Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 /Zx8nx'{V
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 o$\tHzB9!A
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 uOFnCy 4
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 *`1bc'umM;
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。 niQcvnT4b
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分页支持类: /.2 qWQH
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java代码: ssT@<Tk^4
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package com.javaeye.common.util; T g{UK
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import java.util.List; c>rKgx
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publicclass PaginationSupport { Vpw[B.v
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publicfinalstaticint PAGESIZE = 30; -)6;0
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privateint pageSize = PAGESIZE; hMWo\qM
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privateList items; 7dHIW!OA
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privateint totalCount; .v\PilF
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privateint[] indexes = newint[0]; I8Kb{[?q
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privateint startIndex = 0; m\ ?\6Wk
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public PaginationSupport(List items, int 4]IKh,jT
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totalCount){ BtID;^Dz
setPageSize(PAGESIZE); M2L0c?
setTotalCount(totalCount); `yx56
setItems(items); {?y<%@
setStartIndex(0); )gjGG8Ee
} 4gya]
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public PaginationSupport(List items, int IW mHp]
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totalCount, int startIndex){ q#|r
setPageSize(PAGESIZE); @'Q%Jc(
setTotalCount(totalCount); E^82==R
setItems(items); j=\Mx6os
setStartIndex(startIndex); 58PKx5`D
} _)q4I(s*
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public PaginationSupport(List items, int V>r j$Nc]
5)8.
totalCount, int pageSize, int startIndex){ 0NrTJ R`
setPageSize(pageSize); ho_4fDv
setTotalCount(totalCount); smbUu/
setItems(items); k0knPDbHv
setStartIndex(startIndex); (qbc;gBy
} UC(9Dz
*.xZfi_|
publicList getItems(){ ij!*CTG
return items; 7G2vYKC'
} t+J)dr
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publicvoid setItems(List items){ \wFhTJY
this.items = items; C-r."L
} K]9tc)
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publicint getPageSize(){ }.OxJ=M
return pageSize; h>.9RX &
} o:4CI
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publicvoid setPageSize(int pageSize){ wCC-Y kA
this.pageSize = pageSize; 7Y)s#FJ
} y6\ [1nZ
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publicint getTotalCount(){ jKYm /}d
return totalCount; BjN{@aEO
} 6Z$b?A3zM
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publicvoid setTotalCount(int totalCount){ rrYp'L
if(totalCount > 0){ Iht@mE
this.totalCount = totalCount; FGDw;lEa9[
int count = totalCount / BJ"Ay@D*
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pageSize; ~yd%~|
if(totalCount % pageSize > 0) W;91H'`?H
count++; ynx WQ%d(`
indexes = newint[count]; ?$2q P`-
for(int i = 0; i < count; i++){ I>\}}!
indexes = pageSize * V!\n3i?i
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i; {Qm6?H
} ?F9hDLX
}else{ rpx0|{m
this.totalCount = 0; =[ APMig,n
} 'aNahzb
} ]S*E
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publicint[] getIndexes(){ [9w, WJL
return indexes; zo/0b/lQ
} ocq2
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publicvoid setIndexes(int[] indexes){ Y7*'QKz2
this.indexes = indexes; 9&&kgKKGQ
} m)(SG
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publicint getStartIndex(){ 'T6B_9GQ8
return startIndex; Feh"!k <6k
} </8be=e7p
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publicvoid setStartIndex(int startIndex){ ,o4r,.3[s
if(totalCount <= 0) S$Qr@5
this.startIndex = 0; 4RlnnXY
elseif(startIndex >= totalCount) _, 11EeW@
this.startIndex = indexes 3zk:59
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[indexes.length - 1]; [8xeQKp4
elseif(startIndex < 0) c9
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this.startIndex = 0; W<Bxm|
else{ 0c%@e2(N
this.startIndex = indexes aB/{ %%o
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[startIndex / pageSize]; ;G iI'M
} nLzX
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} V+P8P7y37B
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publicint getNextIndex(){ *7)S%r,?
