Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 :B~c>:
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 w4a7c
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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 ]9Hy
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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 ba13^;fm#
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分页支持类: ^cm^JyS)
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java代码: |e\%pfZ
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package com.javaeye.common.util; wQT'~'kL
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import java.util.List; -yeT $P&|
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publicclass PaginationSupport { @Rm/g#!h"
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publicfinalstaticint PAGESIZE = 30; -wB AFr
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privateint pageSize = PAGESIZE; wG
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privateList items;
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privateint totalCount; +Sfv.6~v
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privateint[] indexes = newint[0]; *rLs!/[Z_
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privateint startIndex = 0; *C \O]r:'
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public PaginationSupport(List items, int 8T4J^6
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totalCount){ (yfTkBy
setPageSize(PAGESIZE); rzu^br9X
setTotalCount(totalCount); Ju<D7
setItems(items); {\B!Rjt[T
setStartIndex(0); ]NCOi?Odx
} :"4~VDu
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public PaginationSupport(List items, int duI8^&|
@lwqkJ
totalCount, int startIndex){ a|.u;
setPageSize(PAGESIZE); |NI0zd
setTotalCount(totalCount); < -Nj
setItems(items); Gkl#s7'
setStartIndex(startIndex); VI?[8@*Z
} ze-iDd_y
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public PaginationSupport(List items, int ]9' \<uR
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totalCount, int pageSize, int startIndex){ 6XP>p$-
setPageSize(pageSize); ZU`"^FQ3A
setTotalCount(totalCount); =["GnL*!0
setItems(items); /SiQw7yp%
setStartIndex(startIndex); $)U
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} STI8[e7{
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publicList getItems(){ _#+i;$cO-X
return items; y.zW>Mfl
} (~jOtUyT
jzQgDed ]
publicvoid setItems(List items){ +mJAIjH
this.items = items; Rh=h{O
} :z[SI{Y
s[hD9$VB>
publicint getPageSize(){ q
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return pageSize; m*1=-"P
} hYLu
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publicvoid setPageSize(int pageSize){ #u~8Txt
this.pageSize = pageSize; )lZb=t
} b{A#P?
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publicint getTotalCount(){ (j(6%U
return totalCount; -{dwLl_
} n}"MF>zDK
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publicvoid setTotalCount(int totalCount){ "zugnim
if(totalCount > 0){ ujaaO6oZ7
this.totalCount = totalCount; >B==*,|
int count = totalCount / J(0c#}d
dP82bk/e
pageSize; =dPrG=A
if(totalCount % pageSize > 0) bS*9eX=K
count++; bFcI\Q{4
indexes = newint[count]; 8{AzB8xp
for(int i = 0; i < count; i++){ a$ Z06j
indexes = pageSize * L~\Ir
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i; E;yP.<PW
} YtFtU;{
}else{ zFlW\wc
this.totalCount = 0; 2TdcZ<k}J
} _di[PU=Vh
} cY5h6+ _
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publicint[] getIndexes(){ flRok?iF
return indexes; BPW2WSm@<
} Wh,p$|vL
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publicvoid setIndexes(int[] indexes){ "5=Gu1
this.indexes = indexes; ~OXPn9qPp
} Mp}U>+8
}5EvBEv-)
publicint getStartIndex(){ J%{>I
return startIndex; F.4xi+S_
} 0`:0m/fsU
R,8;GS42
publicvoid setStartIndex(int startIndex){ H>%K}Fh
if(totalCount <= 0) ta%yQd7
this.startIndex = 0; (V&$KDOA
elseif(startIndex >= totalCount) U`z=!KI+g
this.startIndex = indexes
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[indexes.length - 1]; f<<1.4)oSV
elseif(startIndex < 0) R10R,*6>
this.startIndex = 0; -a !?%
else{ ]v=A}}kS
this.startIndex = indexes @kd`9Yw
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[startIndex / pageSize]; 0-6rIdDTM
} {{qu:(_g
} n86LU Sj5
#ozui-u>
publicint getNextIndex(){ LtW}R4}3
int nextIndex = getStartIndex() + T,r?% G{XE
Q\rf J||
pageSize; h/k00hD60
if(nextIndex >= totalCount) kntYj}F(
return getStartIndex(); A`71L V%
else t^
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return nextIndex; |0OY>5
} LGB}:;$AL
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publicint getPreviousIndex(){ ||D PIn]
int previousIndex = getStartIndex() - 42M_ %l_
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pageSize; 5:|9pe)
if(previousIndex < 0) `3g5n:"g\
return0; [n4nnmM
else F_G .$aCc
return previousIndex; agt/;>q\~
} 1%ENgb:8
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} dIW@L
