Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 A}(o1wuw
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 &W{v(@
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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 5 &0qr$
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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 TrBW0Bn>p
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。 [gj>ey8T
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分页支持类: mB"1QtD
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java代码: ;*WG9Y(W
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package com.javaeye.common.util; e/}4Pt
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import java.util.List; S:1g(f*85
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@ vo
publicclass PaginationSupport { zpZfsn!
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publicfinalstaticint PAGESIZE = 30; J|`.d46
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privateint pageSize = PAGESIZE; wZWAx
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privateList items; 1:J+`mzpl
IL`=r6\
privateint totalCount; t8`wO+4@
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privateint[] indexes = newint[0]; I{=Yuc
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privateint startIndex = 0; gyuBmY
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public PaginationSupport(List items, int |qBcE
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totalCount){ ]'pL*&"X
setPageSize(PAGESIZE); M~~)tJYsu
setTotalCount(totalCount); t(jE9t|2e6
setItems(items);
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setStartIndex(0); bAwKmk9C
} egVKAR-
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public PaginationSupport(List items, int zjOOEvi
#/{3qPN?@
totalCount, int startIndex){ BvUiH<-D
setPageSize(PAGESIZE); Y=5P=wE
setTotalCount(totalCount); 3 FV -&Y
setItems(items); F<XOt3VY.
setStartIndex(startIndex); QWtDZ>
} (e0(GOqf4
KC)}Mzt6_
public PaginationSupport(List items, int r-.>3J
YrV@k*O*
totalCount, int pageSize, int startIndex){ d</F6aM\
setPageSize(pageSize); nv\K!wZI=b
setTotalCount(totalCount); Qqs1%u;e8
setItems(items); 4u+0 )<
setStartIndex(startIndex); uqLP$At
} dCeLW
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publicList getItems(){ qG ? :Q
return items; n>w<vM
} Np aS2q-d
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publicvoid setItems(List items){ !F.h+&^D;
this.items = items; zTc*1(^
} Qj*.Z4ue
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publicint getPageSize(){ `.J17mQe"
return pageSize; >H ?k0M`L
} A\#z<h[>
1GK>&;
publicvoid setPageSize(int pageSize){ YV!hlYOBi
this.pageSize = pageSize; 2;0eW&e
} N$x&k$w R
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publicint getTotalCount(){ } `5k^J$x
return totalCount; tym:C7v%~
} ?)186dp
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publicvoid setTotalCount(int totalCount){ Z&U:KrFH
if(totalCount > 0){ uxB`
this.totalCount = totalCount; M X8|;t
int count = totalCount / hzRKv6
g5lb3`a3
pageSize; tRZ4\Bu
if(totalCount % pageSize > 0) .6xMLo,R
count++; bzxf*b1I
indexes = newint[count]; I7~) q`
for(int i = 0; i < count; i++){ ~f[ Y;
indexes = pageSize * mEsb_3?#+
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fi~
i; S0QLM)
} E2d'P
}else{ 8'%m!
this.totalCount = 0; y^ |u'XK
} ],k~t5+
} 7eAV2.
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publicint[] getIndexes(){ sRA2O/yKCE
return indexes; U3Z=X TB
} N9-7YQ`D
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publicvoid setIndexes(int[] indexes){ U||GeEd
this.indexes = indexes; `;J`O02
} YWvD+
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publicint getStartIndex(){ !ltq@8#_|
return startIndex; fBj)HoHQW
} >36,lNt
N+@ Ff3M
publicvoid setStartIndex(int startIndex){ 6-fv<Pn
if(totalCount <= 0) R$8{f:Pj
this.startIndex = 0; ,(pp+hNq
elseif(startIndex >= totalCount) 3h d30o
this.startIndex = indexes `Y5LAt:
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[indexes.length - 1]; %l!?d`?
elseif(startIndex < 0) {
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this.startIndex = 0; L*tfYonq
else{ kM{8zpn
this.startIndex = indexes bXOKC
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[startIndex / pageSize]; (u} /(Ux
} ]i@73h YT
} &UOxS W
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publicint getNextIndex(){ 2Y23!hw
int nextIndex = getStartIndex() + |w}j!}u
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pageSize; T7.Iqw3p
if(nextIndex >= totalCount) @$ Zh^+x!
