Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $:N
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 EI.Pk>ZIm
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 +|<b0Xd
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 Hc%\9{zH
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分页支持类: J-<B*ot+lX
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java代码: kw:D~E(
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package com.javaeye.common.util; ee^_Dh4
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import java.util.List; :+Ax3
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publicclass PaginationSupport { faOWhIG
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publicfinalstaticint PAGESIZE = 30; -*fYR#VQQB
si_HN{
privateint pageSize = PAGESIZE; m =,c,*>
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privateList items; p-r%MnT
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privateint totalCount; Z*>/@ J}
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privateint[] indexes = newint[0]; o>-v?Ug
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privateint startIndex = 0; cgXF|'yI&l
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public PaginationSupport(List items, int e@-Mlq)
{/xs9.8:JX
totalCount){ ;6txTcn`=
setPageSize(PAGESIZE); ^[[b$h$
setTotalCount(totalCount); %N>NOk)
setItems(items); {
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setStartIndex(0); ~o'#AP#N~
} arQ%
#*$@_
public PaginationSupport(List items, int tZCe?n]
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totalCount, int startIndex){ j~*Z7iu
setPageSize(PAGESIZE); z12But\<
setTotalCount(totalCount); wy-
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setItems(items); qZsddll
setStartIndex(startIndex); ~)a;59<$
} 0s9z @>2
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public PaginationSupport(List items, int <N=p:e,aN,
`s>=Sn&UP
totalCount, int pageSize, int startIndex){ @IY?DO
setPageSize(pageSize); xhkWKB/7
setTotalCount(totalCount); %"[dGB$S
setItems(items); #"8[8jyV
setStartIndex(startIndex); SKpPR;=q|:
} k-pEBhOH
kTZx-7~
publicList getItems(){ U%t/wq
return items; 8{<[fZyC
} [&qbc#L
%;\G@q_p{
publicvoid setItems(List items){ :6j :9lYL2
this.items = items; *Z]WaDw
} /4
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publicint getPageSize(){ iqednk%
return pageSize; [x<6v}fRn
} OW^2S_H5
iE^a%|?}
publicvoid setPageSize(int pageSize){ V}|v!h[O8
this.pageSize = pageSize; ?
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} "8muMa8Q%
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publicint getTotalCount(){ #>:(#^Uu
return totalCount; yLz,V}
} )Bn>/-
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publicvoid setTotalCount(int totalCount){ ^~6] 0$yJ
if(totalCount > 0){ pP0Vg'V
this.totalCount = totalCount; !b]2q%XM
int count = totalCount / M=AvD(+ha
U7"BlT!V\
pageSize; OOBcJC
if(totalCount % pageSize > 0) .K@x4
/1
count++; q#(/*AoU
indexes = newint[count]; HD:%Yv
for(int i = 0; i < count; i++){ |N$?_<H
indexes = pageSize * <P^hYj-swh
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i; %]<RRH.w
} a}Fk x
}else{ SCurO9RN
this.totalCount = 0; PNJe&q0*
} f>8B'%]
} !rXcGj(k
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publicint[] getIndexes(){ kWs+2j
return indexes; ^V: "zzn&
} >I d!I
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publicvoid setIndexes(int[] indexes){ +qdIj] v
this.indexes = indexes; t[?a@S~6
} dm2CA0
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publicint getStartIndex(){ ~y)bYG!G
return startIndex; {M@@)27gW
} kPO6gdwq$
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publicvoid setStartIndex(int startIndex){ w*:GM8=6
if(totalCount <= 0) 8jjFC9Cbn0
this.startIndex = 0; *"5N>F[L
elseif(startIndex >= totalCount) $,KP]~?
this.startIndex = indexes mLg{6qm(q
f]ue#O
[indexes.length - 1]; 2Io6s'
elseif(startIndex < 0) v\%B
this.startIndex = 0; rv}mD
else{ 6QII&Fg
this.startIndex = indexes U=kx`j>
x7.QL?qR.
[startIndex / pageSize]; 5pM&h~M
} `V&1]C8x
} `*NO_K
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publicint getNextIndex(){ ~!ZmF(:
int nextIndex = getStartIndex() + T A\4uy6o
ou'~{-_xd
pageSize; VT%
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if(nextIndex >= totalCount) #v4LoNm
return getStartIndex(); CGC-"A/W
else pcy<2UV
return nextIndex; X>Al:?`}N
} SOp=~z
}!%JYG^!D
publicint getPreviousIndex(){ ~H^'al2PK
int previousIndex = getStartIndex() - > -y&$1
:reP} Da7q
pageSize; 3`A>j"
if(previousIndex < 0) |(V?,^b^ro
return0; &~~aAg
else `KpFH.k.K
return previousIndex; c~}={4M]
} oZvA~]x9\
V@D]bV@4
} Vd+td;9(
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抽象业务类 ;} l T
java代码: KVB0IXZC~
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/** <S1??
