Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 x.\XUJ4x
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 G_+Ph^
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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 6|oWaA\gI
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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 045\i[l=
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。 !sG"n&uZq
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分页支持类: |[ocyUsxX
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java代码: u G[!w!e
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package com.javaeye.common.util; Cya5*U0=
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import java.util.List; Y}/c
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publicclass PaginationSupport { =)*JbwQ
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publicfinalstaticint PAGESIZE = 30; ]>vf 9]
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privateint pageSize = PAGESIZE; T<M?PlED
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privateList items; ?`aTu:1#Z
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privateint totalCount; oAnigu;
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privateint[] indexes = newint[0]; `Hd9\;NJ
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privateint startIndex = 0; iD`k"\>9
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public PaginationSupport(List items, int ]738Z/)^
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totalCount){ M5 `m.n<
setPageSize(PAGESIZE); ^]7,1dH}M
setTotalCount(totalCount); Qg> 0G%cXU
setItems(items); 4Cd#sQ
setStartIndex(0);
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} v~`*(Hh
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public PaginationSupport(List items, int zLK\I~rU!
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totalCount, int startIndex){ avy=0Jmj
setPageSize(PAGESIZE); #B}Qt5w
setTotalCount(totalCount); Jh^8xI,`C
setItems(items); [-]A^?yBM
setStartIndex(startIndex); WvbEh|y
} e{JVXc[D
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public PaginationSupport(List items, int ~$ *`cO
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totalCount, int pageSize, int startIndex){ RF!'K
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setPageSize(pageSize); ZYDWv/u
setTotalCount(totalCount); ]< +3Vw
setItems(items); 4(8<w cL
setStartIndex(startIndex); FW5}oD(H
} /W0E(8:C)
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publicList getItems(){ 9#fp_G;=
return items; n.I2$._(b
} ?$16A+
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publicvoid setItems(List items){ c"qPTjY
this.items = items; SXh?U,5u
} %Gu][_.L
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publicint getPageSize(){ on_H6Y@B52
return pageSize; +0dT^Jkqg
} .OV-`TNWj
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publicvoid setPageSize(int pageSize){ -~}
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this.pageSize = pageSize; D>Ua#<52q
} |mvM@V;^8{
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publicint getTotalCount(){ Uh%6LPg^
return totalCount; ]'e AO
} KD=bkZ&
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publicvoid setTotalCount(int totalCount){ N|$5/bV
if(totalCount > 0){ k{1b20
this.totalCount = totalCount; EP(Eq
int count = totalCount / CdNih8uG
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pageSize; I5Q~T5Ar
if(totalCount % pageSize > 0) 5v+L';wx[T
count++; 1xIFvXru
indexes = newint[count]; T$IUKR
for(int i = 0; i < count; i++){ ~ttKI4
indexes = pageSize * @C07k^j=U
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i; j)BQMtt&U
} xRB7lV*
}else{ ivD^HhG
this.totalCount = 0; $Ba`VGP>)3
} E^82==R
} "\<P$&`HA
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publicint[] getIndexes(){ {IrJLlq
return indexes; 7~D`b1||
} 4/f[`].#W
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publicvoid setIndexes(int[] indexes){ ?l>e75V%w
this.indexes = indexes; Y!aLf[x]
} wM0E%6
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publicint getStartIndex(){ u
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return startIndex; Q~b_dx{m
} 4Lw'v: (
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publicvoid setStartIndex(int startIndex){
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if(totalCount <= 0) w~n kNqm
this.startIndex = 0; OSj%1KL
elseif(startIndex >= totalCount) m3B\)2B
this.startIndex = indexes {RH*8?7
' Nw6.5
[indexes.length - 1]; |w4(rs-
elseif(startIndex < 0) ,;c{9H
this.startIndex = 0; 4[Z1r~t\L
else{ E::<;9
this.startIndex = indexes 4V1|jy3
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[startIndex / pageSize]; uZ-`fcCjD
} dhs#D:/{9
} \DaLHC~
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publicint getNextIndex(){ \3M1.Q4$Gr
int nextIndex = getStartIndex() + EL"4E',
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pageSize; !}y8S'Yjw
if(nextIndex >= totalCount) 98=XG1sQ@
return getStartIndex(); 5"[yFmP*
else Iht@mE
return nextIndex; FGDw;lEa9[
} BJ"Ay@D*
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publicint getPreviousIndex(){ 9wzg{4/-$
int previousIndex = getStartIndex() - wqf& i^_
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pageSize; FRc |D
if(previousIndex < 0) y.
