Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 pRWEBd1U
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 %:2EoXN"
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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 QZ?# ixvJ
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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 POvxZU
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分页支持类: kt`_n+G
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java代码: Y-!~x0-H
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package com.javaeye.common.util; _gU:!:}
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import java.util.List; <;Q1u,Mc
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publicclass PaginationSupport { Lzmdy0!'
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publicfinalstaticint PAGESIZE = 30; z=mH\!
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privateint pageSize = PAGESIZE; [v47_ 5O
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privateList items; O2i7w1t
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privateint totalCount; #b~B
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privateint[] indexes = newint[0]; Lx%*IE|c
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privateint startIndex = 0; T_t5Tg~i[N
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public PaginationSupport(List items, int 7LEB,bU
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totalCount){ LSewMj
setPageSize(PAGESIZE); pK` 1pfih
setTotalCount(totalCount); WX"iDz.
setItems(items); r<'ni
setStartIndex(0); G47(LE"2b
} !8g419Yg
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public PaginationSupport(List items, int ?^Gi;d5
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totalCount, int startIndex){ -e_91WI
setPageSize(PAGESIZE); *Bfo"["0.
setTotalCount(totalCount); \c')9g@
setItems(items); /80H.|8O
setStartIndex(startIndex); ]MD,{T9l\>
} zM+4<k_dH]
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public PaginationSupport(List items, int pbCj
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{ 6
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totalCount, int pageSize, int startIndex){ -VZn`6%s
setPageSize(pageSize); DWv(|gO
setTotalCount(totalCount); Lql2ry$Wa
setItems(items); Borr
setStartIndex(startIndex); k8KRVXgx
} )Ehi8
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publicList getItems(){ ./]xn
return items; Q};n%&n&
} fe!eZiE
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publicvoid setItems(List items){ @h&:xA56
this.items = items; rn$G.SMgz
} Cn"_x
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publicint getPageSize(){ YD3jP}Ym
return pageSize; yj$$k~@
} "Jahc.I
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publicvoid setPageSize(int pageSize){ z`"*60b
this.pageSize = pageSize; jgvzp
} SND@#?hiO
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publicint getTotalCount(){ Vu`5/QDq
return totalCount; 1Clid\T,o
} uTShz3
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publicvoid setTotalCount(int totalCount){ `
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if(totalCount > 0){ /0Jf/-}ovn
this.totalCount = totalCount; eA{nwtN
int count = totalCount / >&DC[)28
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pageSize; [psZc'q
if(totalCount % pageSize > 0) dhX$b!DA
count++; Sj ly]
indexes = newint[count]; /!#A'#Z
for(int i = 0; i < count; i++){ <ni_78
indexes = pageSize * c;?J
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} z!M #
}else{ p4F%FS:`
this.totalCount = 0; jn
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} eJ*u]GH U
} t$Bu<frQ
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publicint[] getIndexes(){ 8(Cs<C!
return indexes; KqN;a i,F
} tj ?%{L
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publicvoid setIndexes(int[] indexes){ o)bKs>`
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this.indexes = indexes; SK5_^4
} 1> v(&;K
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publicint getStartIndex(){ XDY QV.Bv
return startIndex; 5tI#UBha
} zv7)JH7EV&
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publicvoid setStartIndex(int startIndex){ s
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if(totalCount <= 0) ew \WV"
this.startIndex = 0; qeW.~B!B
elseif(startIndex >= totalCount) EI9;J-c
this.startIndex = indexes x8xz33
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[indexes.length - 1]; 85f:!p
elseif(startIndex < 0) LOgFi%!6:
this.startIndex = 0; d5>EvK U
else{ t~H0Qeb[v=
this.startIndex = indexes '3w%K+eJY
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[startIndex / pageSize]; 3ey.r%n
} .=)[S5.BVq
} abAw#XQ8
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publicint getNextIndex(){ sf0\#Q
int nextIndex = getStartIndex() + VKtlAfXy~
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pageSize; YQ@2p?4m
if(nextIndex >= totalCount) p"FWAC!
