Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 .wWf#bB
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 |a /cw"
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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 +!`$(
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 *!Gb_!98
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分页支持类: MIZ!+[At
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java代码: ^ yF
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package com.javaeye.common.util; {- MhhRa5
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import java.util.List; ,O^kZ}b
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publicclass PaginationSupport { (5y*Btd=
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publicfinalstaticint PAGESIZE = 30; 8F)9.s,*
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privateint pageSize = PAGESIZE; 6 W$m,3Dg
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privateList items; {S%;By&[
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privateint totalCount; X.q#ZpK
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privateint[] indexes = newint[0]; ]^a{?2ei
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privateint startIndex = 0; -W})<{End
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public PaginationSupport(List items, int *>o@EUArN
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totalCount){ ~+RrL,t#
setPageSize(PAGESIZE); xBw ua;
setTotalCount(totalCount); t)(>E'X
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setItems(items); Ur""&@
setStartIndex(0); 3rX8H`R
} (~b0-3s
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public PaginationSupport(List items, int Lr"`OzDz
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totalCount, int startIndex){ WS@8Z0@RD
setPageSize(PAGESIZE); Dl}va
setTotalCount(totalCount); S|IDFDn
setItems(items); IZ.b
setStartIndex(startIndex); (51;cj>J
} IUh)g1u41O
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public PaginationSupport(List items, int Ye>+
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totalCount, int pageSize, int startIndex){ Y[ ;Z7p
setPageSize(pageSize); lgHzI(
setTotalCount(totalCount); .
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setItems(items); -#AO4xpI
setStartIndex(startIndex); 3[m~6Ys
} 4'`*Sce}
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publicList getItems(){ cavzXz
return items; 4&`d$K
} l~*d0E-$
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publicvoid setItems(List items){ oYeFOw`
this.items = items; lJ4/bL2I/
} lstnxi%x
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publicint getPageSize(){ S?~/
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return pageSize; 7{f{SIB
} (*!4O>]
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publicvoid setPageSize(int pageSize){ $I\lJ8
this.pageSize = pageSize; <>=abgg
} twPD'X!r
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publicint getTotalCount(){ l-[5Zl;"
return totalCount; @#5?tk0
} (G{2ec:?
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publicvoid setTotalCount(int totalCount){ v%Su#xq/
if(totalCount > 0){ T@N)BfkB
this.totalCount = totalCount; qNbgN{4
int count = totalCount / Ymg,NkiP0
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pageSize; ogE|8`Tq^
if(totalCount % pageSize > 0) Mj |"+(
count++;
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indexes = newint[count]; {=E,.%8
for(int i = 0; i < count; i++){ 5U JMiwP{
indexes = pageSize * <d3N2
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i; M 0RVEhX
} B+=Xb;p8
}else{ K%>3ev=y.s
this.totalCount = 0; 1f5;^T
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} th|TwD&mO
} ebB8.(k9G3
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publicint[] getIndexes(){ YoRD9M~iG~
return indexes; G/}nwj\
} K6oQx)|
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publicvoid setIndexes(int[] indexes){ f<2<8xS
this.indexes = indexes; G%fNGQwT
} Kdb:Q0B
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publicint getStartIndex(){ s!K9-qZl<
return startIndex; K9euNa
} zzyD'n7D
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publicvoid setStartIndex(int startIndex){ m9f[nT
if(totalCount <= 0) VaylbYUCT/
this.startIndex = 0; }kb6;4>c
elseif(startIndex >= totalCount) A ]~%<=b
this.startIndex = indexes %;tBWyq}_
u=!n9W~"
[indexes.length - 1]; <o&\/uO~H
elseif(startIndex < 0) $PKUcT0N9
this.startIndex = 0; Y\7/`ty
else{ aboA9pwH
this.startIndex = indexes ^Jn=a9Q6Z
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[startIndex / pageSize]; V%!my[b
} ^o6&|q
} i@spd5.
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publicint getNextIndex(){ &<S]=\
int nextIndex = getStartIndex() + hvU\l`m
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pageSize; !5h@uar
if(nextIndex >= totalCount) I)cA:Ip
return getStartIndex(); u1i
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else ++M%PF [
{
return nextIndex; Z "g6z#L&
} 6I$:mHEhd
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publicint getPreviousIndex(){ nL-kBW Ed>
int previousIndex = getStartIndex() - -&_;x&k
/
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pageSize; 5NAB^&{Z<X
if(previousIndex < 0) Cr$8\{2OA7
return0; c9N5c
else WCZeY?_^c
return previousIndex; !mRDzr7
} UG<`m]
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} !V;glx[
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抽象业务类 t:.ZvA3
java代码: Z }Z]["q
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/** 05Go*QvV
* Created on 2005-7-12 ?513A>U
*/ Cu+u'&U!
