Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 DO*C]
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 745PCC'FK
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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 ~DS9{Y
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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 e=$xn3)McY
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分页支持类: 66;O 3g'
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java代码: e/%YruzS
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package com.javaeye.common.util; X0L{#U
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import java.util.List; KPrxw }P
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publicclass PaginationSupport { `{;&Qcg6m
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publicfinalstaticint PAGESIZE = 30; uvd>
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privateint pageSize = PAGESIZE; <\
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privateList items; 1EzA@3:{
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privateint totalCount; LLN^^>5|l
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privateint[] indexes = newint[0]; N_}Im>;!
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privateint startIndex = 0; ~|]\.^B
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public PaginationSupport(List items, int %ua5T9H Z
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totalCount){ xrd^vE
setPageSize(PAGESIZE); ,X):2_m
setTotalCount(totalCount); < duM8
setItems(items); *Ux"3IXO
setStartIndex(0); 1 .CYs<
} G9%4d;uFT
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public PaginationSupport(List items, int zh#uwT1u
I#%-A
totalCount, int startIndex){ I<f M8t.Y>
setPageSize(PAGESIZE); >eI(M $
setTotalCount(totalCount); epe}^Pl
setItems(items); h{9pr
setStartIndex(startIndex); JE!Xf}nEi
} (CwaOm{g
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public PaginationSupport(List items, int /zAx`H
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totalCount, int pageSize, int startIndex){ Wb$bCR#?<
setPageSize(pageSize); `UPmr50Wq
setTotalCount(totalCount); 3iwZUqyq
setItems(items); 7?@v}%w
setStartIndex(startIndex); M1\/ueOe
} cQb%bmBc5
h<q``hn>
publicList getItems(){ T!r7RS
return items; T9yW# .
} %UhF=C
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publicvoid setItems(List items){ s"Wdbw(O '
this.items = items; jiDYPYx;I
} \U8Vsx1tl
U^I'X7`r
publicint getPageSize(){ fx5vaM!
return pageSize; pj`-T"Q
} pDT6>2t
xR3A4m
publicvoid setPageSize(int pageSize){ nXjUTSGa)
this.pageSize = pageSize; `MS=/x E
} HF:PF"|3
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publicint getTotalCount(){ J.(_c'
r
return totalCount; ,GlK_-6>
} Q2uE_w`B
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publicvoid setTotalCount(int totalCount){
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if(totalCount > 0){ *!kg@ _0K
this.totalCount = totalCount; sa($3`d
int count = totalCount / dE~ns
,+
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pageSize; -0{WB(P
if(totalCount % pageSize > 0) ZVL0S{V-mh
count++; "-oC,;yq
indexes = newint[count]; fyeS)
for(int i = 0; i < count; i++){ ]Ea6Z
indexes = pageSize * .nN7*))Fj
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i; #,Y}
} r` @Dgo}
}else{ IYFA>*Es
this.totalCount = 0; ub&1L_K
} L
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} lHU$A;
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publicint[] getIndexes(){ kW9STN
return indexes; bYfcn]N
} A
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publicvoid setIndexes(int[] indexes){ `:&{/|uP7
this.indexes = indexes; YH9BJ
} KK}&4^q
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publicint getStartIndex(){ 9UZX+@[F
return startIndex; ()Z$j,2
} ]cD!~nJ
4{_5z7ody
publicvoid setStartIndex(int startIndex){ RXDk8)^
if(totalCount <= 0) w,&RHQB
this.startIndex = 0; 7gkHKdJoMA
elseif(startIndex >= totalCount) TBzM~y
this.startIndex = indexes ^AN9m]P
3
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[indexes.length - 1]; jB;+tDC!Co
elseif(startIndex < 0) %AFy{l
this.startIndex = 0; R?(j#bk
else{ 7%tn+
this.startIndex = indexes &fcRVku
Nb6HM~
[startIndex / pageSize]; QB7<$Bp
} {!w]t?h
} l6~eb=u;9g
d@<XR~);
publicint getNextIndex(){ Ok@5`?08
int nextIndex = getStartIndex() + R*U>T$
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pageSize; F{[Q
if(nextIndex >= totalCount) @AwH?7(b
return getStartIndex(); |7 argk+
else 8447hb?W$
return nextIndex; @RC_Ie=#)
} A U](pXK;
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publicint getPreviousIndex(){ @RjLDj+)S
int previousIndex = getStartIndex() - v{9eEk1
O;w';}At
pageSize; n1QO/1}
:
if(previousIndex < 0) >\e11OU0Gy
return0; j<c_*^/'9
else TM+7>a$
return previousIndex; ojaZC,}
} B\Uj
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} ,T]okN5uI
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抽象业务类 UwLa9Dn^
java代码: ;3w W)gL1
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/** ^71sIf;+
* Created on 2005-7-12 )Z62xK2
*/ 9]Y@eRI<
package com.javaeye.common.business; UZyo:*yB
*aSFJK
import java.io.Serializable; {AZW."?