return getStartIndex(); lz~^*\ F
else %DYh<U4N
return nextIndex; IBo
} <D ~hhGb
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publicint getPreviousIndex(){ W.MZN4=
int previousIndex = getStartIndex() - _huJ*W7lR
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pageSize; jDpA>{O[
if(previousIndex < 0) 94BH{9b5
return0; ={sjoMW
else z3K$gEve
return previousIndex; 3NLn}
} g"1V]
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}
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抽象业务类 JM|HnyI
java代码: jJ$B^Y"4
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/** V;xPZ2C;
* Created on 2005-7-12 J
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*/ #0aBQ+_8H
package com.javaeye.common.business; eTvWkpK+
;+E]F8G9r
import java.io.Serializable; "Zgwe,#
import java.util.List; EGUlLqP6e
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import org.hibernate.Criteria; *v+l,z4n
import org.hibernate.HibernateException; oxlor,lw/
import org.hibernate.Session; $h{m")]
import org.hibernate.criterion.DetachedCriteria; :^3 )[.m
import org.hibernate.criterion.Projections; ;rT'~?q
import cQ j`W
*
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org.springframework.orm.hibernate3.HibernateCallback; +9b{Y^^~T
import KHML!f=mu
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org.springframework.orm.hibernate3.support.HibernateDaoS S@HC$
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upport; w~b:9_reY
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import com.javaeye.common.util.PaginationSupport; \mc0fY
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public abstract class AbstractManager extends SWV*w[X<X
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HibernateDaoSupport { n?EgC8b9
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privateboolean cacheQueries = false; =#V^t$
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privateString queryCacheRegion; 4@
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publicvoid setCacheQueries(boolean -<s Gu9
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cacheQueries){ \N*([{X
this.cacheQueries = cacheQueries; 4=([v;fc
} 3Tl<ST\
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publicvoid setQueryCacheRegion(String @=Q!a (g
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queryCacheRegion){ \"a{\E,{;
this.queryCacheRegion = A9MM^jV8
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queryCacheRegion; u1%URen[x
} ^9[Q;=R
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publicvoid save(finalObject entity){ Food<(!.>
getHibernateTemplate().save(entity); Y~I<L ocv
} D!rPF)K
)
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publicvoid persist(finalObject entity){ bqcCA91
getHibernateTemplate().save(entity); AEyvljv
} 1|MRXK
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publicvoid update(finalObject entity){ h3CA,$HJ
getHibernateTemplate().update(entity); SndR:{
} ODxZO3
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publicvoid delete(finalObject entity){ la3B`p
getHibernateTemplate().delete(entity); jzbq{#
} (I>Ch)'
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publicObject load(finalClass entity, dz_S6o ]
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finalSerializable id){ =fcg4h5(
return getHibernateTemplate().load _ox+5?>
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(entity, id); Za:j;u
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} &jP1Q3
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publicObject get(finalClass entity, Nc:s+ o
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finalSerializable id){ R /+$ :
return getHibernateTemplate().get |\,OlX,
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(entity, id); vF27+/2+R
} S+T/(-W
h aAY =:
publicList findAll(finalClass entity){ ')"+ a^c
return getHibernateTemplate().find("from |?!i},Ki;
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" + entity.getName()); 3z8i0
} U)J5K
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publicList findByNamedQuery(finalString !zA@{gvEc
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namedQuery){ YZol4q|ic
return getHibernateTemplate y}?|+/ dN
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().findByNamedQuery(namedQuery); Pxlc RF
} %O"8|ZG9{
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publicList findByNamedQuery(finalString query, ^D+J
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finalObject parameter){ I!sT=w8V
return getHibernateTemplate 2*:q$ c
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().findByNamedQuery(query, parameter); C96/
