Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 aC' 6
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 l#C<bDw
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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 @Oz3A<M
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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 =?4[:#Rh
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。 }s?w-u+(c6
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分页支持类: a{e
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java代码: Muq~p~m}
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package com.javaeye.common.util; :I/9j=@1
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import java.util.List; J*K=tA
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publicclass PaginationSupport { lmUCrs37
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publicfinalstaticint PAGESIZE = 30; 4`o0?_.'
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privateint pageSize = PAGESIZE; IDpLf*vSG
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privateList items; )(.g~Q:
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privateint totalCount; 0iC5,
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privateint[] indexes = newint[0]; -#;ZZ\fdj
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privateint startIndex = 0; BE&8E\w
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public PaginationSupport(List items, int HD{u#~8{
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totalCount){ IDF0nx]
setPageSize(PAGESIZE); E0HE@pqr
setTotalCount(totalCount); LZG(T$dI
setItems(items); !s$1C=z5u
setStartIndex(0); b^<7a&
} r91i :
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public PaginationSupport(List items, int CD#U`jf
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totalCount, int startIndex){ #D(=[F
setPageSize(PAGESIZE); |;aZi?Ek[
setTotalCount(totalCount); "ivVIq2
setItems(items); jp}.W
setStartIndex(startIndex); ldU ><xc2
} ZvXw#0)v
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public PaginationSupport(List items, int OhaoLmA}6
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totalCount, int pageSize, int startIndex){ k[ pk R{e
setPageSize(pageSize); q~iEw#0-L
setTotalCount(totalCount); `tT7&*Os
setItems(items); l{?9R.L
setStartIndex(startIndex); |'o<w
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} 2YQBw,gG
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publicList getItems(){ T^+K`U
return items; >e.vUUQ{
} yXtQfR
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publicvoid setItems(List items){ 2|1CGHj\
this.items = items; `B8`<3k/(
} <jFov`^
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publicint getPageSize(){ e{4e<hd
return pageSize; afaQb
} UWqX}T[^
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publicvoid setPageSize(int pageSize){ MYxuQ |w
this.pageSize = pageSize; DuAix)#FN9
} Y>E` 7n
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publicint getTotalCount(){ ^I6Vz?0Jl
return totalCount; c9nv=?/}f
} )FA:wsy~E
FW3E UC)P
publicvoid setTotalCount(int totalCount){ m4~~ q[t
if(totalCount > 0){ R;U4a2~
this.totalCount = totalCount; 2Z"\%ZD
int count = totalCount / F!?f|z,/
N48X[Q*
pageSize; ox.kL
if(totalCount % pageSize > 0) MR@Qn[RdM
count++; 0[uOKFgE
indexes = newint[count]; 9&kPcFX B
for(int i = 0; i < count; i++){ ^* y1Fn0
indexes = pageSize * 48;b
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i; RMs8aZCa
} KdTWi;mV2-
}else{ NYxL7 :9
this.totalCount = 0; wLfH/J
} *[jq&
} nD
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publicint[] getIndexes(){ DV({! [EP
return indexes; `4Z:qh+fJ
} 7;6'=0(
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publicvoid setIndexes(int[] indexes){ sQrM"i0Y>
this.indexes = indexes; PF)s>
} 4`V&Yqwl
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publicint getStartIndex(){ BG4TUt
return startIndex; l\m7~
} YiL^KK
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publicvoid setStartIndex(int startIndex){ D~Q-:G$x
if(totalCount <= 0) j@UE#I|h
this.startIndex = 0; Hy'EbQ
elseif(startIndex >= totalCount) w:1UwgcPC
this.startIndex = indexes JnQ@uZb`
, a2=OV
[indexes.length - 1]; "N,@J-]/k
elseif(startIndex < 0) Gt,VSpb~s
this.startIndex = 0; o=lZl_5/u;
else{ v}!^RW'X
this.startIndex = indexes = 'e_9b\K
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[startIndex / pageSize]; k0b6X5
} /;y`6WG%2
} NOAz"m+o
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publicint getNextIndex(){ S,Qa\\~z
int nextIndex = getStartIndex() + qsQTJlq)
][ 8`}ki 1
pageSize; p gv, Su
if(nextIndex >= totalCount) cxPO O#
return getStartIndex(); mgq4g
else egWfKL&iy
return nextIndex; Kb/qM}jS
} $(yi+v
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publicint getPreviousIndex(){ @!!5el {
int previousIndex = getStartIndex() - Smh=Q4,W
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pageSize; `lbRy($L
if(previousIndex < 0) %w!x \U V
return0; G8Ow;:Ro
else ':=20V
return previousIndex; m.5@qmQ
} eG dFupfz
).tTDZ
} h>z5m
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抽象业务类 ,a0RI<D
java代码: fQw=z$
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/** @c>MROlrlF
* Created on 2005-7-12 .\
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*/ K'K/}q<
package com.javaeye.common.business; LF:~&
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import java.io.Serializable; 6jov8GIAt
import java.util.List; +mO/9m
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import org.hibernate.Criteria; 4jVd
import org.hibernate.HibernateException; 3]&le[.
