Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ]Vm:iF#5P
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 oXgi#(y
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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 9>-]*7
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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 d "%6S*dL
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分页支持类: 6R|^IPOGp
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java代码: >* h3u7t
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package com.javaeye.common.util; Oq[YbQ'GE
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import java.util.List; 2rWPqG4e
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publicclass PaginationSupport { m9mkZ:r(kV
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publicfinalstaticint PAGESIZE = 30; #A 7|=E
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privateint pageSize = PAGESIZE; Vs9]Gm
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privateList items; V$g!#V
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privateint totalCount; 6 2LLfD
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privateint[] indexes = newint[0]; E]0Qz?
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privateint startIndex = 0; +ctJV>
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public PaginationSupport(List items, int JOo+RA5d
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totalCount){ 8 Y))/]R
setPageSize(PAGESIZE); "eIE5h
setTotalCount(totalCount); L}VQc9"gc
setItems(items); fF^A9{{BS
setStartIndex(0); l{Xy %8
} D22A)0+_
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public PaginationSupport(List items, int &sooXKlv|
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totalCount, int startIndex){ +wcif-
setPageSize(PAGESIZE); (!% w
setTotalCount(totalCount); ]\F}-I[
setItems(items); [6CWgQ%Ue
setStartIndex(startIndex); {Z}zT1kA
} Pv\-D<&@m
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public PaginationSupport(List items, int s1J(-O
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totalCount, int pageSize, int startIndex){ _VJG@>F9-
setPageSize(pageSize); *0z'!m12
setTotalCount(totalCount); ,"f2-KC4h
setItems(items); Go
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setStartIndex(startIndex); #zg"E<
} Hlz$@[$
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publicList getItems(){ [_HOD^
return items; 3aFD*S
} [fg-"-+:M
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publicvoid setItems(List items){ V82hk0*j
this.items = items; V eLGxc
} 9:7&`JlC#
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publicint getPageSize(){ Xj$'i/=-+c
return pageSize; Q1P=A:*]9
}
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publicvoid setPageSize(int pageSize){ lbC9^~T+
this.pageSize = pageSize; G=&nwSL
} j`%a2
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publicint getTotalCount(){ g1&q6wCg|
return totalCount; c:2LG_mQ
} Q:j)F|uhc
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publicvoid setTotalCount(int totalCount){ u6iX&%e
if(totalCount > 0){ EU.!/'<
this.totalCount = totalCount; ,=dc-%J
int count = totalCount / F_~A8y
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pageSize; 6b\JD.r*{
if(totalCount % pageSize > 0) P9q ZjBS
count++; nc;iJ/\4
indexes = newint[count]; eDsc_5I
for(int i = 0; i < count; i++){ %nyZ=&u
indexes = pageSize * wS+j^
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} +Os9}uKf
}else{ apWv+A
this.totalCount = 0; U P*5M
} Dmr3r[
} z~#d@c\
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publicint[] getIndexes(){ D(#6H~QN%
return indexes; @Wa,
} mLDuizWI
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publicvoid setIndexes(int[] indexes){ drS>~lSxB
this.indexes = indexes; TsY
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} ="
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publicint getStartIndex(){ lFa?l\jLXZ
return startIndex; 1Sd<cOEd
} b?k6-r$j
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publicvoid setStartIndex(int startIndex){ @s|yH"
if(totalCount <= 0) JdX!#\O
this.startIndex = 0; e)aH7Jj#
elseif(startIndex >= totalCount) IgPU^?sp
this.startIndex = indexes Vsd4;
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[indexes.length - 1]; 7$Lt5rn"}
elseif(startIndex < 0) fk\hrVP
this.startIndex = 0; .J\i !