package com.javaeye.common.business; M-+=t8
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import java.io.Serializable; jneos~ 'n8
import java.util.List; #R$[?fW
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import org.hibernate.Criteria; t+Rt*yjO
import org.hibernate.HibernateException; dsUY[X-<6
import org.hibernate.Session; 04cNi~@m
import org.hibernate.criterion.DetachedCriteria; r:uW(<EP^
import org.hibernate.criterion.Projections; Di8;Tq
import \mp5G&+/Q
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org.springframework.orm.hibernate3.HibernateCallback; iKN800^u
import 4 Z<
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org.springframework.orm.hibernate3.support.HibernateDaoS X mX
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upport; [E/}-m6g
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import com.javaeye.common.util.PaginationSupport; JqmKD4p
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public abstract class AbstractManager extends _ 0Ced&i
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HibernateDaoSupport { "sU ~|
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privateboolean cacheQueries = false; `OmYz{*r
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privateString queryCacheRegion; 4\%XC
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publicvoid setCacheQueries(boolean ngHPOI16
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cacheQueries){ Ghpk0ia%d
this.cacheQueries = cacheQueries; eEG]JH
} gELb(Y\ak
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publicvoid setQueryCacheRegion(String F"M$ "rC]
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queryCacheRegion){ !%{s[eO\
this.queryCacheRegion = ^U4|TR6mub
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queryCacheRegion; h8lI#Gs
} pe1 _E
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publicvoid save(finalObject entity){ I!1nB\l
getHibernateTemplate().save(entity); Y2,\WKa
} $"&U%3
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publicvoid persist(finalObject entity){ H;OPA8\n
getHibernateTemplate().save(entity); f:-dw6a=s
} Ew kZzVuX
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publicvoid update(finalObject entity){ W=k%aB?p
getHibernateTemplate().update(entity); Ly$s0.!
} z.7'yJIP#
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publicvoid delete(finalObject entity){ )4P5i
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getHibernateTemplate().delete(entity); Qe )#'$T
} on q~wEr
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publicObject load(finalClass entity, SAEV "
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finalSerializable id){ KVrK:W--p
return getHibernateTemplate().load mTW@E#)n
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(entity, id); %g>{m2o
} PNbs7f
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publicObject get(finalClass entity, !B3lsXLSY
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finalSerializable id){ #`0iN+qh
return getHibernateTemplate().get 7o4 vf~
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(entity, id); F^]?'`7md
} cs%NsnZ
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publicList findAll(finalClass entity){ (Q$]X5L
return getHibernateTemplate().find("from }bs2Rxkh
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" + entity.getName()); A<&:-Zz
} D?w-uR%Y
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publicList findByNamedQuery(finalString d[9NNm*htC
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namedQuery){ /e5Fx
return getHibernateTemplate X; gN[
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().findByNamedQuery(namedQuery); [i '\d}
} DvuL1MeKo
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publicList findByNamedQuery(finalString query, )^&)f!f
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finalObject parameter){ W`PK9juu
return getHibernateTemplate W&>+~A
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().findByNamedQuery(query, parameter); z^f-MgWG
} CDcs~PR@B
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publicList findByNamedQuery(finalString query, ~%Ws"1
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finalObject[] parameters){ 3\,TI`^C
return getHibernateTemplate Xm`K@hJ@
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().findByNamedQuery(query, parameters); iDO~G($C
} "*@iXJxv5
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publicList find(finalString query){ g"3h#SMb
return getHibernateTemplate().find NRKAEf_#w
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(query); ~P5!VNJ;r
} Ej1 [ry
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publicList find(finalString query, finalObject |jV4]7Luq
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parameter){ <C4^Vem
return getHibernateTemplate().find X/1Z9a+W
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(query, parameter); T
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} IEzZ$9,A5
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public PaginationSupport findPageByCriteria e<^tY0rR&
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(final DetachedCriteria detachedCriteria){ ,>(M5\Z/c
return findPageByCriteria H[x 9 7r
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); D0QXvrf
} t:M({|m Y
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public PaginationSupport findPageByCriteria #k=!>%+E
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(final DetachedCriteria detachedCriteria, finalint Smk]G))o{
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startIndex){ ,`|KNw5
return findPageByCriteria d*3R0Q|#{
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(detachedCriteria, PaginationSupport.PAGESIZE, -T{~m6
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startIndex); Qb# S)[6s+
} VH*j3
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public PaginationSupport findPageByCriteria c2"eq2'BS
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(final DetachedCriteria detachedCriteria, finalint v%aD:%wlY@
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pageSize, 33Mr9Doon
