Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 G@9u:\[l
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 #;`Oj
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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 C`)_i3
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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 fb23J|"
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分页支持类: [cDbaq,T
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java代码: ZP-dW|<[x
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package com.javaeye.common.util; lK*jhW?3:
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import java.util.List; <|a=hHPi:
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publicclass PaginationSupport { EJ`Q8uz
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publicfinalstaticint PAGESIZE = 30; E4r.ky`#~
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privateint pageSize = PAGESIZE; b
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privateList items; :s"2Da3B
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privateint totalCount; fp{G|.SA
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privateint[] indexes = newint[0]; za T_d/?J
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privateint startIndex = 0; ><=rIhG%H@
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public PaginationSupport(List items, int 3htq[Ren
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totalCount){ b,Ke>.m
setPageSize(PAGESIZE); }~F~hf>s
setTotalCount(totalCount); MGQ,\55"
setItems(items); +< yhcSSTB
setStartIndex(0); Wwhgo.Wx
} Q4?EZ_O
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public PaginationSupport(List items, int Q.A \U>AgV
0 _A23.Y
totalCount, int startIndex){ hU"F;4p
setPageSize(PAGESIZE); o\4CoeG
setTotalCount(totalCount); BxdX WO
setItems(items); ?ok)>P
setStartIndex(startIndex); eLV.qLBUs
} #dxvz^2V.3
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public PaginationSupport(List items, int fagM7)x
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totalCount, int pageSize, int startIndex){ 90fs:.
setPageSize(pageSize); >F[GVmC
setTotalCount(totalCount); KQ{Lt?S
setItems(items); <
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setStartIndex(startIndex); 2n)gpLIJ
} v L}T~_=3
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publicList getItems(){ u1^\MVO8
return items; ]JdJe6`Mc
} ,?(ciO)
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publicvoid setItems(List items){ Jf_%<\ O
this.items = items; <bUXC@3W
} @?Zf-.
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publicint getPageSize(){ j (ygQ4T
return pageSize; b7Oj<!Wo`
} "|t!7hC
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publicvoid setPageSize(int pageSize){ SkHYXe"]
this.pageSize = pageSize; : @6mFTV
} Vb!O8xV4;+
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publicint getTotalCount(){ R0wf#%97
return totalCount; aQUGNa0+d
} {DwIjy31T
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publicvoid setTotalCount(int totalCount){ VEs5;]#<2D
if(totalCount > 0){ G\=_e8(
this.totalCount = totalCount; Kkv<"^H
int count = totalCount / H)>sTST(
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pageSize; W~ruN4q.
if(totalCount % pageSize > 0) 4h8*mMghs
count++; bL`eiol6
indexes = newint[count]; ? ?[g}>
for(int i = 0; i < count; i++){ 1nI^-aQ3
indexes = pageSize * 3^wC<ZXcD
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i; |^( M{
} ,T|x)"uA`
}else{ U~H?4Izl=
this.totalCount = 0; cWa)#:JOV
} ;>>C)c4V "
} 9v?l
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publicint[] getIndexes(){ Ew$I\j*
return indexes; mgQIhXH5L
} vzXag*0
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publicvoid setIndexes(int[] indexes){ {(tHk_q
this.indexes = indexes; Ri)uq\E/#
} pC(sS0J
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publicint getStartIndex(){ ~OypE4./1
return startIndex; >jTp6tu,
} <9eu1^g
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publicvoid setStartIndex(int startIndex){ :]WqfR)#
if(totalCount <= 0) Zu/<NC
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this.startIndex = 0; +Qj(B@i
elseif(startIndex >= totalCount) F)Oe9x\/
this.startIndex = indexes [6tSYUZs
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[indexes.length - 1]; :P+\p=
elseif(startIndex < 0) :a0zT#u
this.startIndex = 0; [L(hG a
else{ 7%;_kFRV
this.startIndex = indexes p2%
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[startIndex / pageSize]; [[+ pMI
} +TJEG?o
} igC_)C^i>
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publicint getNextIndex(){ k)7{Y9_No
int nextIndex = getStartIndex() + 6b=q-0yj
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pageSize; =,V|OfW
if(nextIndex >= totalCount) v=?2S
return getStartIndex(); s?C&s|'.