else{ F{laA YE
this.startIndex = indexes "s7}eWM*a
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[startIndex / pageSize]; Pa"[&{ :
} rS_pv=0S
} @*iT%p_L
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publicint getNextIndex(){ )u]1j@Id
int nextIndex = getStartIndex() + F **/T
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pageSize; sn8r`59C
if(nextIndex >= totalCount) l*+9R
return getStartIndex(); 3EA`]&d>
else 7t|011<
return nextIndex; 0[7tJbN
} eI=:z/pd
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publicint getPreviousIndex(){ DUvF
int previousIndex = getStartIndex() - C ,[q#D4
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pageSize; ~iU@ns|g\
if(previousIndex < 0) HD;l1W)
return0; '%KaAi$
else -02.n}u>
return previousIndex; 2\9OT>
} mxmj
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} >JT^[i8[
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抽象业务类 (?#"S67
java代码: `WlQ<QEi
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/** TS@U0Ror
* Created on 2005-7-12 @%rj1Gn
*/ koy0A/\%
package com.javaeye.common.business; &?3P5dy_
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import java.io.Serializable; 2R~[B]2"r
import java.util.List; z?.XVk-
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import org.hibernate.Criteria; lfyij[6q+
import org.hibernate.HibernateException; ![/ QW
import org.hibernate.Session; 5~=wia
import org.hibernate.criterion.DetachedCriteria; x)-n[Fu
import org.hibernate.criterion.Projections;
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import )KcY<K
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org.springframework.orm.hibernate3.HibernateCallback; PvVn}i
import (zIF2qY
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org.springframework.orm.hibernate3.support.HibernateDaoS r,cK#!<%
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upport; AqjEz+TVt
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import com.javaeye.common.util.PaginationSupport; G[\3)@I
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public abstract class AbstractManager extends )/uCdSDIc
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HibernateDaoSupport { j$=MJN0
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privateboolean cacheQueries = false; !E9A=u{
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privateString queryCacheRegion; 8|-064i>
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publicvoid setCacheQueries(boolean KAm$^N5
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cacheQueries){ 1zc-$B`t
this.cacheQueries = cacheQueries; DWcEl:
} 2jH&@g$cl;
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publicvoid setQueryCacheRegion(String o3>D~9
bT c'E#
queryCacheRegion){ PZSi}j/
this.queryCacheRegion = )*_n/^m
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queryCacheRegion; 1iIag}?p
} #{suH7
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publicvoid save(finalObject entity){ :y(HOUB
getHibernateTemplate().save(entity); &*!) d"
} >}>cJh6
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publicvoid persist(finalObject entity){ cO/.(KBF
getHibernateTemplate().save(entity); MU5#ph
} -'Y@yIb
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publicvoid update(finalObject entity){ qjVhBu7A
getHibernateTemplate().update(entity); =%$BFg1a(
} GXx/pBdy[4
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publicvoid delete(finalObject entity){ /2AeJH\-
getHibernateTemplate().delete(entity); e8$OV4X
} "ba>.h,#'
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publicObject load(finalClass entity, %!QY:[
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finalSerializable id){ a]8}zSUK
return getHibernateTemplate().load Yeb-u+23
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(entity, id); pG9qD2Cf
} a gM I$
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publicObject get(finalClass entity, EHY}gG)
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finalSerializable id){ $Hbd:1%i
{
return getHibernateTemplate().get )#_:5^1
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(entity, id); @8qo(7<~Q
} E A}Vb(2
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publicList findAll(finalClass entity){ %44Z7
return getHibernateTemplate().find("from }iCcXZ&5^
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" + entity.getName()); q%xq\L.
