameters){ <m \Y$Wv
return getHibernateTemplate xkFa
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().findByNamedQuery(query, parameters); rPy,PQG2w
} 6t7FklM%
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publicList find(finalString query){ c[2ikI,n[
return getHibernateTemplate().find G HQ~{
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(query); %|+aI?
} _YlyS )#@
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publicList find(finalString query, finalObject \y271}'
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parameter){ *J^FV^E``
return getHibernateTemplate().find 3}V (8
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(query, parameter); Qa/1*Mb
} Da)p%E>Q
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public PaginationSupport findPageByCriteria f{2UL ?y
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(final DetachedCriteria detachedCriteria){ #QsJr_=
return findPageByCriteria Hc8^w6S1@
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); "Ia.$,k9
} J#H,QYnf(L
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public PaginationSupport findPageByCriteria g]h@U&`~u_
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(final DetachedCriteria detachedCriteria, finalint eXsp0!v
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startIndex){ *MfH\X379
return findPageByCriteria A-B>VX
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(detachedCriteria, PaginationSupport.PAGESIZE, T]Q4=xsv
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startIndex); shdzkET8N
} WYRC_U7
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public PaginationSupport findPageByCriteria c]1AM)xo
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(final DetachedCriteria detachedCriteria, finalint 1F>8#+B/W
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pageSize, e~*tQ4
finalint startIndex){ n&&C(#mBC
return(PaginationSupport) :Nf(:D8
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getHibernateTemplate().execute(new HibernateCallback(){ %I`'it2d
publicObject doInHibernate }9U_4k
@$kzes\
(Session session)throws HibernateException { a5m[
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Criteria criteria = ~Fo2M wE2~
id+EBVHAd
detachedCriteria.getExecutableCriteria(session); :I/9j=@1
int totalCount = HZ!<dy3
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((Integer) criteria.setProjection(Projections.rowCount q;QasAQS`p
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()).uniqueResult()).intValue(); n|T$3j)
criteria.setProjection y+$vHnS/jC
9
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(null); 1NZpd'$c
List items = L~h:>I+pG
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criteria.setFirstResult(startIndex).setMaxResults vMX\q
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(pageSize).list(); 3rZPVR$))
PaginationSupport ps = GNwFB)?j
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new PaginationSupport(items, totalCount, pageSize, !"/"Mqs3$
8z|]{XW{
startIndex); OcpvY~"Pr
return ps; \Js*>xA
} +3AX1o%p,#
}, true); KCbOO8cQS
} =],c$)
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public List findAllByCriteria(final (I;81h`1G
QCDica `+*
DetachedCriteria detachedCriteria){ *
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return(List) getHibernateTemplate <
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().execute(new HibernateCallback(){ >e.vUUQ{
publicObject doInHibernate 9' H\-
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(Session session)throws HibernateException { 3 %r*~#nz
Criteria criteria = 45Zh8 k
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detachedCriteria.getExecutableCriteria(session); *yZta:(w-W
return criteria.list(); >}0H5Q8@
} 1PWi~1q{Q
}, true); 3AP=
} Yc)Dx3
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public int getCountByCriteria(final :KRNLhWb
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DetachedCriteria detachedCriteria){ 6v}q @z
Integer count = (Integer) T8*;?j*@
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getHibernateTemplate().execute(new HibernateCallback(){ xrNe:Aj
publicObject doInHibernate &F;bg
2.@IfBF6
(Session session)throws HibernateException { Z 6WNMQ1:
Criteria criteria = #U3q
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detachedCriteria.getExecutableCriteria(session); Xa"I
return -!T24/l
nnu#rtvZp}
criteria.setProjection(Projections.rowCount 6&LmR75C
6>&(OV
()).uniqueResult(); |XQ\c.A
} |{%$x^KyJ
}, true); *cXi*7|=
return count.intValue(); s nNd7v.U6
} 3:sx%Ci/2
} @b5$WKPX
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用户在web层构造查询条件detachedCriteria,和可选的 :UKc:JVNM
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ycIcM~<4
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PaginationSupport的实例ps。 r M}o)
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ps.getItems()得到已分页好的结果集 CNWA!1n^Hy
ps.getIndexes()得到分页索引的数组 i}|jHlv
ps.getTotalCount()得到总结果数 ?aB%h
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ps.getStartIndex()当前分页索引 }KftVnD?
ps.getNextIndex()下一页索引 SFEDR?s
ps.getPreviousIndex()上一页索引 (A?w|/bZd
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 64'sJc.
