Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 2+o|A
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 k(%QIJH
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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 HKO739&n}
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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 p?X02
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分页支持类: _qXa=|}V.
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java代码: bEV<iZDq%
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package com.javaeye.common.util; N_Akmh0D
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import java.util.List; oU6y4yO
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publicclass PaginationSupport { ]bi)$j.9s
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publicfinalstaticint PAGESIZE = 30; SP]IUdE\
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privateint pageSize = PAGESIZE; o4b~4h{%
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privateList items; nqVZqX@oE
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privateint totalCount; 8>WVodv
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privateint[] indexes = newint[0]; )yK[ Zb[
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privateint startIndex = 0; 4Kwh?8.
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public PaginationSupport(List items, int f:B>zp;N
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totalCount){ 5kNzv~4B,;
setPageSize(PAGESIZE); SLfFqc+n0
setTotalCount(totalCount); 'CZa3ux
setItems(items); X|D!VX>#!
setStartIndex(0); l`-bFmpA
} u{N,Ib
8
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public PaginationSupport(List items, int h].~# *
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totalCount, int startIndex){ `(6r3f~XJ
setPageSize(PAGESIZE); G rmzkNlN
setTotalCount(totalCount); kql0J|P?
setItems(items); Sn4[3JV $l
setStartIndex(startIndex); )u]9193
} NcPgq?3p
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public PaginationSupport(List items, int ig LMv+{
}N0Qm[R
totalCount, int pageSize, int startIndex){ PQKaqv}N
setPageSize(pageSize); Cxod[$8
setTotalCount(totalCount); z7M_1%DEx
setItems(items); .\0isO
setStartIndex(startIndex); W|:lVAP.|}
} hI?sOR!
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publicList getItems(){ fb~=Y$|
return items; p[lNy{u~M
} $;M:TpX
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publicvoid setItems(List items){ r0d35
this.items = items; ~_IHaw$hg
} RB* J=
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publicint getPageSize(){ Ch$*Gm19Z
return pageSize; jcNT<}k
C
} 'I;!pUfVp
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publicvoid setPageSize(int pageSize){ ]lw|pvtd
this.pageSize = pageSize; AcI,N~~
} VvFC -r,=G
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publicint getTotalCount(){
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return totalCount; ;,i]w"*
} i
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publicvoid setTotalCount(int totalCount){ 5zFR7/p{
if(totalCount > 0){ dVB~Smsr
this.totalCount = totalCount; "s!7dKXI"
int count = totalCount / <<=WY_m}
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pageSize; D`J6h,=2l/
if(totalCount % pageSize > 0) J_Ltuso
count++; #ET/ =
indexes = newint[count]; 8]4U`\k4
for(int i = 0; i < count; i++){ 6 3`{.yZ*z
indexes = pageSize * V-n&oCS+f
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} 2C{H$
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}else{ U9D!GKVp
this.totalCount = 0; ?(*t@
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} E*L iM5+I
} "&+"@<
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publicint[] getIndexes(){ n,$IfC"
return indexes; `n$5+a+
} lWBb4 !l
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publicvoid setIndexes(int[] indexes){ mUS_(0q
this.indexes = indexes; OHiQ7#y
} w
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publicint getStartIndex(){ ^rvx!?zO
return startIndex; >.dWjb6t
} vSi_t
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publicvoid setStartIndex(int startIndex){ zC_<(4$-"
if(totalCount <= 0) s
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this.startIndex = 0; >``MR%E:<
elseif(startIndex >= totalCount) ~QvqG{bFB
this.startIndex = indexes "\0v,!@
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[indexes.length - 1]; /mp*>sNr6
elseif(startIndex < 0) 5M9 I,
this.startIndex = 0; oB74y
else{ JaB<EL-9r2
this.startIndex = indexes Gmf B
[<'-yQ{l\
[startIndex / pageSize]; ~ek$C
} z<B8mB
} `--TP
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publicint getNextIndex(){ ~z" =G5|
int nextIndex = getStartIndex() + ?c0xRO%y
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pageSize; JK.ZdY%
if(nextIndex >= totalCount) ^"J8r W6[
return getStartIndex(); QWMdn
else \GHiLs,!