* Created on 2005-7-12 -<qxO
*/ :dP~.ZY7
package com.javaeye.common.business; SY-ez91
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import java.io.Serializable; $Y6I_U
import java.util.List; {L@+(I
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import org.hibernate.Criteria; .,3Zj /
import org.hibernate.HibernateException; ^rv"o:lF
import org.hibernate.Session; z %x7fe
import org.hibernate.criterion.DetachedCriteria; )K~w'TUr
import org.hibernate.criterion.Projections; .'|mY$U~]
import |3}5:k
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org.springframework.orm.hibernate3.HibernateCallback; &E
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import 6M ^IwE
Ji;SY{~kv
org.springframework.orm.hibernate3.support.HibernateDaoS ' .B.V?7
n*Q`g@`
upport; vUNisVA
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import com.javaeye.common.util.PaginationSupport; } h[>U
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public abstract class AbstractManager extends s%~L4Wmcq
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HibernateDaoSupport { y
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privateboolean cacheQueries = false; 3VmI0gsm.>
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privateString queryCacheRegion; |6E
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publicvoid setCacheQueries(boolean Q1Ux!$_
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cacheQueries){ 'b^l'KN:S
this.cacheQueries = cacheQueries; ~e P
} Nl@k*^
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publicvoid setQueryCacheRegion(String W9Nmx3ve
JqEW=5
queryCacheRegion){ u~W{RHClW
this.queryCacheRegion = OifvUTl9b
mN;+TN'?{
queryCacheRegion; iq?l#}]
} eNRs&^
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publicvoid save(finalObject entity){ $X*mdji
getHibernateTemplate().save(entity); #~^btL'dHF
} Ln.9|9
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publicvoid persist(finalObject entity){ $I@GUtzjp
getHibernateTemplate().save(entity); ,CciTXf
} J$F nm\
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publicvoid update(finalObject entity){ P;vxT}1
getHibernateTemplate().update(entity); e+'%!w"B
} Z%}4bJ
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publicvoid delete(finalObject entity){ G@gh#[b
getHibernateTemplate().delete(entity); jd 1jG2=f
} %j7:tf=
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publicObject load(finalClass entity, 0GZq`a7[
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finalSerializable id){ M;+IZr Wkl
return getHibernateTemplate().load fkjeR
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(entity, id); xRum*}|4
} i|]7(z#OyI
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publicObject get(finalClass entity, }aF
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finalSerializable id){ w{!(r
return getHibernateTemplate().get ExVDkt0
tx"LeZZ
(entity, id); x)SralWb
} m:uPEpcU
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publicList findAll(finalClass entity){ [:h5}
return getHibernateTemplate().find("from =su]w2,Iy
<8!
Tq
" + entity.getName()); hmpr%(c `
} wpXgPVZT
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publicList findByNamedQuery(finalString 1!1!PA9u
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namedQuery){ Ipe n
return getHibernateTemplate DkDoA;m
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().findByNamedQuery(namedQuery); _ \D"E>oM
} Y-)xTn
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publicList findByNamedQuery(finalString query, +bA%
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finalObject parameter){ 3Bd X
return getHibernateTemplate 8w_7O>9
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().findByNamedQuery(query, parameter); uo2'"@[e
} ! zL1;d
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publicList findByNamedQuery(finalString query, tGjhHp8}c
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finalObject[] parameters){ x|i_P|Z
return getHibernateTemplate k7@t{Cu0D&
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().findByNamedQuery(query, parameters); 8`=v.
} s@8w-]"
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publicList find(finalString query){ w_hHfZ9E
return getHibernateTemplate().find 3Fs5RC~a
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(query); /3!fA=+
} tyh@^7
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publicList find(finalString query, finalObject H,QTYXi "
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parameter){ j$Ab>}g]
return getHibernateTemplate().find E{E0Z9t7&
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(query, parameter); S<`I
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} e}hmS 1>H
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public PaginationSupport findPageByCriteria mh.+."<)F
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(final DetachedCriteria detachedCriteria){ %}-?bHB1c
return findPageByCriteria >R\lqLILb,
l+*&:Q/
(detachedCriteria, PaginationSupport.PAGESIZE, 0); cxIk<&i~(
} rx0~`cVV:
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public PaginationSupport findPageByCriteria i,IB!x
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(final DetachedCriteria detachedCriteria, finalint z^<L(/rg9"
UC
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startIndex){ 3]RyTQ
return findPageByCriteria +Q$h ]^>~
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(detachedCriteria, PaginationSupport.PAGESIZE, TX=yPq
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startIndex); n_?tN\M
} 3"N)xO-
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public PaginationSupport findPageByCriteria Fqy\CMC
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(final DetachedCriteria detachedCriteria, finalint U;N:j8
8[vc?+>&
pageSize, @$9'@")
finalint startIndex){ F$BbYf2i
return(PaginationSupport) V#REjsf,t-
#@HF<'H}mu
getHibernateTemplate().execute(new HibernateCallback(){ $+p?Y)h .
