Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 \3cg\Q+~
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 {ALOs^_-
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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 &fifOF#[e
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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 21\?FQrz
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分页支持类: h>"Z=y
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java代码: Ijs=4f
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package com.javaeye.common.util; A|P
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import java.util.List; #pX +~{
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publicclass PaginationSupport { M,N(be-
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publicfinalstaticint PAGESIZE = 30; v5`Odbc=w
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privateint pageSize = PAGESIZE; A;Uw
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privateList items; 8hvh
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privateint totalCount; ps=QVX)YP
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privateint[] indexes = newint[0]; 7R".$ p
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privateint startIndex = 0; pPZ^T5-ks
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public PaginationSupport(List items, int 8\8%FSrc
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totalCount){ OTwXc*2u]
setPageSize(PAGESIZE); I,!>ZG@6
setTotalCount(totalCount); c#(&\g2H
setItems(items); rDU"l{cg
setStartIndex(0); WFFpW{
} & A @!g
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public PaginationSupport(List items, int .@]M'S^1
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totalCount, int startIndex){ }@wXm
setPageSize(PAGESIZE); DR#[\RzNI
setTotalCount(totalCount); ?8)$N
setItems(items); Z(fhH..T`
setStartIndex(startIndex); 8^dsx1U#
} z50f$!?
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public PaginationSupport(List items, int T 9?!.o
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totalCount, int pageSize, int startIndex){ AkRZUj\
setPageSize(pageSize); _k.gVm
setTotalCount(totalCount); ,=p.Cx'PR
setItems(items); _fANl}Mf:
setStartIndex(startIndex); eE;")t,
} 'k[gxk|d2
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publicList getItems(){ dCM*4B<
return items; L\UM12
} <x2 F5$@
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publicvoid setItems(List items){ &:)e
this.items = items; x+5y287#
} @;@Wt`(2a
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publicint getPageSize(){ SvGs?nUU
return pageSize; )?PRG=
} UQ 'U
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publicvoid setPageSize(int pageSize){ a'ODm6#
this.pageSize = pageSize; XG}pp`{o
} b(H)8#C
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publicint getTotalCount(){ 7?JcB?G4
return totalCount; Dbo.N`
} *d/]-JN,K
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publicvoid setTotalCount(int totalCount){ v;@-bED(Qs
if(totalCount > 0){ `+0)dTA(g$
this.totalCount = totalCount; yLlAK,5P0o
int count = totalCount / h8_~ OX
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pageSize; k)R>5?_
if(totalCount % pageSize > 0) k|}S K9
count++; "A?_)=zZ
indexes = newint[count]; l?%U*~*
for(int i = 0; i < count; i++){ !Rw\k'<GKX
indexes = pageSize * (&u)FB*
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i; K06/ D!RD4
} 8; s$?*Gi
}else{ XOy#?X/`
this.totalCount = 0; 4hv'OEl
} ]& qmV
} %lU$;cY
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publicint[] getIndexes(){ $wn"+wX
return indexes; 4q<:%
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} XJ;JDch
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publicvoid setIndexes(int[] indexes){ D:HeP:.I
this.indexes = indexes; ?iBHJ{
} 2v<[XNX
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publicint getStartIndex(){ _9Ig`?<>I
return startIndex; f(E 'i>
} rXz,<^Hmj
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publicvoid setStartIndex(int startIndex){ 1v&!`^G99j
if(totalCount <= 0) ? I}T[j
this.startIndex = 0; z
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elseif(startIndex >= totalCount) r8M/E
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this.startIndex = indexes $*H>n!&
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[indexes.length - 1]; u[oYVpe)IG
elseif(startIndex < 0) &7X0 ;<
this.startIndex = 0; >:`Y]6z
else{ ASLRP
this.startIndex = indexes jL)aU> kN
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[startIndex / pageSize]; yXw xq(32
} U<NpDjc"
} g5to0
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publicint getNextIndex(){ m-a_<xo
int nextIndex = getStartIndex() + +*
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pageSize; I=^%l7
if(nextIndex >= totalCount)
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return getStartIndex(); ,Fg&<Be}Jx
else @11voD
return nextIndex; ASaG }h
} !U/:!e`N
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publicint getPreviousIndex(){ _ #l b\
int previousIndex = getStartIndex() - );;UNO21+
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pageSize; #
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if(previousIndex < 0) g m],
return0; $zz=>BOk
else .?S#DS )
return previousIndex; sa+:c{
} rsP-?oD8)
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} yZFvpw|g
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抽象业务类 m$hSL4N
java代码: 7!JoP?!
