Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 X9SJ~n
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 gr[D!D>
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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 XNy:0C
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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 f.sPE8#3=
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分页支持类: H)-L%l|9
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java代码: l[:^TfB
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package com.javaeye.common.util; G;87in ,}
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import java.util.List; `W6:=H
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publicclass PaginationSupport { Z{Lmd`<w`j
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publicfinalstaticint PAGESIZE = 30; 0q-0zXlSL
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privateint pageSize = PAGESIZE; Z:W')Nd(
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privateList items; |E>v~qD8I
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privateint totalCount; +ytT)S
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privateint[] indexes = newint[0]; f]O5V$!RuE
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privateint startIndex = 0; e)fJd*P
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public PaginationSupport(List items, int 9u-M! $
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totalCount){ I_R5\l}O+D
setPageSize(PAGESIZE); TZvBcNi
setTotalCount(totalCount); &z{dr~
setItems(items); *RUd!]bh
setStartIndex(0); VuYWb)@
} ^H@!)+
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public PaginationSupport(List items, int 0%(4G83gw
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totalCount, int startIndex){ WHdqO8
setPageSize(PAGESIZE); j};pv 2
setTotalCount(totalCount); >vNk kxWyQ
setItems(items); sWqPw}/3>
setStartIndex(startIndex); }kgjLaQ^N
} M4L~bK
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public PaginationSupport(List items, int 59"Nn\}3gE
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totalCount, int pageSize, int startIndex){ Huug_E+
setPageSize(pageSize); `SSP53R(0
setTotalCount(totalCount); J%O[@jX1
setItems(items); NoSqzJyh
setStartIndex(startIndex); W}<M?b4tP
} "OlI-^y
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publicList getItems(){ NUxAv= xl
return items; .wt>.mUH
} XQ+-+CD
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publicvoid setItems(List items){ _mI:Lr#dT
this.items = items; Y`[HjS,
} l72ie
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publicint getPageSize(){ 5Fl
return pageSize; H8=vQy
} /(WX!EEsB
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publicvoid setPageSize(int pageSize){ Npg5Z%+y
this.pageSize = pageSize; 0N}
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} hoSU`X
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publicint getTotalCount(){ XyKKD&j
return totalCount; s1*WK&@
} D;
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publicvoid setTotalCount(int totalCount){ JVIcNK)
if(totalCount > 0){ "8C(_z+]K`
this.totalCount = totalCount; k*UR#z(I
int count = totalCount / :BrnRW64
^QHMN 7r/
pageSize; )oz-<zW
if(totalCount % pageSize > 0) e5:l 6`
count++; =O}%bZ)Q
indexes = newint[count]; 8zB+%mcF
for(int i = 0; i < count; i++){ 5e~{7{
indexes = pageSize * #/
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i; ,:Rq
} 6lH>600]u
}else{ @Tm0T7C
this.totalCount = 0; EssUyF-jwU
} -$!Pf$l@
} Af!
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publicint[] getIndexes(){ *F4G qX3
return indexes; 6u]OXPA|
} 80l3.z,:
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publicvoid setIndexes(int[] indexes){ 1H2u,{O
this.indexes = indexes; KI?1(L
} yrvSbqR
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publicint getStartIndex(){ SUFaHHk@/b
return startIndex; m} FCe
} O.40^u~
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publicvoid setStartIndex(int startIndex){ &V,-W0T_
if(totalCount <= 0) AQBx
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this.startIndex = 0; `X]2iz
elseif(startIndex >= totalCount) 1wH/ #K
this.startIndex = indexes HU.6L'H*
Ul~}@^m]4}
[indexes.length - 1]; Uc%`? +Q
elseif(startIndex < 0) }?ac<> u&
this.startIndex = 0; J Wyoh|
else{
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this.startIndex = indexes Zv7$epDUz
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[startIndex / pageSize]; 4>ce,*B1
} b<8J ;u<
} '/"M02a
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publicint getNextIndex(){ ~>-;(YU"t
int nextIndex = getStartIndex() + #p9z#kin
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pageSize; `?S?)0B
if(nextIndex >= totalCount) 5t1DB'K9$_
return getStartIndex(); 5<GRi"7A@
else <?va)
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return nextIndex; L5N{ie_
} e^fKatI1
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publicint getPreviousIndex(){ v(nQd6;T
int previousIndex = getStartIndex() - ';L^mxh
Chi<)P$^
pageSize; kk7:A0._
if(previousIndex < 0) ~X(xa
return0; w!9W Cl]9M
else k^%ec3l
return previousIndex; ,8 NEnB
} l$~bkVNL
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} +Q#Qu0_
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抽象业务类 '!L1z45
java代码: ob5nk^y
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/** :H8L (BsI
* Created on 2005-7-12 g[+Q~/yq
*/ ZJ}LnPr
package com.javaeye.common.business; .Qw@H#dtW
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import java.io.Serializable; N'BctKL
