Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 jv<C#0E^
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 m]XG7:}V0
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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 )HaW# ,XB
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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 Zt3Y<3o
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分页支持类: f9ziSD#
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java代码: KG8:F].u(
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package com.javaeye.common.util; AEUXdMo
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import java.util.List; ;|a,1#x
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publicclass PaginationSupport { ,lsoxl
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publicfinalstaticint PAGESIZE = 30; N^Bjw?3
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privateint pageSize = PAGESIZE; ,m"0Bu2
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privateList items; `X mT)C
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privateint totalCount; 295U<
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privateint[] indexes = newint[0]; G\\0N^v
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privateint startIndex = 0; Y1=.46Ezf
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public PaginationSupport(List items, int n#\ t_/\
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totalCount){ xoT|fgb
setPageSize(PAGESIZE); e7# B?
setTotalCount(totalCount); [H-r0Ah
setItems(items); G/y@`A)
setStartIndex(0); Y\Grf$e
} -n>JlfCd2
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public PaginationSupport(List items, int
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totalCount, int startIndex){ &I= 27!S
setPageSize(PAGESIZE); v&#=1Zb
setTotalCount(totalCount); 1G6 %?Iph
setItems(items); Ok/U"N-
setStartIndex(startIndex); CcDi65s
} ,sk0){rW
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public PaginationSupport(List items, int BZdryk:S
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totalCount, int pageSize, int startIndex){ qhIO7h
setPageSize(pageSize); 2A,iY}R
setTotalCount(totalCount); U"0Ts!CABA
setItems(items); BS(XEmJn&j
setStartIndex(startIndex); @ xBw'
} M~o\K'
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publicList getItems(){ C{5^UCJkg
return items; |1rKGDc
} q%rfKHMA50
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publicvoid setItems(List items){ M8,_E\*
this.items = items; Q*GJREC
} >^U$2P
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publicint getPageSize(){ <}vult^
return pageSize; #("/ 1N6
} @An "ClDa
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publicvoid setPageSize(int pageSize){ qad`muAd
this.pageSize = pageSize; ruf*-&Kr7
} 3%J7_e'
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publicint getTotalCount(){ #&oL iz=hZ
return totalCount;
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} CSBk
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publicvoid setTotalCount(int totalCount){ G\I DgPj`
if(totalCount > 0){ s/"l ?d
this.totalCount = totalCount; / }tMb
int count = totalCount / ^kF-mM=
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pageSize; *pZhwO!D
if(totalCount % pageSize > 0) kv)IG$S0
count++; LY? `+/
indexes = newint[count]; H:x{qS4Si
for(int i = 0; i < count; i++){ ivi,/~L
indexes = pageSize * X
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} ryKc7<
}else{ a-9Y U
this.totalCount = 0; 'T_Vm%\)
} Zd Li<1P*d
} 1638U1
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publicint[] getIndexes(){ /2&:sHWW
return indexes; chQCl3&e^
} Cxt_QyL?
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publicvoid setIndexes(int[] indexes){ -9(9LU2
this.indexes = indexes; .]IidsgM
} SZ*Nr=X
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publicint getStartIndex(){ lZI?k=rWv
return startIndex; VEtdp*ot
} MD62ObK!
