Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 0>6J -
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 `+CRUdr
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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 hbl:~O&a/
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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 h8&VaJ
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分页支持类: 7?9QlUO
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java代码: <U%4$83$
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package com.javaeye.common.util;
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import java.util.List; *'H0%GM
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publicclass PaginationSupport { 97l<9^$
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publicfinalstaticint PAGESIZE = 30; !w2J*E\
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privateint pageSize = PAGESIZE; Y&!-VW
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privateList items; NX%"_W/W
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privateint totalCount; akATwSrU
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privateint[] indexes = newint[0]; :%7y6V*
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privateint startIndex = 0; PvF3a`&r
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public PaginationSupport(List items, int O$zXDxn
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totalCount){ ]s_,;PG U
setPageSize(PAGESIZE); iga.B
setTotalCount(totalCount); ~ES6Qw`Oe
setItems(items); N!!=9'fGF
setStartIndex(0); opsjei@
} xl2;DFiYt
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public PaginationSupport(List items, int w_qX~d/
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totalCount, int startIndex){ .3>`y L
setPageSize(PAGESIZE); iOY: a
setTotalCount(totalCount); uJ-Q]yQ
setItems(items); A\ARjSdb
setStartIndex(startIndex); '^B[Krs'Z`
} Cq8.^=}_
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public PaginationSupport(List items, int +*uaB
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totalCount, int pageSize, int startIndex){ \.ukZqB3
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setPageSize(pageSize); f|f)Kys%5
setTotalCount(totalCount); W% @r
setItems(items); eF-U
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setStartIndex(startIndex); R&.mNji*
} fVf
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publicList getItems(){ ['m7Wry
return items; $,u>,
} *!oV?N[eA'
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publicvoid setItems(List items){ %9v l
this.items = items; DwmK?5 p
} sg`
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publicint getPageSize(){ VOJA}$
return pageSize; cYmgJBG
} Th_PmkvC
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publicvoid setPageSize(int pageSize){ 2$r8^}Nj?
this.pageSize = pageSize; G+7#!y Y
} ^?J3nf{
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publicint getTotalCount(){ ZSWZz8
return totalCount; *'w?j)}A9g
} Zzn
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publicvoid setTotalCount(int totalCount){ =E.!Ff4~(
if(totalCount > 0){ OEw#;l4 C
this.totalCount = totalCount; ] M`%@ps
int count = totalCount / ylm #Xa
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pageSize; PI\C*_.
if(totalCount % pageSize > 0) gFpub_
count++; "?%2`*\
indexes = newint[count]; TB}6iIe
for(int i = 0; i < count; i++){ ^XX_ qC'1
indexes = pageSize * :%_\!FvS
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} \&_pI2X
}else{ po\(O8#5U
this.totalCount = 0; 2cEvsvw>
} {8I,uQO
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publicint[] getIndexes(){ 8
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return indexes; N TcojA{V$
} p$=Z0p4%LL
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publicvoid setIndexes(int[] indexes){ $J8g)cS
this.indexes = indexes; / 3eGt7x#
} !\VzX
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publicint getStartIndex(){ v%rmfI U
return startIndex; |'Z+`HI
} Q.?(h! )9
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publicvoid setStartIndex(int startIndex){ 'ZJb`
if(totalCount <= 0) EXMW,
this.startIndex = 0; Q6T"8K/
elseif(startIndex >= totalCount) Fr~\ZL
this.startIndex = indexes 5S<Rz) 1r
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[indexes.length - 1]; L{&>,ww
elseif(startIndex < 0) AJ+\Qs(0
this.startIndex = 0; wBDHhXi0
else{ 0!-'4+"
this.startIndex = indexes ebn3r:IU-
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} +BeA4d8b
} DIABR%0
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publicint getNextIndex(){ CBO*2?]s
int nextIndex = getStartIndex() + ",l6-<s
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pageSize; 7t+d+sQ-l
if(nextIndex >= totalCount) mPU}]1*p
return getStartIndex(); Zs(BViTb|
else IsmZEVuC
return nextIndex; hraR:l
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} eR4ib-nS
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publicint getPreviousIndex(){ A!,c@Kv
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int previousIndex = getStartIndex() - No"i6R+
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pageSize; Tw djBMte
if(previousIndex < 0) \=D+7'3
return0; Ni8%K6]z
else (/At+MF3E
return previousIndex; ^vxx]Hji
} *^%+PQ
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} O1UArD
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抽象业务类 @ R[K8
java代码: `*cqT
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/** w[F})u]E
* Created on 2005-7-12 v-N4&9)%9
*/ O}%ES AB
package com.javaeye.common.business; s>:gL,%c
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import java.io.Serializable; tmOy"mq67
import java.util.List; !KJA)znx;(
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import org.hibernate.Criteria; }]H7uC!t
import org.hibernate.HibernateException; TE;f*!