finalint startIndex){ 4
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return(PaginationSupport) n?,fF(
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getHibernateTemplate().execute(new HibernateCallback(){ 72-@!Z0e
publicObject doInHibernate &P ;6P4x
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(Session session)throws HibernateException { +[2lS54"W4
Criteria criteria = 00pHnNoxW
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detachedCriteria.getExecutableCriteria(session); !#iP)"O
int totalCount = hGus!p"lw
db%`-UST
((Integer) criteria.setProjection(Projections.rowCount TU. h
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()).uniqueResult()).intValue(); ;U`HvIch
criteria.setProjection 0XozYyq
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(null); _F3vC#
List items = h}`<pq
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criteria.setFirstResult(startIndex).setMaxResults jEO;
\W@?revK
(pageSize).list(); sox90o 7
PaginationSupport ps = F37,u|
<I|ryPU9{X
new PaginationSupport(items, totalCount, pageSize, jA]xpf6}
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startIndex); A`r&"i OKA
return ps; Y2$%%@
} 3]VTQl{P
}, true); t1~*q)!Mo
} #-VKk
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public List findAllByCriteria(final )O&$-4gL'
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DetachedCriteria detachedCriteria){ Ns9g>~
return(List) getHibernateTemplate MoFZ
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().execute(new HibernateCallback(){
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publicObject doInHibernate OIWo*
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(Session session)throws HibernateException { Lq&xlW
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Criteria criteria = oD}I{&=wa
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detachedCriteria.getExecutableCriteria(session); P2Eyqd8
return criteria.list(); k<f*ns
} i/Hi
}, true); (^Ln|3iz
} -zTeIvcy5
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public int getCountByCriteria(final >ab=LDoM
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DetachedCriteria detachedCriteria){ #e0+;kBh
Integer count = (Integer) <St`"H
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getHibernateTemplate().execute(new HibernateCallback(){ @O(\TIg
publicObject doInHibernate ``\H'^{B
7:;V[/
(Session session)throws HibernateException { FJ[(dGKeE
Criteria criteria = JEd/j
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detachedCriteria.getExecutableCriteria(session); 6Rt pB\hq
return '\;tmD"N5#
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criteria.setProjection(Projections.rowCount 1 h"B-x
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()).uniqueResult(); f[ywC$en
} 1GNAx\(
}, true); SVHtv0Nx
return count.intValue(); a&<<X:$Hy
} s6
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} &,)tD62s
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用户在web层构造查询条件detachedCriteria,和可选的 ["7}u^z@<+
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 8;5/_BwMu
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PaginationSupport的实例ps。
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ps.getItems()得到已分页好的结果集 ~+g5?y
ps.getIndexes()得到分页索引的数组 5SjS~9
ps.getTotalCount()得到总结果数 M1i|qjb:l
ps.getStartIndex()当前分页索引 Psv!`K
ps.getNextIndex()下一页索引 xWMMHIu
ps.getPreviousIndex()上一页索引 kDKpuA!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 MoA{ /{
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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 kmS8>O
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一下代码重构了。 eOb`uyi
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我把原本我的做法也提供出来供大家讨论吧: Y:a(y*y<
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首先,为了实现分页查询,我封装了一个Page类: p%s
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java代码: JjmL6(*ui
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/*Created on 2005-4-14*/ ![ QQF|
package org.flyware.util.page; =bDG|:+
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/** =~h54/#[I
* @author Joa (pmo[2kg
* q2Kn3{
*/ jz)H?UuDY
publicclass Page { piP8ObGjy
Rc4EFHL
/** imply if the page has previous page */ Q@8[q l1l
privateboolean hasPrePage; >W;i2%T
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/** imply if the page has next page */ qj1z>,\
privateboolean hasNextPage; X=3@M_Jzo
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/** the number of every page */
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privateint everyPage; c;^ J!e
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/** the total page number */ R+K[/AA
privateint totalPage; #RF=a7&F
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/** the number of current page */ gy{a+Wbc*
privateint currentPage; <} %ir,8
B /W$RcV
/** the begin index of the records by the current E(@;p%:
\ p$0
query */ j1ZFsTFMWp
privateint beginIndex; 9)">()8
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/** The default constructor */ U]|q4!WE
public Page(){ IfcFlXmt2
,<1*
} 6"7qZq
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/** construct the page by everyPage Ro<kp8
* @param everyPage aW"!bAdx`,
* */ #lF<="y%X
public Page(int everyPage){ K(gj6SrjV
this.everyPage = everyPage; i.sq^]j
} guv@t&;t0
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/** The whole constructor */ Z=0W@_s
public Page(boolean hasPrePage, boolean hasNextPage, =FmU]DV
x/=j$oA
j;)6uia*A
int everyPage, int totalPage, qedGBl&
int currentPage, int beginIndex){ MbfzGYA2~
this.hasPrePage = hasPrePage; eEQ[^i
this.hasNextPage = hasNextPage; "|%9xGX|D
this.everyPage = everyPage; WM"^#=+$
this.totalPage = totalPage; 4*x!B![]y
this.currentPage = currentPage; PAHlj,n)
this.beginIndex = beginIndex; 0Mg8{
} F:S,{&jB
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/** 7g)3\C
* @return @@wx~|%
* Returns the beginIndex. CeTr%j
*/ %7msAvbk
publicint getBeginIndex(){ >|)0Amt
return beginIndex; ImY.HB^&
} >x4[7YAU{
d8HB2c5y0i
/** }&DB5M
* @param beginIndex =[JN'|Q+
* The beginIndex to set. |lxy< C4V
*/ hZ<btN.y5
publicvoid setBeginIndex(int beginIndex){ cA?