return getStartIndex(); EKD#s,(V*X
else !F:mDZeY
return nextIndex; A^E 6)A=
} Gshy$'_e
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publicint getPreviousIndex(){ Ge @qvP_
int previousIndex = getStartIndex() - ^AShy`o^X
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pageSize; P(s:+
if(previousIndex < 0) [dR#!"6t
return0; BoQ%QV69%
else G!`PP
return previousIndex; 0x,**6
} !>"fDz<w`
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} $|g
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抽象业务类
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java代码: #K`0b$
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/** SA#01}&p
* Created on 2005-7-12 obGhO
*/ kdWUz(
package com.javaeye.common.business; <$@I*xk[
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import java.io.Serializable; wMw}3qX$j
import java.util.List; J0
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import org.hibernate.Criteria; vsyg u
import org.hibernate.HibernateException; +?W4ac1
import org.hibernate.Session; +0 }_X
import org.hibernate.criterion.DetachedCriteria; @( \R@`#
import org.hibernate.criterion.Projections; n!.=05OtX
import Yo1]HG(kXB
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org.springframework.orm.hibernate3.HibernateCallback; (/0dtJ
import W"*2,R[}%
@}19:A<'
org.springframework.orm.hibernate3.support.HibernateDaoS \>>P%EU,
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upport; Q)y5'u qZ
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import com.javaeye.common.util.PaginationSupport; "G-h8IN^O
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public abstract class AbstractManager extends Ozhn`9L+1!
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HibernateDaoSupport { xmEom
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privateboolean cacheQueries = false; $Mj\ 3
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privateString queryCacheRegion; {NQCe0S+p
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publicvoid setCacheQueries(boolean @e& 0Wk
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cacheQueries){ o$Ylqb#
this.cacheQueries = cacheQueries; o<iU;15
} 1<fW .Q)
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publicvoid setQueryCacheRegion(String _si 5z
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queryCacheRegion){ K3<A<&W_-
this.queryCacheRegion = _;U%`/T b
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queryCacheRegion; 6D[]Jf,9
} FF#+d~$z
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publicvoid save(finalObject entity){ t1 U+7nM
getHibernateTemplate().save(entity); K9.Gjw
} '.;{"G.@'
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publicvoid persist(finalObject entity){ wPm
getHibernateTemplate().save(entity); |`Noj+T47I
} 3^nH>f-Y
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publicvoid update(finalObject entity){ ^[r1Dk
getHibernateTemplate().update(entity); ;gZ/i93:Q
} GB^ `A
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publicvoid delete(finalObject entity){ :F@Uq<~(
getHibernateTemplate().delete(entity); "&/2@
} g`Cv[Pq?at
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publicObject load(finalClass entity, HzKY2F(,
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finalSerializable id){ zeuj
return getHibernateTemplate().load K6
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(entity, id); @M B)B5
} `Fo/RZOW
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publicObject get(finalClass entity, ;3wO1'=
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finalSerializable id){ fqY'Uq$=
return getHibernateTemplate().get oSmETk\
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(entity, id); ,OubKcNg
} <qpzs@
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publicList findAll(finalClass entity){ @!'}=?`
return getHibernateTemplate().find("from 3 (\D.Z
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" + entity.getName()); @v^j<B
} }mK,Bi?bj
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publicList findByNamedQuery(finalString s[y.gR.(
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namedQuery){
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return getHibernateTemplate ~Ck OiWC0
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().findByNamedQuery(namedQuery); r~h#
} K)!^NT
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publicList findByNamedQuery(finalString query, .?Y"o3
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finalObject parameter){ j}",+Hv
return getHibernateTemplate pvsa?z;rP
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().findByNamedQuery(query, parameter); Y
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} r
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publicList findByNamedQuery(finalString query, =t)qy5
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finalObject[] parameters){ z8awND
return getHibernateTemplate <\ <o#Vq
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().findByNamedQuery(query, parameters); p> >H$t
} tkcs6uy
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publicList find(finalString query){ znTi_S
return getHibernateTemplate().find -u'"l(n)~
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(query); irD5;xk([
} l#1#3F
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publicList find(finalString query, finalObject ?..BA&zRk
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parameter){ &`v?oN9$
return getHibernateTemplate().find ?@,EGY<
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(query, parameter); 8\{z>y
} F[Mwd &P@
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public PaginationSupport findPageByCriteria S\N1qux{
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(final DetachedCriteria detachedCriteria){ r4X}U|s!0
return findPageByCriteria 4k@n5JNa
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); >bze0`}Z
} 0t^FM<7G
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public PaginationSupport findPageByCriteria <JWU@A-.y
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(final DetachedCriteria detachedCriteria, finalint M=uT8JB
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startIndex){ pN5kcvQ
return findPageByCriteria HS{Vohy >
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(detachedCriteria, PaginationSupport.PAGESIZE, )^{}ov
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startIndex); VnsV&cx
} v
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public PaginationSupport findPageByCriteria S
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(final DetachedCriteria detachedCriteria, finalint I@ueeDY
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pageSize, &=kv69v
finalint startIndex){ P\ke%Jdpw?