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 (\
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一下代码重构了。 ME5M;bz(
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我把原本我的做法也提供出来供大家讨论吧: Kb/qM}jS
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首先,为了实现分页查询,我封装了一个Page类: rNke&z:%X_
java代码: @!!5el {
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/*Created on 2005-4-14*/ E;k$ICOXA
package org.flyware.util.page; }1a(*s,s-^
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/** KfC{/J\
* @author Joa mZnsr@KF
* >V%.=})K
*/ NXS$w{^
publicclass Page { +t]Ge
>S
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/** imply if the page has previous page */ +}mj;3i
privateboolean hasPrePage; (K ]wk9a
,a0RI<D
/** imply if the page has next page */ fQw=z$
privateboolean hasNextPage; lm{4x~y$h
x%dVD
/** the number of every page */ eQfXUpk3@I
privateint everyPage; T&<ee|t@{
y"_rDj`
/** the total page number */ O^3XhTW^\~
privateint totalPage; aOUTKyR ~
*iSE)[W
/** the number of current page */ $>wN:uN(
privateint currentPage; +
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|uM=pm;H
/** the begin index of the records by the current :prx:7
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query */ 9T2y2d!X
privateint beginIndex; x|Ms2.!
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$/E{3aT@F2
/** The default constructor */
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public Page(){ G2=dq
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} `0 u)/s$
530Kk<%^}8
/** construct the page by everyPage ' 1dhdm8
* @param everyPage c11;(
* */ -(#`JT8
public Page(int everyPage){ 0OtUb:8LX
this.everyPage = everyPage; c'bh`H4
} R0GD9
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/** The whole constructor */ ?uF3Q)rCk
public Page(boolean hasPrePage, boolean hasNextPage, ftV~!r
@,]$FBT"5
!Okl3
!fC
int everyPage, int totalPage, ny<D1>{90
int currentPage, int beginIndex){ M'NOM>8
this.hasPrePage = hasPrePage; +N|t:8qaf
this.hasNextPage = hasNextPage; Ozsvsa
this.everyPage = everyPage; AG Gxx?I
this.totalPage = totalPage; W7\UZPs5t
this.currentPage = currentPage; *4Z! 5iOs
this.beginIndex = beginIndex; }C
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} "2"2qZ*h}
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/** AbX#wpp!
* @return
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* Returns the beginIndex. +4[Je$qYa
*/ 0.U-
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publicint getBeginIndex(){ (J
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return beginIndex; iW[%|ddk
} _6aI>b#yL
?nM]eUAP
/** TH~"y
* @param beginIndex j:2*hF!E
* The beginIndex to set. l%
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*/ d @b ]/
publicvoid setBeginIndex(int beginIndex){ e,*@+E\4
this.beginIndex = beginIndex; `mS0]/AV/
} 7aHP;X~0
)s
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/** | tFg9RT
* @return ~#=70
* Returns the currentPage. Ece=loV*l
*/ hz-^9U
publicint getCurrentPage(){ U@LIw6B!KL
return currentPage; iu`B8yI
} T^2o'_:
q9nQ/]rkHF
/** MX|@x~9W
* @param currentPage _u#r;h[
* The currentPage to set. 5^N`~
*/ h0-CTPQ7A
publicvoid setCurrentPage(int currentPage){ u)Vn7zh
this.currentPage = currentPage; c:-n0m'i
} V~QOl=`K:
L,sXJ23.
/** I\=&v^]
* @return 9*(uJA
* Returns the everyPage. K6nNrd}p:
*/ \IOF 9)F
publicint getEveryPage(){
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return everyPage; ]QF*\2b-I2
} VB=jKMi
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/** 'D^@e0.3
* @param everyPage a.XMeB
* The everyPage to set. jq(rnbV
*/ u/`
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publicvoid setEveryPage(int everyPage){ 8@KGc
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this.everyPage = everyPage;
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} YcM0A~<
p'=XW#2 >
/** R1Q~UX]d=
* @return or[! C%
* Returns the hasNextPage. 2'}/aL|G
*/ w2V:g$~,
publicboolean getHasNextPage(){ 2&2t8.<
return hasNextPage; ;Hu`BFXyD
} I5W#8g!{
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/** |1m2h]];Q
* @param hasNextPage odTIz{9qG
* The hasNextPage to set. stq%Eg?