} R_!.vGhkN
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publicList findByNamedQuery(finalString query, 8z9{H
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finalObject[] parameters){ aB,-E>+
return getHibernateTemplate 5'zXCHt
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().findByNamedQuery(query, parameters); HlGSt$woX
} +,76|oMsQ%
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publicList find(finalString query){ 7UfNz60+~
return getHibernateTemplate().find 4>KF`?%4
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(query); 7r:h_r-
} '~[8>Q>
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publicList find(finalString query, finalObject XNz+a|cF
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parameter){ EeuYRyK
return getHibernateTemplate().find EQ1**[$
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(query, parameter); zHJCXTM
} s)^/3a
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public PaginationSupport findPageByCriteria )^j_O^T5
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(final DetachedCriteria detachedCriteria){ p+d-7'?I
return findPageByCriteria x?h/e;
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ]VI^ hhf
} ]E`<8hRB
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public PaginationSupport findPageByCriteria lTx_E#^s
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(final DetachedCriteria detachedCriteria, finalint zx.qN
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startIndex){ S=UuEmU5N
return findPageByCriteria cAWn*%
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(detachedCriteria, PaginationSupport.PAGESIZE, IKD{3cVL
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startIndex); |L2>|4
} SQodk:1)
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public PaginationSupport findPageByCriteria Blpk
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(final DetachedCriteria detachedCriteria, finalint yJA~4
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pageSize, :/5m
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finalint startIndex){ }`tSRB7
return(PaginationSupport) sZ `Tv[
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getHibernateTemplate().execute(new HibernateCallback(){ ;4F6
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publicObject doInHibernate R/hf"E1
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(Session session)throws HibernateException { KOcB#UHJ
Criteria criteria = Bkcwl
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detachedCriteria.getExecutableCriteria(session); ^m\o(R
int totalCount = Kd\0nf6
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((Integer) criteria.setProjection(Projections.rowCount j\y;~
V
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()).uniqueResult()).intValue(); ^z?b6kTC
criteria.setProjection !cW rB9
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(null); 3[m~-8
List items = @r"\bBi
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criteria.setFirstResult(startIndex).setMaxResults Oa[
%|-N{> wKy
(pageSize).list(); WgNA%.|,
PaginationSupport ps = C=?S
X 4;U4pU#
new PaginationSupport(items, totalCount, pageSize, (J:+'u
]!hjKu"
startIndex); o_:v?Y>0
return ps; )%(ZFn}
} BA;r%?MRL
}, true); M8},RR@{
} MO`Y&<g~A
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public List findAllByCriteria(final J
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DetachedCriteria detachedCriteria){ ~D52b1f
return(List) getHibernateTemplate P\U<,f
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().execute(new HibernateCallback(){ OSu&vFKz
publicObject doInHibernate >M<3!?fW)
@6
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(Session session)throws HibernateException { 8Pn
Criteria criteria = TvU
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detachedCriteria.getExecutableCriteria(session); 1XGg0SC
return criteria.list(); )GB#"2
} nrEI0E9
}, true); _>gz&
} =
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public int getCountByCriteria(final GS;GJsAs
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DetachedCriteria detachedCriteria){ ^y5A\nz&
Integer count = (Integer) G ek?+|m
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getHibernateTemplate().execute(new HibernateCallback(){ L8 P0bNi
publicObject doInHibernate LuS@Kf8N+
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(Session session)throws HibernateException { H<Snp)
Criteria criteria = SmXoNiM"y
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detachedCriteria.getExecutableCriteria(session); ~Ntk-p
return T3w%y`K
