Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 uC <|T
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 #,Fx@3y\a
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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 ]G$!/vXP
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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 C/grrw
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分页支持类: Rqv+N]
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java代码: Mz%d_
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package com.javaeye.common.util; |iF1A
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import java.util.List; p]J]<QaZD
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publicclass PaginationSupport { !E(J
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publicfinalstaticint PAGESIZE = 30; 6.(]}?g1f
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privateint pageSize = PAGESIZE; Jq=>H@il
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privateList items; \t7zMp
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privateint totalCount; %'p|JS
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privateint[] indexes = newint[0]; A`mf 8'nTG
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privateint startIndex = 0; )l/C_WEK
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public PaginationSupport(List items, int 2oNPR+
-
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totalCount){ kK_>*iCMo
setPageSize(PAGESIZE); DNTRLIKa
setTotalCount(totalCount); vzT6G/
setItems(items); c_j)8
setStartIndex(0); WLA_YMlA
} RdpQJ)3F
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public PaginationSupport(List items, int ,L;c{[*rh
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totalCount, int startIndex){ Ij,?G*
setPageSize(PAGESIZE); 9dhFQWz"
setTotalCount(totalCount); YfYL?G
setItems(items); u8)r
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setStartIndex(startIndex); ;z=C^'
} :8/M6-EK
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public PaginationSupport(List items, int \c`r9H^v{
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totalCount, int pageSize, int startIndex){ . KSr@Gz
setPageSize(pageSize); (\[!,T"[
setTotalCount(totalCount); E EnTq
setItems(items); (]#
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setStartIndex(startIndex); "q#kh,-C
} 9\;/-0P
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publicList getItems(){ 41_sSqq;^
return items; Tx&qp#FS
} #._6lESK
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publicvoid setItems(List items){ pJ@DHj2@
this.items = items; ?.'oxW
} rD)v%vvr&`
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publicint getPageSize(){ 5v03<m0`y
return pageSize; AhFI, x
} X2mm'JDwK
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publicvoid setPageSize(int pageSize){ Q $,kB<M
this.pageSize = pageSize;
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} _TeRsA
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publicint getTotalCount(){ "r(pK@h
return totalCount; Vste$V
} D
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/ o3FK
publicvoid setTotalCount(int totalCount){ y8 u)Q
if(totalCount > 0){ qSs^}eN
this.totalCount = totalCount; rcb/X`l=
int count = totalCount / rG'k<X~7
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pageSize; i /U{dzZ
if(totalCount % pageSize > 0) t
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count++; $@!&ML
indexes = newint[count]; ^oZs&+z
for(int i = 0; i < count; i++){ ?;kc%Rz
indexes = pageSize * JqhVD@1{
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i; 4BL,/(W]
x
} KQI} 5
}else{ _|#|mb4Fe
this.totalCount = 0; PX{~! j%n
} tqk6m# @(
} &:{yf=
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publicint[] getIndexes(){ u>Kvub
return indexes; ue2nfp
} Ji?UG@
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publicvoid setIndexes(int[] indexes){ t|XC4:/>T
this.indexes = indexes; tm#y`1-
} s+t eYL#Zi
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publicint getStartIndex(){ ~Q\uP(!D
return startIndex; Ss/="jC
} WY UU-
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publicvoid setStartIndex(int startIndex){ im\Ws./
if(totalCount <= 0) p;01a
this.startIndex = 0; =!Cvu.~},
elseif(startIndex >= totalCount) C#cEMKa
this.startIndex = indexes (G;*B<|A
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[indexes.length - 1]; +\m!#CSA
elseif(startIndex < 0) Vp94mi#L}
this.startIndex = 0; j;vaNg|vQ
else{ M:M<bz Vu
this.startIndex = indexes D1/$pA+B
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[startIndex / pageSize]; 51usiOq
} D(GHkS*0q
}
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publicint getNextIndex(){ (9%%^s]uPT
int nextIndex = getStartIndex() + zYJxoC{
7 {<lH%Tn
pageSize; ]d(}b>gR~(
if(nextIndex >= totalCount) $SgD|
9
return getStartIndex(); p.olXP
else :.^rWCL2
return nextIndex; 2%H(a)
} #$QY[rf=6
ttRH[[E(
publicint getPreviousIndex(){ zW.sXV,
int previousIndex = getStartIndex() - 9|DC<Zn&B#
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pageSize; +r"$?bw'
if(previousIndex < 0) ,iy
return0; k$/].P*!
