Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 6f^q >YP
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 S1&Df%Ra
Du7DMo=l
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 o+F]80CH
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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 1.6Y=Mh=i[
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。 <>I4wqqb
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分页支持类: "H"4]m1Wc
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java代码: zhW.0:9
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package com.javaeye.common.util; A!n)Fpk
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import java.util.List; .Km6
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publicclass PaginationSupport { 9 U!-Zn!
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publicfinalstaticint PAGESIZE = 30; T>e4Og"?
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privateint pageSize = PAGESIZE; AC& }8w[>u
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privateList items; Uc>$w?oA
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privateint totalCount; ,{rm<M.)
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privateint[] indexes = newint[0]; Vub($
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privateint startIndex = 0; b8$(j2B~
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public PaginationSupport(List items, int 10`]&v]T
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totalCount){ $u-yw1FT
setPageSize(PAGESIZE); F `cuV
setTotalCount(totalCount); D1g
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setItems(items); b,MzHx=im
setStartIndex(0); z&@O\>Q
} "T0s7LWp
i*9Bu;
public PaginationSupport(List items, int SZ )AO8&
,]* MI"
totalCount, int startIndex){ 6'YsSde".
setPageSize(PAGESIZE); NKJ+DD:'
setTotalCount(totalCount); fAHf}j
setItems(items); {T2=bK~
setStartIndex(startIndex); fRT4,;
} 0Xx&Z8E
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public PaginationSupport(List items, int kH9P(`;Vq
.*_uXQ
totalCount, int pageSize, int startIndex){ O>)Fl42IeD
setPageSize(pageSize); p.50BcDg
setTotalCount(totalCount); SuuLB6{u3
setItems(items); d>OLnG>
F
setStartIndex(startIndex); jXCSD@?]K
} {=)g?!zC
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publicList getItems(){ D<SLv,Y
return items; CQGq}.Jt!
} qo^PS
@}[yC['
publicvoid setItems(List items){ {!G
this.items = items; kl/eJN'S
} Z#nPn>,q
(s?Rbd
publicint getPageSize(){ 8kA2.pIk
return pageSize; ZT'VF~
} 9S8>"w^R
2$OI(7b=
publicvoid setPageSize(int pageSize){ d=~-8]%\
this.pageSize = pageSize; ?^l{t4
} rm"C|T4:V
b IZuZF>*
publicint getTotalCount(){ L2GUrf
return totalCount; ln~;Osb
} M}cgVMW
5:r*em
publicvoid setTotalCount(int totalCount){ A\IQM^i
if(totalCount > 0){ EJ&aT etQ
this.totalCount = totalCount; <!m'xOD
int count = totalCount / :#I7);ol
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pageSize; ~,jBm^4
if(totalCount % pageSize > 0) sCi"qtHP
count++; y8k*{1MuO
indexes = newint[count]; rr;p;
for(int i = 0; i < count; i++){ VGDds
indexes = pageSize * fVJsVZ"6v`
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i; w4UaWT1J
}
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}else{ S, g/2k*
this.totalCount = 0; &Ub0o2+y
} Nd] w I|>
} }/cMG/%
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publicint[] getIndexes(){ uOU?-WtPz
return indexes; miCW(mbO8
} )4@La&
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publicvoid setIndexes(int[] indexes){ V <;vy&&
this.indexes = indexes; H)u<$y!8
} Frxim
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publicint getStartIndex(){ D;RZE
return startIndex; aOWfu^&H:
} ImnN&[Cu
IC[iCrB
publicvoid setStartIndex(int startIndex){ 6.|Qyk*
if(totalCount <= 0) wy)I6`v
this.startIndex = 0; P*M$^p
elseif(startIndex >= totalCount) nm3/-Q},
this.startIndex = indexes Q
\E[py
n@"h^-
[indexes.length - 1]; /`)>W :
elseif(startIndex < 0) 'i5V6yB
this.startIndex = 0; :kMEL*
else{ Wdp?<U
this.startIndex = indexes 2S`D7R#6s
W\W|v?r
[startIndex / pageSize]; B)1.CHV%<
} )C0dN>Gb
} bF#1'W&
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publicint getNextIndex(){ }>|!Mf]W?R
int nextIndex = getStartIndex() + X?Yp=%%
1`;,_>8
pageSize; 9~FB^3Nz_
