Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $T]1<3\G
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 /KlA7MH 6
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 _lyP7$[:
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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 {&w%3
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分页支持类: AVNB)K"
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java代码: >Z<ym|(T*
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package com.javaeye.common.util; 69yTGUG3
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import java.util.List; xH3SVn(I
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publicclass PaginationSupport { Ra~n:$tg2
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publicfinalstaticint PAGESIZE = 30; t#Yyo$9
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privateint pageSize = PAGESIZE; Arfq
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privateList items; !4.;Ftgjn
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privateint totalCount; Zd~s5
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privateint[] indexes = newint[0]; =7Tbu'O;
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privateint startIndex = 0; o L6[i'H|
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public PaginationSupport(List items, int &[RC 4^;\V
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totalCount){ ax7 M
setPageSize(PAGESIZE); nR"k%$
setTotalCount(totalCount); 6LvUi|~"<
setItems(items); i1aS2gFi_
setStartIndex(0); 7Dm^49H
} _Q.3X[88C
8
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public PaginationSupport(List items, int L/<Up
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totalCount, int startIndex){ -t*C-C'"|
setPageSize(PAGESIZE); y)(SS8JR
setTotalCount(totalCount); {MYlW0)~
setItems(items); vO4
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setStartIndex(startIndex); DC/CUKE.d
} 2M1yw "
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public PaginationSupport(List items, int %
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totalCount, int pageSize, int startIndex){ >O\-\L
setPageSize(pageSize); P<2yCovn`
setTotalCount(totalCount); c+4SGWmO
setItems(items); GD< Afni
setStartIndex(startIndex); \nxt\KD
} a o7|8[
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publicList getItems(){ "aa6W
return items; W%1fm/G0
} eJy@N
Q g"{F},4
publicvoid setItems(List items){ L<Lu;KnY6
this.items = items; H56e#:[$
} )n0g6
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publicint getPageSize(){ q2/Vt0aYx
return pageSize; 1/#N{rZ
} {[Yv@CpN
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publicvoid setPageSize(int pageSize){ n+!.0d}6
this.pageSize = pageSize; CZ&TUE|:DA
} b]Z@zS<8
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publicint getTotalCount(){ _k
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return totalCount; VVe>}
} DF&C7+hO
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publicvoid setTotalCount(int totalCount){ X2Lhb{ZHE
if(totalCount > 0){ p>!r[v'
this.totalCount = totalCount; aa".d[*1
int count = totalCount / XhIgzaGVu
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pageSize; j+c)%
if(totalCount % pageSize > 0) a7d782~
count++; FlkAo]
indexes = newint[count]; dmF<J>[
for(int i = 0; i < count; i++){ 0{B5C[PTG
indexes = pageSize * B2,!
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atN`w=6A`
i; #Xn#e
} ,g6.d#c
}else{ 9#3+k/A
this.totalCount = 0; D(r|sw
} u_Q3v9
} J#X 7Ss
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publicint[] getIndexes(){ hyTi':
return indexes; |H@M-
} <4!w2vxG
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publicvoid setIndexes(int[] indexes){ 0dgR;Dl(
this.indexes = indexes; D!X{9q}S1
} .z{7
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publicint getStartIndex(){ *v8 ]99N
return startIndex; Mv9s
} ;bA9(:?
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publicvoid setStartIndex(int startIndex){ {$s:N&5
if(totalCount <= 0) 2>H\arEstR
this.startIndex = 0; P,v}Au( UI
elseif(startIndex >= totalCount) Np=*B_ @8
this.startIndex = indexes *PMql $
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[indexes.length - 1]; 9Qkww&VEk
elseif(startIndex < 0) iF
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this.startIndex = 0; AOfQqGf
else{ dyx4_!fO
this.startIndex = indexes w6cPd'
^L'K?o
[startIndex / pageSize]; MP3E]T~:
} j&&^PH9ZY
} 7"QcvV@p
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publicint getNextIndex(){ #h&?wE>
int nextIndex = getStartIndex() + vAVoFL
&R8zuD`#
pageSize; *%fOE;-?