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return0; > e;]mU`,
else +B](5 z4
return previousIndex; "\}21B~{7'
} jzQ9zy_
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} cK/PQsMP
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抽象业务类 9*f2b.Aj
java代码: L,GShl 0S
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/** j\nE8WH
* Created on 2005-7-12 Pb*q;9
*/ s8{-c^G:R
package com.javaeye.common.business; UP5%C;
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import java.io.Serializable; /E;;j9
import java.util.List; IruyE(;HS
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import org.hibernate.Criteria; :~-)Sm+^
import org.hibernate.HibernateException; VyRW '
import org.hibernate.Session; dE+CIjW5
import org.hibernate.criterion.DetachedCriteria; )`e^F9L
import org.hibernate.criterion.Projections; -,[~~
import 3zk:59
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org.springframework.orm.hibernate3.HibernateCallback; [8xeQKp4
import PXOq#
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org.springframework.orm.hibernate3.support.HibernateDaoS {K< ~
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upport; \,$r,6-g
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import com.javaeye.common.util.PaginationSupport; R (t!xf
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public abstract class AbstractManager extends b/T20F{W\o
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HibernateDaoSupport { cw*(L5bu
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privateboolean cacheQueries = false; cr2{sGn|
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privateString queryCacheRegion; _G_ &Me0
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publicvoid setCacheQueries(boolean fQ2!sV
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cacheQueries){ ;a#}fX
this.cacheQueries = cacheQueries; Sn_z
} wjN`EF5$}&
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publicvoid setQueryCacheRegion(String 6RR4L^(m
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queryCacheRegion){ 1\M"`L/
this.queryCacheRegion = =d:R/Z%,
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queryCacheRegion; =U)n`#6_j2
} IwZZewb-a
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publicvoid save(finalObject entity){ azz#@f1
getHibernateTemplate().save(entity); 5<'n
} 4SX3c:>
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publicvoid persist(finalObject entity){ KIXwx98
getHibernateTemplate().save(entity); o06A=4I
} }rFsU\]:q
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publicvoid update(finalObject entity){ ?,A}E|jZ
getHibernateTemplate().update(entity); kKFuTem_3
} D5o+0R
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publicvoid delete(finalObject entity){ X}n&`y{/
getHibernateTemplate().delete(entity); n"K {uj))
} ;'b!7sMO~
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publicObject load(finalClass entity, b/a?\0^
6E)uu; 8
finalSerializable id){ hY4)W
return getHibernateTemplate().load 1t~S3Q||>]
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(entity, id); "@UU[o
} (ffOu#RQ3
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publicObject get(finalClass entity, ~Q.8 U3"
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finalSerializable id){ ,}xpYq_/
return getHibernateTemplate().get Vq)|gF[6i
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(entity, id); te! ]9rR
} c0,gfY%sI$
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publicList findAll(finalClass entity){ P?WT)C2)u
return getHibernateTemplate().find("from $=@9 D,R
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" + entity.getName()); C+Fh$
} `uaD.m$EJ
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publicList findByNamedQuery(finalString N9>'/jgZX
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namedQuery){ 0pZ.; /<{
return getHibernateTemplate FrAqTz
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().findByNamedQuery(namedQuery); + !E{L
} ~#N.!e4
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publicList findByNamedQuery(finalString query, &t9XK 8S
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finalObject parameter){ sJjl)Qs)T
return getHibernateTemplate /pSUn"3
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().findByNamedQuery(query, parameter); "0!eb3n
} 0Tn|Q9R
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publicList findByNamedQuery(finalString query, Hc_hO
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finalObject[] parameters){ m_PrasZ>
return getHibernateTemplate tc49Ty9$[
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().findByNamedQuery(query, parameters); @88z{
} -Uhl9
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publicList find(finalString query){ 3 DO$^JJ.
