Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 E^ P,*s
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 !%^^ \,
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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 kbTm^y"
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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 \m7-rV6r
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分页支持类: 2z6yn?'&L
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java代码: (]0%}$Fo
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package com.javaeye.common.util; iF-6Y0~8
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import java.util.List; ,uo'c_f(e
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publicclass PaginationSupport { ??PC
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publicfinalstaticint PAGESIZE = 30; IE;~?W"
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privateint pageSize = PAGESIZE; f!oT65Vmi
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privateList items; P_?gq>E8
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privateint totalCount; b8V~S'6VqO
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privateint[] indexes = newint[0]; o7J
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privateint startIndex = 0; &u /Nf&A
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public PaginationSupport(List items, int 56+s~hG
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totalCount){ ;3d"wW]}7K
setPageSize(PAGESIZE); FME3sa$
setTotalCount(totalCount); >TOu|r
setItems(items); +W:=e,=
setStartIndex(0); {Or;
} 0~ZFv Wv
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public PaginationSupport(List items, int D2](da:]8)
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totalCount, int startIndex){ [q/Abz'i
setPageSize(PAGESIZE); H<v'^*(
setTotalCount(totalCount); rqdE6y+^
setItems(items); kSR\RuY*
setStartIndex(startIndex); 8Eakif0CO
} ;pqg/>W'
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public PaginationSupport(List items, int 2_n7=&
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totalCount, int pageSize, int startIndex){ o_@4Sl8
setPageSize(pageSize); n#q<`}u,
setTotalCount(totalCount); *pAV2V(!23
setItems(items); u+'tfFds&
setStartIndex(startIndex); IPgt|if^
} .QA }u ,EN
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publicList getItems(){ |?qquD 4=
return items; }._eIx"
} A6:es_
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publicvoid setItems(List items){ JHz
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this.items = items; pQshUm"_
} S`#w+C#EW
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publicint getPageSize(){ G]+&!4
return pageSize; k`0>36
} A%`[mc]4#
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publicvoid setPageSize(int pageSize){ zUKmx y@
this.pageSize = pageSize; G'6@+$ppS
} |&FkksNAl\
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publicint getTotalCount(){ clNkph
return totalCount; ~(Q)"s\1I
} :^kZ.6Q@
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publicvoid setTotalCount(int totalCount){ +)y^'Qs
if(totalCount > 0){ { jhr<
this.totalCount = totalCount; VY~yg*
int count = totalCount / +6';1Nb@
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pageSize; (vb
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if(totalCount % pageSize > 0) 5[A@gw0u
count++; zx-81fx+k
indexes = newint[count]; B?4boF?~
for(int i = 0; i < count; i++){ nq6@6GRG
indexes = pageSize * QlJ)F{R8il
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} /Y'Vh^9/T
}else{ AQ_|:
this.totalCount = 0; 73xAG1D$r
} G*-b}f
} T;,cN7>>O
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publicint[] getIndexes(){ _>|
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return indexes; R~)\3] "2m
} @7?#Y|`
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publicvoid setIndexes(int[] indexes){ #7MUJY+
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this.indexes = indexes; KTP8?Q"n0
} "J4WzA%i
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publicint getStartIndex(){ pov)Z):}G<
return startIndex; gLy&esJl1
} m06ALD_
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publicvoid setStartIndex(int startIndex){ @}@Z8$G^
if(totalCount <= 0) O*0l+mop
this.startIndex = 0; YhDtUt}?