int nextIndex = getStartIndex() + .LWOM8)
8}ii3P y
pageSize; p)K9ZI
if(nextIndex >= totalCount) D!81(}p
return getStartIndex(); v$qpcu#o
else bM*Pcxv
return nextIndex; AM1/\R
} }G"r3*
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publicint getPreviousIndex(){ Xi 1q]ps
int previousIndex = getStartIndex() - 50}.Xm@,BO
bjU 2UcI"<
pageSize; Z5"!0B^ j
if(previousIndex < 0) a*pXrp@
return0; !"Z."fm*
else MoC*tImWR
return previousIndex; >u'/$k
} >#Grf)@"6
azz#@f1
} 5<'n
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抽象业务类 o06A=4I
java代码: 'vqj5YTj
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/** @5<]W+jk4
* Created on 2005-7-12 e'}ePvN
*/ l5":[C$
package com.javaeye.common.business; J)#59a
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import java.io.Serializable; U*`
import java.util.List; *K0j5dx
*DPTkMQN
import org.hibernate.Criteria; zLJ:U`uh\
import org.hibernate.HibernateException; I@y2HxM
import org.hibernate.Session; ~;!i)[-
import org.hibernate.criterion.DetachedCriteria; ="'rH.n #
import org.hibernate.criterion.Projections; $9j>VGf=
import n1k$)S$iiy
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org.springframework.orm.hibernate3.HibernateCallback; a#OhWqu$
import Vq)|gF[6i
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org.springframework.orm.hibernate3.support.HibernateDaoS z=- 8iks|
[[.&,6
upport; -KJ}.q>upq
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import com.javaeye.common.util.PaginationSupport; ~/]\iOL
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public abstract class AbstractManager extends ;%b <uV
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HibernateDaoSupport { Y]`lEq%
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privateboolean cacheQueries = false; sqMNon`5
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privateString queryCacheRegion; g:uaI
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publicvoid setCacheQueries(boolean \$$b",2
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cacheQueries){ Le#E! sU
this.cacheQueries = cacheQueries; vV&AG1_Mv
} TQbFI;\
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publicvoid setQueryCacheRegion(String 2yCd:wg
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queryCacheRegion){ J1u@A$4l?
this.queryCacheRegion = f)ucC$1=
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queryCacheRegion; Y9I #Q
} 1o5Y9#7
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publicvoid save(finalObject entity){ sg9x?Bx9
getHibernateTemplate().save(entity); 21)-:rS
} ^8f|clw"
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publicvoid persist(finalObject entity){ B'lxlYV1
getHibernateTemplate().save(entity); [M8qU$&?]
} t3yQ/
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publicvoid update(finalObject entity){ E=tx.h4xG~
getHibernateTemplate().update(entity); \3js}
} \4`saM /x
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publicvoid delete(finalObject entity){ J!TK*\a2
getHibernateTemplate().delete(entity); B3g82dm
} {TxVRpiP{Z
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publicObject load(finalClass entity, JK'_P}[]I
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)
finalSerializable id){ tr9_bl&z
return getHibernateTemplate().load '@}?NV0
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(entity, id);
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} 3Av(|<cR
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publicObject get(finalClass entity, @y~BYiKs
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finalSerializable id){ >Wr
return getHibernateTemplate().get :v
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(entity, id); l)!woOt
} ^hYR5SX
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publicList findAll(finalClass entity){ 65e
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return getHibernateTemplate().find("from ;P0Y6v3
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" + entity.getName()); Zy+QA>d|
} g ]PLW3
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publicList findByNamedQuery(finalString $X<<JnsK
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namedQuery){ ~|B!.+
return getHibernateTemplate S1^Mw;?P
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().findByNamedQuery(namedQuery); NE>JtTF<
} {'K;aJ'\
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publicList findByNamedQuery(finalString query, w2C!>fJ]1
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finalObject parameter){ /CQQ^/
return getHibernateTemplate @2Y]p.$q
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().findByNamedQuery(query, parameter); 9{^B
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} .Zo9^0`C
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publicList findByNamedQuery(finalString query, a ~iEps
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finalObject[] parameters){ Kg0\Pvg8?T
return getHibernateTemplate [m+O0VK$
d(B;vL@R2V
().findByNamedQuery(query, parameters); \z2hXT@D
} ~JmxW;|_x)
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publicList find(finalString query){ 'JKvy(n>
return getHibernateTemplate().find u1|Y;*
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(query); CbvL X="%
} BaHgc 4zI
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publicList find(finalString query, finalObject y7G|P~td
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parameter){ 5J2p^$s
return getHibernateTemplate().find \iLd6Qo_aq
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(query, parameter); HE<%d
} $Qc%9p
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public PaginationSupport findPageByCriteria XxU}|jTO#
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(final DetachedCriteria detachedCriteria){ *CD=cmdD*
return findPageByCriteria h|>n3-k|p
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); H&Lbdu~E
} W:( Usy
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public PaginationSupport findPageByCriteria p{#7\+}
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}
(final DetachedCriteria detachedCriteria, finalint ?*5l}y=
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startIndex){ XV9'[V
return findPageByCriteria }sNZQ89V*v
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(detachedCriteria, PaginationSupport.PAGESIZE, X1~A "sW[
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startIndex); uRcuy/CY
} 7Qztc?XK
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public PaginationSupport findPageByCriteria "'dC>7* <
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(final DetachedCriteria detachedCriteria, finalint qpH-P8V
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pageSize, bL#TR;*]
finalint startIndex){ fOfz^W
return(PaginationSupport) Fi=8B&j
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getHibernateTemplate().execute(new HibernateCallback(){ MZF ;k$R
publicObject doInHibernate &T.P7nJ=
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(Session session)throws HibernateException { /PuWJPy;
Criteria criteria = L ]'CA^N
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detachedCriteria.getExecutableCriteria(session); aRKG)0=
int totalCount = _4#psxl[M
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((Integer) criteria.setProjection(Projections.rowCount !7kOw65+0
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()).uniqueResult()).intValue(); Y##P9^zH1
criteria.setProjection b#'a4j-u
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(null); I:7,CV
List items = -~aEqj#?
