Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 [^/a`Kda8
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 S^EAE]
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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 {%y|A{}c
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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 >mEfd=p
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分页支持类: Q^05n$ tI
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java代码: a+~b3
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package com.javaeye.common.util; _X=6M
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import java.util.List; IQ-l%x[fue
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publicclass PaginationSupport { anfnqa8
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publicfinalstaticint PAGESIZE = 30; 4ZR2U3jd1
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privateint pageSize = PAGESIZE; C6@*l~j
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privateList items; tc\ZYCFr
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privateint totalCount; n^5Q
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privateint[] indexes = newint[0]; 5gC>j(
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privateint startIndex = 0; ),j6tq[
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public PaginationSupport(List items, int tw\1&*:
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totalCount){ 0,.|-OZ
setPageSize(PAGESIZE); &_hEM~{
setTotalCount(totalCount);
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setItems(items); SK 5]7C2
setStartIndex(0); v?Cakwu
} b+hN\/*]
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public PaginationSupport(List items, int DvOvtd
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totalCount, int startIndex){ T*8K.yw2
setPageSize(PAGESIZE); d'3"A"9R7-
setTotalCount(totalCount); $}z/BV1I
setItems(items); Wyeb1
setStartIndex(startIndex); 7-u'x[=m
} Q&?0 ^;r
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public PaginationSupport(List items, int ssoE ,6kS
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totalCount, int pageSize, int startIndex){ ^}wF^ _
setPageSize(pageSize); NZ6:ZzM
setTotalCount(totalCount); sdyNJh7Jr
setItems(items); u$(ei2f
setStartIndex(startIndex); ({!H()
} j?k|-0
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publicList getItems(){ h/8p2Mrqi
return items; VhAJ1[k4!
} pQC|_T#u
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publicvoid setItems(List items){ *n[B Bz
this.items = items; 7^LCP*
} CQrP%}`r
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publicint getPageSize(){ Q1|zX@,
return pageSize; PDCb(5
} Ze#DFe$
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publicvoid setPageSize(int pageSize){ e+4Eiv
this.pageSize = pageSize; Z5)v
} EYCZuJxv
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publicint getTotalCount(){ D<<q5gG
return totalCount; Wv;,@xTZ
} ?.lo[X<,*
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publicvoid setTotalCount(int totalCount){ IXR'JZ?fH
if(totalCount > 0){ 'RzO`-dr
this.totalCount = totalCount; u=vBjaN2_w
int count = totalCount / gG}H5uN
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pageSize; a)Pr&9I
if(totalCount % pageSize > 0) ;Bzx}7A
count++; 7n+,!oJ
indexes = newint[count]; oayu*a.
for(int i = 0; i < count; i++){ ki/Cpfq40*
indexes = pageSize * O|^J;fS:
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i; niW"o-}
} ;$gV$KB:xA
}else{ |_-w{2K
this.totalCount = 0; o90g;Vog
} tm2lxt
} lQvgq
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publicint[] getIndexes(){ S7#dyAX8
return indexes; nKnrh]hX
} eMmNQRmH
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publicvoid setIndexes(int[] indexes){ hlze]d?z
this.indexes = indexes; bqp^\yu-E
} $8AW
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publicint getStartIndex(){ @pYC!;n+
return startIndex; la!U
} ,9_O4O%
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publicvoid setStartIndex(int startIndex){ [6_.Y*}N
if(totalCount <= 0) .P")S|
this.startIndex = 0; mU?~s7
elseif(startIndex >= totalCount) uozq^sy
this.startIndex = indexes q5'G]j{,Z
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[indexes.length - 1]; llWY7u"
elseif(startIndex < 0) 1EC;t1.7
this.startIndex = 0; HuU$x;~
else{ z\"
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this.startIndex = indexes ;Oqf{em];
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[startIndex / pageSize]; CmBgay
} >P\eHR,{-
} c_M[>#`
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publicint getNextIndex(){ BmccSC;o4
int nextIndex = getStartIndex() + :
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pageSize; qBh@^GxY),
if(nextIndex >= totalCount) o$+R
return getStartIndex(); -1v9
else r Dlu&
return nextIndex; 6DK).|@$r
} UntFkoO
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publicint getPreviousIndex(){ 5$HG#2"Kb#
int previousIndex = getStartIndex() - kD%MFT4
y %61xA`#
pageSize; bu_@A^ys
if(previousIndex < 0) ^"54Q^SH
return0; |uw48*t
else Haekr*1%
return previousIndex; ~_ZK93o(
} vc p{Gf|^