if(nextIndex >= totalCount) <<`."RY#0
return getStartIndex(); M.128J+xfS
else mj,r@@k:=+
return nextIndex; /qp`xJ
} 6#K_Rg>.
bk7miRIB
publicint getPreviousIndex(){ x7*}4>|W,I
int previousIndex = getStartIndex() - +}1]8:>cq
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pageSize; <bid 6Q0|
if(previousIndex < 0) U{R*WB b
return0; j[z\p~^
else OC[a?#R1
return previousIndex; Zkz:h7GUG-
}
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} T0SD|'
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抽象业务类 }8FP5Z'Cf%
java代码: 4dy)g)wM
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/** Z>{8FzP.F
* Created on 2005-7-12 [&39Yv.k,7
*/ Fq{nc]L6
package com.javaeye.common.business; CHLMY}O0
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import java.io.Serializable; =DqGm]tA
import java.util.List; P"% /
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import org.hibernate.Criteria; %bv<OMD
import org.hibernate.HibernateException; <n#JOjHV
import org.hibernate.Session; kTnvD|3_!P
import org.hibernate.criterion.DetachedCriteria; z1"UF4x*
import org.hibernate.criterion.Projections; .*,Zh2eXU
import ~#-`Qh
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org.springframework.orm.hibernate3.HibernateCallback; *JDc1$H0
import ``O\'{o&
}%:?s6Ler
org.springframework.orm.hibernate3.support.HibernateDaoS -7yX>Hjl
qNvKlwR9;k
upport; (*2"dd
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import com.javaeye.common.util.PaginationSupport; A7sej
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public abstract class AbstractManager extends LyQO_mT2
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HibernateDaoSupport { w}E?FEe.
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privateboolean cacheQueries = false; 8G@FX $$Q
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privateString queryCacheRegion; {UhZ\qe
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publicvoid setCacheQueries(boolean A+dY~@*a
}^ iE|YKz
cacheQueries){ `q/y|/v<
this.cacheQueries = cacheQueries; }\irr9,
} .K0BK)axO
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publicvoid setQueryCacheRegion(String Vs"M Cqi
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queryCacheRegion){ w(@`g/b
this.queryCacheRegion = w gufk{:
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queryCacheRegion; WH/a#F
} WRnUF[y+)
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publicvoid save(finalObject entity){ fY `A
getHibernateTemplate().save(entity); {wm
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} [C&c;YNp
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publicvoid persist(finalObject entity){ 1HZexV
getHibernateTemplate().save(entity); ^.4<#Qs
} \K4m~e@!
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publicvoid update(finalObject entity){ E^qKkl
getHibernateTemplate().update(entity); *7Mrng
} *zx;81X=
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publicvoid delete(finalObject entity){ 9DT}sCLz:B
getHibernateTemplate().delete(entity); N0XGW_f
} ffWvrY;j[
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publicObject load(finalClass entity, \gzNMI*
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finalSerializable id){ Z<wg`
return getHibernateTemplate().load ]l\J"*"aB
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(entity, id); _7;#0B
} "'8$hV65.p
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publicObject get(finalClass entity, Z2ZS5a
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finalSerializable id){ c1Hv^*Y
return getHibernateTemplate().get ^yfT7050
nqV7Db~
(entity, id); 7+z%O3k'I
} .z9JoQ
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publicList findAll(finalClass entity){ ?2i``-|Wa
return getHibernateTemplate().find("from } o=g)
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" + entity.getName()); dtnAMa5$T
} Y`_6Ny="
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publicList findByNamedQuery(finalString D,R/abYZH
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namedQuery){ .qHgQ_%
return getHibernateTemplate _[.`QW~
b,!h[
().findByNamedQuery(namedQuery); Bp b_y;E
} vb$k/8JK
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publicList findByNamedQuery(finalString query, oEfKL`]B
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finalObject parameter){ 1_F2{n:yp
return getHibernateTemplate fghJj@ES
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().findByNamedQuery(query, parameter); $cYh X^YG.
