Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 _Hhf.DmUAH
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 :gD=F &V
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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 "iu9r%l94
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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 g4Y1*`}2f
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分页支持类: #@rvoi
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java代码: _6y#?8RMB
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package com.javaeye.common.util; V7+fNr]I
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import java.util.List; uq.!{3)8
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publicclass PaginationSupport { 9L2]PU
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} D'pyTf[
publicfinalstaticint PAGESIZE = 30; AQx:}PO
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privateint pageSize = PAGESIZE; hH&A1vUv
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privateList items; (qG}`?219J
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privateint totalCount; aR- ?t14
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privateint[] indexes = newint[0]; gK_^RE9~
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privateint startIndex = 0; ,QB]y|:
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public PaginationSupport(List items, int 2LO8SJ#
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totalCount){ 8@$`'h^6
setPageSize(PAGESIZE); uWtj?Q+M|
setTotalCount(totalCount); i[IOR0
setItems(items); xF/u('A
setStartIndex(0); JX.3b_O
} 8^ujA
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public PaginationSupport(List items, int W(gOidKKz
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totalCount, int startIndex){ 0~/'c0Ho
setPageSize(PAGESIZE); ]!um}8!}
setTotalCount(totalCount); Em<B9S
setItems(items); |~+i=y
setStartIndex(startIndex); Oq`CK f
} f/?uosS
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public PaginationSupport(List items, int Z,jR:_p
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totalCount, int pageSize, int startIndex){ k1.h |&JJN
setPageSize(pageSize); (C3:_cM5
setTotalCount(totalCount); ~W>3EJghR,
setItems(items); {^z>uRZ3
setStartIndex(startIndex); eBZ94rA]
} ^t2b`n60
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publicList getItems(){ qh]D=i
return items; }x A Eu,n^
} 99KW("C1F
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publicvoid setItems(List items){ xlP0?Y1Bl
this.items = items; K Y=$RO
} (:9=M5d
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publicint getPageSize(){ >WcOY7
return pageSize; "9^OT
} (zmLMG(R
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publicvoid setPageSize(int pageSize){ 2]UwIxzR
this.pageSize = pageSize; r.JM!x8
} p0|PVn.^h
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publicint getTotalCount(){ b_&KL_vo{|
return totalCount; ] >4CBm$
} Fd1t/B,
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publicvoid setTotalCount(int totalCount){ k9*6`w
if(totalCount > 0){ gb^<6BYUG
this.totalCount = totalCount; d5YL=o
int count = totalCount / VE $Kdo^
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pageSize; ty>9i]Y-
if(totalCount % pageSize > 0) u[<ij
count++; hN U.y
indexes = newint[count]; .gJv})Vi
for(int i = 0; i < count; i++){ Xt%y>'.
indexes = pageSize * qydRmi
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} A=f)ntH~
}else{ Y(<(!TJ-
this.totalCount = 0; 8=-/0y9,
} o]<@E u G
} ml1My1
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publicint[] getIndexes(){ }v`Z.?|Z
return indexes; *km!<L7Y
} q&nEodv>+
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publicvoid setIndexes(int[] indexes){ MFtC2*
this.indexes = indexes; r @URs;O=
} PN"=P2e/ 6
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publicint getStartIndex(){ .P(Ax:g
return startIndex; wlEmy.)H
} g/W&Ap;qVL
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publicvoid setStartIndex(int startIndex){ n.b_fkZNr
if(totalCount <= 0) Fp(-&,L0fc
this.startIndex = 0; zLSha\X
elseif(startIndex >= totalCount) ~j36(`t
this.startIndex = indexes Srom@c
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[indexes.length - 1]; !F08F>@D
elseif(startIndex < 0) \^3cNw
this.startIndex = 0; @M)"
else{ ]A,Og_g
this.startIndex = indexes y6P-:f/&*
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[startIndex / pageSize]; bNG7A[|B
} J] )gXVRM
} b\Mb6s
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publicint getNextIndex(){ xxZO{_q
int nextIndex = getStartIndex() + XNr8,[c
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pageSize; }Sh3AH/
if(nextIndex >= totalCount) bcUa'ZfN<
return getStartIndex(); ?hOvY)
else `s\E"QeZN
return nextIndex; KN:V:8:J
} m+EtB6r
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publicint getPreviousIndex(){ GDwijZw
int previousIndex = getStartIndex() - >l =;6QL
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pageSize; l}XnCOIT,
if(previousIndex < 0) %g7B*AX]
return0; |o#pd\
else -uhg7N[3
return previousIndex; =GL^tAUJ
} 1$nuh@-ys
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} =p \eh?^
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抽象业务类 I^?hVH
java代码: )rbcY0q
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/** . sv
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* Created on 2005-7-12 rds0EZ4 W
*/ cdv0:+[P
package com.javaeye.common.business; ^o[(F<q
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import java.io.Serializable; p sAr>:\3
import java.util.List; _YA;Nd#%k
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import org.hibernate.Criteria; v4W<_
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import org.hibernate.HibernateException; MNH-SQB |
import org.hibernate.Session; n=%D}W
import org.hibernate.criterion.DetachedCriteria; B18?)LA
import org.hibernate.criterion.Projections; BUU ) Sz
import POb2U1Sj
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org.springframework.orm.hibernate3.HibernateCallback; tREC)+*\
import S!g0J}.z
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org.springframework.orm.hibernate3.support.HibernateDaoS L r9z~T:ED
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upport; |K'7BK_^J
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import com.javaeye.common.util.PaginationSupport; S,GM!YZg
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public abstract class AbstractManager extends X~rHNRIU
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HibernateDaoSupport { otJHcGv
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privateboolean cacheQueries = false; Ya
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privateString queryCacheRegion; ~uw eBp~O
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publicvoid setCacheQueries(boolean ]MRQcqbpqL
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cacheQueries){ M6*8}\
this.cacheQueries = cacheQueries; rE4qPzL
} -3Auo0
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publicvoid setQueryCacheRegion(String X m%aT
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queryCacheRegion){ +KHk`2{y~
this.queryCacheRegion = xi! R[xr1
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queryCacheRegion; 7w5 L?,a
} \:_!!
