Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 75kKDR}6
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Wx}M1&d/J
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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 sfyBw
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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 |3 ;u"&(P
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。 ZH_FA
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分页支持类: {d^Q7A:`
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java代码: qC\]"Z`m
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package com.javaeye.common.util; }iD$4\ L
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import java.util.List; JOJh,8C)6
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publicclass PaginationSupport { c/b%T
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publicfinalstaticint PAGESIZE = 30; u/_Gq[Q,u
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privateint pageSize = PAGESIZE; &}>|5>cJu
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privateList items; ==nYe{2
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privateint totalCount; SrdE>fNbs
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privateint[] indexes = newint[0]; m~##q}LZ
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privateint startIndex = 0; ^OsA+Ea\
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public PaginationSupport(List items, int
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totalCount){ EfFj!)fz
setPageSize(PAGESIZE); ]#vWKNv:;
setTotalCount(totalCount); Q.rB\8ea
setItems(items); tceIA8d6
setStartIndex(0); FTbT9
} ;:AG2zE!
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public PaginationSupport(List items, int N{ : [/
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totalCount, int startIndex){ iPA@<D%
setPageSize(PAGESIZE); $/NGNkl[
setTotalCount(totalCount); C]yvK}
setItems(items); o~Bk0V=
setStartIndex(startIndex); Pbc`LN/s|
} L.SDM z
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public PaginationSupport(List items, int X
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totalCount, int pageSize, int startIndex){ NnJ>0|74g
setPageSize(pageSize); enPzy:C
setTotalCount(totalCount); UN,<6D3\b
setItems(items); -;sJ25(
setStartIndex(startIndex); aw%>YrJ
} g@$0FY{Q
hCU)W1q#
publicList getItems(){ x%b]ea
return items; U,oD44
} 4aj[5fhb-
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publicvoid setItems(List items){ NFdJb\
this.items = items; &z ./4X
} z2rQ$O-#
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publicint getPageSize(){ 1i5 vW- '4
return pageSize; D
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} tfi2y]{A
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publicvoid setPageSize(int pageSize){ mJwv&E
this.pageSize = pageSize; K~7'@\2
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} p+u{W"I`
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publicint getTotalCount(){ ]+}:VaeA
return totalCount; I'KR'1z 9
} R=2
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publicvoid setTotalCount(int totalCount){ E`oSi
ez)
if(totalCount > 0){ ZkJY.H-F
this.totalCount = totalCount; &>d:ewM\
int count = totalCount / i;E9ZaW
W)6U6
pageSize; OU0xZ=G
if(totalCount % pageSize > 0) d/0/$Bz}P
count++; X !&"&n
indexes = newint[count]; NTv#{7q
for(int i = 0; i < count; i++){ wo,""=l
indexes = pageSize * MuCQxzvkhf
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i; uKLOh<oio
} V/QTYy1
}else{ :d!i[W*
this.totalCount = 0; tEi@p;Z>
} sW>P-
} ?TL2'U|M
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publicint[] getIndexes(){ Pur"9jHa4
return indexes; Hl%+F0^?
} Wh#_9);
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publicvoid setIndexes(int[] indexes){ !nP8ysB
this.indexes = indexes; cHqvkN`
} TzD:bKE&
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publicint getStartIndex(){ htdn$kqG
return startIndex; ~NNaLl
} R7\{w(`K
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publicvoid setStartIndex(int startIndex){ ?X8K$g
if(totalCount <= 0) lB5[#z
this.startIndex = 0; % xH>0
elseif(startIndex >= totalCount) +1JZB*W
this.startIndex = indexes =$:4v`W0(
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[indexes.length - 1]; n:}MULy;
elseif(startIndex < 0) [ *mCa:^
this.startIndex = 0; rsIt~w
else{ a=}">=]7
this.startIndex = indexes x| ~D(zo
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[startIndex / pageSize]; FM@W>+
} ;-<<1Jz/2
} 1xFhhncf
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publicint getNextIndex(){ I&Eg-96@
int nextIndex = getStartIndex() + N#2nH1C
PBPJ/puW
pageSize; &9jUf:g J0
if(nextIndex >= totalCount) +e{djp@m
return getStartIndex(); 8V53+]c$Y
else skmDsZzw
return nextIndex; P /f ~
} K>DnD0
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publicint getPreviousIndex(){ X*p:&=o
int previousIndex = getStartIndex() - I?:+~q}lZr
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pageSize; K4VPmkG
if(previousIndex < 0) cwDD(j
return0; eBLHT
else {~B4F}ES
return previousIndex; TZ[Fu{gZ
} c'wU O3S
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} duiKFNYN
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抽象业务类 _UbR8
java代码: ^/5E773
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/** Z?G3d(YT
* Created on 2005-7-12 01SFOPuR%(
*/ 9g^./k\8%
package com.javaeye.common.business; N#xM_Mpt
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import java.io.Serializable; .Q6{$Y%l
import java.util.List; '!|E+P-
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import org.hibernate.Criteria; ,_X,V!
