Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 = *~Q5F
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 G2e0\}q
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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 6<+ 8[o
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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@0&
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分页支持类: 1pHt3Vc(G
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java代码: &0QtHcXpR
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package com.javaeye.common.util; FQGh+.U
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import java.util.List; SwVdo|%.?
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publicclass PaginationSupport { )3RbD#?
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publicfinalstaticint PAGESIZE = 30; L fx$M
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privateint pageSize = PAGESIZE; E2a00i/9Y
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privateList items; @[(<oX%
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privateint totalCount; ] f~mR_E
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privateint[] indexes = newint[0]; k6PHyt`3'
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privateint startIndex = 0; =zXii{t
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public PaginationSupport(List items, int H<bK9k)E
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totalCount){ h.D*Y3=<
setPageSize(PAGESIZE); .ECT
setTotalCount(totalCount); ?Pw(
setItems(items); -yH8bm'0"
setStartIndex(0); FELTmQUV
} P-~kxb9aa
Lm}J&^>
public PaginationSupport(List items, int eFiUB
&@anv.D
totalCount, int startIndex){ G,6Zy-Y9
setPageSize(PAGESIZE); O.g!k"nas&
setTotalCount(totalCount); -F+dmI,1$
setItems(items); 7TW</g(
setStartIndex(startIndex); 3(/J(8
} gkN
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5$C]$o}
public PaginationSupport(List items, int M7 Z9(3Va
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totalCount, int pageSize, int startIndex){ |rg4j
setPageSize(pageSize); }3&~YBx;:
setTotalCount(totalCount); si|DxDx
setItems(items); wqyrs|P
setStartIndex(startIndex); Q+]9Glz9
} y@?t[A#v
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publicList getItems(){ Z?}yPsOb
return items; f.cQp&&]r
} a6&+>\o
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publicvoid setItems(List items){ !Hp H
this.items = items; !^EdB}@yS
} ]@D#<[5\
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publicint getPageSize(){ |#6))Dh
return pageSize; $<N!2[I L
} _jr'A -M
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publicvoid setPageSize(int pageSize){ OKH4n/pq
this.pageSize = pageSize; MPg"n-g*
} ao(lj
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publicint getTotalCount(){ YrWC\HR_
return totalCount; jQc.@^#+x
} M
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publicvoid setTotalCount(int totalCount){ S`qa_yI)Ed
if(totalCount > 0){ n,E=eNc
this.totalCount = totalCount; |VPJaiC~
int count = totalCount / vS$_H<;P
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pageSize; KS6H`Mm}/
if(totalCount % pageSize > 0) \&S-lsLY
count++;
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indexes = newint[count]; ;F:~HrxT}
for(int i = 0; i < count; i++){ ue;o:>G
indexes = pageSize * _poe{@h!
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i; ;=?f0z<
} dmkd.aP4
}else{ WLe9m02r
this.totalCount = 0; 7Ib/Cm0d|
} }}g.L|
} I|#1u7X%]
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publicint[] getIndexes(){ ;HOOo>%_K
return indexes; %di]1vQ
} U(jZf{`Mz
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publicvoid setIndexes(int[] indexes){ 4CT _MAj
this.indexes = indexes; > (.V(]{3y
} L
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publicint getStartIndex(){ w>q:&Q
return startIndex; qf7oG0
} .1&~@e%=-
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publicvoid setStartIndex(int startIndex){ *yx&4)Or
if(totalCount <= 0) dcGs0b
this.startIndex = 0; M^E\L
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elseif(startIndex >= totalCount) y[W<vb+F
this.startIndex = indexes \
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w^1!
[indexes.length - 1]; 4KkjBPV
elseif(startIndex < 0) H*Tc.Ie
this.startIndex = 0; [9:'v@Ph
else{ JFvVRGWB
this.startIndex = indexes RKY~[IQ,
9EE},D
[startIndex / pageSize]; P9\!JH!
