Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 |WiK*
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 BO b#9r
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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 }5RCks;)*
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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
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分页支持类: a&Ti44a[
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java代码: xQ
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package com.javaeye.common.util; bP`.teO\
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import java.util.List; 0R,?$qM\
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publicclass PaginationSupport { "28b&pm
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publicfinalstaticint PAGESIZE = 30; a
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privateint pageSize = PAGESIZE; |pv:'']J
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privateList items; d/8I&{.
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privateint totalCount; a;Q6S
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privateint[] indexes = newint[0]; eI@LVi6<b
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privateint startIndex = 0; K .cMuh
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public PaginationSupport(List items, int ]q0mo1-EZ!
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totalCount){ D7b<&D@
setPageSize(PAGESIZE); \v7M`! &
setTotalCount(totalCount); 6@-VLO))O
setItems(items); Kr!(<i
setStartIndex(0); 0x Vue[ep
} s[|sfqB1`
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public PaginationSupport(List items, int #Sj:U1x
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totalCount, int startIndex){ 6,sZo!G
setPageSize(PAGESIZE); /wB<1b"
setTotalCount(totalCount); )+c4n]
setItems(items); K@P5]}'#
setStartIndex(startIndex); )8ejT6r
} EKsL0;FV
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public PaginationSupport(List items, int vu[+UF\G
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totalCount, int pageSize, int startIndex){ /sf:.TpVh
setPageSize(pageSize); }qlU
setTotalCount(totalCount); 'dYjbQ}~;
setItems(items); ,v$gWA!l
setStartIndex(startIndex); i DV.L
} %D|27gh
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publicList getItems(){ *hVW>{a
return items; lBS!=/7
} D!kv+<+
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publicvoid setItems(List items){ JPQ[JD^]
this.items = items; W is_N3M
} 'v.i' 6
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publicint getPageSize(){ )cnB>Qul
return pageSize; 5|!x0H;
} -o<L%Y<n2
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publicvoid setPageSize(int pageSize){ *a* \E
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this.pageSize = pageSize; Ml` f+$
} EOu\7;kE9
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publicint getTotalCount(){ L;=:OX0
return totalCount; & IVwm"
} $Scb8<
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publicvoid setTotalCount(int totalCount){ t>QAM6[
if(totalCount > 0){ Jw'%[(q
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this.totalCount = totalCount; +!IIt {u
int count = totalCount / LC/9)Sh_n
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pageSize; \xi
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if(totalCount % pageSize > 0) `JyTS~v$
count++; uM,bO*/f
indexes = newint[count]; ((wG
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for(int i = 0; i < count; i++){ JX,&im*BG
indexes = pageSize * lwhAF, '$
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i; W8j)2nKD
} _Z'j%/-4@D
}else{ })O^xF~
this.totalCount = 0; W!pLk/|ls
} <Y9vc:S
} w4U]lg<}E
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publicint[] getIndexes(){ ,Ju f
return indexes; qepsR/0M
} l$D]*_ jc,
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publicvoid setIndexes(int[] indexes){ (#FWA<o
this.indexes = indexes; n.]K"$230
} sXp>4MomV
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publicint getStartIndex(){ h(!x&kZq.
return startIndex; L@Fw;G|%'
} 6>ZUx}vYj
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publicvoid setStartIndex(int startIndex){ 8MgoAX,p
if(totalCount <= 0) )tGeQXVhbJ
this.startIndex = 0; u"r~5
elseif(startIndex >= totalCount) pOQ'k>!
this.startIndex = indexes sJ)XoK syW
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[indexes.length - 1]; 4`5 jq)
elseif(startIndex < 0) Jr
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this.startIndex = 0; AVyO5>w
else{ v;"[1w}
this.startIndex = indexes vt}+d
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[startIndex / pageSize]; dABmK;
} sh(G{Yz@
} @ROMHMd}
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publicint getNextIndex(){ @mBZu!,
int nextIndex = getStartIndex() + N*w/\|
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pageSize; %7 h_D
if(nextIndex >= totalCount) <CIJg*
return getStartIndex(); ko\VDyt,
else s@sRdoTdF
return nextIndex; k"F5'Od
} b=v
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publicint getPreviousIndex(){ {#N](yUm
int previousIndex = getStartIndex() - #UL:#pY
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pageSize; }I<r=?