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this.beginIndex = beginIndex; |L;psK
} xV#a(>-4
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/** rf->mk{
* @return f_ztnRw
* Returns the currentPage. /y)"j#-eW
*/ |A0$XU{
publicint getCurrentPage(){ v9U(sEDq
return currentPage; 8/"|VE DOr
} V=&,^qZ
abeSkWUL(
/** DYlvxF`
* @param currentPage d&uTiH? 0
* The currentPage to set. X5Y
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*/ \oX8/-0 f
publicvoid setCurrentPage(int currentPage){ R: <@+z^A[
this.currentPage = currentPage; _-]!;0EIV
} )7GLS\uf<%
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/** 8e!DDh
* @return pYl{:uIPN8
* Returns the everyPage. ;9 ,mV(w
*/ HhmVV"g
publicint getEveryPage(){
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return everyPage; `t0f L\T
} j yRSEk$
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/** -'[(Uzj
* @param everyPage Wi[m`#
* The everyPage to set. -I-Uh{)j
*/ *3O >J"
publicvoid setEveryPage(int everyPage){ zN+*R;Ds
this.everyPage = everyPage; =kh>s$We
} >:E*7
f&}A!uLe4x
/** &3Z.
#*
* @return &4Con%YU[
* Returns the hasNextPage. HI\f>U
*/ *fi;ZUPW3
publicboolean getHasNextPage(){ P%sO(_PuT
return hasNextPage; $[iT~B$
} IT`=\K/[4
^qO=~U!{
/** !UoU#YU
* @param hasNextPage Zknewv*sS4
* The hasNextPage to set. C$LRY~\
*/ 6_<s=nTX
publicvoid setHasNextPage(boolean hasNextPage){ c~UAr k S
this.hasNextPage = hasNextPage; i9eyrl+!
} s
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/** s!ZW'`4!z
* @return z8/xGQn
* Returns the hasPrePage. pp]_/46nN
*/ +K%pxuVh
publicboolean getHasPrePage(){ pzq;vMr
return hasPrePage; {HHh.K
} r1ok u0 o
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/** <D!c
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* @param hasPrePage KO"Jg-6r|
* The hasPrePage to set. dHG Io
*/ 8b:clvh
publicvoid setHasPrePage(boolean hasPrePage){ %gu$_S
this.hasPrePage = hasPrePage; )p<fL
} AB"1(PbG
ZSPgci
/** W 9Vz[
* @return Returns the totalPage. *el(+ib%
* yYToiW *
*/ n<?SZ^X{,/
publicint getTotalPage(){ T+WZE
return totalPage; 5BHOHw D{
}
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/** |'c4er/;#
* @param totalPage ?Z Rkn+;
* The totalPage to set. 5,
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*/ wI!
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publicvoid setTotalPage(int totalPage){ t0e{|du
this.totalPage = totalPage; M_h8#7 {G
} U.RW4df%E
lMBX!9z
} \ I^nx+l
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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 N )zPxQ
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个PageUtil,负责对Page对象进行构造: T2DF'f3A
java代码: Yz=h"Zr
4YDT%_h0
jj!N39f
/*Created on 2005-4-14*/ }UKgF.
