Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 UlHRA[SCv
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 j w)Lofn
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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 E/<[G?
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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 ?=]`X=g6
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分页支持类: r3l}I6
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java代码: jGzs; bE
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package com.javaeye.common.util; ,epKt(vl
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import java.util.List; 22\Buk}?
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publicclass PaginationSupport { C+Wb_
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publicfinalstaticint PAGESIZE = 30; GdavCwJ
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privateint pageSize = PAGESIZE; .*>LD
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privateList items; X6~y+R
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privateint totalCount; Jp.Sow
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privateint[] indexes = newint[0]; Wxg,y{(`
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privateint startIndex = 0; xDu11W+g
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public PaginationSupport(List items, int =y8HOT}8
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totalCount){ pvTV*
setPageSize(PAGESIZE); $=$I^hV
setTotalCount(totalCount); Tk9*@kqv
setItems(items); Phl't~k
setStartIndex(0); k0?4vA
} _Kx
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public PaginationSupport(List items, int iYA06~d
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totalCount, int startIndex){ 1 ,o C:N
setPageSize(PAGESIZE); a
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setTotalCount(totalCount); n<Z;Xh~F
setItems(items); :Tw3Oo_~S
setStartIndex(startIndex); gh}FZs5P
} N{`-&8q;K
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public PaginationSupport(List items, int !h7`W*::
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totalCount, int pageSize, int startIndex){ RMDs~
setPageSize(pageSize); m?xzx^xs/
setTotalCount(totalCount); !,Wd$UK
setItems(items); 7|T<dfQk
setStartIndex(startIndex); %96JH
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} {$>*~.Wu
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publicList getItems(){ Kwfrh?
return items; 4QK([q
} JiP]FJ;
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publicvoid setItems(List items){ *%'4.He7V
this.items = items; #O^H?3Q3
} [X)+(-J
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publicint getPageSize(){ GC H= X
return pageSize; Mq42^m:qe
} d6<,R;)
Gp$[u4-6M6
publicvoid setPageSize(int pageSize){ nTY`1w.;
this.pageSize = pageSize; @.T'
} J$&!Y[0
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publicint getTotalCount(){ }f^r@3Cb3
return totalCount; eGvHU ;@
} 9#/z[!
<!K2xb-d^
publicvoid setTotalCount(int totalCount){ Y:G6Nd
VFM
if(totalCount > 0){ B8Jev\_
this.totalCount = totalCount; ' rHkJ
int count = totalCount / P$.Azrl
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pageSize; X.,SXNS+B
if(totalCount % pageSize > 0) 5bv(J
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count++; ;7 i0ko9
indexes = newint[count]; >
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for(int i = 0; i < count; i++){ v@`#!iu
indexes = pageSize * 6,uW{l8L
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i; }@4m@_gR?
} }0?642 =-
}else{ +KDB^{
this.totalCount = 0; I5Foh|)
} h(] O;a-
} nWbe=z&y8[
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publicint[] getIndexes(){ u
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return indexes; ~({aj|Y
} &B#HgWud
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publicvoid setIndexes(int[] indexes){ w@X<</`
this.indexes = indexes; ]XJpy-U
} jr*A1y*
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publicint getStartIndex(){ g{8>2OK$c
return startIndex; <N=p_m
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} C$aiOK-]+
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publicvoid setStartIndex(int startIndex){ 7&:gvhw
if(totalCount <= 0) JE9|;A
this.startIndex = 0; el.;T*Wn
elseif(startIndex >= totalCount) B~lrd#qC
this.startIndex = indexes _,NL;66=[
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[indexes.length - 1]; 9X@y*;w<t
elseif(startIndex < 0) zbx,qctYo$
this.startIndex = 0; Yj/S(4(h?