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publicvoid save(finalObject entity){ <'92\O
getHibernateTemplate().save(entity); K&%YTA
} 9 p`|~^X
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publicvoid persist(finalObject entity){ \++#adN:K
getHibernateTemplate().save(entity); KL+, [M@ F
} i`vgD<}
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publicvoid update(finalObject entity){ }OLBEhGs
getHibernateTemplate().update(entity); XFcIBWS
} k+As#7V
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publicvoid delete(finalObject entity){ -%g{{'9B
getHibernateTemplate().delete(entity);
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} =f-.aq(G/
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publicObject load(finalClass entity, gTqtTd~L
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finalSerializable id){ 6l?\iE
return getHibernateTemplate().load D>I|(B!.p8
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(entity, id); h&6t.2<e
} ${w\^6&
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publicObject get(finalClass entity, rQ$Jk[Y
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finalSerializable id){ .5YIf~!59
return getHibernateTemplate().get p/%B>Y>
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(entity, id); H2D j`0
} 7EukrE<b'
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publicList findAll(finalClass entity){ mp+lN:
return getHibernateTemplate().find("from 62z"cFN
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" + entity.getName()); pxO?:B
} :Y>M//0
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publicList findByNamedQuery(finalString S!wY6z
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namedQuery){ d&[.=M\E8
return getHibernateTemplate Ex3V[v+D(
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().findByNamedQuery(namedQuery); }!0nb)kL
} "N4rh<<
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publicList findByNamedQuery(finalString query, UkV{4*E
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finalObject parameter){ @Zd/>'
return getHibernateTemplate ZsikI@?
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().findByNamedQuery(query, parameter); *C n `pfO
} jM DG
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publicList findByNamedQuery(finalString query, om'DaG`A
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finalObject[] parameters){ ??.9`3CYo
return getHibernateTemplate 7Yrp#u1!
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().findByNamedQuery(query, parameters); _/zK^S)
} 'dTg\
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publicList find(finalString query){ ^6[o$eY3
return getHibernateTemplate().find qC?\i['`
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(query); 0/Wo":R:
} LVX01ox$
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publicList find(finalString query, finalObject (0/)vZc
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parameter){ V`MV_zA2
return getHibernateTemplate().find 9e:}qO5)
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(query, parameter); (1my9k5C
} Q~p[jQ,4wZ
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public PaginationSupport findPageByCriteria t6H9Q>*
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(final DetachedCriteria detachedCriteria){ 8=h$6=1S
return findPageByCriteria :Sj r
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); j.L`@
} D3+UV+&R/
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public PaginationSupport findPageByCriteria ?m$7)@p
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(final DetachedCriteria detachedCriteria, finalint ?NL>xMA
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startIndex){ }4n?k'_s?
return findPageByCriteria d\{#*{_A
@94_'i7\
(detachedCriteria, PaginationSupport.PAGESIZE,
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startIndex); _(<D*V[
} 9-9:]2~g!
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public PaginationSupport findPageByCriteria n^7$ST#'bV
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(final DetachedCriteria detachedCriteria, finalint Dx-G0 KIG
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pageSize, #' =rv
finalint startIndex){ ;|e6Qc9
return(PaginationSupport) EFgs}BV_9
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getHibernateTemplate().execute(new HibernateCallback(){ +'NiuN
publicObject doInHibernate ;i2N`t2
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(Session session)throws HibernateException { !y>MchNv
Criteria criteria = \5wC&|WEB
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detachedCriteria.getExecutableCriteria(session); |$vhu`]Z@^
int totalCount = I=,u7w`m
,DT=(
((Integer) criteria.setProjection(Projections.rowCount cQaEh1n
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()).uniqueResult()).intValue(); sH>Z{xjr
criteria.setProjection `euk&]/^.)
