Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 o ?`LZd:{
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 z 0-[ RGg
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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 87ptab@
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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
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分页支持类: ?Hrj}K27
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java代码: h{/lW#[
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package com.javaeye.common.util; W6!o=()
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import java.util.List; "59"HVV
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publicclass PaginationSupport { SFkB,)Z N
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publicfinalstaticint PAGESIZE = 30; go!jx6~;x
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privateint pageSize = PAGESIZE; M}\p/r=
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privateList items; m;oCi}fL
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privateint totalCount; O3En+m~3n)
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privateint[] indexes = newint[0]; qL2Sv(A Z!
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privateint startIndex = 0; I/k/5
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public PaginationSupport(List items, int eEZZ0NNe;
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totalCount){ s#4Q?<65u
setPageSize(PAGESIZE); %j.
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setTotalCount(totalCount); _BPp=(|
setItems(items); -40s
setStartIndex(0); ::k
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} y*vg9`$k
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public PaginationSupport(List items, int rvRIKc|}l
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totalCount, int startIndex){ v%4zP%4Ak[
setPageSize(PAGESIZE); * amZ
setTotalCount(totalCount); "YoFUfaNg
setItems(items); Z11I1)%s
setStartIndex(startIndex); :)j& t>aP
} +BgUnu26
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public PaginationSupport(List items, int xW+XN`77
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totalCount, int pageSize, int startIndex){ @ev8"JZ1
setPageSize(pageSize); (P|k$S?m
setTotalCount(totalCount); FKU)# Eo
setItems(items); &.chqP(|
setStartIndex(startIndex); ueu=$.^;g
} ~^v*f
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publicList getItems(){ a'|/=$
return items; p.RSH$]
} ~M9&SDT/lB
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publicvoid setItems(List items){ ZeE(gtM
this.items = items; b.mWB`59
} dhmrh5Uf
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publicint getPageSize(){ +1>\o|RF
return pageSize; 3fq'<5 ^
} EE,C@d!*k7
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publicvoid setPageSize(int pageSize){ 6T-iBJT
this.pageSize = pageSize; QB6.
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} 6(-c$d`C.0
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publicint getTotalCount(){ 3&5AbIZ
return totalCount; [9,34/i
} my*E7[
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publicvoid setTotalCount(int totalCount){ fk'DJf[M
if(totalCount > 0){ Q|tzA10E
this.totalCount = totalCount; =0_((eXwf
int count = totalCount / Je#vu`.\\
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pageSize; !WNO!S0/j
if(totalCount % pageSize > 0) 2O
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count++; 9ve)+Lk
indexes = newint[count]; z2god 1"
for(int i = 0; i < count; i++){ Pw/$
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indexes = pageSize * `(VVb@:o
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} )mE67{YJh~
}else{ 0uhIJc'2
this.totalCount = 0; Ep8 y
} /9(8ML#E
} v.{I^=
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publicint[] getIndexes(){ ?Y'r=Q{w
return indexes; b*dEX%H8sf
} l4Q v$
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publicvoid setIndexes(int[] indexes){ R~d{Yv
this.indexes = indexes; PLs(+>H
} 8Lh[>|~=
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publicint getStartIndex(){ &d i=alvv1
return startIndex; eN-lz_..7
} U_1N*XK6$
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publicvoid setStartIndex(int startIndex){ _{48s8V
if(totalCount <= 0) {14sI*b16
this.startIndex = 0; 7oFA5T _
elseif(startIndex >= totalCount) X:d[eAu0
this.startIndex = indexes V(<(k,8=
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[indexes.length - 1]; n%I9l]
elseif(startIndex < 0) ;ksxz
this.startIndex = 0; _Rey~]iJJ8
else{ .8/W_iC92
this.startIndex = indexes 6I~{~YvB"
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[startIndex / pageSize]; `]m/za%7
} .9KW|(uW
} g@IYD
5 @61=Au
publicint getNextIndex(){ `)_11ywZ
int nextIndex = getStartIndex() + 5H
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pageSize; .}DL%E`n
if(nextIndex >= totalCount) l$eKV(CZ4
return getStartIndex(); Y~uqKb;A
else "i/3m'<2
return nextIndex; "U%jG`q
} Q5pm^X._j
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publicint getPreviousIndex(){ X^ZUm
int previousIndex = getStartIndex() - Ehf3L |9
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pageSize; *'hvYl/?>
if(previousIndex < 0) f+Da W
return0; i=8){GX4
else ky98Bz%
return previousIndex; {_5PN^J
} o= N_0.