else{ #_QvnQ?I
this.startIndex = indexes KZ`d3ad
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[startIndex / pageSize]; EHcqj;@m
} -}MWA>an8
} C:_!zY'z
* ?rw'
publicint getNextIndex(){ 4bhm1Q
int nextIndex = getStartIndex() + *r?g&Vw$m
4NQS'*%D
pageSize; 5(%+8<2
if(nextIndex >= totalCount) NV9D;g$Y
return getStartIndex(); m!|u{<,R
else -mO[;lO
return nextIndex; iwJBhu0@#
} E%3WJ%A
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publicint getPreviousIndex(){ 8K]fw{-$L
int previousIndex = getStartIndex() - ><TuL7+
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pageSize; 7sC$hm]
if(previousIndex < 0) &rorBD 5aj
return0; 7X2g"2\Wm
else E3_e~yu&
return previousIndex; 6*S|$lo9B
} ^uMy|d
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} xFHc+m' m~
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抽象业务类 z62e4U][
java代码: >9Fs)R]P
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/** xQ* U9Wt;T
* Created on 2005-7-12 lHV
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*/ <o3e0JCq
package com.javaeye.common.business; i t,i^32|
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import java.io.Serializable; =~?2i)-mC
import java.util.List; ?M;2H{KG:
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import org.hibernate.Criteria; gPT-zul
import org.hibernate.HibernateException; !Jh-v
import org.hibernate.Session; G>M#
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import org.hibernate.criterion.DetachedCriteria; Vu*yEF}
import org.hibernate.criterion.Projections; &AU%3b
import bguhx3s
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org.springframework.orm.hibernate3.HibernateCallback; Nw+0b4{
import I$n 0aR6
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org.springframework.orm.hibernate3.support.HibernateDaoS 5:hajXd
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upport; 9FP6Z[4
' 6Ybf
import com.javaeye.common.util.PaginationSupport; 1wW8D>f]K
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public abstract class AbstractManager extends KX"?3#U#Fm
@r%[e1.
HibernateDaoSupport { o`+6E
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privateboolean cacheQueries = false; R."<he ;
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privateString queryCacheRegion; 9Y&n$svB
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publicvoid setCacheQueries(boolean w+=>b
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cacheQueries){ hWJ\dwF
this.cacheQueries = cacheQueries; z.
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} YKJk)%;+w
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publicvoid setQueryCacheRegion(String 7Z0
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queryCacheRegion){ |n \HxU3
this.queryCacheRegion = (8?t0}#t
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queryCacheRegion; f+}?$'
} }9/30
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publicvoid save(finalObject entity){ z\pT nteO
getHibernateTemplate().save(entity); U? [a@Hj{
} }W#Gf.$6C
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publicvoid persist(finalObject entity){ D(Pd?iQIO
getHibernateTemplate().save(entity); MG*#-<OV.
} ^+F@KXnL
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publicvoid update(finalObject entity){ 8Focs p2
getHibernateTemplate().update(entity); TbXp%O:[W
} )TP1i
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publicvoid delete(finalObject entity){ ?_%*{]mt(
getHibernateTemplate().delete(entity); R^iF^IB
} ^o,P>u!9
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publicObject load(finalClass entity, f$Nz).(
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finalSerializable id){ I5mnV<QA^
return getHibernateTemplate().load >2x[ub%$L
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(entity, id); 7"yA~e,l
} skh6L!6*<
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publicObject get(finalClass entity, w=vK{h#8
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finalSerializable id){ +;c)GNQ)6:
return getHibernateTemplate().get a}|B[b
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(entity, id); dGt;t5AnV
} e[$=5U~c
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publicList findAll(finalClass entity){ Rb
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return getHibernateTemplate().find("from mDEO$:A
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" + entity.getName()); dZFf/BXU
} qZ'&zB)
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publicList findByNamedQuery(finalString 2.{:PM4Z4
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namedQuery){ OC nQSkj
return getHibernateTemplate a x4V(
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().findByNamedQuery(namedQuery); OBqaf
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} a6wPkf7-H
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publicList findByNamedQuery(finalString query, dYrw&gn
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finalObject parameter){ [G>8N5@*
return getHibernateTemplate {'C PLJ{R
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().findByNamedQuery(query, parameter); 5tdFd"oo
} 3jZPv;9OC
es 8%JTi
publicList findByNamedQuery(finalString query, &<2~7?$!