publicObject doInHibernate LbEM^D
UT0){%2@
(Session session)throws HibernateException { 8N&+7FK
Criteria criteria = _g%TSumvq<
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detachedCriteria.getExecutableCriteria(session); )R`x R,H
int totalCount = [AMAa]^
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((Integer) criteria.setProjection(Projections.rowCount vM:cWat
a=cvCf
()).uniqueResult()).intValue(); Ar*^;/
criteria.setProjection |L2SFB?d=
?;[w" `"
(null); ktIi$v
List items = v~QHMg
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criteria.setFirstResult(startIndex).setMaxResults X+UJzR90
*na?n2Yzt
(pageSize).list(); A,sr[Pa@
PaginationSupport ps = V |(H|9
8J$|NYv_b
new PaginationSupport(items, totalCount, pageSize, 9mA{K
[8tL"G6s
startIndex); ^[:p|U2mA
return ps; Po%LE]v,
} [sB 9gY(
}, true); F*"}aP$
} &f-Uyr7?
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public List findAllByCriteria(final F~h7{@\
.o) `m9/
DetachedCriteria detachedCriteria){ C74a(Bk}H
return(List) getHibernateTemplate o2<#s)GpY
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().execute(new HibernateCallback(){ 0lhVqy}:}o
publicObject doInHibernate th;{V%:LW
*98$dQR$
(Session session)throws HibernateException { 6I@h9uIsze
Criteria criteria = n{6G"t:^l
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detachedCriteria.getExecutableCriteria(session); BD(Z5+EU1
return criteria.list(); L4!{h|
} B95B|tU>.
}, true); /!c${W!sY
} j4qJ.i
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public int getCountByCriteria(final w.[ "p9tc
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DetachedCriteria detachedCriteria){ +HBd
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Integer count = (Integer) 6i1LjLB
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getHibernateTemplate().execute(new HibernateCallback(){ P9T}S
publicObject doInHibernate y3fGWa*7e
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(Session session)throws HibernateException {
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Criteria criteria = x QIq^/F0
@)fd}tV
detachedCriteria.getExecutableCriteria(session); ouuuc9x]
return J:Qa5MTWp
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criteria.setProjection(Projections.rowCount 8P|D13- Q
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()).uniqueResult(); e
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} =>_\fNy
}, true); Q\ 0cvmU
return count.intValue(); #3gp6*R
} 1,% R;7J=g
} [Al&
iKT [=c
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用户在web层构造查询条件detachedCriteria,和可选的 JU)dr4S?
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 YB2VcF.LU
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PaginationSupport的实例ps。 'h,VR=e<
NA ~Vg8
ps.getItems()得到已分页好的结果集 tP$<UKtU
ps.getIndexes()得到分页索引的数组 eS~LF.^Jw
ps.getTotalCount()得到总结果数 2Eu`u!jhx
ps.getStartIndex()当前分页索引 =,6z4" )
ps.getNextIndex()下一页索引 7t0er'VC
ps.getPreviousIndex()上一页索引 :g Wu9Y|{
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 \D*KGd]M0
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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 ^LoUi1j
6\q]rfQ
一下代码重构了。 rE.;g^4p
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我把原本我的做法也提供出来供大家讨论吧: D$I5z.a
,)Znb=
首先,为了实现分页查询,我封装了一个Page类: 4\8+9b\9"
java代码: 1cpiHZa
!ug8SAOaz/
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/*Created on 2005-4-14*/ GLeK'0Q@
package org.flyware.util.page; f Sa"%8%
*V8<:OG|e
/** 7o#I,d~
* @author Joa E/|To
* l3ko?k
*/ -z)n?(pftm
publicclass Page { Z8K?
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/** imply if the page has previous page */ svcK?^
HTe
privateboolean hasPrePage; 5YeM%%-S
Bg x'9p/
/** imply if the page has next page */ \Je0CD=e`
privateboolean hasNextPage; 3q\,$*D.