import org.hibernate.Session; Rz&`L8Bz
import org.hibernate.criterion.DetachedCriteria; Zr1"'+-
import org.hibernate.criterion.Projections; (u^8=#
import r&Nh>6<&/
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org.springframework.orm.hibernate3.HibernateCallback; e,{k!BXU#'
import Dt<MEpbur
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org.springframework.orm.hibernate3.support.HibernateDaoS sVr|kvn2
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upport; L){V(*K '
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import com.javaeye.common.util.PaginationSupport; F53
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public abstract class AbstractManager extends iZ>P>x\
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HibernateDaoSupport { unc6 V%
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privateboolean cacheQueries = false; akk*f+TD`
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privateString queryCacheRegion; ZB|s/
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publicvoid setCacheQueries(boolean ZV:df 6S
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cacheQueries){ .?rs5[th*
this.cacheQueries = cacheQueries; b+q'xnA=>
} *^Zt)U1$|
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publicvoid setQueryCacheRegion(String NC!B-3?x
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queryCacheRegion){ T[^&ZS]s
this.queryCacheRegion = 4CchE15
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queryCacheRegion; jygUf|
} -~aG_Bp!($
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publicvoid save(finalObject entity){ %,1TAmJfHa
getHibernateTemplate().save(entity); PYC
} )Nx*T9!Q
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publicvoid persist(finalObject entity){ @67GVPcxl
getHibernateTemplate().save(entity); Y'jgp Vt
} 9mp`LT
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publicvoid update(finalObject entity){ |EdEV*.ej
getHibernateTemplate().update(entity); n:B){'S
} jbq x7x
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publicvoid delete(finalObject entity){ w)* H&8h@
getHibernateTemplate().delete(entity); =BN<)f^*s
} +|b#|>6
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publicObject load(finalClass entity, ^V1\boo=
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finalSerializable id){ GFE3p
return getHibernateTemplate().load GOGS"q
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(entity, id); *~4<CP+"0
} ~8UMwpl-
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publicObject get(finalClass entity, \1&4wzT
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finalSerializable id){ @aN~97
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return getHibernateTemplate().get F'>yBDm*OM
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(entity, id); AX&Emz-
} GIkeZV{4}
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publicList findAll(finalClass entity){ uPbdzUk$
return getHibernateTemplate().find("from wSCI?