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} @dp1bkU
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抽象业务类 /"%QIy'{
java代码: 60St99@O
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/** ;Z(~;D
* Created on 2005-7-12 =\l7k<
*/ |xQq+e}l<
package com.javaeye.common.business; M=aWL!nJ
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import java.io.Serializable; :g[G&Ds8
import java.util.List; wc5OK0|
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import org.hibernate.Criteria; KU}HVM{
import org.hibernate.HibernateException; :,^pL At
import org.hibernate.Session; K?o} B
import org.hibernate.criterion.DetachedCriteria; k$7@@?<
import org.hibernate.criterion.Projections; 6hs2B5)+
import @|^2 +K/
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org.springframework.orm.hibernate3.HibernateCallback; boR&'yX
import 6:Nz=sw8
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org.springframework.orm.hibernate3.support.HibernateDaoS fYzOT,c
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upport; )A4WK+yD$z
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import com.javaeye.common.util.PaginationSupport; YJ`[$0mam
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public abstract class AbstractManager extends C||A[JOS
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HibernateDaoSupport { t?0D* !D
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privateboolean cacheQueries = false; 3?vasL
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privateString queryCacheRegion; I,r 3.2u
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publicvoid setCacheQueries(boolean u|=G#y;3
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cacheQueries){ 'wAOY
this.cacheQueries = cacheQueries; VX<ZB +R
} N2VF_[l
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publicvoid setQueryCacheRegion(String &DFe+y~PR
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queryCacheRegion){ z+1#p.F$@
this.queryCacheRegion = cK>5!2b
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queryCacheRegion; ,sk;|OAI
} 8kih81tx"U
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publicvoid save(finalObject entity){ O xqbHe
getHibernateTemplate().save(entity); yg "u^*r&
} )}?'1ciHI
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publicvoid persist(finalObject entity){ aT F}
getHibernateTemplate().save(entity); &{* [7Ad
} !>/U6h,_
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publicvoid update(finalObject entity){ pN&Dpz^
getHibernateTemplate().update(entity); o:#MP(h,N
} {t[j>_MYw
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publicvoid delete(finalObject entity){ KS'? DO
getHibernateTemplate().delete(entity); Mno4z/4{A
} _U$d.B'*)z
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publicObject load(finalClass entity, p[&'*"o!/
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finalSerializable id){ ~LHG
return getHibernateTemplate().load uKh),@JV
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(entity, id); +"T?.,
} w*Sl
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publicObject get(finalClass entity, bWwc2##7jo
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finalSerializable id){ }9>W41
return getHibernateTemplate().get '(kGc%
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(entity, id); HlPf
} 'wLQ9o%=p|
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publicList findAll(finalClass entity){ !iCY!:
return getHibernateTemplate().find("from r.[!n)*
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" + entity.getName()); LnxJFc:1K
} yu<sd}@
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publicList findByNamedQuery(finalString 6N :fq
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namedQuery){ 7
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return getHibernateTemplate :Y0*P
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().findByNamedQuery(namedQuery); }9aYU;9D
} y!."FoQ
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publicList findByNamedQuery(finalString query, 7$a,pNDw
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finalObject parameter){ *rK}Ai
return getHibernateTemplate w8kp6_i'
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().findByNamedQuery(query, parameter); N{tNe-5
} pz6fL=Xd
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publicList findByNamedQuery(finalString query, n87B[R
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finalObject[] parameters){ +S5"4<
return getHibernateTemplate \d2Ku10v[
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().findByNamedQuery(query, parameters); *ELbz}Q
} w{UVo1r:
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publicList find(finalString query){ 35?et-=w
return getHibernateTemplate().find s|dcO
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(query); w
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} ^0R.'XL
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publicList find(finalString query, finalObject D4ESo)15'
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parameter){ ow!utAF
return getHibernateTemplate().find xJa
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(query, parameter); Nj5Mc>_
} 'mXf8
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public PaginationSupport findPageByCriteria c]v$C&FX
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(final DetachedCriteria detachedCriteria){ h<f_Eoz-a
return findPageByCriteria D/'kYoAEO
#;)Oi9{9;
(detachedCriteria, PaginationSupport.PAGESIZE, 0); (y[+s?;WyB
} 4`yCvPu
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public PaginationSupport findPageByCriteria [ma'11?G