import org.hibernate.Session; `0W+(9}
import org.hibernate.criterion.DetachedCriteria; $9G".T
import org.hibernate.criterion.Projections; d]?fL&jr
import 0yb9R/3.
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org.springframework.orm.hibernate3.HibernateCallback; --vJR/-
import +5:9?&lH
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org.springframework.orm.hibernate3.support.HibernateDaoS ')WS :\J
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upport; T-js*
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import com.javaeye.common.util.PaginationSupport; u3jLe=Y'\
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public abstract class AbstractManager extends btDTC9O
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HibernateDaoSupport { O? 7hT!{
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privateboolean cacheQueries = false; mF>{cVTF
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privateString queryCacheRegion; !Okl3
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publicvoid setCacheQueries(boolean M'NOM>8
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cacheQueries){ P (fWJVF7
this.cacheQueries = cacheQueries; j}G9+GX~,
} "DecS:\
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publicvoid setQueryCacheRegion(String h~=~csya:
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queryCacheRegion){ {J;(K~>?m
this.queryCacheRegion = F]RZP/D`
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queryCacheRegion; s}4k^NGFJ
} $o
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publicvoid save(finalObject entity){ dZCjg0cx
getHibernateTemplate().save(entity); iW[%|ddk
} _6aI>b#yL
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publicvoid persist(finalObject entity){ b>& 3XDz
getHibernateTemplate().save(entity); /~/nhKm
} 6""i<oR
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publicvoid update(finalObject entity){ }e>OmfxDBt
getHibernateTemplate().update(entity); uJ3*AO
} %)o;2&aD
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publicvoid delete(finalObject entity){ Ed#Hilk'
getHibernateTemplate().delete(entity); VF~kjH2>
} N1l^%Yf J
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publicObject load(finalClass entity, %(r.`I$
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finalSerializable id){ A%EGu4
return getHibernateTemplate().load ;a(7%
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(entity, id); `pd+as
} J
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publicObject get(finalClass entity, bZgFea_>i
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finalSerializable id){ 80LN(0?x
return getHibernateTemplate().get 2KNs,4X@
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(entity, id); j__l'?s
} lQVK~8t3
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publicList findAll(finalClass entity){ h-%RSei5
return getHibernateTemplate().find("from X$SXDb~G
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" + entity.getName()); y# IUDnRJ
} CmtDfE
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publicList findByNamedQuery(finalString z2;<i|Ez0
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namedQuery){ ]ia{N
return getHibernateTemplate io7Zv*&T0
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().findByNamedQuery(namedQuery); YcM0A~<
} m3`J9f,c/
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publicList findByNamedQuery(finalString query, + ;B K|([#
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finalObject parameter){ w#>CYP`0k6
return getHibernateTemplate OB+QVYk"
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().findByNamedQuery(query, parameter); .R&jRtb/E
} n-CFB:L
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publicList findByNamedQuery(finalString query, cXt]55"
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finalObject[] parameters){
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return getHibernateTemplate &[[Hfs2:-]
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().findByNamedQuery(query, parameters); GOX2'N\h^
} fczH^+mI
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publicList find(finalString query){ e @|uG %
return getHibernateTemplate().find L ?S#3@Pa
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(query); S8;5|ya
} ?b?YiK&yz