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(null); ms%Ot:uA
List items = o9:GKc
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criteria.setFirstResult(startIndex).setMaxResults 3??*G8Yp
om"q[Tudc
(pageSize).list(); jy]<q^J
PaginationSupport ps = YJO,"7+
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new PaginationSupport(items, totalCount, pageSize, a%-P^M;a2
psg}sl/
startIndex); 9xvE?8;M#
return ps; q1nGj
} 'ErtiD
}, true); o6$Q>g`]
} 3f{%IU(z
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public List findAllByCriteria(final 7]q$sQ
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DetachedCriteria detachedCriteria){ 4g#pQ
return(List) getHibernateTemplate oy-Qy
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().execute(new HibernateCallback(){ XB &-k<C
publicObject doInHibernate _BcYS
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(Session session)throws HibernateException { NC;4
Criteria criteria = P^%.7C
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detachedCriteria.getExecutableCriteria(session); UN&b]vg
return criteria.list(); f.gkGwNk
} 7/;Xt&
}, true); =W9;rQm
} k!]Tg"]JAh
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public int getCountByCriteria(final ]FLuiC
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DetachedCriteria detachedCriteria){ %$
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Integer count = (Integer) edPnC
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getHibernateTemplate().execute(new HibernateCallback(){ j.GpJDq
publicObject doInHibernate /tno`su;
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(Session session)throws HibernateException { Pl=X<Bp
Criteria criteria = w+cI0lj
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detachedCriteria.getExecutableCriteria(session); ^P-!pK*
return 3<x_[0v`K1
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criteria.setProjection(Projections.rowCount /q%TjQ}F
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()).uniqueResult(); K \}xb2s
} ?K7m:Dx
}, true); nTSGcMI
return count.intValue(); t_YiF%}s
}
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} ;o\0:fzr
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用户在web层构造查询条件detachedCriteria,和可选的 J#CF S G
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 au8bEw&W
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PaginationSupport的实例ps。 `SWf)1K
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ps.getItems()得到已分页好的结果集 9dw02bY`
ps.getIndexes()得到分页索引的数组 #]I:}Q51
ps.getTotalCount()得到总结果数 B$Jn|J"/6
ps.getStartIndex()当前分页索引 9VIsLk54^
ps.getNextIndex()下一页索引 ;W#G<M&n'
ps.getPreviousIndex()上一页索引 +v&+8S`+
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 NF0} eom
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 NS=puo
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一下代码重构了。 b/]C,P
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我把原本我的做法也提供出来供大家讨论吧: CQ sVGn{x
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首先,为了实现分页查询,我封装了一个Page类: 9 VkuYm,3
java代码: yq[C?N &N
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/*Created on 2005-4-14*/ @8@cpm
package org.flyware.util.page; >'Nrvy%&0
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/** +S|y)W8
* @author Joa E](Ood
* w0moC9#$?
*/ _}`iLA!$I
publicclass Page { y{K~g<VL
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/** imply if the page has previous page */ [ OMcSd|nf
privateboolean hasPrePage; 34]f[jJ|
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/** imply if the page has next page */
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privateboolean hasNextPage; Y cOtPS%
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/** the number of every page */ |!I# T
privateint everyPage; ^fS~va
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/** the total page number */ LUKdu&M
privateint totalPage; UX2`x9
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/** the number of current page */ SLz^Wg._
privateint currentPage; *8js{G0h
9+=U&*
/** the begin index of the records by the current sP5PYNspA
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query */ <+sv7"a
privateint beginIndex; 8Z/P<u
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/** The default constructor */ 5@Ot@o
public Page(){ !K(0)~u
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} hV'JTU]H
#12PO q
/** construct the page by everyPage O>|Q Zd
* @param everyPage Q?7UiTZ
* */ SMqJMirR
public Page(int everyPage){ .0.Ha}{6b
this.everyPage = everyPage; 6/s#'#jh
} R S;r
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/** The whole constructor */ hXbb+j
public Page(boolean hasPrePage, boolean hasNextPage, N$>g)Ml?
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int everyPage, int totalPage, bNY_V;7Kw`
int currentPage, int beginIndex){ f]%$HfF@
this.hasPrePage = hasPrePage; h3>/..l
this.hasNextPage = hasNextPage; '`\\O:@C`
this.everyPage = everyPage; Bz9!a k~4
this.totalPage = totalPage; GvF~h0wMt
this.currentPage = currentPage; J03yFT,dF
this.beginIndex = beginIndex; ga6M8eOI
} ui YZk3
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/** R BwI*~%g{
* @return k1_f7_m
* Returns the beginIndex. 2^Q)~sSf9
*/ DP &,jU6
publicint getBeginIndex(){ b)3dZ*cOJ
return beginIndex; [[Qu|?KEa
} =d.Z:L9d
{ >bw:^F
/** FJp~8
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* @param beginIndex d*3k]Ie%5f
* The beginIndex to set. x<~ pqq8]
*/ j2=jD G
publicvoid setBeginIndex(int beginIndex){ b,]h X
this.beginIndex = beginIndex; ^4_. 5~(
} ^6Hfq^ejt
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/** &#w]
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* @return N'i%9SBcg
* Returns the currentPage. a 5:YP
*/ o[O-|XL_
publicint getCurrentPage(){ F%+/j5~^
return currentPage; I|n<B"Q6^
} =UM30
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/** 5|9,S
* @param currentPage SLD%8:Zn
* The currentPage to set. ]xCJ3.9
*/ -s,^_p{H
publicvoid setCurrentPage(int currentPage){ !G90oW
this.currentPage = currentPage; bezT\F/\
} O3j:Y|N@F
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/** #78p#E
* @return .`)\GjDv
* Returns the everyPage. .MXznz
*/ '0p 5|[ZD
publicint getEveryPage(){ py]m^)yc
return everyPage; 9.!6wd4mw
} O1ofN#u
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/** Wr a W
* @param everyPage C;1A$]bk
* The everyPage to set. e>#*$4tg
*/ mawomna
publicvoid setEveryPage(int everyPage){ 2+s_*zM-
this.everyPage = everyPage; )~rfx
} F@& R"-
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/** q?nXhUD
* @return `{gkL-
* Returns the hasNextPage. lQ<2Vw#Yl
*/ +\fr3@Yc
publicboolean getHasNextPage(){ E5~HH($b
return hasNextPage; t>)iC)^u
} C\ZL*,%}
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/** m.iCGX
* @param hasNextPage rr>QG<i;G
* The hasNextPage to set. o8-BTq8
*/ r/$+'~apTk
publicvoid setHasNextPage(boolean hasNextPage){ .0:BgM
this.hasNextPage = hasNextPage; mSp-
} j 6%X
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/** #g#vDR!