juZ3""
criteria.setFirstResult(startIndex).setMaxResults _NN{Wk/3w
P@![P Ij
(pageSize).list(); ]h8V{%H
PaginationSupport ps =
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new PaginationSupport(items, totalCount, pageSize, ! \Kh\
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startIndex); Hx0,kOh)
return ps; 4T^WRS
} R63d
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}, true); nvs7s0@Fqe
} a5S/
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public List findAllByCriteria(final fYPU'"hzG
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DetachedCriteria detachedCriteria){ ?m^7O_1
return(List) getHibernateTemplate p=T\3_q
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().execute(new HibernateCallback(){ 6>A8#VT
publicObject doInHibernate }
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ar}759
(Session session)throws HibernateException { -"L6^IH7
Criteria criteria = &y?B&4|hM
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detachedCriteria.getExecutableCriteria(session); ~PAn
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return criteria.list(); A84HaRlkF5
} aN3{\^
}, true); {q4"x5|
} &zy9} 4w,
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public int getCountByCriteria(final 6&T1
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DetachedCriteria detachedCriteria){ #| Po&yu4R
Integer count = (Integer) +rX,Sl`/
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getHibernateTemplate().execute(new HibernateCallback(){ U.x.gZRo[
publicObject doInHibernate l<6/ADuS
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(Session session)throws HibernateException { |Ay#0uQ5Y
Criteria criteria = [J3;U6
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detachedCriteria.getExecutableCriteria(session); ?xs0J
return !*-cf$
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criteria.setProjection(Projections.rowCount bhYaG i0
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()).uniqueResult(); =)bc/309
} :b-(@a7>
}, true); OR{"9)I
return count.intValue(); M
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} `lzH:B
} `,"Jc<R7Z
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用户在web层构造查询条件detachedCriteria,和可选的 )]R8
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 39CPFgi<l*
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PaginationSupport的实例ps。 ~K`blW47
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ps.getItems()得到已分页好的结果集 V5MbWXgR
ps.getIndexes()得到分页索引的数组 Hua8/:![+
ps.getTotalCount()得到总结果数 h,g~J-x`|
ps.getStartIndex()当前分页索引 ZAwl,N){
ps.getNextIndex()下一页索引 w@We,FUJN
ps.getPreviousIndex()上一页索引 z_TK
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 tA.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 t!GY>u>`
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一下代码重构了。 O(!'V~3
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我把原本我的做法也提供出来供大家讨论吧: 3#unh`3b
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首先,为了实现分页查询,我封装了一个Page类: "mA/:8` Q
java代码: _QY "#
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/*Created on 2005-4-14*/ Q@R8qc=*
package org.flyware.util.page; (%1*<6ka
*:(t.iL
/** $fKWB5p|()
* @author Joa lk|/N^8M
* 4M}/PoJ
*/ <:w7^m
publicclass Page { zFIbCv8
(WC<X Kf
/** imply if the page has previous page */ M-_)CR
privateboolean hasPrePage; !=pemLvH
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/** imply if the page has next page */ ~7v^7;tT
privateboolean hasNextPage; whshjl?a
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/** the number of every page */ ~n?U{
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privateint everyPage; l:+1j{ d7
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/** the total page number */ _19k@a
privateint totalPage; A}8U;<\Ig
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/** the number of current page */ %?seX+ne
privateint currentPage; N~Gh>{N
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/** the begin index of the records by the current jp|wc,]!
