Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 yF _@^V
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 q^I/
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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 CyWMr/'
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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 {hNvCk
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分页支持类: w nPg ).
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java代码: ~{xm(p
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package com.javaeye.common.util; J%
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import java.util.List; {,9^k'9
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publicclass PaginationSupport { y-1!@|l0:6
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publicfinalstaticint PAGESIZE = 30; ]zt77'J
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privateint pageSize = PAGESIZE; Ofm?`SE*|
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privateList items; >QcIrq%=
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privateint totalCount; Qm >x?
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privateint[] indexes = newint[0]; Ld9YbL:
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privateint startIndex = 0; !Z}d^$
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public PaginationSupport(List items, int : g+5cs
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totalCount){ bzC|aUGM
setPageSize(PAGESIZE); 'LyEdlC]
setTotalCount(totalCount); U?[_ d
setItems(items); p_g#iH!*
setStartIndex(0); 7C::%OF~7
} p!_3j^"{
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public PaginationSupport(List items, int \I[f@D-J
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totalCount, int startIndex){ WxrGoo^
setPageSize(PAGESIZE); `Vf k.OP
setTotalCount(totalCount); gx55.}
setItems(items); nF#1B4b>
setStartIndex(startIndex); aQTISX;
} dsiQ~ [
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public PaginationSupport(List items, int K8?]&.!
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totalCount, int pageSize, int startIndex){ Nj^:8]D)0
setPageSize(pageSize);
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setTotalCount(totalCount); fK?/o]vq
setItems(items); ~ZuFMVR
setStartIndex(startIndex); fp)%Cr
} [J-uvxD
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publicList getItems(){ |Q\O%
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return items; gAPD
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} H[M(t^GM
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publicvoid setItems(List items){ F^/b!)4X
this.items = items; ;iq58.
} v"I#.{LiH=
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publicint getPageSize(){ 'Y;M%
return pageSize; 5X1z^(
} u &qFE=5:
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publicvoid setPageSize(int pageSize){ V0O6\)/.
this.pageSize = pageSize; @}oY6cW;B*
} .G~Y`0
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publicint getTotalCount(){ GLpl
return totalCount; x[dR5
} +k<0:Fi
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publicvoid setTotalCount(int totalCount){ Gp.XTz#=
if(totalCount > 0){ G<_<j}=
this.totalCount = totalCount; Gdu5
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int count = totalCount / 9ZVzIv(
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pageSize; ,g~Iup
if(totalCount % pageSize > 0) Kwmtt
count++; F39H@%R
indexes = newint[count]; 921m'WE
for(int i = 0; i < count; i++){ M}Obvl
indexes = pageSize * O+w82!<:
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} n8RE
}else{ a@v}j&
this.totalCount = 0; wnr<# =,I'
} DN 0`vl{*
} \|f3\4;!
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publicint[] getIndexes(){ (l_/ HQ32
return indexes; [zsUboCkc
} dZ6P)R
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publicvoid setIndexes(int[] indexes){ vLT$oiN[c
this.indexes = indexes; +v{g'
} |J^}BXW'^)
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publicint getStartIndex(){ "IuHSjP
return startIndex; &WV&_z
} /y-eVu6
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publicvoid setStartIndex(int startIndex){ SF.Is=b
if(totalCount <= 0) vP @\"
this.startIndex = 0; RqU^Q*/sF
elseif(startIndex >= totalCount) ?igA+(.