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criteria.setProjection(Projections.rowCount g/GI'8EMj
y0%@^^-Ru
()).uniqueResult(); } z'Jsy[s
} [LVXXjkFI
}, true); |$WHw*F^
return count.intValue(); 9*"
} -]3 K#M)s
} (UkP AE
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用户在web层构造查询条件detachedCriteria,和可选的 %\'=Y/yP
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 prJd'
ne#dEUD
PaginationSupport的实例ps。 '|C%X7
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ps.getItems()得到已分页好的结果集 . ,|C>^
ps.getIndexes()得到分页索引的数组 e@3SF
ps.getTotalCount()得到总结果数 C:Ef6ZW
ps.getStartIndex()当前分页索引 := V?;
ps.getNextIndex()下一页索引 k+J3Kl09hM
ps.getPreviousIndex()上一页索引 geQ!}zXWi
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 '54\!yQ<{
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 #`Su3~T=S
eWH0zswG
一下代码重构了。 ~WA@YjQ]
tZ]gVgZg
我把原本我的做法也提供出来供大家讨论吧: rPk|2l,E,3
}Rh\JDiQ
首先,为了实现分页查询,我封装了一个Page类: z5@XFaQ
java代码: D]~K-[V?l
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/*Created on 2005-4-14*/ 3kxo1eb
package org.flyware.util.page; Sca"LaW1
3lF"nv
/** (cj9xROx
* @author Joa 6Zi{gx
* I%d=c0>%
*/ -y.cy'$f
publicclass Page { >LBA0ynh
{
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/** imply if the page has previous page */ a_N7X
privateboolean hasPrePage; Us`=^\
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/** imply if the page has next page */ u^MKqI
privateboolean hasNextPage; ~&Z>fgOTJ
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/** the number of every page */ ) .KA0-
privateint everyPage; 5]O{tSj
gWj-@o\
/** the total page number */ B.N#9u-vW
privateint totalPage; ` o)KG,
7xnj\9$m
/** the number of current page */ ZTR9e\F
privateint currentPage; N
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< $zJi V
/** the begin index of the records by the current 'lIs`Zc5N
ysnW3q!@
query */ 5>}$]d/o
privateint beginIndex; rbvk.:"^w
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/** The default constructor */ HXq']+iC
public Page(){ JM7mQ'`Ud
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} ~& -h5=3
5RPG3ppS
/** construct the page by everyPage B&cIx~+
* @param everyPage r;Sk[Y5#
* */ u=:f%l
public Page(int everyPage){ /+*"*Br/
this.everyPage = everyPage; bZ*=fdh
} u99a"+
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/** The whole constructor */
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public Page(boolean hasPrePage, boolean hasNextPage, F`g(vD>
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=MNp;
int everyPage, int totalPage, yGR{-YwU!
int currentPage, int beginIndex){ *OLqr/ yb
this.hasPrePage = hasPrePage; 1Q@]b_"Xh
this.hasNextPage = hasNextPage; .UPh
this.everyPage = everyPage; `7/(sX.
this.totalPage = totalPage; KF(H
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this.currentPage = currentPage; 4aO/^Hl
this.beginIndex = beginIndex; =:rg1wo"c
} $tZ
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/** SAP/jD$5]>
* @return N{%7OG
* Returns the beginIndex. 8'PZA,CW
*/ fo ~uI(rk
publicint getBeginIndex(){ wm~7`&
return beginIndex; 3U<m\A1
} ceUe*}\cr
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/** Ge?Wmq>
* @param beginIndex I=dG(?#7%
* The beginIndex to set. [=K
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*/ $toTMah
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publicvoid setBeginIndex(int beginIndex){ qFm w9\Fn
this.beginIndex = beginIndex; )]@h}K}
} cx[^D,usf~
:[CV_ME.;
/** }$_@yt<{W@
* @return 8?Zhh.
* Returns the currentPage. C hF~
*/ Y-ao
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publicint getCurrentPage(){ Q^b&
return currentPage; "D'e
} Yw|v5/>
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/** PYCN3s#Gi
* @param currentPage sh
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* The currentPage to set. M=iTwK
*/ @j|E"VYY
publicvoid setCurrentPage(int currentPage){ &5 "!0
this.currentPage = currentPage; Tz1^"tx9
} i(4<MB1a
@j\:K<sk
/** :+\0.\K0!
* @return %#2$B+
* Returns the everyPage. B0Df7jr%`>
*/ LdZVXp^
publicint getEveryPage(){ SA TX_
return everyPage; ~P|;Y<?3
} ?~o`mg
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/** j4/[Z'5ny
* @param everyPage s!IIvF
* The everyPage to set. 3-/|G-4k7
*/ ]y@A=nR
publicvoid setEveryPage(int everyPage){ Da-Lf2qT9
this.everyPage = everyPage; x?L[*N_ml
} t'U=K>7
HPphTu}`
/** +[G9PP6
* @return qHk{5O3
* Returns the hasNextPage. 7( 84j5zb
*/ e"hfeNphz
publicboolean getHasNextPage(){ Uj5-x%~
return hasNextPage; QP\9#D~
} gWr7^u&q@|
'WW:'[Syn'
/** @}
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* @param hasNextPage cQEUHhRg!