else <GEn9;\
return previousIndex; BW[K/l~"$:
} K.I r+SB
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} _FgeE`X
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抽象业务类 VVOt%d
java代码: -OxHQ
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/** 3dLz=.=)'
* Created on 2005-7-12 *WG}K?"/
*/ @YELqUb*
package com.javaeye.common.business; $Tza<nA
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import java.io.Serializable; [OSUARm
v
import java.util.List; h'+ swPh
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import org.hibernate.Criteria; g(^l>niF:
import org.hibernate.HibernateException; AJmzg
import org.hibernate.Session; 1<UQJw45
import org.hibernate.criterion.DetachedCriteria; b :00w["
import org.hibernate.criterion.Projections; mLO6`]p{H
import I6_+3}Hm{
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org.springframework.orm.hibernate3.HibernateCallback; z7o59&
import Yaqim<j
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org.springframework.orm.hibernate3.support.HibernateDaoS =v-D}eJQ=
B=7L+6
upport; =*I9qjla[?
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import com.javaeye.common.util.PaginationSupport; [sBD|P;M
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public abstract class AbstractManager extends ge|}'QKow
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HibernateDaoSupport { :Pv{E
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privateboolean cacheQueries = false; x8[8z^BV?e
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privateString queryCacheRegion; !VW#hc\A5
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publicvoid setCacheQueries(boolean 6 S8#[b
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cacheQueries){ PuWF:'w r
this.cacheQueries = cacheQueries; @({65 gJ*
} VCI G+Gz
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publicvoid setQueryCacheRegion(String YeQX13C"Z
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queryCacheRegion){ ?AEpg.9R-
this.queryCacheRegion = UU_k"D~
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queryCacheRegion; UX6-{
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} KM6r}CDHs
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publicvoid save(finalObject entity){ &\A$Rj)
getHibernateTemplate().save(entity); +#O?sI#
} 2IGAZ%%
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publicvoid persist(finalObject entity){ Gh j[nsoC~
getHibernateTemplate().save(entity); a}yJ$6xi
} B=f{`rM)~W
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publicvoid update(finalObject entity){ SpkD
getHibernateTemplate().update(entity); !cfn%+0
} 'vXrA
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publicvoid delete(finalObject entity){ "*UHit;"+{
getHibernateTemplate().delete(entity); jYU#]
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} `=oN &!
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publicObject load(finalClass entity, B!,})F$x
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finalSerializable id){ b747 eR 7E
return getHibernateTemplate().load !=ZbBUJF
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(entity, id); "kMpa]<c-6
} )%*uMuF
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publicObject get(finalClass entity, sYvO"|
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finalSerializable id){ uvT]MgT
return getHibernateTemplate().get l?ofr*U&-x
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(entity, id); ~(}zp<e|
} En1pz\'
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publicList findAll(finalClass entity){ :z.<||T
return getHibernateTemplate().find("from JIK;/1
&D/_@\ 0
" + entity.getName()); yHCBf)N7\
} /7*u!CNm
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publicList findByNamedQuery(finalString BONM:(1
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namedQuery){ 98x(2fCvF(
return getHibernateTemplate mgS%YG
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().findByNamedQuery(namedQuery); " 4s,a
} (d_{+O"
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publicList findByNamedQuery(finalString query, p3X>
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finalObject parameter){ ZYg="q0x&
return getHibernateTemplate
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().findByNamedQuery(query, parameter); k)'c$
} JI(8{ f
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publicList findByNamedQuery(finalString query, Kg9REL@,s
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finalObject[] parameters){ O0wD"V^W
return getHibernateTemplate g!4"3Dtdg
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().findByNamedQuery(query, parameters); nsYS0
} V+_L9
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publicList find(finalString query){ $$AKz\
return getHibernateTemplate().find oMcX{v^"
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(query); }56"4/ Z
} f:e~ystm
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publicList find(finalString query, finalObject H+F'K
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parameter){ 6MF%$K3
return getHibernateTemplate().find tFXG4+$D
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(query, parameter); jPhOk>m
} 9J*m!-hOY
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public PaginationSupport findPageByCriteria W%)
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(final DetachedCriteria detachedCriteria){ Bx2E9/S3
return findPageByCriteria }wz )"
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); LKtr>u
} pz~AsF
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public PaginationSupport findPageByCriteria g;Bq#/w
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(final DetachedCriteria detachedCriteria, finalint b>?X8)f2e
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startIndex){ 76(&O
return findPageByCriteria yin"+&<T
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(detachedCriteria, PaginationSupport.PAGESIZE, H;%a1
t: r
startIndex); <5G*#0gw
} i e%ZX
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public PaginationSupport findPageByCriteria 1P@&xcvS\
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(final DetachedCriteria detachedCriteria, finalint O]90F
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pageSize, Z'hW;^e%_z
finalint startIndex){ BB>3Kj:|
return(PaginationSupport) e=QnGT*b5
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getHibernateTemplate().execute(new HibernateCallback(){ mq do@
publicObject doInHibernate JmtU>2z\
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(Session session)throws HibernateException { D\bW' k]!