else @xAfZb2 E
return nextIndex; Z`Z5sj 4{
} -{jdn%Y7CK
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publicint getPreviousIndex(){ Jxl6a:
int previousIndex = getStartIndex() - 7cTk@Gq
q3P+9/6
pageSize;
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if(previousIndex < 0) &
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return0; `[fxyg:u
else .uz|/Zy
return previousIndex; vbG]mMJ
} BS1Ap
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} ('[TLHP
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抽象业务类 v|';!p|
java代码: qxOi>v0\H
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/** j2 %^qL
* Created on 2005-7-12 \cJa;WM>
*/ PkuTg";
package com.javaeye.common.business; EHf\L
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import java.io.Serializable; ??&<k
import java.util.List; rNDrp@A>
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import org.hibernate.Criteria; 9&]M**X
import org.hibernate.HibernateException; \wvg,j=
import org.hibernate.Session; ca<"
import org.hibernate.criterion.DetachedCriteria; /e@H^Cgo
import org.hibernate.criterion.Projections; 4Y \wnwI
import <n"C,
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org.springframework.orm.hibernate3.HibernateCallback; \;X+X,M
import 5\fCd|
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org.springframework.orm.hibernate3.support.HibernateDaoS K4ZolWbU
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upport; <@v]H@E
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import com.javaeye.common.util.PaginationSupport; C#0Qd%
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public abstract class AbstractManager extends *Mc7f ?H
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HibernateDaoSupport { \*t~==WB
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privateboolean cacheQueries = false; {-/^QX]6
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privateString queryCacheRegion; NQHz<3S[
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publicvoid setCacheQueries(boolean Z~
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cacheQueries){ !U%T&?E l
this.cacheQueries = cacheQueries; >w6taX
} fh8j2S9J
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publicvoid setQueryCacheRegion(String ,MPB/j^o5!
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queryCacheRegion){ #]WqM1u
this.queryCacheRegion = DL^o_61
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queryCacheRegion; HeGYu?&
} 6?tlU>A2s
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publicvoid save(finalObject entity){ l\0w;:N3
getHibernateTemplate().save(entity); n"Veem[_4g
} !%(h2]MQ
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publicvoid persist(finalObject entity){ SMr13%KN/
getHibernateTemplate().save(entity); n{0Ld -zH
} qFX~[h8i+
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publicvoid update(finalObject entity){ PXoz*)tk
getHibernateTemplate().update(entity); ?4H#G)F
} Z6C=T;w
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publicvoid delete(finalObject entity){ #65^w=Sp}
getHibernateTemplate().delete(entity); ?
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} /wShUR{
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publicObject load(finalClass entity, WUc#)EEM)
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finalSerializable id){ Rgy-OA
return getHibernateTemplate().load f>o,N{|
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(entity, id); [jdFA<Is
} INs!Ame2
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publicObject get(finalClass entity, %VJ85^B3
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finalSerializable id){ 6d[_G$'nk
return getHibernateTemplate().get f"u*D,/sS
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(entity, id); >I
} 3f Xv4R;!:
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publicList findAll(finalClass entity){
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return getHibernateTemplate().find("from Y/<lWbj*A
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" + entity.getName()); F7L &=K$2y
} d6{Gt"
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publicList findByNamedQuery(finalString sxKf&p;
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namedQuery){ `nXVE+E@
return getHibernateTemplate Jf)bHjC_V
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().findByNamedQuery(namedQuery); \6?A!w~6
} 3ya1'qUC
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publicList findByNamedQuery(finalString query, k#Of]mXXz
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finalObject parameter){ %
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return getHibernateTemplate yH 9!GS#
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().findByNamedQuery(query, parameter); ZoB*0H-
} @$"J|s3M
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publicList findByNamedQuery(finalString query, V=He_9B
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finalObject[] parameters){ $mmup|;(
return getHibernateTemplate >h2%[j=
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().findByNamedQuery(query, parameters); iI@jZVk
} .roqEasu8
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publicList find(finalString query){ p^nL&yIW,%
return getHibernateTemplate().find E9|eu\
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(query); ,/&'m13b/L
} t>GfM
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publicList find(finalString query, finalObject Z@8vL
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parameter){ 2$_9cF Wm
return getHibernateTemplate().find ^,F;M`[
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(query, parameter); $WYbm}j
} I$NhXZ)KT
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public PaginationSupport findPageByCriteria tt?58dm|
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(final DetachedCriteria detachedCriteria){ )#a[-.OI
return findPageByCriteria JXG"M#{
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); <Llp\XcZ
} (Rk_-9_E.