import java.util.List; T-8nUo}i
Y/I6.K3
import org.hibernate.Criteria; aZCT|M1
import org.hibernate.HibernateException; pC.T)k
import org.hibernate.Session; : )*Ge3
import org.hibernate.criterion.DetachedCriteria; m-FDCiN>
import org.hibernate.criterion.Projections; &B,& *Lp
import .E8p-R5)V>
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org.springframework.orm.hibernate3.HibernateCallback; 7?WBzo!!L
import cTx/Y&\9
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org.springframework.orm.hibernate3.support.HibernateDaoS o[ W3/
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upport; cZT.vA#
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import com.javaeye.common.util.PaginationSupport; 05LQh
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public abstract class AbstractManager extends 3NZFW{u
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HibernateDaoSupport { 2 3w{h d
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privateboolean cacheQueries = false; i1Sc/
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privateString queryCacheRegion; JJ3JULL2
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publicvoid setCacheQueries(boolean A+E@OO w*~
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cacheQueries){ :R\v# )C
this.cacheQueries = cacheQueries; eyjUNHeh#
} :Aiu!}\
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publicvoid setQueryCacheRegion(String sBI%lrO
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queryCacheRegion){ "(VcYQ+
this.queryCacheRegion = = }lA|S
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queryCacheRegion; M:f=JuAx
} jc`',o'[+
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publicvoid save(finalObject entity){ s""8V_,;
getHibernateTemplate().save(entity); ~o5iCt;w
} PzkXrDlB7
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publicvoid persist(finalObject entity){ m6<0 hP
getHibernateTemplate().save(entity); -s "$I:v
} fOervo
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publicvoid update(finalObject entity){ ,X6j$YLWp
getHibernateTemplate().update(entity); x^skoz
} oF^hq-xcP
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publicvoid delete(finalObject entity){ `I{Q,HQ7
getHibernateTemplate().delete(entity); c)fp;^
} 8{t&8Ql n
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publicObject load(finalClass entity, 5)<jPyC
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finalSerializable id){ 0lN8#k>H
return getHibernateTemplate().load :[03upyS
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(entity, id); 7E)7sd
} a[ l5k
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publicObject get(finalClass entity, dq(L1y870
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finalSerializable id){ 4=:eGlU93U
return getHibernateTemplate().get @1Lc`;Wd
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(entity, id); ZfikNQU9r
} Mp=+*I[
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publicList findAll(finalClass entity){ /=} vPey
return getHibernateTemplate().find("from ^4NH.q{
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" + entity.getName()); j-|0&X1C
} zSCPp6
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publicList findByNamedQuery(finalString s$6#3%h
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namedQuery){ "ukbqdKD
return getHibernateTemplate D*,H%xA
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().findByNamedQuery(namedQuery); o-=lH tR
} B35f5m7r
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publicList findByNamedQuery(finalString query, }iAi`_\0;
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finalObject parameter){ #9Z-Hd<
return getHibernateTemplate &nProzC
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gc
().findByNamedQuery(query, parameter); {jG`l$$
} ,cEcMaJ
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publicList findByNamedQuery(finalString query, pC8i&_A
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finalObject[] parameters){ ic#drpl,
return getHibernateTemplate
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().findByNamedQuery(query, parameters); 1[]cMyV
} DUr1s]+P
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publicList find(finalString query){ _jz=BRO$
return getHibernateTemplate().find <
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k#n=mm'N9
(query); m
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} h6t>yC\
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publicList find(finalString query, finalObject eGil`:JY"
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parameter){ (6{
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return getHibernateTemplate().find jFfki.H
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(query, parameter); y[rLk
} 8>9+w/DL
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public PaginationSupport findPageByCriteria X;NTz75
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(final DetachedCriteria detachedCriteria){ ~T~v*'_h
return findPageByCriteria #v-!GK_<
./'n2$^3
(detachedCriteria, PaginationSupport.PAGESIZE, 0); ?da 3Azp
} IpxjP\
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public PaginationSupport findPageByCriteria 7F4]EA^
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(final DetachedCriteria detachedCriteria, finalint .$iIr:Tc>
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startIndex){ i}19$x.D`
return findPageByCriteria 8Yh2K}
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(detachedCriteria, PaginationSupport.PAGESIZE, JSU\Hh!