if(nextIndex >= totalCount) [p7cgHSMt
return getStartIndex(); }RT#V8oc
else .JG> /+
return nextIndex; FSp57W$
} x9&{@
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publicint getPreviousIndex(){ TAl#V7PF}
int previousIndex = getStartIndex() - E$w2SQ
k-
?:0
pageSize; 'I tsu~fza
if(previousIndex < 0) /6$8djw
return0; `!t+sX-n
else q_sQC5:s
return previousIndex; pO~lVM
} `QIYnokL
[kjm EMF9i
} SW^/\cJ^
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抽象业务类 .^Z^L F
java代码: q!5 *)nw"
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{ 4(E
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/** ee9nfvG-
* Created on 2005-7-12 $d[ xSwang
*/ +}u{{
package com.javaeye.common.business; Gl+Ql?|
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import java.io.Serializable; BWd{xP y
import java.util.List; qg(rG5kD@
h)vRvfcmY
import org.hibernate.Criteria; /61P`1y(J
import org.hibernate.HibernateException; tk"+PTGJT
import org.hibernate.Session; 4IW7^Pq`P
import org.hibernate.criterion.DetachedCriteria; :=I@<@82W
import org.hibernate.criterion.Projections; -X)KY_Xn@/
import ~PoBvHi
@7C?]/8#
org.springframework.orm.hibernate3.HibernateCallback; o,#[Se*n
import FK8GBkQ!
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org.springframework.orm.hibernate3.support.HibernateDaoS -@wnQ?
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upport; %dyE F8)
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import com.javaeye.common.util.PaginationSupport; ?Cu1"bl
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public abstract class AbstractManager extends JpFfO<uO
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HibernateDaoSupport { vWM3JH~a6
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privateboolean cacheQueries = false; h7EKb-@
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privateString queryCacheRegion; 2!Mwui;%
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publicvoid setCacheQueries(boolean QzzV+YG$(4
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cacheQueries){ t:|+U:! >
this.cacheQueries = cacheQueries; s?.A
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} jmcb-=ts
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publicvoid setQueryCacheRegion(String :OF:(,J
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queryCacheRegion){ g' xR$6t
this.queryCacheRegion = q=M\#MlL0'
q 16jL,i
queryCacheRegion; a!;]9}u7
} XYKWOrkQqa
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publicvoid save(finalObject entity){ Whf7J'
getHibernateTemplate().save(entity); 2 us-s
} &*I\~;1
q;))3aQe
publicvoid persist(finalObject entity){ jf&LSK;2
getHibernateTemplate().save(entity); &IQp&
} $uA?c&
e
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publicvoid update(finalObject entity){ sGf\!w
getHibernateTemplate().update(entity); iaqhP7!
} P(_wT:8C?
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publicvoid delete(finalObject entity){ x4PH-f-7
getHibernateTemplate().delete(entity); n\nC.|_G@
} "%c\i-&t
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publicObject load(finalClass entity, d2Z kchf
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finalSerializable id){ H$^b.5K
return getHibernateTemplate().load 9I a4PPEH1
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(entity, id); |P_\l,f8`
} ?UXKy
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publicObject get(finalClass entity, cT8`l!RD<
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finalSerializable id){ p0KkPE">p4
return getHibernateTemplate().get vrtK~5K
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(entity, id); "t<${
} @j%r6N
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publicList findAll(finalClass entity){ oKIry
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return getHibernateTemplate().find("from _}X_^taTZS
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" + entity.getName()); `?Pk~7
} ;79X#hI
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publicList findByNamedQuery(finalString SR9Cl
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namedQuery){ q16RPqfT
return getHibernateTemplate [sC]<2 r
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().findByNamedQuery(namedQuery); ckqU2ETpD}
} G?LPj*=$?
