Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 MD)"r>k
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *J=ol
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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 H-W)Tq_?-
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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 6Ts`5$e
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分页支持类:
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java代码: {+:XVT_+
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package com.javaeye.common.util; ar|[D7Xrq\
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import java.util.List; dWy1=UQfP
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publicclass PaginationSupport { L'Zud,JKg
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publicfinalstaticint PAGESIZE = 30; ^j %UZ
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privateint pageSize = PAGESIZE; E2IV R]C2^
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privateList items; -#6*T,f0P(
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privateint totalCount; 7
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privateint[] indexes = newint[0]; W<VHv"?V
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privateint startIndex = 0; B6\VxSX4{
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public PaginationSupport(List items, int ]Qr8 wa>Z
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totalCount){ LDeVNVM
setPageSize(PAGESIZE); \T9UbkR
setTotalCount(totalCount); \<B6>
setItems(items); WZ&@
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setStartIndex(0); L@r.R_*H?s
} H>f{3S-%
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public PaginationSupport(List items, int hhAC@EGG
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totalCount, int startIndex){ rj~ian
setPageSize(PAGESIZE); Mqp68%
setTotalCount(totalCount); (dF;Gcw+
setItems(items); ;;!{m(;LS}
setStartIndex(startIndex); :, [!8QP
} #ya|{K
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public PaginationSupport(List items, int I%919
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totalCount, int pageSize, int startIndex){ \STvBI?
setPageSize(pageSize); Qu FCc1Q
setTotalCount(totalCount); X.l"f'`l
setItems(items); f+Me dc~
setStartIndex(startIndex); W;dzLgc
} 2gAdZE&Y
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publicList getItems(){ ~#_$?_/(
return items; lMez!qx,=
} N>%KV8>{L
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publicvoid setItems(List items){ g/Jj]X#r
this.items = items; cGta4;
} $L8s/1up
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publicint getPageSize(){ "!6~*!]c
return pageSize; 8M+F!1-#
} xKST-:c +
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publicvoid setPageSize(int pageSize){ 14 'x-w^~k
this.pageSize = pageSize; up3<=u{>
} ysJhP .
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publicint getTotalCount(){ ' 5 qL
return totalCount; ({kGK0
} S aet";pf`
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publicvoid setTotalCount(int totalCount){ >ha Ixs`9
if(totalCount > 0){ zMzf=~
this.totalCount = totalCount; b%f2"e0g
int count = totalCount / OXX(OCG>
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pageSize; a~>0JmM+N
if(totalCount % pageSize > 0) LY!3u0PnlT
count++; ;
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indexes = newint[count]; ,
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for(int i = 0; i < count; i++){ GVc[p\h(
indexes = pageSize * /\uH[[s
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i; n[:AV
} k=~pA iRDN
}else{ :G=1$gb
this.totalCount = 0; gc:p@<
} Y1_6\zpA
} lPQ
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publicint[] getIndexes(){ .y_bV=
return indexes; \3(|c#c
} UH,4b`b
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publicvoid setIndexes(int[] indexes){ ePIiF_X
this.indexes = indexes; a#T]*(Yq)
} vFEQ7qI
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publicint getStartIndex(){ %v2R.?F8
return startIndex; Z4IgBn(Z_}
} HYmn:?H
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publicvoid setStartIndex(int startIndex){ Ali9pvE
if(totalCount <= 0) svXR<7)#
this.startIndex = 0; k%^lF?_0I
elseif(startIndex >= totalCount) WOh|U4vt
this.startIndex = indexes =_0UD{"_0
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[indexes.length - 1]; 9(":,M(/o
elseif(startIndex < 0) E@Ad'_H
this.startIndex = 0; 41SGWAd#:
else{ z5TuGYb<
this.startIndex = indexes |^@dFOz
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[startIndex / pageSize]; *-xU2
} "?mJqA
} aN(|'uO@
@gG<le6
publicint getNextIndex(){ 6]-SK$
int nextIndex = getStartIndex() + jbR0%X2
} CfqG?)
