Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 "4\
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 A5yVxSF
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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 %5gdLm!p
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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 Ph[MXb:*
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分页支持类: fF0i^E<
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java代码: ]5f;Kz)
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package com.javaeye.common.util; 6Bjo9,L
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import java.util.List; hbx4[Pf
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publicclass PaginationSupport { C(G.yd
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publicfinalstaticint PAGESIZE = 30; zx}+Q B0
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privateint pageSize = PAGESIZE; 2 3PRb<q
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privateList items; JK =A=
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privateint totalCount; bLai@mL&a
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privateint[] indexes = newint[0]; V'XEz;Ze
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privateint startIndex = 0; [Xu8~c X
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public PaginationSupport(List items, int gA(npsUHI
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totalCount){ 6AAvsu:
setPageSize(PAGESIZE); ;b0Q%TDh
setTotalCount(totalCount); U~:H>
setItems(items); k=mQG~
setStartIndex(0); bu _ @>`S
} E#,"C`&*
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public PaginationSupport(List items, int Qt+D ,X
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totalCount, int startIndex){ Dz~0(
setPageSize(PAGESIZE); -pYmM d,
setTotalCount(totalCount); Ea@0>_U|
setItems(items); _ Lh0
setStartIndex(startIndex); _C/|<Ot:
} M?h{'$T
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public PaginationSupport(List items, int ['}|#3*w
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totalCount, int pageSize, int startIndex){ ?l9sj]^w
setPageSize(pageSize); kzZgNv#G;
setTotalCount(totalCount); :.+w'SEn4M
setItems(items); {:gx*4}q8
setStartIndex(startIndex); HqWWWCWal
} Zmyq6.1q~
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publicList getItems(){ I_ZJnu<
return items; w"9h_;'C_
} Z5q%L!4G
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publicvoid setItems(List items){ _VT{2`|})
this.items = items; 5qnei\~
} }gv'r
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publicint getPageSize(){ FSQB{9,H
return pageSize; \|Af26
} .z,-ThTH@\
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publicvoid setPageSize(int pageSize){ MeBTc&S<
this.pageSize = pageSize; DS(>R!bb
}
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publicint getTotalCount(){ K]m#~J3d>
return totalCount; *U1*/Q.
} (10t,n$
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publicvoid setTotalCount(int totalCount){ b/UXO$_~-
if(totalCount > 0){ 6-wpR
this.totalCount = totalCount; m=6?%'
H}
int count = totalCount / v"1&xe^4
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pageSize; 1!1JT;gG^9
if(totalCount % pageSize > 0) |Gz<I
count++; Jq` Dvz
indexes = newint[count]; G ky*EY
for(int i = 0; i < count; i++){ m-O*t$6
indexes = pageSize * ,h^6y
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} ^`yhN
}else{ @sn:%/x _
this.totalCount = 0; LOkgeJuWv
} i\IpS@/{-v
} ~},H+A!?
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publicint[] getIndexes(){ R9A:"sJ
return indexes; 2@a'n@-
} KJT N"hF
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publicvoid setIndexes(int[] indexes){ \2/X$x<?X
this.indexes = indexes; _ooHB>sH
} wetu.aMp
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publicint getStartIndex(){ Zl3l=x h
return startIndex; la{?&75]
} t_Eivm-,B
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publicvoid setStartIndex(int startIndex){ c:K/0zY
if(totalCount <= 0) zdJPMNHg
this.startIndex = 0; Nt8"6k_
elseif(startIndex >= totalCount) X]}ai5
this.startIndex = indexes N#M>2b<A/T
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[indexes.length - 1]; ZiR}S
elseif(startIndex < 0) G%~V b
this.startIndex = 0; |gA@$1+}
else{ :/(G#ZaV
this.startIndex = indexes IA0vSF:
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[startIndex / pageSize]; TE&E f$h
} rrU(>jA!
