Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ~|S0E:*.
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 5GScqY,aB
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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 b)'CP Cu*
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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 WlQCP C
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分页支持类: 6 :|;O
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java代码: '(B -{}l
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package com.javaeye.common.util; +^(_S9CO
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import java.util.List; P
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publicclass PaginationSupport { rZdOU?U
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publicfinalstaticint PAGESIZE = 30; 8WQ#)
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privateint pageSize = PAGESIZE; mM&P&mz/D
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privateList items; 6vbKKn`ST
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privateint totalCount; ~{lb`M^]h
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privateint[] indexes = newint[0]; |OCiq|#
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privateint startIndex = 0; {7m2vv? Z
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public PaginationSupport(List items, int b
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totalCount){ HL"c yxe
setPageSize(PAGESIZE); !Q|a R
setTotalCount(totalCount); G3TS?u8Q
setItems(items); 3?V'O6
setStartIndex(0); G@ot^n3
} trrNu
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public PaginationSupport(List items, int -y!Dg6A
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totalCount, int startIndex){ Cydo~/
setPageSize(PAGESIZE); :Y /aT[
setTotalCount(totalCount); 3>VL>;75[
setItems(items); udUc&pX
setStartIndex(startIndex); El9T>!Z
} 5r
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public PaginationSupport(List items, int nD/B:0'
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totalCount, int pageSize, int startIndex){ TM6wjHFm
setPageSize(pageSize); /~'C!so[v
setTotalCount(totalCount); Wo&22,EB
setItems(items); +I5\`By=
setStartIndex(startIndex); uxL+oP0
} QDY uJ&!h
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publicList getItems(){ 7WmLC
return items; fpQFNV
} wT!?.Y)aj
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publicvoid setItems(List items){ E va&/o?P|
this.items = items; aB~k8]q.
} tZ62T{, a
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publicint getPageSize(){ 0o$RvxJ
return pageSize; %%X/gvaJ
} i5le0lM
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publicvoid setPageSize(int pageSize){ C0w_pu
this.pageSize = pageSize; mr}o0@5av
} =:g\I6'a
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publicint getTotalCount(){ *c4OhMU(
return totalCount; p9i7<X2&
} no-";{c
hb*Y-$Zp
publicvoid setTotalCount(int totalCount){ Cu%BU}(
if(totalCount > 0){ gKTCfD~
this.totalCount = totalCount; *bpN!2
int count = totalCount / E7h@Y~bNhW
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pageSize; cG0)F%?X?
if(totalCount % pageSize > 0) ^NU_Tp:2^
count++; PtuRXx
indexes = newint[count]; 31^/9lb
for(int i = 0; i < count; i++){ 90+Vw`Gz=
indexes = pageSize * +arh/pd_I
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i; YkF LNCg4}
} +?6]Vu&|f
}else{ dY$nw
this.totalCount = 0; /xgC`]-
} )2" g)9!
} :1f,%Z$,q
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publicint[] getIndexes(){ ~ a2A"#f
return indexes; nWCJY:q;5
} %9zpPrWF
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publicvoid setIndexes(int[] indexes){ >,zU=I?9Y
this.indexes = indexes; $Xo_8SX,
} k2->Z);X
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publicint getStartIndex(){ ,DHH5sDCn
return startIndex; (&*Bl\YoX
} zhow\l2t}
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publicvoid setStartIndex(int startIndex){ ]GRVU
if(totalCount <= 0) @)Vb?|3
this.startIndex = 0; .&]3wB~
elseif(startIndex >= totalCount) 2va[= >_
this.startIndex = indexes p?Ux1S
qYe`</
[indexes.length - 1]; L=#B>Eu
elseif(startIndex < 0) s'tXb=!HO
this.startIndex = 0; \``w>Xy8
else{ F',1R"/}
this.startIndex = indexes z I9jxwXU
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[startIndex / pageSize]; 2vUcSKG7
} D3g5#.$,}>
} G@D8[
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publicint getNextIndex(){ -+qg
int nextIndex = getStartIndex() + BuM#&]s
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pageSize; FDiDHOR
if(nextIndex >= totalCount) \0}bOHqEH
return getStartIndex(); 5<GeAW8ns]
else O
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return nextIndex; BHz_1+d
} <au_ S\n
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publicint getPreviousIndex(){ c9uu4%KG6<
int previousIndex = getStartIndex() - xK[[b
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pageSize; 3k_\xQ
if(previousIndex < 0) ffB<qf)?G
return0; 1F0];{a
else 56c3tgVF
return previousIndex; Pj56,qd>s
} D)L~vA/8b
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} XH0Vs.w
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抽象业务类 'YN:cr,V
java代码: n~>b}DY
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/** -{?xl*D
* Created on 2005-7-12 B2BG*xa
*/ kSge4?&
package com.javaeye.common.business; F-~Xbz%
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import java.io.Serializable; gi:M=
import java.util.List; 5B1,,8P
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import org.hibernate.Criteria; rmX5-k
import org.hibernate.HibernateException; FbdC3G|oA
import org.hibernate.Session; 4,)QV_?
