Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 #F >R5 D
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]OA8H[U-eA
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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 %wux#"8
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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 .\ces2,
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分页支持类: q6>%1~?
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java代码: 6M_,4>
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package com.javaeye.common.util; +dSO?Y]
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import java.util.List; L Z#SX5N
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publicclass PaginationSupport { 0=KyupwXC
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publicfinalstaticint PAGESIZE = 30; 0)-yLfTn
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privateint pageSize = PAGESIZE; ZncJ
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privateList items; /aD3E"Op
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privateint totalCount; PPSSar
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privateint[] indexes = newint[0]; -|A`+1-R+
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privateint startIndex = 0; q'[q]
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public PaginationSupport(List items, int ?T <2Cl'C
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totalCount){ dBMr%6tz
setPageSize(PAGESIZE); r5g:#mF"
setTotalCount(totalCount); #Rcb
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setItems(items); N3g\X
setStartIndex(0); 5ki<1{aVtZ
} KI{B<S3*Z
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public PaginationSupport(List items, int +&h<:/ V
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totalCount, int startIndex){ P<A_7Ho
setPageSize(PAGESIZE); 2^$Ha|
setTotalCount(totalCount); `8D}\w<eI
setItems(items); &;Jg2f%.
setStartIndex(startIndex); <^8&2wAkJ
} GY,HEe]2r
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public PaginationSupport(List items, int Sr?2~R0&
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totalCount, int pageSize, int startIndex){ ev;R; 0<
setPageSize(pageSize); (^).$g5Hg
setTotalCount(totalCount); e$ {Cf
setItems(items); ii:E>O(0B
setStartIndex(startIndex); G :JQ_w
} Dq G m
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publicList getItems(){ %qqX-SF0C
return items; (TJ )Y7E
} dGY:?mf&
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publicvoid setItems(List items){ a08`h.dyN
this.items = items; V 0M&D,
} 2/m4|
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publicint getPageSize(){ (B:+md\Q
return pageSize; ^>ICycJ
} sw^4h`^'
9#X"m,SB
publicvoid setPageSize(int pageSize){ 7I`8r2H
this.pageSize = pageSize; {N2MskK
} 84}Pu%
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publicint getTotalCount(){ \&Zp/;n
return totalCount; T@)|0M
} Qaeg3f3F3
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publicvoid setTotalCount(int totalCount){ kI|7o>}<
if(totalCount > 0){ /pS Y ~*
this.totalCount = totalCount; Qt`;+N(
int count = totalCount / `!A<XiAOmM
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pageSize; >j$y@"+
if(totalCount % pageSize > 0) "|KhqV=?v
count++; m#.N
indexes = newint[count]; iu+r=sp
for(int i = 0; i < count; i++){ z+(V2?xcvt
indexes = pageSize * MGU%"7i'}
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} +9!=pRq
}else{ 'NYW`,
this.totalCount = 0; j}fu|-
} 9H#;i]t &
} J':x]_;
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publicint[] getIndexes(){ 3yw`%$d5
return indexes; t#BQB<GI
} zD,K_HicI
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publicvoid setIndexes(int[] indexes){ ]u<8jr
this.indexes = indexes; )~[rb<:)b
} V|W[>/
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publicint getStartIndex(){ `+0K~k|DC
return startIndex; EYXHxo
} Yw_^]:~
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publicvoid setStartIndex(int startIndex){ !/RL.`!>
if(totalCount <= 0) `ZhS=ezgr
this.startIndex = 0; aF]cEe
elseif(startIndex >= totalCount) k(23Zt]
this.startIndex = indexes &6q67
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[indexes.length - 1]; I92orr1
elseif(startIndex < 0) p38RgEf
this.startIndex = 0; UsQh+W"?
else{ UrJrvx
this.startIndex = indexes PyQ
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[startIndex / pageSize]; 0n-S%e5
} >,}SP;
} &\>. j|
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publicint getNextIndex(){ DICS6VG}
int nextIndex = getStartIndex() + 5|_El/G
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pageSize; 3EO:Uk5<
if(nextIndex >= totalCount) "p\5:<
return getStartIndex(); tx_h1[qi
else w6&p4Jw/H?