} Q]oCzSi
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publicList findByNamedQuery(finalString <>|/U `
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namedQuery){ Fi!XaO
return getHibernateTemplate |<Gq^3 2
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().findByNamedQuery(namedQuery); :UdH}u!Ek
} V]I+>Zn| 7
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publicList findByNamedQuery(finalString query, ); <Le6
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finalObject parameter){
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return getHibernateTemplate rxVJB3P9
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().findByNamedQuery(query, parameter); `zZGL&9m`
} 2%F!aeX
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publicList findByNamedQuery(finalString query, Lj(y>{y
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finalObject[] parameters){ PC3-X['[
return getHibernateTemplate oykqCN
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().findByNamedQuery(query, parameters); 0 `L>t
} )Ap0" ?q
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publicList find(finalString query){ `LID*uD;_
return getHibernateTemplate().find yA#-}Y|]b
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(query); cA8"Ft{P)
} yF#:*Vz>
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publicList find(finalString query, finalObject PN&;3z Z
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parameter){ T)QT_ST.9
return getHibernateTemplate().find Vg+jF!\7
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(query, parameter); V9"?}cR/W;
} 9J!@,Zsh
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public PaginationSupport findPageByCriteria ^:c"%<"='
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(final DetachedCriteria detachedCriteria){ 1ukCH\YgU
return findPageByCriteria z'FJx2
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ;1&7v
} [MkXQwY
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public PaginationSupport findPageByCriteria G2{.Ew
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(final DetachedCriteria detachedCriteria, finalint %Z"I=;=nxI
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startIndex){ k7\h- yn{
return findPageByCriteria 9z:P#=Q:
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(detachedCriteria, PaginationSupport.PAGESIZE, (Es0n$Xb
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startIndex); 5ecAev^1-
} 7:h8b/9
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public PaginationSupport findPageByCriteria )$Erfu
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(final DetachedCriteria detachedCriteria, finalint ~?m vV`30&
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pageSize, 42Gv]X
finalint startIndex){ ,MtN_V-
return(PaginationSupport) -<'&"-
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getHibernateTemplate().execute(new HibernateCallback(){ *W#_W]Tu
publicObject doInHibernate .!\NM&E
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(Session session)throws HibernateException { :d7tzYT ^
Criteria criteria = fh1rmet&Ts
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detachedCriteria.getExecutableCriteria(session); k lRS:\dW
int totalCount = U(.3[x
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((Integer) criteria.setProjection(Projections.rowCount o+H;ZGT5H
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()).uniqueResult()).intValue(); BtyBZ8P;e
criteria.setProjection !Ol>![
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(null); `[.':"~2N
List items = G|Du/XYh
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criteria.setFirstResult(startIndex).setMaxResults A&$oiLc
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(pageSize).list(); L
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PaginationSupport ps = *E Z'S+wR
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new PaginationSupport(items, totalCount, pageSize, l%aiG+z%6}
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startIndex); ;_yp@.,\T
return ps; !,#42TY*X
} A.!V*1h{
}, true); A
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} p&nIUx"
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public List findAllByCriteria(final /$ 7_*4e
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DetachedCriteria detachedCriteria){ pZu2[
return(List) getHibernateTemplate S$!)Uc\)A
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().execute(new HibernateCallback(){ 7/"g}
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publicObject doInHibernate D Hkmn
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(Session session)throws HibernateException { r@_`ob RW;
Criteria criteria = 1D42+cy
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detachedCriteria.getExecutableCriteria(session); dF$Fd{\4^
return criteria.list(); HWFI6N
} E6iUa'
}, true); niZ/yW{w
} ncEOz1u
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public int getCountByCriteria(final p{knQ],
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DetachedCriteria detachedCriteria){ #x"dWi(
Integer count = (Integer) qB`zyd8yu
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getHibernateTemplate().execute(new HibernateCallback(){ }MKm>N
publicObject doInHibernate E>j*m}b
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(Session session)throws HibernateException { ?@"B:#l
Criteria criteria = LQ5 WS
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detachedCriteria.getExecutableCriteria(session); 4}:a"1P"
return iyw"|+
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criteria.setProjection(Projections.rowCount Fg8i}
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()).uniqueResult(); |k~\E|^
} :IFTiq5a;
}, true); =W1`FbR
return count.intValue(); "Jw6.q+
} (>*<<a22
} 9Wng(ef6G
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用户在web层构造查询条件detachedCriteria,和可选的 z= pb<Y@X
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 JV|GEn\@N
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PaginationSupport的实例ps。 [\NyBc
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ps.getItems()得到已分页好的结果集 wy5vn?T@
ps.getIndexes()得到分页索引的数组 7bioLE
ps.getTotalCount()得到总结果数 Gd$odKtI
ps.getStartIndex()当前分页索引 cDMA#gp
ps.getNextIndex()下一页索引 riqv v1Nce
ps.getPreviousIndex()上一页索引 $\>GQ~k
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 y?W8FL
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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 7-81,ADv(
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一下代码重构了。 !h&A^sAc
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我把原本我的做法也提供出来供大家讨论吧: N<ww&GXBX
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首先,为了实现分页查询,我封装了一个Page类: uUb[Dqn
java代码: R?g
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/*Created on 2005-4-14*/ o|G.tBpKg
package org.flyware.util.page; +hg|!SS@5
%\ -u&