return getHibernateTemplate().find 2A18hP`^
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(query); kgbr+Yw2X
} G,mH!lSm,
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publicList find(finalString query, finalObject e$xv[9
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parameter){ <>5:u
return getHibernateTemplate().find CrwcYzrRWl
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(query, parameter); p*W ZY=Q
} xjn8)C
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public PaginationSupport findPageByCriteria Q\/":ISq1
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(final DetachedCriteria detachedCriteria){ *l'$pJ X
return findPageByCriteria $et
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Cak/#1
} C&s }m0R
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public PaginationSupport findPageByCriteria :]z-Rz
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(final DetachedCriteria detachedCriteria, finalint .V )2Tz
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startIndex){ OTtanJ?
return findPageByCriteria YI\Cs=T/
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(detachedCriteria, PaginationSupport.PAGESIZE, 5P t}
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startIndex); :7PSZc:xE
} XL&eJ
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public PaginationSupport findPageByCriteria +Tc(z{;
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(final DetachedCriteria detachedCriteria, finalint {msB+n~WZ
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pageSize,
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finalint startIndex){ WSB|-Qj}W
return(PaginationSupport) M(]|}%
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getHibernateTemplate().execute(new HibernateCallback(){ u1|Y;*
publicObject doInHibernate bHH}x"d[x
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(Session session)throws HibernateException { Q,qylL
Criteria criteria = O/r<VTOp
4.kkxQR7r
detachedCriteria.getExecutableCriteria(session); Y;5^w=V
int totalCount = JA(q>>4
+?m=f}>W1
((Integer) criteria.setProjection(Projections.rowCount 5J2p^$s
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()).uniqueResult()).intValue(); `kT$Gx4x
criteria.setProjection WxP4{T* <
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(null); >_%g8T'
List items = P9cI{RI
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criteria.setFirstResult(startIndex).setMaxResults 0c;"bA0>Sx
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(pageSize).list(); DmpJzHj|
PaginationSupport ps = 1Y0oo jD
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new PaginationSupport(items, totalCount, pageSize, V@xnz)^t
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startIndex); F^v{ Jqc
return ps; eOmxA<h
} ; 8x^9Q
}, true); #7:9XID /
} D)eKq!_
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public List findAllByCriteria(final 2{tJ'3
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DetachedCriteria detachedCriteria){ dz.MH
return(List) getHibernateTemplate 9-<V%eNX
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().execute(new HibernateCallback(){ rTiuQdvo
publicObject doInHibernate bL#TR;*]
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(Session session)throws HibernateException { Fi=8B&j
Criteria criteria = }z2-|"H
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detachedCriteria.getExecutableCriteria(session); V1V4 <Zj
return criteria.list(); w [x+2
} Z]+Xh
}, true); tKViM@T
} ;+Kewi;<
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public int getCountByCriteria(final v%e"4:K}?
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<{
DetachedCriteria detachedCriteria){ (Q}ijwj
Integer count = (Integer) BPs
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getHibernateTemplate().execute(new HibernateCallback(){ Y##P9^zH1
publicObject doInHibernate b#'a4j-u
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(Session session)throws HibernateException { sbhEZ#7#
Criteria criteria = ^/YAokj
6Z}))*3 9
detachedCriteria.getExecutableCriteria(session); QlXF:Gx"=
return
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criteria.setProjection(Projections.rowCount i-W2!;G
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()).uniqueResult(); '0]_8Sy&
} !|QeYGnq6
}, true); @Oay$gP{T
return count.intValue(); C&"2`ll
} 7ZnQ] ?