import java.util.List; az w8BK
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import org.hibernate.Criteria; ]8RcZn
import org.hibernate.HibernateException; {h2D}F
import org.hibernate.Session; J~==<?j:
import org.hibernate.criterion.DetachedCriteria; TY?Fs-
import org.hibernate.criterion.Projections; qwN-VCj
import oOuWgr]0
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org.springframework.orm.hibernate3.HibernateCallback; BM3nZ<%3
import z2r{AQ.&
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org.springframework.orm.hibernate3.support.HibernateDaoS NK#f Gz*,(
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upport; G,J$lTX
@Fo0uy\G
import com.javaeye.common.util.PaginationSupport; o/Z?/alt4
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public abstract class AbstractManager extends 6%)dsTAB
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HibernateDaoSupport { 1:8ZS
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privateboolean cacheQueries = false; IkD\YPL;
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privateString queryCacheRegion; [z?<'Tj
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publicvoid setCacheQueries(boolean f;QWlh"9
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cacheQueries){ hse$M\5
this.cacheQueries = cacheQueries; !?]NMf_
} NKRNEq!
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publicvoid setQueryCacheRegion(String gzeG5p
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queryCacheRegion){ GR/
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this.queryCacheRegion = 4-sUy
t;
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queryCacheRegion; O4 [[9
} *vht</?J
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publicvoid save(finalObject entity){ fk=_ Y
getHibernateTemplate().save(entity); ucyxvhH^-
} 0rF{"HM~
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publicvoid persist(finalObject entity){ 2nk}'HBe
getHibernateTemplate().save(entity); pm^[ve
} NKO5c?ds
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publicvoid update(finalObject entity){ pVLfZ?78
getHibernateTemplate().update(entity); )wmXicURC
} XmLHZ,/
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publicvoid delete(finalObject entity){ k{uc%6s
getHibernateTemplate().delete(entity); V0"UFy?i
} JWC{ "6
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publicObject load(finalClass entity, L[D}pL=
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finalSerializable id){ D/rKqPp|!
return getHibernateTemplate().load {um~]
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(entity, id); _ u/N#*D
} *ZAue.
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publicObject get(finalClass entity, ?NJ\l5'
&vo]l~.
finalSerializable id){
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return getHibernateTemplate().get 0Bb amU
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(entity, id); 2UA h^i-^
} BoXQBcG]w
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publicList findAll(finalClass entity){ d.sxB}_O
return getHibernateTemplate().find("from C}%g(YRhb
^~?VD
" + entity.getName()); v:eVK!O
} B]#0]-ua
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publicList findByNamedQuery(finalString \ c9EE-
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namedQuery){ weKwBw
return getHibernateTemplate .(ki(8Z N
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().findByNamedQuery(namedQuery); )FYz*:f>&
} NbSkauF~b
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publicList findByNamedQuery(finalString query, zq8LQ4@ay
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finalObject parameter){ Jr|"` f%V
return getHibernateTemplate >^{}Hjt
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().findByNamedQuery(query, parameter); V_$ BZm%8J
} L6O*aZ|
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publicList findByNamedQuery(finalString query, fMy7pXa_
b~z1%?
finalObject[] parameters){ ,aU_bve
return getHibernateTemplate ^3^n|T7le
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().findByNamedQuery(query, parameters); c\065#f!
} >iDV8y
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publicList find(finalString query){ $b
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return getHibernateTemplate().find N[~RWg
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(query); /z.Y<xOc
} bODCC5yL
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publicList find(finalString query, finalObject !X*+Ct^
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parameter){ l q~^&\_#
return getHibernateTemplate().find oqc89DEbJ
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(query, parameter); qk<(iVUO
} kFg@|#0v9
cQ} ,q+GR~
public PaginationSupport findPageByCriteria kl,I.2-
`qbf_;\
(final DetachedCriteria detachedCriteria){ S-NKT(H)c
return findPageByCriteria s3Pr$h
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Gb4k5jl
} @G@,)`p4?