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publicList find(finalString query, finalObject SB^xq
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parameter){
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return getHibernateTemplate().find <a&$D
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(query, parameter); WCg&*
} Y".4."NX
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public PaginationSupport findPageByCriteria Tuy5h5
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(final DetachedCriteria detachedCriteria){ y2>AbrJ
return findPageByCriteria R(#ZaFuo[
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); +\25ynM
} {0\9HI@
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public PaginationSupport findPageByCriteria 1-8G2e
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(final DetachedCriteria detachedCriteria, finalint yzyK$WN\[3
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startIndex){ b4>1UZGW-
return findPageByCriteria WI-I+0sE
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(detachedCriteria, PaginationSupport.PAGESIZE, m 8P`n
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startIndex); :E2 ww`
} 2@|,VN V6~
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public PaginationSupport findPageByCriteria ?GeMD
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(final DetachedCriteria detachedCriteria, finalint F;Bq[V)R
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pageSize, i:
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finalint startIndex){ IkgRZ{Y
return(PaginationSupport) `4a9<bG
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getHibernateTemplate().execute(new HibernateCallback(){ dg@'5.ApPu
publicObject doInHibernate Ypx"<CKP}
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(Session session)throws HibernateException { *+j r? |
Criteria criteria = MD[;Ha
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detachedCriteria.getExecutableCriteria(session); >ui;B$=
int totalCount = 4ms"mIt
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((Integer) criteria.setProjection(Projections.rowCount {z |+.D
(E7C9U*
()).uniqueResult()).intValue(); .hK:-q,
criteria.setProjection |}wT/3>\
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(null); jXYjs8Iy
List items = M^.>UZKyl
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criteria.setFirstResult(startIndex).setMaxResults ?I;PJj
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JS(>
(pageSize).list(); wfQImCZ>l
PaginationSupport ps = P$&l1Mp
}hS$F
new PaginationSupport(items, totalCount, pageSize, O+ xzM[[
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startIndex); yMJ(Sf
return ps; =!DpW VsQ
} -BEd7@?A
}, true); yhd]s0(!
} W@Rb"5Gy+
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public List findAllByCriteria(final ricL.[v9S
) RNB;K~s9
DetachedCriteria detachedCriteria){ ma@!"Z8S
return(List) getHibernateTemplate JHg
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().execute(new HibernateCallback(){ Sgn<=8,6c
publicObject doInHibernate 0t6DD
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(Session session)throws HibernateException { =!IoL7x
Criteria criteria = _a zJ>
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detachedCriteria.getExecutableCriteria(session); oH(=T/{
return criteria.list(); P
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} ^n*:zmD
}, true); c uHF^l
} $aHHXd}@t2
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public int getCountByCriteria(final UD ;UdehC
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DetachedCriteria detachedCriteria){ %#E$wz
Integer count = (Integer) gB]jLe
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getHibernateTemplate().execute(new HibernateCallback(){ u]&+TR
publicObject doInHibernate ;3+_aoY
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(Session session)throws HibernateException { gpogv
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Criteria criteria = c"/Hv
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detachedCriteria.getExecutableCriteria(session); mEyIbMci
return =Jswd
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criteria.setProjection(Projections.rowCount mnFmShu
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()).uniqueResult(); &!B4v<#, U
} 5.