import org.hibernate.HibernateException; \gPNHL*
import org.hibernate.Session; OM"T)4z
import org.hibernate.criterion.DetachedCriteria; Y9(i}uTi
import org.hibernate.criterion.Projections; 0I AaPz/e
import @v:ILby4-
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org.springframework.orm.hibernate3.HibernateCallback; C Ol%P
import wxr}*Z:ZMa
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org.springframework.orm.hibernate3.support.HibernateDaoS 6I6ZVSxb
}M"'K2_Z
upport; 0"D?.E"$r
#ui%=ja[:~
import com.javaeye.common.util.PaginationSupport; YJtOdgG|q
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public abstract class AbstractManager extends ?;r7j V/`j
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HibernateDaoSupport { V'|g
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privateboolean cacheQueries = false; 14)kKWG
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privateString queryCacheRegion; -<VF6k<
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publicvoid setCacheQueries(boolean Ml_:Q]kl^
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cacheQueries){ ?2bE=|
this.cacheQueries = cacheQueries; ]a@v)aa-
} ]MH
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publicvoid setQueryCacheRegion(String o@V/37!
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queryCacheRegion){ ;{)@ghD
this.queryCacheRegion = :WKyEt!3
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queryCacheRegion; I7-PF?
} w `9GygS
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publicvoid save(finalObject entity){ 0O9
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getHibernateTemplate().save(entity); M`g Kt(3
} ,;-cz-,
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publicvoid persist(finalObject entity){ ',-X#u
getHibernateTemplate().save(entity); (fjXp75
} C
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publicvoid update(finalObject entity){ -T="Ml&
getHibernateTemplate().update(entity); *{n,4d\..
} fJN9+l
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publicvoid delete(finalObject entity){ q|Tk+JH{5
getHibernateTemplate().delete(entity); TbUkqABm
} S>zKD
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publicObject load(finalClass entity, B 0fo[Ev
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finalSerializable id){ |r*1.V(
return getHibernateTemplate().load mwiPvwHrg
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(entity, id); '{_tDboY
} AT8,9
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publicObject get(finalClass entity, :zk.^q
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finalSerializable id){ er}'}n`@q
return getHibernateTemplate().get P_}_D{G
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(entity, id); ZkG##Jp\>
} 4w
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publicList findAll(finalClass entity){ P6Ol+SI#m
return getHibernateTemplate().find("from lu(Omds+
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" + entity.getName()); &b:Zln.j
} PzG:M7
@!tmUme1c
publicList findByNamedQuery(finalString M)It(K8R
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namedQuery){ '3,JL!
return getHibernateTemplate `>HthK
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().findByNamedQuery(namedQuery); p5 PON0dS
} Z-=7QK.\{
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publicList findByNamedQuery(finalString query, +.Ukzu~s
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finalObject parameter){ m<;" 1<k
return getHibernateTemplate o`]FH_
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().findByNamedQuery(query, parameter); W;*vcbP
} 1;sAt;/W8
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publicList findByNamedQuery(finalString query, S`PSFetC
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finalObject[] parameters){ l`G:@}P>G
return getHibernateTemplate oieLh"$
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().findByNamedQuery(query, parameters); YXOD
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} tg4&j$
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publicList find(finalString query){ )%W2XvG
return getHibernateTemplate().find (9QRg;
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(query); w9}IM149
} W..>Ny;'3
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publicList find(finalString query, finalObject B}bNl 7
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parameter){ :Gk~FRA|
return getHibernateTemplate().find zm.sX~j
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(query, parameter); Xm+3`$<
} >I;#BE3
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public PaginationSupport findPageByCriteria eJdQ7g[>
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(final DetachedCriteria detachedCriteria){ .=<pU k 3G
return findPageByCriteria ) FsSXnZL
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); %}MM+1eu
} h(K4AiGE
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public PaginationSupport findPageByCriteria yL,B\YCf8
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(final DetachedCriteria detachedCriteria, finalint z{_Vn(Kg
UeTp,
startIndex){ ?=Qg
return findPageByCriteria -B! TA0=oJ
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(detachedCriteria, PaginationSupport.PAGESIZE, O
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startIndex); cSWVHr
} CawVC*b3
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public PaginationSupport findPageByCriteria @AyW9!vV;3
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(final DetachedCriteria detachedCriteria, finalint (S{c*"}2
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pageSize, \Fjq|3`<l
finalint startIndex){ NV ~i4R*#
return(PaginationSupport) M#,+p8
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getHibernateTemplate().execute(new HibernateCallback(){ msJn;(Pn
publicObject doInHibernate ioQlC4Y
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(Session session)throws HibernateException { Sv",E@!f
Criteria criteria = At:C4>HE@
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detachedCriteria.getExecutableCriteria(session); 1z!Lk*C)
int totalCount = 8`<GplO
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((Integer) criteria.setProjection(Projections.rowCount $9$NX/P
TR7TF]itb
()).uniqueResult()).intValue(); $l0w {m!P
criteria.setProjection l0)6[yXK
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(null); wEqCuhZ
List items = 6f1Y:qK'@
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criteria.setFirstResult(startIndex).setMaxResults >@W#@W*I@
XS@6jbLE
(pageSize).list(); A}O9e
PaginationSupport ps = D7wWk
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new PaginationSupport(items, totalCount, pageSize, cFo-NI2
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startIndex); SesO$=y
return ps; Ml
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} w Nnb@
}, true); YzVLa,[
} n`1i k'x?