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抽象业务类 S4\a"WYg
java代码: tq}MzKI*
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/** !0dQfj^_
* Created on 2005-7-12 ^hXm=r4ozR
*/ EQN)y27poW
package com.javaeye.common.business; hC[=e`j
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import java.io.Serializable; 9U8x&Z]P
import java.util.List; 3\2%i6W6
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import org.hibernate.Criteria; "AU.Eh"-1
import org.hibernate.HibernateException; yts@cd`$
import org.hibernate.Session; p[w! SR%=
import org.hibernate.criterion.DetachedCriteria; )9^)t
import org.hibernate.criterion.Projections; Q 9fK)j1$
import <rtKPlb//
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org.springframework.orm.hibernate3.HibernateCallback; ^3[_4av
import GF6 o
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org.springframework.orm.hibernate3.support.HibernateDaoS MA,*$BgZ
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upport; .u>[m.
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import com.javaeye.common.util.PaginationSupport; 1~ W@[D
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public abstract class AbstractManager extends cef[T(>
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HibernateDaoSupport { t5%cpkgh4
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privateboolean cacheQueries = false;
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privateString queryCacheRegion; K fD.J)
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publicvoid setCacheQueries(boolean j1KNgAo<4
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cacheQueries){ H,]8[qT<
this.cacheQueries = cacheQueries; YZ5,K6u
}
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publicvoid setQueryCacheRegion(String Iz1x| EQ
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queryCacheRegion){ >*RU:X
this.queryCacheRegion = sSZ)C|Q
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queryCacheRegion; ]:OrGD"
} c`soVqT$?
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publicvoid save(finalObject entity){ sSh{.XuB+3
getHibernateTemplate().save(entity); nd]SI;<
} qtExd~E
y6nP=g|')>
publicvoid persist(finalObject entity){ T9
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getHibernateTemplate().save(entity); sq!$+=1-X
} C3}:DIn"w
@khFk.LBD
publicvoid update(finalObject entity){ 1Ng+mT
getHibernateTemplate().update(entity); `G qe]ZE#"
} ^ +SE_ -+]
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publicvoid delete(finalObject entity){ Y~AjcqS
getHibernateTemplate().delete(entity); 5dm ~yQN/
} V4+|D2
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publicObject load(finalClass entity, ;=y"Z^
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finalSerializable id){ f' ?/P~[
return getHibernateTemplate().load &"^F;z/
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(entity, id); I8Aq8XBw
} lI<jYd
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publicObject get(finalClass entity, U?UU]>Q
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finalSerializable id){ cLV*5?gVO
return getHibernateTemplate().get G&ck98
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(entity, id); $ln8Cpbca
} =rA?,74
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publicList findAll(finalClass entity){ :C:6bDQ
return getHibernateTemplate().find("from G?s9c0f
xDo0bR(
" + entity.getName()); Q;]JVT1
} 2 ? qC8eC
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publicList findByNamedQuery(finalString mtmC,jnD
)9hqd
namedQuery){ j'D%eQI,V
return getHibernateTemplate ,8e'<y
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().findByNamedQuery(namedQuery); !*-|!Vz
} @G4Z
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publicList findByNamedQuery(finalString query, `
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finalObject parameter){ )x6&Y
return getHibernateTemplate e9{ii2M
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().findByNamedQuery(query, parameter); -8 uS#
} q3x"9i
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publicList findByNamedQuery(finalString query, $e\s8$EO
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finalObject[] parameters){ vNSUrf,r
return getHibernateTemplate }j/\OY _&
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().findByNamedQuery(query, parameters); 3Bl|~K;-
} JWNN5#=fQ
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publicList find(finalString query){ E=I'$*C\D
return getHibernateTemplate().find ~O}r<PQ
?MH=8Cl1w
(query); $MR1
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} @NM0ILE
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publicList find(finalString query, finalObject A[l
)>:
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parameter){ A?MM9Y}K
return getHibernateTemplate().find &{Z+p(3Gj
z qA>eDx
(query, parameter); #(tdJ<HvC|