this.startIndex = indexes p*5QV
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[indexes.length - 1]; VoG:3qN
elseif(startIndex < 0) 69iY)Ob/
this.startIndex = 0; 2qgm(jo *y
else{ y{k65dk-
this.startIndex = indexes `"s*'P398
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[startIndex / pageSize]; vAt]N)R
} Pu0 <Clh
} ~zO>Q4-k
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publicint getNextIndex(){ 0Bn35.K
int nextIndex = getStartIndex() + 'jA>P\@8
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pageSize; .EB'n{zxd
if(nextIndex >= totalCount) IZSJ+KO
return getStartIndex(); D3(rD]c0{
else 3`+Bq+
return nextIndex; N% !TFQf
} CY</v,\:#
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publicint getPreviousIndex(){ ;%a
int previousIndex = getStartIndex() -
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pageSize; HS@ EV iht
if(previousIndex < 0) B }t529Z
return0; -
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else e jh0Wfl
return previousIndex; z~($
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} g/(3D
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} EC`=nGF
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抽象业务类 EGw;IFj)
java代码: svRYdInBNu
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/** +[B@83
* Created on 2005-7-12 +aZcA#%
*/ T?k!%5,Kj
package com.javaeye.common.business; ,JqCxb9
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import java.io.Serializable; E@/*eJ
import java.util.List; qq'%9
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import org.hibernate.Criteria; |7)oX
import org.hibernate.HibernateException; ;km ^ OO$
import org.hibernate.Session; wB+X@AA
import org.hibernate.criterion.DetachedCriteria; ;2}wrX
import org.hibernate.criterion.Projections; ZbfpMZ g
import $i|d=D&t
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org.springframework.orm.hibernate3.HibernateCallback; CNl @8&R
import wBI>H
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org.springframework.orm.hibernate3.support.HibernateDaoS 3,y zRb
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upport; pg.BOz\'q
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import com.javaeye.common.util.PaginationSupport; 1"S~#
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public abstract class AbstractManager extends Y+nk:9
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HibernateDaoSupport { |crm{]7X
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privateboolean cacheQueries = false; !6FO[^h||H
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privateString queryCacheRegion; ;iO5
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publicvoid setCacheQueries(boolean JXQh$hs
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cacheQueries){ U(:Di]>{
this.cacheQueries = cacheQueries; 1b,MJ~g$
} w&x$RP
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publicvoid setQueryCacheRegion(String dZ|x `bIgs
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queryCacheRegion){ YB]{gm2
this.queryCacheRegion = S+bpWA
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queryCacheRegion; [w{x+6uX'
} #+8G`
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publicvoid save(finalObject entity){ #CRd@k?
getHibernateTemplate().save(entity); s<{) X$
} V/]o':
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publicvoid persist(finalObject entity){ _sK{qQxvM=
getHibernateTemplate().save(entity); $1Qcz,4B|
} in7h^6?I
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publicvoid update(finalObject entity){ ,t
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getHibernateTemplate().update(entity); gX]ewbPDQ
} |ITh2m
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publicvoid delete(finalObject entity){ c2wgJH!g
getHibernateTemplate().delete(entity); `+!F#.
} j:7AVnt
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publicObject load(finalClass entity, ^@f.~4P*I
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finalSerializable id){ p^)w$UL}}
return getHibernateTemplate().load LRqlK\
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(entity, id); 7O,!67+^~
} zs.@=Z"
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publicObject get(finalClass entity, `r]C%Y4?
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finalSerializable id){ 2H/{OQ$
return getHibernateTemplate().get D"CU J?
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(entity, id); ,</Kn~b
} Zp/$:ny
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publicList findAll(finalClass entity){ ) uTFId
return getHibernateTemplate().find("from O=}d:yZb!
`_SV1|=="8
" + entity.getName()); `L%<3/hF
} ]]P@*4!
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publicList findByNamedQuery(finalString M9Xq0BBu
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namedQuery){ \. a 7F4h
return getHibernateTemplate $f=6>Kn|^]
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().findByNamedQuery(namedQuery); 9XhcA
} 3)y=}jw
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publicList findByNamedQuery(finalString query, aSMoee@!
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finalObject parameter){ B.:1fT7lI
return getHibernateTemplate z9E*1B+
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().findByNamedQuery(query, parameter); zKT4j1h
} u82 (`+B
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publicList findByNamedQuery(finalString query, gYBMi)`RT
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finalObject[] parameters){ $HCgawQ
return getHibernateTemplate [eFJ+|U9
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().findByNamedQuery(query, parameters); \h?6/@3ob
} K>TEt5
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publicList find(finalString query){ =#vJqA
return getHibernateTemplate().find _9'hmej
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(query); t N4-<6
} / ;+Mz*
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publicList find(finalString query, finalObject Oh%p1$H
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parameter){ @9~x@[
return getHibernateTemplate().find ^6J*:(eM
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(query, parameter); 0rvBjlFT
} F` &W5[
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public PaginationSupport findPageByCriteria V9jxmu F,
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(final DetachedCriteria detachedCriteria){ L1f=90
return findPageByCriteria bu-6}T+
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); O[\mPFu5
} R{ udV
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public PaginationSupport findPageByCriteria GWLdz0`2_
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(final DetachedCriteria detachedCriteria, finalint -/2B fIq
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startIndex){ =
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return findPageByCriteria 4o"?QV:
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(detachedCriteria, PaginationSupport.PAGESIZE, U8-OQ:2.