import org.hibernate.criterion.DetachedCriteria; (ux9"r^g;x
import org.hibernate.criterion.Projections; ga1b%5]v.
import fe6Op
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org.springframework.orm.hibernate3.HibernateCallback; |Cfo(]>G
import |j8#n`'
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org.springframework.orm.hibernate3.support.HibernateDaoS [;toumv
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upport; "AWk
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import com.javaeye.common.util.PaginationSupport; Iw$T'I+4W
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public abstract class AbstractManager extends )=N.z6?
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HibernateDaoSupport { =AHV{V~
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privateboolean cacheQueries = false; +~
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privateString queryCacheRegion; u0uz~ s
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publicvoid setCacheQueries(boolean Y8mv[+Z
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cacheQueries){ ZkMHy1
this.cacheQueries = cacheQueries; Np~qtR
} -42 U
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publicvoid setQueryCacheRegion(String 4uVyf^f\]f
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queryCacheRegion){ M9yqJPS}B
this.queryCacheRegion = 1-! |_<EW1
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queryCacheRegion; `AdHyE
} d7kv
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publicvoid save(finalObject entity){ Y k"yup@3
getHibernateTemplate().save(entity); QX-M'ur99
} ~vR<UQz
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publicvoid persist(finalObject entity){ 2[Qzx%Vp
getHibernateTemplate().save(entity); +hWeN&A
} [9p@uRE
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publicvoid update(finalObject entity){ .e:+Ek+
getHibernateTemplate().update(entity); D>wo>,G
} Hc
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publicvoid delete(finalObject entity){ WN#dR~>
getHibernateTemplate().delete(entity); Hp
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} =0U"07%}
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publicObject load(finalClass entity, jm|zn
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finalSerializable id){ N4_V
return getHibernateTemplate().load W?@+LQa??
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(entity, id); /z(s1G.
} 9+>%U~U<
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publicObject get(finalClass entity, u-dF~.x
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finalSerializable id){ %A(hmC
return getHibernateTemplate().get
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(entity, id); o\yqf:V8
} kZ
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publicList findAll(finalClass entity){ ,!^w
return getHibernateTemplate().find("from }% ?WS
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" + entity.getName()); A'? W5~F
} D-5~CK4`
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publicList findByNamedQuery(finalString xWty2/!h
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namedQuery){ uFi[50
return getHibernateTemplate ^m^,:]I0P
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().findByNamedQuery(namedQuery); S>?B)
} *WXqN!:
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publicList findByNamedQuery(finalString query, ]GHx<5Q:\
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finalObject parameter){ V P4ToYc
return getHibernateTemplate >5]w\^QN9_
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().findByNamedQuery(query, parameter); 4>[tjz.?k
} B.[5N;c
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publicList findByNamedQuery(finalString query, QnDLSMx)
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finalObject[] parameters){ j: B,K.:
return getHibernateTemplate E@;v|Xc
1 ^=[k
().findByNamedQuery(query, parameters); : ]JsUb{YK
} \"@ `Rf
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publicList find(finalString query){ E;x~[MA
return getHibernateTemplate().find K,GX5c5
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(query); ?"qS%EH
} _^0)T@
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publicList find(finalString query, finalObject \~q cYp
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parameter){ -wV0Nv(V8
return getHibernateTemplate().find l{x?i00tAS
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(query, parameter); &($Zs'X
} 32V,25 (`5
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public PaginationSupport findPageByCriteria z'}?mE3i
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(final DetachedCriteria detachedCriteria){ NBZ>xp[U
return findPageByCriteria jk}m
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); >pl*2M&
} oE4hGt5x{
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public PaginationSupport findPageByCriteria ) N"gW*
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(final DetachedCriteria detachedCriteria, finalint %4E7 Tu,1
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startIndex){ (gv
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return findPageByCriteria D+
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(detachedCriteria, PaginationSupport.PAGESIZE, ETVT.R8
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startIndex); &9'JHF!l
} S\UM0G}v