} .Kn)sD1
} D]s8w
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publicint getNextIndex(){ z`^DQ8+\j
int nextIndex = getStartIndex() + z DP
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pageSize; Wx i|(}
if(nextIndex >= totalCount) 4K(AXk
return getStartIndex(); z/,qQVv=}4
else 1ud+~y$K
return nextIndex; NiCH$+c\
} aa'u5<<W
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publicint getPreviousIndex(){ L6xLD X7y
int previousIndex = getStartIndex() - *7ggw[~
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pageSize; |9;6Cp
if(previousIndex < 0) ,EAf/2C
return0; !&3iZQGWv
else &@c?5Ie5
return previousIndex; vtv^l3
} JVoW*uA
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} }[[
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抽象业务类 qNLG- m,n<
java代码: ~1NK@=7T
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/** 9'qU4I
* Created on 2005-7-12 YSvZ7G(m>
*/ '%u7XuU-]
package com.javaeye.common.business; .)7r /1o
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import java.io.Serializable; >#q2KXh
import java.util.List; `+4>NT6cu9
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import org.hibernate.Criteria; UogkQ& B
import org.hibernate.HibernateException; c\n&Z'vK
import org.hibernate.Session; V>{G$(v$
import org.hibernate.criterion.DetachedCriteria; Bc/'LI.%
import org.hibernate.criterion.Projections; M<A*{@4$w&
import rc*iL
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org.springframework.orm.hibernate3.HibernateCallback; n9;z=
import ,+u.FQv~
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org.springframework.orm.hibernate3.support.HibernateDaoS =aWj+ggd@
8>E_bxC
upport; 'THcO*<
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import com.javaeye.common.util.PaginationSupport; 9(9+h]h+3
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public abstract class AbstractManager extends aKLA_-E
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HibernateDaoSupport { hnQDm$k
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privateboolean cacheQueries = false; BZ] 6W/0
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privateString queryCacheRegion; jm-J_o;}z6
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publicvoid setCacheQueries(boolean (1
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cacheQueries){ h\oAW?^
this.cacheQueries = cacheQueries; V~Zi #o
} *4i)aj
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publicvoid setQueryCacheRegion(String 7,i}M
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queryCacheRegion){ E%eTjvvxus
this.queryCacheRegion = |H:JwxH
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queryCacheRegion; DFgr,~
} 7x/S4Gs'4
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publicvoid save(finalObject entity){ z (N3oBW
getHibernateTemplate().save(entity); U~~Y'R\NU
} `EV"
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publicvoid persist(finalObject entity){ R^}}-Dvr
getHibernateTemplate().save(entity); G}o?lo\#h
} L<kIzB !
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publicvoid update(finalObject entity){ T;cyU9
getHibernateTemplate().update(entity); Wq bfZx
} g/)$-Z)Nu
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publicvoid delete(finalObject entity){ R&w2y$
getHibernateTemplate().delete(entity); L53qQej<
} $jt UQ1
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publicObject load(finalClass entity, ;l^4/BR
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finalSerializable id){ v&6=(k{E@R
return getHibernateTemplate().load -mSiZ
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(entity, id); ] gN]Cw\L
} Z_Gb9
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publicObject get(finalClass entity, '%W'HqVcG1
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finalSerializable id){ 4Xna}7
return getHibernateTemplate().get <OKzb3e
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(entity, id); z|Z<S+=f
} &cjE+
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publicList findAll(finalClass entity){ b&LfL$
return getHibernateTemplate().find("from z3l=aAw8
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" + entity.getName()); dx=\Pq
} }3t bqFiH
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publicList findByNamedQuery(finalString 2b+0}u>a
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namedQuery){ NF&
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return getHibernateTemplate dcFqK~
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().findByNamedQuery(namedQuery); =F!DwaZ
} u3!aKXnv<
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publicList findByNamedQuery(finalString query, S.;>:Dd[K
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finalObject parameter){ 8\-Q(9q(
return getHibernateTemplate IAr
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().findByNamedQuery(query, parameter); eqt+EiH
} e*O-LI2O
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publicList findByNamedQuery(finalString query, RB5fn+FiZ
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finalObject[] parameters){ JHY0J
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return getHibernateTemplate E$z)$`"1
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().findByNamedQuery(query, parameters); B,sv! p+q5
} 5xZ *U
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publicList find(finalString query){ FzOr#(^
return getHibernateTemplate().find cD-.thHO
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(query); 4(aDi;x "w
} 7m;2M]BRi
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publicList find(finalString query, finalObject &9CKI/K:
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parameter){ *}9i@DP1,
return getHibernateTemplate().find =*q|568
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(query, parameter); RjO9E.nm
} I0 y+,~\
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public PaginationSupport findPageByCriteria 55vpnRM
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(final DetachedCriteria detachedCriteria){ @`:n +r5u
return findPageByCriteria C;DNL^
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); gf]biE"k
} ({3hX"C@Q
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public PaginationSupport findPageByCriteria 5YJn<XEc
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(final DetachedCriteria detachedCriteria, finalint iST r;>A
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startIndex){ Vp
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return findPageByCriteria *|n::9
{ 7y.0_Y
(detachedCriteria, PaginationSupport.PAGESIZE, P5;LM9W
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startIndex); sIuk
} TlExw0i!