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public PaginationSupport findPageByCriteria J^m#984
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(final DetachedCriteria detachedCriteria, finalint dkVF
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startIndex){ W2?6f:
return findPageByCriteria /zJDQ'k0
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Q
(detachedCriteria, PaginationSupport.PAGESIZE, 2~h! ouleY
fkbHfBp[(A
startIndex); 1t w>C\
} roSdcQTeT
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public PaginationSupport findPageByCriteria A)/8j2
b{%p
(final DetachedCriteria detachedCriteria, finalint .fY1?$*6c
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pageSize, "%ou'\}
finalint startIndex){ @-qS[bV
return(PaginationSupport) VRV*\*~$
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getHibernateTemplate().execute(new HibernateCallback(){ `K5Lp>=R
publicObject doInHibernate a~ sU
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(Session session)throws HibernateException { pBl'SQccp
Criteria criteria = awxzP*6
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detachedCriteria.getExecutableCriteria(session); K9O%SfshF
int totalCount = xV w9_il2a
5#|D1A
((Integer) criteria.setProjection(Projections.rowCount X$Eg(^L a
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()).uniqueResult()).intValue(); q#s:2#=
criteria.setProjection %Z_/MNI
<q\OREMsq
(null); 69/aP=
List items = HEh,Cf7`'
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criteria.setFirstResult(startIndex).setMaxResults !8YZ;l
k@:M#?(F
(pageSize).list(); Bu_/yKW
PaginationSupport ps = y.vYT{^
^F\RM4|,
new PaginationSupport(items, totalCount, pageSize, l Oxz&m
n@%Q 2_
startIndex); {&7%wZ"t_
return ps; M:TN^ rA|
} 0>{&8:
}, true); Ad7N'1O
} fz>3
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public List findAllByCriteria(final E&>3 {uZI
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DetachedCriteria detachedCriteria){ ]rC2jB\,M
return(List) getHibernateTemplate <KY \sb9
@2(7
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().execute(new HibernateCallback(){ [l#
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publicObject doInHibernate n92*:Y
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(Session session)throws HibernateException { .h c-uaL
Criteria criteria = V Ioqn$
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detachedCriteria.getExecutableCriteria(session); ={~?O&Jh
return criteria.list(); @}K|/
} n0)0"S|y1
}, true); S:5vC{
} vtx3a^
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public int getCountByCriteria(final ~V34j:
py|ORVN(Z
DetachedCriteria detachedCriteria){ z3Id8G&>
Integer count = (Integer) =#=<%HPT
@kh:o\
getHibernateTemplate().execute(new HibernateCallback(){ &<dC3o!
publicObject doInHibernate )}!Z^ND*
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(Session session)throws HibernateException { #Sg< 9xsW
Criteria criteria = [pY1\$,
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detachedCriteria.getExecutableCriteria(session); b6(LoN.
return h95a61a,Vy
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criteria.setProjection(Projections.rowCount 1 sJtkge:
wmV7g7t6
()).uniqueResult(); O~P1d&:L
} xxy
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}, true); };{Qx
return count.intValue(); CU`yi.)T{
} ]9A@iA
} SHow~wxw
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t/$:g9V%FA
VZz>)Kz:
用户在web层构造查询条件detachedCriteria,和可选的 2K:Rrn/cR
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ]&b>P ;j:
u=QG%O#B
PaginationSupport的实例ps。 tRtoA5
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ps.getItems()得到已分页好的结果集 {D{'
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ps.getIndexes()得到分页索引的数组 18eB\4NlD
ps.getTotalCount()得到总结果数 ?zpN09e
ps.getStartIndex()当前分页索引 6lAHB*`
ps.getNextIndex()下一页索引 'G)UIjl
ps.getPreviousIndex()上一页索引 QJ4=*tX)
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 < C1Jim
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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 dy'
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一下代码重构了。 P->.eo#VG
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我把原本我的做法也提供出来供大家讨论吧: bC h
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首先,为了实现分页查询,我封装了一个Page类: Cs2F/M'
java代码: dbsD\\,2%N
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/*Created on 2005-4-14*/ WU+OS(
package org.flyware.util.page; |& Pa`=sp
,9.-A-Yw
/** ix+sT|>
* @author Joa .,*68S0k7
* UFl+|wf
*/ c'}dsq\
publicclass Page { dd-`/A@
\- f^C}m
/** imply if the page has previous page */ &:?2IAe
privateboolean hasPrePage; A(@VjXl
`#3FvP@&
/** imply if the page has next page */ "o}}[hRP
privateboolean hasNextPage; =}K"@5J
Q<O(Ix
/** the number of every page */ $6DA<v^=z
privateint everyPage; &YOks.k
78UE?) X"
/** the total page number */ %0Mvd;#[
privateint totalPage; pd\x^F`sk.