} kpUU'7Q
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用户在web层构造查询条件detachedCriteria,和可选的 ^%@.Vvz<
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 gJv^v`X
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PaginationSupport的实例ps。 pLcng[
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ps.getItems()得到已分页好的结果集 #-,`4x$m|
ps.getIndexes()得到分页索引的数组 GlZDuU
ps.getTotalCount()得到总结果数 Kf5 p*AI
ps.getStartIndex()当前分页索引 _kLoDju%
ps.getNextIndex()下一页索引 C#0Wo
ps.getPreviousIndex()上一页索引 ]<= t
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 bV,R*C
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 W=w@SO_?wp
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一下代码重构了。 L
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我把原本我的做法也提供出来供大家讨论吧: XITQB|C??$
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首先,为了实现分页查询,我封装了一个Page类: 9]\vw
java代码: n|6yz[N
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/*Created on 2005-4-14*/ jm"xf7
package org.flyware.util.page; pn|{P<b\
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/** HOG7|| &y
* @author Joa Kwnu|8
* ;0E4S
*/ p,fin?nW c
publicclass Page { =;T[2:JUu
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/** imply if the page has previous page */ 2S/ 7f:
privateboolean hasPrePage; ZC-N4ESr
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/** imply if the page has next page */ z{x -Vfd
privateboolean hasNextPage; v~3q4P
NKrk*I"G
/** the number of every page */ &aOOG8l
privateint everyPage; Y$^QH.h
q?\D9aT9
/** the total page number */ HC+R:Dz
privateint totalPage; 10^=1@U
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/** the number of current page */ 2F(j=uV+
privateint currentPage; v/dcb%
*<1m
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/** the begin index of the records by the current UHWunI S
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query */ =t2epIr5
privateint beginIndex; NKws;/u
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/** The default constructor */ /_8V+@im
public Page(){ G39t'^ZK*#
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} 8iRQPV-"_
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/** construct the page by everyPage Tj:F Qnx
* @param everyPage vvC GzOv
* */ B7;MY6h#
public Page(int everyPage){ " B1' K8
this.everyPage = everyPage; [cq>QMW
} W2^R$"U
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/** The whole constructor */ \b->AXe8
public Page(boolean hasPrePage, boolean hasNextPage, Y/gCtSF
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int everyPage, int totalPage, zFIbCv8
int currentPage, int beginIndex){ (WC<X Kf
this.hasPrePage = hasPrePage; M-_)CR
this.hasNextPage = hasNextPage; sr4K-|@
this.everyPage = everyPage; ORNE>6J
H
this.totalPage = totalPage; y- YYDEl
this.currentPage = currentPage; whshjl?a
this.beginIndex = beginIndex; 2Xosj(H
} Rk<:m+V=
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/** l:+1j{ d7
* @return Up:#Zs2
* Returns the beginIndex. ]@EjKgs
*/ U,N4+F}FR
publicint getBeginIndex(){ [}D)73h`
return beginIndex; eYFCf;
} &oBJY'1
r\zK>GVm_
/** EifYK
* @param beginIndex jp|wc,]!
* The beginIndex to set. ^H'#*b0u
*/ 'CvZiW[_r
publicvoid setBeginIndex(int beginIndex){ {ib`mC^
this.beginIndex = beginIndex; _B2t|uQ
} Wo&i)S<i0F
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/** Rp#SqRy`
* @return =g ]C9'I3
* Returns the currentPage. =S,^"D\Z:
*/ |zf||ju
publicint getCurrentPage(){ Z6I!4K
return currentPage; H={,zZ11{
} r?$\`,;
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/** +x1sV *S
* @param currentPage kDrGl{U}
* The currentPage to set. < mxUgU
*/ Ur@3_F
publicvoid setCurrentPage(int currentPage){ =o {`vv
this.currentPage = currentPage; G} p~VLf
} u^uW<.#z
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/** x/ez=yd*l
* @return xucV$[f
* Returns the everyPage. 5HB4B <2
*/ `JC!uc
publicint getEveryPage(){ OA8pao~H
return everyPage; $ 8s&=OW
} oq|K:<l
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/** *oF{ R^
* @param everyPage V1+IqOXAIp
* The everyPage to set. 9wYbY* j
*/ _T1e##Sq,
publicvoid setEveryPage(int everyPage){ y
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this.everyPage = everyPage; :sf;Fq
} ixp %aRRP
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/** ]b[3 th*
* @return }.Ug`7%G
* Returns the hasNextPage. %V$^CWOy
*/ hX^XtIC=
publicboolean getHasNextPage(){ W uQdz&s>
return hasNextPage; 54k
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} >+1bTt/-F
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/** x@/!H<y
* @param hasNextPage 5\pizD/17
* The hasNextPage to set. tIg_cY_y
*/ 3TJNlS
publicvoid setHasNextPage(boolean hasNextPage){ ^t| %!r
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this.hasNextPage = hasNextPage; $h2h&6mH
} !({[^[!