return nextIndex; =gcM%=*'
} Sm~l:v0%
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publicint getPreviousIndex(){ 2h[85\4
int previousIndex = getStartIndex() - 0P\$2lk
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pageSize; P-ri=E}>
if(previousIndex < 0) TDd{.8qf
return0; 6xD#?
else hEh}PX:
return previousIndex; w`q%#qRk
} /z BxJT0
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} meOMq1
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抽象业务类 6;|n]m\Vd
java代码: ]O]GeAGC2
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/** Yv:55+ e!|
* Created on 2005-7-12 J/}:x;Y
*/ ~#kT_*sw)
package com.javaeye.common.business; h,Q3oy\s1
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import java.io.Serializable; d>{nQF;c
import java.util.List; 44-R!
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import org.hibernate.Criteria; 3> Y6)
import org.hibernate.HibernateException; gks{\ H]
import org.hibernate.Session; o1<_fI
import org.hibernate.criterion.DetachedCriteria; hGiz)v~
import org.hibernate.criterion.Projections; b, :QT~g=
import ~i `>adJ:
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org.springframework.orm.hibernate3.HibernateCallback; |Pg@M
import {#)0EzV6
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org.springframework.orm.hibernate3.support.HibernateDaoS Nj?/J47?,
qu|B4?Y/CR
upport; .|/~op4;
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import com.javaeye.common.util.PaginationSupport; #lkM=lY'
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public abstract class AbstractManager extends QcgfBsv96
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HibernateDaoSupport { !E T~KL!
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privateboolean cacheQueries = false; K# Jk _"W
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privateString queryCacheRegion; e@IA20
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publicvoid setCacheQueries(boolean }Q";aU0^
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cacheQueries){ *6} N =Z
this.cacheQueries = cacheQueries; hcyM6:}
} /c,(8{(O
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publicvoid setQueryCacheRegion(String Dq)j:f#QM
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queryCacheRegion){ U4cY_p?
this.queryCacheRegion = z@w Mc
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queryCacheRegion; og0*Nt+
} *W
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publicvoid save(finalObject entity){ V
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getHibernateTemplate().save(entity); aJcf`<p
} 7PkJ-JBA
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publicvoid persist(finalObject entity){ 2z|*xS'G
getHibernateTemplate().save(entity); u?+Kkkk
} EI^06q4x
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publicvoid update(finalObject entity){ H=\3Jj(4
getHibernateTemplate().update(entity); (7 r<''
} &-mX ,
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publicvoid delete(finalObject entity){ HcqfB NM
getHibernateTemplate().delete(entity); lIProF0
} Jej` ;I
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publicObject load(finalClass entity, AGbhJ=tB
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finalSerializable id){
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return getHibernateTemplate().load 'z$Q rFW
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(entity, id); 4 M(-xl?