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finalObject[] parameters){ @W[`^jfQ
return getHibernateTemplate f]W$4f{
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().findByNamedQuery(query, parameters); _CN5,mLNRk
} 15U]/?jv8
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publicList find(finalString query){ X:+lD58
return getHibernateTemplate().find Tf(-Duxz
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(query); N9QHX
} \=Rw/[lR
*`&4<>=n
publicList find(finalString query, finalObject 7TD%vhbiwi
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parameter){ i}"Eu<
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return getHibernateTemplate().find 1O3"W;SR<:
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(query, parameter); LI1OocY.]
} LlOUK2tZ
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public PaginationSupport findPageByCriteria J:LwO
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(final DetachedCriteria detachedCriteria){ 6yH(u}!.
return findPageByCriteria 04g=bJ
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); q;a"M7
} YaU)66=u
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public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria, finalint }GI8p* ]o=
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startIndex){ 5q4sxY9T
return findPageByCriteria WX<),u2@
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(detachedCriteria, PaginationSupport.PAGESIZE, tk=~b}8
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startIndex); 'b(V8x
} KYBoGCS >
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public PaginationSupport findPageByCriteria h[HFZv~{
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(final DetachedCriteria detachedCriteria, finalint q$IgkL
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pageSize, 7HfA{.|m
finalint startIndex){ P5,X,-eG
return(PaginationSupport) o&WKk5$
=, kH(rp2
getHibernateTemplate().execute(new HibernateCallback(){ Z
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publicObject doInHibernate Q|T9tc->
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(Session session)throws HibernateException { /A$mP)}tz
Criteria criteria = yvN;|R
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detachedCriteria.getExecutableCriteria(session); (b!`klQ
int totalCount = <;) qyP
NABVU0}
((Integer) criteria.setProjection(Projections.rowCount nz-( 8{ae
@ px4[
()).uniqueResult()).intValue(); wX?<o
criteria.setProjection =XAFW
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(null); W<']Q_su
List items = 6IRzm6d
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criteria.setFirstResult(startIndex).setMaxResults |Iq#Q3w
3" B$M
(pageSize).list(); ]CLt Km
PaginationSupport ps = XNZW J
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new PaginationSupport(items, totalCount, pageSize, Iq/V[v
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startIndex); f\cm84
return ps; v>ygr8+C,
} [&_c.ti
}, true); #ArMX3^+w7
} d4(!9O.\
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public List findAllByCriteria(final !u0|{6U
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DetachedCriteria detachedCriteria){ (>.+tq}
return(List) getHibernateTemplate C{gY*+
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().execute(new HibernateCallback(){ 6KpG,%2L#
publicObject doInHibernate b`%(.&
22`N(_
(Session session)throws HibernateException { .|d2s
Criteria criteria = Fqr}zR)
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detachedCriteria.getExecutableCriteria(session); 6xfG`7Az
return criteria.list(); "V7
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} s01W_P .@R
}, true); >S]_{pb
} U`25bb1Wj
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public int getCountByCriteria(final Rq,ST:
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DetachedCriteria detachedCriteria){ Wu:@+~J.h
Integer count = (Integer) 1ig#|v*+
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getHibernateTemplate().execute(new HibernateCallback(){ uW@o,S0:
publicObject doInHibernate w26x)(7
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(Session session)throws HibernateException { ~4MUac^w
Criteria criteria = E]opA$JQ
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detachedCriteria.getExecutableCriteria(session); P R{y84$
return 3jaY\(`%h
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criteria.setProjection(Projections.rowCount jjbw+
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()).uniqueResult(); Z,x9 {
}
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}, true); 3J{hG(5
return count.intValue(); ~YYg~6}vV
} %\uEV
} aucQZD-_"
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用户在web层构造查询条件detachedCriteria,和可选的 _jhdqON6E
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 q%^vx%aL\
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PaginationSupport的实例ps。 `U~Y{f_!H
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ps.getItems()得到已分页好的结果集 "q'9-lk
ps.getIndexes()得到分页索引的数组 9F*],#ng
ps.getTotalCount()得到总结果数 .JJ^w!|>#
ps.getStartIndex()当前分页索引 NbDfD3
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ps.getNextIndex()下一页索引 G0u3*.