} <Y`(J#
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public PaginationSupport findPageByCriteria 7m#EqF$P
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(final DetachedCriteria detachedCriteria){ x// uF
return findPageByCriteria Zf$mwRS[_
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Ce+:9} [
} cxR.:LD}
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public PaginationSupport findPageByCriteria ep8UWxB5
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(final DetachedCriteria detachedCriteria, finalint }XUL\6 U
LVUA"'6V
startIndex){ vd%AV(]<LJ
return findPageByCriteria ^li3*#eT
6$OmOCA%
(detachedCriteria, PaginationSupport.PAGESIZE, >a975R*g
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startIndex); y{M7kYWtHV
} Kb]}p
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public PaginationSupport findPageByCriteria GJdL1ptc
]\rQ{No
(final DetachedCriteria detachedCriteria, finalint
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pageSize, ?$`kT..j,u
finalint startIndex){ (g@X.*c8
return(PaginationSupport) f
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getHibernateTemplate().execute(new HibernateCallback(){ H`M|B<.
publicObject doInHibernate #|T"6jJaQ
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(Session session)throws HibernateException { )&E]
Criteria criteria = =oVC*b
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detachedCriteria.getExecutableCriteria(session); 8AW}7.<5
int totalCount = ^P{y^@XI
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((Integer) criteria.setProjection(Projections.rowCount h1?xfdvGd
mxEe
-q
()).uniqueResult()).intValue(); K bQXH!J
criteria.setProjection vJs6nVbK
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(null);
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List items = '__>M>[
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criteria.setFirstResult(startIndex).setMaxResults rI\5djiYJ
Jqzw94
(pageSize).list(); r<kgYU`
PaginationSupport ps = q~#>MB}".
<r <{4\%}
new PaginationSupport(items, totalCount, pageSize, 8g:VfzaHu
&*o4~6pQ#
startIndex); V5-!w0{
return ps; WI&A+1CK-5
} dLGHbeZ[(
}, true); NA$)qX_
} tJ_Y6oFm=
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public List findAllByCriteria(final y=pW+$k
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DetachedCriteria detachedCriteria){ [(a3ljbRX
return(List) getHibernateTemplate iz;5:
Kn3Xn`P?
().execute(new HibernateCallback(){ O*/%zr
publicObject doInHibernate ?7pn%_S
ZD]{HxGL!
(Session session)throws HibernateException { yp4[EqME
Criteria criteria = VOC$Kqg;
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detachedCriteria.getExecutableCriteria(session); @"h4S*U
return criteria.list(); Z,AY<[/C
} vN
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}, true); )2wf D
} U/PNEGuQ
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public int getCountByCriteria(final L|<j/bP
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DetachedCriteria detachedCriteria){ $DfK}CT
Integer count = (Integer) \IC^z
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getHibernateTemplate().execute(new HibernateCallback(){ h}'Hst
publicObject doInHibernate a_/4 ^+
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(Session session)throws HibernateException { ?7)v:$(G}
Criteria criteria = )uAY_()/
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detachedCriteria.getExecutableCriteria(session); XPf{R619
return _1Rw~}O
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criteria.setProjection(Projections.rowCount K_ymA,&()
l d#x'/
()).uniqueResult(); ZJcX-Z!\
} N LQ".mM+
}, true); #?r|6<4X
return count.intValue(); Nz3+yxv1
} KwMt@1Z
} t}I@Rmso
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用户在web层构造查询条件detachedCriteria,和可选的 @i(9k
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 V;R gO}
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PaginationSupport的实例ps。 iex%$> "
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ps.getItems()得到已分页好的结果集 $X-PjQb1Bb
ps.getIndexes()得到分页索引的数组 4qE4 i:b
ps.getTotalCount()得到总结果数 o~y{9Q
ps.getStartIndex()当前分页索引 JAjiG^]
ps.getNextIndex()下一页索引 gQSVPbzK
ps.getPreviousIndex()上一页索引 ;*zLf 9i
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Go:(R {P
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Q
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 CDtL.a\
Y~I>mc]
一下代码重构了。 }OnU32P
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我把原本我的做法也提供出来供大家讨论吧: OW=3t#"7Kp
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首先,为了实现分页查询,我封装了一个Page类: b@4UR<
java代码: Z/: yYSq
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/*Created on 2005-4-14*/ !wd
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package org.flyware.util.page; e~)4v
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/** i83Jy w,f
* @author Joa W[`ybGR<
* [];wP'*
*/ E]&N'+T
publicclass Page { 9'~qA(=.?