} #H0dZ.$b0
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publicObject get(finalClass entity, R~ZFy0
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finalSerializable id){ KhMSL
return getHibernateTemplate().get _N@ro
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(entity, id); nH<eR)0
} rs~wv('
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publicList findAll(finalClass entity){ Z"AQp _
return getHibernateTemplate().find("from rSJ9v:
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" + entity.getName()); d`F&aC
} }6@pJG
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publicList findByNamedQuery(finalString c.j$9=XLBG
,JEFGI{
namedQuery){ p8]68!=W\F
return getHibernateTemplate beu\cV3
}5(Ho$S(
().findByNamedQuery(namedQuery); HTyLJe
} vo#UtN:q
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publicList findByNamedQuery(finalString query, ph-ATJ"
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finalObject parameter){ %Jrt4sg[j-
return getHibernateTemplate Mv6-|O
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().findByNamedQuery(query, parameter); L*~J%7
} 19j+lCSvH
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publicList findByNamedQuery(finalString query, T16{_
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finalObject[] parameters){ jb^N|zb
return getHibernateTemplate oDU ;E
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().findByNamedQuery(query, parameters); mzf+Cu:`v
} k0Uyf~p~
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publicList find(finalString query){ iV eC=^1
return getHibernateTemplate().find (4Zts0O\
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(query); 7K5P8N
,
} P`e!Z:
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publicList find(finalString query, finalObject FGh]S-A
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parameter){ nVI!@qW
return getHibernateTemplate().find E,f>1meN=
T"0,r$3:
(query, parameter); L_K=g_]
} $.[#0lCI
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public PaginationSupport findPageByCriteria a@0BBihz
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(final DetachedCriteria detachedCriteria){ =F;.l@:
return findPageByCriteria :bC40@
Z>^pCc\lH
(detachedCriteria, PaginationSupport.PAGESIZE, 0); YR;^hs?
} <E0UK^-}
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public PaginationSupport findPageByCriteria J|w)&bV
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(final DetachedCriteria detachedCriteria, finalint {Pc<u
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startIndex){ ]| +<P-
return findPageByCriteria jWYV#ifs2
n2IV2^ "
(detachedCriteria, PaginationSupport.PAGESIZE, 17OH]
4~N[%>zJ
startIndex); C|o`k9I#
} S*,rGCt'T
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public PaginationSupport findPageByCriteria ]Qe{e3p;
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(final DetachedCriteria detachedCriteria, finalint w-0mzk"
q=9`06
pageSize, {pHM},WJ
finalint startIndex){ dS5a
return(PaginationSupport) *<u2:=_s
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getHibernateTemplate().execute(new HibernateCallback(){ "^1L'4'S
publicObject doInHibernate Y}vr>\
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(Session session)throws HibernateException { uSR~@Lj ~
Criteria criteria = tyDM'|p
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detachedCriteria.getExecutableCriteria(session); I'@Ydt2
int totalCount = Q(\4]i< S
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((Integer) criteria.setProjection(Projections.rowCount kWrp1`
e~"fn*"
()).uniqueResult()).intValue(); uZ=NSbYsA
criteria.setProjection H/"lAXfb
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(null); 3dDX8M?
List items = ]$,UPR/3
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criteria.setFirstResult(startIndex).setMaxResults m{7(PHpw
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(pageSize).list(); \~5C7^_
PaginationSupport ps = jH6&q~#
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new PaginationSupport(items, totalCount, pageSize, @ G4X
Q[d}J+l4{
startIndex); A.5i"Ci[ie
return ps; +/ &_v^sC;
} "$}vP<SM
}, true); "XT"|KF|D
} 1\r|g2Z
:
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public List findAllByCriteria(final >X51$wBL
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DetachedCriteria detachedCriteria){ BY]i;GVq