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public PaginationSupport findPageByCriteria qC9$xIWq
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,
(final DetachedCriteria detachedCriteria, finalint j(|G) F
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pageSize, [@ ]f@Wd
finalint startIndex){ _A*5BAB:h(
return(PaginationSupport) jB]tq2i
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getHibernateTemplate().execute(new HibernateCallback(){ W1X\!Y
publicObject doInHibernate G| pZ
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(Session session)throws HibernateException { wiWpzJz
Criteria criteria = <dx
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detachedCriteria.getExecutableCriteria(session); bWv4'Y!p
int totalCount = -If-c'"G
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((Integer) criteria.setProjection(Projections.rowCount U^4
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()).uniqueResult()).intValue(); ./@!k[
criteria.setProjection #n^P[Zw
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(null); YmM+x=G:
List items = VOBzB]
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criteria.setFirstResult(startIndex).setMaxResults eR r.j
]=p@1
(pageSize).list(); :.['e`
PaginationSupport ps = ^Yei9bXl
}LS:f,1oGp
new PaginationSupport(items, totalCount, pageSize,
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startIndex); |w2H5f{fR
return ps; gnmKh>0@6o
} J=4R" _yo
}, true); u-Pa:wm0-
} o.t$hv|
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public List findAllByCriteria(final ^yUel.N5"
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DetachedCriteria detachedCriteria){ PL/as3O^A
return(List) getHibernateTemplate .Gv9RKgd~
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().execute(new HibernateCallback(){ #q1Qa_LXc
publicObject doInHibernate 0es[!
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(Session session)throws HibernateException { k"|4
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Criteria criteria = '3Yci(t+
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detachedCriteria.getExecutableCriteria(session); Z~{0XG\Y
return criteria.list(); 2g1[E_?
} /5Wy)-
}, true); a'w~7y!}
} R6HMi#eF
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public int getCountByCriteria(final Pg"
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brJ_q0@
DetachedCriteria detachedCriteria){ O(;K]8
Integer count = (Integer) hK9Trr wau
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getHibernateTemplate().execute(new HibernateCallback(){ {dJC3/Rf
publicObject doInHibernate !b0'd'xe
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(Session session)throws HibernateException { kH1hsDe|&y
Criteria criteria = ";38vjIV
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detachedCriteria.getExecutableCriteria(session); 9;s:Bo
return v5l)T}Nb
^'i(@{{o\
criteria.setProjection(Projections.rowCount `;b@a<Wl
{4Y@DQ-
()).uniqueResult(); `O(ec
} :G9+-z{Y&
}, true); 2#l<L>#
return count.intValue(); N-|E^XIV
} Etty{r}
}
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用户在web层构造查询条件detachedCriteria,和可选的 }\}pSqW
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 C4],7"Sw
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PaginationSupport的实例ps。 Pcut#8?
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ps.getItems()得到已分页好的结果集 V%'`nJ!
ps.getIndexes()得到分页索引的数组 QlJ
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ps.getTotalCount()得到总结果数 \bqIe}3V7
ps.getStartIndex()当前分页索引 PHl{pE*
ps.getNextIndex()下一页索引 G$pTTT6#
ps.getPreviousIndex()上一页索引 $,q~ q^0
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 SA&0f&07i
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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 'HTr02riY
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一下代码重构了。 u
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我把原本我的做法也提供出来供大家讨论吧: Wr Ht
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首先,为了实现分页查询,我封装了一个Page类: \$YKw0K
java代码: 6M9t<DQV
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/*Created on 2005-4-14*/ $2qZds[
package org.flyware.util.page; I&~kwOP
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/** {'VP_ZS1v
* @author Joa r(xh5{^x
* O6Bs!0,
*/ rF:C({y
publicclass Page { z(2pl}
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/** imply if the page has previous page */ 4Gs#_|!
