Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 TykT(=
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 EOPx4+o
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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 }T5@P {3P3
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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 ^:9a1 {L[
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分页支持类: fRp]
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java代码: n,I3\l9
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package com.javaeye.common.util; D(b01EQ;d
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import java.util.List; -L2.cN_
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publicclass PaginationSupport { $5nMD=
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publicfinalstaticint PAGESIZE = 30; r@G*Fx8Z
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privateint pageSize = PAGESIZE; ?sfqg gi
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privateList items; &raqrY|V
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privateint totalCount; |Xt G9A>
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privateint[] indexes = newint[0]; X [Y0r
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privateint startIndex = 0; %m&6'Rpfk
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public PaginationSupport(List items, int qxZIH
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totalCount){ y-<.l=6A
setPageSize(PAGESIZE); Nd8>p.iqO
setTotalCount(totalCount);
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setItems(items); 8/e-?2l
setStartIndex(0); -CPtYG[s
} 7x)Pt@c
jAJ='|[X\
public PaginationSupport(List items, int 3,PR6a,b'
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totalCount, int startIndex){ ^PG"
setPageSize(PAGESIZE); O9ex=m `L
setTotalCount(totalCount); 0`/G(ukO
setItems(items); ,dC.|P' `
setStartIndex(startIndex); WJ{Iv] }9
} 7_~ A*LM
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public PaginationSupport(List items, int H'AN osv
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totalCount, int pageSize, int startIndex){ Emlj,c<?j
setPageSize(pageSize); *)m:u :
setTotalCount(totalCount); 5c- P lm%
setItems(items); Dka,v
setStartIndex(startIndex); C-M_:kQ[U
} +p 6Ty2rz
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publicList getItems(){ (p]FI# y
return items; *_D/_Rp7
} N{J
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publicvoid setItems(List items){ la[pA
this.items = items; XgxE M1(
} 2w|5SK_
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publicint getPageSize(){ /HIyQW\Ki-
return pageSize; %.Y5%TyP
} !h?HfpYv
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publicvoid setPageSize(int pageSize){ _8G
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this.pageSize = pageSize; bBIh}aDN
} G'|ql5Zw
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publicint getTotalCount(){ W3:j Z:
return totalCount; aoy Be|H~=
} {4_s:+v0
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publicvoid setTotalCount(int totalCount){ i'fw>-0
if(totalCount > 0){ M CC4'
this.totalCount = totalCount; 3.W[]zH/u
int count = totalCount / @CNJpQ ujn
pg{VKrT`
pageSize; F
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if(totalCount % pageSize > 0) pRQ7rT',v
count++; TV{GHB!p"
indexes = newint[count]; ~5
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for(int i = 0; i < count; i++){ 3IxC@QR
indexes = pageSize * t/|0"\ p
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} ?/|Xie
}else{ E/cV59
this.totalCount = 0; @=kgK[t
9
} ky2]%cw
} ?:r?K|Ku
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publicint[] getIndexes(){ u
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return indexes; L{/%
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} O Z
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publicvoid setIndexes(int[] indexes){ UJO3Yn
this.indexes = indexes; etX@z'H
} ,Zmjw@w
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publicint getStartIndex(){ TcZ.5Oe6h#
return startIndex; >pu4 G+M
} /3s&??{tv
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publicvoid setStartIndex(int startIndex){ xPZ>vCg
if(totalCount <= 0) {aAd (~YZ
this.startIndex = 0; 1ksFxpE
elseif(startIndex >= totalCount) UZ<K'H,q
this.startIndex = indexes
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[indexes.length - 1]; HH*y$
elseif(startIndex < 0) fd[N]I3
this.startIndex = 0; )tG. 9"<
else{ Q`F1t
this.startIndex = indexes k;\gYb%L
*)K\&h<{
[startIndex / pageSize]; 1L,L/sOwB&
} R-%6v2;ry
} $0$sM/ %
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publicint getNextIndex(){ um%_kX
int nextIndex = getStartIndex() + 5L3+KkX@
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pageSize; "Z&.m..gc
if(nextIndex >= totalCount) v,i|:;G
return getStartIndex(); 4jXo5SkEJ
else &
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return nextIndex; 40?RiwwD
} qyM/p.mP
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publicint getPreviousIndex(){ a&>NuMDI
int previousIndex = getStartIndex() - QIiy\E%
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pageSize; ROFZ*@CH<
if(previousIndex < 0) xhP~]akHN7
return0;
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else R;DU68R
return previousIndex; SfS3}Tn[
} |gE1P/%k
l cl|o3yQ
} hDxq9EF
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抽象业务类 jn^X{R\
java代码: %,bD|
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/** UDEGQ^)Xz|
* Created on 2005-7-12 t@!n?j
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*/ ?%5VaxWJ
package com.javaeye.common.business; ,D{7=mDVm
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import java.io.Serializable; ;M?)-dpZ
import java.util.List; ]FCP|Jz
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import org.hibernate.Criteria; nJe}U#
import org.hibernate.HibernateException; n^nE&'[?0g
import org.hibernate.Session; x3ZF6)@
import org.hibernate.criterion.DetachedCriteria; B@F@,?K4%
import org.hibernate.criterion.Projections; FJeh=\
import @jn&Wf?