return nextIndex; C=,O'U(ep
} m[8?d~
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publicint getPreviousIndex(){ (F=q/lK$
int previousIndex = getStartIndex() - *pj^d><
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pageSize; w gU2q|
if(previousIndex < 0) XkRPD
return0; Bh
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else EaN1xb(DYa
return previousIndex; h}&1
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} Ce`#J6lT
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} )y"8Bx=x4
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抽象业务类 O0RV>Ml'&
java代码: .{,fb
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/** `PS^o#
* Created on 2005-7-12 v4Mn@e_#c
*/ `RHhc{
package com.javaeye.common.business; C7Ny-rj}IA
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import java.io.Serializable; #fT<]j(
import java.util.List; zTS P8Q7
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import org.hibernate.Criteria; CX3yIe~u
import org.hibernate.HibernateException; oxZXY]$y
import org.hibernate.Session; kG>m(n
import org.hibernate.criterion.DetachedCriteria; wrm
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import org.hibernate.criterion.Projections; W'" p:Uhq
import B0$ge"FK9
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org.springframework.orm.hibernate3.HibernateCallback; @ebSM#F?
import uq\[^
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org.springframework.orm.hibernate3.support.HibernateDaoS &e)V!o@wJV
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upport; '
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import com.javaeye.common.util.PaginationSupport; O/Mx$Q3re
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public abstract class AbstractManager extends R
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HibernateDaoSupport { ^^(!>n6r^
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privateboolean cacheQueries = false; Xv2Q8-}w
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privateString queryCacheRegion; +nz0ZQ9 a
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publicvoid setCacheQueries(boolean ~%?LFR'
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cacheQueries){ lQKq{WLFx.
this.cacheQueries = cacheQueries; WY$c^av<
} h[>Puoz
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publicvoid setQueryCacheRegion(String <`")Zxf+
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queryCacheRegion){ #u/5
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this.queryCacheRegion = oef]
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queryCacheRegion; R
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} H6Q!~o\"H
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publicvoid save(finalObject entity){ K9QC$b9(
getHibernateTemplate().save(entity); S+7u,%n/
} Z3 O_K
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publicvoid persist(finalObject entity){ i%n9RuULh
getHibernateTemplate().save(entity); |31/*J!@z*
} UH`cWV Lpr
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publicvoid update(finalObject entity){ %`\=qSf*
getHibernateTemplate().update(entity); w=kW~gg
} cceh`s=cU
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publicvoid delete(finalObject entity){ QC<O=<$Q[
getHibernateTemplate().delete(entity); C Xh>'K
} w`X0^<Fv
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publicObject load(finalClass entity, L "5;<
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finalSerializable id){ qZYh^\
return getHibernateTemplate().load a\*_b2 ^n
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(entity, id); x:iLBYf
} 1 Szv4
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publicObject get(finalClass entity, guk{3<d:Jy
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finalSerializable id){ ZZrvl4h
return getHibernateTemplate().get ~S~4pK
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(entity, id); S!8q>d,%L
} !SdP<{[
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publicList findAll(finalClass entity){ #n.XOet<\
return getHibernateTemplate().find("from ",pd 9
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" + entity.getName()); Y3g<%6
} |h-e+Wh1
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publicList findByNamedQuery(finalString 8fA8@O}
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namedQuery){
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return getHibernateTemplate $fAZ^
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().findByNamedQuery(namedQuery); k-I U}|Xz
} \[<8AV"E-'
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publicList findByNamedQuery(finalString query, h3j`X'
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finalObject parameter){ r<!/!}fE,
return getHibernateTemplate zxC~a97`
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().findByNamedQuery(query, parameter); OZ4% 6/
} 51 "v`O+
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publicList findByNamedQuery(finalString query, ;N^4R$Q.
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finalObject[] parameters){ g9AA)Ykp
return getHibernateTemplate B4{F)Zb
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().findByNamedQuery(query, parameters);
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} h@ @q:I=
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publicList find(finalString query){ rO]2we/B,4
return getHibernateTemplate().find " nLWvV1
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(query); AA5UOg\jI
} Bpp(5
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publicList find(finalString query, finalObject 4F,RlKHBl
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parameter){ nU/x,W[}
return getHibernateTemplate().find rw%OA4>
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(query, parameter); grE'ySX0
} Ygc.0VKMR
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public PaginationSupport findPageByCriteria Q1RUmIe_&
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(final DetachedCriteria detachedCriteria){ ;!B>b)%
return findPageByCriteria 2#@-t{\3-p
3j\Py'};
(detachedCriteria, PaginationSupport.PAGESIZE, 0); /! M%9gu
} uOJso2Mx
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public PaginationSupport findPageByCriteria D
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(final DetachedCriteria detachedCriteria, finalint Q&vU|y
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startIndex){ o$Z]qhq
return findPageByCriteria O
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(detachedCriteria, PaginationSupport.PAGESIZE, B3Ws)nF"
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startIndex); e?<$H\
} &XB1=b5
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public PaginationSupport findPageByCriteria lh-zE5;
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(final DetachedCriteria detachedCriteria, finalint G& @_,y|
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pageSize, R]N"P:wf@
finalint startIndex){ Lv@'v4.({
return(PaginationSupport) {;3a^K
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getHibernateTemplate().execute(new HibernateCallback(){ !-tVt
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publicObject doInHibernate K}QZdN']
@gi / 1 cq
(Session session)throws HibernateException { 6JD~G\$
Criteria criteria = +K48c,gt?