:+QNN<
/** imply if the page has previous page */ bxxLAWQ(
privateboolean hasPrePage; euT=]j
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/** imply if the page has next page */ 6ZI7V!k
privateboolean hasNextPage; By!u*vSev
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/** the number of every page */ ,Iz9!i
J"
privateint everyPage; n{<@-6
q3/4l%"X
/** the total page number */ : Gi8Jo
privateint totalPage; =z9,=rR4
?RG;q
/** the number of current page */ CiHx.5TiC
privateint currentPage; mP15PZ
t'W6Fmwkx
/** the begin index of the records by the current qR2cRepV
&``nD
query */ IN1n^f$:
privateint beginIndex; >#mKM%T2MJ
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/** The default constructor */ >zJk G9a
public Page(){ <T.R%Jys
t W
} 6OC4?#96%'
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/** construct the page by everyPage }>y~P~`S:
* @param everyPage BBX/ &d8n
* */ (kK8
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public Page(int everyPage){ p*cyW l
this.everyPage = everyPage; UDJ#P9uy
} l1 08.ao
JDnWBE V
/** The whole constructor */ {nA+-=T
public Page(boolean hasPrePage, boolean hasNextPage, ;*Y+. ?>a
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*Y53bZ
int everyPage, int totalPage, =r`E%P:
int currentPage, int beginIndex){ O@HD'
this.hasPrePage = hasPrePage; !m_y@~pV#u
this.hasNextPage = hasNextPage; SU7,uxF
this.everyPage = everyPage; y\iECdPU
this.totalPage = totalPage; -2U|G
this.currentPage = currentPage; i+I.>L/S
this.beginIndex = beginIndex; 1,Pg^Xu
} d--6<_q
D2MIV&pahP
/** <Z]j89wzDZ
* @return T|YMU?4
* Returns the beginIndex. 4_CXs.v1
*/ LG(" <CU
publicint getBeginIndex(){ )r*F.m{&:
return beginIndex; )&)tX.
} Y3)*MqZlF
yG# x*\9
/** ]wbV1Y"
* @param beginIndex XL1x8IB
* The beginIndex to set. mv*M2NuhT
*/ &;vMJ
publicvoid setBeginIndex(int beginIndex){ ]nxSVKE4p
this.beginIndex = beginIndex; [zrFW
g6N
} 8jky-r
$9Xn.,W
/** 7Z}T!HFMr
* @return yWH!v]S
* Returns the currentPage. V3
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*/ AQ"rk9Z
publicint getCurrentPage(){ Qq.Ja%Zq
return currentPage; _w5c-\-PUM
} =G 'c %
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/** N_0B[!B]
* @param currentPage >8`;SEnv
* The currentPage to set. =|
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lx
*/ X4bZ4U*
publicvoid setCurrentPage(int currentPage){ PP6gU=9[)
this.currentPage = currentPage; gb^'u
} VW] ,R1q
&D7Mv5i0@
/** r8_MIGM'
* @return ,nniSG((3
* Returns the everyPage. &c=
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*/ 8tT/w5
publicint getEveryPage(){ a7z%)i;Z
return everyPage; #J$z0%P
} z Hl+P*)
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/** s*e1m%
* @param everyPage AD'c#CT
* The everyPage to set. WsmP]i^Q
*/ SXV
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publicvoid setEveryPage(int everyPage){ m]VOw)mBF
this.everyPage = everyPage; t1o_x}z4.