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startIndex);
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} <4g^c&
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public PaginationSupport findPageByCriteria /v[-KjTj7
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(final DetachedCriteria detachedCriteria, finalint |=POV]K
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pageSize, (Wn'.|^%
finalint startIndex){ V|)>
return(PaginationSupport) XvdhPOMy
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getHibernateTemplate().execute(new HibernateCallback(){ -)@.D>HsOt
publicObject doInHibernate 6D],275`J
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(Session session)throws HibernateException { UL/>t}AG
Criteria criteria = P7b2I=t
,o)MiR9-[A
detachedCriteria.getExecutableCriteria(session); ,n*.Yq
int totalCount = 5kF5`5+Vj
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((Integer) criteria.setProjection(Projections.rowCount iYf4 /1IG,
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()).uniqueResult()).intValue(); C6n4OU
criteria.setProjection SxDE3A-:
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(null); N+\*:$>zt6
List items = IjNm/${$
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criteria.setFirstResult(startIndex).setMaxResults zP9!fA
yrjm0BM#
(pageSize).list(); RY'y%6Z]ZO
PaginationSupport ps = 7XNfH@
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8z
new PaginationSupport(items, totalCount, pageSize, 61'7b`:(hi
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startIndex); NQAnvX;
return ps; {x8`gP\H
} j!s&yHE1
}, true); b Y>Ug{O;
} J: LSGj;R
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public List findAllByCriteria(final G 1$l %B
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DetachedCriteria detachedCriteria){ "a: ;
return(List) getHibernateTemplate `G'V9Xs(
3 yElN.=
().execute(new HibernateCallback(){ 8<^,<?
publicObject doInHibernate
lcr=^
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(Session session)throws HibernateException { ctZW7
Criteria criteria = 6"DvdJ0MB
'/j`j>'!^
detachedCriteria.getExecutableCriteria(session); 1Jahu!c?
return criteria.list(); E8xXr>j>#
} mK4a5H
}, true); ;cO0Y.V9l
} >eC^]#c
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public int getCountByCriteria(final ZD,l2DQ?
8[DD=[&
DetachedCriteria detachedCriteria){ 4MM#\
Integer count = (Integer) !-QKh aY
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getHibernateTemplate().execute(new HibernateCallback(){ F4}Zl
publicObject doInHibernate _ehU:3L`s
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(Session session)throws HibernateException { ESs)|t h
Criteria criteria = h*d,AJz &.
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detachedCriteria.getExecutableCriteria(session); (~P&$$qfD
return ;'h7
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criteria.setProjection(Projections.rowCount )S%mKdOm
$
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()).uniqueResult(); xWD wg@ P
} ?*T`a oB
}, true); +z4NxR
return count.intValue(); G67BQG\av
} iz'8P-]K>
} dI>oHMC
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用户在web层构造查询条件detachedCriteria,和可选的 8\yH7H
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 K9*K4'#R
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PaginationSupport的实例ps。 JK1b68n
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ps.getItems()得到已分页好的结果集 t*DM^.@
ps.getIndexes()得到分页索引的数组 F/!C=nS
ps.getTotalCount()得到总结果数 v7ae^iU
ps.getStartIndex()当前分页索引 #&@&BlIe
ps.getNextIndex()下一页索引 5'o.v^l
ps.getPreviousIndex()上一页索引 OxD\e5r
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 @<};Bo'
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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 iBZ+gsSP
&o?pZ(\C
一下代码重构了。 kh`X92~
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我把原本我的做法也提供出来供大家讨论吧: Me8d o;
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首先,为了实现分页查询,我封装了一个Page类: t'z]<7
java代码: %TLAn[LW(
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/*Created on 2005-4-14*/ 6Fm.^9@
package org.flyware.util.page; Jus)cO#I
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/** xUG|@xIwc
* @author Joa = U^B,q
* LIR2B"3F
*/ .M_;mhRI
publicclass Page { ~zuMX;[
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/** imply if the page has previous page */ ^@6eN]
privateboolean hasPrePage; ^m5{:\
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/** imply if the page has next page */ 5Wn6a$^
privateboolean hasNextPage; iG<|3I
js>6Du
/** the number of every page */ d 5Il0sG
privateint everyPage; $H_4Y-xOi
>s1HQSe66
/** the total page number */ h<6r+*T' p
privateint totalPage; E[$['0
@
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/** the number of current page */ -8EdTc@
privateint currentPage; )Dv"seH.