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publicvoid setStartIndex(int startIndex){ |oL}c!0vs
if(totalCount <= 0) .8I\=+Zi
this.startIndex = 0; EU0b>2n4
elseif(startIndex >= totalCount) FkS$x'~2$
this.startIndex = indexes F79!B
7/:C[J4GTN
[indexes.length - 1]; lCznH?[
elseif(startIndex < 0) ujt0?DM
this.startIndex = 0; lls-Nir%
else{ ,Zs"r}G^
this.startIndex = indexes Z_tK3kQa@&
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[startIndex / pageSize]; YgFmJ.1
} \]a@ NBv
} bV~z}V&
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publicint getNextIndex(){ UF$JVb
int nextIndex = getStartIndex() + xKZLXQ'e-
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pageSize; /@!%/Kl
if(nextIndex >= totalCount) 4)zHkN+
return getStartIndex(); HLa3lUo
else ~%8T_R /3
return nextIndex; SBNeN]
} 4J"S?HsW|
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publicint getPreviousIndex(){ yGN2/>]
int previousIndex = getStartIndex() - K< ;I*cAX
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pageSize; !MNnau%O
if(previousIndex < 0) rda/
return0; 6H)T=Z|
else \*(A1Vk
return previousIndex; `wzb}"gLsM
} x'c%w:
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} (H/2{##
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抽象业务类 Rx}*I00
java代码: >*v
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/** -!~T$}/F
* Created on 2005-7-12 2^\67@9
*/ t04_~e
package com.javaeye.common.business; 6~t;&)6J
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import java.io.Serializable; R'#1|eWCa
import java.util.List; cU+%zk
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import org.hibernate.Criteria; hS?pc<~`#
import org.hibernate.HibernateException; PU"C('AP
import org.hibernate.Session; Uzx,aYo X
import org.hibernate.criterion.DetachedCriteria; 3/j^Ao\fw
import org.hibernate.criterion.Projections; S>!
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import KTQy pv
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org.springframework.orm.hibernate3.HibernateCallback; d[p-zn.
import rKtr&w7X
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org.springframework.orm.hibernate3.support.HibernateDaoS ^E)*i#."4
%+=y!
upport; D>Ub)i
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import com.javaeye.common.util.PaginationSupport; 19r4J(pV
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public abstract class AbstractManager extends Vg>\@ C.s
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HibernateDaoSupport { &"h 9Awn2
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privateboolean cacheQueries = false; _yu d
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privateString queryCacheRegion; 3\ !DsPgW
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publicvoid setCacheQueries(boolean #jc+2F,+{
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cacheQueries){ ]WO0v`xh
this.cacheQueries = cacheQueries; ,bLHkBK
} aR2Vvo
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publicvoid setQueryCacheRegion(String x3`b5^
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queryCacheRegion){ EGY'a*]cU
this.queryCacheRegion = vZ
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queryCacheRegion;
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} c6;326aDq
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publicvoid save(finalObject entity){ Ub(8ko:8$
getHibernateTemplate().save(entity); >E9:3&[F
} 4Z&i\#Q
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publicvoid persist(finalObject entity){ HZG^o^o1l+
getHibernateTemplate().save(entity); dv_& ei
} oC~8h8"l
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publicvoid update(finalObject entity){ sM4Qu./
getHibernateTemplate().update(entity); {1<XOp#b
} #lf3$Tm D
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publicvoid delete(finalObject entity){ J#```cB
getHibernateTemplate().delete(entity); G<5i %@
} |9Gng`)
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publicObject load(finalClass entity, kvdiDo
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finalSerializable id){ 7eM:YqT/#
return getHibernateTemplate().load s y ]k
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(entity, id); [\Ks+S
} RSK~<Y@]q{
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publicObject get(finalClass entity, {N \ri{|
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finalSerializable id){ `YK2hr
return getHibernateTemplate().get j/oM^IY
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(entity, id); .[@TC@W
} }k`-n32)|
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publicList findAll(finalClass entity){ ^tw\F7
return getHibernateTemplate().find("from 3!&PI
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" + entity.getName()); eplz5%<
} 'V*ixK8R0
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publicList findByNamedQuery(finalString xD:t$~
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namedQuery){ )@IDmz>
return getHibernateTemplate @scy v@5)F
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().findByNamedQuery(namedQuery); GH6 HdZ
} 4;rt|X77
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publicList findByNamedQuery(finalString query, eaG _)y
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finalObject parameter){ \z~wm&
return getHibernateTemplate @1`!}.Tk
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().findByNamedQuery(query, parameter); 3? R56$-+
} z]^u@]@NC
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publicList findByNamedQuery(finalString query, x)wlp{rLf
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finalObject[] parameters){ y@T0
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return getHibernateTemplate ut<0-
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().findByNamedQuery(query, parameters); 3@t&5UjwQ
} )&nfV5@"
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publicList find(finalString query){ NSsLuM=.