return(PaginationSupport) /ki-Tha
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getHibernateTemplate().execute(new HibernateCallback(){ oc( '!c
publicObject doInHibernate WSH[*jMA
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(Session session)throws HibernateException { M@.S Q@E
Criteria criteria = } jJKE
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detachedCriteria.getExecutableCriteria(session); mYgfGPF`
int totalCount = Mi8)r_l%O
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((Integer) criteria.setProjection(Projections.rowCount +mVAmG@
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()).uniqueResult()).intValue(); l5Bm.H_
criteria.setProjection PO"lY'W.U
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(null); `w:kY9
List items = p!YK~cH[
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criteria.setFirstResult(startIndex).setMaxResults T(*,nJi~9
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(pageSize).list(); )DXt_leLg
PaginationSupport ps = <C'_:&M
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new PaginationSupport(items, totalCount, pageSize, 80@\e
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startIndex); ?/3wO/7[
return ps; z.cDbkf}
} H 1kI+YJ@
}, true); B&a{,.m&q6
} c{/R?<
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public List findAllByCriteria(final 5 qfvHQ ~M
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DetachedCriteria detachedCriteria){ ;b0Q%TDh
return(List) getHibernateTemplate U~:H>
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().execute(new HibernateCallback(){ F0U %m
publicObject doInHibernate lrv-[}}
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(Session session)throws HibernateException { 1z6aMd6.
Criteria criteria = OX;(Mg|
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detachedCriteria.getExecutableCriteria(session); rc8HZ
return criteria.list(); @ar%`+_
} \
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}, true); 7y|U!r"Y
} D j9aTO
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public int getCountByCriteria(final 8/aJ4w[A
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DetachedCriteria detachedCriteria){ /(BS<A
Integer count = (Integer) 3$!QP
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getHibernateTemplate().execute(new HibernateCallback(){ PK:Lv15"r
publicObject doInHibernate TRi#
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(Session session)throws HibernateException { );.$`0
Criteria criteria = crIF5^3Yby
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detachedCriteria.getExecutableCriteria(session); b\(f>g[
return / 3N2?zS{
{S=<(A@
criteria.setProjection(Projections.rowCount _VT{2`|})
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()).uniqueResult(); caQ1SV^{9
} d%P2V>P
}, true); "mJo<i}
return count.intValue(); 2X2Ax~d@
} F|F0#HC ?
} yQrgOdo,w
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用户在web层构造查询条件detachedCriteria,和可选的 -NwG'
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 %Y ZCdS
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PaginationSupport的实例ps。 _;PQt" ]
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ps.getItems()得到已分页好的结果集 kc2B_+Y1
ps.getIndexes()得到分页索引的数组 0cHcBxdF
ps.getTotalCount()得到总结果数 Eg`~mE+a
ps.getStartIndex()当前分页索引 M$EF 8
ps.getNextIndex()下一页索引 UmVn: a
ps.getPreviousIndex()上一页索引 <9pI~\@w
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 viG= Ap.Th
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 R9A:"sJ
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一下代码重构了。 pA .orx
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我把原本我的做法也提供出来供大家讨论吧: !hQ-i3?qm
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首先,为了实现分页查询,我封装了一个Page类: wetu.aMp
java代码: gaXo)o S
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/*Created on 2005-4-14*/ = cxO@Fu
package org.flyware.util.page; U[pHT _U
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/** _W(xO
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* @author Joa R WY>`.su
* Bdh*[S\u@E
*/ c_qox
publicclass Page { )$^xbC#j`3
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/** imply if the page has previous page */ h:pgN,W}
privateboolean hasPrePage; H,KH}25
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/** imply if the page has next page */ -J63'bb7oi
privateboolean hasNextPage; 'n7|fjX?Y
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/** the number of every page */ s&ox%L4
privateint everyPage; &G%AQpDW5
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/** the total page number */ qE2<vjRg