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detachedCriteria.getExecutableCriteria(session); %D>cY!
int totalCount = /\m>PcPa
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((Integer) criteria.setProjection(Projections.rowCount j9|1G-CM
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()).uniqueResult()).intValue(); Bs\&'=l
criteria.setProjection e\! ic
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(null); !wIrI/P7#
List items = C,,S<=L:
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criteria.setFirstResult(startIndex).setMaxResults 7*@BCu6
i .''\
(pageSize).list(); I]Vkaf I>(
PaginationSupport ps = _@O.EksY3r
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new PaginationSupport(items, totalCount, pageSize, \'+P5,
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startIndex); Q$x
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return ps; Nx<fj=VJ
} -~]]%VJP|
}, true); ):nC&M\W~
} k.wm{d]J
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public List findAllByCriteria(final R@2*Lgxz~
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DetachedCriteria detachedCriteria){ afye$$X
return(List) getHibernateTemplate (
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().execute(new HibernateCallback(){ l:j>d^V*&x
publicObject doInHibernate B1 xlWdm
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(Session session)throws HibernateException { dyt.(2
Criteria criteria = ]>,Lw=_[_
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detachedCriteria.getExecutableCriteria(session); trlZ
return criteria.list(); Cg]S`R-
} v(^;%
}, true); b\C1qM4
} 4GexYDk'#
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public int getCountByCriteria(final #./8inbG
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DetachedCriteria detachedCriteria){
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Integer count = (Integer) b#Vm;6BHD1
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getHibernateTemplate().execute(new HibernateCallback(){ uk)D2.eS,
publicObject doInHibernate Ns.{$'ll
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(Session session)throws HibernateException { c4M]q4]F
Criteria criteria = Ee'wsL
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detachedCriteria.getExecutableCriteria(session); W=2#Q2)
return v+
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criteria.setProjection(Projections.rowCount z/|tsVK
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()).uniqueResult(); kV$VKag*A
} DhT8Kh{
}, true); #<yKG \X?
return count.intValue(); jNW/Biy4u
} TlJ'pG 4^
} yOyuMZo6
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用户在web层构造查询条件detachedCriteria,和可选的 o_PQ]1
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 :{~TG]4M
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PaginationSupport的实例ps。 tFX!s;N[
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ps.getItems()得到已分页好的结果集 X,`e1nsR
ps.getIndexes()得到分页索引的数组 O:+?:aI@
ps.getTotalCount()得到总结果数 cT#R B7
ps.getStartIndex()当前分页索引 1qh SN#s{_
ps.getNextIndex()下一页索引 q[%SF=~<k{
ps.getPreviousIndex()上一页索引 Q&e*[l2M6
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 6<9gVh<=w
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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 e%KCcU
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一下代码重构了。 5Pd^Sew
#LfoG?k1K
我把原本我的做法也提供出来供大家讨论吧: 3=IY0Q>/(
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首先,为了实现分页查询,我封装了一个Page类: W4:#=.m
java代码: !p(N
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/*Created on 2005-4-14*/ {Zf 9}
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package org.flyware.util.page; S0tPnwco[~
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/** g UA_&_
* @author Joa [u7i)fn5?