return getHibernateTemplate().find $$,/F
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(query); K;,_P5J%
} 'e/= !"T
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publicList find(finalString query, finalObject tK|jh
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parameter){ FLb
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return getHibernateTemplate().find ~]d3
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(query, parameter); 3pV^Oe^9
} DCv=*=6w
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public PaginationSupport findPageByCriteria d,hKy2
)P>}uK;
(final DetachedCriteria detachedCriteria){ L/YEW7M
return findPageByCriteria 0xSWoz[i6~
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 2!}:h5
} /"f4aF[
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public PaginationSupport findPageByCriteria S4salpz
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(final DetachedCriteria detachedCriteria, finalint &e-MOM2&
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startIndex){ .# Jusd
return findPageByCriteria 5>S<9A|Q
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(detachedCriteria, PaginationSupport.PAGESIZE, &f;<[_QI=
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startIndex); /qKO9M5A
} y5p)z"
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public PaginationSupport findPageByCriteria RRasX;zK
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(final DetachedCriteria detachedCriteria, finalint S260h,(,
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pageSize, w[/_ o,R
finalint startIndex){ 2fa1jl
return(PaginationSupport) 0-=PP@W
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getHibernateTemplate().execute(new HibernateCallback(){ ++d%D9*V<
publicObject doInHibernate y|+n77[Gv
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(Session session)throws HibernateException { zFFip/z\
Criteria criteria = KeGGF]=>
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detachedCriteria.getExecutableCriteria(session); 5C G
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int totalCount = ~vL`[JiK
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((Integer) criteria.setProjection(Projections.rowCount Z
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()).uniqueResult()).intValue(); tn\PxT
criteria.setProjection KysJ3G.k\
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(null); w.:fl4V
List items = kf Xg\6uKc
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criteria.setFirstResult(startIndex).setMaxResults $Y\-X<gRH
$#HPwmd
(pageSize).list(); N!TC}#}l
PaginationSupport ps = gQ0W>\xz
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new PaginationSupport(items, totalCount, pageSize, l>J>?b=x"[
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startIndex); :
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return ps; *%(BE*C}
} [%1 87dz:D
}, true); 0C,2gcq
} M?nYplC
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public List findAllByCriteria(final ({5`C dVi
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DetachedCriteria detachedCriteria){ xc&&UKd
return(List) getHibernateTemplate @j{n
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().execute(new HibernateCallback(){ p_Yx"nO7
publicObject doInHibernate 5>nbA8
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(Session session)throws HibernateException { jkrv2 `"
Criteria criteria = jx?"m=`s:
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detachedCriteria.getExecutableCriteria(session); "L)=Y7Dx
return criteria.list(); kuZs30^
} ]6*+i $
}, true); ,5
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} B S^P&TR!
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public int getCountByCriteria(final ,iy;L_N
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DetachedCriteria detachedCriteria){ y?}R,5k
Integer count = (Integer) ]rY3bG'&
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getHibernateTemplate().execute(new HibernateCallback(){ `Cv@16
publicObject doInHibernate "(QI7:iM
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(Session session)throws HibernateException { z^YL$
Criteria criteria = ,xzSFs>2
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detachedCriteria.getExecutableCriteria(session); 8#_"WzDw
return A
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criteria.setProjection(Projections.rowCount )2YZ [~3
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()).uniqueResult(); G#f(oGn :
} +'!4kwT R
}, true); :VvJx]
return count.intValue(); (e~vrSk+)~
} o<f#Zi
} ~Bi{k'A9
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% njcWVP;
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用户在web层构造查询条件detachedCriteria,和可选的 @XSxoUF\
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 4hLv"R.