package org.flyware.util.page; WVS$O99Y
LBmM{Gu
import org.apache.commons.logging.Log; Ak5[PBbW
import org.apache.commons.logging.LogFactory; "H>r-cyh
-,QKTxwo>
/** e^k!vk-SLF
* @author Joa ;Y'8:ncDn
* 6|
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*/ 7q%|4Z-~
publicclass PageUtil { ^^7L"je]g
euV $2Fg
privatestaticfinal Log logger = LogFactory.getLog @s%X
i}PK$sa#c
(PageUtil.class); ?}'N_n ys
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/** W/ g|{t[
* Use the origin page to create a new page e9CP802#2
* @param page ^W
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* @param totalRecords `FA)om
* @return >vWEUE[
*/ U~uwm/h
publicstatic Page createPage(Page page, int 6FL?4>MZ
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totalRecords){ c ]>DI&$;J
return createPage(page.getEveryPage(), LH=d[3Y
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page.getCurrentPage(), totalRecords); u64@"P
} #^|| ]g/N
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/** !1a}| !Zn
* the basic page utils not including exception R'6@n#:
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handler i@P 9EU
* @param everyPage <7=&DpjI7F
* @param currentPage _*s~`jn{H
* @param totalRecords P+Wm9xR2d
* @return page zlH28V
*/ h&lyxYZ+T$
publicstatic Page createPage(int everyPage, int X<(6T
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currentPage, int totalRecords){ {7vgHutp
everyPage = getEveryPage(everyPage); [6AHaOhR'
currentPage = getCurrentPage(currentPage); Ri|k<io
int beginIndex = getBeginIndex(everyPage, M_k`%o
8
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currentPage); JC=dYP}
int totalPage = getTotalPage(everyPage, di7A/B
Da-u-_~
totalRecords); B@-|b
boolean hasNextPage = hasNextPage(currentPage, hZcmP"wgC1
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totalPage); zhNQuK,L
boolean hasPrePage = hasPrePage(currentPage); ?-e7e%
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returnnew Page(hasPrePage, hasNextPage, >Q;
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everyPage, totalPage, O?CdAnhQc`
currentPage, R7lYu\mA
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beginIndex); Te# ]Cn|
} PPEq6}
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privatestaticint getEveryPage(int everyPage){ Qh*)pt]n
return everyPage == 0 ? 10 : everyPage; <mL%P`Jj
} C
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privatestaticint getCurrentPage(int currentPage){ z.
'Fv7
return currentPage == 0 ? 1 : currentPage; $; ?c?n+
} C>^,*7dS
wb
b*nL|P
privatestaticint getBeginIndex(int everyPage, int kP@HG<~
IXnb]q.
currentPage){ TN5>" ??"
return(currentPage - 1) * everyPage; yq?]V7~
} kd yAl,
Tr~sieL
privatestaticint getTotalPage(int everyPage, int rWA6XDM7
I?B,sl_w
totalRecords){ :$Q`>k7A
int totalPage = 0; GQb i$kl
eH
%Ja[
if(totalRecords % everyPage == 0) GWhE8EDT
totalPage = totalRecords / everyPage; ?=<~^Lk
else H<g 1m
totalPage = totalRecords / everyPage + 1 ; /jM_mrpz
i0>]CJG
return totalPage; !$_~x
8K1-
} ?\ZL#)hr"p
yNBv-oe5
privatestaticboolean hasPrePage(int currentPage){ <:">mV+/
return currentPage == 1 ? false : true; e!GZSk
} D93gH1z
HmMO*k<6@
privatestaticboolean hasNextPage(int currentPage, =-w;zx
xYPxg!
int totalPage){ z`4c 4h]I
return currentPage == totalPage || totalPage == RND9D\7
V^WU8x
0 ? false : true; Q=WySIF.
} lCR!:~
w9MoT.kI}
R::zuv
} 'S*k_vuN
wjrG7*_Y4v
M%I@<~wl
Xwt`(h[u
M*w' 1fT
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。 Jd_;@(Eg=
,!Q]q^{C:W
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 d`mD!)j
96c?3ya
做法如下: {L].T#
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 BgM%+b8u
-}P7$|O&
的信息,和一个结果集List: &dr@6-xaq
java代码: 9gy(IRGq/
FH8k'Hxg
{WQq}-(
/*Created on 2005-6-13*/ ygzxCn|#
package com.adt.bo; s9 @Sd
.fp&MgiQ
import java.util.List; 5pfYEofK[
H>XFz(LWh
import org.flyware.util.page.Page; 5!(?m~jJ
^`XCT
/** 19W:-Om
* @author Joa lq>AGw
*/ Y1)!lTG
publicclass Result { nls
-_em%o3XC
private Page page; dEp7{jY1O
2%]Z
Kd
private List content; ^nNitF
T]9m:zX9s
/** ((bTwx
* The default constructor O$D?A2eI
*/ rzUlO5?R=
public Result(){ P6\6?am
super(); 3TS_-l
} XKS8K4"
2'] KTHm
/** <CZgQ\Mt
* The constructor using fields , jU5|2
* $!B}$I;cd
* @param page ;j9\b9m
* @param content w!&~??&=}
*/
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(,.'
public Result(Page page, List content){ <%P2qgz5
this.page = page; YlF%UPp
this.content = content; 4<gb36)|4
} S6g<M5^R
&%mXYj3y5
/** WQ6"0*er
* @return Returns the content. Nd@~>&F
*/ Ef)yQ
publicList getContent(){ *F`A S>
return content; "@/62b
} hgj <>H|
'xE
_Cj
/** Fmr}o(q1
* @return Returns the page. yN6>VD{F
*/ C\*4q8(
public Page getPage(){ ,xfO;yd
return page; B*3Y!!