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public List findAllByCriteria(final 21Opx~T3
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DetachedCriteria detachedCriteria){ Gd 9B
return(List) getHibernateTemplate 0cVXUTJ|W
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().execute(new HibernateCallback(){ l1-FL-1
publicObject doInHibernate MR: {Ps&,
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(Session session)throws HibernateException { F[Up
Criteria criteria = m5*RB1
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detachedCriteria.getExecutableCriteria(session); $Vh82Id^
return criteria.list(); ':@qE\(
} UNae&Zir
}, true); 2sH5<5G'
} X8TZePh
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public int getCountByCriteria(final G@2M&0'
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DetachedCriteria detachedCriteria){ 9IMcp~zX
Integer count = (Integer) X88ZdM'
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getHibernateTemplate().execute(new HibernateCallback(){ FB`HwE<
publicObject doInHibernate Ek6W:Q:@
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(Session session)throws HibernateException { c+c^F/
Criteria criteria = Uyh#g^r
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detachedCriteria.getExecutableCriteria(session); d29HEu
return P^ VNB
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criteria.setProjection(Projections.rowCount |ouk;r24V
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()).uniqueResult(); TgLlmU*qMU
} 8jk*N
}, true); .[!
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return count.intValue(); |iI`p-L9
} OWzIea@
} 82<!b]^1
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用户在web层构造查询条件detachedCriteria,和可选的 Yv)/DsSyL
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ,??|R`S
p%_TbH3j`
PaginationSupport的实例ps。 AKVmUS;70
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ps.getItems()得到已分页好的结果集 Q\Eq(2p
ps.getIndexes()得到分页索引的数组 @{G(.S
ps.getTotalCount()得到总结果数 l;ugrAo?
ps.getStartIndex()当前分页索引 !ibp/:x
ps.getNextIndex()下一页索引 e;$s{CNo
ps.getPreviousIndex()上一页索引 L [^e<I
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 7RZ7q@@fgh
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 AWzpk}\
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一下代码重构了。 M:~#"lfK
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我把原本我的做法也提供出来供大家讨论吧: q)/4i9
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首先,为了实现分页查询,我封装了一个Page类: F=#Wfl-o
java代码: bF.Aj8ZQ
c=5$bo]LI
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/*Created on 2005-4-14*/ AG?oA328
package org.flyware.util.page; 31}6dg8?n
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/** )`)cB)s
* @author Joa 86i =N_
* 0bor/FU-d
*/ t9kgACo/M
publicclass Page { L\UYt\ks
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/** imply if the page has previous page */ u=4Rn
privateboolean hasPrePage; V\_
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A[oRi}=
/** imply if the page has next page */ n1QO/1}
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privateboolean hasNextPage; nm)F tX|A
jH8F^KJM[
/** the number of every page */ >,[(icyzn
privateint everyPage; xn-n{U"
8ViDh
/** the total page number */ "}n]0 >J
privateint totalPage; p(Sfw>t(
FY'f{gD^
/** the number of current page */ 7}Gy%SJ`
privateint currentPage; |Qm 7x[i
?h{ &
/** the begin index of the records by the current 0@
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p)#!
query */ k,?k37%T]
privateint beginIndex; _jtBU
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/** The default constructor */ }}
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public Page(){ Nz m
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} G B15
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/** construct the page by everyPage ]8RcZn
* @param everyPage {h2D}F
* */ J~==<?j:
public Page(int everyPage){ m^wYRA.