_`~\zzUZ
/** the number of current page */ ZnNl3MKV
privateint currentPage; %] #XI r
SL$ bV2T
/** the begin index of the records by the current H"vkp~u]I
:vXlni7N[M
query */ cCBYM
privateint beginIndex; Hs`j6yuc9
/'QfLW>6
MO%kUq|pg
/** The default constructor */ 231,v,X[
public Page(){ vp4NH]fJ
^~DDl$NH
} #`o]{UfW
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/** construct the page by everyPage a+=.(g
* @param everyPage DFM~jlH
* */ (N^tg8 Z<
public Page(int everyPage){ 6d{&1-@>
this.everyPage = everyPage; (iJ9ekB
} 3aUWQP2
J.Fy0W@+k4
/** The whole constructor */ [4
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public Page(boolean hasPrePage, boolean hasNextPage, PC)aVr?@@
c`O(||UZT
(T|q]29
int everyPage, int totalPage, COc
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int currentPage, int beginIndex){ GyQ9we~
this.hasPrePage = hasPrePage; ~5]%+G
this.hasNextPage = hasNextPage; FNR<=M
this.everyPage = everyPage; m&a 8/5
this.totalPage = totalPage; rWULv
this.currentPage = currentPage; U#6<80Ke
this.beginIndex = beginIndex; <HB@j}qi
} k1E(SXcW9
kK~,?l
/** nm#,oX2C
* @return 60z8U#upM
* Returns the beginIndex. hCpcX"wND
*/ 05ovz
publicint getBeginIndex(){ I[w;soI
return beginIndex; =;(y5c
} o"j$*o=
(~N[j;W,_W
/** B1i&HoGbz
* @param beginIndex "?v{?,@
* The beginIndex to set. _?oofE:{
*/ Z/G?wD|B
publicvoid setBeginIndex(int beginIndex){ D^)?*(
this.beginIndex = beginIndex; !]C=5~BBI
} 8)bqN$*h
UUR+PfY
/** d6f+[<<
* @return ),(HCzK`
* Returns the currentPage. m <'&`B;
*/ <`?V:};Q
publicint getCurrentPage(){ qAW?\*n5N
return currentPage; TD-o-*mO
} v}sk %f
svvl`|n%
/** M2!2J
* @param currentPage i`^[_
* The currentPage to set. 4Kh0evZ
*/ bPA >xAH
publicvoid setCurrentPage(int currentPage){ @0 #JY:"
this.currentPage = currentPage; CmxQb,Ul s
} mX5%6{],
;~-M$a
}4
/** B+2EIaI
* @return @hwe
* Returns the everyPage. sR;u#".
*/ Yfr4<;%
publicint getEveryPage(){ K_ Od u^
return everyPage; %R^*MUTx
} +3[8EM#g
b?K`DUju{0
/** Ctx`b[&KXX
* @param everyPage 5@_kGoqd
* The everyPage to set. '.{_
7U
*/ } fJLY\
publicvoid setEveryPage(int everyPage){ #Q1}h
this.everyPage = everyPage; ):lH
} 26ae|2?
l i)
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/** UY(\T8
* @return F R(k==pZ
* Returns the hasNextPage. hn=tSlte
*/ -*$ s ;G#
publicboolean getHasNextPage(){ Zo<j"FG
return hasNextPage; hQ (84u
} t76B0L{
^X;p8uBo
/** 6aKfcvf &
* @param hasNextPage nc^DFP
* The hasNextPage to set. +_1sFH`
*/ weH3\@
publicvoid setHasNextPage(boolean hasNextPage){ >%H(0G#X
this.hasNextPage = hasNextPage; 2b
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} /B<QYvv
K%ptRj$
/** ~P BJ~j+G
* @return dh_c`{9
* Returns the hasPrePage. ^[6el_mj
*/ ..7"<"uH
publicboolean getHasPrePage(){ ^^B~v<uK
return hasPrePage;
<Hr~|oG
} G!+Mu2
GfV#^qi
/** &grqRt
* @param hasPrePage a}Z+"D
* The hasPrePage to set. 1:!H`*DU&
*/ *yv@B!r
publicvoid setHasPrePage(boolean hasPrePage){ F:og :[
this.hasPrePage = hasPrePage; 01~
nC@;
} SuXeUiK.[
'+\t,>nRkl
/** x~Dj2F ]
* @return Returns the totalPage. JwQ/A[b
* =~>g--^U
*/ WbwwI)1
publicint getTotalPage(){ wC?$P
return totalPage; /gn!="J
} @b!W8c 6
*-*SCA`E^=
/** [RF 6mWQ
* @param totalPage ~jzjJ&O&
* The totalPage to set. k [LV^oEg
*/ Iz[ohn!f
publicvoid setTotalPage(int totalPage){ 6{quO#!