elseif(startIndex >= totalCount) 8=gjY\Dp
this.startIndex = indexes F;+|sMrq
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[indexes.length - 1]; ~},=OF-b
elseif(startIndex < 0) w]]8dz
this.startIndex = 0; h"_MA_]~
else{ dHv68*^\'
this.startIndex = indexes =~=*&I4Dp
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[startIndex / pageSize]; d4?Mi2/jF
} ;i<|9{;
} Bs O+NP
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publicint getNextIndex(){ FLGk?.x$\
int nextIndex = getStartIndex() + fpFhn
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pageSize; [uI|DUlI6o
if(nextIndex >= totalCount) Bh;7C@dq
return getStartIndex(); @JyK|.b#0
else vSi.txV2
return nextIndex; 5 N#3a0)
} )?X-(4
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publicint getPreviousIndex(){ )i!o8YB
int previousIndex = getStartIndex() - YbTxn="_
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pageSize; U$_xUG
if(previousIndex < 0) ~ xft
return0; >D(R YI
else +\F'iAs@
return previousIndex; A^)?Wt%*
} 0V'nK V"|
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抽象业务类 [Pq}p0cD
java代码: |MFF7z{%
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/** ( 5tvfz%
* Created on 2005-7-12 G0^2Wk[
*/ 6~1|qEe6I
package com.javaeye.common.business; o1FF"tLkN
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import java.io.Serializable; Il=
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import java.util.List; 7z!tKs"TMT
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import org.hibernate.Criteria; %l,,_:7{
import org.hibernate.HibernateException; B[Zjfc
import org.hibernate.Session; V3c l~
import org.hibernate.criterion.DetachedCriteria;
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import org.hibernate.criterion.Projections; E#ul IgD
import }Ub6eXf(2
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org.springframework.orm.hibernate3.HibernateCallback; 9hOJvQ2U]
import %we u 1f
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org.springframework.orm.hibernate3.support.HibernateDaoS V>A.iim
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upport; `"&da#N]
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import com.javaeye.common.util.PaginationSupport; ;uwRyd
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public abstract class AbstractManager extends A7%:05
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HibernateDaoSupport { f"u%J/e &
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privateboolean cacheQueries = false; 11<KpxKpk
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privateString queryCacheRegion; {
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publicvoid setCacheQueries(boolean BbgnqzU
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cacheQueries){ ++V=s\d7
this.cacheQueries = cacheQueries; +;#Y]xy:
} 7tcPwCc{
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publicvoid setQueryCacheRegion(String ? P(
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queryCacheRegion){ " e}3:U5n
this.queryCacheRegion = !!`!|w
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queryCacheRegion; l&?}hq^'Dn
} [$ejp>'Ud
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publicvoid save(finalObject entity){ )*,5"CO
getHibernateTemplate().save(entity); k[HAkB \{
} xYhrO
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publicvoid persist(finalObject entity){ 8AnP7}n;?'
getHibernateTemplate().save(entity); m"o ;L3
} q~*t@
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publicvoid update(finalObject entity){ -eN\ !
getHibernateTemplate().update(entity); sK7+Q
} @O[}QB?/fi
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publicvoid delete(finalObject entity){ 4*'pl.rb>
getHibernateTemplate().delete(entity); IaT$6\>
} sfOHarww
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publicObject load(finalClass entity, G=A,9@+c
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finalSerializable id){ JXu$ew>q
return getHibernateTemplate().load w\DVzeW(
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(entity, id); &&VqD
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} yb/%?DNQT
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publicObject get(finalClass entity, 'ul~7h;n
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finalSerializable id){ I;Bjfv5
return getHibernateTemplate().get UGuxV+Nwf
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(entity, id); QC X8IIHG
} cdG|m[
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publicList findAll(finalClass entity){ Hv\-_>}K
return getHibernateTemplate().find("from 7?kIVP1r
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" + entity.getName()); o4zM)\;F
} H)>;/#!r-
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publicList findByNamedQuery(finalString FN%m0"/Z{t
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namedQuery){ CJXg@\\/
return getHibernateTemplate 2w-51tqm
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().findByNamedQuery(namedQuery); Pw;!uag
} TM|)Ljm
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publicList findByNamedQuery(finalString query, Xixqxm*8
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finalObject parameter){ aN $}?
return getHibernateTemplate YI.w-K\
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().findByNamedQuery(query, parameter); bLd#xXl
} o`q_wdy?