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org.springframework.orm.hibernate3.HibernateCallback; BAQ-1kSz
import -PV1x1|
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org.springframework.orm.hibernate3.support.HibernateDaoS )9H5'Wh#
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upport; z>N[veX%
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import com.javaeye.common.util.PaginationSupport; CY o
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public abstract class AbstractManager extends (H_dZL
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HibernateDaoSupport { Z8E<^<|
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privateboolean cacheQueries = false; F
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privateString queryCacheRegion; -+ByK#<%
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publicvoid setCacheQueries(boolean {VAih-y
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cacheQueries){ @bg9
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this.cacheQueries = cacheQueries; e)uC
} Dck/Ea
aEN` `
publicvoid setQueryCacheRegion(String %O`@}Tg
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queryCacheRegion){ EL~$7 J
this.queryCacheRegion = IWE([<i}i[
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queryCacheRegion; `Na()r$T
} ( eKgc
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publicvoid save(finalObject entity){ LhO\a
getHibernateTemplate().save(entity); 8~(xi<"e
} ?TA7i b_
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publicvoid persist(finalObject entity){ 5t:Zp\$+`
getHibernateTemplate().save(entity); yX!fj\R
} == wX.y\.n
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publicvoid update(finalObject entity){ m4m-JD|v
getHibernateTemplate().update(entity); 58Ibje
} ?"@Fq2xgB4
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publicvoid delete(finalObject entity){ )=f}vHg$
getHibernateTemplate().delete(entity); O?OAXPK2
} jq
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publicObject load(finalClass entity, L62'Amml
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finalSerializable id){ +;W%v7%<
return getHibernateTemplate().load Gj?Zbl <
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(entity, id); R%.`h
} U =J5lo
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publicObject get(finalClass entity, ]+:yfDtZd
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finalSerializable id){ G`l\R:Q
return getHibernateTemplate().get Lip#uuuXXN
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(entity, id); Bj7*2}
} XH%pV
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publicList findAll(finalClass entity){ o(ow{S@=4
return getHibernateTemplate().find("from s*GZOz
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" + entity.getName()); ]~;*9`:
} P|Aac,nE+^
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publicList findByNamedQuery(finalString |!(8c>]Bo
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namedQuery){ [bnu
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return getHibernateTemplate \~#\ [r_
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().findByNamedQuery(namedQuery); b%lB&}uw}
} HwFg;r
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publicList findByNamedQuery(finalString query, PzPNvV/o
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finalObject parameter){ + nR("Il
return getHibernateTemplate Kyh6QA^
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().findByNamedQuery(query, parameter); \udB4O
} P8c_GEna
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publicList findByNamedQuery(finalString query, 0'd@8]|H
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finalObject[] parameters){ SAnr|<Y/
return getHibernateTemplate 3X(^`lAf)
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().findByNamedQuery(query, parameters); a>GA=r
} 3.YH7rN
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publicList find(finalString query){ DG;u_6;JR
return getHibernateTemplate().find :kHk'.V1(
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(query); #)S }z+I
} b]]k\b
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publicList find(finalString query, finalObject a >fA-@
# m|el@)
parameter){ I0Do%
return getHibernateTemplate().find d*+}_EV)Y3
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(query, parameter); 9-n]_AF`0
} HZ<#H3_ix
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public PaginationSupport findPageByCriteria _A]jiPq
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(final DetachedCriteria detachedCriteria){ wp:$Tq a$
return findPageByCriteria s-*N_Dv
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); tgBA(2/Co
} ;7Qe m&
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public PaginationSupport findPageByCriteria ^I/(9KP#
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(final DetachedCriteria detachedCriteria, finalint jEKa9rt
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startIndex){ <;i&-,
return findPageByCriteria ~oOv/1v},
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(detachedCriteria, PaginationSupport.PAGESIZE, (a!E3y5,
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startIndex); j 1'H|4
} NHZMH!=4:n
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public PaginationSupport findPageByCriteria z*nztvY@e