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public PaginationSupport findPageByCriteria =cN&A_L(
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(final DetachedCriteria detachedCriteria, finalint Rj F'x
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startIndex){ v5;I]?72l~
return findPageByCriteria 9Suu-A
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(detachedCriteria, PaginationSupport.PAGESIZE, ;N B:e
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startIndex); >{eCh$L
} g~7Ri-"
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public PaginationSupport findPageByCriteria ]sz3]"2
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(final DetachedCriteria detachedCriteria, finalint ,\ 2a=Fp
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pageSize, lnovykR
finalint startIndex){ ;U1UFqZ`
return(PaginationSupport) kyAXRwzI
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getHibernateTemplate().execute(new HibernateCallback(){ [s9O0i"
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publicObject doInHibernate @prG%vb"
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(Session session)throws HibernateException { ;fw1
Criteria criteria = ky
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detachedCriteria.getExecutableCriteria(session); t NsPB6Z
int totalCount = ,D\GGRw
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((Integer) criteria.setProjection(Projections.rowCount <APB11
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()).uniqueResult()).intValue(); d!KsNkk
criteria.setProjection 7NC=*A~
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(null); r'CM
List items = vHAg-Avc
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criteria.setFirstResult(startIndex).setMaxResults j1SMeDDM
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(pageSize).list(); )uv=S;+
PaginationSupport ps = th6+2&B6
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new PaginationSupport(items, totalCount, pageSize, iv phlw
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startIndex); 9Rek4<5
return ps; iX'rU@C
} 7&KT0a*
}, true); '(f/~"9B
} x^"ES%*
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public List findAllByCriteria(final aNyvNEV3C
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DetachedCriteria detachedCriteria){ )}TLC 2%
return(List) getHibernateTemplate )CX4kPj
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().execute(new HibernateCallback(){
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publicObject doInHibernate g}p;\o
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(Session session)throws HibernateException { iK?b~Q
Criteria criteria = "<}&GcJbz
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detachedCriteria.getExecutableCriteria(session); +A~\tK{
return criteria.list(); e4~>G?rM_
} +(uYwdcN
}, true); jjJ2>3avY
} qQ!1t>j+H
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public int getCountByCriteria(final Qb8KPpd
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DetachedCriteria detachedCriteria){ pfx3C*
Integer count = (Integer) ;['[?wk
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getHibernateTemplate().execute(new HibernateCallback(){ I@Xn3oN
publicObject doInHibernate O]f/r,4@
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(Session session)throws HibernateException { 3] 1-M
Criteria criteria = OB~X/
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detachedCriteria.getExecutableCriteria(session); IVlf=k
return
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criteria.setProjection(Projections.rowCount =8gHS[
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()).uniqueResult(); C"lJl k9g^
} 0A{/B/r
}, true); #YDr%>j
return count.intValue(); nC {K$
} g*w<*
} K78rg/`
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用户在web层构造查询条件detachedCriteria,和可选的 s4_/&h
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 p!Eft/A(
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PaginationSupport的实例ps。 rbT)=-(
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ps.getItems()得到已分页好的结果集 d--y
ps.getIndexes()得到分页索引的数组 x.1-)\
ps.getTotalCount()得到总结果数 !ZDzEP*
ps.getStartIndex()当前分页索引 m\/ Tj0e
ps.getNextIndex()下一页索引 ^\B:R,
ps.getPreviousIndex()上一页索引 G8W#<1LE
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ND<!4!R^
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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 :Q+5,v-c
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一下代码重构了。 kP xa7
#k3t3az2{
我把原本我的做法也提供出来供大家讨论吧: 1Y_w5dU
+h2eqNr
首先,为了实现分页查询,我封装了一个Page类: /ug8]Lo0
java代码: 8Ry74|`=R
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/*Created on 2005-4-14*/ k%[3Q>5iM
package org.flyware.util.page; xUF_1hY
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/** N8KQz_]9I
* @author Joa "l={)=R
* vaf&X]p
*/ )'l*Tl
publicclass Page { A?G IBjs
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/** imply if the page has previous page */ vi@Lz3}::
privateboolean hasPrePage; 39{{7(hh
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/** imply if the page has next page */ OdMO=Hy6d
privateboolean hasNextPage; ?Z\Yu'
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/** the number of every page */ PiFD^w
privateint everyPage; b'zR 9V
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/** the total page number */ }0,>2TTDN
privateint totalPage; elG;jB
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/** the number of current page */ 4Ij-Ilg)%
privateint currentPage; :hGPTf
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/** the begin index of the records by the current 93[DAs
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query */ u6:pV.p
privateint beginIndex; =O|c-k,f@
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/** The default constructor */ &Bx
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public Page(){ wix5B@
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} wwKh CmH
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/** construct the page by everyPage eUS
* @param everyPage 'H9=J*9oG
* */ Bs`$ i ;&
public Page(int everyPage){ c41: !u^
this.everyPage = everyPage; -ZW0k@5g
} 3E}EBJLsZ
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/** The whole constructor */ #G9 adK5
public Page(boolean hasPrePage, boolean hasNextPage, 57F%j3.|/
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int everyPage, int totalPage, df+t:a
int currentPage, int beginIndex){ P`U<7xF~
this.hasPrePage = hasPrePage; M8w5Ob
this.hasNextPage = hasNextPage; }4co)B"
this.everyPage = everyPage; 4([.xT
this.totalPage = totalPage; HEK-L)S.