* W.TdhJW9
*/ Kl w9
publicclass Page { 6G<gA>V
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/** imply if the page has previous page */ (r"2XXR
privateboolean hasPrePage; r*t\F&D
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/** imply if the page has next page */ '<&rMn
privateboolean hasNextPage; p-B
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{
/** the number of every page */ 2g%p9-MO]I
privateint everyPage; $
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/** the total page number */ NSQ#\:3:S
privateint totalPage; tQcn%CK
3/4r\%1b+
/** the number of current page */ <6!/B[!O=
privateint currentPage; X5c)T}pyv
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/** the begin index of the records by the current !Q5NV4gd+
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query */ _:VIlg
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privateint beginIndex; }vt>}%%
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/** The default constructor */ sjwD x0(7=
public Page(){ |Q*{yvfEo
|]j2T8_=
} CG[04y
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/** construct the page by everyPage ^THyohK
* @param everyPage `*--vSi
* */ I.u[9CI7HU
public Page(int everyPage){ NnqAr ,
this.everyPage = everyPage; &v<Am%!N
} /@+[D{_Fw
?m dGMf)
/** The whole constructor */ 5ii:93Hlj
public Page(boolean hasPrePage, boolean hasNextPage, h"On9
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int everyPage, int totalPage, mI-9=6T_
int currentPage, int beginIndex){ n@y*~sG]
this.hasPrePage = hasPrePage; }TwSSF|}3
this.hasNextPage = hasNextPage; vs(x;zpJ
this.everyPage = everyPage; Hjc *WTu
this.totalPage = totalPage; cUc:^wvLS
this.currentPage = currentPage; QZamf
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this.beginIndex = beginIndex; .?*TU~S
}
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/** ,nz3S5~
* @return L<_zQ
* Returns the beginIndex. Kp%:\s,lO
*/ Pze{5!
publicint getBeginIndex(){ 7q'T,'[
return beginIndex; 0M 5m8
} FmC
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/** Fps:6~gD
* @param beginIndex i[m-&
* The beginIndex to set. }g_\?z3gt
*/ i=X
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publicvoid setBeginIndex(int beginIndex){ ::2(pgH
this.beginIndex = beginIndex; s!WI:E7
} |!"qz$8fB
@]X5g8h
/** $gysy!2}.
* @return H:.l:PJ
* Returns the currentPage. MNd[Xzm
*/ (5Sv$Xt
publicint getCurrentPage(){ \#q|.d$u
return currentPage; CC.ri3+.
} j2Uu8.8d
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/** >^zbDU1wT
* @param currentPage d^ZrI\AJ
* The currentPage to set. = `oGH
*/ <F<jx"/)
publicvoid setCurrentPage(int currentPage){ %M
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this.currentPage = currentPage; QT7PCHP
} B dKD%CJ[
@"'$e_jj"
/** .fD%*-
* @return ZA.i\
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* Returns the everyPage. R>dd#`r"
*/ Vc$y^|=
publicint getEveryPage(){ .Fm@OQr
return everyPage; !TeI Jm/l
} R&9Q#n-
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/** ;eT+Ly|{
* @param everyPage Ff{dOV.i
* The everyPage to set. zHk7!|%Y
*/ qotWWe#
publicvoid setEveryPage(int everyPage){ $W0O
this.everyPage = everyPage; Ym$=^f]-
} y$U(oIU>
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/** ]Ofs,U^
* @return n5;>e&
* Returns the hasNextPage. #D|n6[Y'.t
*/ E>Lgf&R#W
publicboolean getHasNextPage(){ mk]8}+^.
return hasNextPage; raCgctYVq
} D%!GY1wdn
!FHm.E_>
/** Q+a"Z^Z|
* @param hasNextPage [ %6(1$Ih
* The hasNextPage to set. D2MWrX
*/ nV3I6
publicvoid setHasNextPage(boolean hasNextPage){ jCp`woV
this.hasNextPage = hasNextPage; K | '`w.
} W+u-M>Cj6
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/** IHcR/\mz
* @return Ucd~-D
* Returns the hasPrePage. z`(">J
*/ 0UOjk.~b
publicboolean getHasPrePage(){ oJe`]_XZ
return hasPrePage; i:\|G^h
} aDZ] {;
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/** 2i)vT)~
* @param hasPrePage h@%a+ 6b?
* The hasPrePage to set. I@q(P>]X9
*/ @~8*
publicvoid setHasPrePage(boolean hasPrePage){ 5dkXDta[G
this.hasPrePage = hasPrePage; XN}^:j_2
} vXT>Dc2\!
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/** |VQmB/a
* @return Returns the totalPage. <P.'r,"[
* U*:E|'>
*/ ]'5 G/H5?;
publicint getTotalPage(){ 'ZAl7k .
return totalPage; Js/QL=,
} -T{G8@V0I
"WZ |
/** Hp5.jor(k
* @param totalPage E_T!|Q.