* @return #v0"hFOH,
* Returns the hasPrePage. 2?u>A3^R
*/ AjKP -[
publicboolean getHasPrePage(){ J;W(}"cFq
return hasPrePage; x%pC.0%
} g{.>nE^Sc5
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/** `KqMcAW
* @param hasPrePage vIF=kKl9,
* The hasPrePage to set. Sf);j0G,D
*/ )@09Y_9r
publicvoid setHasPrePage(boolean hasPrePage){ X^r5su?
this.hasPrePage = hasPrePage; \V
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} p(QB 5at
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/** A[oLV"J6x5
* @return Returns the totalPage. W$B&asO
* *;"N kCf
*/ bY|%ois4
publicint getTotalPage(){ #+N\u*-S
return totalPage; bE#=\kf|
} 1t_$pDF}
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/** guz{DBlK
* @param totalPage KE1S5Mck>
* The totalPage to set. PVP,2Yq!
*/ Fq!12/Nn
publicvoid setTotalPage(int totalPage){ F1JSf&8
this.totalPage = totalPage; %Koc^
pb)
} 4:q<<vCJv
kMWu%,s4
} bj\v0NKN4
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 :@jhe8'w
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个PageUtil,负责对Page对象进行构造: LTj;e[
java代码: fu?5gzT+b
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/*Created on 2005-4-14*/ 4!p~Mr[E
package org.flyware.util.page; X0O0Y>"
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import org.apache.commons.logging.Log; !8yw!hA
import org.apache.commons.logging.LogFactory; ML'4 2z
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/** iDt^4=`
* @author Joa vDZhoD=VR
* R$'4 d
*/ m^rgzx19?
publicclass PageUtil { Y:[WwX|
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privatestaticfinal Log logger = LogFactory.getLog ePdM9%
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(PageUtil.class); W6ZXb_X
[SgWUP*
/** #qXE[%
* Use the origin page to create a new page 4r;!b;3
* @param page }M'h5x
* @param totalRecords lE:X~RO"~
* @return Xoyk 'T]-
*/ qIcQPJn!}
publicstatic Page createPage(Page page, int u.*@lGVW
j2# nCU54Z
totalRecords){ :#0uy1h
return createPage(page.getEveryPage(), u3vBMe0v[
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page.getCurrentPage(), totalRecords); ^8$CpAK]M
} ]y3V^W#
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/** pW7vY)hj
* the basic page utils not including exception K&0op 4&
[RCUP.
handler Gc>bli<-
* @param everyPage ez=$ ]cln
* @param currentPage [?x9NQ{
* @param totalRecords WLW'.
* @return page s|Ls
*/ fN~kdm.
publicstatic Page createPage(int everyPage, int Mnyg:y*=
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currentPage, int totalRecords){ %^[45e
everyPage = getEveryPage(everyPage); S>OfUrt
currentPage = getCurrentPage(currentPage); 0Ge*\Q
int beginIndex = getBeginIndex(everyPage, ((^jyQ
!|_b}/
currentPage); SQ|pH"
int totalPage = getTotalPage(everyPage, wLC!vX.S
wH=
totalRecords); 4@OnMj{M
boolean hasNextPage = hasNextPage(currentPage, G7 >
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totalPage); A!Zjcp|
boolean hasPrePage = hasPrePage(currentPage); V#[I/D
UMwB. *
returnnew Page(hasPrePage, hasNextPage, @%&;V(
everyPage, totalPage, {k] 2h4 &h
currentPage, NLFs)6\
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beginIndex); $fhrGe
} 8v@6 &ras@
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privatestaticint getEveryPage(int everyPage){ S>}jsP:V
return everyPage == 0 ? 10 : everyPage; 26JP<&%L
} 3xef>Xv=
.+>w0FG.
privatestaticint getCurrentPage(int currentPage){ :,"dno7OQ
return currentPage == 0 ? 1 : currentPage; ~ ui/Qf2|
} Mf7Q+_!