+M\`#i\g>
/** the number of every page */ 3TeY%5iVt
privateint everyPage; (X\@t-8
JfLqtXF[&"
/** the total page number */ l5!|I:/*;
privateint totalPage; @tNz Q8
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/** the number of current page */ FKDk +ojw
privateint currentPage; PNgY>=Y
lrlgz[
/** the begin index of the records by the current W$hx,VEy`
&=] ~0$
query */ N8F~8lTi
privateint beginIndex; %)zodf
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/** The default constructor */ f
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public Page(){ G\2CR*
4'/nax$Bx;
} vWzm@
` Mjj@[
/** construct the page by everyPage *\+\5pu0
* @param everyPage PUp6Q;AdQ
* */ H<i]V9r
public Page(int everyPage){ 5F)C jQ
this.everyPage = everyPage; n'n/Tu
} ;K:zmH
bzBEX mC
/** The whole constructor */ pjKWtY@=X
public Page(boolean hasPrePage, boolean hasNextPage, *2pt%eav
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!/'t5~x[
int everyPage, int totalPage, <J<{l
int currentPage, int beginIndex){ _S<3\%(0
this.hasPrePage = hasPrePage; *+Ek0M
this.hasNextPage = hasNextPage; z+0I#kM"1
this.everyPage = everyPage; 3]}D`Qs6
this.totalPage = totalPage; %?0:vn
this.currentPage = currentPage; EN<F# Y3E
this.beginIndex = beginIndex; FH?U(-
} 4VJ-,Z
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/** kbX8$xTM
* @return CGW.I$u
* Returns the beginIndex. oK6tTK
*/ [+2[`K
c]
publicint getBeginIndex(){ SoW9p^HJ
return beginIndex; rK' L6o
} W9 GxXPA
!Q2d(H>
/** XRM_x:+]
* @param beginIndex $v4.sl:x
* The beginIndex to set. F~R;n_IJ
*/ hgYZOwQ
publicvoid setBeginIndex(int beginIndex){ 0fb2;&pUa
this.beginIndex = beginIndex; sEp"D+f
} QO<jI#
`06;
/** jl4rbzse
* @return K
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* Returns the currentPage. ~ (|5/
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*/ 7OcWC-<
publicint getCurrentPage(){ `x+ B+)0X
return currentPage; *'Sd/%8{
} n`? py
!,wIQy_e4
/** [\^n=
* @param currentPage h]IxXP?h[
* The currentPage to set. 1OGx>J6
*/ |s7s6k)mm
publicvoid setCurrentPage(int currentPage){ 1-8mFIK
this.currentPage = currentPage; dP9qSwTa
} b6c Bg
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/** I&D5;8
* @return ,?J!
* Returns the everyPage. |^&b8
*/ ?&8^&brwG
publicint getEveryPage(){ dN$0OS`s[
return everyPage; e>} s;H,
} .[]r}[ lU
X&tF;<m^
/** Ep9nsX*
* @param everyPage ;km`P|<U
* The everyPage to set. zJq~!#pZ
*/ H4WP~(__
publicvoid setEveryPage(int everyPage){ Q:2>}QgX}
this.everyPage = everyPage; / C:Y94B-z
} u
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/** ? ^0:3$La
* @return Z)I+@2
* Returns the hasNextPage. 29;?I3<
*
*/ G?L HmTHg
publicboolean getHasNextPage(){ q$0*b]=E
return hasNextPage; ]AINKUI0
} O*hDbM2QQw
S]}nm
/** %|s; C
* @param hasNextPage }n]Ng]KM`
* The hasNextPage to set. ;,hwZZA
*/ )X1{
publicvoid setHasNextPage(boolean hasNextPage){ !EvAB+`jLI
this.hasNextPage = hasNextPage; !y\'EW3|G
} XQY#716)
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/** \o z#l'z
* @return -R|,9o^
* Returns the hasPrePage. 6hno)kd{=
*/ H`*LBqDk
publicboolean getHasPrePage(){ EEEh~6?-e
return hasPrePage; }5ret
} +5w))9@
2~Kgv|09
/** R[zpD%CI
* @param hasPrePage $.Qkb@}
* The hasPrePage to set. {j{u6i
*/ 8o3E0k1
publicvoid setHasPrePage(boolean hasPrePage){ xsIY7Ss U
this.hasPrePage = hasPrePage; .T}Wdng
} QVv#fy1"6
P}Gj%4/G
/** M,j U}yD3
* @return Returns the totalPage. aZH:#lUlj
*
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*/ tZ]?^_Y1
publicint getTotalPage(){ /
kF)
return totalPage; 8V~k5#&Ow
} P@,XEQRd`
4-l8,@9
/** .iYJr;9`d
* @param totalPage @KXV%a'
* The totalPage to set. :N:yLd} &
*/ _('=b/
publicvoid setTotalPage(int totalPage){ %vn|k[nD
this.totalPage = totalPage; ^P[e1?SZG
} g?c
xp+
~Q Oe##
} ?k+xSV
[u
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DHyq^pJ
ZJnYIK
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 cutu DZ
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个PageUtil,负责对Page对象进行构造: +! ]zA4x
java代码: DEBB()6,
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/*Created on 2005-4-14*/ f&=AA@jLv
package org.flyware.util.page; XPavReGf
h&M{]E9=
import org.apache.commons.logging.Log; h}>"j%I
import org.apache.commons.logging.LogFactory; .r|tSfm6
&p