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publicList findByNamedQuery(finalString query, 8K!
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finalObject parameter){ ^h+<Q%'a'
return getHibernateTemplate &qki
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().findByNamedQuery(query, parameter); `~Eo;'( +^
} })OgsBk
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publicList findByNamedQuery(finalString query, $_-f}E
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finalObject[] parameters){ +OFq=M
return getHibernateTemplate `A@{})+
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().findByNamedQuery(query, parameters); N|c;Qzl
} O:fv1
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publicList find(finalString query){ bk E4{P"
return getHibernateTemplate().find }2Y:#{m
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(query); _B`'1tNx
} )v1n#m,W
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publicList find(finalString query, finalObject ':8yp|A|
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parameter){ ,K Ebnk|i
return getHibernateTemplate().find Z(p kj
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(query, parameter); SxLu<
} gc-yUH0I
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public PaginationSupport findPageByCriteria -W(O~AK
1 dT1DcZ
(final DetachedCriteria detachedCriteria){ n?*Fr sZ
return findPageByCriteria z'K&LH
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); SwV{t}I
} 'qS&7
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public PaginationSupport findPageByCriteria *.wX9g9\
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(final DetachedCriteria detachedCriteria, finalint ~:r:?PwWG
q/,>UtRr
startIndex){ EnXNTat})
return findPageByCriteria Jrd:6Z
v*'dA^Q
(detachedCriteria, PaginationSupport.PAGESIZE, 5BCHWX*y
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startIndex); ^>02,X
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} )J4XM(
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public PaginationSupport findPageByCriteria GU'/-6-T
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(final DetachedCriteria detachedCriteria, finalint "ewSh<t
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pageSize, V|3}~(5=
finalint startIndex){ !6hUTjhW7z
return(PaginationSupport) _,:gSDW|
( /{Wu:e
getHibernateTemplate().execute(new HibernateCallback(){ hER]%)#r
publicObject doInHibernate p9k'.H^:_
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(Session session)throws HibernateException { _|`~CLE[
Criteria criteria = ,)3%@MwO
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detachedCriteria.getExecutableCriteria(session); lAU`7uE
int totalCount = wP.b2X_V
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((Integer) criteria.setProjection(Projections.rowCount B2QttcJ
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()).uniqueResult()).intValue(); rf_(pp)
criteria.setProjection H'E(gc)>)
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(null); T9.3
List items = $eUI.j(HU
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criteria.setFirstResult(startIndex).setMaxResults T:&
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(pageSize).list(); o.IJ4'}aN
PaginationSupport ps = e E:J
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new PaginationSupport(items, totalCount, pageSize, R&Y+x;({
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startIndex); 7}>7@W8
return ps; x"q!=&>f
} Z _W.iBF
}, true); ^$-ID6
} `6a
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public List findAllByCriteria(final NuZiLtC
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DetachedCriteria detachedCriteria){ fz'@ON
return(List) getHibernateTemplate cKt=_4Lf
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().execute(new HibernateCallback(){ yO\.dp
publicObject doInHibernate 8,unq3
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(Session session)throws HibernateException { M?m Pi 3
Criteria criteria = M4[(.8iE
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detachedCriteria.getExecutableCriteria(session); ZoJ_I
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return criteria.list(); J:g4ES-/
} ~JhH ,E