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/** JEBo!9
* Created on 2005-7-12 G68N@g
*/ S_2I8G^A
package com.javaeye.common.business; hY'"^?OP
5'V'~Q%
import java.io.Serializable; eB$v'9S8/
import java.util.List; T*h+"TmE
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import org.hibernate.Criteria; p7H*Ff`
import org.hibernate.HibernateException; PLo.q|%
import org.hibernate.Session; !b _<_Y{l
import org.hibernate.criterion.DetachedCriteria; KS(T%mk\
import org.hibernate.criterion.Projections; D|-]"(2i
import 4
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org.springframework.orm.hibernate3.HibernateCallback; \wDOE(>
import 5-mJj&0:!
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org.springframework.orm.hibernate3.support.HibernateDaoS J;_JHlK
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upport; 6lWO8j^BN
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import com.javaeye.common.util.PaginationSupport; Fx3VQ'%J
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public abstract class AbstractManager extends 4qm5`o\hb
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HibernateDaoSupport { {8B\-LUR
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privateboolean cacheQueries = false; >2g CM
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privateString queryCacheRegion; %] #;
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publicvoid setCacheQueries(boolean 1@nR.v"$
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cacheQueries){ +.lO8
this.cacheQueries = cacheQueries; M $~h(3
} o$-8V:)6d
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publicvoid setQueryCacheRegion(String ;D^)^~7dh
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queryCacheRegion){ IYQYW.`ly
this.queryCacheRegion = dIpt&nH&$
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queryCacheRegion; yZ!Eu#81
} uRL3v01?H0
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publicvoid save(finalObject entity){ %DV@ 2rC<
getHibernateTemplate().save(entity); M5x!84
} x#YOz7.
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publicvoid persist(finalObject entity){ H_AV 3
;
getHibernateTemplate().save(entity); -y\N 9
} ~<Lf@yu-{
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publicvoid update(finalObject entity){ \YKh'|04
getHibernateTemplate().update(entity); _L=vK=,
} hx2C<;s4
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publicvoid delete(finalObject entity){ R_1C+
getHibernateTemplate().delete(entity); HJ'93,
} n5JB'F)
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publicObject load(finalClass entity, I+CQ,Zuf
)R +o8C
finalSerializable id){ <eh(~
return getHibernateTemplate().load u:S@'z>
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(entity, id); 6>L. )V
} w7Pe<vT
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publicObject get(finalClass entity, wU ; f
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finalSerializable id){ |ber:1
return getHibernateTemplate().get 23f[i<4e
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(entity, id); 3N
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} wqwJpWIe
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publicList findAll(finalClass entity){ x<Zhj3
return getHibernateTemplate().find("from 9V66~Bf5
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" + entity.getName()); >#:/
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} YEQW:r_h.S
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publicList findByNamedQuery(finalString 6|KX8\,A@
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namedQuery){ r9M={jC
return getHibernateTemplate da2[
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().findByNamedQuery(namedQuery); w}Upa(dU
} =_'cG:=)
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publicList findByNamedQuery(finalString query, ^c\ IZ5
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finalObject parameter){ SznE:+
return getHibernateTemplate +hg\DqO^M
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().findByNamedQuery(query, parameter); 2*citB{
} X?6h>%) k
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publicList findByNamedQuery(finalString query, eCp| QSXE
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finalObject[] parameters){ s3M84w z
return getHibernateTemplate x
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().findByNamedQuery(query, parameters); |sFe:TX
} |nEVOy>'
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publicList find(finalString query){ M?B(<j1Ri
return getHibernateTemplate().find IMGqJc,7
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(query); Uxemlp%%*
} %;Z bQ9
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publicList find(finalString query, finalObject kP)o=\|W{z
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parameter){ 'Y[A'.*}4
return getHibernateTemplate().find p??/r
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(query, parameter); 16QbB;
} z`/.v&<>V
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public PaginationSupport findPageByCriteria RW7oL:$dt
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(final DetachedCriteria detachedCriteria){ =$8@JF'
return findPageByCriteria [S]!+YBK
d=Do@)
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); cIr1"5POXK
} wz+5
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public PaginationSupport findPageByCriteria +V9B
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(final DetachedCriteria detachedCriteria, finalint dPx<Dz;
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startIndex){ 8}, <e>q
return findPageByCriteria T;4`wB8@
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(detachedCriteria, PaginationSupport.PAGESIZE, 2Nn1-wdhb
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startIndex); +oy&OKCa
} |WAD $3
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public PaginationSupport findPageByCriteria Blbq3y+Sq
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(final DetachedCriteria detachedCriteria, finalint -2&i)S0R
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pageSize, 3fxNV<
finalint startIndex){ _E6}XNS
return(PaginationSupport) o}=.