privateboolean hasPrePage; yQE|FbiA
eznt "Rr2
/** imply if the page has next page */ WZO8|hY
privateboolean hasNextPage; q`z/ S>
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/** the number of every page */ `s5<PCq
privateint everyPage; .?R~!K{`
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/** the total page number */ w>Iw&US
privateint totalPage; W1'F)5(?7
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/** the number of current page */ M#X8Rs1`
privateint currentPage; a0I+|fR
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/** the begin index of the records by the current 1BT]_ cP
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query */ 4-;"w;
privateint beginIndex; {Q],rv|;
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/** The default constructor */ 6 "fYSn>
public Page(){ Q ^X
F: %-x=q
} l?pF?({
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/** construct the page by everyPage mM&Sq;JJ;
* @param everyPage [8|Y2Z\N
* */ .j?`U[V%a
public Page(int everyPage){ `G*7y7
this.everyPage = everyPage; zQ3m@x
} hkV;(Fr&z
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/** The whole constructor */ 8*7t1$
public Page(boolean hasPrePage, boolean hasNextPage, HT&CbEa4'
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int everyPage, int totalPage, F5UvD[i
int currentPage, int beginIndex){ ]v^/c~"${
this.hasPrePage = hasPrePage; fy+fJ )4sj
this.hasNextPage = hasNextPage; mdjPKrF<
this.everyPage = everyPage; eewhT^
this.totalPage = totalPage; {gh41G;n
this.currentPage = currentPage; 2gM=vaiH=
this.beginIndex = beginIndex; I\e?v`e
} n@5Sp2p
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/** |dIP &9
* @return Qn=3b:S-
* Returns the beginIndex. e_'/4
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*/ ]0v;;PfVl6
publicint getBeginIndex(){ ^b|Z<oF
return beginIndex; 3m3ljy
} mGx!{v~i&
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/** >[t0a"
* @param beginIndex ^u'hl$`^
* The beginIndex to set. "XPBNv\>_
*/ ,b[}22
publicvoid setBeginIndex(int beginIndex){ $!Z><&^/
this.beginIndex = beginIndex; l{b<rUh5W
} .OhpItn
m 2c>RCq
/** @1+C*
* @return 8VG6~>ux'>
* Returns the currentPage. ^n8ioL\*i
*/ AI
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publicint getCurrentPage(){ -& Qm"-?:
return currentPage; t^_0w[
} HI iMq'H^
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/** |-Rg].
* @param currentPage s5/5>a V
* The currentPage to set. c:#<g/-{wM
*/ VnlgX\$}
publicvoid setCurrentPage(int currentPage){ ++ O
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this.currentPage = currentPage; &UzeNL"]
} .CJQ]ECl7p
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/** 0|6]ps4Z7
* @return 5x$/.U
* Returns the everyPage. LDg"s0n#
*/ [3$L}m
publicint getEveryPage(){ 05sWN 0
return everyPage; qY,z,oAF
} C]@v60I
j^4KczJl
/** Q?"o.T';
* @param everyPage ~kDR9s7
* The everyPage to set. [tN^)c`s/
*/ 0!4;."S
publicvoid setEveryPage(int everyPage){ }iGpuoXT`
this.everyPage = everyPage; m/{HZKh
} T,'{0q
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/** K)-Gv|*t
* @return 4)]w"z0Pc
* Returns the hasNextPage. euxkw]`h6
*/ cL+--$L
publicboolean getHasNextPage(){ $O\I9CGr$
return hasNextPage; Tbf@qid e
} A%Ov.~&\G
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/** =1!,A
* @param hasNextPage `/|S.a#g
* The hasNextPage to set. JA=9EnTU
*/ Sf_q;Ws
publicvoid setHasNextPage(boolean hasNextPage){ "hE/f~\
this.hasNextPage = hasNextPage; !@6P>HzY$
} It5U=PU
1/ZvcdYB
/** B/:+(|
* @return os:/-A_m
* Returns the hasPrePage. .,-,@ZK
*/ 4jWzYuI&J
publicboolean getHasPrePage(){ [Ej#NHs
return hasPrePage; Y 6NoNc]h
} $A4rdhvd
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/** Ou26QoT9XI
* @param hasPrePage PpxLMe]
* The hasPrePage to set. 7@[HRr
*/ 0XkLWl|k
publicvoid setHasPrePage(boolean hasPrePage){ >DFpL$oP
this.hasPrePage = hasPrePage; 5hhiP2q
} /*V:Lh
dkHye>
/** ] "ZL<?3g
* @return Returns the totalPage. (31ia"i%
* c
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*/ V6c>1nZ
publicint getTotalPage(){ a{4Wg:
return totalPage; :,<G6"i
} sIM^e
S!LLC{
/** U{ZE|b.?b
* @param totalPage uG5RE
* The totalPage to set. &-S;.}
*/ BLepCF38
publicvoid setTotalPage(int totalPage){ U-U^N7
this.totalPage = totalPage; "7> o"FQ
} .5S< G)Ja
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} I.4o9Z[?
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 ^R g=*L
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个PageUtil,负责对Page对象进行构造: ZqDanDM
java代码: vb&1 S
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/*Created on 2005-4-14*/ g9T9TQ-O
package org.flyware.util.page; C >@T+xOZ
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import org.apache.commons.logging.Log; sI/]pgt2
import org.apache.commons.logging.LogFactory; xr;:gz!h
""Ub^:ucD
/** 8C[W;&Y=
* @author Joa &N