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public PaginationSupport findPageByCriteria I2=Kq{
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(final DetachedCriteria detachedCriteria, finalint )Z 3fytY
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pageSize, 6Gs,-Kb:
finalint startIndex){ Cx/duodp
return(PaginationSupport) ^5~[G%G4
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getHibernateTemplate().execute(new HibernateCallback(){ $T0|zPK5
publicObject doInHibernate [%8+Fa~Wa
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(Session session)throws HibernateException { ^i^S1h"
Criteria criteria = j{'@g[HW
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detachedCriteria.getExecutableCriteria(session); fJC,ubP[5
int totalCount = MY["
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((Integer) criteria.setProjection(Projections.rowCount w,.Hdd6
, 0rC_)&B
()).uniqueResult()).intValue(); :+,qvu!M7
criteria.setProjection J=U7m@))Y#
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(null); b\\?aR
|
List items = vu.f B4
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criteria.setFirstResult(startIndex).setMaxResults !<2*B^
':w6{b
(pageSize).list(); n%<.,(.(S
PaginationSupport ps = zj;y`ENj
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new PaginationSupport(items, totalCount, pageSize, ;SVF"Uo
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startIndex); Ve8`5
return ps; [P{Xg:0
} 4"j5@bppJ
}, true); . yu
} LVLh&9
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public List findAllByCriteria(final wL 5).`oq
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DetachedCriteria detachedCriteria){ ;o3
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return(List) getHibernateTemplate <STjB,_s
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().execute(new HibernateCallback(){ XW Y0WDh:
publicObject doInHibernate ^J~}KOH
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(Session session)throws HibernateException { 1^Zx-p3J
Criteria criteria = <$njU=YE&
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detachedCriteria.getExecutableCriteria(session); ;|/7o@$n
return criteria.list(); 3G8uXB_`}
} 6]gs{zG
}, true); `u-VGd\
} J= |[G'
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public int getCountByCriteria(final -RH ?FJ
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DetachedCriteria detachedCriteria){ ak;Z;
Integer count = (Integer) r$\g6m
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getHibernateTemplate().execute(new HibernateCallback(){ Y!*,G]7
publicObject doInHibernate iQGoy@<R
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(Session session)throws HibernateException { G:e} >'
Criteria criteria = 3 ^su%z_%
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detachedCriteria.getExecutableCriteria(session); d)o<R;F
return JrL/LGY
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criteria.setProjection(Projections.rowCount IW BVfN->}
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()).uniqueResult(); ) L{Tn8
} {U(h]'
}, true); $uLzC]
return count.intValue(); VBCj.dw
} 8w*fg6,=
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用户在web层构造查询条件detachedCriteria,和可选的 UU
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 -owfuS?i=
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PaginationSupport的实例ps。 }>
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ps.getItems()得到已分页好的结果集 4r zioIk
ps.getIndexes()得到分页索引的数组 462ae`
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ps.getTotalCount()得到总结果数 *r%mqAx(
ps.getStartIndex()当前分页索引 "4?hK
ps.getNextIndex()下一页索引 !eTS PM
ps.getPreviousIndex()上一页索引 +`4}bc,G
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 IIR?@/q
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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 bT*4Qd4W
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一下代码重构了。 1aDDl-8,
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我把原本我的做法也提供出来供大家讨论吧: ( gFA? aD<
&sNID4FR
首先,为了实现分页查询,我封装了一个Page类: aw4+1.xy
java代码: T8(wzs
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/*Created on 2005-4-14*/ h9-Ky@X`
package org.flyware.util.page; y^Jv?`jw
jbGH3 L
/** RQ'c~D)X
* @author Joa dB,#`tc=,
* w:LCm `d
*/ 1c4%g-]7
publicclass Page { Iw:("A&~
v}Nx*%
/** imply if the page has previous page */ $^XPk#$m
privateboolean hasPrePage; k:qou})#4
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/** imply if the page has next page */ te''sydUS
privateboolean hasNextPage; a?MtY
EK2
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/** the number of every page */ W.R'2R#
privateint everyPage; Rp|&1nS
(j I|F-i
/** the total page number */ yy74>K
privateint totalPage; ? 7EVmF
d&u/7rm
/** the number of current page */ 4a |Fx
privateint currentPage; 3,5wWT]
)
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/** the begin index of the records by the current Mfr#IzNHN
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query */ c+{4C3z
privateint beginIndex; K{P#[X*5
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/** The default constructor */ #dt2'V- ,
public Page(){ b?NeSiswn
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} R qz()M
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/** construct the page by everyPage pdHb
* @param everyPage &NQR*Tn
* */ c]r|I%D
public Page(int everyPage){ NKKOA
this.everyPage = everyPage; ?t42=nvf
} UhTr<(@
kf!/9
/** The whole constructor */ zs:7!
