Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 "<b~pfCOQk
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 `[\*1GpAo
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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 v{4K$o
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 a.)Gd]}g
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分页支持类: `?VtB!p@x=
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java代码: 1c);![O
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package com.javaeye.common.util; .Q
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import java.util.List; Z\8TpwD2
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publicclass PaginationSupport { a>A29*q
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publicfinalstaticint PAGESIZE = 30; B:qH7`s
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privateint pageSize = PAGESIZE; shjbb
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privateList items; hEAt4z0P
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privateint totalCount; %!$ua_8
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privateint[] indexes = newint[0]; )M(; :#le
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privateint startIndex = 0; 'J~{8w,.
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public PaginationSupport(List items, int @$'k1f(u>
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totalCount){ QCkPua9
setPageSize(PAGESIZE); p]=a:kd4J
setTotalCount(totalCount); ,Zs:e.
setItems(items); GKdQ
setStartIndex(0); vy W/f
} 1zNH[
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public PaginationSupport(List items, int MB|+F
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totalCount, int startIndex){ 4$9WJ~V{
setPageSize(PAGESIZE); -1t"(v
setTotalCount(totalCount); xZAc~~9tD
setItems(items); B0I(/ 7
setStartIndex(startIndex); 6wH]W+A
} 9?<WRM3a>
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public PaginationSupport(List items, int qPsf`nI7
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totalCount, int pageSize, int startIndex){ TR3_!0
setPageSize(pageSize); hX4&B
setTotalCount(totalCount); 5D0O.v
setItems(items); `Q?rQ3A}
setStartIndex(startIndex); S'T&`"Mr
} ZrJAfd \5c
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publicList getItems(){ BeZr5I"`}
return items; mk?&`_X1
} x5\C MWW
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publicvoid setItems(List items){ v <1d3G=G
this.items = items; bqpy@WiI S
} x zmg'Br
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publicint getPageSize(){ *( ~7H6
return pageSize; .G#wXsJj
} A&_H%]{<:
;&4}hPq
publicvoid setPageSize(int pageSize){ &~oBJar
this.pageSize = pageSize; d`9%:2qE
} wi/Fx=w
; V)pXLE
publicint getTotalCount(){ Wk w.z
return totalCount; *gMo(-tN
} t_1(Ex
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publicvoid setTotalCount(int totalCount){ gj{2"tE
if(totalCount > 0){ c?oNKqPzg
this.totalCount = totalCount; |fX
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int count = totalCount / 6$-Ex
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pageSize; 0~{jgN~
if(totalCount % pageSize > 0) "IbXKS>t
count++; M:V'vme)+
indexes = newint[count]; rhU]b $A
for(int i = 0; i < count; i++){ 5P~{*of
indexes = pageSize * 3>X]`Oj7y
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i; KEF"`VTB@
} |uT|(:i84,
}else{ O>UG[ZgW
this.totalCount = 0; &u)
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} 5,
} ?K]Cs&E4
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publicint[] getIndexes(){ uCGJe1!Ai>
return indexes; =\mAvVe
} ]hY'A>4Uq
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publicvoid setIndexes(int[] indexes){ 9UlR fl
this.indexes = indexes; G3O`r8oZcJ
} Gs^hqT;h
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publicint getStartIndex(){ %Wy$m?gD
return startIndex; Zd$a}~4~
} ,h1
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publicvoid setStartIndex(int startIndex){ q~_DR4xZ
if(totalCount <= 0) It$'6HV~Sb
this.startIndex = 0; +>BLox6
elseif(startIndex >= totalCount) ph*9,\c8
this.startIndex = indexes qRk&b F/
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[indexes.length - 1]; KLVkPix;$
elseif(startIndex < 0) +o+e*B7Eh
this.startIndex = 0; NN(ZH73
else{ 49S*f
this.startIndex = indexes GG0l\!2)
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[startIndex / pageSize]; z0=(l?)#
} 9K~0:c
} h/`]=kCl
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publicint getNextIndex(){ y(gL.08<
int nextIndex = getStartIndex() + :iW+CD)j
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pageSize; F91uuSSL
if(nextIndex >= totalCount) f|U;4{k
return getStartIndex(); s|*0cK!K^
else L9(mY `d>"
return nextIndex; cE(P^;7D
} 9i+OYWUO
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publicint getPreviousIndex(){ ~<[$.8*
int previousIndex = getStartIndex() - byALM
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pageSize; )UBU|uYR\
if(previousIndex < 0) %eK=5Er jx
return0; P`ZzrN
else }J=>nL'B
return previousIndex; @\{L%y%a0
} aMaICM
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} gumT"x .^
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抽象业务类 !4"(>Rnw
java代码: QH z3
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/** .`./MRC
* Created on 2005-7-12 7 'T3Wc
*/ (i..7B:
package com.javaeye.common.business; c*>8VW>
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import java.io.Serializable; 4oxAC; L
import java.util.List; ^,W;dM2
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import org.hibernate.Criteria; Dnx` !