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} l>pB\<LL
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抽象业务类 .KC V|x;QW
java代码: O2pE"8=4Q
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/** p5vQ.Ni*\-
* Created on 2005-7-12 X{,mj"(w
*/ ex1!7A!}g
package com.javaeye.common.business; N|2d9E
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import java.io.Serializable; xR&:]M[Vg
import java.util.List; n_RZ:<Gr
t=@d`s:R2
import org.hibernate.Criteria; kc P ZIP:
import org.hibernate.HibernateException; f'(F'TE
import org.hibernate.Session; d v[.u{#tP
import org.hibernate.criterion.DetachedCriteria; Y$n+\K
import org.hibernate.criterion.Projections; r,0D I
import %aK[Yvo6
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org.springframework.orm.hibernate3.HibernateCallback; nAl
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import L
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org.springframework.orm.hibernate3.support.HibernateDaoS hp(MKfh H
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upport; g |?}a]G
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import com.javaeye.common.util.PaginationSupport; U,v`md@PX
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public abstract class AbstractManager extends Kb<c||2Nh5
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HibernateDaoSupport { _BJ:GDz>
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privateboolean cacheQueries = false; 3!gz^[!?EN
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privateString queryCacheRegion; ||pOiR5
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publicvoid setCacheQueries(boolean H,w8+vZ4\
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cacheQueries){ &ZC{ _t
this.cacheQueries = cacheQueries; [qRww]g;P|
} H7&y79mB
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publicvoid setQueryCacheRegion(String `Kf@<=
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queryCacheRegion){ mIYKzu_k=
this.queryCacheRegion = z8}QXXa
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queryCacheRegion; +[uh);vD`G
} JluA?B7E
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publicvoid save(finalObject entity){ oYf+I
getHibernateTemplate().save(entity); juWXB+d2Y
} S$fS|N3]%
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publicvoid persist(finalObject entity){ vvxD}p=y
getHibernateTemplate().save(entity); E2w-b^,5
} PDA9.b<q0
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publicvoid update(finalObject entity){ l{C]0^6>i
getHibernateTemplate().update(entity); XfVdYmii
} UMd.=HC L
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publicvoid delete(finalObject entity){ C za}cF
getHibernateTemplate().delete(entity); k`N*_/(|n
} ">1wPq&
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publicObject load(finalClass entity, 8Y RT0/V
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finalSerializable id){ zzI,iEG
return getHibernateTemplate().load 9M9Fif.
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(entity, id); lg$aRqI29
} ,z#D[5
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publicObject get(finalClass entity, KP0(w(q
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finalSerializable id){ NwYQ6VEA
return getHibernateTemplate().get M\CzV$\y
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(entity, id); WK*tXc_[b
} Y1sK sdV
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publicList findAll(finalClass entity){ ?87\_wL/j
return getHibernateTemplate().find("from Vfy@?x=
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" + entity.getName()); 8w[O%
} >@bU8}rT
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publicList findByNamedQuery(finalString {{P 3Z[
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namedQuery){ qG
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return getHibernateTemplate yY UAH-
j1{`}\e
().findByNamedQuery(namedQuery); }6%\/d1~ 6
} V*te8HIe
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publicList findByNamedQuery(finalString query, Z.@n7G
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finalObject parameter){ L9Zz-Dr s
return getHibernateTemplate Gd\/n*j
db1ZNw
().findByNamedQuery(query, parameter); m ne)c[Qn
} ivl %%nY'
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publicList findByNamedQuery(finalString query, -wC}JVVcK
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finalObject[] parameters){ _)Txg2?=
return getHibernateTemplate GOA
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g_l-@
().findByNamedQuery(query, parameters); _7:Bxx4B
} =*ErN
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publicList find(finalString query){ l{8O'4;
return getHibernateTemplate().find g]z k` R5
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(query); lW#2 ox
} Y9#dAI[Gce
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publicList find(finalString query, finalObject MNe/H\
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parameter){ RF2I_4
return getHibernateTemplate().find I(BJ1 8F$
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(query, parameter); H*<E5^#dw
} \^y~w~g?