public Page(boolean hasPrePage, boolean hasNextPage, j1C.#-P[
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int everyPage, int totalPage, @R&D["!
int currentPage, int beginIndex){ |Z^g\l.j{
this.hasPrePage = hasPrePage; ` W>B8
this.hasNextPage = hasNextPage; E|;5Z*
this.everyPage = everyPage; &RrQ()<as
this.totalPage = totalPage; 5O W(] y|
this.currentPage = currentPage; tQaCNS$=
this.beginIndex = beginIndex; 1n(}Q1fa
} hUxhYOp
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/** 3/=QZ8HA&-
* @return jFTV\|C
* Returns the beginIndex. 26VdRy{[
*/ 2H+DT-hK
publicint getBeginIndex(){ g VJ#LJ
return beginIndex; `UK+[`E
} Ux
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/** JwtI(>cI
* @param beginIndex WN/#9]` P
* The beginIndex to set. I=yj
*/ %u0;.3Gw
publicvoid setBeginIndex(int beginIndex){ *9ub.:EUwV
this.beginIndex = beginIndex; si_HN{
} }C"*ACjF
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/** ydqmuZ%2h#
* @return ]q7 LoH'S
* Returns the currentPage. +%\j$Pv
*/ 7U`S9DDwq
publicint getCurrentPage(){ #
pB:LPEsK
return currentPage; =DTOI
} e=UVsYNx
cloSJmUlQ
/** MH;%Y"EI
* @param currentPage dG?a"/MA
* The currentPage to set. ;6txTcn`=
*/ ^[[b$h$
publicvoid setCurrentPage(int currentPage){ %N>NOk)
this.currentPage = currentPage; {
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} ~o'#AP#N~
arQ%
/** #*$@_
* @return 7jH`_58
* Returns the everyPage. *F*jA$aY
*/ N$&ePU J
publicint getEveryPage(){ K[gWXBP
return everyPage; &qP-x98E?
} tZ
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:U. )YHY
/** rL
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* @param everyPage uBq3.+,x*
* The everyPage to set. u\6]^T6
*/ :+Q"MIU
publicvoid setEveryPage(int everyPage){ y*b.eO
this.everyPage = everyPage; dX@A%6#?