this.totalPage = totalPage; ~ dk9 7Z8
} qw
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~F8xXW0
} pxn@rN#*
!;;7:!)P
< 0YoZSNGj
f]_'icP
0xY</S
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 p zZ+!d
=*R6O,
个PageUtil,负责对Page对象进行构造: _+.JTk
java代码: q~^!Ck+#*
[{`2FR:Cd
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/*Created on 2005-4-14*/ mVFo2^%v
package org.flyware.util.page; BOWBD@y
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import org.apache.commons.logging.Log; bObsj]
import org.apache.commons.logging.LogFactory; Nz}PcWF/
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/** *%Fu/
* @author Joa 5+Ao.3Xn
* #qFY`fVf1
*/ eC94rcb}i{
publicclass PageUtil { S9{A}+"K
jtUqrJFlQ
privatestaticfinal Log logger = LogFactory.getLog &isKU8n
AvPPsN0
(PageUtil.class); OJd/#KFm
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/** +~~2OU L
* Use the origin page to create a new page \VA*3U^@
* @param page h-kmZ<p|^
* @param totalRecords QYi4A"$`
* @return Tw7]
*/ k?$I4&|5Nt
publicstatic Page createPage(Page page, int Cv}^]_`Q
NWP!V@WG
totalRecords){ }=}wLm#&1
return createPage(page.getEveryPage(), |-;VnC&UY
2WTOu x*
page.getCurrentPage(), totalRecords); s_a jA
} \EsT1aT
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/** UOk\fyD2[
* the basic page utils not including exception $
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bAbR0)
handler ,ryL("G
* @param everyPage R1D ;
* @param currentPage u`&lTJgF/O
* @param totalRecords RWGf]V]6
* @return page TDUY& 1[
*/ #q h
,
publicstatic Page createPage(int everyPage, int Io|Du
AL.psw-Il
currentPage, int totalRecords){ !=A;?Kdq
everyPage = getEveryPage(everyPage); IrMB=pWo
currentPage = getCurrentPage(currentPage); i")0 3b
int beginIndex = getBeginIndex(everyPage, 8XG';K_
.r2*tB).
currentPage); 9Msy=qvYG
int totalPage = getTotalPage(everyPage, z~ywFk}KGd
R|v'+bv
totalRecords); H]pI$t3~
boolean hasNextPage = hasNextPage(currentPage, yIrJaS-
eZaSV>27
totalPage); I/%v`[
boolean hasPrePage = hasPrePage(currentPage);
?C#E_
GB35o uE
returnnew Page(hasPrePage, hasNextPage, #c5jCy}n
everyPage, totalPage, N+h05`
currentPage, l?=\9y
jj1\oyQ8
beginIndex); '3Lu_]I-
} OQ7 `n<I<)
m3TR}=n
privatestaticint getEveryPage(int everyPage){ z9*e%$+S
return everyPage == 0 ? 10 : everyPage; :nQlS
} I O:*F0
h%krA<G9
privatestaticint getCurrentPage(int currentPage){ w4vV#C4X
return currentPage == 0 ? 1 : currentPage; T!8^R|!a6
} ](A2,F
9(U
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privatestaticint getBeginIndex(int everyPage, int >WIc"y.
xbm%+
currentPage){ ]S%(l,
return(currentPage - 1) * everyPage; l6y}>]
} W3:Fw6v
nuXL{tg6
privatestaticint getTotalPage(int everyPage, int 0]kKF<s
sl `jovT[Y
totalRecords){ p,goYF??
int totalPage = 0; 0z8?6~M;<
Jsysk $R
if(totalRecords % everyPage == 0) L23}{P
totalPage = totalRecords / everyPage; w?8SQI,~X
else ;~EQS.Qp
totalPage = totalRecords / everyPage + 1 ; d51'[?(
Aj)Q#Fd[
return totalPage; xwf-kwF8^
} nUOi~cs
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