*/ lkQ(?7
publicvoid setHasNextPage(boolean hasNextPage){ >oyZD^gj
this.hasNextPage = hasNextPage; PC& (1kJ
} jB\Knxm v
.:Zb~
/** (l)r.Vj
* @return Jwbb>mB!
* Returns the hasPrePage. 1sXVuto
*/ Az6tu <
publicboolean getHasPrePage(){ ohPDknHp
return hasPrePage; bO
}9/Ay
} rG'W#!^*
#mRT>]di`D
/** ]mx1djNA
* @param hasPrePage Gyy?cn6_
* The hasPrePage to set. Yo,n#<37
*/ h:r:qk
publicvoid setHasPrePage(boolean hasPrePage){ E<tJ8&IGk
this.hasPrePage = hasPrePage; bD V/$@p
} gnw?Y 2
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/** f<Yg_ TG
* @return Returns the totalPage. d-B,)$zE
* }IV=qW,
*/ AL[,&_&uV
publicint getTotalPage(){ -\8v{ry
return totalPage; !InC8+be
} W>E|Iv[o
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/** P"Y7N?\](
* @param totalPage TL: 6Pe
* The totalPage to set. R(GL{Dh}L
*/ +3r4GEa
Z
publicvoid setTotalPage(int totalPage){ +w(B9rH
this.totalPage = totalPage; )8V=!73
} G4J)o?:m@
uVzvUz{b
} 2E@y0[C?
-~^sSLrbP
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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 m 8P`n
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个PageUtil,负责对Page对象进行构造: :E2 ww`
java代码: 2@|,VN V6~
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/*Created on 2005-4-14*/ '~AR|8q?
package org.flyware.util.page; tIo
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qu
import org.apache.commons.logging.Log; ulNMqz\.
import org.apache.commons.logging.LogFactory; J,t`ilT
Lwkl*
/** !5>PZ{J
* @author Joa %G'P!xQhy
* ?l^NKbw
*/ 8]xYE19=
publicclass PageUtil { S.*LsrSV
_''9-t;n,
privatestaticfinal Log logger = LogFactory.getLog k6(0:/C
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(PageUtil.class); sQLjb8!7
.hK:-q,
/** ,(z"s8N
* Use the origin page to create a new page h|OWtf4
* @param page `"y:/F"{
* @param totalRecords @$5=4HA
* @return 1i;#cIG
*/ X1^Q1?0
publicstatic Page createPage(Page page, int #E4|@}30`
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totalRecords){ &|fWtl;43
return createPage(page.getEveryPage(), 'oF ('uR
*)s^+F 0
page.getCurrentPage(), totalRecords); ]+T$D
} Lm'+z97
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/** FA}y"I'W
* the basic page utils not including exception \-r"%@OkW
fY!9i5@'
handler nt*K@
* @param everyPage `a9iq>
* @param currentPage il$eO 7
* @param totalRecords |P7FPmn
* @return page t/h,-x
*/ Sgn<=8,6c
publicstatic Page createPage(int everyPage, int 'j\mz5#s
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currentPage, int totalRecords){ =!IoL7x
everyPage = getEveryPage(everyPage); _a zJ>
currentPage = getCurrentPage(currentPage); pg{cZ1/
int beginIndex = getBeginIndex(everyPage, NF'<8{~
_Oy;:XN
currentPage); N, 4hh?
int totalPage = getTotalPage(everyPage, O[ F
/&zlC{:G92
totalRecords); 1Hs'YzvY
boolean hasNextPage = hasNextPage(currentPage, UD ;UdehC
+IG=|X
totalPage); "pc
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boolean hasPrePage = hasPrePage(currentPage); gB]jLe
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returnnew Page(hasPrePage, hasNextPage, I !O5+Er
everyPage, totalPage, |cL,$G
currentPage, )Kq@ m1>@
,91 n
beginIndex); 0e(4+:0
} iKG,"
)&qr2Cm*
privatestaticint getEveryPage(int everyPage){ e//jd&G