} !mMpb/&&S
bB}5U@G|
/** `5~3G2T
* @param content
rsXq- Pq*
* The content to set. p B;3bc
*/ OI}cs2m
public void setContent(List content){ &(N+.T5cp
this.content = content; .@ F]Pht
} <RNJ>>0
T~:|!`
/** 4\M.6])_
* @param page EYX$pz(x;
* The page to set. $O)3q
$|
*/ Y>+y(ck
publicvoid setPage(Page page){ tjT>VwqH
this.page = page; /Q{P3:k
} ;j8)KC
} 3?n>yS
w= P9FxB
L+}n@B
Iw<i@=V
tptN6Isuh
2. 编写业务逻辑接口,并实现它(UserManager, OTDg5:>
H1n1-!%d
UserManagerImpl) NMOut@
java代码: QPtGdd
}g7]?Ee
n\z,/'d"
/*Created on 2005-7-15*/ Z|"p*5O,
package com.adt.service; j _L@U2i
wV\gj~U;P
import net.sf.hibernate.HibernateException; d5 7i)=
<FI-zca
import org.flyware.util.page.Page; ma'FRt
!V2/A1?
import com.adt.bo.Result; sZGj"_-Hzu
6Htg5o|W
/** F#
T 07<
* @author Joa 9d[5{"2j
*/ jh2t9SI~
publicinterface UserManager { #n0Y6Pr
RPd}Wf
public Result listUser(Page page)throws Z[__"^}
91>fqe
HibernateException; U-/{0zB
K"j_>63)
} VA*y|Q6
D^%^xq)E
'R`tLN
z4M9M7)"
?;/^Ya1;Z
java代码: $Iv2j">3)
W"^wnGa@a
a<}#HfC;'
/*Created on 2005-7-15*/ ]0hrRA`
package com.adt.service.impl; Mj[f~
JRCrZW}
import java.util.List; <S?ddp2
< -W*$?^
import net.sf.hibernate.HibernateException; MUfG?r\t
Q'_z<V
import org.flyware.util.page.Page; tyaA\F57
import org.flyware.util.page.PageUtil; FFdBtB
b4^`DHRu6
import com.adt.bo.Result; ;q N+^;,2
import com.adt.dao.UserDAO; *HEuorl
import com.adt.exception.ObjectNotFoundException; >D201&*G%
import com.adt.service.UserManager; )jrV#/m9
/|6;Z}2
/** g~(E>6Y
* @author Joa 2^8%>,
*/ cuy1DDl
publicclass UserManagerImpl implements UserManager { zg-2C>(6a
jck}" N
private UserDAO userDAO; ys 5&PZg*
Vz6Qxd{m3
/** aaD;jxT&M|
* @param userDAO The userDAO to set. UG=K|OXWJ
*/ "Ph^BUAb
publicvoid setUserDAO(UserDAO userDAO){ NaX
this.userDAO = userDAO; ?QE,;QtpK
} |2{wG4
>4t+:Ut:
/* (non-Javadoc) UTXSeNP
* @see com.adt.service.UserManager#listUser g8PTGz
B&D}F=U
(org.flyware.util.page.Page) 6k#Jpmmr
*/ !%$`Eq)M^7
public Result listUser(Page page)throws qucq,Yw
x c{hC4^V
HibernateException, ObjectNotFoundException { x?&$ ci
int totalRecords = userDAO.getUserCount(); ,}K<*t[I
if(totalRecords == 0) [jmd
throw new ObjectNotFoundException bV,}Pp+/"!
9k{PBAP
("userNotExist"); 2RSt)3!},
page = PageUtil.createPage(page, totalRecords); ;G%R<Z
List users = userDAO.getUserByPage(page); yn#X;ja-
returnnew Result(page, users); lok=
} \L"kV!>
)ZN|t?|
} qvPtyc^fN
M![J2=
jy'13G/b\
z[Xd%mhjO
P#AW\d^"B
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 AM!G1^c
eH{[C*
询,接下来编写UserDAO的代码: (DI>5.x"
3. UserDAO 和 UserDAOImpl: c"[cNZo
java代码: x)@G;nZ
r(P(Rj2~
I1X-s
/*Created on 2005-7-15*/ b9l;a+]d
package com.adt.dao; 5k.oW=
ga`3 (
import java.util.List; <[-nF"Q
,k;^G><
=
import org.flyware.util.page.Page; #)nSr
dUhY\v oQ
import net.sf.hibernate.HibernateException; \ZkA>oO".