pageSize; [k-+AA>:
if(nextIndex >= totalCount) FN[{s
return getStartIndex(); EAeqLtFqs
else qpXWi
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return nextIndex; ;V<fB/S.=+
} Gm\/Y:U
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publicint getPreviousIndex(){ >a}f{\Q
int previousIndex = getStartIndex() - GaSPJt
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pageSize; ~}<DG1!
if(previousIndex < 0) yBI'djL~>
return0; 5YrBW:_OI
else %RDI!e<e}
return previousIndex; jRL<JZ1N
} 2,*M|+W~
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} '}$Dgp6e
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抽象业务类 ^_m9KA
java代码: v;)..X30
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/** Z4\=*ic@
* Created on 2005-7-12 G.UI|r/Kz
*/ LGtIm7
package com.javaeye.common.business; qT^I?g"!
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import java.io.Serializable; zE_i*c"`
import java.util.List; 0L/n ?bf
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import org.hibernate.Criteria; B
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import org.hibernate.HibernateException; }I>tO9M
import org.hibernate.Session; \P6$mh\T
import org.hibernate.criterion.DetachedCriteria; d m`E!R_
import org.hibernate.criterion.Projections; G
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import Nal9M[]c
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org.springframework.orm.hibernate3.HibernateCallback; GI1
import p }~qf
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org.springframework.orm.hibernate3.support.HibernateDaoS Pjc
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upport; [D4Es
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import com.javaeye.common.util.PaginationSupport; sL$:"=
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public abstract class AbstractManager extends a5TioQ
@
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HibernateDaoSupport { \vO,Ee~#W
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privateboolean cacheQueries = false; k-^mIJo}
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privateString queryCacheRegion; h3xAJ!
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publicvoid setCacheQueries(boolean W@I|Q -
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cacheQueries){ r<d_[?1N
this.cacheQueries = cacheQueries; Ev}C<zk*
} V:
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publicvoid setQueryCacheRegion(String Jh!I:;/
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queryCacheRegion){ ",KCCis
this.queryCacheRegion = 1 P!Yxeh
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queryCacheRegion; !*B'?|a<\
} gq'Y!BBQy
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publicvoid save(finalObject entity){ >E{";C)
getHibernateTemplate().save(entity); >]vlkA(
} -^hWM}F
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publicvoid persist(finalObject entity){ 3!|;iJRH
getHibernateTemplate().save(entity); t^G"f;Ra+
} ]Hefm?9*^
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publicvoid update(finalObject entity){ U"^kH|
getHibernateTemplate().update(entity); kr9*,E9cv
} Ni-xx9)=
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publicvoid delete(finalObject entity){ 67G?K;)e
getHibernateTemplate().delete(entity); sg3OL/"
} |8l<$J
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publicObject load(finalClass entity, 7>))D'l57
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finalSerializable id){ BMG3|N^
return getHibernateTemplate().load 87
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(entity, id); AicBSqUke
} Y4`}y-'d
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publicObject get(finalClass entity, "8x8UgG
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finalSerializable id){ $!-c-0ub
return getHibernateTemplate().get 2a`o
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(entity, id); v4`"1Ss,K
} ;Q OBBF3HG
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publicList findAll(finalClass entity){ T?tgdJ
return getHibernateTemplate().find("from !Sh&3uy_qN
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" + entity.getName()); j7$e28|_n
} YQ9'0F[l
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publicList findByNamedQuery(finalString 93("oBd[s(
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namedQuery){ ao1(]64X"
return getHibernateTemplate ' g=
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().findByNamedQuery(namedQuery);
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} ~J wb`g.
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publicList findByNamedQuery(finalString query, cl=EA6P\X
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finalObject parameter){ P;=n9hgHI
return getHibernateTemplate m? J0i>H
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().findByNamedQuery(query, parameter); :dl]h&C^
} X0bN3N
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publicList findByNamedQuery(finalString query, m ZtCL
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finalObject[] parameters){ Xx."$l
return getHibernateTemplate 8uc1iB
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().findByNamedQuery(query, parameters); TJ_$vI
} WejYy|
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publicList find(finalString query){ \HxT@UQ)~
return getHibernateTemplate().find n7B7 m,@1
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(query); @Owb?(6?