if(previousIndex < 0) 9X&Xc
return0; &1Dq3%$c
else @ qWgokf
return previousIndex; r#
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} tr0P;}=
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} +@[T0cXp
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抽象业务类 {h/[!I`
java代码: U8L%=/N>B
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/** )8vz4e Y
* Created on 2005-7-12 @Z> {/
*/ ]TQ2PVN2
package com.javaeye.common.business; v'uWmL7C
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import java.io.Serializable; eAN]*:]g
import java.util.List; s^+h>
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import org.hibernate.Criteria; FWI<_KZO
import org.hibernate.HibernateException; ]s-;*o\H
import org.hibernate.Session; x? 3U3\W
import org.hibernate.criterion.DetachedCriteria; W1S7%6y_1
import org.hibernate.criterion.Projections; 8P5yaS_
import Rhh5r0 \5
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org.springframework.orm.hibernate3.HibernateCallback; !'uL
import V(Ll]g/T_;
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org.springframework.orm.hibernate3.support.HibernateDaoS A g=>F5
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upport; mne4u W
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import com.javaeye.common.util.PaginationSupport; (c;F%m|
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public abstract class AbstractManager extends y<(q<V#0!S
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HibernateDaoSupport { *YmR7g |k
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privateboolean cacheQueries = false; Z18T<e
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privateString queryCacheRegion; ?g
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publicvoid setCacheQueries(boolean NrH2U Jm
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cacheQueries){ /H.w0fu&.S
this.cacheQueries = cacheQueries; [. Vy
} #DK@&Gv
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publicvoid setQueryCacheRegion(String t}L kl(
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queryCacheRegion){ R6l`IlG`
this.queryCacheRegion = A;ip
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queryCacheRegion; =@(&xfTC
} J%ng8v5ex
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publicvoid save(finalObject entity){ n{sF'n</
getHibernateTemplate().save(entity); 87WIDr
} ..BIoSrj
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publicvoid persist(finalObject entity){ &?N1-?BjM
getHibernateTemplate().save(entity); hG~4i:p
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} d-/{@
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publicvoid update(finalObject entity){ o2M+=O@
getHibernateTemplate().update(entity); Tbf't^Ot$
} lId}sf
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publicvoid delete(finalObject entity){ D5lzrpg _e
getHibernateTemplate().delete(entity); dqF]kP,VG
} IoO t n
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publicObject load(finalClass entity, r}351S5(
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finalSerializable id){ =rSJ6'2("
return getHibernateTemplate().load SFhi]48&V
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(entity, id); 1;_tu
} <u "xHl8Io
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publicObject get(finalClass entity, Y%<y`]I
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finalSerializable id){ <12 ia"}
return getHibernateTemplate().get qTc-Z5
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(entity, id); ay~c@RXW
} {"{kWbXZ
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publicList findAll(finalClass entity){ h-r\1{Q1]
return getHibernateTemplate().find("from #snwRW>=[
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" + entity.getName()); aumWU{j=
} }%e"A4v
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publicList findByNamedQuery(finalString B=dF\.&Z
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namedQuery){ Dp1FX"a)
return getHibernateTemplate k;EG28
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().findByNamedQuery(namedQuery); K4w %XVaH
} C8ss6+k&
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publicList findByNamedQuery(finalString query, X}j WNN
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finalObject parameter){ Iv,Ub_Ll9
return getHibernateTemplate @4sEHk
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().findByNamedQuery(query, parameter);
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} [=3f:>ssm
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publicList findByNamedQuery(finalString query, $MW-c*5a
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finalObject[] parameters){ 87&BF)]
return getHibernateTemplate YdgDMd-1
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().findByNamedQuery(query, parameters); {B;<R1
} $a
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publicList find(finalString query){ H]]UsY`
return getHibernateTemplate().find %K9pnq/T^
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(query); 1#nR$
} o 8fB
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publicList find(finalString query, finalObject 3)D' Yx
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parameter){ I`e$U
return getHibernateTemplate().find n,,hE_
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(query, parameter); |ZJ<J)y
} mBAI";L3
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public PaginationSupport findPageByCriteria Kivr)cIG
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(final DetachedCriteria detachedCriteria){ _1>Xk_
return findPageByCriteria adCTo
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); jRn5)u
} ~ShoU
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public PaginationSupport findPageByCriteria ?$chO|QY
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(final DetachedCriteria detachedCriteria, finalint [
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startIndex){ N<d0C
return findPageByCriteria 0\B31=N(
#1,"^k^
(detachedCriteria, PaginationSupport.PAGESIZE, 0c-.h
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startIndex); ?'xwr)v
} BB$(0mM^
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public PaginationSupport findPageByCriteria m2{DLw".