} T]0qd^\4w
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publicList findByNamedQuery(finalString query, tQ*5[F,fm
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finalObject[] parameters){ [t>}M6?R:
return getHibernateTemplate 3Hr ZN+D
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().findByNamedQuery(query, parameters); >8QLo8)3C
} %kyvtt
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publicList find(finalString query){ g"F vD_
return getHibernateTemplate().find dMYDB
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(query); \|Us/_h
} RtN5\
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publicList find(finalString query, finalObject "*<9)vQ6|
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parameter){ L%Me
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return getHibernateTemplate().find \&"gCv#
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(query, parameter); N<9CV!_
} +H8]5~',L%
+%oXPG?
public PaginationSupport findPageByCriteria '4ftclzL
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(final DetachedCriteria detachedCriteria){ 8-+Ce;h
return findPageByCriteria 7gNJ}pLDx
%;~Vc{Xxt/
(detachedCriteria, PaginationSupport.PAGESIZE, 0); H)ud?vB6
} "sdzm%
Il `35~a
public PaginationSupport findPageByCriteria 7'LKyy
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(final DetachedCriteria detachedCriteria, finalint scT,yNV
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startIndex){
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return findPageByCriteria {Cd Q)|
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(detachedCriteria, PaginationSupport.PAGESIZE, dG2k4 O
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startIndex); zmB6Y
t
} TF R8
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public PaginationSupport findPageByCriteria L7VD ZCV
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(final DetachedCriteria detachedCriteria, finalint ]{^'{ z$i
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pageSize, hg4 d]R,
finalint startIndex){ uGt}H n
return(PaginationSupport) <hkSbJF
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getHibernateTemplate().execute(new HibernateCallback(){ kD;1+lNz
publicObject doInHibernate Cw$0XyO
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(Session session)throws HibernateException { QiKci%=SX
Criteria criteria = 3u[m? Vw
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detachedCriteria.getExecutableCriteria(session); C-h9_<AwJQ
int totalCount = X(Z~oGyg
fab.%$
((Integer) criteria.setProjection(Projections.rowCount R.x^
0{Uc/
()).uniqueResult()).intValue(); WoV"&9y
criteria.setProjection *Ri\7CqU"6
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(null); H2kib4^i
List items = _ck)yY?7
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criteria.setFirstResult(startIndex).setMaxResults X8 $Y2?<
[x%[N)U3
(pageSize).list(); \1Xr4H
u
PaginationSupport ps = zEVQ[y6BcM
o%yfR.M6$
new PaginationSupport(items, totalCount, pageSize, Zh
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startIndex); 9\'JtZO
return ps; q@Aw]Kh
} _jb'HP
}, true); "hmLe(jo}
} 8TBv~Qu
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public List findAllByCriteria(final m]+~F_/
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DetachedCriteria detachedCriteria){ aPdEEqc\l
return(List) getHibernateTemplate DFkDlx
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().execute(new HibernateCallback(){ 2$OV`qy@?
publicObject doInHibernate R-Ys<;
b/{$#[oP`
(Session session)throws HibernateException { "XQ3mi`y
Criteria criteria = !,+<?o y
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detachedCriteria.getExecutableCriteria(session); Kf-XL),3l
return criteria.list(); enx+,[
} q`'m:{8
}, true); -5oYGLS$y3
} `_k_}9Fr
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public int getCountByCriteria(final #<~oR5ddlb
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DetachedCriteria detachedCriteria){ -9~$Ll+2h
Integer count = (Integer) ?)ct@,Ek$
<5E)6c_W)
getHibernateTemplate().execute(new HibernateCallback(){ e*}*3kw)T
publicObject doInHibernate 1Ys)b[:
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(Session session)throws HibernateException { {qGXv@
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Criteria criteria = a@Vk(3Rx_
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detachedCriteria.getExecutableCriteria(session); .sc80i4
return Oq$-*N
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criteria.setProjection(Projections.rowCount QLU <%w:B
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()).uniqueResult(); )Z/$;7]#
} /0cm7[a ?