;Q&38qI
privatestaticint getBeginIndex(int everyPage, int <GPL8D
$V-]DD%Y
currentPage){ sv\'XarM
return(currentPage - 1) * everyPage; BM=`zGh"
} `?LQd2p
ta"/R@ k*
privatestaticint getTotalPage(int everyPage, int SY|r'8Z%Q
qJ|ByZ.N+
totalRecords){ [1B F8:
int totalPage = 0; J9S9rir&
W"S,~y
if(totalRecords % everyPage == 0) &[,g`S0
totalPage = totalRecords / everyPage; )V~Fl$A
else ;~T)pG8IS
totalPage = totalRecords / everyPage + 1 ; j}XTa[
6g4CUP'Y
return totalPage; q9o =,[
} Onb*nm
?xh_qy;
privatestaticboolean hasPrePage(int currentPage){ ,6Sa
return currentPage == 1 ? false : true; ^_6%dKLK
} B%gk[!d}8
='u'/g$'&
privatestaticboolean hasNextPage(int currentPage, ha
Je_Hj9#M\d
int totalPage){ +#8?y
5~q
return currentPage == totalPage || totalPage == QwXM<qG*
Hn)K;?H4
0 ? false : true; c:I1XC
} yveyAsN`B
Yf.H$L
uW%7X2K
} ;e;lPM{+
*-$u\?$
hj64ES#x
u^a\02aV[
cw.Uy(ks|$
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。 ?GqFtNz
uA=6 HpDB
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 oc'#sE
HRIf)n&~f
做法如下: *V#v6r7<Y/
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 UXD?gK1
7Z5,(dH>
的信息,和一个结果集List: Ht+ng
java代码: qY\zZ
(y|{^@
@z"Zj 3ti
/*Created on 2005-6-13*/ ^ L'8:
package com.adt.bo; K+2bNKZ0
Pc{D,/EpR
import java.util.List; lMAmico
!jY/}M~F1
import org.flyware.util.page.Page; +4\JY"oi
*LcLYxWo
/** zr@Bf!VG:
* @author Joa 'KpCPOhfR
*/ D *W+0
publicclass Result { dvxD{UH
/-z_"G
private Page page; !_E E|#`n
EA7]o.Nm*{
private List content; wOE_2k
6;Cr92
/** L`FsK64@
* The default constructor FW#Lf]FJ
*/ -aG( Yx
public Result(){
/ :"%m:-P
super(); Ek_k_!
} Djx9TBZ5
OP
|{R7uC
/** u~<>jAy
* The constructor using fields HP|,AmVLl
* j{VxB
* @param page Uo(\1&?
* @param content "Nd$sZk=
*/ R4!qm0Cd
public Result(Page page, List content){ 9F0B-aZ
this.page = page; n4YEu\*
this.content = content; ^T'+dGU`
} M_MiY|%V/K
^i&Qr+v
/** .6!]RA5!=
* @return Returns the content. J&^r}6D
*/ 1w+OnJI?
publicList getContent(){ JeMhiY}
return content; ,iCd6M{
} ']$ttfJB
<9-tA\`8N
/** 3Zsqx=w
* @return Returns the page. m#,
F%s
*/ _jH1Mcq
public Page getPage(){ g-mK(kY4p
return page; mDipP
} RTA9CR)JP4
H;*:XLPF
/** !IoD";Oi
* @param content ':[+UUC@
* The content to set. WP32t@
*/ `@ qSDW!b
public void setContent(List content){ )ty
*_@N0
this.content = content; +<:p`%
} 6BW-AZc
r d]HoFE
/** .)|jBC8|}
* @param page _kH#{4`Hw
* The page to set. la)f\Nk
*/ \_@u"+,$W
publicvoid setPage(Page page){ &IT'%*Y:V
this.page = page; aEXV^5;,pJ
} \#tr4g~u
} 9foQ0#R
g%j z,|
s`C#=l4
dp)lHBV
)~d2`1zGS
2. 编写业务逻辑接口,并实现它(UserManager, /qI80KVnN
p: sn>Y
UserManagerImpl) ;oh88,*'
java代码: Q
C~~
<n }=zu
":]O3 D{r
/*Created on 2005-7-15*/ rorzxp{
package com.adt.service; z &<Rx[
P_-zkw
import net.sf.hibernate.HibernateException; +hjc~|RK
V$q%=Sip
import org.flyware.util.page.Page; Vz 5:73
1b6gTfU
import com.adt.bo.Result; xO1d^{~^^
pe,c
/** !}1n?~]`
* @author Joa wO8^|Yf
*/ ?N11R?8
publicinterface UserManager { %Pa-fee
d/t'N-m
public Result listUser(Page page)throws bL0+v@(r
&~E=T3
HibernateException; 3M1(an\nW
k[v n:
} SI;G|uO;/
2"__jp:(
=PZs'K
/E]4N=T
U#F(#3/
java代码: 1>1|>%
`M7){
(Nik(Oyj"
/*Created on 2005-7-15*/ `gss(o1}
package com.adt.service.impl; PA5g]Tz
YRYrR|I
import java.util.List; |LNXu
xE6y9"}!h
import net.sf.hibernate.HibernateException; J25>t^
p:4vjh=1h
import org.flyware.util.page.Page; Tu6he8Q-
import org.flyware.util.page.PageUtil; O-y"]Wrv
qQ1m5_OD`z
import com.adt.bo.Result; *Lh0E/5
import com.adt.dao.UserDAO; a:;*"p[R
import com.adt.exception.ObjectNotFoundException; Q z/pz_}
import com.adt.service.UserManager; gj'ar
T8Khm O
/** 9J|YP}%
* @author Joa F~DG:x~
*/ r+lY9l
publicclass UserManagerImpl implements UserManager { Vy/g;ZPU1
_nRshTt`V&
private UserDAO userDAO; M>]%Iu
\JyWKET::_
/** T\WNT#My
* @param userDAO The userDAO to set. #qn)Nq(
*/ F)%; gzs
publicvoid setUserDAO(UserDAO userDAO){ u>(Q& 25
this.userDAO = userDAO; ,\qo
} 6Nl$&jL
<wSmfg,yF
/* (non-Javadoc) jOuv\$
* @see com.adt.service.UserManager#listUser Y3Qq'FN!I
.(Pe1pe
(org.flyware.util.page.Page) vEgJmHv;
*/ J}YI-t
public Result listUser(Page page)throws E""/dC:B
BF_k~
HibernateException, ObjectNotFoundException { JPpYT~4
int totalRecords = userDAO.getUserCount(); z%AIv%
if(totalRecords == 0) J%A`M\
throw new ObjectNotFoundException 9iOlR=-*
L;`4"
("userNotExist"); H?~u%b@
page = PageUtil.createPage(page, totalRecords); tL).f:?