this.everyPage = everyPage; qwN-VCj
} oOuWgr]0
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/** The whole constructor */ 7&X^y+bMe6
public Page(boolean hasPrePage, boolean hasNextPage, !Ed';yfz\(
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int everyPage, int totalPage, C&Rv)j
int currentPage, int beginIndex){ qp7>_B
this.hasPrePage = hasPrePage; NJ|8##Z>
this.hasNextPage = hasNextPage; GSk;~^l
this.everyPage = everyPage; o/Z?/alt4
this.totalPage = totalPage; O%)w!0
this.currentPage = currentPage; 6JJ%`Uojh
this.beginIndex = beginIndex; SW bwD/SN
} ]86U-`p
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/** C\1Dy5
* @return X@TQD
* Returns the beginIndex. )s!x)< d;
*/ ]]Wa.P~]O
publicint getBeginIndex(){ =|H/[",gg
return beginIndex; $} ~:x_[
} eOS#@6U=u
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/** !bQ5CB
* @param beginIndex %KqXtc`O
* The beginIndex to set. `*WR[c
*/ u{HB5QqK
publicvoid setBeginIndex(int beginIndex){ 4-sUy
this.beginIndex = beginIndex; t;
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} 'l2`05
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/** Ur_~yX]Mo
* @return cBU>/
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* Returns the currentPage. F$d`Umqs;P
*/ /']Gnt G.
publicint getCurrentPage(){ ?L'ijzP
return currentPage; 2nk}'HBe
} pm^[ve
zg[ksny
/** d]CRvzW
* @param currentPage pVLfZ?78
* The currentPage to set. )wmXicURC
*/ 3HWI;
publicvoid setCurrentPage(int currentPage){ E:#VS~
this.currentPage = currentPage; 7,Nd[
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} k{uc%6s
s2q#D.f
/** p5E|0p
* @return +[:}<^p?cG
* Returns the everyPage. Z>'.+OW
*/ wuI+$?
publicint getEveryPage(){ e:&5Cvx
return everyPage; uYF_sf
} 7n5bI\
Drc\$<9c@
/** iYR8sg[' #
* @param everyPage _.zW[;84b
* The everyPage to set. AfyEFnY
*/ )0YMi!&j`
publicvoid setEveryPage(int everyPage){ N_h)L`
this.everyPage = everyPage; 2UA h^i-^
} flnoK%wi
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/** //g~1(
* @return Vc}m_T]O
* Returns the hasNextPage. hK?uGt
d?
*/ v:eVK!O
publicboolean getHasNextPage(){ B]#0]-ua
return hasNextPage; cW%F%:b
} 0OP6VZ\
t\S}eoc
/** QXniWJJ
* @param hasNextPage [.;VCk)0x
* The hasNextPage to set. EX=Q(} 9F<
*/ u9_ Fjm}&
publicvoid setHasNextPage(boolean hasNextPage){ UJ2Tj+
this.hasNextPage = hasNextPage; u+kXJ
} a8Nl'
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/** 4cl}ouG
* @return ]&jXD=a"
* Returns the hasPrePage. |s+y]3-_
*/ C&D!TR!K
publicboolean getHasPrePage(){ RKx"
}<#+
return hasPrePage; YOd0dKe
} Yc&yv
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/** ,aU_bve
* @param hasPrePage ^3^n|T7le
* The hasPrePage to set. "oz qfh
*/ ^g"G1,[%w
publicvoid setHasPrePage(boolean hasPrePage){ A7C+-N
this.hasPrePage = hasPrePage;
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} +' QX`
ez@`&cJ7
/** lo5,E(7~h
* @return Returns the totalPage. ?Bno?\
* D<$,v(-
*/ g/)mbL>=
publicint getTotalPage(){ fq48>"g*
return totalPage; o+r?N5
} r8A
g:7S/L0]
/** <-D>^p9
* @param totalPage OTY9Q
* The totalPage to set. Usx8
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*/ N`h, 2!(j
publicvoid setTotalPage(int totalPage){
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this.totalPage = totalPage; V>>"nf,YO
} Rt} H.D
#
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} KmG*`Es
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ycz6-kEp
)"`(+Ku&c
Dp3&@M"^yY
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 <l opk('7
P-o/ax
个PageUtil,负责对Page对象进行构造: U-&dn%Sq
java代码: o$)pJ#";F
]%>7OH'
|qnAqzK|
/*Created on 2005-4-14*/ mnh>gl!l
package org.flyware.util.page; ;x^WPYEj
.jA'BF.