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query */ K^+B"
privateint beginIndex; Q5ux**(Wr
(@ Bw@9
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/** The default constructor */ 7">.{
@S
public Page(){ Rp#SqRy`
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} QnqX/vnR
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/** construct the page by everyPage .*,ZcO
* @param everyPage _v\QuI6
* */ I('l)^m%
public Page(int everyPage){ ]TQjk{X<
this.everyPage = everyPage; LxbVRw
} F]&9Lp}
"
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/** The whole constructor */ C/XOI>
public Page(boolean hasPrePage, boolean hasNextPage, pT
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int everyPage, int totalPage, mEA w^
int currentPage, int beginIndex){ uQDu<@5^[
this.hasPrePage = hasPrePage; NJ~'`{3v
this.hasNextPage = hasNextPage; WJ%b9{<
this.everyPage = everyPage; R$\ieNb
this.totalPage = totalPage; ^m~=<4eX
this.currentPage = currentPage; C]k\GlhB
this.beginIndex = beginIndex; [4gv_g
} Gfvz%%>l
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/** 8w\&QX
* @return 4P.ry|2
* Returns the beginIndex. TS-[p d
*/ _&T$0SZco
publicint getBeginIndex(){ 2iUF%>
return beginIndex; @{bf]Oc
} F>&8b^v bn
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/** _*+M'3&=
* @param beginIndex yO !*pC
* The beginIndex to set. h0GXN\xI
*/ FIuKX"XR
publicvoid setBeginIndex(int beginIndex){ Gce![<|ph
this.beginIndex = beginIndex; ow&R~_
} vt1!|2{
h
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/** I;No++N0
* @return 3[c54S+(U
* Returns the currentPage. ^Tl|v'
*/ %T&kK2d;
publicint getCurrentPage(){ MT3UJ6 ~P
return currentPage; rC'97`!K
} qU}[(9~Ru
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/** wBr0s*1I
* @param currentPage Z$q}y
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* The currentPage to set. Ay{4R
*/ ]WS 7l@
publicvoid setCurrentPage(int currentPage){ {P*RA'H3G
this.currentPage = currentPage; u+ -}|
} a+Z/=YUR
Y,+$vj:y8
/** CzwnmSv{.
* @return H7uW|'XWz
* Returns the everyPage. +UB. M
*/ KjhOz%Yt[o
publicint getEveryPage(){ GhX>YzD7
return everyPage; T3bBc
} VH8,!# Q;
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/** Er{yQIi0L
* @param everyPage \KTX{qI"f
* The everyPage to set. oR5 'g7?
*/ FN G]
publicvoid setEveryPage(int everyPage){ um[.r,++
this.everyPage = everyPage; w|N LK
} 3t8VH`!mL{
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/** i`X/d=
* @return 1Ztoj}!I
* Returns the hasNextPage. .8k9yk
*/ O5E \#*<K
publicboolean getHasNextPage(){ u-8,9
return hasNextPage; tY VmB:l
} pJV<#<#Z
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/** emTqbO
* @param hasNextPage Qv#]T,
* The hasNextPage to set. 6z~6o0s~
*/ L9@nx7D
publicvoid setHasNextPage(boolean hasNextPage){ B
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this.hasNextPage = hasNextPage; ?xIwQd0
} aCQAh[T
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/** V4_ZBeWA
* @return 3~Ah8,
* Returns the hasPrePage. caS5>wk`R
*/ L,BuzU[1S
publicboolean getHasPrePage(){ dtJ?J<m}
return hasPrePage; {"-uaH>,
} 3b~k)t4R
X"*pt5B6`
/** $)6y:t"
* @param hasPrePage I_\j05
* The hasPrePage to set. ih~ R?W
*/ !?,rcgi
publicvoid setHasPrePage(boolean hasPrePage){ 2Lm.;l4YO
this.hasPrePage = hasPrePage; ca5Ir<mL
} L2+~I<|>
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/** i,ga2{GnM
* @return Returns the totalPage. Ub3^Js!b%
* IvO#tI
*/ Tw8$6KUW
publicint getTotalPage(){ g6MK~JG$?h
return totalPage; )ui]vS:>
}
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/** :hC+r=!I
* @param totalPage T:dV[3
* The totalPage to set. "|`euxYV
*/ (}
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publicvoid setTotalPage(int totalPage){ @!`x^Tzz
this.totalPage = totalPage; 4YMX;W
} /GRkQ",
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} E&9BeU
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VB o=*gn,$
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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 l]C#bL>i
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个PageUtil,负责对Page对象进行构造: ~qT5F)$B-
java代码: b"iPuN!p
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yH/m@#
/*Created on 2005-4-14*/ _TEjB:9eY
package org.flyware.util.page; 9Zw{MM]
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N;
import org.apache.commons.logging.Log; x}B3h9]
import org.apache.commons.logging.LogFactory; [7_1GSS1
hv
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/** 7Ji|x{``
* @author Joa \SKobO?qI
* @L0xU??"|
*/ ZOw%Fw4B
publicclass PageUtil { u0p[ltJ,
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privatestaticfinal Log logger = LogFactory.getLog _Oc5g5_{
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(PageUtil.class); mBN+c9n/
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