`7r@a
/** cH&J{WeZa
* @author Joa ZusEfh?
*/ sr{a(4*\
publicinterface UserDAO extends BaseDAO { |AozR ~
jWrj?DV,2N
publicList getUserByName(String name)throws '!eKTC>
9J2NH|]c
HibernateException; 32`{7a3!=
,Pdf,2
publicint getUserCount()throws HibernateException; y#3j`. $3p
N$U$5;r~`
publicList getUserByPage(Page page)throws
@fl-3q
73/P&hT
HibernateException; <4HDZ{"M
AT2n VakL
} 75XJL;W #
kH
G"XTL
Q$zO83
&B6Ep6QS
f,018]|
java代码: X\bOz[\
;)D];u|_
xHD=\,{ig
/*Created on 2005-7-15*/ 2#c<\s|C
package com.adt.dao.impl; ww],y@da
R}*_~7r5
import java.util.List; 8Djc
c
z
*%%g{
3$
import org.flyware.util.page.Page; VHIOwzC
0Ziw_S\d&s
import net.sf.hibernate.HibernateException; P\1L7%*lU
import net.sf.hibernate.Query; nU7>uU
v>Q#B
import com.adt.dao.UserDAO; \1D<!k\S
RO 4Z?tz
/** e4?>-
* @author Joa RBs-_o+ %
*/ 2N: ,Q8~
public class UserDAOImpl extends BaseDAOHibernateImpl [YlKR'_
[XEkz#{
implements UserDAO { ;DFSzbF`
21K>`d\
/* (non-Javadoc) )48QBz?
* @see com.adt.dao.UserDAO#getUserByName TJK[ev};S
*Q?tl\E
(java.lang.String) #49kjv@
*/ g?z/2zKR
publicList getUserByName(String name)throws 3G}x;Cp\D
1g8_Xe4
HibernateException { nn@-W]
String querySentence = "FROM user in class c;Pe/ d
2bw_IT
com.adt.po.User WHERE user.name=:name"; J:CXW%\ <q
Query query = getSession().createQuery hI]Hp3S
B-ngn{Yc
(querySentence); .HS"}A T
query.setParameter("name", name); ;oW6 NJ
return query.list();
mF*2#]%dx
} 0D\#Pq
v
}X)&zenz
/* (non-Javadoc) ,':fu
* @see com.adt.dao.UserDAO#getUserCount()
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*/ Mo?~_|}
publicint getUserCount()throws HibernateException { V58wU:li
int count = 0; JTO~9>$ B
String querySentence = "SELECT count(*) FROM de.&`lPRf
Dz>^IMsY
user in class com.adt.po.User"; )h"<\%LU
Query query = getSession().createQuery y{ibO}s
^1iSn)&
(querySentence); JEXy%hl
count = ((Integer)query.iterate().next DFZkh^PFd
b6nsg|
()).intValue(); ;RDh~EV
return count; @XLy7_}
} `Q|*1
(eI5_`'VC
/* (non-Javadoc) JjPKR?[>
* @see com.adt.dao.UserDAO#getUserByPage PF)jdcX
K1mPr^3rC
(org.flyware.util.page.Page) *"?l ]d
*/ [#-b8Cu
publicList getUserByPage(Page page)throws @L<*9sLWh
7Ri46Tkt
HibernateException { Xe6w|
String querySentence = "FROM user in class ~
{E'@MU
wvO|UP H\
com.adt.po.User"; MLw7}[
Query query = getSession().createQuery 0
HGM4[)=
R.jIl@p
(querySentence); sF!($k;!
query.setFirstResult(page.getBeginIndex()) fd+hA
.setMaxResults(page.getEveryPage()); UK595n;P
return query.list(); _"?.!
