Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 &.4_4"l(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 -XG$ 0
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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 9d}nyJ
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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 5g2+Ar(
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分页支持类: ZSt
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java代码: v>!}cB/6
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package com.javaeye.common.util; E8<i PTJs
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import java.util.List; I>Yp=R
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publicclass PaginationSupport { bLF0MVLM
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publicfinalstaticint PAGESIZE = 30; i}"JCqo2
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privateint pageSize = PAGESIZE; DP]|}8~L
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privateList items; W)hby`k
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privateint totalCount; #7ZBbq3=
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privateint[] indexes = newint[0]; JCfToFB
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privateint startIndex = 0; |c/rHEZ
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public PaginationSupport(List items, int =ApT#*D)o
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totalCount){ ".<p R}
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setPageSize(PAGESIZE); e'&{KD,-T
setTotalCount(totalCount); rP4@K%F9jB
setItems(items); n_meJm.
setStartIndex(0); BZshTP[`
} 5xUPqW%3
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public PaginationSupport(List items, int 2]ljm]\l
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totalCount, int startIndex){ u;g}N'"
setPageSize(PAGESIZE); &W!@3O{~.
setTotalCount(totalCount); HI 61rXNF
setItems(items); .r'.5RI A
setStartIndex(startIndex); \0*LfVr;P
} a$:N9&P
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public PaginationSupport(List items, int ^]gl#&"D
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totalCount, int pageSize, int startIndex){ #JucOWxjY
setPageSize(pageSize); rID]!7~
setTotalCount(totalCount); gHshG;z*
setItems(items); 1Tr=*b %f
setStartIndex(startIndex); %b6wo?%*
} IPR396J+-
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publicList getItems(){ vq:j?7
return items; 6si-IJ
} 1j,Y
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publicvoid setItems(List items){ I5?LD=tt
this.items = items; 9~I WGj?
} 0in6z
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publicint getPageSize(){ -wRzMT19MG
return pageSize; d*HAKXd&:j
} 7Y:s6 R|
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publicvoid setPageSize(int pageSize){ IRa*}MJe
this.pageSize = pageSize; W0kq>s4
} 8<!9mgh
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publicint getTotalCount(){ bmpB$@
return totalCount; t+ ]+Gn
} ,#loVLy
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publicvoid setTotalCount(int totalCount){ &ii
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if(totalCount > 0){ ^pa).B.`T
this.totalCount = totalCount;
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int count = totalCount / jN0v<_PJED
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pageSize; etVE8N'
if(totalCount % pageSize > 0) e>.xXg6Zn
count++; 5H5Kt9DoW
indexes = newint[count]; C@i g3fhV
for(int i = 0; i < count; i++){ dD%m=x
indexes = pageSize * 6}$cDk`dz
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} vcHDFi
}else{ WAbhBA
this.totalCount = 0; l1S1CS
} [-ecKPx
} ZxWV,s&p
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publicint[] getIndexes(){ /([aD~.
return indexes; x;Q2/YZ#
} uItKs u
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publicvoid setIndexes(int[] indexes){ <T]kpP<lC
this.indexes = indexes; ZlzFmNe60
} /xzL!~g`6<
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publicint getStartIndex(){ |IvX7%*]~
return startIndex; F/Xhm91^
} p\K5B,
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publicvoid setStartIndex(int startIndex){ )LG/n
if(totalCount <= 0) {ex]_V>
this.startIndex = 0; p
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elseif(startIndex >= totalCount) 6BnjT
this.startIndex = indexes xT/&'$@{)
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[indexes.length - 1]; &AVi4zV
elseif(startIndex < 0) zl5S)/A
this.startIndex = 0; 3^Y-P8.zdB
else{ ^8iy(
this.startIndex = indexes ITV}f#
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[startIndex / pageSize]; vY6|V$
} gnGw7V
} ~08v]j
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publicint getNextIndex(){ i]v!o$7
int nextIndex = getStartIndex() + .uP$M(?j
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pageSize; OZ6%AUot
if(nextIndex >= totalCount) 92i#It}-/
return getStartIndex(); ~ocr^V{"<~
else wHmEt ORo
return nextIndex; R)=<q]Ms
}
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publicint getPreviousIndex(){ C1J'. !
int previousIndex = getStartIndex() - -_3.]o/J
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pageSize; |8B[yr.b
if(previousIndex < 0) 3]i1M%'i
return0; C6`8dn
else RUEUn
return previousIndex; kL-+V)Kl
} -Da_#_F
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} e#wn;wo?