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(final DetachedCriteria detachedCriteria, finalint :Gsh
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startIndex){ `|Pfa
return findPageByCriteria 5f(yF
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(detachedCriteria, PaginationSupport.PAGESIZE, O; 7`*}m
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startIndex); "-88bF~
} I} m\(TS-"
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public PaginationSupport findPageByCriteria OS;qb:;
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(final DetachedCriteria detachedCriteria, finalint epI&R) ]
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pageSize, rG|lRT3-K
finalint startIndex){ {?!=~vp
return(PaginationSupport) _dky+ E
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getHibernateTemplate().execute(new HibernateCallback(){ 5R\{&
publicObject doInHibernate C#d.3t
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(Session session)throws HibernateException { }:<`L\8q\
Criteria criteria = 4$#nciAe
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detachedCriteria.getExecutableCriteria(session); i t.Lh'N;T
int totalCount = UmUw>+A
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((Integer) criteria.setProjection(Projections.rowCount >?aPXC
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()).uniqueResult()).intValue(); mSF>~D1_
criteria.setProjection VW: WB.K$
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(null); .<%2ON_
List items = ^aYlu0Wm
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criteria.setFirstResult(startIndex).setMaxResults G_vWwH4XtL
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(pageSize).list(); 3eT5~Lbs
PaginationSupport ps = a9]F.Jm
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new PaginationSupport(items, totalCount, pageSize, tIn
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startIndex); ]^j:}#R
return ps; wX5Yo{
} 2[!#Xf
}, true); hEUS&`K
} HY-7{irR~
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public List findAllByCriteria(final zG-pqE6
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DetachedCriteria detachedCriteria){ j3>0oe!
return(List) getHibernateTemplate e.-+zkQ8EI
cjK\(b3
().execute(new HibernateCallback(){ [PG#5.jwQ
publicObject doInHibernate zwJB.4@
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(Session session)throws HibernateException { dpG l
Criteria criteria = >=Bl/0YH
lw+Y_;
detachedCriteria.getExecutableCriteria(session); ASGV3r(
return criteria.list(); {zzc/!|
} X!H[/b:1O
}, true); @jh\yj rW
} OM,Dy&Y
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public int getCountByCriteria(final %!DdjC&5*
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DetachedCriteria detachedCriteria){ QguRU|y
Integer count = (Integer) 7`eg;s^
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getHibernateTemplate().execute(new HibernateCallback(){ S
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publicObject doInHibernate 0\tV@ 6p2=
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(Session session)throws HibernateException { D+4oV6}~
Criteria criteria = Yr!@p Hy
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detachedCriteria.getExecutableCriteria(session); ;OC~,?O5
return oZ]^zzoEcg
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criteria.setProjection(Projections.rowCount $-^
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()).uniqueResult(); ohEIr2
} F:$*0!
}, true); 2/o_,k
return count.intValue(); ^*?mb)
} O q3aboAt
} D[jPz0
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用户在web层构造查询条件detachedCriteria,和可选的 ~ eNKu
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 `@<>"ff#F
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PaginationSupport的实例ps。 M{GT$Q
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ps.getItems()得到已分页好的结果集 }BYs.$7
ps.getIndexes()得到分页索引的数组 . E8Gj'yO
ps.getTotalCount()得到总结果数 d\O*Ol*/v
ps.getStartIndex()当前分页索引 s2=`haYu
ps.getNextIndex()下一页索引 {!0f.nv
ps.getPreviousIndex()上一页索引 i<\WRzVT
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} "QL"%
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 bU4l|i;j
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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 ]0o_-
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一下代码重构了。 k,,Bf-?
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我把原本我的做法也提供出来供大家讨论吧:
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首先,为了实现分页查询,我封装了一个Page类: Cfr2~w
java代码: F:~k4uTW\b
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/*Created on 2005-4-14*/ 61SbBJ6[
package org.flyware.util.page; =w;~1i%.k
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/** `G'Z,P-a
* @author Joa M
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* |=u
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*/ 4e20\q_{
publicclass Page { 50`=[l`V
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/** imply if the page has previous page */ jR[b7s
privateboolean hasPrePage; Ir6(EIwx0
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/** imply if the page has next page */ Vi=u}(*
privateboolean hasNextPage; B<{Yj}..
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/** the number of every page */ (jI _Dk;
privateint everyPage; GIM'H;XG
#O1%k;BL
/** the total page number */ mS?W+jy%
privateint totalPage; 9,jFQb(),
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/** the number of current page */ nPR*mbW
privateint currentPage; cI\&&<>SlG
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/** the begin index of the records by the current oiRrpS\T.