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}, true); +-qa7
return count.intValue(); nxe9^h7m
} C@u}tH
)
} Op:$7hv
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用户在web层构造查询条件detachedCriteria,和可选的 B(Er/\-@U
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 C=JS]2W2
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PaginationSupport的实例ps。 ^7YZ>^
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ps.getItems()得到已分页好的结果集 */4hFD {
ps.getIndexes()得到分页索引的数组 <TgVU.*
ps.getTotalCount()得到总结果数 k\IdKiOj!D
ps.getStartIndex()当前分页索引 9*VL |
ps.getNextIndex()下一页索引 /q)
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ps.getPreviousIndex()上一页索引 ZP
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 IUz`\BO4
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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 HQMug
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一下代码重构了。 o $'K}U
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我把原本我的做法也提供出来供大家讨论吧: ?RS4oJz,5g
_}.WRFIJ@L
首先,为了实现分页查询,我封装了一个Page类: p5l|qs
java代码: C$4{'J-ZH
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/*Created on 2005-4-14*/ gZ8JfA_\R(
package org.flyware.util.page; . Ctd$
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/** |-z"6F r-
* @author Joa 1'|gxYT
* NdrR+t^#
*/ yQf(/Uxk*x
publicclass Page { Adgfo)X5
^DVryeLD
/** imply if the page has previous page */ e$E>6Ngsr
privateboolean hasPrePage; jwSPLq%
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/** imply if the page has next page */ D;[%*q*
privateboolean hasNextPage; plpb4>
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/** the number of every page */ Y(gai?
privateint everyPage; |XV`A)=f
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/** the total page number */ stiYC#b I:
privateint totalPage; AuZISb%6
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/** the number of current page */ p3e=~{v*
privateint currentPage; wCu!dxT|,
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/** the begin index of the records by the current PsOq-
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query */ 4BeHj~~
privateint beginIndex; k{U[ U1j
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/** The default constructor */ PcjeuJZ
public Page(){ 9 9^7Ek!z#
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} 204"\mv
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/** construct the page by everyPage u=Xpu,q
* @param everyPage P"o|kRO
* */ A5Q4wy`
public Page(int everyPage){ x,|fblQz
this.everyPage = everyPage; 6OqF-nso[E
} umCmxmr&
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/** The whole constructor */ _9q byhS7
public Page(boolean hasPrePage, boolean hasNextPage, uh%
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{ft |*
int everyPage, int totalPage, | GN/{KH]
int currentPage, int beginIndex){ 'p@m`)Z
this.hasPrePage = hasPrePage; )0g!lCfb
this.hasNextPage = hasNextPage; `gyke2n
this.everyPage = everyPage; + R~!G
this.totalPage = totalPage; y=Z[_L!xr
this.currentPage = currentPage; &WOm[]Q4
this.beginIndex = beginIndex; +\?+cXSc
} mq(-L
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/** L
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* @return W8r"dK
* Returns the beginIndex. bZ^'_OOn
*/ Rt5pl,Nf
publicint getBeginIndex(){ v6Wz:|G/u
return beginIndex; 'K01"`#
} Z#D*HAd`
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/** h<8c{RuoZC
* @param beginIndex f1sp6S0V\
* The beginIndex to set. $4qM\3x0,
*/ reM~q-M~o@
publicvoid setBeginIndex(int beginIndex){ OR37
this.beginIndex = beginIndex; J:O&2g"g
} DLD9
{Ppb ;
/** 7U^{xDg.b
* @return N(3Bzd)
* Returns the currentPage. !6a;/ys
*/ m(D-?mhL
publicint getCurrentPage(){ sH'0utD#Y
return currentPage; IiJ$Ng
} t=|}?lN<
gZBKe!@a|
/** ]7oo`KcQ|
* @param currentPage ?GqH/
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* The currentPage to set. $yq76
*/ .}T- R?