} 'y;EhOwj,
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publicList find(finalString query, finalObject 4IB9,?p
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parameter){ .0S~872
return getHibernateTemplate().find q@QksAq
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(query, parameter); >:A ARx%
} 1L%CJ+Q#0i
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public PaginationSupport findPageByCriteria wa<MRt W=
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(final DetachedCriteria detachedCriteria){ oX#Q<2z*
return findPageByCriteria 63q^ $I
q}`${3qQ3
(detachedCriteria, PaginationSupport.PAGESIZE, 0); O,+1<.;+
} ;,C)!c&
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public PaginationSupport findPageByCriteria prC;L*~8
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(final DetachedCriteria detachedCriteria, finalint _(_a*ml
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startIndex){ 6LOnU~l,
return findPageByCriteria !*s?B L
dbwe?ksh
(detachedCriteria, PaginationSupport.PAGESIZE, -E^vLB)O
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startIndex); +DW~BS3
} #+:9T/*>0
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public PaginationSupport findPageByCriteria lW+\j3?Z$
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(final DetachedCriteria detachedCriteria, finalint v0
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pageSize, ~x A-V4.
finalint startIndex){ <>dT64R|
return(PaginationSupport) -|J"s$yO4
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getHibernateTemplate().execute(new HibernateCallback(){ G<At_YS
publicObject doInHibernate @E;=*9ek{u
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(Session session)throws HibernateException { &R[ Mc-2
Criteria criteria = 4~k\j
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detachedCriteria.getExecutableCriteria(session); -9%:ilX~
int totalCount = OglEt[ "
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((Integer) criteria.setProjection(Projections.rowCount Q;[,Q~c[u
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e}
()).uniqueResult()).intValue(); 8J=?5
criteria.setProjection {%<OD8>p
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(null); 7R`M,u~f2^
List items = s:OFVlC%\
f* !j[U/r_
criteria.setFirstResult(startIndex).setMaxResults _76PIR{an
#Vl 0.l3
(pageSize).list(); EqyeJq .
PaginationSupport ps = ZO!I.
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new PaginationSupport(items, totalCount, pageSize, |
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startIndex); D!Q">6_"z
return ps; o4`hY/<t
} P<PJ)>
}, true); bBu,#Mc
} {G|,\O1
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public List findAllByCriteria(final D;oe2E{I
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DetachedCriteria detachedCriteria){ K\>tA)IPSV
return(List) getHibernateTemplate 8MK>)P o)
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().execute(new HibernateCallback(){ _.>QEh5"5
publicObject doInHibernate _9faBrzd
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(Session session)throws HibernateException { CEXyrs<
Criteria criteria = /,1D)0
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detachedCriteria.getExecutableCriteria(session); z3`-plE
return criteria.list(); h"Xg;(K
} y#>,+a#5
}, true); VOKZ dC-
} ^:K3vC[h;c
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public int getCountByCriteria(final 0T@ Zb={
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DetachedCriteria detachedCriteria){ UUSq$~Ct
Integer count = (Integer) K2he4<
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getHibernateTemplate().execute(new HibernateCallback(){ -c(F 1l
publicObject doInHibernate k xP-,MD
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(Session session)throws HibernateException { if}-_E<F
Criteria criteria = f_[<L
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detachedCriteria.getExecutableCriteria(session); z|=}1;(.
return =3|O%\
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criteria.setProjection(Projections.rowCount >G);j@Q
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()).uniqueResult(); &@%W29:
} Tg!i%v(-t
}, true); *j]9vktH
return count.intValue(); 6^uq?