Criteria criteria = i` n,{{x&4
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detachedCriteria.getExecutableCriteria(session); pu=Q;E_f[
int totalCount = 32:q'
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((Integer) criteria.setProjection(Projections.rowCount M n3cIGL
ts
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()).uniqueResult()).intValue(); 4L(axjMYU
criteria.setProjection Cir==7A0
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(null); \&n]W\
List items = $*{PUj
o
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criteria.setFirstResult(startIndex).setMaxResults ;a*i*{\Rm
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(pageSize).list(); @I_A\ U{
PaginationSupport ps = FU E/uh
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new PaginationSupport(items, totalCount, pageSize, {|O8)bW'
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{j2e
startIndex); %
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return ps; r*OSEzGUz
} y9?B vPp+
}, true); o5-oQ_j
} !FX;QD@"
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public List findAllByCriteria(final
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DetachedCriteria detachedCriteria){ C7[_#1Oz
return(List) getHibernateTemplate TwqyQ49
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().execute(new HibernateCallback(){ &gw. &/t
publicObject doInHibernate z;xp1t@
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(Session session)throws HibernateException { ;^^u _SuH
Criteria criteria = u`xmF/jhQ
7
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detachedCriteria.getExecutableCriteria(session); F<M#T
return criteria.list(); ;$wS<zp6
} ) ^'Q@W
}, true); !;x
} T2AyQ~5~
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public int getCountByCriteria(final P>+{}c}3I
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DetachedCriteria detachedCriteria){ 3?|Fn8dQR.
Integer count = (Integer) T2P0(rEz
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getHibernateTemplate().execute(new HibernateCallback(){ bN`oQ.Z 4
publicObject doInHibernate hWfJh0I
rW0# 6
(Session session)throws HibernateException { . p^='Kz?
Criteria criteria = I3uaEv7OZc
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detachedCriteria.getExecutableCriteria(session); d+[yW7%J
return Mc#uWmc 7
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criteria.setProjection(Projections.rowCount 7[rn
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()).uniqueResult(); idMb}fw>
} R] tHd=kf
}, true); R
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return count.intValue();
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} b8P/9D7K?