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(final DetachedCriteria detachedCriteria, finalint J2_~iC&;s
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pageSize, ]J '#KT{
finalint startIndex){ %pJRu-D
return(PaginationSupport) q.}M^iDe
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getHibernateTemplate().execute(new HibernateCallback(){ jV|j]m&t
publicObject doInHibernate ~10 >mg
},]G +L;R
(Session session)throws HibernateException { _N @h
Criteria criteria = Z&Qz"V>$
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detachedCriteria.getExecutableCriteria(session); uc~/l4~N
int totalCount = {0(:5%
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((Integer) criteria.setProjection(Projections.rowCount 1H-d<G0)
n)<S5P?
()).uniqueResult()).intValue(); ELvP<Ny}
criteria.setProjection B=<Z@u
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(null); VG=mA4Dd
List items = 5LX'fL7zU
#^>Md59N
criteria.setFirstResult(startIndex).setMaxResults 15l{gbCW
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(pageSize).list(); pzcl@
PaginationSupport ps = kq4ii`zi8
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new PaginationSupport(items, totalCount, pageSize, W"meH~[Cp
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startIndex); xwJ.cy
return ps; `;c{E%qeq
} 2=%R>&]*
}, true); )IFFtU~,
} au;ZAXM|
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public List findAllByCriteria(final 2?}5U)Hg
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DetachedCriteria detachedCriteria){ xb (Cd
return(List) getHibernateTemplate ;1MRBk,
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().execute(new HibernateCallback(){ C f(g
publicObject doInHibernate dI%#cf1
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(Session session)throws HibernateException { =>mx>R`S
Criteria criteria = a W9_[#z5
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detachedCriteria.getExecutableCriteria(session); dRGgiQO
return criteria.list(); EpCT !e
} %>z)Q
}, true); /@O$jlX5I
} -tH ^Deo
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public int getCountByCriteria(final i.5?b/l0
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DetachedCriteria detachedCriteria){ S)\Yc=~h
Integer count = (Integer) L#~z#
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getHibernateTemplate().execute(new HibernateCallback(){ 4Q?3gA1
publicObject doInHibernate ?.~hex#M@
= lMs1}S9
(Session session)throws HibernateException { T*"*##c
Criteria criteria = )Kbz gmLr
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detachedCriteria.getExecutableCriteria(session); 50R&;+b
return O?OG`{k
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criteria.setProjection(Projections.rowCount 2'-!9!C
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()).uniqueResult(); x@Ze%$'
} '\wZKYVN
}, true); hhr!FQ.+/
return count.intValue(); 2JR$
} nl/~7({
} n:P++^ j
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用户在web层构造查询条件detachedCriteria,和可选的 Z[%vO?,
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 SLjSNuOP
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PaginationSupport的实例ps。 ;NPbEPL[5
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ps.getItems()得到已分页好的结果集 P^-daRb
ps.getIndexes()得到分页索引的数组 #,jw! HO]
ps.getTotalCount()得到总结果数 i7jI(VvB^
ps.getStartIndex()当前分页索引 "bmWr)
ps.getNextIndex()下一页索引 V6a+VfH
ps.getPreviousIndex()上一页索引 3cB=9Y{<
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 _J ZlXY
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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 |S.;']t+
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一下代码重构了。 %Q. |qyq
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我把原本我的做法也提供出来供大家讨论吧: Nu4PY@m]C
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首先,为了实现分页查询,我封装了一个Page类: ?5Q_G1H&
java代码: Br}0dha3E
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/*Created on 2005-4-14*/ "LkI '>3}
package org.flyware.util.page; 0`~#H1TK
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/** JL:\\JT.
* @author Joa ,k+F8{Q.
* QQW]j;'~
*/ BW5! @D2
publicclass Page { 1 R,?kUa
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/** imply if the page has previous page */ 8i Xt8XY3
privateboolean hasPrePage; m5kt
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/** imply if the page has next page */ `\M}~
privateboolean hasNextPage; aC,?FWm
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/** the number of every page */ CMviR<.
privateint everyPage; Q)%a2s;
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/** the total page number */ 353*D%8
privateint totalPage; WX}pBmU
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/** the number of current page */ Ek,$XH
privateint currentPage; mY0FewwTy
*]+5T-R% $
/** the begin index of the records by the current rpMjDjW
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query */ mj|TWDcj+
privateint beginIndex; >O/1Lpl.3
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/** The default constructor */ BU=;rz!;
public Page(){
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} ]Z=O+7(r
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/** construct the page by everyPage "S^""5
* @param everyPage g$9EI\a
* */ %Z!3[.%F
public Page(int everyPage){ Vm]u-R`{
this.everyPage = everyPage; :7DXLI|L#?