ps.getPreviousIndex()上一页索引 s</llJ$
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 OR\-%JX/5
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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 VB?mr13}G
+]!`>
一下代码重构了。 qZ39TTQ*p
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我把原本我的做法也提供出来供大家讨论吧: kOe~0xoT@u
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首先,为了实现分页查询,我封装了一个Page类: 9hG+?
java代码: YBX7WZCR
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/*Created on 2005-4-14*/ &M,"%w!
package org.flyware.util.page; fGv`.T _d
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/** HxVQeyOR
* @author Joa })l+-H"
* yk5T"#'+
*/ }UzO_&Z#6
publicclass Page { h)M9Oup`
Kk^tQwj/QE
/** imply if the page has previous page */ jaoGm$o>"F
privateboolean hasPrePage; mndUQN_Gb
o6} +5
/** imply if the page has next page */ 0shNwV1zF
privateboolean hasNextPage; \E'Nk$V3
D4"](RXH
/** the number of every page */ h= 3156M
privateint everyPage; `R}D@
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/** the total page number */ ;'Pi(TA)
privateint totalPage; n
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kUJ\AK
/** the number of current page */ GQ-owH]
privateint currentPage; #0-!P+c[
u&=SZX&G k
/** the begin index of the records by the current |\/0S
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query */ cZRLYOC
privateint beginIndex; oE&Zf/
y\
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C { }s
/** The default constructor */ HY]vaA`
public Page(){ 5k`[a93T
F_SkS?dB
} tVhY=X{N?
OpwZTy}1}
/** construct the page by everyPage t[6 g9 e$
* @param everyPage ;+-$=l3[a
* */ ]|q\^k)JU
public Page(int everyPage){ i\S } aCm
this.everyPage = everyPage; [@}{sH(#Ta
} }lgqRg)F9[
X$O,L[] 4
/** The whole constructor */ 6,'!z
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public Page(boolean hasPrePage, boolean hasNextPage, JlsRP
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t|*PC
int everyPage, int totalPage, ?4
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int currentPage, int beginIndex){ @j$tpz
this.hasPrePage = hasPrePage; S,5>g07-`
this.hasNextPage = hasNextPage; ^uW!=%D
this.everyPage = everyPage; XM/P2=;
this.totalPage = totalPage; +a&-'`7g
this.currentPage = currentPage; h^P>pI~
this.beginIndex = beginIndex; %PG::b
} R]%ZqT{PS
h2Ifq!(:
/** oHmU|
* @return x8T5aS
* Returns the beginIndex. ]{OEU]I@
*/ k=[!{I
publicint getBeginIndex(){ -[#Mx}%
return beginIndex; vd-`?/,||
} k@5,6s:
66=6;77
/** E{r_CR+8
* @param beginIndex ,_T,B'a:
* The beginIndex to set. "b*.>QuZ
*/ _ Z6/r^c
publicvoid setBeginIndex(int beginIndex){ RR:m<9l
this.beginIndex = beginIndex; [pbX_
} T\:3(+uK
M[_~7~4
/** q*A2>0O
* @return w\;=3C`
* Returns the currentPage. ?ZSG4La\
*/ &a8#qv"l
publicint getCurrentPage(){ I
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return currentPage; `sN3iD!@R
} w2~(/RgO
o lNL|WJ`w
/** `h S<F"
j
* @param currentPage 8N(bLGUG
* The currentPage to set. bF'~&<c
*/ 76)(G/
publicvoid setCurrentPage(int currentPage){ j:|60hDz^
this.currentPage = currentPage; mf@YmKbp
} -3VxjycY
| qHWM
/** $BE^'5G&4Y
* @return 8N6a= [fv<
* Returns the everyPage. ^lu)'z%6
*/ AnPm5i.
