Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 *lY+Yy(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 sx90lsu
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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 _3zU,qm+
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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 Xi*SDy
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。 .^GFy
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分页支持类: eFes+i( 35
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java代码: |H<|{{E
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package com.javaeye.common.util; % M+s{ l
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import java.util.List; TLX^~W[gOm
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publicclass PaginationSupport { 7!mJhgGc
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publicfinalstaticint PAGESIZE = 30; cyDiA(ot&
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privateint pageSize = PAGESIZE; Y<de9Z@
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privateList items; !OV|I
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privateint totalCount; %{=4Fa(Jux
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privateint[] indexes = newint[0]; ,7QBJ_-;QJ
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privateint startIndex = 0; D1"1MUSod
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public PaginationSupport(List items, int 2f s9JP{^0
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totalCount){ #^"hqNwA
setPageSize(PAGESIZE); zkuv\kY/ Z
setTotalCount(totalCount);
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setItems(items); b;SFI^
setStartIndex(0); :17ee
} N=hSqw[
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public PaginationSupport(List items, int YmdsI+DbIu
IJ+O),'
totalCount, int startIndex){ QxP` f KC8
setPageSize(PAGESIZE); ?S+/QyjcfJ
setTotalCount(totalCount); W,0KBkkp
setItems(items); sxf}Mmsk
setStartIndex(startIndex); `#-p,NElV
} Ky=(urAd
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public PaginationSupport(List items, int /5Gnb.zN)
)G}sb*+v?
totalCount, int pageSize, int startIndex){ _SU,f>
setPageSize(pageSize); yz54:q?
setTotalCount(totalCount); O e0KAn
setItems(items); y}3
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setStartIndex(startIndex); 5%vP~vy_}
} 8^&fZL',
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publicList getItems(){ %Z-Tb OX
return items; s?1-$|*
} .H*? '*
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publicvoid setItems(List items){ krnvFZRTQ
this.items = items; !XG/,)A
} o(S^1j5
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publicint getPageSize(){ 6
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return pageSize; x`j_d:C~G
} >d1aE)?
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publicvoid setPageSize(int pageSize){ oW\Q>c7
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this.pageSize = pageSize; X"]mR7k
} FQv02V+&<
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publicint getTotalCount(){ `UzCq06rJ1
return totalCount; E!O(:/*
} ~a0d.dU
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publicvoid setTotalCount(int totalCount){ btkMY<o7
if(totalCount > 0){ -v/?>
this.totalCount = totalCount; 7ZR0M&pX
int count = totalCount / A=l?IC@O
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pageSize; sIQMUC[!
if(totalCount % pageSize > 0) a*e|>p DO
count++; (\AszLW
indexes = newint[count]; g*\v}6
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for(int i = 0; i < count; i++){ ' ]H#0.
indexes = pageSize * |x}&wFV
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} x Ps&CyI
}else{ $4fjSSB~
this.totalCount = 0; \)s 3]/"7
}
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} )l/C_WEK
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publicint[] getIndexes(){ N'q/7jOy
return indexes; gP"Mu#/D
} ".7KEnx
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publicvoid setIndexes(int[] indexes){ 2* cKFv{
this.indexes = indexes; wNlV_
} /E1c#@
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publicint getStartIndex(){ bB[*\
return startIndex; hJL0M!
} R,k[Kh
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publicvoid setStartIndex(int startIndex){ 1\9BO:<K
if(totalCount <= 0) X/C54%T ~
this.startIndex = 0; (\[!,T"[
elseif(startIndex >= totalCount) (Su2\x
this.startIndex = indexes _J$p<
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[indexes.length - 1]; kv FOk
elseif(startIndex < 0) X<bj2 w
this.startIndex = 0; QSQ\@h;E
else{ rD)v%vvr&`
this.startIndex = indexes Ab|NjY:
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[startIndex / pageSize]; h4xf%vA(;
} YuZ
} GA@Q:n8UuR
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publicint getNextIndex(){ V,%5
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int nextIndex = getStartIndex() + [(ib9_`A'1
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pageSize; G"R>a w
if(nextIndex >= totalCount) KPvYq?F>4
return getStartIndex(); XzwQ,+IAr
else $@!&ML
return nextIndex; (E]K)d
} YedipYG9;
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publicint getPreviousIndex(){ %^BOYvPx
int previousIndex = getStartIndex() - 4BL,/(W]
x
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pageSize; .0/Z'.c8
if(previousIndex < 0) n`2"(7Wj
return0; ].+G-<.:
else &:{yf=
return previousIndex; dK`O,[}
} ?At-
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} Ji?UG@
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抽象业务类 EjCs
java代码: KFrmH
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/** Sk%|-T(d$
* Created on 2005-7-12 87*[o
*/ ^IZ0M1&W;
package com.javaeye.common.business; *wx^mB9
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import java.io.Serializable; q.tL'
import java.util.List; 7im;b15j`'
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import org.hibernate.Criteria; cjpl_}'L:
import org.hibernate.HibernateException; P"VLGa
import org.hibernate.Session; +N!{(R:"v}
import org.hibernate.criterion.DetachedCriteria; No+zw% l0E
import org.hibernate.criterion.Projections; q/zdd3a
import I[Y?f8gJ
2}#PDhn
org.springframework.orm.hibernate3.HibernateCallback; >U.uRq
import D(GHkS*0q
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org.springframework.orm.hibernate3.support.HibernateDaoS hY'%SV
p
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upport; hidweg*7
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import com.javaeye.common.util.PaginationSupport; XcneH jpR
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public abstract class AbstractManager extends $cCB%}
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HibernateDaoSupport { [G)Sq;
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privateboolean cacheQueries = false; ,iy
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privateString queryCacheRegion; [Xg"B|FD0
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publicvoid setCacheQueries(boolean ?a(3~dh|
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cacheQueries){ ~VKXL,.