* The totalPage to set. @^Yr=d ba
*/ a9y+FCA
publicvoid setTotalPage(int totalPage){ t$g@+1p4
this.totalPage = totalPage; :s>x~t8g#n
} C@{-$z)
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} qrufnu5cC
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iB#*XJ;q
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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 DhD^w;f]
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个PageUtil,负责对Page对象进行构造: ^]MLEr!S
java代码: 'wni.E&
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/*Created on 2005-4-14*/ vX|5*T`(
package org.flyware.util.page; \gR%PN
v"-K-AQjB
import org.apache.commons.logging.Log; <h%I-e6
import org.apache.commons.logging.LogFactory; 0t7vg#v|
p} {H%L
/** f"SK3hI$p
* @author Joa <.hutU*1
* q![`3m-d.
*/ CaR-Yk
publicclass PageUtil { IPf>9#L
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privatestaticfinal Log logger = LogFactory.getLog V6Y0#sTU
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(PageUtil.class); lRR A2Kql
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/** vwAtX($
* Use the origin page to create a new page Q)=LbR{#
* @param page 8]Q#P
* @param totalRecords *USG
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* @return fwNj@fl_,e
*/ 0+F--E4
publicstatic Page createPage(Page page, int !<?<f
db
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totalRecords){ |enb5b78
return createPage(page.getEveryPage(), zPN:)
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page.getCurrentPage(), totalRecords); B>g(i=E
} y/+IPR
qP]1}-
/** FG^lh
* the basic page utils not including exception \/ipYc
/xj`'8
handler Xyr'rm5+b
* @param everyPage VS >xvF
* @param currentPage et?FX K"y
* @param totalRecords wf`A&P5tF
* @return page d,toU I
*/ gloJ;dEB
publicstatic Page createPage(int everyPage, int d/!\iLF
mM:%-I\$
currentPage, int totalRecords){ ;8a9S0eS
everyPage = getEveryPage(everyPage); T^vhhfCUr
currentPage = getCurrentPage(currentPage); ;GIA`=a%
int beginIndex = getBeginIndex(everyPage, w[C*w\A\M
E+lr{~
currentPage); RFoCM^
int totalPage = getTotalPage(everyPage, ?tA%A
f-p$4%(
totalRecords); m`}mbm^
boolean hasNextPage = hasNextPage(currentPage, 5Dzf[V^]`
$ ^@fV=e
totalPage); 3&mpn,
boolean hasPrePage = hasPrePage(currentPage); Ft38)T"2R\
:w+vi7l$
returnnew Page(hasPrePage, hasNextPage, fUr%@&~l^
everyPage, totalPage, w!'y,yb%
currentPage, %%NT m
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beginIndex); XJ5@/BW
} '6;
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privatestaticint getEveryPage(int everyPage){ \*[DR R0
return everyPage == 0 ? 10 : everyPage; huW,kk<]y
} hQ'W7EF
YmOj.Q&
privatestaticint getCurrentPage(int currentPage){ ea]qX6)UZ
return currentPage == 0 ? 1 : currentPage; $JUkwsc
} ja9=b?]0,
Wf^sl
privatestaticint getBeginIndex(int everyPage, int x-]:g&5T
t+_\^Oa)
currentPage){ <ZheWl
return(currentPage - 1) * everyPage; hz*T"HJ]t
} lv9Tq5C
JOJuGB-d
privatestaticint getTotalPage(int everyPage, int +(PUiiP'"v
*ow`}Q
totalRecords){ n}t9Nf_
int totalPage = 0; F]D{[dBf
>]8(3&zd
if(totalRecords % everyPage == 0) s1h|/7gG
totalPage = totalRecords / everyPage; RMiDV^.u`
else UI"UBZZ$
totalPage = totalRecords / everyPage + 1 ; 2gh=0%|\gx
_QEw=*.<
return totalPage; ;|0P\3
} >I/@GX/
;!G#Y
Oe
privatestaticboolean hasPrePage(int currentPage){ 6aOyI;Ux
return currentPage == 1 ? false : true; /QWXEL/M=
} Y[]I!Bc
:)i,K>y3i
privatestaticboolean hasNextPage(int currentPage, } C:i0Q
`hdff0
int totalPage){ 1YQYZ^11
return currentPage == totalPage || totalPage == AwjXY,2
'%wSs,HD
0 ? false : true; m#8(l{3|
} kJpO0k9?eY
Hi$R"O
(
@6|<c
} (xHu@l!]