} CoTe$C7
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/** The whole constructor */ &eY&6I
public Page(boolean hasPrePage, boolean hasNextPage, 65>}Q.p
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int everyPage, int totalPage, a@s@E
int currentPage, int beginIndex){ ^7,`6g
this.hasPrePage = hasPrePage; {qbxiL-
this.hasNextPage = hasNextPage; SioP`*,}
this.everyPage = everyPage; 3Ued>8Gv
this.totalPage = totalPage; YAJr@v+Ls
this.currentPage = currentPage; uraT$Q}
this.beginIndex = beginIndex; xQ~N1Y2W
} 4>}qdR1L4
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/** apw/nhQ.[
* @return |]+PDc%
* Returns the beginIndex. ^J?y
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*/ [a!*m<
publicint getBeginIndex(){ z!>ml3
return beginIndex; &p_V<\(%
} Ew>lk9La(
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/** }&Kl)2:O
* @param beginIndex rJUXIV>z
* The beginIndex to set. vD3j(d
*/ SU>cJ*
publicvoid setBeginIndex(int beginIndex){ _8ubo\M~
this.beginIndex = beginIndex; /& wA$h
} /@feY?glc
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/** P)rz%,VF+
* @return _t.Ub:
* Returns the currentPage. M~LYq
*/ JLu>w:\
publicint getCurrentPage(){ Z<W`5sop^
return currentPage; o*Kl`3=]
} .XPPd?R
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/** eiwPp9[08
* @param currentPage *Vr;rk
* The currentPage to set. B~7]x;8h
*/ WeE1 \
publicvoid setCurrentPage(int currentPage){ 141XnAb)I
this.currentPage = currentPage; st-I7K\v
} f\h|Z*Bv
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/** 1,Ji|&Pwf
* @return Bl*.N9*
* Returns the everyPage. ZP;WXB`
*/ t^SND{[WcM
publicint getEveryPage(){ mt*/%>@7R
return everyPage; `~+[pY1r
} ]5sU =\
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/** W $E Ao+V
* @param everyPage yR4++yk
* The everyPage to set. _a-At
*/ n2;Vrs,<1&
publicvoid setEveryPage(int everyPage){ B(qwTz 51
this.everyPage = everyPage; yYn7y1B
} %w#8t#[,6
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/** #B&%Y6E5
* @return 8rpr10;U
* Returns the hasNextPage. TT3\c,cs
*/ 3&"+)*/ m
publicboolean getHasNextPage(){ r(DW,xoK0
return hasNextPage; `PI?RU[g*
} f}uW(:f
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/** BfdS3VrZ/
* @param hasNextPage Xn*>qm
* The hasNextPage to set. 8Y&_X0T|
*/ se`^g
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publicvoid setHasNextPage(boolean hasNextPage){ =q?s B]n
this.hasNextPage = hasNextPage; zsmlXyP'e!
} 1y7FvD~ v
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/** -@?4Tfl
* @return .BrYz:#A
* Returns the hasPrePage. 23*OuY
*/ NkY7Hg0
publicboolean getHasPrePage(){ B> V)6\
return hasPrePage; w*krPaT3
} N`rz>6,k1
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/** 7 jiy9[
* @param hasPrePage WI\jm&H r
* The hasPrePage to set. _8&a%?R@W
*/ uE-|]QQo
publicvoid setHasPrePage(boolean hasPrePage){ %WAaoR&u
this.hasPrePage = hasPrePage; IUSV\X9
} j+NsNIJq
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/** W~d^ *LZt
* @return Returns the totalPage. U}^`R,C
* -AZ\u\xCB
*/ `*w!S8} m;
publicint getTotalPage(){ *r].EBJ\
return totalPage; :?f^D,w_B
} )2: ,E
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/** ]Pf!wv
* @param totalPage iKA}??5e
* The totalPage to set. Z@6xu;O
*/ E<r<ObeRv`
publicvoid setTotalPage(int totalPage){ Z^6qxZJ7
this.totalPage = totalPage; 33OkYC%e
} ]3I@5 }5%
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} rB}2F*eT
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 AGK{t+`
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个PageUtil,负责对Page对象进行构造: Bnh*;J0
java代码: RKD$'UWX
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/*Created on 2005-4-14*/ |^C35 6M>
package org.flyware.util.page; jYE
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import org.apache.commons.logging.Log; zCI.^^<?
import org.apache.commons.logging.LogFactory; L-VisZ-FK
V* H7m'za
/** UYvdzCUh
* @author Joa wH]Y1 m
* 6@-O#,]J
*/ LZz]4Mf
publicclass PageUtil { ?v}S9z
w<Ot0&