}, true); p TaC$Ne
return count.intValue(); 7Vk9{x$z
} yN)(MmX'1
} #D#kw*c
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用户在web层构造查询条件detachedCriteria,和可选的 C:t?HLY)fG
s FJ:09L|
startIndex,调用业务bean的相应findByCriteria方法,返回一个 (,ik:j
-+u}u=z%
PaginationSupport的实例ps。 BW6Ox=sr<
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ps.getItems()得到已分页好的结果集 q6*i/"mN*
ps.getIndexes()得到分页索引的数组 %sPze]
ps.getTotalCount()得到总结果数 kGs\"zZM
ps.getStartIndex()当前分页索引 5~Ek_B
ps.getNextIndex()下一页索引 z R'EQ
ps.getPreviousIndex()上一页索引 b%*`}B
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w N`Njm9!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 )A%* l9\nG
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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 pZK 1G
X `EVjK
一下代码重构了。 nSh~mP
yH]Q;X'
我把原本我的做法也提供出来供大家讨论吧: XkkzY5rxOc
SPRTJdaC9
首先,为了实现分页查询,我封装了一个Page类: p-_9I7?
java代码: x7<NaMK\
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/*Created on 2005-4-14*/ J=78p#XUg
package org.flyware.util.page; M;b3-
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/** EI*~VFx
* @author Joa kaQNcMcq
* R4VX*qkB
*/ 5,oLl {S'
publicclass Page { ^X+qut+~
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/** imply if the page has previous page */ ~XP|dn}
privateboolean hasPrePage; @VW1^{.do^
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/** imply if the page has next page */ uq-`1m}
privateboolean hasNextPage; `JDZR:bMaT
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/** the number of every page */ 4H,c;g=!
privateint everyPage; DiOd!8Y
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/** the total page number */ D&"lu*"tg
privateint totalPage; LTzdg >\oJ
](Wa:U}Xs
/** the number of current page */ =O"]e/CfO
privateint currentPage; @iV-pJ-
'dh{q`#0
/** the begin index of the records by the current C7vBa<a
<`=Kt[_BQ
query */ KMkD6g
privateint beginIndex; x=xo9wEg
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/** The default constructor */ GVlT+Rs7
public Page(){ 3{~(_
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} S .x>w/
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/** construct the page by everyPage '{.4~:
* @param everyPage :vEfJSA
1<
* */ 9'sZi}rT
public Page(int everyPage){ v@GhwL
this.everyPage = everyPage; v9r.w-
} e~(e&4pb
[o(!/38"@=
/** The whole constructor */ G;vj3#u?
public Page(boolean hasPrePage, boolean hasNextPage, ?qSwV.l]d
Dzu//_u
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int everyPage, int totalPage, A g+B*
int currentPage, int beginIndex){ ^{=UKf{
this.hasPrePage = hasPrePage; 9Xa.%vw>
this.hasNextPage = hasNextPage; '/\*l<
this.everyPage = everyPage; YuVlD/
this.totalPage = totalPage; .xT{Rz
this.currentPage = currentPage; t>N2K-8Qh
this.beginIndex = beginIndex; BxV>s+o&]
} `^^t#sT
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/** iZ}c[hC'3`
* @return #T>?g5I
* Returns the beginIndex. yevJA?C4 v
*/ T*#M'H7LSQ
publicint getBeginIndex(){ D4hT Hh
return beginIndex; UNiK6h_%
} `w>D6K+
P* &0HbJ
/** ,\&r\!=
* @param beginIndex vuY X0&
* The beginIndex to set. ?<N} Xh
*/ 3`{
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publicvoid setBeginIndex(int beginIndex){ FF^h(Ea
this.beginIndex = beginIndex; Hq<4G:#
} Vfk"}k/do
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/** Y7qQ`|
* @return [$d]U.