i1XRBC9
AO>b\,0Me
U[02$gd0l
TA0(U$ 4
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。 A]TEs)#*7)
y*ZA{
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 :"MHmm=uU8
fgeh;cD
做法如下: f;Oh"Yt
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 DH%PkGn
w;yzgj:n&f
的信息,和一个结果集List: R~T}
java代码: yvj /u
c
<g%A2lI
Ln2FG4{
/*Created on 2005-6-13*/ jLM([t
package com.adt.bo; l)*(UZ"
&R?`QB2/
import java.util.List; l cHf\~
ZnRT$ l O
import org.flyware.util.page.Page;
*Z^`H!&
A&)2m
/** }oA>0Nw$K
* @author Joa ) WbWp4
*/ C1e@{>
publicclass Result { ]95VMyN
`BK b60
private Page page; ;cvMNU$fN
| bRU=dg
private List content; [K$5Rm5
$8rnf
/** IH dA2d?.]
* The default constructor ,|s*g'u
*/ A5J41yH
public Result(){ E I(e3
super(); &>C+5`bg
} "WuUMt
mjWU0.
/** Y|Q(JX
* The constructor using fields E`I(x&_
* n)"JMzjQ<
* @param page -f&vH_eK
* @param content !5(DU~S*@S
*/ 4pf@.ra,
public Result(Page page, List content){
,AweHUEn
this.page = page; d}zh.O5P!
this.content = content; ^n0;Q$\
} <O
0Q]`i
Rlk3AWl2u
/** Ba8=nGa4KY
* @return Returns the content. Q&xH
*/ c>K]$;}
publicList getContent(){ E&zf<Y
return content; #jW -&a
} PXYLLX\3
sWte&
/** Z::I3 Q
* @return Returns the page. O&BvWik
*/ fMg9h9U
public Page getPage(){ dh7`eAMY
return page; +4_, , I
} =Q40]>bpx
M%`CzCL
u
/** /HLI9
* @param content sFz0:SqhE
* The content to set. 3?a`@C&x
*/ HTT&T9]
public void setContent(List content){ dhob]8b
this.content = content; IZj`*M%3
} olv?$]
p"p~Bx
/** a%B&F|u
* @param page '~&W'='b;
* The page to set. @6yc^DAA
*/ ;6P>S4`w
publicvoid setPage(Page page){ hg" i;I
this.page = page; Pgr2S I
} (T#$0RFq
} qisvGHo
AJ7^'p9Y
xyL)'C
B#S8j18M
h'-4nu;*
2. 编写业务逻辑接口,并实现它(UserManager, 8C@u+tx
/S]RP>cQ
UserManagerImpl) H%@f ^
java代码: B1)Eo2i#
e9{0hw7
!92e$GJ} ;
/*Created on 2005-7-15*/ PiKP.
package com.adt.service; 1OMXg=Y
j+gxn_E
import net.sf.hibernate.HibernateException; lf7bx}P*
Sc[#]2 }
import org.flyware.util.page.Page; s)]j X
I;t@wbY,
import com.adt.bo.Result; tJ6@Ot
J;>epM;*
/** CVa>5vt
* @author Joa d#0:U
Y% ~
*/ z9ADF(J?0'
publicinterface UserManager { ]@Zv94Z(
kP%hgZ
public Result listUser(Page page)throws UA8hYWRP
losqc *|
HibernateException; [
@eA o>
P 0.cF]<m
} 7?=^0?a
XG.[C>
V+"%BrM
'%rT]u3U
p3U)J&]c6
java代码: 9-c3@>v
8<C*D".T$
VhkM{O
/*Created on 2005-7-15*/ MT&aH~YB
package com.adt.service.impl; L5FOlzn
>4X2uNbZS
import java.util.List; |ky40[C
~JXz
import net.sf.hibernate.HibernateException; $CE dJ+0z
cb9-~*1
import org.flyware.util.page.Page; ?.VKVTX^
import org.flyware.util.page.PageUtil; 4[$:KGh3
T o["o!(;z
import com.adt.bo.Result; }d?;kt
import com.adt.dao.UserDAO; GJ*IH9YR
import com.adt.exception.ObjectNotFoundException; O% T?+1E
import com.adt.service.UserManager; 1<BKTMBq?{
Dds-;9
/** K'ZNIRr/C