publicint getEveryPage(){ /[[zAq{OA
return everyPage; N)RWC7th{
} _OcgD<
}QncTw0
/** fB"3R-H?O
* @param everyPage S#+G?I3w
* The everyPage to set. K4n1#]8i
*/ &tD`~
publicvoid setEveryPage(int everyPage){ ?9!tMRb
this.everyPage = everyPage; N)
{
} Ats"iV
{<~XwJ.
/** z.Y7 u3K.8
* @return HcHfwLin0
* Returns the hasNextPage. %8$JL=c
*/ 2>fG}qYy$
publicboolean getHasNextPage(){ yL.si)h(p
return hasNextPage; 'A!Dg
} uA!T@>vl
nB,FJJ{kb
/** T|ZZkNP|6
* @param hasNextPage gRdE6aIZ
* The hasNextPage to set. #jr;.;8sQ
*/ S97.O@V!$
publicvoid setHasNextPage(boolean hasNextPage){ Z6>:k,-Ot
this.hasNextPage = hasNextPage; )\^o<x2S
} :v{$]wg
#TW$J/Jb
/** 9z'</tJ`
* @return lbg6n:@
* Returns the hasPrePage. 7@EYF
*/ Yc?t aL)
publicboolean getHasPrePage(){ ,l;
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return hasPrePage; EemKYcE@Nr
} %/etoK
|,dMF2ADc
/** tt J,rM
* @param hasPrePage G:WMocyXI'
* The hasPrePage to set. ]N=C%#ki!
*/ .2xypL8(
publicvoid setHasPrePage(boolean hasPrePage){ tsfOPth$*
this.hasPrePage = hasPrePage; |,sUD/rt
} P60 3P
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/** =#Vdz=.
* @return Returns the totalPage. d*A >P
* *$#r%
*/ 9d[0i#` :q
publicint getTotalPage(){ Bf'jXM{-
return totalPage; }%k"qW<Y
} <u2*(BM4
n#J$=@
/** ]; ^OY\,
* @param totalPage #(aROTV5a
* The totalPage to set. p6Z]oL q
*/ i $I|JJJ
publicvoid setTotalPage(int totalPage){ :-"J)^V
this.totalPage = totalPage; {]D!@87
} ziH2<@
j~Gu;%tq
} bq(*r:`"
[PX'Jer
X'?v8\mPK
&MQmu,4
5"@*?X K^
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 Ad8n<zt|
wLH>:yKUU
个PageUtil,负责对Page对象进行构造: ~O0 $Suv
java代码: y/{fX(aV
wC+u73599
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/*Created on 2005-4-14*/ XGWSdPJLr
package org.flyware.util.page; QzVnL U)
a=9:[
import org.apache.commons.logging.Log; C*_C;6.~Y
import org.apache.commons.logging.LogFactory; 5E;qM|Ns
.CABH,Po:
/** VcO0sa f`
* @author Joa SI-q C
* )e+>w=t
*/ ^z IW+:
publicclass PageUtil { F=e8 IUr
\BTODZ:h
privatestaticfinal Log logger = LogFactory.getLog zuad~%D<I
T{.pM4Hd
(PageUtil.class); ?m}s4a
:D6
ON"6
/** m)t;9J5
* Use the origin page to create a new page ]"hFC<w
* @param page m@2QnA[4
* @param totalRecords KNvZm;Q6
* @return gnOt+W8
*/ @ $ ;q;
publicstatic Page createPage(Page page, int hHGoP0/o
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totalRecords){ ]Idk:et
return createPage(page.getEveryPage(), :'-/NtV)o?
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page.getCurrentPage(), totalRecords); Eqd<