} /J]Yj,
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用户在web层构造查询条件detachedCriteria,和可选的 =;-/( C
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 \$}xt`6p
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PaginationSupport的实例ps。 `<i|K*u
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ps.getItems()得到已分页好的结果集 "IA[;+_"
ps.getIndexes()得到分页索引的数组 $v#Q'?jE
ps.getTotalCount()得到总结果数 JR|yg=E
ps.getStartIndex()当前分页索引 D|/Azy.[
ps.getNextIndex()下一页索引 A)Wp W M
ps.getPreviousIndex()上一页索引 "#z4
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mf=, 6fx28
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 kbJ/7
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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 v%n'_2J =^
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一下代码重构了。 W?mn8Y;{`
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我把原本我的做法也提供出来供大家讨论吧: %_;q<@9)
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首先,为了实现分页查询,我封装了一个Page类: m8,P-m
java代码: H_sLviYLu
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/*Created on 2005-4-14*/ 1dh_"/
package org.flyware.util.page; I~H:-"2
pXL_`=3Q
/** ;29q
* @author Joa !SEHDRp
* $'btfo4H
*/ LbOjKM^-
publicclass Page { wUHuykF
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/** imply if the page has previous page */ S!A)kK+
privateboolean hasPrePage; 3.U5Each-
zB/$*Hd
/** imply if the page has next page */ sJg-FVe2
privateboolean hasNextPage; *q_
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/** the number of every page */ 3GUO
privateint everyPage; u6IEBYG ((
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/** the total page number */ 9#{?*c6
privateint totalPage; p/>}{Q )Y
wcUf?`21,
/** the number of current page */ RKFj6u
privateint currentPage; 7\@[e, ^9
hu%rp{m^,
/** the begin index of the records by the current cG1-.,r
a97A{7I&
query */ [_*%
privateint beginIndex;
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pm$,B7Q`oO
/** The default constructor */ P0uUVU=B|
public Page(){ Sq8 `)$\
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} L3iYZ>]
jv<BGr=4;
/** construct the page by everyPage O&!>C7
* @param everyPage S~0 mY}
m
* */ /*!K4)$-*2
public Page(int everyPage){ w^e<p~i!^E
this.everyPage = everyPage; 9Slx.9f
} -'3~Y
2#
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/** The whole constructor */ Q+'mBi}
public Page(boolean hasPrePage, boolean hasNextPage, +!Q <gWb
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int everyPage, int totalPage, fw kX-ON
int currentPage, int beginIndex){ $HT
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this.hasPrePage = hasPrePage; e84[B.
this.hasNextPage = hasNextPage;
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this.everyPage = everyPage; `VY -3
this.totalPage = totalPage; bDVz+*bU}
this.currentPage = currentPage; ++D-,>.
this.beginIndex = beginIndex; $50A!h
} e}Cp;c]=
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/** H(9%SP@[c
* @return GhpVi<FL
* Returns the beginIndex. lgFA}p@
*/ 7.-Q9xv
publicint getBeginIndex(){ yM>:,T S
return beginIndex; QxG:NN;jW
} }wRHNBaEB
pYIm43r H
/** 1^^<6e
* @param beginIndex V`qHNM/t
* The beginIndex to set. iV;X``S
*/ !4TM gM
publicvoid setBeginIndex(int beginIndex){ mu`h6?v
this.beginIndex = beginIndex; C"no>A^
} udVEOn$
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/** tQE=c7/M
* @return 9gR@Q%b)
* Returns the currentPage. 1eQa54n
*/ C1_':-4
publicint getCurrentPage(){ B
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return currentPage; hvCX,^LoJ
} E uxD,(
s"*ZQ0OaD
/** 8$9<z
* @param currentPage ?CIMez(h
* The currentPage to set. F33&A<(,
*/ ={ P
publicvoid setCurrentPage(int currentPage){ 78&(>8@m
this.currentPage = currentPage; HLm6BtE
} ]FV,}EZ
k)j,~JH
/** W@U<GF1
* @return w:%3]2c
* Returns the everyPage. `%_ yRJd|;
*/ 60p*$Vqy
publicint getEveryPage(){ h^o>9s/|/H
return everyPage; |^p7:)cy
} L5$r<t<
:4RD.l
/** N T+%u-
* @param everyPage 2k}~"!e1
* The everyPage to set. yop,%Fe
*/ Ve\^(9n
publicvoid setEveryPage(int everyPage){ 'jh9n7mH
this.everyPage = everyPage; -DD2
} /NRdBN
L-Qc[L
/** nv>|,&;
* @return j_L1KB*
* Returns the hasNextPage. C3 >X1nU
*/ 9XtR8MH
publicboolean getHasNextPage(){ I-oY@l`
return hasNextPage; pIcvsd
} HUUN*yikj
&("HH"!