List users = userDAO.getUserByPage(page); '|q:h
returnnew Result(page, users); S m1bDa\!=
} DRzpV6s
CTI(Kh+
}
K8+b\k4E
wM yPR_
n$Pv2qw
JRiuU:=J~`
\W\6m0-x
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 8bysg9H0
}3*h`(Bv7
询,接下来编写UserDAO的代码: .*f;v4!
3. UserDAO 和 UserDAOImpl: >3kR~:;
java代码: 3@&H)fdp6a
q#778
pvM8PlYo]`
/*Created on 2005-7-15*/ 000$ZsW?
package com.adt.dao; H@3+K$|v
#0P<#S^7
import java.util.List; .kYzB.3@]
?ykZY0{B
import org.flyware.util.page.Page; zbi
lt$797
import net.sf.hibernate.HibernateException; c,-x}i0c
'LOqGpmVc
/** jK=*~I
* @author Joa (G"qIw
*/ *c%@f<R~
publicinterface UserDAO extends BaseDAO { _F*w
,b$8
(gf\VYM-7
publicList getUserByName(String name)throws f|G7L5-
%%Kg'{-:
HibernateException; Ly<;x^D
nn
publicint getUserCount()throws HibernateException; x2B"%3th0
X @Bpjg
publicList getUserByPage(Page page)throws Dsua13 hF
ZB2'm3'bh
HibernateException; 3D.S[^s*
aK>9:{]ez
} ]T l\9we
nSow$6T_
^kD?0Fm
^VIUXa
O1ha'@qID
java代码: M+E5PZ|_
&Kve vPF
wW<"l"x,
/*Created on 2005-7-15*/ "^=[*i
package com.adt.dao.impl; 9e)+<H
0;H6b=
import java.util.List; t?
A4xk
y;Zfz~z
import org.flyware.util.page.Page; 7gMtnwT
KVcZ@0[S
import net.sf.hibernate.HibernateException; CU;nrd "
import net.sf.hibernate.Query; X@:fW @
/T(\}Z
import com.adt.dao.UserDAO; g"&bX4uD)
?|7+cz$g
/** &v-V_.0(H
* @author Joa ,1[??Y
*/ XH *tChf<
public class UserDAOImpl extends BaseDAOHibernateImpl D+)=bPMe
%1@<),
implements UserDAO { lp}WB d+
SN{*:\>,
/* (non-Javadoc) 5An0DV5
* @see com.adt.dao.UserDAO#getUserByName N
Sh.g#
H/3Zdj 9
(java.lang.String) \zI&n &T
*/ DqMK[N,0
publicList getUserByName(String name)throws P{Z71a5
a!:8`X~[/$
HibernateException { WDGGT.h G
String querySentence = "FROM user in class z^/ GTY
]Z-oUO
Z<k
com.adt.po.User WHERE user.name=:name"; 0GYEt
Query query = getSession().createQuery "k<:a2R
1(i>Vt.+
(querySentence); ,/:a77
query.setParameter("name", name); &7T
H
V
return query.list(); fBgKX?Y
} 4LEE
/
NN 6KLbC(
/* (non-Javadoc) :2pBv#\"qk
* @see com.adt.dao.UserDAO#getUserCount() p},Fwbl
*/ .G_3blE;
publicint getUserCount()throws HibernateException { M#cr*%
int count = 0; p}A4K#G
String querySentence = "SELECT count(*) FROM (<3lo
ZaX
unnx#e]
user in class com.adt.po.User"; V*zz-
2_i
Query query = getSession().createQuery H 1D;:n
~snF20
(querySentence); PS(j)I3
count = ((Integer)query.iterate().next -?nT mzRc
&fSc{/
()).intValue(); E)O|16f|>
return count; K)`:v|d
} }#G"!/ZA0:
_Hu2[lV
/* (non-Javadoc) bjBeiKH
* @see com.adt.dao.UserDAO#getUserByPage x"8ey|@&,
pfZ,t<bE2
(org.flyware.util.page.Page) 7vaN&%;E%
*/ NceB'YG|
publicList getUserByPage(Page page)throws t/*K#]26
E^ok`wfO
HibernateException { 8RAeJ~e
String querySentence = "FROM user in class 8M|)ojH
f4k5R
com.adt.po.User"; ;(Xe@OtW
Query query = getSession().createQuery "'!%};
Dw`m>'J0
(querySentence); zg7l>9Sc
query.setFirstResult(page.getBeginIndex()) 'n[+r}3
.setMaxResults(page.getEveryPage()); +qUkMx
return query.list(); J`q}Ry;
} Yv>BOK
2]} Uov
} akhL\-d)al
%L
j0
%x6Ov\s2
E ;!<Z4
*?bk?*?s
至此,一个完整的分页程序完成。前台的只需要调用 =kb6xmB^t
#t@x6Vt
userManager.listUser(page)即可得到一个Page对象和结果集对象 hOB\n!