}, true); ASA ]7qyO
} IiW*'0H:/
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public int getCountByCriteria(final E Dh$UB)
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DetachedCriteria detachedCriteria){ _Q)rI%A2
Integer count = (Integer) SB"Uu2)wZ
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getHibernateTemplate().execute(new HibernateCallback(){ WUnz
publicObject doInHibernate e$'|EE.=q+
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(Session session)throws HibernateException { g
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Criteria criteria = h`Ld%iN\
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detachedCriteria.getExecutableCriteria(session); &c[.&L,w4
return k# -u!G
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criteria.setProjection(Projections.rowCount _{$eOwB
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()).uniqueResult(); ZSWKVTi
} pjG/`
}, true); 'Lm\ r+$F
return count.intValue(); W}^X;f
} zsM3
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} _,r2g8qm
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用户在web层构造查询条件detachedCriteria,和可选的 oUSv)G.zb
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 R3 Zg,YM
3Lg)237&j
PaginationSupport的实例ps。 s>pM+PoGYd
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ps.getItems()得到已分页好的结果集 hB[VU
";
ps.getIndexes()得到分页索引的数组 |azdFf6A:[
ps.getTotalCount()得到总结果数 C?OqS+
ps.getStartIndex()当前分页索引 !i4/#H
ps.getNextIndex()下一页索引 Lp1\vfU<+
ps.getPreviousIndex()上一页索引 I(rZ(|^A
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 T~D2rt\
uv#."_Va
,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 )\O;Rt(
kg/<<RO
一下代码重构了。 n,Gvgf
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我把原本我的做法也提供出来供大家讨论吧: NC@L,)F
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首先,为了实现分页查询,我封装了一个Page类: -d+o\qp"#
java代码: 8?l/x
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/*Created on 2005-4-14*/ DH IC:6EY
package org.flyware.util.page; ja2BK\"1:
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/** Ns2<wl-
* @author Joa %+8"-u
* cPp<+ ts
*/ z79c30y]"
publicclass Page { j3t,Cx
%3kS;AaA
/** imply if the page has previous page */ Y[~Dj@Q<
privateboolean hasPrePage; 9YQYg@+R
r,8~qHbOT
/** imply if the page has next page */ 8~!9bg6C
privateboolean hasNextPage; `zoC++hx
Z%4w{T+[
/** the number of every page */ BJ*8mKi h
privateint everyPage; G2 {R5F !
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/** the total page number */ SoJ=[5W
privateint totalPage; (8Inf_59
&@U)
/** the number of current page */ -]~KQvIH!
privateint currentPage; *S= c0
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/** the begin index of the records by the current hVGK%HCz&
Ljs4^vy<J
query */ v!WkPvU
privateint beginIndex; yM
PZ}
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/** The default constructor */ Ha41Wn'tZ
public Page(){ E'^$~h$
7=`_UqCV
} /D~MHO{
ir<K"wi(2
/** construct the page by everyPage L (@".{T
* @param everyPage EC8 Fapy
* */ @Wl2E.)K;
public Page(int everyPage){ =N^j:t
this.everyPage = everyPage; ^&!iq K2o
} /cC4K\M
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/** The whole constructor */ ., =\/ C<
public Page(boolean hasPrePage, boolean hasNextPage, c2~oPUj
.|c=]_{
[,TK"
int everyPage, int totalPage, o?`^
UG-
int currentPage, int beginIndex){ L7"B`oa(p
this.hasPrePage = hasPrePage; ^@f-Ni\
this.hasNextPage = hasNextPage; :=oIvSnh
this.everyPage = everyPage; f7v|N)
this.totalPage = totalPage; []<N@a6VA>
this.currentPage = currentPage; I4Rd2G_
this.beginIndex = beginIndex; neBcS[
} qBF}-N_
$,8}3R5}
/** J/>9w
* @return
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* Returns the beginIndex. Xf%wW[~
*/ ojbms>a
publicint getBeginIndex(){ i~ITRi@
return beginIndex; 7*C>4Gs
} W%P$$x5&
<7*d2
/** W{X5~w(
* @param beginIndex 8dlhL8#
* The beginIndex to set. 7OdJ&Gzd
*/ /;;$9O9
publicvoid setBeginIndex(int beginIndex){ "}^}3"/.
this.beginIndex = beginIndex; Z_(P^/
} PM8*/4Cu.5
?F^O7\rw
/** $0,lE+7*
* @return ~vV+)KI
* Returns the currentPage. /7&WFCc)(
*/ {1L{
publicint getCurrentPage(){ u,`cmyZ
return currentPage; >p>B-m
} ~yu\vqN
V7)<MY
/** Q7pjF`wu
* @param currentPage V*%Lc9<d
* The currentPage to set. r68d\N`.