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query */ 'wA4yJ<
privateint beginIndex; {
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/** The default constructor */ .+A2\F.^
public Page(){ o?|
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} nN%Zed2O@6
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/** construct the page by everyPage m;cgX#k5
* @param everyPage *@eZt*_
* */ bH}?DMq]O
public Page(int everyPage){ w6
this.everyPage = everyPage; \R[f< K%
} ,1
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/** The whole constructor */ [:M Fx6
public Page(boolean hasPrePage, boolean hasNextPage, 0bfJD'^9RP
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@(CJT-Ak
int everyPage, int totalPage, E$C0\O!7
int currentPage, int beginIndex){ m% %\k
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this.hasPrePage = hasPrePage; VmON}bb[zz
this.hasNextPage = hasNextPage; MlV3qM@
this.everyPage = everyPage; =rN_8&
this.totalPage = totalPage; 9Pql\]9"o
this.currentPage = currentPage; 6KE?@3;Om
this.beginIndex = beginIndex; U>hpYqf_
} MZvxcr{x
Rm[{^V.Z$
/** 2*@@Bw.XA
* @return 5H2Ugk3
* Returns the beginIndex. ],F@ .pg
*/ ,zOv-pH
publicint getBeginIndex(){ si1Szmx,
return beginIndex; PouWRGS_
} 2gJkpf9JN
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/** QV>hQ]L
* @param beginIndex XP(fWRT1
* The beginIndex to set. \:jJ{bl^A
*/ LMaY}m>
publicvoid setBeginIndex(int beginIndex){ MDauHtF,
this.beginIndex = beginIndex; h\/T b8
} `s8!zy+
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/** G O[u
* @return _F`RwBOjs
* Returns the currentPage. X\1.,]O >
*/ 8X#\T/U
publicint getCurrentPage(){ cuQAXqXC@
return currentPage; lZJbQ=K{
} ^=ar Kp,?5
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/** aa&\HDh *
* @param currentPage ;4<!vVf e
* The currentPage to set. t_hr$ {
*/ ^Is#_Z|
publicvoid setCurrentPage(int currentPage){ 15_Px9
this.currentPage = currentPage; +:&|]$8<
} :+Tvq,/"
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/** \<%?=C'w~
* @return JgMYy,q8t
* Returns the everyPage. +jyWqld.K1
*/ Lnc>O'<5P9
publicint getEveryPage(){ [! YSW'
return everyPage; SquuK1P=
} -d*je{c|
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/** HFW8x9Cc
* @param everyPage v5 I}a7
* The everyPage to set. P( 1Z
*/ ;v m$F251
publicvoid setEveryPage(int everyPage){ F/:Jp3@
this.everyPage = everyPage; i\C~]K~O!
} =2/[n8pSsM
.9!?vz]1
/** "bA8NQIP
* @return 9uW\~DwsZ%
* Returns the hasNextPage. mI,!8#
*/ :xZ^Jq91
publicboolean getHasNextPage(){ Ja{[T
return hasNextPage; fBnlB_}e
} u5A$VRMN
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/** vJsx_i\i
* @param hasNextPage aH*5(E]
* The hasNextPage to set. 1? Im"
*/ <CN+VXF
publicvoid setHasNextPage(boolean hasNextPage){ dPmNX-'7
this.hasNextPage = hasNextPage; %<h+_(\h
} wqAj=1M\
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/** O[^u<*fi{
* @return :\KJw
* Returns the hasPrePage. ]SG(YrF
*/ `:kI@TPI_C
publicboolean getHasPrePage(){ WoWmmZ
return hasPrePage; &5Huv?^a'
} t{Z:N']H
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/** qHE( p+]E
* @param hasPrePage ?U(`x6\:
* The hasPrePage to set. @WICAC=
*/ JQH>{OB
publicvoid setHasPrePage(boolean hasPrePage){ =4804N7
this.hasPrePage = hasPrePage; ,_I#+XiXY
} 1Ts$kdO
\kG;T=H
/** ?K=
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* @return Returns the totalPage. %Mr^~7nN
* !@9G9<NK
*/ ,7ZV;f81
publicint getTotalPage(){ 6HRr4NDcj
return totalPage; ,L$,d
} Y(6 p&I
9K4Jg]?