* The hasNextPage to set. FI^Wh7J
*/ FOF@@C~aH
publicvoid setHasNextPage(boolean hasNextPage){ Lap?L/NS
this.hasNextPage = hasNextPage; %Y&48''"
} M/ 64`lcb
j!4{+&Laq
/** X /c8XLe"
* @return JVoC2Z<
* Returns the hasPrePage. 9'*7 (j;
*/ f./K/
publicboolean getHasPrePage(){ H_?rbz} o
return hasPrePage; z"4 q%DC
} Kg6J:HD49
f\
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/** k{2Gq1S{
* @param hasPrePage 33~MP;
* The hasPrePage to set. s*PKr6X+
*/ <1*kXTN(
publicvoid setHasPrePage(boolean hasPrePage){ Tf3CyH!k
this.hasPrePage = hasPrePage; S/E&&{`ls
} "WKOlfPa
QATRrIj{e
/** Bc8&-eZ,
* @return Returns the totalPage. J.UNw8z
* c4AJ`f.5
*/ naR<
publicint getTotalPage(){ d`/8Q9tQ
return totalPage; wh(_<VZ
} KkUK" Vc
KPToyCyR1
/** A}lxJ5h0
* @param totalPage %mQ&pk
* The totalPage to set. as@8L|i*
*/ qxI$F
publicvoid setTotalPage(int totalPage){ ?-j/X6(\(
this.totalPage = totalPage; ^Q#_
} %2:UsI
^0zfQu+!
} 5'set?
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7L
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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}5
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个PageUtil,负责对Page对象进行构造: Qhj']>#g
java代码: 1i#y>fUj
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;y(;7n_ a
/*Created on 2005-4-14*/ 9JdJn>
package org.flyware.util.page; ;Ci:d*
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import org.apache.commons.logging.Log; L"jA#ULg
import org.apache.commons.logging.LogFactory; qIJc\,'
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/** suQTi'K1
* @author Joa $R'?OK(`
* -1dD~S$
*/ >T;!Z 5L1
publicclass PageUtil { $TK*w8@:
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privatestaticfinal Log logger = LogFactory.getLog bhD-;Y!6;
!Q"L)%)'A
(PageUtil.class); -Y524
}aOqoi7w
/** 8Ay7I
* Use the origin page to create a new page 8(Az/@=n
* @param page ~g!!#ad
* @param totalRecords p*PzfSLN
* @return N~]qQoj,
*/ +Kgl/Wg%
publicstatic Page createPage(Page page, int %fF,Fnf2
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totalRecords){ v(;yy{>8"
return createPage(page.getEveryPage(), ]?]M5rP
Z=8&`
page.getCurrentPage(), totalRecords); ,<Cl^ ^a,
} -,/7u3
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/** ';G/,wB?`
* the basic page utils not including exception 4AL,=C3
PV\J]
|d,%
handler ~0,v Q
* @param everyPage c!HGiqp
* @param currentPage oOprzxf"+Z
* @param totalRecords *m]Y6
* @return page {*;8`+R&
*/ !%$[p'
publicstatic Page createPage(int everyPage, int bYLYJ`hH<R
x"Ll/E)\v]
currentPage, int totalRecords){ Pt85q?- >
everyPage = getEveryPage(everyPage); _xAru9=n^
currentPage = getCurrentPage(currentPage); vk|f"I
int beginIndex = getBeginIndex(everyPage, B{\Y~>]Pj
KGDN)@D
currentPage); tC'#dU`=qY
int totalPage = getTotalPage(everyPage, rL\}>VC)
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totalRecords); 3~fi#{
boolean hasNextPage = hasNextPage(currentPage, :JSxsA6k
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totalPage); SOG(&)b
boolean hasPrePage = hasPrePage(currentPage); GI{EP&