} +cIUGFp}
} D-8O+.@
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用户在web层构造查询条件detachedCriteria,和可选的 cU0s
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 (EK"V';
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PaginationSupport的实例ps。 T;@;R%
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ps.getItems()得到已分页好的结果集 *\=.<|H Z
ps.getIndexes()得到分页索引的数组 XD |E=s
ps.getTotalCount()得到总结果数 ^[]}R:
ps.getStartIndex()当前分页索引 fNb`X
ps.getNextIndex()下一页索引 ~2<7ZtV=
ps.getPreviousIndex()上一页索引 |_o=^?z'
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 7:9.&W/KE
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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 \cC%!4
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一下代码重构了。 {z(xFrY
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我把原本我的做法也提供出来供大家讨论吧: &8%e\W\K:/
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首先,为了实现分页查询,我封装了一个Page类: ~.A)bp
java代码: 1U^A56CN
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/*Created on 2005-4-14*/ 2kdC]|H2?
package org.flyware.util.page; [|P!{?A43|
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/** zunV<2~(2}
* @author Joa vFE;D@bz:
* BZud)l24
*/ ;3\3q1oX
publicclass Page { :T]o)
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/** imply if the page has previous page */ 2>86oP&
privateboolean hasPrePage; )\6&12rj
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/** imply if the page has next page */ #ggf' QIHp
privateboolean hasNextPage; .pfP7weQ
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/** the number of every page */ e=4+$d
privateint everyPage; F%i^XA]a*
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/** the total page number */ slg ]#Dy
privateint totalPage; OfctoPP _0
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/** the number of current page */ dxZu2&gi
privateint currentPage; ({JHZ6uZ
v2H#=E4cZ#
/** the begin index of the records by the current = M]iIWQ@`
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query */ x9x E&
privateint beginIndex; iC W*]U
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/** The default constructor */ &^}6
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public Page(){ .&9 i
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} aX~%5mF
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/** construct the page by everyPage Y`o+XimX
* @param everyPage O~59FuL
* */ dn}` i
public Page(int everyPage){ d'/TdVM
this.everyPage = everyPage; \0mb
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} %H]lGN)
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/** The whole constructor */ }|5VRJA
public Page(boolean hasPrePage, boolean hasNextPage, /[ 6j)HIS
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int everyPage, int totalPage, ithewup
int currentPage, int beginIndex){ 8E4mA5@
this.hasPrePage = hasPrePage; _UT$,0u_i
this.hasNextPage = hasNextPage; 4#5:~M }
this.everyPage = everyPage; NvHJ3> "%
this.totalPage = totalPage; - !>}_AH
this.currentPage = currentPage; TYlbU<
this.beginIndex = beginIndex; Q}!mx7b0]
} zfwS
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/** 549jWG
* @return ,oNOC3U
* Returns the beginIndex. RPIyO
*/ ZxlAk+<]
publicint getBeginIndex(){ !<UJ6t}
return beginIndex; vk>b#%1{
} <`jLY)sw
@&]#uRl|[
/** 0]D{Va
* @param beginIndex wtT}V=_
* The beginIndex to set. LY[~Os W
*/ 8[|UgI,>z
publicvoid setBeginIndex(int beginIndex){ h.!}3\Y
this.beginIndex = beginIndex; DhX#E&
} >@YtDl8R
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/** /s-A?lw^2
* @return mo1oyQg8
* Returns the currentPage. RN)dS>$
*/ ?-tVSRKQ
publicint getCurrentPage(){ TZtjbD>B
return currentPage; T]j.=|,d
} dJv!Dts')C
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/** <BO)E(
* @param currentPage {CR 5K9
* The currentPage to set. oW^*l#v
*/ a6:x"Tv
publicvoid setCurrentPage(int currentPage){ wHIj<"2
this.currentPage = currentPage; >XOiu#kC
} gPu2G/Y
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/** ~>0qZ{3J_
* @return (_4;') 9
* Returns the everyPage. $!5\E>y#
*/ *xE,sj+(
publicint getEveryPage(){ ~+<olss_
return everyPage; {QbvR*gv
} peJKNX.!q
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/** ,-+"^>
* @param everyPage lCF`*DM#
* The everyPage to set. 2"fO6!hh
*/ ~2d:Q6
publicvoid setEveryPage(int everyPage){ Fkf97Oi
this.everyPage = everyPage; q~L^au8
} A:y.s;<L0
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/** ?0_7?yTR/
* @return @\w,otT
* Returns the hasNextPage. #{9G sD
*/ AF43$6KZP$
publicboolean getHasNextPage(){ ~^^ NHq
return hasNextPage; 7O`o ovW$
} |0{u->+ )
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/** h;V,n
* @param hasNextPage 8F)G7
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* The hasNextPage to set. mp~{W
*/ dr{y0`CCN
publicvoid setHasNextPage(boolean hasNextPage){ ES<{4<Kpx
this.hasNextPage = hasNextPage; okq[ o90
} O:#+%
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/** Pv<FLo%u<
* @return V@d)?T
* Returns the hasPrePage. +Z!;P
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*/ |3K)$.6~
publicboolean getHasPrePage(){ F8e<}v&7R
return hasPrePage; JaWv]@9*
} 19(Dj&x
w(1Gi$Z(Q)
/** kl1Y] ?z}
* @param hasPrePage ha;l(U>
* The hasPrePage to set. 6|J'>)
*/ Sd IX-k.