/** DGO\&^GT^
* @param totalPage b9 TsuY
* The totalPage to set. O^sOv!!RH/
*/ xMHu:,ND
publicvoid setTotalPage(int totalPage){ |6!L\/}M%
this.totalPage = totalPage; /Gvd5
} ;}4^WzmK^(
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} %>EM ^Z
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 i]}`e>fF
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个PageUtil,负责对Page对象进行构造: YOQ>A*@4
java代码: s> JWNP
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/*Created on 2005-4-14*/ Fm4)|5
package org.flyware.util.page; UpS7>c7s
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import org.apache.commons.logging.Log; agj_l}=gO
import org.apache.commons.logging.LogFactory; I:edLg1T
XY!0yAK(!
/** %IK[d#HO
* @author Joa Yqb3g(0
* 3h`_Qv%g
*/ Jo4iWJpK
publicclass PageUtil { \7] SG
k@>y<A{;D
privatestaticfinal Log logger = LogFactory.getLog `}S;_g!
FS7@6I2Ts
(PageUtil.class); @3Gr2/a
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/** uc]`^,`2/
* Use the origin page to create a new page \JbOT%1
* @param page 9}jezLI/3
* @param totalRecords k%%0"+y#a
* @return yhh\?qqy
*/ z~Is
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publicstatic Page createPage(Page page, int |:,i
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totalRecords){ lky5%H
return createPage(page.getEveryPage(), ]4eIhj?
Eh&-b6:
page.getCurrentPage(), totalRecords); ~zhP[qA})
} 5aJd:36I
#TPS?+(
/** 3NSX(gC%
* the basic page utils not including exception `%Dz 8Z
8C8,Q\WV(~
handler q}cm"lO$
* @param everyPage )<[)7`
* @param currentPage 1fqJtP6
* @param totalRecords %![3?|8~
* @return page T,/:5L9
*/ =:_DXGW2H
publicstatic Page createPage(int everyPage, int 9y?)Ga
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currentPage, int totalRecords){ wf2v9.;X:<
everyPage = getEveryPage(everyPage); &NH[b1NMr
currentPage = getCurrentPage(currentPage); x*!%o(G
int beginIndex = getBeginIndex(everyPage, qu%}b>
x &*2R#Ai
currentPage); vJ{aBx`VS
int totalPage = getTotalPage(everyPage, SaFNPnk=
1"f)\FPGe
totalRecords); ^T*'B-`C7X
boolean hasNextPage = hasNextPage(currentPage, y&6 pc
p mUG`8SY
totalPage); vbEO pYCS
boolean hasPrePage = hasPrePage(currentPage); Zmz $
hr
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returnnew Page(hasPrePage, hasNextPage, #j4RX:T*[
everyPage, totalPage, &vN^*:Q
currentPage, #:s*Hy=
'+v[z=.8]
beginIndex); _B7+n"t\r
} "=,IbC
)`K!XX$%
privatestaticint getEveryPage(int everyPage){ @{U@?6eZ
return everyPage == 0 ? 10 : everyPage; `y$@zT?j
} szGGw
Y(F>;/AA
privatestaticint getCurrentPage(int currentPage){ eS/Au[wS
return currentPage == 0 ? 1 : currentPage; "Z)zKg
} !OV+=Rwdx
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privatestaticint getBeginIndex(int everyPage, int 2?@Ozr2Uh
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currentPage){ t&Jrchk
return(currentPage - 1) * everyPage; 7gE/g`"#
} c7A]\1 ~
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privatestaticint getTotalPage(int everyPage, int N#GMvU#R
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totalRecords){ wL[{6wL
int totalPage = 0; m1Xc3=Y
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if(totalRecords % everyPage == 0) 2]cU:j6G
totalPage = totalRecords / everyPage; J+m1d\lBu
else i2E@5 v=|Y
totalPage = totalRecords / everyPage + 1 ; v(;n|=O
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return totalPage; ZuT5}XxF
} 1F R
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privatestaticboolean hasPrePage(int currentPage){ X3m)
return currentPage == 1 ? false : true; M\9+?
} xM?tdQ~VHY
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privatestaticboolean hasNextPage(int currentPage, soh9Oedml-
(}
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int totalPage){ L:7 kp<E
return currentPage == totalPage || totalPage == <3laNk
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0 ? false : true; <OTx79m
} O?0`QMY
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} BBa!le9P
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<=%=,Yk
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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。 :kvQ3E0
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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 K{0 gkORF
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做法如下: "EnxVV
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 VjJ}q*/3e
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的信息,和一个结果集List: oj[<{/,C9
java代码: C);I[H4Yfw
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/*Created on 2005-6-13*/ %[on.Q'1]2
package com.adt.bo; '#>(JN5\
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