* @author Joa !vgY3S0?rq
*/ ;0 B1P|7zK
publicclass UserManagerImpl implements UserManager { [LnPV2@e
Vn^GJ'^
private UserDAO userDAO; 0P5VbDv$r7
1c0'i
/** $yASWz
* @param userDAO The userDAO to set. f=l/Fp}4UH
*/ +^Xf:r`
G
publicvoid setUserDAO(UserDAO userDAO){ bZYayjxZ5i
this.userDAO = userDAO; ZW [&7[4
} &THtQ1D
.#QE*<T)]
/* (non-Javadoc) @A1f#Ed<
* @see com.adt.service.UserManager#listUser $t;:"i>
Hx gC*-A$/
(org.flyware.util.page.Page) s6|'s<x"j
*/
:RnUNz
public Result listUser(Page page)throws ~b~Tq
j9h/`Bn
HibernateException, ObjectNotFoundException { 0DicrnH8
int totalRecords = userDAO.getUserCount(); d{7ZO#E
if(totalRecords == 0) _aFe9+y
throw new ObjectNotFoundException {cs>Sy
4
M~2Us{ `
("userNotExist"); kg^0 %-F
page = PageUtil.createPage(page, totalRecords); S.!,qv z
List users = userDAO.getUserByPage(page); .2E/(VM
returnnew Result(page, users); 0zH-g
} R2Tt6
-MTk9<qnT
} F$as#.7FF
X
hq ss),
MI`qzC*%
w6V/Xp][U
;|Mfq`s
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 WA(x]""
y47N(;vy
询,接下来编写UserDAO的代码: \V$qAfP)
3. UserDAO 和 UserDAOImpl: \AwkK3
java代码: n2mO-ZXud
3*h"B$g!
lJdBUoO
/*Created on 2005-7-15*/ sq2:yt
package com.adt.dao; K KB+o)*W
6MVu"0#
import java.util.List; vS8&,wJ!
7% D 4
import org.flyware.util.page.Page; B"_O!
v?VDASR2`
import net.sf.hibernate.HibernateException; %'iJVFF
1#=9DD$4
/** h <4`|Bg+
* @author Joa /i,n75/y?
*/ Lu}jk
W*
publicinterface UserDAO extends BaseDAO { "QnYT3[l"
c~vhkRA
publicList getUserByName(String name)throws %hSQ\T<8[o
j,j|'7J%
HibernateException; "TA0--6
eNd&47lJ
publicint getUserCount()throws HibernateException; qzZ/%{Ak
t<UJR*R=L
publicList getUserByPage(Page page)throws nFQuoU]ux
JVIFpN" `
HibernateException; DquLr+s~
G(7%*@SX
} iO$87!
tB4mhX|\
$P{`-Y }a
"-=fi
'D
=Dq&lm,n
java代码: _qa]T'8
T[SK>z
)$!b`u
/*Created on 2005-7-15*/
5_;-Qw
package com.adt.dao.impl; kO\ O$J^S
WutPy_L<
import java.util.List; 6nL^"3@S!
9rMO=
import org.flyware.util.page.Page; 01'>[h#_n
MDlH[PJ@i
import net.sf.hibernate.HibernateException; M.Yp'Av
import net.sf.hibernate.Query; C7C4
eW8
zr|DC] 3
import com.adt.dao.UserDAO; I>;{BYPV
yJI~{VmU7
/** JdS,s5Z>
* @author Joa R;!,(l
*/ !mxH/{+|n
public class UserDAOImpl extends BaseDAOHibernateImpl BEOPZ[Q|c
O^cC+@l!4
implements UserDAO { qnp}#BZ
n<C]
6H
/* (non-Javadoc) <L]Gk]k_R
* @see com.adt.dao.UserDAO#getUserByName ?0; 2ct
R,BJr y
(java.lang.String) Z[nHo'
*/ p}QDX*/sSu
publicList getUserByName(String name)throws w1tM !4r
zP44
Xhz
HibernateException { G%I
.u
String querySentence = "FROM user in class 5mZ2CDV
TLsF c^X
com.adt.po.User WHERE user.name=:name"; {5B j*m5
Query query = getSession().createQuery |`o|;A]
bo|THS
(querySentence); LTe ({6l0
query.setParameter("name", name); gF,=rT1:>r
return query.list(); @/s|<*
} 5?^#v
r]!#v{#.