return(List) getHibernateTemplate p^pOuy8
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().execute(new HibernateCallback(){ IO/4.m-aN#
publicObject doInHibernate YOJ6w
}`NU@O#
(Session session)throws HibernateException { [S@}T
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Criteria criteria = 0V!l,pg
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detachedCriteria.getExecutableCriteria(session); JXj8Br?Z@
return criteria.list(); DU=dLE6-P;
} >pr=|$zk=
}, true); 36n>jS&
} sIv)'
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public int getCountByCriteria(final 7^Yk`Z?|a
wm+})SOX9
DetachedCriteria detachedCriteria){ Rtjqx6-B;
Integer count = (Integer) I=!rbF;Z
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getHibernateTemplate().execute(new HibernateCallback(){ +GAf O0
publicObject doInHibernate "rAY.E]
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(Session session)throws HibernateException { VG>vn`x>a
Criteria criteria = Ve/xnn]'
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detachedCriteria.getExecutableCriteria(session); x[Wwq=~
return OK{xuX8u
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criteria.setProjection(Projections.rowCount w\19[U3
g5q$A9.Jl
()).uniqueResult(); 0W%@gs5d&
} > MH(0+B*
}, true); E~kG2x{a
return count.intValue(); $.:mai
} W k}AmC
} X.TI>90{
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)}L??|#
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用户在web层构造查询条件detachedCriteria,和可选的 ~j'l.gQb
"p3_y`h6+
startIndex,调用业务bean的相应findByCriteria方法,返回一个 9TAj) {U%'
v{<[)cr
PaginationSupport的实例ps。 P5gN #G
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ps.getItems()得到已分页好的结果集 DE
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ps.getIndexes()得到分页索引的数组 emW:C-/h/@
ps.getTotalCount()得到总结果数 v~/~@jv
ps.getStartIndex()当前分页索引 g_Im;1$
ps.getNextIndex()下一页索引 =@)d5^<5F
ps.getPreviousIndex()上一页索引 wIf
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5%}wV,Y
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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 "EV!>^Z
dC<LDxlv
一下代码重构了。 gf+d!c(/
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我把原本我的做法也提供出来供大家讨论吧: c={Ft*N
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首先,为了实现分页查询,我封装了一个Page类: 2Cg$,#H
java代码: 4m-I5!=O
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U,Mx@KdV
/*Created on 2005-4-14*/ D?M!ra
package org.flyware.util.page; xE-7P|2
*XWq?hi
/** aTzDew
* @author Joa -@&1`@):{
* 6/ `.(fL1
*/ <:|3rfm#
publicclass Page { {k(eNr,
;
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/** imply if the page has previous page */ ^S#t|rN
privateboolean hasPrePage; G9g6.8*&
},[;O^Do^{
/** imply if the page has next page */ /VHi>
privateboolean hasNextPage; H UWxPIu
.C]cK%OO
N
/** the number of every page */ 3^=+gsc
privateint everyPage; jKIc09H|
bqx0d=Z~[
/** the total page number */ l?*r5[O>n
privateint totalPage; ZlKw_Sq:
W@\ (nfD2
/** the number of current page */ MK}-<&v
privateint currentPage; z{]?h cY
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/** the begin index of the records by the current #hw/^AaD-
+' oX
query */ IK^~X{I?
privateint beginIndex; 7L:7/
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/** The default constructor */ AAUyy
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public Page(){ q1k{
_w ]4~V9
} YH:8<O,{-
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/** construct the page by everyPage $A<ESfrs
* @param everyPage PKq-@F%X
* */ 8X&Ya =
public Page(int everyPage){ "?.~/@
this.everyPage = everyPage; <1~^C
} %"A_!<n@*`
[{&jr]w`|
/** The whole constructor */ q\9d6u=Gm
public Page(boolean hasPrePage, boolean hasNextPage, I]}>|
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}PeZO!K
int everyPage, int totalPage, ,,=apyr#&
int currentPage, int beginIndex){ sP$Ks#/
this.hasPrePage = hasPrePage; "t(wG{RxY
this.hasNextPage = hasNextPage; 2}t&iG|0/
this.everyPage = everyPage; Ov9Q?8KzM
this.totalPage = totalPage; _ :^7a3I
this.currentPage = currentPage; w36(p{#vp
this.beginIndex = beginIndex; w>~M}Ahj
} D!TZI
l*7?Y7FK
/** +'03>!V
* @return J7i+c];!<
* Returns the beginIndex. g.Hio.fVd
*/ :wgfW .w
publicint getBeginIndex(){ -g`IH-B
return beginIndex; Q* O<@
} v@u<Ww;=@
O%1/r*
/** q'(z #h,cv
* @param beginIndex {)K](S
~
* The beginIndex to set. ^i_Iqph=
*/ {8NwFN.