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startIndex); T2_iH=u
} Z}{]/=h
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public PaginationSupport findPageByCriteria p{:y?0pGN
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(final DetachedCriteria detachedCriteria, finalint ?J-\}X
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pageSize, zszmG^W{
finalint startIndex){ |6;-P&_n
return(PaginationSupport) ||ugb6q[6B
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getHibernateTemplate().execute(new HibernateCallback(){ ZH*h1?\X
publicObject doInHibernate zl|
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(Session session)throws HibernateException { wqT9m*VK
Criteria criteria = \hn$-'=4
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detachedCriteria.getExecutableCriteria(session); Xvoz4'Gme
int totalCount = e-OKv#]
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((Integer) criteria.setProjection(Projections.rowCount 8I Ip,#%v
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()).uniqueResult()).intValue(); Y]5spqG
criteria.setProjection hn\d{HP
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(null); Sk)lT^by
List items = {> 8?6m-
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criteria.setFirstResult(startIndex).setMaxResults xR8.1T?8
,p /{!BX
(pageSize).list(); l}r 9kS
PaginationSupport ps = NqGSoOjIO2
8!HB$vdw7
new PaginationSupport(items, totalCount, pageSize, cx ("F/Jm
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startIndex); s~bi#U;dF
return ps; ~I9o* cq
} "RM\<)IF
}, true); 7=5eLc^
} T\(k=0RM
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public List findAllByCriteria(final >]&Ow9-
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DetachedCriteria detachedCriteria){ :Ocw+X3
return(List) getHibernateTemplate [~X&J#
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().execute(new HibernateCallback(){ ``I[1cC
publicObject doInHibernate $d!Vx m
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(Session session)throws HibernateException { co1aG,>"q
Criteria criteria = (xoYYO
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detachedCriteria.getExecutableCriteria(session); KV$4}{
return criteria.list(); FvG?%IFM
} c8Ud<M .
}, true); Zd%wX<hU"
} XogCq?_m
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public int getCountByCriteria(final Gi#-TP\
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DetachedCriteria detachedCriteria){ Hb::;[bm:
Integer count = (Integer) LkP
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getHibernateTemplate().execute(new HibernateCallback(){ IGT9}24
publicObject doInHibernate S D{ )Sq
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(Session session)throws HibernateException { [p~,;%
Criteria criteria = nxx/26{
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detachedCriteria.getExecutableCriteria(session); Dg"szJ-
return K)se$vb6
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criteria.setProjection(Projections.rowCount y22DBB8
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()).uniqueResult(); %''L7o.#a
} %+Y wzL{
}, true); ?@;)2B|q
return count.intValue(); s,8zj<dUv
} >`SeX:
} q<!-Anc
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用户在web层构造查询条件detachedCriteria,和可选的 hV0fkQ.|
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 % @+j@i`&
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PaginationSupport的实例ps。 'L-DMNxBr
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ps.getItems()得到已分页好的结果集 {>9ED.t
ps.getIndexes()得到分页索引的数组 |3yG
ps.getTotalCount()得到总结果数 #0Y_!'j
ps.getStartIndex()当前分页索引 %Nvw`H
ps.getNextIndex()下一页索引 kltW
ps.getPreviousIndex()上一页索引 *o4a<.hd2
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 +kQ=2dva
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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 MuQ)F-GSUu
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一下代码重构了。 i,a"5DR8
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我把原本我的做法也提供出来供大家讨论吧: A;RV~!xx
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首先,为了实现分页查询,我封装了一个Page类: :S_]!'H
java代码: &JqaIJh
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/*Created on 2005-4-14*/ 3^~J;U!3
package org.flyware.util.page; \#t)B
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/** '!8-/nlv1
* @author Joa 0]iaNR
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* $Oy&POe
*/ BLO ]78
publicclass Page { ?z&%VU"
7[1|(6$
/** imply if the page has previous page */ iW>^'W#
privateboolean hasPrePage; ){"?@1vP
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/** imply if the page has next page */ ceJi|`F
privateboolean hasNextPage; J:glJ'4E
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/** the number of every page */ Z%B6J>;u M
privateint everyPage; X(*O$B{
R
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/** the total page number */ w,FPL&{
privateint totalPage; &4S2fWx
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/** the number of current page */ N\ !
privateint currentPage; /}m*|cG/
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/** the begin index of the records by the current y7fy9jQ
8.