publicvoid setCurrentPage(int currentPage){ #_UP}G$
this.currentPage = currentPage; *ae)<l3v
} 6q!Q([D_
o6:bmKWE
/** ] SLeWs
* @return AEDBr <
* Returns the everyPage. 6y57m;JW/
*/ (ti!Y"e2
publicint getEveryPage(){ o*2Mjd]r
return everyPage; 9U4[o<G]=
} Z9q4W:jyS
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/** S%B56|'
* @param everyPage Ye$;
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* The everyPage to set. 7G*rxn"d
*/ j}`ku9S~
publicvoid setEveryPage(int everyPage){ E1dhj3+3
this.everyPage = everyPage; >AY9F|:
}
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/** !ZvVj\{
* @return %d40us8 E
* Returns the hasNextPage. ^f-)gZ&
*/ vK+!m~kDu
publicboolean getHasNextPage(){ QDVSFGwr
return hasNextPage; X.FoX
} ~4O3~Y_+GN
hl] y):
/** e@S$[,8
* @param hasNextPage Sw$/Z)1K&
* The hasNextPage to set. Nl/
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*/ H q?F @X
publicvoid setHasNextPage(boolean hasNextPage){ ?L H[,8z
this.hasNextPage = hasNextPage;
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} 9_.pLLx
@F*z/E}e
/** 3orL;(.G
* @return 5|>ms)[RQ
* Returns the hasPrePage. i)$+#N
*/ eibkG
publicboolean getHasPrePage(){ 0>D*d'xLd
return hasPrePage; F9d6#~
} m-+>h:1b|9
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/** q?)5yukeF
* @param hasPrePage TU6YS<
* The hasPrePage to set. J><hrZ
*/ x]?V*Jz
publicvoid setHasPrePage(boolean hasPrePage){ <eP,/H
this.hasPrePage = hasPrePage; Uovna:"
} qm'@o -[
9}Za_ZgG
/** @g]+$Yj
* @return Returns the totalPage. \2#K {
* Pn4jI(
*/ Z_<NUPE
publicint getTotalPage(){ +2}Ar<elP
return totalPage; R>1oF]w
} `ZO5-E
.6y*Z+Zg
/** KK]R@{ r
* @param totalPage -nX{&Z3-s
* The totalPage to set. Pth4_]US
*/ x1STjI>i
publicvoid setTotalPage(int totalPage){ $}5M`p\&C
this.totalPage = totalPage; Z=;=9<vA
} e%4vvPp
{f*{dSm9b
} |2=w":2#
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+
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 TDy)A2Z
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个PageUtil,负责对Page对象进行构造: gp~-n7'~O
java代码: O U9{Y9e
r2PN[cLu|
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/*Created on 2005-4-14*/ -*Qg^1]i+
package org.flyware.util.page; 1=E}X5
,?Vxcr
import org.apache.commons.logging.Log; +u t%C.1
import org.apache.commons.logging.LogFactory; pU,\ &3N
!=yO72dgLY
/** T nyLVIP
* @author Joa dVGcth;
* Z=%u:K}[
*/ '%:E4oI
publicclass PageUtil { 1rU\ !GfR
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privatestaticfinal Log logger = LogFactory.getLog S$R=!3* "V
eb,QT\/G
(PageUtil.class); eI|~neh
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/** MrOtsX
* Use the origin page to create a new page ^L
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* @param page D62'bFB^
* @param totalRecords N"Y%*BkH
* @return 6& hiW]Adm
*/ ;ByCtVm2
publicstatic Page createPage(Page page, int #q9BU:
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totalRecords){ Do^yer~
return createPage(page.getEveryPage(), -xJ\/"A
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page.getCurrentPage(), totalRecords); }v?l0Gk(
} %?qzP'
IF//bgk-
/** -GQ.B{%G
* the basic page utils not including exception T2mZkK?rA
NcX-*o
handler ,'l.u?SKyd
* @param everyPage (4`Tf*5hHa
* @param currentPage I/v#!`L
* @param totalRecords -(}N-yu
* @return page W&Xi&[Ux
*/ 5"q{b1
publicstatic Page createPage(int everyPage, int KpS=oFX{}
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currentPage, int totalRecords){ akHQ&+[j
everyPage = getEveryPage(everyPage); |L-- j
currentPage = getCurrentPage(currentPage); I>-}ys`[
int beginIndex = getBeginIndex(everyPage, *]k E3
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currentPage); [`KQ\4u
int totalPage = getTotalPage(everyPage, tEibxE
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totalRecords); n
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