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getHibernateTemplate().execute(new HibernateCallback(){ sc8DY!|OYN
publicObject doInHibernate CofH}-
ns#~}2"d
(Session session)throws HibernateException { _Dj<Eu_
Criteria criteria = 23-t$y]
h/Hl?O8[
detachedCriteria.getExecutableCriteria(session); D;zWksq
int totalCount = 5!AV!A_Jp
d;~ 3P
((Integer) criteria.setProjection(Projections.rowCount =dM.7$6) R
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()).uniqueResult()).intValue(); *AH^%!kVP
criteria.setProjection [8@kx Cq
i
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(null); GVG!sMmnX
List items = 8PBU~mr
r!$'!lCR
criteria.setFirstResult(startIndex).setMaxResults 9k:W1wgH1
/zG+]
(pageSize).list(); gcg>Gjp
PaginationSupport ps = i_u
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new PaginationSupport(items, totalCount, pageSize, 1n'$Ji7
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startIndex); {y-2
return ps; 1TNz&=e
} tqf&N0*
}, true); 0||"r&:X
}
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public List findAllByCriteria(final _1sMY hI
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DetachedCriteria detachedCriteria){ 'j,oIqx
return(List) getHibernateTemplate +2DE/wE]e+
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().execute(new HibernateCallback(){ j1YH9T#|D
publicObject doInHibernate a@#Q:O)4
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(Session session)throws HibernateException { fxDj+Q1p
Criteria criteria = 8xF)_UV
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detachedCriteria.getExecutableCriteria(session); F aFp_P?
return criteria.list(); ~uI**{
} {'h_'Y`bOQ
}, true); ;1W6"3t-Y
} $Z;B QJVH
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public int getCountByCriteria(final \=!H 2M
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DetachedCriteria detachedCriteria){ )O3jQ_q=
Integer count = (Integer) QjA&IZEC
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getHibernateTemplate().execute(new HibernateCallback(){ 4:vTxNs&S
publicObject doInHibernate z)lM2x>|*
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(Session session)throws HibernateException { HU &)
Criteria criteria = HG2GZ}~^1
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detachedCriteria.getExecutableCriteria(session); _Vjpw,
return GQN98Y+h
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criteria.setProjection(Projections.rowCount XRa(sXA3
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()).uniqueResult(); 4\M8BRuE
} }[ ].\G\G
}, true); !?nu?
return count.intValue(); g96T*T
} :peqr!I+K
} naz:A
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用户在web层构造查询条件detachedCriteria,和可选的 TPHYz>D]
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 {Eu'v$c!
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PaginationSupport的实例ps。 {XtoiI
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ps.getItems()得到已分页好的结果集 Xo Y7/&&
ps.getIndexes()得到分页索引的数组 @,k7xm$u
ps.getTotalCount()得到总结果数 nfX12y_SXL
ps.getStartIndex()当前分页索引 2"@Ft()]
ps.getNextIndex()下一页索引 IAI(Ix
ps.getPreviousIndex()上一页索引 Ikj=`,a2B
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 @l~7x
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 exQ#<x*
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一下代码重构了。 O)uOUB
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我把原本我的做法也提供出来供大家讨论吧: x=-0 zV
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首先,为了实现分页查询,我封装了一个Page类: vX+.e1m
java代码: qD-fw-,:
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Seda }
/*Created on 2005-4-14*/ Uky9zGa
package org.flyware.util.page; uEx9-,!