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(final DetachedCriteria detachedCriteria, finalint ~(m6dPm$}m
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pageSize, sUF5Yq:9
finalint startIndex){ VII`qbxT
return(PaginationSupport) y%--/;
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getHibernateTemplate().execute(new HibernateCallback(){ Nt+UL/1]
publicObject doInHibernate R7Tl1!,h
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(Session session)throws HibernateException { LzXIqj'H7T
Criteria criteria = N0fE*xo
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detachedCriteria.getExecutableCriteria(session); ,,XHw;{
int totalCount = w;VUP@Wm
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((Integer) criteria.setProjection(Projections.rowCount ~l+~MB
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()).uniqueResult()).intValue(); qyyLU@hd
criteria.setProjection i_6 wD
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(null); (`n*d3
List items = tSDp>0yZ3
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criteria.setFirstResult(startIndex).setMaxResults -NG9?sI\U
=L$RY2S"
(pageSize).list(); ^(xVjsHp#
PaginationSupport ps = 7.5\LTM>9e
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new PaginationSupport(items, totalCount, pageSize, j@Us7Q)A(
nkk GJV!
startIndex); suj}A
return ps; jaThS!>v
} t[%=[pJHW
}, true); QL(}k)dB
} `).;W
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public List findAllByCriteria(final lSId<v?C>
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DetachedCriteria detachedCriteria){ '.&,.E&{$
return(List) getHibernateTemplate y(#F&^|
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().execute(new HibernateCallback(){ GLl@
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publicObject doInHibernate 7f=9(Zj
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(Session session)throws HibernateException { \No22Je6d
Criteria criteria = a7NX~9g
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detachedCriteria.getExecutableCriteria(session); Q!%CU8!`&
return criteria.list(); I(WND/&
} 8&f"")m
}, true); `|JQ)!Agx
} OaxE3bDT
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public int getCountByCriteria(final CtDS lJ
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DetachedCriteria detachedCriteria){ dR/UXzrc
Integer count = (Integer) sXC]{]
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getHibernateTemplate().execute(new HibernateCallback(){ ;lWy?53=@
publicObject doInHibernate [dL?N
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(Session session)throws HibernateException { nBiA=+'v
Criteria criteria = s.dn~|a
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detachedCriteria.getExecutableCriteria(session); a( {`<F
return &<i>)Ss
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criteria.setProjection(Projections.rowCount f<'&_*7,|t
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()).uniqueResult(); 4_I,wG@
} &(^>}&XS.<
}, true); "Lpt@g[HF
return count.intValue(); ZCJ8I
} v:T` D
} 8UL:C?eY
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用户在web层构造查询条件detachedCriteria,和可选的 " Gn; Q-@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 s*#|EdD6@
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PaginationSupport的实例ps。 !`#9#T|
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ps.getItems()得到已分页好的结果集 qP<,"9!I
ps.getIndexes()得到分页索引的数组 \M532_w
ps.getTotalCount()得到总结果数 }w]xC
ps.getStartIndex()当前分页索引 +`Bn]e8O
ps.getNextIndex()下一页索引 n_ez6{
ps.getPreviousIndex()上一页索引 GRV9s9^
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 QBn>@jq
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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 Tk2kis(n
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一下代码重构了。 Zz&i0r
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我把原本我的做法也提供出来供大家讨论吧:
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首先,为了实现分页查询,我封装了一个Page类: 9FLn7Y
java代码: gX _BJ6
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/*Created on 2005-4-14*/ @>:07]Dxo
package org.flyware.util.page; imhq*f#A[
l?1!h2z%
/** /[IQ:':^
* @author Joa l{a&Zy)
* ipp_?5TL
*/ KE3
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publicclass Page { yl ;'Ru:
,"VQ0Z1
/** imply if the page has previous page */ q
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privateboolean hasPrePage; 0amz#VIB<u
@YB\PVhW
/** imply if the page has next page */ 9cmJD5OO
privateboolean hasNextPage; +?:V\niQI
\
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/** the number of every page */ PC_4#6^5
privateint everyPage; &"h!SkX/
,<
icW&a
/** the total page number */ uWInx6p
privateint totalPage; rpT<cCem1
N]<gHGj}
/** the number of current page */ XfrnM^oty
privateint currentPage; _dBU6U:V
h*9o_
/** the begin index of the records by the current _z 5CplO
C|zH {.H
query */ wf@2&vJ
privateint beginIndex; %Nn'p"
!m|%4/
M@
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/** The default constructor */ WO9/rF_
public Page(){ M<srJ8|'
w1_Ux<RF
} K)@}Ok"#\4
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/** construct the page by everyPage j1kc&(
* @param everyPage `x VA]GR4c
* */ zNf5OItx
public Page(int everyPage){ UIj/Id
this.everyPage = everyPage; dZgfls
} NLGr=*dq
^e,RM_.