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publicList findByNamedQuery(finalString query, C,pJ`:P
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finalObject[] parameters){ lME)?LOI
return getHibernateTemplate /M*a,o
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().findByNamedQuery(query, parameters); p$x{yz3
} " $ew~;z
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publicList find(finalString query){ sPb=82~z
return getHibernateTemplate().find S.d^T](
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(query); v!FMs<
} !DI{:I_h(
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publicList find(finalString query, finalObject \a=D
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parameter){ FA}_(Hf.[
return getHibernateTemplate().find .LuB\o$
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(query, parameter); !grVR157P
} yin'vgQ
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public PaginationSupport findPageByCriteria 7zv1wb
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(final DetachedCriteria detachedCriteria){ jOyvDY9\
return findPageByCriteria j$TwL;
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); UEzb^(8>
} ,E$@=1)
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public PaginationSupport findPageByCriteria 2"d!(J6}K
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(final DetachedCriteria detachedCriteria, finalint KV*xApb9y
}irn'`I
startIndex){ bC3 F
return findPageByCriteria /De^
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(detachedCriteria, PaginationSupport.PAGESIZE, ]Y| 9?9d
s #S%#LM
startIndex); vc]cNz:mQ
} Y&^ P"Dw
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public PaginationSupport findPageByCriteria Vm|Y$C
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(final DetachedCriteria detachedCriteria, finalint ad_`x
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pageSize, j}AFE
finalint startIndex){ d.2mT?`#
return(PaginationSupport) v i)%$~
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getHibernateTemplate().execute(new HibernateCallback(){ .?>5-od2
publicObject doInHibernate snt(IJQ
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(Session session)throws HibernateException { n
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Criteria criteria = _6Eu2|vM&
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detachedCriteria.getExecutableCriteria(session); "sgjWo6
int totalCount = /LM4-S
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((Integer) criteria.setProjection(Projections.rowCount cf7v[ZZ}
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()).uniqueResult()).intValue(); Y=T'WNaL)0
criteria.setProjection ZK'-U,Y.H7
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(null); kpI{KISQu
List items = \M"UmSB o
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criteria.setFirstResult(startIndex).setMaxResults KA276#
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(pageSize).list(); o|j*t7
PaginationSupport ps = IjfxR mV
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new PaginationSupport(items, totalCount, pageSize, "aF8l<1xn
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startIndex); Ji;mHFZ*FU
return ps; 0gn@h/F2%
} /V?H4z[G
}, true); {gKN d*[*
} ]}UgS+g>$
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public List findAllByCriteria(final "|m|E/Z-9
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DetachedCriteria detachedCriteria){ <q,+ON\'
return(List) getHibernateTemplate Cj*-[EL<
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().execute(new HibernateCallback(){
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publicObject doInHibernate M-
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(Session session)throws HibernateException { T|"7sPgGR
Criteria criteria = 60Z]M+8y8
{NCF6Mk
detachedCriteria.getExecutableCriteria(session); s(_+!d6
return criteria.list(); cW``M.d'F
} w#^U45y1v
}, true); 3g~^LZ66
} $iM=4
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public int getCountByCriteria(final D0;tcm.$
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DetachedCriteria detachedCriteria){ @:x"]!1
Integer count = (Integer) ap}5ElMR
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getHibernateTemplate().execute(new HibernateCallback(){ t!_x(u
publicObject doInHibernate Be}$I_95\P
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(Session session)throws HibernateException { E:nt)Ef,
Criteria criteria = oH2!5;A|
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detachedCriteria.getExecutableCriteria(session); =raA?Bp3;(
return 9B)(>~q
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criteria.setProjection(Projections.rowCount Bfd-:`Jk
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()).uniqueResult(); QT#6'>&7-b
} G*\h\@
}, true); ,kgF2K!
return count.intValue(); )uP[!LV[e
} =w<v3 wWN4
} _N3}gFh>
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用户在web层构造查询条件detachedCriteria,和可选的 yoqa@ V
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 *(cU]NUH_
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PaginationSupport的实例ps。 $gp!w8h
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ps.getItems()得到已分页好的结果集 &B!%fd.'
ps.getIndexes()得到分页索引的数组 v6e%#=
ps.getTotalCount()得到总结果数 H:a|x#"
ps.getStartIndex()当前分页索引 J fcMca
ps.getNextIndex()下一页索引 T`$KeuL
ps.getPreviousIndex()上一页索引 v\ZBv zd
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 H]&!'\aUz
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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 7tC|^#G
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一下代码重构了。 -O&"|
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我把原本我的做法也提供出来供大家讨论吧: ,m07p~,V
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首先,为了实现分页查询,我封装了一个Page类: .#^0pv!
java代码: xKp0r1}
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/*Created on 2005-4-14*/ um8AdiK
package org.flyware.util.page; R9.HD?H@
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/** g=A$<