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/** !\;:36B#6
* @author Joa T C8`JU=wV
* R\5Vq$Q
*/ "Sjr_!u
publicclass Page { )11W)G`w
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/** imply if the page has previous page */ 6NX3"i0eT
privateboolean hasPrePage; E-fr}R}
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/** imply if the page has next page */ z(me@P!D~
privateboolean hasNextPage; >)Gd:636+
+`.,| |Mq
/** the number of every page */ Q[PK`*2)
privateint everyPage; -[DWM2C$K4
@2
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/** the total page number */ \9)#l#m
privateint totalPage; 9#k0_vDoW
p@ygne4
/** the number of current page */ ?x3Jv<G0*
privateint currentPage; :.uk$jx
J02^i5l
/** the begin index of the records by the current #.ct5
} ptMjT{9
query */ `~h4D(n`
privateint beginIndex; k_aW
DM),|Nq"
c?K~/bx.
/** The default constructor */ 40#9]=;}
public Page(){ LA4<#KP
;`(R7X
*3
} MBw-*K'?zB
CPviR<ms_
/** construct the page by everyPage cin2>3Z$
* @param everyPage |g-b8+.=]
* */ e1/sqXWo
public Page(int everyPage){ n ~,tQV
this.everyPage = everyPage; ^Ga&}-
} %=Tr^{i
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/** The whole constructor */ 1 ] #9
public Page(boolean hasPrePage, boolean hasNextPage, 2)
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p[v#EyoC
int everyPage, int totalPage, 9(, @aZ
int currentPage, int beginIndex){ \+nGOvM
this.hasPrePage = hasPrePage; 3`F) AWzdr
this.hasNextPage = hasNextPage; =Z,5$6%)
this.everyPage = everyPage; M#,Q
^rH#
this.totalPage = totalPage; g"hJ{{<
this.currentPage = currentPage; vl:J40Kfn
this.beginIndex = beginIndex; s8<gK.atl
} 4w$_]ke
,gx)w^WTm
/** 3[IJhR[
* @return #0"~G][#
* Returns the beginIndex. +(?>-3_z
*/ U \oy8FZ
publicint getBeginIndex(){ #X`8dnQZ
return beginIndex; K84^Oq
} ^G|98yc!'
7J*N_8?2
/** PmX2[7
* @param beginIndex >v+jh(^
* The beginIndex to set. 2/7_;_#vJ%
*/ {1-V]h.<J
publicvoid setBeginIndex(int beginIndex){ ^G1%6\We
this.beginIndex = beginIndex; 3
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} cYNV\b4-
)9v`f9X){
/** ~DF:lqwWP
* @return },@^0UH4c
* Returns the currentPage. aM=D84@
*/ \3XqHf3|o
publicint getCurrentPage(){ J
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return currentPage; .12aUXo(
} uJU*")\V
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/** Uh6 '$0
* @param currentPage d_z59
* The currentPage to set. EbY,N:LK
*/ w#y0atsg'
publicvoid setCurrentPage(int currentPage){ mpw~hW0-
this.currentPage = currentPage; ZWUP^V
} 3gZ8.8q3
3_$w|ET
/** f3MRD4+-
* @return &&>tf%[
* Returns the everyPage. 0(TTw(;
*/
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publicint getEveryPage(){ p#P~Q/;
return everyPage; |N /G'>TS
} BU Z
_)
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/** L1{GL #qV
* @param everyPage g"VMeW^
* The everyPage to set. dl-l"9~;
*/ b7`D|7D
publicvoid setEveryPage(int everyPage){ o{:xp r=(
this.everyPage = everyPage; .Pndx%X9s
} YIRZ+H<Q
\nNXxTxX!