} ;*qXjv&
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publicint getNextIndex(){ g=D]=&H
int nextIndex = getStartIndex() + M{p6&eg
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pageSize; '~b
if(nextIndex >= totalCount) Ut~YvWc9
return getStartIndex(); -!+i
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else {@KLN<
return nextIndex; ruagJS)+
} x%X3FbF]
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publicint getPreviousIndex(){ A&1EOQ=N
int previousIndex = getStartIndex() - eJqx,W5MK]
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pageSize; e[x,@P`
if(previousIndex < 0) %GjG.11V,_
return0; [5xm>Y&}
else Lb$Uba-_
return previousIndex; O8hx}dOjA
} 60~*$`
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} MDa[bQNM
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抽象业务类 %tkqWK:
java代码: qX5]\nX&G
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/** {!(
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* Created on 2005-7-12 ;woK96"{t
*/ 1Mq"f7X8
package com.javaeye.common.business; n\Is}Czl
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import java.io.Serializable; k7:ISjJ
import java.util.List; L~+aD2E {
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import org.hibernate.Criteria; ShRMzU
import org.hibernate.HibernateException; =:T"naY(
import org.hibernate.Session; P `<TO
import org.hibernate.criterion.DetachedCriteria; u@Gum|_=N
import org.hibernate.criterion.Projections; J8FzQ2
import :6C R~p
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org.springframework.orm.hibernate3.HibernateCallback; XH0{|#hwN
import d+P<ce2G
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org.springframework.orm.hibernate3.support.HibernateDaoS Nc6y]eGz
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import com.javaeye.common.util.PaginationSupport; SN[yC
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public abstract class AbstractManager extends .nr%c*JUp
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HibernateDaoSupport { +Rd\*b
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privateboolean cacheQueries = false; 8fvKVS
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privateString queryCacheRegion; tF*Sg{:bCa
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publicvoid setCacheQueries(boolean MAqETjB
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cacheQueries){ L) _ VdB
this.cacheQueries = cacheQueries; eG1A7n'6W
} YedF%
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publicvoid setQueryCacheRegion(String /;TD n>lq
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queryCacheRegion){ JKYtBXOl
this.queryCacheRegion = M9Z9s11{H
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queryCacheRegion; S-6i5H"B&
} |a1zJ_t4
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publicvoid save(finalObject entity){ pdQaVe7tRo
getHibernateTemplate().save(entity); *JW.ca}
} 2#`d:@r
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publicvoid persist(finalObject entity){ >&Ye(3w&
getHibernateTemplate().save(entity); ' z^v}~
} ,=ju^_^sA
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publicvoid update(finalObject entity){ ]~m=b`o
getHibernateTemplate().update(entity); m&*0<N
} UBwYwm0
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publicvoid delete(finalObject entity){ T2T?)_f /
getHibernateTemplate().delete(entity); W.7u6F`
} h1j1PRE
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publicObject load(finalClass entity, w `M/0.)V
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finalSerializable id){ iQh:y:Jo1&
return getHibernateTemplate().load 2JHF*zvO-
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(entity, id); R'1"`@fG
} ^> d"D
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publicObject get(finalClass entity, 3v~}hV/RUy
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finalSerializable id){ w/0;N`YB
return getHibernateTemplate().get 9Xh<vh8&
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(entity, id); ]G~u8HPH!m
} -fz( ]d
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publicList findAll(finalClass entity){ z\IZ5'
return getHibernateTemplate().find("from ,+_gx.H2j
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" + entity.getName()); #b=*hi`E
} 0pe*DbYP5
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publicList findByNamedQuery(finalString SMm$4h R
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namedQuery){ y*sqnzgF
return getHibernateTemplate \?k"AtL
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().findByNamedQuery(namedQuery); ,Hc,]TPC4
} ?7*J4.