eky(;%Sz
的综合体,而传入的参数page对象则可以由前台传入,如果用 r)p2'+}pV
28R>>C=R
webwork,甚至可以直接在配置文件中指定。 'xbERu(Y
A6N~UV*_
下面给出一个webwork调用示例: AzW7tp;t=
java代码: qEJ8o.D-=
adI!W-/R:
$%
Ci8p
/*Created on 2005-6-17*/ qo6LC >Qg
package com.adt.action.user; >&;>PZBPCO
TH>?Gi)"
import java.util.List; o8'Mks
V5O=iMP
import org.apache.commons.logging.Log; ySQ-!fQnP
import org.apache.commons.logging.LogFactory; fJWxJSdi
import org.flyware.util.page.Page; }r}RRd
*`ZB+ \*
import com.adt.bo.Result; #*$_S@
import com.adt.service.UserService; nuSN)}b<Q
import com.opensymphony.xwork.Action; JOrELrMx
5@czK*5
/** )@]6=*%
* @author Joa 5fu+rU-#
*/ ,\lYPx\P[
publicclass ListUser implementsAction{ %o@['9U[j
1l+kO,X]
privatestaticfinal Log logger = LogFactory.getLog 5L-lpT8P
[0u.}c;(
(ListUser.class); .Iwur;/\
.?rbny
private UserService userService; _ }E-~I>
%j'G.*TD
private Page page; #2PrGz]
h
`\$sT!Z
privateList users; nn @^K6
!%c{+]g
/* K`QOU-M@}
* (non-Javadoc) NoCDY2 $
* R9Sf!LR
* @see com.opensymphony.xwork.Action#execute() ?P""KVpo
*/ Zc'|!pT _
publicString execute()throwsException{ 'tb(J3ZP
Result result = userService.listUser(page); +0XL5('2
page = result.getPage(); =db'#m{$
users = result.getContent(); I@0z/4H``
return SUCCESS; ?a5h iN0
} H2qf'
iHAU|`'N)
/** J~Cc9"(
* @return Returns the page. E/mubA(&
*/ ? YF${
public Page getPage(){ 3CR@'
qG-
return page; ;,1=zhKU.
} lPM3}52Xu
{=UFk-$=
/** h+,'B&=|_
* @return Returns the users. b4>``n
*/ C:`;d&d
publicList getUsers(){ 'yp>L|
return users; ))7LE|1l
} eV"!/A2:N5
I eG=J4:*
/** yND"bF9
* @param page %35L=d[
* The page to set. '_:(oAi,C
*/ B*\$
/bk,
publicvoid setPage(Page page){ 1T ( u
this.page = page; Kv(z4 z
} %*wzO9w4
`79[+0hL'
/**
\K}-I
* @param users d1v<DU>M
* The users to set. ~C&*.ZR
*/ 9O;cJ)tXY
publicvoid setUsers(List users){ qG<7hr@x]
this.users = users; GCDwWCxh
} Sw~(uH_l
^ eQFg>
/** $
+;+:K
* @param userService /;?M?o"H
* The userService to set. Xka<I3UD5
*/ kv6Cp0uFg
publicvoid setUserService(UserService userService){ >F1G!#$0
this.userService = userService; ~h-C&G,v
} Nln`fE/Ht
} Cyq?5\ a
&FSmqE;@^
"~F3*lk#E
<5S@ORN
k<a;[_S
上面的代码似乎看不出什么地方设置了page的相关初值,事实上, tz26=8
Ck\7F?S
可以通过配置文件来进行配置,例如,我想每页显示10条记录,那 RK[D_SmS
e}'gvm
么只需要: ohUdGO[/
java代码: :ygWNK[6D
>ys[I0bo
x2co>.i
<?xml version="1.0"?> 7BR8/4gcPu
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork cHx%Nd\
JK]R*!{n
1.0//EN" "http://www.opensymphony.com/xwork/xwork- ~C-,G"zw&G
-KH)J
1.0.dtd"> b_TS<,
98RKCc9h
<xwork> ~@T<gA9V
c.AYxI"
<package name="user" extends="webwork- ~vHk&r]|
F.tfgW(A@
interceptors"> mpgO s
w~z[wm Okp
<!-- The default interceptor stack name #2RiLht
/kgeV4]zR
--> !gF9k8\Yr$
<default-interceptor-ref :4:N f
F>zl9Vi<
name="myDefaultWebStack"/> rYY$wA@
LCs__.