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public PaginationSupport findPageByCriteria sxF2ku4A
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(final DetachedCriteria detachedCriteria){ 0$Mxu7 /
return findPageByCriteria Sb2_&5
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); /[>_Ry,
} NkGtZ.!pk
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public PaginationSupport findPageByCriteria SFuSM/Pf
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(final DetachedCriteria detachedCriteria, finalint b g0ix"
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startIndex){ O z(=%oS
return findPageByCriteria m !<FlEkN
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(detachedCriteria, PaginationSupport.PAGESIZE, 'NjeF6
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startIndex); ~0-)S@
} pl,XS6mB
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public PaginationSupport findPageByCriteria @Q ~;@M
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(final DetachedCriteria detachedCriteria, finalint X[<#B5
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pageSize,
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finalint startIndex){ d<OdQvW.
return(PaginationSupport) OC,yL Q
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getHibernateTemplate().execute(new HibernateCallback(){ e"sv_$*
publicObject doInHibernate #;8VBbc\^
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(Session session)throws HibernateException { oo]P}ra
Criteria criteria = GYf{~J
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detachedCriteria.getExecutableCriteria(session); PK&&Vu2M
int totalCount = NzhWGr_x'
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((Integer) criteria.setProjection(Projections.rowCount q%A>q;l:
UL~~J[1r
()).uniqueResult()).intValue(); HXdo:#xEO
criteria.setProjection /u]#dX5
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(null); 8VG~n?y
List items = ~LFM,@
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criteria.setFirstResult(startIndex).setMaxResults 5HbJE'
8?<J,zu@AV
(pageSize).list(); zJ1M$U
PaginationSupport ps = I}y6ke!
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new PaginationSupport(items, totalCount, pageSize, XD!}uDZ^
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startIndex); 7}c[GC)F
return ps; r0&LjH&R
} (C`nBiL<
}, true); %t9Kc9u3p
} cyjgi /Z
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public List findAllByCriteria(final SZtSUt(ss
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DetachedCriteria detachedCriteria){ D"fjk1
return(List) getHibernateTemplate k{Y\YG%b
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().execute(new HibernateCallback(){ @#o7U
publicObject doInHibernate n@C#,v#^0
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(Session session)throws HibernateException { -s0J8b
Criteria criteria = /
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@LU[po1I
detachedCriteria.getExecutableCriteria(session); ~Lu,jLKL=[
return criteria.list(); e+2lus,u6t
} ~<Wa$~oY
}, true); +Ezl.O@z
} I%j]p Y4
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public int getCountByCriteria(final -biw{
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DetachedCriteria detachedCriteria){ _m#TL60m
Integer count = (Integer) L5&,sJz
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getHibernateTemplate().execute(new HibernateCallback(){ .OW5R*
publicObject doInHibernate %.uN|o&n
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(Session session)throws HibernateException {
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Criteria criteria = Xpkj44cd@
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detachedCriteria.getExecutableCriteria(session); ~7\`qH
return )kKeA
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criteria.setProjection(Projections.rowCount 9]{Ss$W3x
t[ b(erO'
()).uniqueResult(); B(-F|q\
} ~g~`,:Qc
}, true); 0r&FH$
return count.intValue(); q7rX4-G$
} -/7@ A
} \IR$~
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用户在web层构造查询条件detachedCriteria,和可选的 eo"XHP7ja
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 OXoEA a
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PaginationSupport的实例ps。 !) d
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ps.getItems()得到已分页好的结果集 G%%F6)W
ps.getIndexes()得到分页索引的数组 ,zBc-Cm
ps.getTotalCount()得到总结果数 d _=44( -
ps.getStartIndex()当前分页索引 9<Th: t|w
ps.getNextIndex()下一页索引 Y$3liDeL=
ps.getPreviousIndex()上一页索引 " M&zW&
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 <2+FE/3L
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 P\
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一下代码重构了。 &v r0{]V^
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我把原本我的做法也提供出来供大家讨论吧: `zcpaE.@
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首先,为了实现分页查询,我封装了一个Page类: W5RZsS]
java代码: -dUXd<=ue
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/*Created on 2005-4-14*/ <,nd]a
package org.flyware.util.page; 7^h*rL9
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/** .ityudT<
* @author Joa &gvX<X4e
* *>j4tA{b@v
*/ TrHUM4
publicclass Page { @ v}M\$N?