import org.hibernate.HibernateException; dJYsn+
import org.hibernate.Session; "AN*2)e4
import org.hibernate.criterion.DetachedCriteria; o2AfMSt.
import org.hibernate.criterion.Projections; kwI[BF
import aCxF{>n
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org.springframework.orm.hibernate3.HibernateCallback; ^"lVTDsU
import (^_j,4
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org.springframework.orm.hibernate3.support.HibernateDaoS ~PaEhj&8
}%^N9AA8
upport; YK xkO
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import com.javaeye.common.util.PaginationSupport; xxnvz
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public abstract class AbstractManager extends FX1[ 2\
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HibernateDaoSupport { "Zh3,
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privateboolean cacheQueries = false; oz.#+t%X$b
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privateString queryCacheRegion; L0lqm0h
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publicvoid setCacheQueries(boolean - uk}Fou
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cacheQueries){ qV$\E=%fhM
this.cacheQueries = cacheQueries; a,ff8Qm
} -- >q=hlA
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publicvoid setQueryCacheRegion(String Uf}u`"$F
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queryCacheRegion){ l('@~-Zy
this.queryCacheRegion = E|,RM;7
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queryCacheRegion; ^RI&`5g
} ;_~9".'<d
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publicvoid save(finalObject entity){ f>CJ1;][{
getHibernateTemplate().save(entity); GQH15_
} .&i_~?1[N
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publicvoid persist(finalObject entity){ +0l-zd\
getHibernateTemplate().save(entity); zJ*(G_H
} 5:yRFzhqd
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publicvoid update(finalObject entity){ '< .gKo
getHibernateTemplate().update(entity); {j8M78 }3
} 31GqWN`>$
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publicvoid delete(finalObject entity){ # 4&t09
getHibernateTemplate().delete(entity); 14pyHMOR
} vojXo|c
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publicObject load(finalClass entity, (Q?@LzCjy
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finalSerializable id){ ;F;Vm$
return getHibernateTemplate().load 0-Ga2Go9
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(entity, id); d-cW47
} kNd(KQ<.17
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publicObject get(finalClass entity, i5 0c N<o
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finalSerializable id){ z&c|2L-u6
return getHibernateTemplate().get ]3Y J a
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(entity, id); /O}lSXo6E
} WYN0,rv1:+
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publicList findAll(finalClass entity){ tMiy`CPh
return getHibernateTemplate().find("from 3GL,=q
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" + entity.getName()); G]n_RP$G
} Al1}Ir
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publicList findByNamedQuery(finalString 2!_DkE
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namedQuery){ 2Krh&
return getHibernateTemplate SE$~Wbj?
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().findByNamedQuery(namedQuery); g#q7~#9
} FnPn#Cv>*
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publicList findByNamedQuery(finalString query, YuUJgt .1
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finalObject parameter){ z"c,TlVN3
return getHibernateTemplate /|p\l"
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().findByNamedQuery(query, parameter); M%YxhuT0
} eiQ42x@Z
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publicList findByNamedQuery(finalString query, $ ~%w21?&
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finalObject[] parameters){ d=0{vsrB
return getHibernateTemplate
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().findByNamedQuery(query, parameters); jcp6-XM
} skYHPwJdW
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publicList find(finalString query){ V-(*{/^"
return getHibernateTemplate().find if?X^j0
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(query); =h70!) Z5
} JM7FVB
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publicList find(finalString query, finalObject "%YVAaN
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parameter){ ;@*<M\O
return getHibernateTemplate().find vaLP_V
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(query, parameter); B7wzF"
} 29^(weT"]
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public PaginationSupport findPageByCriteria Q@uWh:
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(final DetachedCriteria detachedCriteria){ }9 ]7V <
return findPageByCriteria #^}s1
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?