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/** aW"BN 5eM>
* @return F/&&VSv>LO
* Returns the hasPrePage. I?1^\s#L
*/ % $J^dF_0
publicboolean getHasPrePage(){ \d6A<(!=v
return hasPrePage; {BF$N#7
} Dd*C?6
x[_+U4-/
/** Ft07>E$/Q^
* @param hasPrePage 0g1uM:;
* The hasPrePage to set. C 9DRVkjj
*/ CkOd>Kn
publicvoid setHasPrePage(boolean hasPrePage){ f#!Ljjf$;
this.hasPrePage = hasPrePage; 8r~4iVwg
} rtPQ:CaA)?
wy7f7zIa
/** v
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* @return Returns the totalPage. a{y;Ub
* P:Bg()
*/ /u?^s "C/
publicint getTotalPage(){ n|8fdiK#}
return totalPage; /m%;wH|6%
} +Ix;~
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/** FN G]
* @param totalPage qLcs)&}/A
* The totalPage to set. d!>PqPo
*/ lLnD%*03
publicvoid setTotalPage(int totalPage){ i`X/d=
this.totalPage = totalPage; 1Ztoj}!I
} .8k9yk
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} %kF6y_h`
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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 /CH*5w)1
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个PageUtil,负责对Page对象进行构造: BeBa4s
java代码: *S7<QyVh
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/*Created on 2005-4-14*/ "I
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package org.flyware.util.page; -_B*~M/vV`
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import org.apache.commons.logging.Log; <"6}C)G
import org.apache.commons.logging.LogFactory; caS5>wk`R
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/** U4Il1|
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* @author Joa 8^kw
* dtJ?J<m}
*/ {"-uaH>,
publicclass PageUtil { 3b~k)t4R
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privatestaticfinal Log logger = LogFactory.getLog uq'T:d
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(PageUtil.class); ?m0|>[j
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/** b0t/~]9G
* Use the origin page to create a new page sZ_+6+ :
* @param page Ubv<3syR'
* @param totalRecords |pA3ZWm
* @return z]K:Amp;Z
*/ |BN^5mqP6
publicstatic Page createPage(Page page, int p4[cPt ~C
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totalRecords){ 2{(_{9<>z
return createPage(page.getEveryPage(), ]U82A**n
wMr*D['" #
page.getCurrentPage(), totalRecords); ve<D[jQsk
} rjz$~(&m6
}Dp/K4
/** |<gYzbq
* the basic page utils not including exception 741Sd8
*6<<6f`(
handler ,Tjc\;~%
* @param everyPage WTbq)D(&[_
* @param currentPage E&9BeU
a#
* @param totalRecords g{RVxGE7
* @return page q-}qrg
*/ 4J{6Wt";
publicstatic Page createPage(int everyPage, int $9bLD
>.
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currentPage, int totalRecords){ >8PGyc*9
everyPage = getEveryPage(everyPage); vq=nG]cE)
currentPage = getCurrentPage(currentPage); EZypqe):/C
int beginIndex = getBeginIndex(everyPage, +8h!@
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currentPage); 9Zw{MM]
int totalPage = getTotalPage(everyPage, ](-zt9,
N;
x}B3h9]
totalRecords); [7_1GSS1
boolean hasNextPage = hasNextPage(currentPage, hv
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7Ji|x{``
totalPage); Y`3V&8X
boolean hasPrePage = hasPrePage(currentPage); 8#L
V
oR
vY)5<z&
returnnew Page(hasPrePage, hasNextPage, *3
8
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everyPage, totalPage, *MC+i$
currentPage, qjDt6B^RO
KDxqz$14-
beginIndex); -c4g;;%
} mBN+c9n/
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