/** A7_4.VH
* @return n/d`qS
* Returns the hasNextPage. "/Pjjb:2
*/ =T?}Nt
publicboolean getHasNextPage(){ :M3oUE{
return hasNextPage; thlY0XCq,%
} ||7x;2e
LW6ZAETyL
/** y9H%
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* @param hasNextPage <xpph
t<
* The hasNextPage to set. _gj&$zP
*/ ;*TIM%6#
publicvoid setHasNextPage(boolean hasNextPage){ S[3iA~)Z-
this.hasNextPage = hasNextPage; XN=67f$Hw
} &)wiKh"$
I=)hWC/
/** 2&mGT&HAVA
* @return 6RO(]5wX
* Returns the hasPrePage. C$h<Wt=<
*/ yOU(2"8p
publicboolean getHasPrePage(){ |077Sf|
return hasPrePage; 3rW|kkn
} 'NjzgZ~]P
7,qYV}
/** :$;Fhf<5
* @param hasPrePage C@ZK~Y_g
* The hasPrePage to set. 96cJ8I8
*/ {6;9b-a]
publicvoid setHasPrePage(boolean hasPrePage){ `_I@i]i^
this.hasPrePage = hasPrePage; QfM zF
} OVzt\V*+%W
e~%
;K4
/** Pt:e!qX)
* @return Returns the totalPage. M-L2w"
* rEhX/(n#
*/ Xaz o9J
publicint getTotalPage(){ ok^d@zI
return totalPage; =uk0@hy9b
} NL=|z=q
C
(n+SY^
/** J?@DGp+t
* @param totalPage _/8FRkx
* The totalPage to set. :bV mgLgG
*/ EF7+ *Q9
publicvoid setTotalPage(int totalPage){ S1Z2_V
this.totalPage = totalPage; kE>0M9EdH
} o./.Q9e7
~LJY6A@y
} :P,sxDlG)
O<PO^pi
6vuq1
[Aj Q#;#Q
sQ6}\
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 <~}7Mxn%x@
M#"524Nz
个PageUtil,负责对Page对象进行构造: 4a0:2 kIKa
java代码: gTgMqvt
F>tQn4
h5%<+D<
/*Created on 2005-4-14*/ (Fq5IGs
package org.flyware.util.page; O ,rwP
+a&p$\
import org.apache.commons.logging.Log; <DKS+R
import org.apache.commons.logging.LogFactory; m }a|FS
Y$N)^=7
/** IEKU-k7}Z
* @author Joa !TZhQiorC
* s+Fi @lg,
*/ iHwLZ[O{
publicclass PageUtil { UNijFGi
[Vd[-
privatestaticfinal Log logger = LogFactory.getLog *D o/+[Ae
ur
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(PageUtil.class); ?88[|;b3
l Z#o+d2Y
/** lzw3= H
* Use the origin page to create a new page ,NnhHb2\
* @param page rG#Z=*b%
* @param totalRecords /? r?it
* @return >AoK/(yL.
*/ <VD8bTk
publicstatic Page createPage(Page page, int ;^*Unyt[4]
F'g Vzf
totalRecords){ ]k9)G*
return createPage(page.getEveryPage(), mNmLyU=d
k(zsm"<q
page.getCurrentPage(), totalRecords); ?9l [y
} $0bjKy
6KD `oUx
/** D9`0Dr}/2
* the basic page utils not including exception ;Yi4Xva@
)jq?lw'&
handler V"p!Bf
* @param everyPage 1;Pv0&[q/
* @param currentPage
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* @param totalRecords [M.f-x:
* @return page k>t)g-,2
*/ "ZTTg>r
publicstatic Page createPage(int everyPage, int .(pN5JI*
b-3*Nl _%
currentPage, int totalRecords){ TKk-;Y=N
everyPage = getEveryPage(everyPage); qwIa?!8o
currentPage = getCurrentPage(currentPage); 4iW'kuK
int beginIndex = getBeginIndex(everyPage, D:Q
21Ch
J_>w 3uY
currentPage); SIbDj[s
int totalPage = getTotalPage(everyPage, ?Ma~^0
ypJ".
totalRecords); p>_;^&>&
boolean hasNextPage = hasNextPage(currentPage, Vy_2 .
JG9` h#
totalPage); m*$|GW9
boolean hasPrePage = hasPrePage(currentPage); ]f]<4HD=i
8/0Y vh
returnnew Page(hasPrePage, hasNextPage, *3T|M@Y
everyPage, totalPage, 3Tn)Z1o
currentPage, 5 H#W[^s"
\rVQQ|l
beginIndex); 7'
S @3
} =)hVn
(`? y2n)~W
privatestaticint getEveryPage(int everyPage){ /y^7p9Z`
return everyPage == 0 ? 10 : everyPage; F:6SPY
y
} =]-j;#'&
6a;v&5
privatestaticint getCurrentPage(int currentPage){ nFe%vu8a
return currentPage == 0 ? 1 : currentPage; Rb(SBa
} >J|]moSVA
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privatestaticint getBeginIndex(int everyPage, int [`]4P&
$9S(_xdI&
currentPage){ Y?ez9o:/#
return(currentPage - 1) * everyPage; Rq[ M29
} Q,&