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" + entity.getName()); \!jz1`]&{
} 9015PEO
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publicList findByNamedQuery(finalString ^tSwA anP\
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namedQuery){ q)o;iR
return getHibernateTemplate x4>"m(&%
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().findByNamedQuery(namedQuery); AxH`4=3<
} BMQ4i&kF|
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publicList findByNamedQuery(finalString query, 4,W,E4 7
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finalObject parameter){ }@jJv||
return getHibernateTemplate qhG2j;
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().findByNamedQuery(query, parameter); ^K: :g)
} ^\ln8!;
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publicList findByNamedQuery(finalString query, YahW%mv`d
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finalObject[] parameters){ 55TFBDc
return getHibernateTemplate pO fw *lD
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().findByNamedQuery(query, parameters); 6C<GYzzo
} %XBTN
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publicList find(finalString query){ XYD-5pG
return getHibernateTemplate().find b;*'j9ly
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(query); ZybfqBTD&c
} Wl=yxJu_(
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publicList find(finalString query, finalObject vfj{j=
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parameter){ (4RtoYWW
return getHibernateTemplate().find 7!(/7U6rP
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(query, parameter); Wi5Dl=
} Isvb;VT9L
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public PaginationSupport findPageByCriteria T*Ge67
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(final DetachedCriteria detachedCriteria){ -G? IXgG
return findPageByCriteria fWW B]h
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); }#M>CNi'PU
} #H
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public PaginationSupport findPageByCriteria C|g1:#0
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(final DetachedCriteria detachedCriteria, finalint 0|K<$e6IH
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startIndex){ E@)'Z6r1
return findPageByCriteria vaHtWz!P
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(detachedCriteria, PaginationSupport.PAGESIZE, a{}#t}
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startIndex); /pU`-
} B<Cg_C
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public PaginationSupport findPageByCriteria ~,)D
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(final DetachedCriteria detachedCriteria, finalint %[~g84@
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finalint startIndex){ LH @B\ mS
return(PaginationSupport) n"}*C|(k
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getHibernateTemplate().execute(new HibernateCallback(){ 5 A5t
publicObject doInHibernate @e\
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(Session session)throws HibernateException { [h&s<<#
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Criteria criteria = c=?6`m,"M
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detachedCriteria.getExecutableCriteria(session); U7g,@/Qx
int totalCount = &w`Ho)P
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((Integer) criteria.setProjection(Projections.rowCount eTw9c }[
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()).uniqueResult()).intValue(); XhWo~zh"
criteria.setProjection lk81IhI
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List items = =|empv#
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criteria.setFirstResult(startIndex).setMaxResults n_Y7*3/b-o
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(pageSize).list(); @;y@Hf'Jv
PaginationSupport ps = [ybK
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new PaginationSupport(items, totalCount, pageSize, =WZ9|e
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startIndex); \UM&|yk:
return ps; 8:*ZuR|~
} 7)2Q
}, true); Rg46V-"d,@
} Ly2!(,FB.
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public List findAllByCriteria(final :9x]5;ma
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DetachedCriteria detachedCriteria){ jA~omX2A
return(List) getHibernateTemplate SdMLO6-
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().execute(new HibernateCallback(){ 1P'L<z
publicObject doInHibernate 8I#^qr5
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(Session session)throws HibernateException { O7.eq524
Criteria criteria = _/.VXW
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detachedCriteria.getExecutableCriteria(session); 7(C)vtEO:
return criteria.list(); KjF8T7%
} %gSmOW2.c^
}, true); !Z{7X ^
} Vu4LC&q
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public int getCountByCriteria(final eOXu^M>:F
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DetachedCriteria detachedCriteria){ b
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Integer count = (Integer) 'gD./|Z0
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getHibernateTemplate().execute(new HibernateCallback(){ 28+{
publicObject doInHibernate `fJ;4$4
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(Session session)throws HibernateException { ER[$TH&
Criteria criteria = z^4+Un
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detachedCriteria.getExecutableCriteria(session); gXn`!
return gQu!(7WLI
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criteria.setProjection(Projections.rowCount Ky8,HdAq
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()).uniqueResult(); [(TmAEON
} I4UsDs*BD
}, true); d>#X+;-k
return count.intValue(); s,/C^E
} ;<+Z}d/g9
} 4 R8Qn^
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用户在web层构造查询条件detachedCriteria,和可选的 R `ob;>[Q
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ^HTvw~]5
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PaginationSupport的实例ps。 >lek@euqw
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ps.getItems()得到已分页好的结果集 e85E+S%
ps.getIndexes()得到分页索引的数组 gOE?
ps.getTotalCount()得到总结果数 o~4kJW#
ps.getStartIndex()当前分页索引 q%]5/.J
ps.getNextIndex()下一页索引 w6lx&K-
ps.getPreviousIndex()上一页索引 Wap\J7NY
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 LRS,bl3}/
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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 P~x4h{~Gd
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一下代码重构了。 )`gxaT>&l
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我把原本我的做法也提供出来供大家讨论吧: {S@,
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首先,为了实现分页查询,我封装了一个Page类: &=T>($3r94
java代码: '*&V7:
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/*Created on 2005-4-14*/ v=&xiw