/** The whole constructor */ i?/?{p$#a-
public Page(boolean hasPrePage, boolean hasNextPage, `7_LJ
\>I
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int everyPage, int totalPage, vrv*k
int currentPage, int beginIndex){ swFOh5z
this.hasPrePage = hasPrePage; -JENY|6
this.hasNextPage = hasNextPage; @ 1A_eF
this.everyPage = everyPage; #+PbcL
this.totalPage = totalPage; o{LFXNcg[
this.currentPage = currentPage; `C?OAR44
this.beginIndex = beginIndex; 1W[(+TZ&s
} Q9>]@DrAx
3@?YTez#
/** ~Wm}M
* @return 5,ahKB8
* Returns the beginIndex. l7!)#^`2_
*/ 6{X>9hD
publicint getBeginIndex(){ .A/H+.H;
return beginIndex; Rk[ * p
} ItPK
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/** *KH@u
* @param beginIndex 8|NJ(D-$
* The beginIndex to set. "%t`I)
*/ r_E)HL/A
publicvoid setBeginIndex(int beginIndex){ U.'@S8
this.beginIndex = beginIndex; n;`L5
} 3]es$ Jy
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/** x 4</\o
* @return F5MPy[
* Returns the currentPage. 34kd|!e,
*/ [B @j@&
publicint getCurrentPage(){ ug"<\"
return currentPage; H;|:r[d!
} |uBC0f
a&"*UJk<?
/** H`lD@q'S
* @param currentPage "@w%TcA
* The currentPage to set. E}9ldM=]s
*/ rI+w1';C1
publicvoid setCurrentPage(int currentPage){ zxUj1
this.currentPage = currentPage; =>\-ma+
} /+`<X%^U
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/** 8G] m7Z
* @return GTe:k
* Returns the everyPage. eI rmD
*/ yWi0tE{
publicint getEveryPage(){ :qTcxzV
return everyPage; (<ZkmIXN
} 1DtMY|wP
ko2j|*D6@~
/** ]=VS~azZ5
* @param everyPage ?}v% JUcs
* The everyPage to set. >TnQ4^;v.