* Returns the currentPage. LQ%QFfC
*/ `\"<%CCe
publicint getCurrentPage(){ PbS1`8|4
return currentPage; DxN\ H"
} gk?H@b*
*6AqRE
/** "0 %fR"
* @param currentPage VCnf`wZB"
* The currentPage to set. os;94yd)
*/ HfH_jnR*
publicvoid setCurrentPage(int currentPage){ "O$WfpKX
this.currentPage = currentPage; 3w p@OF_
} q)C
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/** tzgaHN
* @return Y$Rte.?
* Returns the everyPage. >f^kp8`3{Y
*/ *w^!\
publicint getEveryPage(){ reYIF*
return everyPage; V(LfFO{^>?
} u^]Gc p
4)}>dxv
/** jg%mWiKwK7
* @param everyPage @44*<!da
* The everyPage to set. 3 @O/#CP+
*/ z.)*/HGJm
publicvoid setEveryPage(int everyPage){ &Y9%Y/Y
this.everyPage = everyPage; `\ IaeMvo
} _^RN$4.R>
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/** ,SdxIhL
* @return iDgc$'%?
* Returns the hasNextPage. y!S:d
*/ 6kR3[]:16v
publicboolean getHasNextPage(){ #^|2PFh5
return hasNextPage; =1!.g"0
} mxJe\[I
'?NMQ
/** }9z$72;Qdq
* @param hasNextPage Q=[ IO,f
* The hasNextPage to set. b rDyjh
*/ 0/z$W.!
publicvoid setHasNextPage(boolean hasNextPage){ #\xy,C'Y
this.hasNextPage = hasNextPage; ,|zwY~lt5
} 4 s9^%K\8{
Lew
2Z
/** !VudZ]Sg
* @return QGErQ
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* Returns the hasPrePage. fcohYo5mh
*/ pD~."fb
publicboolean getHasPrePage(){ CL(D&8v8~
return hasPrePage; ao(Lv+
} _]3#C[1L
]D2d=\
/** qI74a F
* @param hasPrePage fL'Ci;.;+
* The hasPrePage to set. Ib/e\+H\
*/ EQHCw<e
publicvoid setHasPrePage(boolean hasPrePage){ &f)pU>Di
this.hasPrePage = hasPrePage; L0%W;m
} {[{jlG4H
6HVX4Z#VH
/** E(*CEW.V*
* @return Returns the totalPage. +j8-l-o
* 0NvicZ7VR
*/ ]yFO~4Nu
publicint getTotalPage(){ o> 1+m
return totalPage; dg(sRTi{
} bNvc@oo
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/** wo86C[
* @param totalPage ~sWXd~\
* The totalPage to set. bK!uR&i^l
*/ [4PiQyr
publicvoid setTotalPage(int totalPage){ #%z@yg
this.totalPage = totalPage; {k'$uW`
} 3JF" O+@
mMK 93Ng"&
} ]qk`Yi
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a3 t||@v!
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 `n`HwDo;i
v/Xz.?a\jF
个PageUtil,负责对Page对象进行构造: {^R"V ,)
java代码: Z =*h9,MY
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/*Created on 2005-4-14*/ +OOmy
package org.flyware.util.page; jhka;m
lBG"COu
import org.apache.commons.logging.Log; xl(R|D))
import org.apache.commons.logging.LogFactory; bW^{I,b<F
iis}=i7|
/** (^)(#CxO
* @author Joa ^`9O$.'@
* <x:^w'V_b
*/ 6lQP+! EF
publicclass PageUtil { 6eK7Jv\K
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privatestaticfinal Log logger = LogFactory.getLog ebf/cCh
w.-J2%J
(PageUtil.class); =$<