this.cacheQueries = cacheQueries; N<%,3W_-_
} QkAwG[4
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publicvoid setQueryCacheRegion(String $x*GvI1D
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queryCacheRegion){ <hdCO<
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this.queryCacheRegion = i&KODhMpP
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queryCacheRegion; \h4y,sl
} e^TF.D?RS
){~.jP=-#
publicvoid save(finalObject entity){ 4YC`dpO'
getHibernateTemplate().save(entity); wr(?L7
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} I 3PnyNZ
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publicvoid persist(finalObject entity){ <}%*4mv
getHibernateTemplate().save(entity); he #iWD'
} W#Z]mt B
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publicvoid update(finalObject entity){ !/SFEL@_B
getHibernateTemplate().update(entity); YzqhFFaj.
} vP!gLN]TV
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publicvoid delete(finalObject entity){ DQd&:J@?
getHibernateTemplate().delete(entity); Uan;}X7@
} v.MWO]L
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publicObject load(finalClass entity, @B6[RZ R
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finalSerializable id){ J$oJ
return getHibernateTemplate().load AF
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(entity, id); p5\b&~
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} X%sc:V
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publicObject get(finalClass entity, !VW#hc\A5
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finalSerializable id){ 2rk_ ssvs
return getHibernateTemplate().get y<
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(entity, id); @({65 gJ*
} c!c!;(
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publicList findAll(finalClass entity){ y=CemJ[~
return getHibernateTemplate().find("from ]Q+Tm2{
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" + entity.getName()); <M=K!k
} OP@PB|
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publicList findByNamedQuery(finalString \K=Jd#9c
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namedQuery){ <H.Ml>q:r
return getHibernateTemplate :mij%nQ>$
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().findByNamedQuery(namedQuery); g)zy^aDf
} Ky+TgR
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publicList findByNamedQuery(finalString query, j=7 ]"%
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finalObject parameter){ fgNEq
return getHibernateTemplate T"$"`A"
[bAv|;
().findByNamedQuery(query, parameter); qYE -z(i
} +f+\uObi:
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publicList findByNamedQuery(finalString query, RtSk;U1
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finalObject[] parameters){ {W0@lMrD
return getHibernateTemplate A2xORG&FD
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().findByNamedQuery(query, parameters); PS>k67sI
} &.d~
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.; :[sv)
publicList find(finalString query){ [Ga9^e$Zv
return getHibernateTemplate().find il*bsnwpZv
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(query); !d ZHG
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} &cZD{Z
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publicList find(finalString query, finalObject k+&| *!j
)=~1m85+5B
parameter){ sC/T)q2
return getHibernateTemplate().find t&ngOF
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(query, parameter); Y1+f(Q
} mgS%YG
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public PaginationSupport findPageByCriteria m@OgT<E]_
# *\PU
(final DetachedCriteria detachedCriteria){ -BR&b2
return findPageByCriteria 2&dtOyxo>
\ ddbqg?`
(detachedCriteria, PaginationSupport.PAGESIZE, 0); fY\QI
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} 1'M<{h<sP
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public PaginationSupport findPageByCriteria 8eL[,uw
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(final DetachedCriteria detachedCriteria, finalint W*gu*H^s~
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startIndex){ Q9{%
return findPageByCriteria 'R= r9_%
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(detachedCriteria, PaginationSupport.PAGESIZE, 8xlj:5;(w
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startIndex); Z{&PKS
} [K,&s8N5
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public PaginationSupport findPageByCriteria }wz )"
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(final DetachedCriteria detachedCriteria, finalint mq>Ag
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pageSize, @:X~^K.