(detachedCriteria, PaginationSupport.PAGESIZE, 0); )KY4BBc
} t`Rbn{
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public PaginationSupport findPageByCriteria jwg*\HO,s
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(final DetachedCriteria detachedCriteria, finalint nvCp-Z$
<=Saf.
startIndex){ 'jXJ!GFw
return findPageByCriteria Z2 Vri
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(detachedCriteria, PaginationSupport.PAGESIZE, !+z&] S3s
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startIndex); "=ki_1/P
} V|TD+7.`QB
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public PaginationSupport findPageByCriteria l cM
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(final DetachedCriteria detachedCriteria, finalint }mo)OyIX
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pageSize, (-],VB
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finalint startIndex){ gCF9XKW
return(PaginationSupport) u_}UU
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getHibernateTemplate().execute(new HibernateCallback(){ 86e aX+F
publicObject doInHibernate a)*(**e$*i
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(Session session)throws HibernateException { H&
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Criteria criteria = 6HPuCP
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detachedCriteria.getExecutableCriteria(session); OrF.wcg
int totalCount = jZQ{XMF
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((Integer) criteria.setProjection(Projections.rowCount CED[\n
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()).uniqueResult()).intValue(); v$xurj:v#i
criteria.setProjection =4sx(<
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(null); Yhz Dw8f
List items = cE>m/^SKr
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criteria.setFirstResult(startIndex).setMaxResults iJeodfC
s)?GscPG!
(pageSize).list(); }]M'f:%b
PaginationSupport ps = \=P(?!v
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new PaginationSupport(items, totalCount, pageSize, kT]jJbb"
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startIndex); ,xR u74
return ps; &grvlK
} E,dUO;
}, true); R!
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} 89j:YfA=v
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public List findAllByCriteria(final L]H'
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DetachedCriteria detachedCriteria){ *&I
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return(List) getHibernateTemplate XwfR/4
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().execute(new HibernateCallback(){ |#{ i7>2U
publicObject doInHibernate ;>/yY]F7
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(Session session)throws HibernateException { >JA>np
Criteria criteria = 8_ascvs5
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detachedCriteria.getExecutableCriteria(session); ~W={"n?=
return criteria.list(); x}O,xquY
} R+t]]n6#
}, true); >|`1aCg,
} h6IO ;:P)
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public int getCountByCriteria(final $-|$4lrS
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S
DetachedCriteria detachedCriteria){ 0~+*$W
Integer count = (Integer) B'mUDW8\D
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getHibernateTemplate().execute(new HibernateCallback(){ 6nJQP a
publicObject doInHibernate jse!EtB:
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(Session session)throws HibernateException { hrO9_B|#
Criteria criteria = {LVA_7@
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detachedCriteria.getExecutableCriteria(session); z,hBtq:-$
return ir>S\VT4
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criteria.setProjection(Projections.rowCount Vr d16s
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()).uniqueResult(); kma>'P`G
} pr1bsrMuL
}, true); )pe17T1|
return count.intValue(); LE)$_i8gX
} xX9snSGz
} dz>Jl},`k
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用户在web层构造查询条件detachedCriteria,和可选的 Ycx}FYTY
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 +V9xKhR;x
s? Xgo&rS_
PaginationSupport的实例ps。 `iN\@)E
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ps.getItems()得到已分页好的结果集 V1GkX=H},
ps.getIndexes()得到分页索引的数组 4*9t:D|}
ps.getTotalCount()得到总结果数 s[dIWYs#
ps.getStartIndex()当前分页索引 [k(b<'
ps.getNextIndex()下一页索引 KF5r?|8M
ps.getPreviousIndex()上一页索引 ywkRH
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ~t/i0pKq.
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 x,cvAbwS
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一下代码重构了。 z]C=nXbk
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我把原本我的做法也提供出来供大家讨论吧: '-J<ib
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首先,为了实现分页查询,我封装了一个Page类: zUNUH^Il
java代码: _h1eW9q
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/*Created on 2005-4-14*/ ~(yW#'G
package org.flyware.util.page; L|:CQ
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/** Q4/BpKL
* @author Joa ;Zj(**#H
* _Gaem"k|
*/ S-ZN}N{,6
publicclass Page { w)RedJnf
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/** imply if the page has previous page */ #qR 6TM&;
privateboolean hasPrePage; 5XzsqeG|
A+frKoi
/** imply if the page has next page */ ZZHzC+O#^
privateboolean hasNextPage; Iz'Et'w8!