} |^: cG4e
Aydm2!l1
} zKw`Md
HG^B#yX
.{ocV#{s
jF ^~p9z
msP{l^%0
至此,一个完整的分页程序完成。前台的只需要调用 rID#`:Hl-|
EN$2,qf
userManager.listUser(page)即可得到一个Page对象和结果集对象 K-bD<X
*W.C7=
的综合体,而传入的参数page对象则可以由前台传入,如果用 <;vbsksZeH
f,h J~
webwork,甚至可以直接在配置文件中指定。 h].<t&
"$#xK |t
下面给出一个webwork调用示例: ;YA(|h<
java代码: |SoCRjuCPM
tjIl-IQ
a|%J=k>>
/*Created on 2005-6-17*/ 9>l*lCA
package com.adt.action.user; Ov5"
w`4=_J=GO
import java.util.List; 7E!IF>`
>6NRi /[
import org.apache.commons.logging.Log; $G8E 3|k
import org.apache.commons.logging.LogFactory; S{]x
import org.flyware.util.page.Page; SX<` {x&L
iP
=V8g?L
import com.adt.bo.Result; d74d/l1*{
import com.adt.service.UserService; 2)G
%)'
import com.opensymphony.xwork.Action; -e_hrCW&9
3kw,(-'1
/** =d".|k
* @author Joa &M46&^Jho
*/ kDEPs$^
publicclass ListUser implementsAction{ #xho[\
(61EDKNd9
privatestaticfinal Log logger = LogFactory.getLog *^g:P^4
)Q1"\\2j0
(ListUser.class); 6g 5#TpCh
^A!Qc=#z}
private UserService userService; ;T"zV{;7BR
HBy[FYa4
private Page page; 1,6}_MA
NG--6\
privateList users; 2;zb\d
A0o-:n Fu
/* ti5mIW\
* (non-Javadoc) GC>e26\:
* 2Z-ljD&
* @see com.opensymphony.xwork.Action#execute() !Y$h"<M
*/ O~T@rX9f
publicString execute()throwsException{ Cbg!:Cws
Result result = userService.listUser(page); FKIw!m ~
page = result.getPage(); f-bVKHt
users = result.getContent(); h}*/Ge]aM
return SUCCESS; /j4P9y^]=
} ".W8)
<vUbv
/** Z3#P,y9@
* @return Returns the page. U}6B*Xx'
*/ 6ys
&zy
public Page getPage(){ iI\oz&!vH
return page; gnFr}L&j
} C9~52+S
I%r{]-Obr-
/** >[9J?H
* @return Returns the users. 2/?`J
*/ 9f2UgNqe9
publicList getUsers(){ isQ[ Gc!8
return users; u])b,9&En
} :e_V7t)o
d@ i}-;
/** ?\vh9
* @param page 'm4W}F
* The page to set. )Hpa}FGT
*/ Z)! qW?
publicvoid setPage(Page page){ G!"YpYml
this.page = page; d*jMZ%@uS
} wj,:"ESb4
@CTgT-0!
/** Yn@lr6s
* @param users :K-~fA%kt?
* The users to set. Q?nN!eT
*/ U*i{5/$
publicvoid setUsers(List users){ b:Wm8pp?
this.users = users; xCg52zkH#
} ox(j^x]NC
jE}33"
/** &^#VN%{
* @param userService H7d/X
* The userService to set. +wEac
g>>E
*/ e7m*rh%5>
publicvoid setUserService(UserService userService){ JTr vnA
this.userService = userService; SSPHhAeH8
} A Y*e@nk\
} UaWl6 Y&Vu
"Q!(52_@J
~Lm$i6E<
:<hXH^n
F@mQQ
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, r~/
rf>0H^r
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 ?$*SjZt
g'H$R~ag
么只需要: G_0(
|%
java代码: n;@bLJ$W
fDT%!
W8ouO+wK
<?xml version="1.0"?> `-(|>5wWS
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork =T(6#"
N>XS=2tzN
1.0//EN" "http://www.opensymphony.com/xwork/xwork- $})g?Q
r[BVvX/,F
1.0.dtd"> l8I /0`_
swK-/$#
<xwork> V!lZ\)
lr`&mZ( j
<package name="user" extends="webwork- qAn! Rk A
pi
Z[Y
5OE
interceptors"> MCS8y+QK
?AJKBW^
<!-- The default interceptor stack name 7*
yzEM
*~t6(v?
--> v.pBX<
<default-interceptor-ref tnPv70m
d/BM&r
name="myDefaultWebStack"/> LcUh;=r}&
I1pWaQ0
<action name="listUser" aMtsmL?=
JT3-AAi[Z
class="com.adt.action.user.ListUser"> ^>i63Yc
<param K_RjX>q%N
+89*)pk
name="page.everyPage">10</param> 1guJG_;z
<result N+Y]st+
I aGq]z
name="success">/user/user_list.jsp</result> LIcM3_.
</action> lu<xv
0`X]o'RxS
</package> $,,op(
Jtr"NS?a]
</xwork> ~/98Id}v
L3@82yPo!
/J=v]<87a
RxI(:i?
SKkUU^\#R`
nEJY5Bz$
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 n2)@S0{
qU#1i:(F*
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。 f@Zszt
Q36qIq_0e
注:上面的<param>的配置,还需要webwork和Spring整合的配合。 V:VO[e<e
~GL]wF2#
n ~shK<!C
n[G &ksQI
2/"u5
我写的一个用于分页的类,用了泛型了,hoho >'&p>Ad)
(oEC6F
java代码: IOqwCD[
uI1q>[
XCU7xi$d
package com.intokr.util; w8U&ls