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query */ iI";m0Ny
privateint beginIndex; Gw$ 5<%sB
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/** The default constructor */ 0O>ClE~P
public Page(){ ~;#}aQYo
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} ()l3X.t,$
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/** construct the page by everyPage Q}L?o
* @param everyPage yW=+6@A4
* */ C$1W+(
public Page(int everyPage){ ]>VG}e~b
this.everyPage = everyPage; >- \bLr
} ZDW=>}~_y
@nY]S\if
/** The whole constructor */ src+z#
public Page(boolean hasPrePage, boolean hasNextPage, ~EPVu
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int everyPage, int totalPage, ~!
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int currentPage, int beginIndex){ ~$g:
this.hasPrePage = hasPrePage; BA]$Fi.Mw
this.hasNextPage = hasNextPage; ,dCEy+
this.everyPage = everyPage; bT^dtEr[
this.totalPage = totalPage; WqCC4R,-
this.currentPage = currentPage; QH9t |l
this.beginIndex = beginIndex; l\*9rs:!
} @5S' 5)4pB
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/** SscB&{f
* @return /D3{EjUE=
* Returns the beginIndex. zTw"5N
*/ _y^r==
publicint getBeginIndex(){ 5o dT\>Sn
return beginIndex;
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} o'!=x$Ky
,
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/** 1
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* @param beginIndex @a?7D;+<
* The beginIndex to set. 5dj@N3ZX7;
*/ -{xk&EB^$5
publicvoid setBeginIndex(int beginIndex){ 9_?xAJ
this.beginIndex = beginIndex; "+ou!YK+
} <ukBAux,D
>Q\Kc=Q|
/** {7OHEArv
* @return Y"GNJtsL "
* Returns the currentPage. n|~y
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*/
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publicint getCurrentPage(){ 67II9\/
return currentPage; :pqUUZ6x&
} >5t%_/yeB
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/** +nDy b
* @param currentPage m0"K^p
* The currentPage to set. TmQIpeych
*/ M Irx,d
publicvoid setCurrentPage(int currentPage){ rGyAzL]
this.currentPage = currentPage; fORkH^Y(&
} {_O!mI*
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/** go uU
* @return >%j%Mj@8q|
* Returns the everyPage. ?BnU0R_r]
*/ {arqcILr
publicint getEveryPage(){ N]A# ecm
return everyPage; (jM0YtrD
} r!mRUw'u
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/** YA4 D?'
* @param everyPage *j%x
* The everyPage to set. '+PKGmRW
*/ `<C<[JP:o
publicvoid setEveryPage(int everyPage){ 9{toPED
this.everyPage = everyPage; 6Yj{%
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} uZ!YGv0^
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/** P=QxfX0B
* @return <xOX+D
* Returns the hasNextPage. kJWg},-\
*/ 7>JTQ CJ
publicboolean getHasNextPage(){ d~LoHp
return hasNextPage; h Jb2y`,q
} z%82Vt!a5
;A*SuFbV
/** &|/_"*uM
* @param hasNextPage L8VOiK=,
* The hasNextPage to set. ;o_F<68QP
*/ !(GyOAb
publicvoid setHasNextPage(boolean hasNextPage){ nI\6aG?`
this.hasNextPage = hasNextPage; Y}:~6`-jj
} k{}> *pCU
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/** pM?;QG;jA
* @return JE?rp1.
* Returns the hasPrePage. 3e_tT8
*/ /Nf{;G!kg
publicboolean getHasPrePage(){ ;w7 mr1
return hasPrePage; y6XOq>
} O$,Fga
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/** utlr|m Xc
* @param hasPrePage 53HA6:Q[
* The hasPrePage to set. !_S#8"
*/ ~||0lj.D
publicvoid setHasPrePage(boolean hasPrePage){ 6hxZ5&;(*
this.hasPrePage = hasPrePage; a+w2cN'
} QNj]wm=mp
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/** (Rw<1q`,
* @return Returns the totalPage. 2Y
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* ge~@}iO@
*/ *]$B 9zVs!