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/** the number of every page */ @iXBy:@
privateint everyPage; a
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/** the total page number */ aI;$N|]u
privateint totalPage; QtXiUx^ k<
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/** the number of current page */ :ir3u
privateint currentPage; n f<I
)8eb(!}7
/** the begin index of the records by the current @Tq-3Um
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query */ GvgTbCxnN
privateint beginIndex; r}^1dO
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5 r_Z3/%
/** The default constructor */ bu <d>XR
public Page(){ TXXG0 G
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} aPK:k$.
:8@eon}
/** construct the page by everyPage frDMFEXXP
* @param everyPage <y~Ba@1u
* */ :).NA
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public Page(int everyPage){ h(~/JW[
this.everyPage = everyPage; )"hd"
} -y|']I^ &
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/** The whole constructor */ )!cucY
public Page(boolean hasPrePage, boolean hasNextPage, CDXN%~0h
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int everyPage, int totalPage, 7CSz
int currentPage, int beginIndex){ :@"o.8p
this.hasPrePage = hasPrePage; }$L1A
this.hasNextPage = hasNextPage; Q_!tn*
this.everyPage = everyPage; 2#3`[+g<n
this.totalPage = totalPage; <H-kR\HF
this.currentPage = currentPage; MMC$c=4"
this.beginIndex = beginIndex; QA;,/iw `
} G3+e5/0
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/** `w`N5 !
* @return QKx(S=4jQ
* Returns the beginIndex. o#1Ta7Ro
*/ &"gX
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publicint getBeginIndex(){ bc~$"
return beginIndex; 9&Un|cr
} cn/&QA"
~6Fh,S1?
/** 8-7Ml3G*
* @param beginIndex EW vhT]<0
* The beginIndex to set. +HRtuRv0T
*/ =q)+_@24>d
publicvoid setBeginIndex(int beginIndex){ UR=s=G|
this.beginIndex = beginIndex; ?wv3HN
} Vn:v{-i
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/** =T26vu
* @return WQ.{Ag?1
* Returns the currentPage. t?)]xS)
*/
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publicint getCurrentPage(){ ]3,
return currentPage; DO-M0L
} ?E
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/** x|Pz24yP9
* @param currentPage IemhHf ^l
* The currentPage to set. 4q7H
*/ B[EOz\?=m
publicvoid setCurrentPage(int currentPage){ ;r~1TUKb
this.currentPage = currentPage; %saP>]o
} }qoId3iY!7
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/** ~MC5rOA
* @return
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* Returns the everyPage. Bhx.q,X
*/ mLkp*?sfC
publicint getEveryPage(){ *y7Yf7
return everyPage; ^W%F?#ELN2
} fQU_:[
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/** IBeorDIZ
* @param everyPage YcwDNsk
* The everyPage to set. 9W\"A$;+&
*/ T+EwC)Ll
publicvoid setEveryPage(int everyPage){ 0<uLQVoR2n
this.everyPage = everyPage; MaD| X_g
} 66
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/** iRkUL]H@&
* @return n{L^W5B
* Returns the hasNextPage. J(!=Dno
*/ 7A'E+>1d
publicboolean getHasNextPage(){ QJVB:>A
return hasNextPage; .=<s@Sg,t
} 4:Ju|g]O
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/** \ >wQyz
* @param hasNextPage "s]
* The hasNextPage to set. XRQ1Uh6
*/ [_3&
publicvoid setHasNextPage(boolean hasNextPage){ Zos.WS#
this.hasNextPage = hasNextPage; M=95E$6
} O`%F{&;29
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/** ~8(Xn2
* @return ?f3R+4
* Returns the hasPrePage. B=%%3V)2
*/ o@dTiQK_
publicboolean getHasPrePage(){ J1cz
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return hasPrePage; u*5}c7)uId
} 4|5;nxkGm8
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/** 1i.3P$F
* @param hasPrePage ??P\v0E
* The hasPrePage to set. 0m.`$nlV-
*/ <*^|Aj|#
publicvoid setHasPrePage(boolean hasPrePage){ kb"Fw:0
this.hasPrePage = hasPrePage; q27q/q8
} `EvO^L
LD
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/** FJ!`[.t1AU
* @return Returns the totalPage. M;3q.0MU
* pp1Kor
*/ 4Y3@^8h&=
publicint getTotalPage(){ xhho{
return totalPage; 0[<'ygu
} c V@^<
rr(kFQ"
/** "+qZv(
* @param totalPage >FHx],
* The totalPage to set. ZlE=P4`X:
*/ :8}Qt^p
publicvoid setTotalPage(int totalPage){ E>*Wu<<
this.totalPage = totalPage; 1R*;U8?