*
this.currentPage = currentPage; l? #xAZx&_
this.beginIndex = beginIndex; }aB#z<B6
} #s5 pz8v
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/** cIXwiC8t
* @return Kr L>FI
* Returns the beginIndex. P+e KZo
*/ m9M
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publicint getBeginIndex(){ N#N0Q0W=
return beginIndex; X7UBopm&
} EjEFg#q
mN0=i(H<
/** bM;`s5d
* @param beginIndex vUQFQ
* The beginIndex to set. 7J >Gd
*/ x@P{l&:>
publicvoid setBeginIndex(int beginIndex){ m$>iS@R
this.beginIndex = beginIndex; b|^I<7
} wh 0<Uv
t$^l<ppQ
/** D)='8jV7
* @return ~Y5l+EF#
* Returns the currentPage. V6iL5&
*/ kL@Wb/K JP
publicint getCurrentPage(){ dOa!htx]
return currentPage; S_J :&9L
} '(@YK4_M
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/** (J:dK=O@Z
* @param currentPage q5&Ci`
* The currentPage to set. c
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*/ !J>A,D"-
publicvoid setCurrentPage(int currentPage){ \hk/1/siyF
this.currentPage = currentPage; [2$4| ;7
} /<)-q-W;
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/** }4jC_ZAupt
* @return ty1fcdFZM
* Returns the everyPage. D>ai.T%n
*/ g: %9jf
publicint getEveryPage(){ lHBI
return everyPage; O]u",J5
} 7r{qJ7$%
kL{;.WsB
/** 4dhqLVgL{
* @param everyPage s(@h 2:j
* The everyPage to set. f%^'P"R
*/ )jW(6
publicvoid setEveryPage(int everyPage){ /dHs &SU,
this.everyPage = everyPage; _ P ,@
} ESQ!@G/n
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/** gqiXmMm:9
* @return tR`S#rk
* Returns the hasNextPage. 0TE@xqW
*/ "|LQK0q3
publicboolean getHasNextPage(){ Q49BU@xX
return hasNextPage; }*;EFR 6'
} :Am-8
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/** dBEIMn@
* @param hasNextPage MB$a82bY
* The hasNextPage to set. a#(U2OP
*/ vgPUIxB@
publicvoid setHasNextPage(boolean hasNextPage){ D(Ix!G/
this.hasNextPage = hasNextPage; !c8L[/L
} /J%do]PDl
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/** vb =CFV#
* @return VZxTx0: ,
* Returns the hasPrePage. ~^o=a?L`<
*/ _,;%mK
publicboolean getHasPrePage(){ 'Tf9z+0;
return hasPrePage; _'iDF
} HFh /$VM
l)}t,!M6
/** b;vNq
* @param hasPrePage /5a;_
* The hasPrePage to set. tjzA)/T,4
*/ }OKL
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publicvoid setHasPrePage(boolean hasPrePage){ XCPb9<L
this.hasPrePage = hasPrePage; '"O&J}s;
} T&}Ye\%
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/** MQ w9X
* @return Returns the totalPage. u^Sv#K X
* ]6~k4
*/ W7e4pR?w
publicint getTotalPage(){ 8fO8Dob]\Y
return totalPage; XL"=vbD
} v&0d$@6/U
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/** PZ]5Hf1"
* @param totalPage i.@*tIK
* The totalPage to set. _EKF-&Q6
*/ <c%n?QK{
publicvoid setTotalPage(int totalPage){ ;~ee[W$1
this.totalPage = totalPage; /Dd\PjIH{
} #
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} b.Su@ay@(^
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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 .ev\M0Dt
n&7@@@cA
个PageUtil,负责对Page对象进行构造: }u^:MI
java代码: Ru7L>(Njs
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/*Created on 2005-4-14*/ +{vQSFW
package org.flyware.util.page; 9/46%=&