publicvoid setHasPrePage(boolean hasPrePage){ *QM~O'WhD
this.hasPrePage = hasPrePage; #JA}3]
} iRG?# "
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/** kW6%32
* @return Returns the totalPage. i.iio-
* +Ra3bj l
*/ kqvow3u
publicint getTotalPage(){ ?IX!+>.H
return totalPage; '?o9VrO
} j2h[70fWC
"`A :(<x
/** }8'&r(cN4
* @param totalPage pz_e =xr
* The totalPage to set. BbJkdt7
*/ tJ&5tNl
publicvoid setTotalPage(int totalPage){ &[?CTZ
this.totalPage = totalPage; +rNkN:/L
} ID};<[
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} Mo|wME#M
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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 m4ApHM2
3$M3Q]z
个PageUtil,负责对Page对象进行构造: 4ax|Vb)D
java代码: FQeYx-7
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/*Created on 2005-4-14*/ f1{z~i9@$
package org.flyware.util.page; sLcY,AH
^!:"Q3
import org.apache.commons.logging.Log; ?~ULIO'
import org.apache.commons.logging.LogFactory; Q]JX`HgPaU
#]KgUc5B
/** BQgoVnQo_c
* @author Joa ,axDMMDI
* Z/ bB
h
*/ fu\s`W6f&
publicclass PageUtil { gb-{2p>}
"-i#BjZl/
privatestaticfinal Log logger = LogFactory.getLog X,fu!
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z
(PageUtil.class); 9zKBO* p`
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/** H 30OUrD
* Use the origin page to create a new page ['Z{@9
* @param page z?.(3oLT
* @param totalRecords V7<eQ0;m
* @return delf
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*/ ,-#GX{!
publicstatic Page createPage(Page page, int -Wjh* *
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totalRecords){ o)]FtL:mm
return createPage(page.getEveryPage(), 3o8\/-*<
aw$Y`6,S
page.getCurrentPage(), totalRecords); INNAYQ
} ^Vo"fI`=C
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/** >A jCl
* the basic page utils not including exception QUP|FIpZ
|>utWT]S
handler wGXwzU
* @param everyPage uW[3G
* @param currentPage j@P5(3r
* @param totalRecords '
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* @return page !
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*/ 9) ea.Gu
publicstatic Page createPage(int everyPage, int 84`rbL!M
sv=^k(d3
currentPage, int totalRecords){ w~-X>~ }
everyPage = getEveryPage(everyPage); LZV}U*
currentPage = getCurrentPage(currentPage); h3 @s2 fK
int beginIndex = getBeginIndex(everyPage, ~I$}#
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currentPage);
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int totalPage = getTotalPage(everyPage, pG28M]\
dQ6GhS~
totalRecords); 5;
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boolean hasNextPage = hasNextPage(currentPage, on50+)uN
kIM
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totalPage); K -E`y
boolean hasPrePage = hasPrePage(currentPage); uGCtLA+sL
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returnnew Page(hasPrePage, hasNextPage, B/_6Ieb+
everyPage, totalPage, hho%~^bn(
currentPage, {Q<0\`A
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beginIndex); A\g%
} {rfte'4;=
@\$Keg=>:
privatestaticint getEveryPage(int everyPage){ 85C#ja1&