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/** imply if the page has previous page */ .lppT)P
privateboolean hasPrePage; JG'&anbm
d8f S79
/** imply if the page has next page */ 4wwRNu*
privateboolean hasNextPage; ?vP}#N!=d
e(-Vp7vXG
/** the number of every page */ 4f,%@s)zn
privateint everyPage; }e,*'mCC*
9kU|?JE
/** the total page number */ js=w!q0)9
privateint totalPage; ns8I_H
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/** the number of current page */ [-Mfgw]i
privateint currentPage; oVnHbvP1X
d[KG0E5`
/** the begin index of the records by the current [i N}W5
m
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query */ `"E<%$|ZQy
privateint beginIndex; xTdh/}
, @6_sl
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/** The default constructor */ J,wpY$93
public Page(){ ()@+QE$
zDA;FKZPp
} ,W;2A0A?X
/=:X,^"P
/** construct the page by everyPage c<g{&YJ
* @param everyPage j}DG +M
* */ p4wXsOQ}
public Page(int everyPage){ 5A"OL6ty
this.everyPage = everyPage;
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} & Pzr)W(
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/** The whole constructor */ ;z^C\=om
public Page(boolean hasPrePage, boolean hasNextPage, Ha/-v?E
r;&rc:?A
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int everyPage, int totalPage, UR.l*+<W7
int currentPage, int beginIndex){ e@crM'R7Lo
this.hasPrePage = hasPrePage; >I.X]<jI
this.hasNextPage = hasNextPage; =wX(a
this.everyPage = everyPage; HA(G q
this.totalPage = totalPage; mmgIV&P
this.currentPage = currentPage; Gcu?xG{
this.beginIndex = beginIndex; 1'[_J
} tdB<
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/** ]W 6!Xw)[
* @return }Z}4_/E
* Returns the beginIndex. |B.tBt^
*/ '>5W`lZ
publicint getBeginIndex(){ $[8GFv
return beginIndex; =P<7tsSuoK
} &p#.m"Oon
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/** Q>emyij
* @param beginIndex ibskce{H
* The beginIndex to set. 6N'v`p8
*/ N!:&Xz
publicvoid setBeginIndex(int beginIndex){ |\/Y<_)JD
this.beginIndex = beginIndex; ~!a~ -:#
} F2RU7o'f.
|cCrLa2*-
/** Aaq!i*y
* @return 0SLS;s.GX
* Returns the currentPage. P mgTTI
*/ sKI{AHJ?X
publicint getCurrentPage(){ rXlJW]i
return currentPage; WfE,U=e*
} I='S).
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/** zDO`w0N
* @param currentPage Wr Nm:N
* The currentPage to set. YYUWBnf30G
*/ V8.o}BWY
publicvoid setCurrentPage(int currentPage){ 8(c,b
this.currentPage = currentPage; Mm+kG'Z!S
} VdV18-ea
>|22%YVX
/** UFy"hJchO
* @return eE/E#W8
* Returns the everyPage. c31k%/.