/qeSR3WC
PaginationSupport的实例ps。 0D=7Mef
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ps.getItems()得到已分页好的结果集 M?FbBJ`sF
ps.getIndexes()得到分页索引的数组 `BGU
ps.getTotalCount()得到总结果数 AY~~ a)V
ps.getStartIndex()当前分页索引 /`x)B(b
ps.getNextIndex()下一页索引 "?Mf%u1R
ps.getPreviousIndex()上一页索引 6j{O/
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 P?Fm<s:
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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 /EXubU73
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一下代码重构了。 l*0`{R
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我把原本我的做法也提供出来供大家讨论吧: %J
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首先,为了实现分页查询,我封装了一个Page类: [ ]LiL;A&
java代码: "p[FFg
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/*Created on 2005-4-14*/ VdfV5"
package org.flyware.util.page; pSml+A:
ap%
Y}
/** 0s%rd>3
* @author Joa } F; Nh7?
* KDmzKOl
*/ K7
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publicclass Page { i)[8dv
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/** imply if the page has previous page */ oP 0ZJK&;
privateboolean hasPrePage; -?K?P=B;X
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/** imply if the page has next page */ MGGc
privateboolean hasNextPage; e52y}'L
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/** the number of every page */ kl90w
privateint everyPage; 5 Y|(i1
Ksu_4dE
/** the total page number */ /t<C_lLM
privateint totalPage; 9}TQu0
a!?&8$^<
/** the number of current page */ }s7ibm'
privateint currentPage; -Jj"JN.
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/** the begin index of the records by the current Z%uDz3I\Q"
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query */ 6IQkP9P(
privateint beginIndex; JL7"}^
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/** The default constructor */ Gf|qc>j.b
public Page(){ >dTJ
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} mI[$c"!BD
4)4E/q/5
/** construct the page by everyPage VIi/=mO]
* @param everyPage *Pmk1h2
* */ Q:+cLl&;hB
public Page(int everyPage){ OlV'#D
this.everyPage = everyPage; V`7^v:
} !_|rVg.
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/** The whole constructor */ > 10pk
public Page(boolean hasPrePage, boolean hasNextPage, .vbUv3NI
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O [81nlhS0
int everyPage, int totalPage, !83N.
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int currentPage, int beginIndex){ \s[/{3
this.hasPrePage = hasPrePage; $7 08\!
this.hasNextPage = hasNextPage; UQ ~7,D`=#
this.everyPage = everyPage; 0qV"R7TW
this.totalPage = totalPage; @fVCGV?'
this.currentPage = currentPage; {m&8Viq1
this.beginIndex = beginIndex; 2EdKxw3$]
} ^6Std
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/** +-|D$@8S
* @return \40d?N#D
* Returns the beginIndex. M]Y72K^
*/ 6}RRrYL7I
publicint getBeginIndex(){ 8#S}.|"?F
return beginIndex; pNHO;N[&
} >^ E
kr_!AW<.tz
/** njk1x
* @param beginIndex y.LJ5K$&a
* The beginIndex to set. xGzp}
*/ ;8G( l
publicvoid setBeginIndex(int beginIndex){ N9M''H*VS
this.beginIndex = beginIndex; #0+`dI_5/
} PUdJ>U
NB z3j
/** FZEK-]h.