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抽象业务类 (:1j-
java代码: 9SPu 4i
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/** PJLA^e C7>
* Created on 2005-7-12 ]WG\+1x9
*/ <Wd$6
package com.javaeye.common.business; E=y#~W
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import java.io.Serializable; !q X7
import java.util.List; "elh~K
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import org.hibernate.Criteria; {9)f~EbM!
import org.hibernate.HibernateException; =k'dbcfO$9
import org.hibernate.Session; y!#1A?|k
import org.hibernate.criterion.DetachedCriteria; Umqm5*P(
import org.hibernate.criterion.Projections; #ua#$&p
import ?@nu]~
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org.springframework.orm.hibernate3.HibernateCallback; e\89;)
import C8?/$1|RL
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org.springframework.orm.hibernate3.support.HibernateDaoS mUjA9[@
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upport; VbN]z:
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import com.javaeye.common.util.PaginationSupport; G*QQpSp
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public abstract class AbstractManager extends v1}
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HibernateDaoSupport { ,=mn*
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privateboolean cacheQueries = false; gnv4.f:
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privateString queryCacheRegion; ~&pk</Dl
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publicvoid setCacheQueries(boolean .Ee8s]h5W
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cacheQueries){ g$<@!
this.cacheQueries = cacheQueries; R}0cO^V
} %spR7J\"/
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publicvoid setQueryCacheRegion(String th]9@7UE,
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queryCacheRegion){ xzy9~))o
this.queryCacheRegion = zn M"P|A
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queryCacheRegion; A%9"7]:
} 6)TFb,
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publicvoid save(finalObject entity){ wj/r)rv
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getHibernateTemplate().save(entity); ua0k)4|
} Sh"} c2
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publicvoid persist(finalObject entity){ 03MB,
getHibernateTemplate().save(entity); 4'{j'kuv
} $tb$gO
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publicvoid update(finalObject entity){ _+UD>u{
getHibernateTemplate().update(entity); l_8t[
} s?=J#WV1y
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publicvoid delete(finalObject entity){ 5!AzEB
getHibernateTemplate().delete(entity); 3&}wfK]X
} /_ LUys/0
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publicObject load(finalClass entity, !D1F4v[c=
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finalSerializable id){ ~oOOCB
return getHibernateTemplate().load yXDf;`J
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(entity, id); }C)
} s |qB;
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publicObject get(finalClass entity, -8-Aqh8|
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finalSerializable id){
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return getHibernateTemplate().get FO*Py)/rX
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(entity, id); /P,J);Y
} ed&,
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publicList findAll(finalClass entity){ dL v\H&
return getHibernateTemplate().find("from = uOFaZ4
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" + entity.getName()); 75{QBlf<
} #MI}KmH
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publicList findByNamedQuery(finalString ];IUiS1
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namedQuery){ -FJ5N}R
return getHibernateTemplate 65MR(+3
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().findByNamedQuery(namedQuery); 5HmX-+XpK
} y*P[*/g
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publicList findByNamedQuery(finalString query, KaOS!e'
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finalObject parameter){ w2Pkw'a{
return getHibernateTemplate -[ F<u
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().findByNamedQuery(query, parameter); 3EAu#c@q"
} `57ffQR9
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publicList findByNamedQuery(finalString query, o-/Xa[yC
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finalObject[] parameters){ "Sl";.