*/ m#a0HH
publicint getEveryPage(){ z tLP {q#
return everyPage; 4=E9$.3a
} SiyZq"
'XHKhpm<
/** UfnjhHu
* @param everyPage J2W: Q
* The everyPage to set. R4Vi*H
*/ {m/h3hjFa
publicvoid setEveryPage(int everyPage){ ]N+(SU
this.everyPage = everyPage; WM_wkvYl
} LD~/*
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/** jKI0d+U
* @return B2PjS1z2
* Returns the hasNextPage. HG/`5$L
+}
*/ ErNL^Se1
publicboolean getHasNextPage(){ |i7j}i
return hasNextPage; b xT|
} IP E2t
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/** A[@xTqs{{
* @param hasNextPage ir%?J&C+t
* The hasNextPage to set. tGcp48R-:+
*/ MwN.Ll
publicvoid setHasNextPage(boolean hasNextPage){ 1\_S1ZS
this.hasNextPage = hasNextPage; 5P'<X p
} ~a^"VQ5]ac
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/** * 0GR
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* @return VYb6#sl
* Returns the hasPrePage. -_@3!X1~i+
*/ Q$NT>d6Q
publicboolean getHasPrePage(){ INFbj8T
return hasPrePage; O]SjShp
} `is."]%f
!z7j.u`Y
/** e==}qQ
* @param hasPrePage '<.@a"DnJ
* The hasPrePage to set. YM*{^BXp
*/ 1I*b7t
publicvoid setHasPrePage(boolean hasPrePage){ WxB}Uh
this.hasPrePage = hasPrePage; fP>*EDn@xg
} H +O7+=&
DRC2U%[
/** jW^@lH
EU
* @return Returns the totalPage. ]\y:AkxhJ
* b'Scoa7@'
*/ u&HLdSHe
publicint getTotalPage(){ 2`XG"[@
return totalPage; s3sAw~++
} u/5^N^@^
b42"Y,sbB
/** [/B$cH
* @param totalPage df=G}M(
* The totalPage to set. 'w^Md
*/ Hp2ysU
publicvoid setTotalPage(int totalPage){ "Cz8nG
this.totalPage = totalPage; ~@=*JzP?
} &jh'B ,
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} Cx.GEY|0
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biJ"@dm
4
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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 +=v6*%y"V
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个PageUtil,负责对Page对象进行构造: .</`#
java代码: w%(Ats
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/*Created on 2005-4-14*/ 2UPqn#.3
package org.flyware.util.page; 6 XZF8W
nU{}R"|
import org.apache.commons.logging.Log; FwB}@)3
import org.apache.commons.logging.LogFactory; <6_RWtU
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/** TC7Rw}jF
* @author Joa 21b
* K+=cNC4B
*/ MlDWK_y_&
publicclass PageUtil { hmfO\gc}y
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privatestaticfinal Log logger = LogFactory.getLog ~(( '1+
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(PageUtil.class); _O76Aw-@l
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/** n-/{H4\
* Use the origin page to create a new page Y7TW_[_u
* @param page ^EK]z8;|
* @param totalRecords k
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* @return Sn(e@|!G
*/ ;}iV`)S
publicstatic Page createPage(Page page, int '&XL|_Iq
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totalRecords){ Y8c#"vm(
return createPage(page.getEveryPage(), WInfn f+'
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page.getCurrentPage(), totalRecords); Y[=X b
} 8F?6Aq1B
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/** l[Hgh,
* the basic page utils not including exception `eD70h`XK
T d E.e(
handler gj(|#n5C
* @param everyPage Fx6c*KNX3
* @param currentPage =l7@YCj5c
* @param totalRecords - '<K_e;
* @return page cym<uh-Wg^
*/ cPFs K*w
publicstatic Page createPage(int everyPage, int fl8~*\;Xu
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currentPage, int totalRecords){ 4 f)B@A-
everyPage = getEveryPage(everyPage); P!c.!8C$
currentPage = getCurrentPage(currentPage); ]LcCom:]
int beginIndex = getBeginIndex(everyPage, wZ&l6J4L
WOw( -
currentPage); )Z.v fc
int totalPage = getTotalPage(everyPage, 3sh}(
4^3}+cJ7j
totalRecords); 8dgi"/[3
boolean hasNextPage = hasNextPage(currentPage, : eL{&&