import org.apache.commons.logging.Log; WhQK3hnm
import org.apache.commons.logging.LogFactory; >\6Tm
P/6$T2k_
/** SVB> 1s9F
* @author Joa I]+xerVd
* Wn6~x2 LaV
*/ aDceOhfx
publicclass PageUtil { R/Y9t8kk
n;+CV~
privatestaticfinal Log logger = LogFactory.getLog R9@Dd
.0+=#G>
(PageUtil.class); :Aj8u\3!@
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/**
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* Use the origin page to create a new page {Rc mjI7
* @param page o
b;]
* @param totalRecords X67^@~l
* @return Aj#bhv
*/ X$Eg(^L a
publicstatic Page createPage(Page page, int cLhHGwX=x
u5zL;C3O
totalRecords){ 6Y9F U
return createPage(page.getEveryPage(), O=m_P}K
v%a)nv
page.getCurrentPage(), totalRecords); utOATjB.z
} PIOG|E
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/** #@%DY*w]v
* the basic page utils not including exception iXLODuI
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handler {;mT.[
* @param everyPage [.:SV|AF#
* @param currentPage XK#~w:/fB
* @param totalRecords
h.T]J9;9
* @return page q9+`pj
*/ X%JQ_Z
publicstatic Page createPage(int everyPage, int 3<F\5|
', +YWlW
currentPage, int totalRecords){ st4z+$L
everyPage = getEveryPage(everyPage); 3mef;!q
currentPage = getCurrentPage(currentPage); 8[v9|r
int beginIndex = getBeginIndex(everyPage, ZW+M<G
{o>51fXc)
currentPage); b^s978qn#
int totalPage = getTotalPage(everyPage, >I*)0tE
={g.Fn(_
totalRecords); nUb0R~wr$G
boolean hasNextPage = hasNextPage(currentPage, w1;:B%!H
f
wE
b
totalPage); z3-A2#c
boolean hasPrePage = hasPrePage(currentPage); j}s<Pn%4
: ;l9to
returnnew Page(hasPrePage, hasNextPage, yBKEw(1
everyPage, totalPage, s|HpN
currentPage, lB)%s~P:s
_L8|ZV./
beginIndex); "2'4b
} IhR;YM[K
@kh:o\
privatestaticint getEveryPage(int everyPage){ &<dC3o!
return everyPage == 0 ? 10 : everyPage; )}!Z^ND*
} oz8z%*9(
dlv1liSXL5
privatestaticint getCurrentPage(int currentPage){ &,*G}6wa;&
return currentPage == 0 ? 1 : currentPage; Q+<{2oVz
} FT'2J
p9X{E%A<:
privatestaticint getBeginIndex(int everyPage, int r<MW8
[KcF0%a
currentPage){ vD-m FC)
return(currentPage - 1) * everyPage; ;r8<
Ed
} OKo)p`BX
QH>e_
privatestaticint getTotalPage(int everyPage, int #!.26RM:P
*C~$<VYI
totalRecords){ mv,p*0
int totalPage = 0; sh#hDU/</
\:mZ)f3K=
if(totalRecords % everyPage == 0) TKH!,Ow9A
totalPage = totalRecords / everyPage; %>io$ o
else L.ML0H-
totalPage = totalRecords / everyPage + 1 ; ^WF/gup\hS
Q$bi:EyJXc
return totalPage; 1`& Yg(
} Sgp1p}
tRZA`&
privatestaticboolean hasPrePage(int currentPage){ fvE:'( #?
return currentPage == 1 ? false : true; n=F|bW
} <Jc
:a?ICe
%VH{bpS|i:
privatestaticboolean hasNextPage(int currentPage, ?zpN09e
0 k(su
int totalPage){ 8el\M/u{
return currentPage == totalPage || totalPage == uD=FTx
*`]#ntz9
0 ? false : true; x*#9\*@EI
} eo [eN.
U0m 5Rc
\8^c"%v,:
} $eu-8E'
Hd_W5R
j1~'[
0rrNVaM
)JsmzGC0
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。 "/kTEp
w}rsboU
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 <*Bk.>f!
QKHAN{hJ
做法如下: 1F,>siuh ,
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 FW@(MIH
Gnthz0\]{
的信息,和一个结果集List: EEJ OJ<
java代码: 2kSN<jMr
^'G,sZ6'Nh
Vi*HG &DD
/*Created on 2005-6-13*/ (3VV(18
package com.adt.bo; =O
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w,x'FZD
import java.util.List; P1_ZGeom*
S x0QPX
import org.flyware.util.page.Page; 8!XK[zL
ExxD
w_VGT
/** 0!tw)HR%
* @author Joa ~Gj%z+<
*/ !;, Dlq-}
publicclass Result { M5Q7izM
pNNvg,hS8
private Page page; ))xP]Mu v
7x''V5*j
private List content; AuIg=-xR
FoKAF
&h7
/** N<e72x
* The default constructor D.ERt)l>
*/ +:ih`q][b
public Result(){ G~X93J
super(); _I/uW|>
} [XbNZ6
2tqj]i
/** CzfGb4
* The constructor using fields |r<#>~*
* + t7n6
* @param page 7 (kC|q\4M
* @param content _O;2.M%@
*/ hdN[wC]
public Result(Page page, List content){ p*C| kE qk
this.page = page; ;7*R ;/
this.content = content; ^~DDl$NH
} #`o]{UfW
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/** cVf}8qf)
* @return Returns the content. |y$8!*S~(
*/ | k?r1dj%O
publicList getContent(){ i$gH{wn\`
return content; :G[6c5j|V
} `|`Qrv4}
,a'Y^[4k?