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/** the begin index of the records by the current '2%hc\P6P
_/KW5
query */ vK6bpzI
3
privateint beginIndex; 5uu{f&?u)
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/** The default constructor */ )>=`[$D1t
public Page(){ hwexv 9""
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} [7$<sN<'
s cn!,
/** construct the page by everyPage ^6Xi o6W
* @param everyPage `RjcJ?r
* */ H-I*;
public Page(int everyPage){ 6k^vF~
this.everyPage = everyPage; u]zb<)'_
} 9%)'QDVGLf
;T/' CD
/** The whole constructor */ ~kYF/B2*
public Page(boolean hasPrePage, boolean hasNextPage, RRV&!<l@$
,PY<AI^59
H 9&?<j1n
int everyPage, int totalPage, SH5k^EJ
int currentPage, int beginIndex){ L:'Y#VI{
this.hasPrePage = hasPrePage; S_\RQB\l
this.hasNextPage = hasNextPage; t);5Cw_
this.everyPage = everyPage; Cu!4ha.e`
this.totalPage = totalPage; J H$
this.currentPage = currentPage; uz*C`T0:rj
this.beginIndex = beginIndex; t[3Upe%
} 8^M5u>=t;
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/** _msDf2e9
* @return !4
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* Returns the beginIndex. :CH'Bt4<
*/ {Q4=GrS
publicint getBeginIndex(){ J,IOp-
return beginIndex; ^up*KQ3u\
} N["(ZSS
:s8,i$Ex
/** "i#!
* @param beginIndex <nIU]}q
* The beginIndex to set. z.{yVQE
*/ b5yb~;0
publicvoid setBeginIndex(int beginIndex){ );=JoRQ{
this.beginIndex = beginIndex; }p&aI?-B
} |4dNi1{Zd
Z5NuLB'
/** dLjT^ 9
* @return 6C)OO"Bc
* Returns the currentPage. 76c}Rk^
*/ S~m*t i(
publicint getCurrentPage(){ s2v\R~T
return currentPage; B{zIW'Ld
} G-rN?R.
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/** GZO,]%z
* @param currentPage
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* The currentPage to set. ZtIK"o-|!
*/ L@v0C)
publicvoid setCurrentPage(int currentPage){ #`?uV)(
this.currentPage = currentPage; b>fDb J0
} Xf#uK\f
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/** fDqlN`P@
* @return smk0 *m4
* Returns the everyPage. Ot v{#bB$
*/ 4;%=ohD:!
publicint getEveryPage(){ ))eR
return everyPage; js2?t~E]
} 8lbNw_U
|/rBR!kPq
/** L V9\
* @param everyPage bZa?h.IF
* The everyPage to set. c L84}1QD
*/ KxiZx I
publicvoid setEveryPage(int everyPage){ M"~B_t,Nw
this.everyPage = everyPage; &0Nd9%>
} /@on=~
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/** 6`EyzB%.$
* @return }<S|_F
* Returns the hasNextPage. &4DvZq=
*/ Hjlx,:'M
publicboolean getHasNextPage(){ na%9E8;:&v
return hasNextPage; pW!]