*/ %mNd9 ]<
publicvoid setCurrentPage(int currentPage){ XLj|y#h
this.currentPage = currentPage; 4;)aGN{e
} Psw<9[
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/** 3Q2z+`x'
* @return OR<%h/ \f
* Returns the everyPage. .9$
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+
*/ "W@>lf?"
publicint getEveryPage(){ rtT*2k*
return everyPage; ueLdjASJ
} Rd,5&X$
ij&T\):d
/** 2yPF'Q7u_.
* @param everyPage 1JY3c
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* The everyPage to set. n}3fItSJ
*/ y1t,i.
[
publicvoid setEveryPage(int everyPage){ bq"dKN`
this.everyPage = everyPage; >slGicZ0
} 5uO.@0
]}d.h!`<)
/** iu'At7
* @return >"<<hjKJ
* Returns the hasNextPage. _.+2sm
*/ T3In0LQ
publicboolean getHasNextPage(){ H&=fD` Xq
return hasNextPage; g&fq)d
} <4RP:2#
sG:tyvln
/** A ^X 1
* @param hasNextPage Dz<vIMLF{
* The hasNextPage to set. Q)93+1]
*/ W3]?>sLE*
publicvoid setHasNextPage(boolean hasNextPage){ 6GsB*hW
this.hasNextPage = hasNextPage; 2<TpNGXM_
} E=RX^ 3+}
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/** ?h3t"9
* @return s/0~!0
* Returns the hasPrePage. &e;GoJ
*/ 8=WX`*-uH
publicboolean getHasPrePage(){ (dQsR sA
return hasPrePage;
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} ldRisL
]Nb~-)t%B
/** 2A(IsUtqO:
* @param hasPrePage DNGj8 1'c
* The hasPrePage to set. x?n13C
*/ KpfQ=~'
publicvoid setHasPrePage(boolean hasPrePage){ "q3W&@
this.hasPrePage = hasPrePage; I2e@_[
1
} jI45X22j
.aD=d\
/** 6&[rATU+
* @return Returns the totalPage. >/9on.
* yN9setw*,M
*/ DUWSY?^c
publicint getTotalPage(){ aSQvtv)91
return totalPage; |s, Add:S
} {:ZsUnzm
FSA"U9 w<
/** aJSBG|IC
* @param totalPage 9
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* The totalPage to set. K%3{a=1
*/ 'I5~<"E
publicvoid setTotalPage(int totalPage){ baz~luM
this.totalPage = totalPage; /tu\q
} {]3Rk
~s-"u
*>
} IpKpj"eoLy
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+|6 u
0&R^
xL\R-H^c]
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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 D0
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2F|06E'
个PageUtil,负责对Page对象进行构造: q#*b4q
{
java代码: ,xuA%CF-S
epQdj=h
'<% ;Nv
/*Created on 2005-4-14*/ T}y@ a^#
package org.flyware.util.page; {O (@}
s#%P9A
import org.apache.commons.logging.Log; S%2q X"8
import org.apache.commons.logging.LogFactory; <S(`e/#[
7(]M`bBH
/** H@V+Q}
* @author Joa oh.8WlI
* #6F/:j;
*/ Qcs>BOV~
publicclass PageUtil { *S] K@g
7N}==T89[
privatestaticfinal Log logger = LogFactory.getLog faPgp
IT0 [;eqR
(PageUtil.class); \4"01:u'
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/** +w9X$<?_
* Use the origin page to create a new page %tT=q^%5
* @param page mFW/xZwR,5
* @param totalRecords ?b3({P
* @return 7f#r&~=
*/ al{}p
publicstatic Page createPage(Page page, int K4j2xSGeo
DY?;Z98P?
totalRecords){ Q4QF_um
return createPage(page.getEveryPage(), 4A\>O?\
FiW>kTM8
page.getCurrentPage(), totalRecords); ))eQZ3ap9
}
:JfT&YYi"
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/** _p,1m[&M
* the basic page utils not including exception Oj0,Urs7
m1,yf*U
handler T;Zv^:]0
* @param everyPage )&wJ