/* (non-Javadoc) k;^$Pd?t
* @see com.adt.dao.UserDAO#getUserCount() Uoe{,4T
*/ p-iFe\+
publicint getUserCount()throws HibernateException { _{jC?rzb
int count = 0; Z^> 4qf,k
String querySentence = "SELECT count(*) FROM D3C 7f'
hP)Zm%@0f
user in class com.adt.po.User"; C][$0
Query query = getSession().createQuery fB+h( 2N~
F%6wdM W
(querySentence); o-@01_j
count = ((Integer)query.iterate().next F-s{#V1=
UDJjw
()).intValue(); S($/Ov
return count; %C/p+Tg
} @%,~5{Ir
on7
n4
/* (non-Javadoc) v":q_w<k
* @see com.adt.dao.UserDAO#getUserByPage :6Nb,Hh~
1%v6d
!
(org.flyware.util.page.Page) a<&K^M&
*/ <G}Lc
publicList getUserByPage(Page page)throws RvAgv[8
or*{P=m+R
HibernateException { gHPJiiCv
String querySentence = "FROM user in class Pg8.RvmQ
4;AF\De
com.adt.po.User"; &<;T$Y
Query query = getSession().createQuery r,JQR)l0@V
/Z6lnm7wJ
(querySentence); B/;>v
query.setFirstResult(page.getBeginIndex()) *V kaFQZ$,
.setMaxResults(page.getEveryPage()); M*0^<e~]F
return query.list(); q? ">
} q5_zsUR=
:XhF:c[.:
} Es+I]o0K
(?Mn_FNE|
1L*[!QT4
]`)5 Qe4
&?R/6"J
至此,一个完整的分页程序完成。前台的只需要调用 V| V9.
rC!O}(4t%$
userManager.listUser(page)即可得到一个Page对象和结果集对象 W\~ie}D{
M)#9Q=<
的综合体,而传入的参数page对象则可以由前台传入,如果用 qob!AU|
6-|?ya
webwork,甚至可以直接在配置文件中指定。 ms0V1`
}*(_JR4G
下面给出一个webwork调用示例:
sm`c9[E
java代码: 0;l~B
h}a}HabA
mFTuqujO
/*Created on 2005-6-17*/ i F+:j8
b
package com.adt.action.user; ?xqS#^Z
!+eU
import java.util.List; !K(
m538p.(LIR
import org.apache.commons.logging.Log; $Y7VA
import org.apache.commons.logging.LogFactory; :%h1Q>F
import org.flyware.util.page.Page; Tv"T+!Z
UDI\o1Rbp
import com.adt.bo.Result; $_F_%m"\
import com.adt.service.UserService; j;`pAN('
import com.opensymphony.xwork.Action; 5@xR`g-
oT\K P
/** Ga5s9wC
* @author Joa #ELeW3
S}
*/ b\0>uU
publicclass ListUser implementsAction{ B2kZ_4rB
fx|d"VF[
privatestaticfinal Log logger = LogFactory.getLog LG:k}z/T
mI7lv;oN<5
(ListUser.class); 6]iU-k0b
d0)]^4HT|y
private UserService userService; ?+.mP]d_
#A5X,-4G
private Page page; UE^o}Eyg
W!<7OA g $
privateList users; C_N|o|dX
Z
01A~_
/* [p6:uNo
* (non-Javadoc) ]B )nN':
* c?CD;Pk
* @see com.opensymphony.xwork.Action#execute() rx9*/Q0F
*/ jVnTpa!A
publicString execute()throwsException{ 8vuTF*{yZ
Result result = userService.listUser(page); o6A$)m5V
page = result.getPage(); hM]Z T5;<
users = result.getContent(); MU$tX
return SUCCESS;
`vH|P
} Kn->R9Tl
Bg),Q8\I
/** ^mq(j_E.
* @return Returns the page. -7&ywgxl
*/ i6HRG\9nU
public Page getPage(){ e$s&B!qJ
return page; XnP?hw%
} ^"7-`<J
Az@@+?,%Y
/** =
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* @return Returns the users. >fYcr#i0[
*/ $\ZWQct
publicList getUsers(){ fJ8>nOh
return users; Q`*U U82!
} \C$e+qb~{
In1{&sS
/** }169]!R
* @param page UdrgUqq)
* The page to set. !(q@sw(
*/ KyrZ&E.`
publicvoid setPage(Page page){ A@>/PB6n
this.page = page; {{G3^ysa
} t|'%0 W
hk=[v7
/** L'Cd`.yVO
* @param users A4,%l\di<
* The users to set. BlpyE[h
T
*/ JE}VRMNr
publicvoid setUsers(List users){ 5,,'hAq_
this.users = users; !@lx|=#
} G%HG6
}~W/NP_F
/** L91vp'+2
* @param userService f#&z