privateint totalPage; R,D/:k'~k
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/** the number of current page */ Ut~YvWc9
privateint currentPage; -!+i
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/** the begin index of the records by the current lJAzG,f
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query */ LF.i0^#J
privateint beginIndex; g[i;>XyP
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/** The default constructor */ @GAj%MK$
public Page(){ ;L87
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} <6]Hj2
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/** construct the page by everyPage d
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* @param everyPage FsUH/Y
y
* */ P:6K
public Page(int everyPage){ jR1^e$
this.everyPage = everyPage; Nkb%4ofKqu
} AIl`>ac
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/** The whole constructor */ IJ.H/l}h
public Page(boolean hasPrePage, boolean hasNextPage, `ci
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int everyPage, int totalPage, mu0L_u(P
int currentPage, int beginIndex){ k7:ISjJ
this.hasPrePage = hasPrePage; bL<H$DB6
this.hasNextPage = hasNextPage; G AH<
this.everyPage = everyPage; :D}?H@(69
this.totalPage = totalPage; @I Y<i5(
this.currentPage = currentPage; b^i$2$9_
this.beginIndex = beginIndex; 2FL_!;p;2E
} 1;./e&%%
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/** :fX61S6)
* @return d<?Zaehe\
* Returns the beginIndex. :OU(fz]
*/ T:Q+ Z }v+
publicint getBeginIndex(){ "nJMS6HJ[
return beginIndex; uR")@Tc
} xg%{p``
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/** :zC=JvKT
* @param beginIndex mq<:^
* The beginIndex to set. 56."&0
*/ ^38kxwh
publicvoid setBeginIndex(int beginIndex){ 9&kY>M>z0
this.beginIndex = beginIndex; :1'1n
} x2~fc
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/** zGO_S\
* @return ;,/G*`81B
* Returns the currentPage. P[`>*C\9c
*/ p^{yA"MQ
publicint getCurrentPage(){ f3,Xb
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return currentPage; k"dE?v\cG
} ViOXmK"
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/** V'.gE6we
* @param currentPage HU
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* The currentPage to set. zxv y&
*/ k?pNmKVJM
publicvoid setCurrentPage(int currentPage){ "}uu-5]3
this.currentPage = currentPage; T?n [1%K
} P'5Lu
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/** ]w)uo4<^J
* @return (s1iYK
* Returns the everyPage. UQ e1rf
*/ GYT0zMMf
publicint getEveryPage(){ y#ON=8l
return everyPage; _n*gj-
} 10dK%/6/O
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/** ;h~k B
* @param everyPage +ZwTi!W
* The everyPage to set. UA0R)BH'
*/ Dxr4B<
publicvoid setEveryPage(int everyPage){ q<g!bW%
this.everyPage = everyPage; 1{xkAy0
} odeO(zuU
_=5\ $6
/** ,E(M<n|.
* @return wGz_IL.D
* Returns the hasNextPage. w@N)Pu
*/ F0'o!A#|(
publicboolean getHasNextPage(){ sGMnm
return hasNextPage; [di&N!Ao
} ]w8h#p
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/** IgF#f%|Q
* @param hasNextPage >vfLlYx
* The hasNextPage to set. |Pse=_i
*/ ijNI6_eU
publicvoid setHasNextPage(boolean hasNextPage){ A.P*@}9
this.hasNextPage = hasNextPage; YBk* CW9
} e $5s],,n
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/** j;rxr1+w
* @return l~`JFWur]
* Returns the hasPrePage. \ ]h$8JwV
*/ /3`fO^39Ta
publicboolean getHasPrePage(){ #b=*hi`E
return hasPrePage; No/D"S#
} Zvz}Z8jW
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/** GsWf$/iC:
* @param hasPrePage BI6`@}%7>
* The hasPrePage to set. na/,1iI<
*/ 7
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publicvoid setHasPrePage(boolean hasPrePage){ n22OPvp
this.hasPrePage = hasPrePage; jAFJ?L(
} 7mS_Cz+cB
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/** H%Sx*|
* @return Returns the totalPage. Gc!&I+kd
* '^t(=02J
*/ 4kLTKm:G
publicint getTotalPage(){ Q mz3GH@wg
return totalPage; Fo|
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} k:E+]5
Bk4|ik}
/** |fWR[\NU
* @param totalPage ^#j{9FpPs
* The totalPage to set. ViG-tb
*/ =$%_asQJ
publicvoid setTotalPage(int totalPage){ \o!B:Vb<
this.totalPage = totalPage; cp 7;~i3
} EG!):P
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} E'_$?wWn5
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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 U[l{cRT
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个PageUtil,负责对Page对象进行构造: (@u"
java代码: v%2Jm!i+
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/*Created on 2005-4-14*/ UXV>#U?