*/ |;m`874
publicvoid setEveryPage(int everyPage){ l)*,18n
this.everyPage = everyPage; cievC,3*
} CN~NyJL H
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/** 65#:2,s
* @return ?VP!1O=J
* Returns the hasNextPage. /
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*/ \R\@t]>Y
publicboolean getHasNextPage(){ L2.`1Aag
return hasNextPage; .`>l.gmi&
} q,+kPhHEgy
t`YZ)>Ws
/** E+ 3yN\X(
* @param hasNextPage Df:7P>
* The hasNextPage to set. A
a} o*
*/ uoY`qF.`
publicvoid setHasNextPage(boolean hasNextPage){ _pko]F|()
this.hasNextPage = hasNextPage; {hRie+
} ,,gLrVk
#t2UPLO~
/** ]ZzG!7
* @return q6JW@GT
* Returns the hasPrePage. Xu94v{u3
*/ DwY<qNWT
publicboolean getHasPrePage(){ ,o@~OTja*
return hasPrePage; 27E9NO=
} ,' rL'Ys
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/** /E{dM2
* @param hasPrePage 4[,B ;7
* The hasPrePage to set. }#HTO:r
*/ +}1hU
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publicvoid setHasPrePage(boolean hasPrePage){
gr`Ar;
this.hasPrePage = hasPrePage; [}ZPg3Y
} G</I%qM
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/**
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* @return Returns the totalPage. (21 W6
* tdnXPxn[
*/ 2iPmCG
publicint getTotalPage(){ yOUX E>-
return totalPage; (ND5CKCR^
} e4=FU&RpNH
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/** {#1j"
* @param totalPage 2'<=H76
* The totalPage to set. De
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*/ Awa|rIM
publicvoid setTotalPage(int totalPage){ |v$%V#Bo
this.totalPage = totalPage; \YlF>{LVe
} -M:hlwha
q]N?@l]
} }>;ht5/i/
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 Y0PGT5].@'
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个PageUtil,负责对Page对象进行构造: OS"{"P
java代码: ^s2m\Q(
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/*Created on 2005-4-14*/ X$- boe?
package org.flyware.util.page; %]chL.s
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import org.apache.commons.logging.Log; Cv>yAt.3
import org.apache.commons.logging.LogFactory; 3_L1Wm
xz"Z3B
/** ke}Y2sB
* @author Joa ,ykPQzO
* WO.0K5nfk
*/ b$v[@"1
publicclass PageUtil { ntj`+7mw
=|E
09
privatestaticfinal Log logger = LogFactory.getLog \m=-8KpU
A \MfF
(PageUtil.class); ` /I bWu
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/** a1g6}ym\
* Use the origin page to create a new page VelB-vy&
* @param page jcEs10y
* @param totalRecords f`hyYp`d5
* @return egI{!bZg'\
*/ ,pyQP^u-
publicstatic Page createPage(Page page, int QGH
h;
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totalRecords){ 3tT|9Tb@
return createPage(page.getEveryPage(), ` URSv,(
8"km_[JE e
page.getCurrentPage(), totalRecords); c$Xe.:QY
} "[jhaUAK
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/** _/,SZ-C#L4
* the basic page utils not including exception a[1sA12
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handler N>d|A]zH
* @param everyPage ,4H;P/xsb
* @param currentPage i1qS ns
* @param totalRecords Jo{zy
* @return page mb0n}I_AC
*/ Ky[bX
publicstatic Page createPage(int everyPage, int kqVg2#<@M
8^/+wa+G
currentPage, int totalRecords){ cT-K@dg
everyPage = getEveryPage(everyPage); 3yTQ
currentPage = getCurrentPage(currentPage); @72x`&|I?u
int beginIndex = getBeginIndex(everyPage, !}>eo2$r^
F2IC$:e
M
currentPage); 9?uqQ
int totalPage = getTotalPage(everyPage, :O9P(X*
Mn]}s:v
totalRecords); G*i.a*9<)
boolean hasNextPage = hasNextPage(currentPage, ?SC3Vzr
2X|CuL{]
totalPage); m_Mwg
boolean hasPrePage = hasPrePage(currentPage); Z0e-W:&;kF
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returnnew Page(hasPrePage, hasNextPage, 2BHKS-J*
everyPage, totalPage, W1xf2=z`)T
currentPage, 2Sge
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beginIndex); R{*_1cyW
} p{NPcT%&
^DBD63N"
privatestaticint getEveryPage(int everyPage){ ( "_Q
return everyPage == 0 ? 10 : everyPage; !xkj30O(G
} EVR! @6@
r2RBrZ@1
privatestaticint getCurrentPage(int currentPage){ &&;ex9
return currentPage == 0 ? 1 : currentPage; P?^JPbfV
} mT96]V\
eh$G.-2N
privatestaticint getBeginIndex(int everyPage, int B ,V(LTE
+.w[6
currentPage){ @. "q
return(currentPage - 1) * everyPage; gf+o1\5t@
} X(IyvfC
xb%/sz(4
privatestaticint getTotalPage(int everyPage, int Ay2b,q
uu}'i\Q
totalRecords){ 8{oZi]ob
int totalPage = 0; vx'l>@]k
#`/bQ~s
if(totalRecords % everyPage == 0) sNL+F
totalPage = totalRecords / everyPage; 4 GUA&