/** D >ax<t1K
* @param hasNextPage #mu3`,9V
* The hasNextPage to set. 2_i/ F)W
*/ P X/{
publicvoid setHasNextPage(boolean hasNextPage){ 5WJof`M
this.hasNextPage = hasNextPage; +b@KS"3h
} !Ab4'4f
oAaUXkQE
/** qy@v,a
* @return /S9s%scAy
* Returns the hasPrePage. ]6JI((
*/ JBzRL"|
publicboolean getHasPrePage(){ G-FeDP
return hasPrePage; 5X"y46i,H
} i$`OOV=/e
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/** #r{`Iv?nn
* @param hasPrePage c*F'x-TH
* The hasPrePage to set. C'5b)0km
*/ xF|P6GXg
publicvoid setHasPrePage(boolean hasPrePage){ *\W
*,D.I
this.hasPrePage = hasPrePage; .CU~wB@h
} 7O)j]eeoL
[fVtQ@-S!
/** E(t:F^z&D
* @return Returns the totalPage. MPSoRA: h
* %K@s0uQ
*/ bWp40&vx
publicint getTotalPage(){ ynkPI6o
return totalPage; J*4byu|
} }M_Yn0(3
Wk3R6
V
/** MZ9{*y[z
* @param totalPage N0U6N< w
* The totalPage to set. T\}?
*/ 2AN6(k4o
publicvoid setTotalPage(int totalPage){ s^O>PEX&<I
this.totalPage = totalPage; E<=h6Ha
} x.gRTR`7(
M? 7CBqZ
} 1E3'H7k\t
BEU^,r3z
2Mqac:L
"Yh[-[,
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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 ~n)gP9Hv
WsHC%+\'
个PageUtil,负责对Page对象进行构造: `8 Q3=^)3
java代码: gD$bn=
x !)[l;
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/*Created on 2005-4-14*/ R
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package org.flyware.util.page; XLG6f(B= F
{~cG'S Y%
import org.apache.commons.logging.Log; z'iAj
import org.apache.commons.logging.LogFactory; Gvo|uB#
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/** BNA` Cc1VV
* @author Joa YGAB2`!U
* zpPzXQv]/
*/ i^Ba?r;*
publicclass PageUtil { Kterp%J?
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privatestaticfinal Log logger = LogFactory.getLog l;u_4`1H
MqA%hlq
(PageUtil.class); |ji={
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/** bKAR}JM&
* Use the origin page to create a new page 6x6xv:\
* @param page c UJUZ@ol
* @param totalRecords o>3g<-ul
* @return #HgXTC
*/ oh>X/uj
publicstatic Page createPage(Page page, int kqyVUfX$3
)Fa6'M
totalRecords){ C3m](%?
return createPage(page.getEveryPage(), +i %,+3#6
u<}PcI.
page.getCurrentPage(), totalRecords); ux8:
} HTpoYxn(
*ud"?{)Z
/** lQt&K1m
* the basic page utils not including exception jg,oGtRz
dV~yIxD}C*
handler T[$! ^WT
* @param everyPage CO+[iJ,4C+
* @param currentPage #zRT
* @param totalRecords ,F4_ps?(
* @return page qa|"kRCO
*/ VW,"
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publicstatic Page createPage(int everyPage, int ]yR0"<W^xO
'Dh+v3O
currentPage, int totalRecords){ xKol
everyPage = getEveryPage(everyPage); h[Hn*g
currentPage = getCurrentPage(currentPage); jsXj9:X I
int beginIndex = getBeginIndex(everyPage, 83^|a5
zAr@vBfC%
currentPage); vmV<PK-
int totalPage = getTotalPage(everyPage, Glt%%TJb
KINKq`Sx
totalRecords); GpW5)a
boolean hasNextPage = hasNextPage(currentPage, >Ei-Spy>Xl
#7wOr78
totalPage); #fF~6wopV
boolean hasPrePage = hasPrePage(currentPage); zmREzP#X
uTSTBI4t
returnnew Page(hasPrePage, hasNextPage, ao@"j}c
everyPage, totalPage, .H.#W1`
currentPage, {nl]F
X={n9*Sd8
beginIndex); c5 jd
q[0
} xe4F4FC'
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privatestaticint getEveryPage(int everyPage){ D$
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return everyPage == 0 ? 10 : everyPage; vCPiT2G
} <Z8I#IPl
;OE= ;\
privatestaticint getCurrentPage(int currentPage){ Q%x |
return currentPage == 0 ? 1 : currentPage; 3A~53W$M
} n'dxa<F2|
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privatestaticint getBeginIndex(int everyPage, int 3I rmDT
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currentPage){ *2$I,
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return(currentPage - 1) * everyPage; <