<action name="listUser" <A>)[u
8"%RCE
class="com.adt.action.user.ListUser"> !d,8kG
<param Qck|#tc
u7fK1 ^O
name="page.everyPage">10</param> S${Zzt"
<result V8WFQdXc
uI~s8{0T6
name="success">/user/user_list.jsp</result> )[L^Dmd,
</action> 20b<68h$:
Fk"Ee&H)(
</package> ljC(L/I
eSEq{?>
</xwork> FdzNE
n(1')?"mA
VA] e
1TS0X:TCn
jCioE
Bj Wr5SJ
这样就可以通过配置文件和OGNL的共同作用来对page对象设置初值 (Glr\q]jF\
=w$tvo/
了。并可以通过随意修改配置文件来修改每页需要显示的记录数。 26 I
foRD{Hx
注:上面的<param>的配置,还需要webwork和Spring整合的配合。 Os&n
Su8|R"qU
J-xS:Ha'l
yF13Of^l./
:O-iykXyI
我写的一个用于分页的类,用了泛型了,hoho WOLuw%
:i~W
}r
java代码: 2f>PO +4S{
>&,[H:Z
,](:<A)W&
package com.intokr.util; (#D*Pl
OFk8 >"|
import java.util.List; ?S
Z1`.S
q%(EYM5Y
/** dY7'OAUyVl
* 用于分页的类<br> )+P]Vf\jH
* 可以用于传递查询的结果也可以用于传送查询的参数<br> |4(~%| 8{
* NTo!'p:s
* @version 0.01 vb
Y3;+M>
* @author cheng {ZU1x C
*/ .zg8i_
public class Paginator<E> { \OILWQ[/
privateint count = 0; // 总记录数 S4UM|`
privateint p = 1; // 页编号 t5B7I59
privateint num = 20; // 每页的记录数 80b;I|-T,
privateList<E> results = null; // 结果 O.G'?m<:#
O.`Jl%
/** h!rM^
* 结果总数 +Y"r71|A6+
*/ q h/F
publicint getCount(){ _"@CGXu
return count; ` x8J
} xu5ia|gYz7
NLS"eDm
publicvoid setCount(int count){ fKH7xu!V4+
this.count = count; \Ig68dFf%
} K5Q43e1
bmgn cwlz
/** $+JS&k/'m
* 本结果所在的页码,从1开始 {n#k,b&9B
* E>b2+;Jv
* @return Returns the pageNo. 9,uhfb^]
*/ W%<LTWOc
publicint getP(){ 2. G=8:l
return p; b-ll
} {S/yL[S.
6!x&LoM
/** sUZX
}
* if(p<=0) p=1 `Z:R Ce^
* N6K*d` o
* @param p Hnknly
*/ <8,o50`B
publicvoid setP(int p){ ~h}Fi
if(p <= 0) IV%zO+
p = 1; SIO&rrT.
this.p = p; 7tUA>;++
} +#U|skl
dr)YzOvba
/** 6+r$t#
* 每页记录数量 Zl 9aDg
*/ pl@O
N"=[
publicint getNum(){ ,B?~-2cCz
return num; OsBo+fwT
} <,o>Wx*1C
W} WI; cI
/** A.<H>=Z#O
* if(num<1) num=1 H]Hv;fcC
*/ vEf4HZ&w
publicvoid setNum(int num){ \(226^|j
if(num < 1) 8fA_p}wp
num = 1; {{V8;y
this.num = num; !cKz7?w
} =qN2Xg/
rpeJkG@+
/** Uc/+gz
Z;
* 获得总页数 #/PA A
*/ DPi_O{W>
publicint getPageNum(){ !.2<| 24
return(count - 1) / num + 1; 8.F~k~srA
} F,
U*yj
SGb;!T*
/** =*p/F
* 获得本页的开始编号,为 (p-1)*num+1 *8~86u GU
*/ (c0A.L)
publicint getStart(){ ;iDPn2?6?x
return(p - 1) * num + 1; :#dE:L;T
} 2,ECYie^
)`^p%k
/** 6'\6OsH
* @return Returns the results. dJ"iEb|4
*/ hW{j\@R
publicList<E> getResults(){ *s@Qtgu
return results; U
qG
.:@T
} {vAE:W.s
$w"$r$K9K
public void setResults(List<E> results){ /cc\fw1+
this.results = results; o7IxJCL=Q
} *~w[eH!!
]HpA5q1ck
public String toString(){ ~?B;!Csk
StringBuilder buff = new StringBuilder 'SQG>F Uy
,{\Bze1fn
(); SG6sw]x
buff.append("{"); j*~T1i
buff.append("count:").append(count); ySI~{YVM
buff.append(",p:").append(p); =zwOq(Bh W
buff.append(",nump:").append(num); ~]ZpA-*@Ut
buff.append(",results:").append N !TW!
MZmb`%BZ
(results); d)~Fmi;
buff.append("}"); qI^
/"k*5
return buff.toString(); n3J53| %v
} cwGbSW$t
t&?im<
} ^>"z@$|\:
qzb<J=FAU
DTWD|M