publicvoid setBeginIndex(int beginIndex){ eXy"^xp^
this.beginIndex = beginIndex; XrN- 2HTV
} B/eaqJ
PCfo
/** :mv`\
* @return _dU P7H (
* Returns the currentPage. \3PE+$
*/ cBEHH4U
publicint getCurrentPage(){ -p#,5}
return currentPage; h{]#ag5`
} 3x5!a5$Y
%AR^+*Nu
/** %%g-GyP
1
* @param currentPage {K7YTLWY
* The currentPage to set. 0rzVy/Z(
*/ _ 6:ww/
publicvoid setCurrentPage(int currentPage){ %cW;}Y[?P
this.currentPage = currentPage; J4yt N3
} QB1M3b
Q_}/ Pn$1
/** ; Zq/eiB
* @return }e=e",eAT
* Returns the everyPage. 5()Fvae{k
*/ k90B!kg
publicint getEveryPage(){ y(8d?]4:_
return everyPage; &:!ij
} Hq
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*W^=XbG
/** 8B@JFpg^
* @param everyPage #/WAzYt{
* The everyPage to set. A8dI:E+$
*/ 8wF#e\Va0
publicvoid setEveryPage(int everyPage){ &=-PRza%j
this.everyPage = everyPage; o'qm82*
=
} vR]mSX3)?
u@D.i4U
/** k!E"wJkpz
* @return F";FG 0
* Returns the hasNextPage. $!`L"szqD*
*/ 5G?.T?
publicboolean getHasNextPage(){ W/v|8-gcK
return hasNextPage; `s}BXKIv}
} "T*I|
aJ2H.E
/** wD=am
* @param hasNextPage R{<Y4C2~
* The hasNextPage to set. BLW]|p|1:
*/ ]p$zvMf}
publicvoid setHasNextPage(boolean hasNextPage){ z~.9@[LG]
this.hasNextPage = hasNextPage; 5<N~3
1z
} +k
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l10-XU02
/** *g$agyOfh
* @return v&2+'7]w
r
* Returns the hasPrePage. 'rx?hL3VW
*/ 8vJdf9pB*
publicboolean getHasPrePage(){ m"-G6BKS
return hasPrePage; :r39wFi
} l;5`0N?QO
}jcIDiSu
/** Opry`}5h
* @param hasPrePage CZfE
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* The hasPrePage to set. b"P&+c
*/ a4u ^f5)@
publicvoid setHasPrePage(boolean hasPrePage){ s]bPV,"p
this.hasPrePage = hasPrePage; AP
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} ~R{8.!: >
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/** k5s ?lWH
* @return Returns the totalPage. Nu+wL>t
* qT0_L
*/ YZ*{^'
publicint getTotalPage(){ qvTJ>FILT
return totalPage; lWlUWhLnP
} jZ/+~{<
0s!N@ ,T
/** ux&:Rw\
* @param totalPage ) MBS
* The totalPage to set. k.{G&]r{
*/ M8Juykw
publicvoid setTotalPage(int totalPage){ gA:[3J,[;
this.totalPage = totalPage; CK Mv7
} Z^+a*^w~{
U IQ 6SvM
} K#;txzi
)"-fHW+fy
)rbc;{.
r\bq[9dX>
]
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 7%YYr^d
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个PageUtil,负责对Page对象进行构造: sZEgsrJh
java代码: gDj_KKd
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1:YAn
/*Created on 2005-4-14*/ hy=u}^F.C
package org.flyware.util.page; 8L{$v~ +
b_l.QKk
import org.apache.commons.logging.Log; cUNGo%Y
import org.apache.commons.logging.LogFactory; *G9
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/** Hp*gv/0
* @author Joa Es~DHX
* >& [3
*/ Q~h6J*
publicclass PageUtil { QglYU
?d#Lr*m
privatestaticfinal Log logger = LogFactory.getLog `:R-[>5P8
?.~]mvOR
(PageUtil.class); bWUS9WT
sxt`0oE
/** R;.d/U|av
* Use the origin page to create a new page 9g4QVo|
* @param page jvWI_Fto
* @param totalRecords 7Qt2gf
* @return FQQ@kP$.