} R=,
pv'
xW9R-J\W
} k'&1,78[l
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VSCKWYy
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 mAW(j@5sp
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个PageUtil,负责对Page对象进行构造: XVfUr\=,T
java代码: 9
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/*Created on 2005-4-14*/ Gl3g.`X{$@
package org.flyware.util.page; j"TEp$x
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import org.apache.commons.logging.Log; sh` 3$ {
import org.apache.commons.logging.LogFactory; |Thm5,ao
F=*t]X[z}
/** #hs&)6Sf
* @author Joa Q hRj*,
* Pj g#
*/ ('j'>"1H
publicclass PageUtil { g[@0H=
Ge?DD,ac
privatestaticfinal Log logger = LogFactory.getLog Gx4uf
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(PageUtil.class); R8!~>$#C6)
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/** ]c'EJu
* Use the origin page to create a new page ']c;$wP
* @param page iK1{SgXrFI
* @param totalRecords VJW8%s[
* @return @V1FBw9S!@
*/ 5S&Qj7kr
publicstatic Page createPage(Page page, int yLXIjR
Xq37:E2
totalRecords){ /4+zT?f
return createPage(page.getEveryPage(), I~p*~mLh'
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page.getCurrentPage(), totalRecords); F2Ny=H&G
}
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/** |pMP-
* the basic page utils not including exception glM42s
S;8=+I,
handler 2Z<S^9O9
* @param everyPage S7cD}yx*[
* @param currentPage i88`W&tI{
* @param totalRecords (k"0/*F4_
* @return page 17;9> *O'
*/ [4IqHe
publicstatic Page createPage(int everyPage, int ~=HPqe8
{(F}SF{
currentPage, int totalRecords){ SbMRrWy
everyPage = getEveryPage(everyPage); JW2f 6!b
currentPage = getCurrentPage(currentPage); nDckT+eJ
int beginIndex = getBeginIndex(everyPage, k`[>Bk%b
F`,bFQ
currentPage); HJ"sK5Q
int totalPage = getTotalPage(everyPage, C deV3
vKdS1Dn1
totalRecords); |)O;+e\
boolean hasNextPage = hasNextPage(currentPage, ,1<6=vL
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totalPage); rXTdhw?+
boolean hasPrePage = hasPrePage(currentPage); ?aTC+\=
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returnnew Page(hasPrePage, hasNextPage, Qch'C0u
everyPage, totalPage, r<P? F
currentPage, z?`7g%Z?{
7+[L6q/K
beginIndex); q
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} !>K=@9NC|.
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privatestaticint getEveryPage(int everyPage){ ^$oEM0h
return everyPage == 0 ? 10 : everyPage; TDg<&ND3
} XC/M:2$
6B>*v`T:
privatestaticint getCurrentPage(int currentPage){ <FZ*'F*M
return currentPage == 0 ? 1 : currentPage; f!GFRMM1
} QT1oU P#*
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privatestaticint getBeginIndex(int everyPage, int C^U>{jf !
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currentPage){ += gU`<\
return(currentPage - 1) * everyPage; we*E}U4
} >w\3.6A
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privatestaticint getTotalPage(int everyPage, int qCm%};yt
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totalRecords){ 0PUSCka'6
int totalPage = 0; C'sA0O@O
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if(totalRecords % everyPage == 0) />PH{ l
totalPage = totalRecords / everyPage; w>RwEU+w=@
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totalPage = totalRecords / everyPage + 1 ; D42!#
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return totalPage; p8&rl|z|
} 1x+w|h
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privatestaticboolean hasPrePage(int currentPage){ y,<\d/YY@
return currentPage == 1 ? false : true; "*d%el\63
} %]F{aR
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privatestaticboolean hasNextPage(int currentPage, Fj<a;oV
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int totalPage){ =}SC .E\
return currentPage == totalPage || totalPage == "!Hm.^1
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0 ? false : true;
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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。 vFgnbWxG
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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 7zXX&