/** J^gElp
* @return Returns the page. v[XTH 2
*/ |PxTm
public Page getPage(){ fq<JX5DER
return page; s ;2ih)[
} BI|YaZa+p
.^!<cFkCE
/** TsF>Y""*M
* @param content UfSqiu
* The content to set. =-%10lOI
*/ Kd!.sB/%
public void setContent(List content){ | IB4-p
this.content = content; P}~nL
} cnraNq1
EPiZe-
/** jt`\n1q)
* @param page 60z8U#upM
* The page to set. hCpcX"wND
*/ 05ovz
publicvoid setPage(Page page){ T*{nf
this.page = page; ZwOX ,D
} bnZ~jOHl
} py }`thx
>_|$7m.?n[
4GqwY"ja
?:DUsg
%4,v2K
2. 编写业务逻辑接口,并实现它(UserManager, #5X535'ze
gZ@z}CIw'
UserManagerImpl) 2+=:pc^
java代码: %EEQ^lm
ZG$PW<73~
u:w
/*Created on 2005-7-15*/ {'a|$u+
package com.adt.service; {$QkerW3
~-f"&@){,
import net.sf.hibernate.HibernateException; >K n7A
&>A<{J@VL
import org.flyware.util.page.Page; i_f\dkol
952l1c!
import com.adt.bo.Result; *; :dJXR
oM(8'{S=
/** l4$Iv:
* @author Joa /i)>|U
4
*/ N~|Z@pU"
publicinterface UserManager { CmxQb,Ul s
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public Result listUser(Page page)throws B+2EIaI
+SNjU"x
HibernateException; } /*U~!t
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} @! {Y9k2
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DH Qs_8Df
<O0.q.
I=2b)"t0
java代码: 3|(<]@
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YY4q99^K
/*Created on 2005-7-15*/ -dS@l'$
package com.adt.service.impl; }D[j6+E
nArG
I}@
import java.util.List; s("\]K
ipC
<p?PpR
import net.sf.hibernate.HibernateException; vYg>^!Q
D{rM
import org.flyware.util.page.Page; } 89-U
import org.flyware.util.page.PageUtil; bm poptfL
X]}:WGFM
import com.adt.bo.Result; &embAqW:
import com.adt.dao.UserDAO; k}]M`ad
import com.adt.exception.ObjectNotFoundException; eX'U d%
import com.adt.service.UserManager;
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/** U:0Ma6<
* @author Joa [`kk<$=,&
*/ w+u1"
publicclass UserManagerImpl implements UserManager { NwyNl
/B<QYvv
private UserDAO userDAO; K%ptRj$
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/** dh_c`{9
* @param userDAO The userDAO to set. g OK
*/ $`[TIyA9!
publicvoid setUserDAO(UserDAO userDAO){ DY\~O
this.userDAO = userDAO; GH \
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}
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:-Ml?:0_X
/* (non-Javadoc) [@_W-rA
* @see com.adt.service.UserManager#listUser {fJCj152.
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(org.flyware.util.page.Page) &y&HxV
*/ m/3,;P.6
public Result listUser(Page page)throws #$
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sa TS8p z
HibernateException, ObjectNotFoundException { 14DhJUV"b
int totalRecords = userDAO.getUserCount(); c~+KrWbZ~
if(totalRecords == 0) )=VAEQhL-
throw new ObjectNotFoundException L'w]O
-86
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("userNotExist"); bXSAZWf
page = PageUtil.createPage(page, totalRecords); @'<=EAXe
List users = userDAO.getUserByPage(page); qrf90F)
returnnew Result(page, users); J7Mbv2D
} IN75zn*%
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} ?a-5^{{
k [LV^oEg
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6{quO#!