*/ `TAcZl=8
publicstatic Page createPage(Page page, int =;g= GcVK
4%%B0[Wo_O
totalRecords){ Xv8fPP(
return createPage(page.getEveryPage(), uH0#rgKt
i@Vs4E[b
page.getCurrentPage(), totalRecords); U* 4{"
} &1oaZY w
o;*]1
/** 9ec0^T
* the basic page utils not including exception .r(^h/IF
h1E
PaL
handler 2[XltjO
* @param everyPage
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* @param currentPage BZ2nDW*%
* @param totalRecords l~ CZW*/
* @return page {$3j/b
*/ JUmw$u
publicstatic Page createPage(int everyPage, int Ko]QCLL
8>2&h
currentPage, int totalRecords){ ws.?cCTpt
everyPage = getEveryPage(everyPage); "h QV9 [2\
currentPage = getCurrentPage(currentPage); S ]vW&r3`
int beginIndex = getBeginIndex(everyPage, 6xyY+
FBYll[8
currentPage); )K8P+zn~
int totalPage = getTotalPage(everyPage, ]DGGcUk7
F
ZM2
totalRecords); C+T&O
boolean hasNextPage = hasNextPage(currentPage, qjJ{+Rz2
$+0=GN
totalPage); lGl[^
0
boolean hasPrePage = hasPrePage(currentPage); `!] R!T@C
4n#YDZ
returnnew Page(hasPrePage, hasNextPage, G]1(X38[si
everyPage, totalPage, E`Q;DlXv>
currentPage, 7&=-a|k~
p| Vmdnb
beginIndex); ;HR 6X
} VjC*(6<Gj
te4F"SEf
privatestaticint getEveryPage(int everyPage){ /A0 [_
return everyPage == 0 ? 10 : everyPage; h=!M6yap<
} 2%`^(\y
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privatestaticint getCurrentPage(int currentPage){ wwo(n$!\
return currentPage == 0 ? 1 : currentPage; j!6elzg
} n9N#&Q"7m
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privatestaticint getBeginIndex(int everyPage, int 'y'T'2N3
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currentPage){ [0h* &
return(currentPage - 1) * everyPage; xi;/^)r
} U? {'n#n 5
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privatestaticint getTotalPage(int everyPage, int lv=yz\
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totalRecords){ q-A`/9
int totalPage = 0; ~8XX3+]z:X
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if(totalRecords % everyPage == 0) vsu@PuqH
totalPage = totalRecords / everyPage; x%_qJ]o
else oNiToFbQu
totalPage = totalRecords / everyPage + 1 ; : =
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return totalPage; s"pR+)jf1D
} |\i:LG1
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privatestaticboolean hasPrePage(int currentPage){ -iY9GN89c
return currentPage == 1 ? false : true; }pbBo2
} ^2C0oX
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privatestaticboolean hasNextPage(int currentPage, x>U1t!'
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int totalPage){ z\xiACIc
return currentPage == totalPage || totalPage == D?iy.Dg
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0 ? false : true; fO[Rf_
} Cf.pTYSl
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} $
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9
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N>uA|<b,
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。 S^3g]5YX
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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 0ClX
uAW*5 `[
做法如下: u5u0*c
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 B, QC-Tn
A8_\2'b
的信息,和一个结果集List: kS@9c _3S
java代码: I>A^5nk
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/*Created on 2005-6-13*/ )ZS:gD
package com.adt.bo; K*([9VZ
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import java.util.List; QVnO
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import org.flyware.util.page.Page; &