finalint startIndex){ zAS&L%^ tV
return(PaginationSupport) \%f4)Qb
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getHibernateTemplate().execute(new HibernateCallback(){ (yn!~El3
publicObject doInHibernate {^5r5GB=*
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(Session session)throws HibernateException { qVx0VR1:
Criteria criteria = D O(FG-R
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detachedCriteria.getExecutableCriteria(session); lhKd<Y"
int totalCount = P*Uu)mG)G
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((Integer) criteria.setProjection(Projections.rowCount 3L/>=I{5
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()).uniqueResult()).intValue(); 3;@t{rIin
criteria.setProjection x4Y+?2
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(null); G/bWn@
List items = 0'% R@|
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criteria.setFirstResult(startIndex).setMaxResults :;#Kg_bz
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(pageSize).list(); /k l0(='
PaginationSupport ps = `b+f^6SJn
[89#8|+
new PaginationSupport(items, totalCount, pageSize, !i2=zlpb[
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startIndex); 7_?:R2]n
return ps; [}N?'foLb
} Ul)2A
}, true); W -8<sv$b
} t=d~\_Oa
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public List findAllByCriteria(final Ot`jjZ&
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DetachedCriteria detachedCriteria){ b,cA mZ
return(List) getHibernateTemplate ~6Vs>E4G
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().execute(new HibernateCallback(){ [>=D9I@~
publicObject doInHibernate 1>[3(o3t
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(Session session)throws HibernateException { S`)KC-
Criteria criteria = BOQ2;@:3
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detachedCriteria.getExecutableCriteria(session); ;$wS<zp6
return criteria.list(); By]XD~gcP
} wWKC.N
}, true); s7A{<>:
} >2_BL5<S
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public int getCountByCriteria(final Ia=wf"JS)
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DetachedCriteria detachedCriteria){ . p^='Kz?
Integer count = (Integer) (wdE@/V
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getHibernateTemplate().execute(new HibernateCallback(){ O[+S/6uy
publicObject doInHibernate $W<H[k&(B
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(Session session)throws HibernateException { +ByxhSIr
Criteria criteria = idMb}fw>
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detachedCriteria.getExecutableCriteria(session); #UG| \}Lp
return D}XyT/8G3
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criteria.setProjection(Projections.rowCount O8(;=exA
bHH{bv~Z
()).uniqueResult(); UO47XAO
} : ~"^st_[!
}, true); GNS5v-"H
return count.intValue(); nyWA(%N1
} (cAv :EKpo
} \$}xt`6p
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用户在web层构造查询条件detachedCriteria,和可选的 [X ]\^
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 VI,z7
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PaginationSupport的实例ps。 6^F"np{w
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ps.getItems()得到已分页好的结果集 pN6!IxN$
ps.getIndexes()得到分页索引的数组 %Rj:r!XB:
ps.getTotalCount()得到总结果数 IzF7W?k
ps.getStartIndex()当前分页索引 [X0Wfb}{
ps.getNextIndex()下一页索引 Ap9CQ h=!
ps.getPreviousIndex()上一页索引 XeX0\L')R
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 b2u_1P\
m:5 *:Ii.
,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 ^Crl~~Gk`
p)vyZY[
一下代码重构了。 9-[g/qrF
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我把原本我的做法也提供出来供大家讨论吧: XKN`{h-@
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首先,为了实现分页查询,我封装了一个Page类: \2 &)b
java代码: mj=$[y(
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/*Created on 2005-4-14*/ L$6{{Tw"2
package org.flyware.util.page; 8`XpcK-0
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/** +Wh0Of
* @author Joa KArt4+31
* z1wy@1o'
*/ c7X5sMM,
publicclass Page { ]n1@!qa48
qFp }+s
/** imply if the page has previous page */ "& 'h\
privateboolean hasPrePage; M%pxv6?""{
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/** imply if the page has next page */ Z12-Vps
privateboolean hasNextPage; /{
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/** the number of every page */ Eh&*"&fHR
privateint everyPage; ^M6xRkI
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/** the total page number */ n,}\;Bp
privateint totalPage; }/q]:3M|
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/** the number of current page */ TbbtD"b?
privateint currentPage; }wRHNBaEB
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/** the begin index of the records by the current V`qHNM/t
Mu$9#[/
query */ mu`h6?v
privateint beginIndex; xU+c?OLi
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/** The default constructor */ H"lq!C`
public Page(){ xR
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} NF+^
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/** construct the page by everyPage 78&(>8@m
* @param everyPage a[d6@!
* */ 9nF;$HB
public Page(int everyPage){ .vHSKd{
this.everyPage = everyPage; #vCtH2
} mTXeIng?