} ' Bdvqq
zYH6+!VBH#
/** UIzk-.<
* @param hasNextPage p61"a,Xc
* The hasNextPage to set. 5% +T~ E*
*/ YMz[je
publicvoid setHasNextPage(boolean hasNextPage){ _"z#I
CT(
this.hasNextPage = hasNextPage; :Rq@ %rL
} &
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=axi0q?}
/** S0kH/A
* @return [_b10Z'{
* Returns the hasPrePage. SkN^ytKE
*/ JB**z00;
publicboolean getHasPrePage(){ y:pypuwt;
return hasPrePage; 'O2{0
} ];oED?I
yUBic~S
/** <sd
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* @param hasPrePage XMuZ'I
* The hasPrePage to set. im*XS@Uj
*/ s2&UeYbIs
publicvoid setHasPrePage(boolean hasPrePage){ arDY@o~
this.hasPrePage = hasPrePage; <o
p !dS
} o1YhYA
/n(0nU[
/** MQp1j:CK
* @return Returns the totalPage. 7dxY07yu
* Z;lE-`Z*(F
*/ O+(Z`,^
publicint getTotalPage(){ 7%L-;xcr]B
return totalPage; Y$Fbi2A4
} ]}C#"Xt
./.E=,j
/** wxvt:==
* @param totalPage T,jxIFrF
* The totalPage to set. ,ad~6.Z_)
*/ 0wxQ,PI1'
publicvoid setTotalPage(int totalPage){ "<bL-k*H)
this.totalPage = totalPage; gTiDV{Ip
} Ho*S>Y
}|Cw]GW
} EYMwg_
A qE,zW
+U@P+;
i Ri1E;
vFy/
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 R"K{@8b
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个PageUtil,负责对Page对象进行构造: Zni8im,_j
java代码: W._vikR
m_U__CZ}Tt
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/*Created on 2005-4-14*/ 7dN]OUdi
package org.flyware.util.page; RrGS$<
_MnMT9
import org.apache.commons.logging.Log; kU4Zij-O
import org.apache.commons.logging.LogFactory; ;Mw9}Reh@
-O. MfI+
/** {. eC"
* @author Joa nhQ.U>&-M
* 9?l(
}S`
*/ (#7pGGp*E
publicclass PageUtil { w QwY_ _
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privatestaticfinal Log logger = LogFactory.getLog vy6NH5Q
>0B[
(PageUtil.class); p8o%H-Xk
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/** R3%T}^;f
* Use the origin page to create a new page m[]pIXc(
* @param page 9sJbz=o]r
* @param totalRecords CSwNsFDR%
* @return Hm%[d;Z7
*/ V<nh+Q3<d
publicstatic Page createPage(Page page, int Zna
}h{
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totalRecords){ Za4 YD
return createPage(page.getEveryPage(), C n4|qX"&t
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page.getCurrentPage(), totalRecords); Q y$8!(
} >aN@)=h}
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/** {ZN{$Ad3/
* the basic page utils not including exception 6WI_JbT~
[,xFk* #
handler B<LQ;n+
* @param everyPage .|x0du|
* @param currentPage b<Pjmb+
* @param totalRecords sRt|G
* @return page P4Wd=Xoz6
*/ (47jop0RDQ
publicstatic Page createPage(int everyPage, int jAN(r>zVL
Ff%m.A8d,4
currentPage, int totalRecords){ l.fNkLC#
everyPage = getEveryPage(everyPage); l<GRM1^kU
currentPage = getCurrentPage(currentPage); I\`:(V
int beginIndex = getBeginIndex(everyPage, B3)#Ou2
GsE?<3
currentPage); |LiFX5!\
int totalPage = getTotalPage(everyPage, 7u o4F=%
k:`^KtBMl
totalRecords); ]^ZC^z;H
boolean hasNextPage = hasNextPage(currentPage, .#rI9op
K#+TCZ,
totalPage); &=@R,
boolean hasPrePage = hasPrePage(currentPage); YVD%GJ
Y13IrCA2
returnnew Page(hasPrePage, hasNextPage, }#w>>{Q
everyPage, totalPage, ^EZ)NG=e5
currentPage, S7~yRIjB
~8}"X] 4
beginIndex); =]U[
} V4/eGh_T
,Sghi&Ky
privatestaticint getEveryPage(int everyPage){ F''4 j8
return everyPage == 0 ? 10 : everyPage; z8vFQO\I"
} FSc730rM
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privatestaticint getCurrentPage(int currentPage){ HgduH::\#
return currentPage == 0 ? 1 : currentPage; zVkHDT[
} 0z.`
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privatestaticint getBeginIndex(int everyPage, int q35%t61Lc
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currentPage){ <J[*~v%(
return(currentPage - 1) * everyPage; &{ntx~Eq
} wz>j>e6k`
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privatestaticint getTotalPage(int everyPage, int z4H!b+
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totalRecords){ TS-m^Y'R
int totalPage = 0; |~#!e}L(
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if(totalRecords % everyPage == 0) BU]9eF!>h
totalPage = totalRecords / everyPage; @*A(#U8p3
else O_(J',++
totalPage = totalRecords / everyPage + 1 ; 1B,RRHXn6
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return totalPage; SYa!IL-B
} 2R:['QT
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privatestaticboolean hasPrePage(int currentPage){ "AUY+ LN
return currentPage == 1 ? false : true; _pjpPSV6J
} s:w LEj+
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privatestaticboolean hasNextPage(int currentPage, @ iao"&
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int totalPage){ DV{Qbe#In
return currentPage == totalPage || totalPage == B7N?"'$i
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0 ? false : true; JcvK]x
} 9QWS[E4
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} a+r0@eFLc
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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。 IBnJ6(.
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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 Z78&Ib