* @return Zy -&g:
* Returns the currentPage. ZL-YoMHc+_
*/ '|\et aD
publicint getCurrentPage(){ SseMTw:
return currentPage; &y}nd
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} g8_C|lVZi
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/** f.o,VVYi
* @param currentPage 7sQw&yUL)
* The currentPage to set. 1xJc[q
*/ \I"UW1)B
publicvoid setCurrentPage(int currentPage){ 5nGDt~a
this.currentPage = currentPage; 8%$Vj
} WB=pRC@
4[ S0~O{r
/** g 36\%L
* @return vlD!YNy
* Returns the everyPage. 9 pGND]tIi
*/ .=VtMi$n
publicint getEveryPage(){ ~)zoIM \
return everyPage; o@o6<OP^
} myVV5#{
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/** 6!,Am^uXM
* @param everyPage JYbE(&l%de
* The everyPage to set. oH/4opV
*/ _/W[=c
publicvoid setEveryPage(int everyPage){ 6T}bD[h4?
this.everyPage = everyPage; "rj qDpH
} %r<c>sFJN
Z(S=2r.
/** }+L!r53g6
* @return +q==Y/z
* Returns the hasNextPage. R|%R-J]
*/ Y=oj0(Q*
publicboolean getHasNextPage(){ 93Yo}6>
return hasNextPage; fwojFS.K
} [I;5V= bKW
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/** gDw:Z/1X`
* @param hasNextPage OAc*W<Q0
* The hasNextPage to set. 1$q>\
*/ u7=jtB
publicvoid setHasNextPage(boolean hasNextPage){ VK*2`Z1
this.hasNextPage = hasNextPage; H:X=v+W
} 0x}8}
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/** -}lcMZY
* @return /`3^?zlu"
* Returns the hasPrePage. )p-B@5bb
*/ r@xMb,!H
publicboolean getHasPrePage(){ ob
return hasPrePage; v5|X=B>&>
} y@;4F n/
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/** LF'M!C9|
* @param hasPrePage xg}RpC!
* The hasPrePage to set. gc:qqJi)X
*/ Lc|5&<8ZG1
publicvoid setHasPrePage(boolean hasPrePage){ ];waK2'2
this.hasPrePage = hasPrePage; .(Gq9m[~8H
} o0~+%&
K_iy^|0)5]
/** gY],
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* @return Returns the totalPage. B)F2SK<@
* 5#zwdoQ
*/ J?XEF@?'G
publicint getTotalPage(){ Ve,_;<F]S
return totalPage;
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} J}7iXTh
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/** eH2.,wY1
* @param totalPage }N_9&I
* The totalPage to set. _/"m0/,
*/ ?-,v0#
publicvoid setTotalPage(int totalPage){ V8>%$O
sw
this.totalPage = totalPage; =nEl m*E
} X[8m76/V
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} <^&NA<2
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9$,?Grw~
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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 oJK]oVX9i
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个PageUtil,负责对Page对象进行构造: rN)T xH&*p
java代码: pR8]HNY0
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/*Created on 2005-4-14*/ tr2@{xb
package org.flyware.util.page; M:W9h+z
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import org.apache.commons.logging.Log; U S+PI`
import org.apache.commons.logging.LogFactory; da3]#%i0
$4`RJ{ZJw]
/** _pQ9q&i4
* @author Joa guv)[:cd;
* ,MwwA@,9-
*/ ZD1UMB0$4
publicclass PageUtil { g2 uc+p
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privatestaticfinal Log logger = LogFactory.getLog KIdlndGs
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vd!
(PageUtil.class); 9)sGnD;
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/** R|h9ilc
* Use the origin page to create a new page ]*pALT6
* @param page 65RWaz;|
* @param totalRecords MpM-xz~
* @return VAc-RaA
*/ g% :Q86u
publicstatic Page createPage(Page page, int GmN} +(
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totalRecords){ w}<BO>
z
return createPage(page.getEveryPage(), j_SRCm~:
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page.getCurrentPage(), totalRecords); q>w@W:t Z
} #rzq9}9tB
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/** :{C#<g`
* the basic page utils not including exception GVZ/`^ndM
%;9f$:U
handler !z X`M1J
* @param everyPage /ocdAW`0
* @param currentPage +Ij>\;vM"
* @param totalRecords 02&m