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其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 )-X/"d
6Yl+IP];i
询,接下来编写UserDAO的代码: oL~?^`cGZ
3. UserDAO 和 UserDAOImpl: Sm{> 8e}UE
java代码: "W~vSbn7
R.cR:fA
>p'{!k
/*Created on 2005-7-15*/ ]!j%Ad
package com.adt.dao; ]T6pH7~
v[r8-0c
import java.util.List; m%=*3gH]&
y,/i3^y#_
import org.flyware.util.page.Page; ]GO=8$Z
[+_>g4M~%
import net.sf.hibernate.HibernateException; 4fL`.n1^
g^^pPVK_
/** 7pou(U
* @author Joa IdM~'
Q>\
*/ >g m
publicinterface UserDAO extends BaseDAO { q[GDK^-g
lQd7p+21
publicList getUserByName(String name)throws T.jCF~%7F
}|%1LL^pB
HibernateException; 6bPl(.(3
0U~*uDU
publicint getUserCount()throws HibernateException; Mi;Pv*
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publicList getUserByPage(Page page)throws AvPPsN0
OJd/#KFm
HibernateException; 9VanR
::XX
2$ &B@\WY
} QIg'js$W
C T\@>!'f
ITg<u?z_
~GcWG4
?(n v_O
java代码: Xdwpn+7s
}=}wLm#&1
|-;VnC&UY
/*Created on 2005-7-15*/ <uxLG;R
package com.adt.dao.impl; On54!m
({Pjz;xM
import java.util.List; P8Wv&5A
Bhv$
import org.flyware.util.page.Page; ^,#my<{
!JyY&D~`
import net.sf.hibernate.HibernateException; ]jYFrOMy4S
import net.sf.hibernate.Query; SZEi+CRs0
.`Q^8|$-K
import com.adt.dao.UserDAO; tbWfm5$
{VKFw=$8
/** !-.GfI:q
* @author Joa OQ-
Hn-H
*/ hf^<lJh~=
public class UserDAOImpl extends BaseDAOHibernateImpl :m(DRD
V$sY3,J7A%
implements UserDAO { ZPyzx\6\
r fzNw
/* (non-Javadoc) Zazff@O *
* @see com.adt.dao.UserDAO#getUserByName P#,;)HF
*yaS^k\
(java.lang.String) :W5W
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*/ &!OEd]
publicList getUserByName(String name)throws dFF=-_O>
,2^4"gIl
HibernateException { eZaSV>27
String querySentence = "FROM user in class I/%v`[
?C#E_
com.adt.po.User WHERE user.name=:name"; GB35o uE
Query query = getSession().createQuery #c5jCy}n
fx(h fz
(querySentence); Pc_aEBq
query.setParameter("name", name); 76wNZv)9
return query.list(); }f]Y^>-Ux
} _'LZf=V0
-(t7>s
/* (non-Javadoc) pF4Z4?W
* @see com.adt.dao.UserDAO#getUserCount() ;8eKAh
*/ __2<v?\
publicint getUserCount()throws HibernateException { P RWb6
int count = 0; Qr9;CVW
String querySentence = "SELECT count(*) FROM y TD4![
fT|A^
user in class com.adt.po.User"; ,/D}a3JD
Query query = getSession().createQuery xC,x_:R`
xEp?|Q$
(querySentence); Dlq!:dF{&
count = ((Integer)query.iterate().next KWZhCS?[(
#<S*MGp!=
()).intValue(); qh:Bc$S
return count; 2lCFE)
} 3f] ;y<Km
QYboX~g~p
/* (non-Javadoc) USEb} M`
* @see com.adt.dao.UserDAO#getUserByPage j/z=<jA
>m>F {v
(org.flyware.util.page.Page) L23}{P
*/ w?8SQI,~X
publicList getUserByPage(Page page)throws ;~EQS.Qp
5$:
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HibernateException { EU %,tp
String querySentence = "FROM user in class ^>?=L\[
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com.adt.po.User"; 3o%vV*
Query query = getSession().createQuery <;6{R#Tuh
{]< G=]'
(querySentence); 8o$rF7.-
query.setFirstResult(page.getBeginIndex()) eHuJFM
.setMaxResults(page.getEveryPage()); /{\ /e"5
return query.list(); I I+y
} l6ym <V(1p
;^5k_\
} motK}G
ch8a
=FrB{Eu
`8ac;b
s*ZE`/SM3
至此,一个完整的分页程序完成。前台的只需要调用 } #rTUX
P[2!D)A
userManager.listUser(page)即可得到一个Page对象和结果集对象 7C|!Wno[;
IT1YF.i
的综合体,而传入的参数page对象则可以由前台传入,如果用 cm(*F0<
C/!.VMl^
webwork,甚至可以直接在配置文件中指定。 4|=>gdW)KN
?vFy3
下面给出一个webwork调用示例: Lwr's'ao.
java代码: ^_;'9YD
wqb4w7%
z3jkxWAZ
/*Created on 2005-6-17*/ l1)~WqhE}
package com.adt.action.user; U!aM63F3
V4n~Z+k
import java.util.List; GtVT^u_
H#~gx_^U
import org.apache.commons.logging.Log; ,~1'L6Ri?
import org.apache.commons.logging.LogFactory; L"qJZU
import org.flyware.util.page.Page; zuV%`n
; :P4~R
import com.adt.bo.Result; 2'DCB{Jv
import com.adt.service.UserService; )l7XZ_gw'
import com.opensymphony.xwork.Action; Vxh39eW
]YgR
/** >fH0>W+!