publicint getTotalPage(){ DXs an
return totalPage; U\KMeaF5e-
} 3gA %Q`"
|&; ^?M
/** QJ|@Y(KV0
* @param totalPage B~p%pTS+
* The totalPage to set. (8duV
*/ ^q:-ZgM>
publicvoid setTotalPage(int totalPage){ 17LhgZs&
this.totalPage = totalPage; 5 ~Wg=u<6
} Z>hTL_|]a{
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} #-/W?kD
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to={q
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 7EJ2 On
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个PageUtil,负责对Page对象进行构造: Ds9)e&yYrb
java代码: K@JZ$
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/*Created on 2005-4-14*/ B
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package org.flyware.util.page; Q+:y
]; w 2YR
import org.apache.commons.logging.Log; P`Np+E#I
import org.apache.commons.logging.LogFactory; %B s. XW,
2~4:rEPJ:
/** AZj&;!}
* @author Joa C/kf?:j
* ~iL^KeAp
*/ uo9#(6
publicclass PageUtil { Q]ersA8 V>
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privatestaticfinal Log logger = LogFactory.getLog i'IT,jz!
slQn
(PageUtil.class); c_J9CKqc
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/** VY?9|};f
* Use the origin page to create a new page c+Q'4E0|
* @param page ++cS^ Lo
* @param totalRecords HW@wia
* @return eg0_ <
*/ iq#{*:1
publicstatic Page createPage(Page page, int MmF&jd-=
w#A)B<Y/"
totalRecords){ [!'+}
return createPage(page.getEveryPage(), 6Yu:v
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page.getCurrentPage(), totalRecords); b^o4Q[
} b8mH.g&l
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/** VYk:c`E
* the basic page utils not including exception J9^NHU
#Hw|P
handler ?CpVA
* @param everyPage E C#0-,z
* @param currentPage d"wA"*8~y
* @param totalRecords G|6qL
* @return page 77>oQ~q
*/ 8mI(0m'
publicstatic Page createPage(int everyPage, int 0At0`Q#
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currentPage, int totalRecords){ m1$tf
^
everyPage = getEveryPage(everyPage); I^NDJdxd
currentPage = getCurrentPage(currentPage); !T6R[
int beginIndex = getBeginIndex(everyPage, Oa|c ?|+
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currentPage); eqx }]#
int totalPage = getTotalPage(everyPage, [doEArwn
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totalRecords); dlu*s(O"
boolean hasNextPage = hasNextPage(currentPage, ?qh-#,O9B
"{q#)N
totalPage); #{i*9'
boolean hasPrePage = hasPrePage(currentPage); waMF~#PJlt
}7 N6nZj`
returnnew Page(hasPrePage, hasNextPage, = Xgo}g1
everyPage, totalPage, q lc@$
currentPage, `fv5U%
fzsy<Vl",
beginIndex); SUS=sR/N
} fG0 ?"x@>
gZ @+62
privatestaticint getEveryPage(int everyPage){ RGW@@
return everyPage == 0 ? 10 : everyPage; 'I[?R&j$G
} fz'qB-F
Y
!KHgHKEW^
privatestaticint getCurrentPage(int currentPage){ uibmQ|AQ
return currentPage == 0 ? 1 : currentPage; XKp&GE@Y
} 8^7Oc,:~
ug3\K83aj/
privatestaticint getBeginIndex(int everyPage, int 09kR2(nsW/
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currentPage){ 3j7FG%\
return(currentPage - 1) * everyPage; b8WtNVd
} cu!%aM,/<-
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privatestaticint getTotalPage(int everyPage, int c1YDln
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totalRecords){ L2H
int totalPage = 0; j.E=WLKV*
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if(totalRecords % everyPage == 0) nrac)W
totalPage = totalRecords / everyPage; <PLAAh8
else ^rWg:fb
totalPage = totalRecords / everyPage + 1 ; atL<mhRz
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return totalPage; lM-9 J?j
} $n<a`PdH
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privatestaticboolean hasPrePage(int currentPage){ $1f2'_`8~
return currentPage == 1 ? false : true; BgQEd@cN
} k:0j;\Sx
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privatestaticboolean hasNextPage(int currentPage, 0Lo8pe`DH
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int totalPage){ HTQZIm
return currentPage == totalPage || totalPage == -WC0W
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0 ? false : true; W[2]$TwT
} Xa[k=qFo
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} sz9W}&(j
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 *.W3V;K
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 jTa\I&s