package org.flyware.util.page; fxX4 !r
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import org.apache.commons.logging.Log; [;i3o?\_I
import org.apache.commons.logging.LogFactory; ,G(bwE9~
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V
/** c"@,|wCUi
* @author Joa c:G0=5
* 'ZQR@~G
*/ QW"BGg~6c
publicclass PageUtil { X6c ['Zrc
Uv/?/;si
privatestaticfinal Log logger = LogFactory.getLog 9ioV R
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(PageUtil.class); xYWg1e$k
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/** J"RmV@|
* Use the origin page to create a new page \rf2Os
* @param page Dmv@ljwO
* @param totalRecords 0_-NE4SM/
* @return Q" an6ht|
*/ qw%wyj7
publicstatic Page createPage(Page page, int +q4AK<y-
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totalRecords){ @8GW?R
return createPage(page.getEveryPage(), 'uA$$~1
mq~L1<f
page.getCurrentPage(), totalRecords); *6%r2l'kZ
} '@+a]kCMev
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/** |yow(2(F@
* the basic page utils not including exception 0xg6
e!~x-P5M`
handler }fKpih
* @param everyPage wNm~H
* @param currentPage T8rf+B/.L
* @param totalRecords g{06d~Y
* @return page cH%#qE3
*/ b:}+l;e52
publicstatic Page createPage(int everyPage, int \a\ApD
c 7uryL
currentPage, int totalRecords){ /_*L8b
everyPage = getEveryPage(everyPage); {]\!vG6
currentPage = getCurrentPage(currentPage); 14v,z;HXj
int beginIndex = getBeginIndex(everyPage, /?P="j#u
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currentPage); bfjtNF*^
int totalPage = getTotalPage(everyPage, BWN[>H %S
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Tem:/
totalRecords); 2r=A'
boolean hasNextPage = hasNextPage(currentPage, v'zf*]9
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totalPage); v(tr:[V
boolean hasPrePage = hasPrePage(currentPage); h
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returnnew Page(hasPrePage, hasNextPage, Z,osdF
everyPage, totalPage, q9&d24|
currentPage, ^g56:j~?
77ID
82
beginIndex); 4h[^!up.7
} GM<r{6Qy
&<sN(;%0R
privatestaticint getEveryPage(int everyPage){ Q@lJ|
return everyPage == 0 ? 10 : everyPage; 7 n=fB#!*3
} ( nH3
U0:tE>3`
privatestaticint getCurrentPage(int currentPage){ 2x7%6'
return currentPage == 0 ? 1 : currentPage; B3^4,'
} G_]
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privatestaticint getBeginIndex(int everyPage, int jreY'y:
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currentPage){ ~^Y(f'{
return(currentPage - 1) * everyPage; U\ A*${
} {s=$.Kg
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privatestaticint getTotalPage(int everyPage, int EI29;
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totalRecords){ HEjrat;5
int totalPage = 0; Wh)QCp0|n
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if(totalRecords % everyPage == 0) QxmVImn"
totalPage = totalRecords / everyPage; FFNv'\)
else Y`u.P(7#
totalPage = totalRecords / everyPage + 1 ; q)uq?sZe
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return totalPage; IYy2EK[s
} AdtAc$@xK
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privatestaticboolean hasPrePage(int currentPage){ Pxj?W'|
return currentPage == 1 ? false : true; VlVd"jW
} ;Vad| -
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privatestaticboolean hasNextPage(int currentPage, " (+>#
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int totalPage){ EnrRnVB
return currentPage == totalPage || totalPage == RJ%~=D
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0 ? false : true; ;!k1LfN
} l\yFx
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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。 @^vVou_
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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 I hvL2zB
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做法如下: j`\} xDg
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 D'>yu"
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的信息,和一个结果集List: .!
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java代码: t`DoTb4
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/*Created on 2005-6-13*/ 6|05-x|
package com.adt.bo; $H/3t? 6h`
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import java.util.List; &Q^M[X
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import org.flyware.util.page.Page; HzM^Zn57%
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/** 67Ai.3dR
* @author Joa m?_S&/+*
*/ ()vxTTa
publicclass Result { v!ULErs
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private Page page; O1@xF9<
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private List content; cT8jG,+"}
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/** N`/6
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* The default constructor W:P4XwR{
*/
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public Result(){ lhx6+w
super(); L^VG?J
} <!&&Qd-d6H
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/**
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* The constructor using fields POc<
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* ~l-Q0wg
* @param page "}|n;:r
* @param content L&