return getHibernateTemplate h4ZrD:D0\
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().findByNamedQuery(query, parameters); m\j'7mZ1
} 6N6d[t"
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publicList find(finalString query){ (0^u
return getHibernateTemplate().find :)bm+xWFF
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(query); 2TiUo(MK
} z$;z&X$j
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publicList find(finalString query, finalObject oc>,5 x
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parameter){ \Z<' u;
return getHibernateTemplate().find J,k9?nkY /
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(query, parameter); )j!22tlL
} NO"=\Zn6
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public PaginationSupport findPageByCriteria ]*Zg(YA
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(final DetachedCriteria detachedCriteria){ ,D>$N3;
return findPageByCriteria jFnq{Lt
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); KI#),~nS
} Q+gQ"l,95
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public PaginationSupport findPageByCriteria P)ZGNtO9fG
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(final DetachedCriteria detachedCriteria, finalint =p:D_b
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startIndex){ #~ UG9@a
return findPageByCriteria p-r}zc9@
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(detachedCriteria, PaginationSupport.PAGESIZE, ^#p Su
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startIndex); _=8x?fC:rl
} wF[^?K '
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public PaginationSupport findPageByCriteria %YA=W=Yd
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(final DetachedCriteria detachedCriteria, finalint 4)i/B99k
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pageSize, h@t&n@8O?
finalint startIndex){ u\.7#D>
return(PaginationSupport) UC3?XoT\
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getHibernateTemplate().execute(new HibernateCallback(){ u-yQP@^H
publicObject doInHibernate %jim] ]<S[
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(Session session)throws HibernateException { -#|J
Criteria criteria = _6(QbY'JV`
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detachedCriteria.getExecutableCriteria(session); rx
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int totalCount = Mq8jPjL
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((Integer) criteria.setProjection(Projections.rowCount D~G24k6b3
?,O{,2}
()).uniqueResult()).intValue(); 7xz|u\?_2
criteria.setProjection ?(n|ykXwc
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(null); 3u3(BY{"\F
List items = 0sLR5A
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criteria.setFirstResult(startIndex).setMaxResults sTU`@}}
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(pageSize).list(); 7ae8nZ3&
PaginationSupport ps = ?n8gB7(FA
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new PaginationSupport(items, totalCount, pageSize, Szsq|T
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startIndex); ,GA2K .:#
return ps; 8.ll]3))
} swntz
}, true); V \,Z (
} _t_X`
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public List findAllByCriteria(final VZ5EV'D8!
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DetachedCriteria detachedCriteria){ CfNHv-jDL
return(List) getHibernateTemplate |x3.r t
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().execute(new HibernateCallback(){ a=+qR:wT
publicObject doInHibernate k,LeBCqGcb
:
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(Session session)throws HibernateException { 7loIX Qw
Criteria criteria = !'Q/9%g
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detachedCriteria.getExecutableCriteria(session); q["CT&0
return criteria.list(); $*tq$DZ4&
} %qfql
}, true); mx y>
} G'{$$+U^K
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public int getCountByCriteria(final A]id*RtY
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DetachedCriteria detachedCriteria){ ]L@VpHEj
Integer count = (Integer) -^`]tF`M
, |,DXw
getHibernateTemplate().execute(new HibernateCallback(){ uW3`gwwlU
publicObject doInHibernate V\^3I7F
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(Session session)throws HibernateException { 9
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Criteria criteria = -{dsl|Dl
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detachedCriteria.getExecutableCriteria(session); {7LO|E}7
return p,.+i[V
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criteria.setProjection(Projections.rowCount 7{e0^V,\k
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()).uniqueResult(); `j{q$Y=AG
} uO%G,b
}, true); \$n?J(N
return count.intValue(); po~V{>fUm
} ;cgc\xm>
} @0S3`[/U
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用户在web层构造查询条件detachedCriteria,和可选的 t84(k zcC
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ]PJb 9$f2
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PaginationSupport的实例ps。 ;+t~$5
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ps.getItems()得到已分页好的结果集 Fsv:SL+5
ps.getIndexes()得到分页索引的数组 c+|,qm
ps.getTotalCount()得到总结果数 Hg\+:}k&9
ps.getStartIndex()当前分页索引 AQ:cim`
ps.getNextIndex()下一页索引 $R4[TQY).!
ps.getPreviousIndex()上一页索引 He^u+N@B
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 + Bk"
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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 O)NEt
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一下代码重构了。 k$1ya7-@
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我把原本我的做法也提供出来供大家讨论吧: W|XTa
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首先,为了实现分页查询,我封装了一个Page类: \,| Xz|?C
java代码: >tTNvb5
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/*Created on 2005-4-14*/ q{I,i(%m8
package org.flyware.util.page; 22lC^)`TE
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/** __<