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/** The whole constructor */ <nDuN*|
public Page(boolean hasPrePage, boolean hasNextPage, j"o8]UT/
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9
# rnO=N8
int everyPage, int totalPage, ~k>H4hV3
int currentPage, int beginIndex){ 46`(u"RP
this.hasPrePage = hasPrePage; K. [2uhB)
this.hasNextPage = hasNextPage; MNd8#01q`
this.everyPage = everyPage; A'Q=DoE
this.totalPage = totalPage; S%J $.ge
this.currentPage = currentPage; !9w3/Gthj
this.beginIndex = beginIndex; }4G/x;D
} \yDr
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/** lS<T|:gz@
* @return 17IT:T,'
* Returns the beginIndex. 2P)*Y5`KBH
*/ J*HZ=6L
publicint getBeginIndex(){ +pDZ,c,
return beginIndex; NQb!?w
} 4#D=+70'
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/** `-Yo$b;:
* @param beginIndex ,au-g)IFZ
* The beginIndex to set. =e\E{K'f@
*/ |ci1P[y
publicvoid setBeginIndex(int beginIndex){ $TU)O^c
this.beginIndex = beginIndex; _19x`J3
} @N^?I*|u
q]PeS~PjF\
/** eYSVAj
* @return ynkPI6o
* Returns the currentPage. \~j6}4XS1.
*/ MZ9{*y[z
publicint getCurrentPage(){ !{On_>`,
return currentPage; `2}H$D
} :.xdG>\n3
*hugQh]a
/** Um4$. BKD
* @param currentPage 2Mqac:L
* The currentPage to set. c:;m BS>~
*/ uLr9*nxd
publicvoid setCurrentPage(int currentPage){ [}p/pj=
this.currentPage = currentPage; |n9q4*dN
} m5Q?g8
G'>?/l#
/** k2]Q~
* @return Z]Zs"$q@
* Returns the everyPage. ;;6e
t/8
*/ ykq9]Xqhv
publicint getEveryPage(){ ZH
o#2{F
return everyPage; ]U9f4ODt
} Mv\odf\]
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/** FPg5!O%
* @param everyPage fDq`.ZW)s
* The everyPage to set. pUTC~|j%:
*/ +A3Q$1F
publicvoid setEveryPage(int everyPage){ FrPpRe %!
this.everyPage = everyPage; %Fb4
} y[L7=Td
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/** RU r0K#]
* @return |.8lS3C
* Returns the hasNextPage. V={`k$p
*/ {9 PeBc
publicboolean getHasNextPage(){ x+mfQcSD&
return hasNextPage; |G!P G6%1
} >icL,n"]
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/** vmV<PK-
* @param hasNextPage E`^?2dv+/
* The hasNextPage to set. Ru1I,QvCj"
*/ 8Gw0;Uu8D
publicvoid setHasNextPage(boolean hasNextPage){ 4sj:%%UE
this.hasNextPage = hasNextPage; |fQl0hL
} 2f;fdzjk8K
!A5UT-
/** ?O]iX;2vM
* @return e-}b]\
* Returns the hasPrePage. ]w)*8
w.)
*/ - %ul9} .
publicboolean getHasPrePage(){ |VY+!
return hasPrePage; /1h
0l;
} 8Z^9r/%*Z
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/** ( k@%04c
* @param hasPrePage C2~t
* The hasPrePage to set. $#bgt
*/ @kq~q;F
publicvoid setHasPrePage(boolean hasPrePage){ uk8vecj
this.hasPrePage = hasPrePage; ws{2 0
} (x.O]8GKP
@0XqUcV
/** ~|LlT^C
* @return Returns the totalPage. _N.N?>
* "IK QFt'
*/ HJ&|&tT
publicint getTotalPage(){ m{U+aqAQK
return totalPage; 4 Ar\`{c>
} J9tQ@3{f
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/** pH?tr
* @param totalPage $;9zD11
* The totalPage to set. Lyx \ s;
*/ Cst:5m0!
publicvoid setTotalPage(int totalPage){ 8x`?Yc
this.totalPage = totalPage; ;ew3^i.du
} +) pO82
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} +1 K9R\
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{=(GY@yU/
i7qG5U
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 X[ERlw1q4Q
N2!HkUy2
个PageUtil,负责对Page对象进行构造: Kr$ w"]
java代码: B( ]=I@L=W
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Cf-R?gn]
/*Created on 2005-4-14*/ 6K/j,e>L
package org.flyware.util.page; y4aW8J#
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import org.apache.commons.logging.Log; NJEubC?
import org.apache.commons.logging.LogFactory; jQAK
?7':=
";jj`
/** !N6/l5kn
* @author Joa &