} {Y:ZY+
mhLRi\[c )
/** &f<1=2dm
* @return r82o[+$u0K
* Returns the hasNextPage. o$`kpr
*/ UnWGMo?JEi
publicboolean getHasNextPage(){ J1p75c%
return hasNextPage; 1 j^c
} -A%?T"
H'GYJ ?U"
/** km\ld&d]$
* @param hasNextPage .83v~{n
* The hasNextPage to set. -y*_.Ws9
*/ `$sY^EX
publicvoid setHasNextPage(boolean hasNextPage){ 1H4Zgh
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this.hasNextPage = hasNextPage; %^5 @z1d,
} >`<2}Me6
Fv);5LD
/** Dp*$GQ
* @return 1:x nD
* Returns the hasPrePage. %FyygT b;S
*/ r%,H*DOu
publicboolean getHasPrePage(){ _7#tgZyv
return hasPrePage; I>%S4Z+o
} n1>,#|#
H[7cA9FI
/** d$_q=ywc
* @param hasPrePage Hg9.<|+yo
* The hasPrePage to set. .?0>5-SfY
*/ @\T;PTD-
publicvoid setHasPrePage(boolean hasPrePage){ TA0D{
this.hasPrePage = hasPrePage; hiMyFvA4
} W8,t l>(
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/** Sq-3-w,R~
* @return Returns the totalPage. [Yy\>
* U$A7EFK'
*/ PyMVTP4
publicint getTotalPage(){ m@Ip^]9ry
return totalPage; >WGP{
} O5^J!(.O\Z
^b"bRQqm
/** pYfV~Q^3
* @param totalPage !b7'>b'J<1
* The totalPage to set. Y%/ YFO2vb
*/ Be{/2jU%
publicvoid setTotalPage(int totalPage){ {M@@)27gW
this.totalPage = totalPage; ; wbUk5Tf/
} #H;hRl
6)wy^a|pb
} 0F+zG)G"
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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 9fNu?dE
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个PageUtil,负责对Page对象进行构造: G'O/JM
java代码: ?Q96,T-)
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/*Created on 2005-4-14*/ ^XBzZ!h|
package org.flyware.util.page; ^Ti_<<X
-^iUVO`z
import org.apache.commons.logging.Log; $Ns,ts(ng
import org.apache.commons.logging.LogFactory; rBD(2M
AfRW=&xdT
/** X&(<G
* @author Joa N-2([v
* FjZc#\^9
*/ E.J0fwyT
publicclass PageUtil { `ke3+%uj o
9c6czirwR^
privatestaticfinal Log logger = LogFactory.getLog skIiJ'db
bo@,4xw
(PageUtil.class); ~+N76BX
*;hY.EuoFz
/** (*6m^
* Use the origin page to create a new page p^1zIC>F
* @param page PS=e\(6QC
* @param totalRecords #wenX$UTh3
* @return S\e&?Y`
*/ qKdS7SoS
publicstatic Page createPage(Page page, int N0Efw$u
2W^B{ZS;
totalRecords){ HDmx@E.@
return createPage(page.getEveryPage(), M18qa,fK{
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page.getCurrentPage(), totalRecords); 9u,8q:I.?
} G'f9N^w
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/** u8YB)kG
* the basic page utils not including exception <S1??
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handler )Hbb&F
* @param everyPage {O^TurbTFA
* @param currentPage l{Jt s I
* @param totalRecords $Y6I_U
* @return page 8Q2]*%
*/ $. %L
publicstatic Page createPage(int everyPage, int q!6|lZ B3
]^=|Zd-
currentPage, int totalRecords){ mxQR4"]jY
everyPage = getEveryPage(everyPage); Q>.BQ;q]
currentPage = getCurrentPage(currentPage); ^P`NMSw
int beginIndex = getBeginIndex(everyPage, wV\%R,bZj
egm)a
currentPage); P|e`^Frxt
int totalPage = getTotalPage(everyPage, pDu{e>S|:
*AZ?~ i^o
totalRecords); CqqXVF3
boolean hasNextPage = hasNextPage(currentPage, z[fB!O
s/
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totalPage); 0$6*o}N%
boolean hasPrePage = hasPrePage(currentPage); GCT@o!
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returnnew Page(hasPrePage, hasNextPage, 5h0>!0
everyPage, totalPage, gQ37>
currentPage, 0rD#s{?
mjb{~
beginIndex); LP:nba :
} 9)`amhf>
gv#4#]
privatestaticint getEveryPage(int everyPage){ ;7Y[c}V1^
return everyPage == 0 ? 10 : everyPage; ueDvMP
} @mf({Q>
7+}JgUh
privatestaticint getCurrentPage(int currentPage){ fb.J$fX
return currentPage == 0 ? 1 : currentPage; f/}
} @F>F#-2
845
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privatestaticint getBeginIndex(int everyPage, int ?i~g,P]NK
YNSyi@
currentPage){
mOP4z'
return(currentPage - 1) * everyPage; kbxg_UI;
} f~=r*&U
X7aYpt;
privatestaticint getTotalPage(int everyPage, int I&Jt> O4
&