* @author Joa An{>39{
*/
/MGapmqV9
publicclass ListUser implementsAction{ ]JrD@ Vy
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privatestaticfinal Log logger = LogFactory.getLog |O{N_-];.
&-3e3)
(ListUser.class); K(EJ`2]:r
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private UserService userService; "m K`3</G
N1a]y/
private Page page; gV2vwe
c*;oR$VW
privateList users; "do5@$p|
3iCe5VF
/* S,c{LTL
* (non-Javadoc) 42NfD/"g+s
* L ;L:
* @see com.opensymphony.xwork.Action#execute() c/|{yp$Ga>
*/ *;fTiL
publicString execute()throwsException{ IT| h;NUG
Result result = userService.listUser(page); L4>14D\
page = result.getPage(); q)?%END
users = result.getContent(); ?UtKu
return SUCCESS; A2|Bbqd
} KD kGQh#9
V<QpC5
/** )|~&(+Q?]
* @return Returns the page. }r:"X<`
*/ B\J[O5},
public Page getPage(){ +
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return page; e~]P _53
} sL$sj|" S
p&(0e,`z/
/** uY]';OtG
* @return Returns the users. :Y99L)+=/
*/ &}"kF\
publicList getUsers(){ X+4Uh
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return users; 9@*pC@I)
} h4hAzFQ.s
?"yjgt7+y
/** !j6k]BgZ
* @param page s41%A2Enh
* The page to set. <Wn~s=
*/ suN6(p(.
publicvoid setPage(Page page){ G\sx'#Whc
this.page = page; 2{ F-@}=
} |]&3*%b@
LJeq{Z
/** #{6VdWZ
* @param users 7X$CJ%6b
* The users to set. iC#a+G*N_M
*/ 1)z'-dQ-5$
publicvoid setUsers(List users){ f(Xin3#'
this.users = users; +~5Lo'^
} o?a2wY^_
L4 po1
/** 0~nX7
* @param userService Ua}R3^_)a
* The userService to set. x6/u+Urn
*/ OxJHhF
publicvoid setUserService(UserService userService){ `wi+/^);
this.userService = userService; f7&ni#^Ztj
} $<-a>~^Tp
} OLG)D#m(4/
i+`8$uz
,a5q62)q
nAP*w6m0j
K_MEd1l
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, g2f"tu_/%
(Yy#:r;U
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 +Z"Wa0wA
dpW`e>o
么只需要: upMs yLp(
java代码: Y1Ql_
)u(,.O[cw
r*{.|>me
<?xml version="1.0"?> 7{r7
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork ~BI`{/O=
}hn?4ny
1.0//EN" "http://www.opensymphony.com/xwork/xwork- /[/L%;a'p
#'/rFT4{v
1.0.dtd"> =ls+vH40&
}0&Fu?sP
<xwork> gbdzS6XW~
|E6Thvl$
<package name="user" extends="webwork- Ox)<"8M
%s}{5Qcl/
interceptors"> LuRCkKJ
X!hzpg(`hR
<!-- The default interceptor stack name =sWK;`
'l<#;{
--> 7^>~k}H
<default-interceptor-ref H ezbCwsx&
U%Fa.bL~
name="myDefaultWebStack"/> P,8TO-e7
&DW !$b
<action name="listUser" _#~D{91
j:
H7uh"/A
class="com.adt.action.user.ListUser"> HDhkg-QC
<param PVi;h%>Y
%|4Kak]:Q
name="page.everyPage">10</param> 3X Y"s"
<result UK6x]tE
_E9[4%f
name="success">/user/user_list.jsp</result> ;-JF1p 7;
</action> 7b~uU@L`
m2m
;|rr
</package> ,tXI*R
-medD G
</xwork> `{ Ox=+]M
c{kpgN
LTf)`SN %'
C#[P<= v
vAP1PQX;
b|V<Kp
这样就可以通过配置文件和OGNL的共同作用来对page对象设置初值 y:E$n!
Q0-gU+ig
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。 U^}7DJ
?*
+>T@MH
注:上面的<param>的配置,还需要webwork和Spring整合的配合。 k/F#-},Q.
R.1.LB
#y&5pP:@
y /vc\e
otaRA
我写的一个用于分页的类,用了泛型了,hoho zZd.U\"2
_k}Qe;
java代码: B|o@|zF
J<0sT=/2$
QUkP&