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publicList findByNamedQuery(finalString query, ubi6=
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finalObject parameter){ ?rwHkPJ{*
return getHibernateTemplate H!g9~a
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().findByNamedQuery(query, parameter); %t-}dC&
} ]O M?e
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publicList findByNamedQuery(finalString query, iHOvCrp+X
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finalObject[] parameters){ yH@2nAn
return getHibernateTemplate p["20?^
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().findByNamedQuery(query, parameters); t4,(W`
} FE?^}VH
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publicList find(finalString query){ O$&4{h`
return getHibernateTemplate().find k{C|{m
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(query); ^$\#aTyFK
}
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publicList find(finalString query, finalObject V^p XbDRl
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parameter){ af2yng
return getHibernateTemplate().find P0szY"}
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(query, parameter); }2_i<4,L
} y
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public PaginationSupport findPageByCriteria Q-S5("
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(final DetachedCriteria detachedCriteria){ t.m C q4{
return findPageByCriteria <3aW3i/jTc
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); !p"Ijz5
} 8U&93$
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public PaginationSupport findPageByCriteria J|I&{
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(final DetachedCriteria detachedCriteria, finalint EY
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startIndex){ h7W<$\P
return findPageByCriteria B6a
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(detachedCriteria, PaginationSupport.PAGESIZE, 2JRX ;s~
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startIndex); %Nm69j-5%
} h/F,D_O>ZO
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public PaginationSupport findPageByCriteria 9l9|w4YJs
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(final DetachedCriteria detachedCriteria, finalint Ni 5Su
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pageSize, j*)K>
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finalint startIndex){ zd3%9r j$
return(PaginationSupport) {VrjDj+Xy
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getHibernateTemplate().execute(new HibernateCallback(){ [6t!}q
publicObject doInHibernate |#!P!p}
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(Session session)throws HibernateException { HGRH9W
Criteria criteria = 6*H F`@(
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detachedCriteria.getExecutableCriteria(session); |F#L{=B
int totalCount = t{)J#8:g
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((Integer) criteria.setProjection(Projections.rowCount gcfEJN4'
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()).uniqueResult()).intValue();
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criteria.setProjection (*2kM|
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(null); wsNM'~(
List items = Mw+8p}E
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criteria.setFirstResult(startIndex).setMaxResults .)eX(2j\
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(pageSize).list(); T&`H )o
PaginationSupport ps = *aF<#m v
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new PaginationSupport(items, totalCount, pageSize, _n+./B
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startIndex); KzC`*U[
return ps; )FrXD3p
} P7GF"/
}, true); o!+jPwEU
} R\wG3Oxol
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public List findAllByCriteria(final 7Q9zEd"d
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DetachedCriteria detachedCriteria){ ?0VLx,kp
return(List) getHibernateTemplate
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().execute(new HibernateCallback(){ i`1QR@11
publicObject doInHibernate G6b\4}E
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(Session session)throws HibernateException { M6J/S
Criteria criteria = CL$mK5u
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detachedCriteria.getExecutableCriteria(session); :8~*NSEFd
return criteria.list(); 3[L)q2;}$N
} "K8<X
}, true); 5b9>a5j1;
} )'RLK4l
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public int getCountByCriteria(final zV }-_u.
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DetachedCriteria detachedCriteria){ i+V4_`
Integer count = (Integer) 3wBc`vJ!
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getHibernateTemplate().execute(new HibernateCallback(){ v*nX
publicObject doInHibernate E30VKh |
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(Session session)throws HibernateException { Iz#h:O
Criteria criteria = (Js'(tBhiU
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detachedCriteria.getExecutableCriteria(session); 7='M&Za
return N*Owfr1N
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criteria.setProjection(Projections.rowCount K6.*)7$#
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()).uniqueResult(); 46dh@&U
} EnrRnVB
}, true); RJ%~=D
return count.intValue(); l*]L=rC
} ;!k1LfN
} *p.P/w@1
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用户在web层构造查询条件detachedCriteria,和可选的 pt;kN&A^
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 @^vVou_
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PaginationSupport的实例ps。 'W~O?
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ps.getItems()得到已分页好的结果集 iaq0\d.[7
ps.getIndexes()得到分页索引的数组 cvbv\G'aT
ps.getTotalCount()得到总结果数 $b#"Rv
ps.getStartIndex()当前分页索引 ~h;c3#wuc
ps.getNextIndex()下一页索引 :_tsS)Q2m
ps.getPreviousIndex()上一页索引 %cD7}o:u
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 B_[^<2_
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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 tWi@_Rlx;
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一下代码重构了。 i+&*W{Re
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我把原本我的做法也提供出来供大家讨论吧: Pb.-Z@
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首先,为了实现分页查询,我封装了一个Page类: x~}RL-Y2o
java代码: Q^8C*ekfg!
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/*Created on 2005-4-14*/ 4ow)vS(
package org.flyware.util.page; "qb3\0O
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/** c{j0A;XMS
* @author Joa H~@E&qd
* @R?S-*o
*/ OFCOMM
publicclass Page { `,&h!h((
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/** imply if the page has previous page */ L&