} q:,ck@-4
7C@m(oK
/** MnW"ksH
* @return S"Ag7i
* Returns the hasNextPage. cN:ek|r
*/ R+=Xr<`%U|
publicboolean getHasNextPage(){ 6#2E {uy;R
return hasNextPage; ~:UAL}b{\~
} HwBJUr91]
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/** *iVv(xXgN
* @param hasNextPage kE{-h'xADD
* The hasNextPage to set. YD;"_yH
*/ o5w =
publicvoid setHasNextPage(boolean hasNextPage){ |
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this.hasNextPage = hasNextPage; %Q5
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} S\A9r!2
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/** ,@@FAL
* @return N8`q.;qewz
* Returns the hasPrePage. U{0!
<*W>
*/ @9h6D<?
publicboolean getHasPrePage(){ ^A t,x
return hasPrePage; I oC}0C7
} wB%;O `Oh
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/** 8G_KbS
* @param hasPrePage WeS$$:ro
* The hasPrePage to set. 20BU;D3
*/ 7V;wCm#b
publicvoid setHasPrePage(boolean hasPrePage){ 6w$pL(
this.hasPrePage = hasPrePage; h1Q rFPQnu
} Ccy0!re
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/** >Te h ?P
* @return Returns the totalPage. NvjKB)J
* {'q(a4
*/ a^Lo;kHY
publicint getTotalPage(){ 3rVWehCv
return totalPage; ~&Y%yN^
} P&9&/0r=_
'FmnlC1
/** \t' ]Lf
* @param totalPage >I*uo.OF
* The totalPage to set. \Qe`>nA
*/ ~#9(Q
publicvoid setTotalPage(int totalPage){ E'F87P ^>
this.totalPage = totalPage;
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} ]s^Pw>/`
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} Iq:
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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 =F90SyzTy
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个PageUtil,负责对Page对象进行构造: OE_A$8L
java代码: jmh$6 N%
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/*Created on 2005-4-14*/ fs%l j_t
package org.flyware.util.page; 9|1J pb
ub=Bz1._
import org.apache.commons.logging.Log; g)Dg=3+>
import org.apache.commons.logging.LogFactory; ZH8Oidj`
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/** 5Ak6 q(\
* @author Joa cXG$zwS\
* ,lr\XhO
*/ >p@v'h/Cr
publicclass PageUtil { Jx4"~ 4
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privatestaticfinal Log logger = LogFactory.getLog -@yu 9=DT
)0p7d:%mV
(PageUtil.class); },(Ln%M
yOXL19d@p_
/** (SGU]@)g
* Use the origin page to create a new page x#,nR]C
* @param page yUp"%_t0
* @param totalRecords <c$K3
* @return %:hU:+G E
*/ J}3 7 9
publicstatic Page createPage(Page page, int eIY![..J/N
$3Srr*
totalRecords){ :ZP`Y%dt'
return createPage(page.getEveryPage(), ,CA3Q.y>|
_vgFcE~E@
page.getCurrentPage(), totalRecords); j9]H~:g$d
} z;d]=PT
leomm+f^
/** hj|P*yKV
* the basic page utils not including exception etkKVr;Kv
&['cZ/bM
handler t
(>}
* @param everyPage Dhy@!EOS
* @param currentPage _k2*2db
* @param totalRecords ?ta(`+"
* @return page oD>j26Q
*/ {X'D07 q
publicstatic Page createPage(int everyPage, int 8*t8F\U#
OD\F*Ry~
currentPage, int totalRecords){ &]mZp&
everyPage = getEveryPage(everyPage); Zr
U9oy&!C
currentPage = getCurrentPage(currentPage); Q1?09
int beginIndex = getBeginIndex(everyPage, <qpDAz4k
g<&n V>wF
currentPage); vsL)E:0
int totalPage = getTotalPage(everyPage, G(6MLh1
C/L+gU&
totalRecords); Yf=Puy}q
boolean hasNextPage = hasNextPage(currentPage, ;)nV
//_aIp
totalPage); sq~9
l|F
boolean hasPrePage = hasPrePage(currentPage); q V+gQ
L 2k?Pl
returnnew Page(hasPrePage, hasNextPage, 2Yt+[T*
everyPage, totalPage, .3JLa8y
currentPage, !uwZ%Uxz
uO,9h0y0W
beginIndex); tUPdq 0%t[
} QFS5PZ
E0o?rgfdq
privatestaticint getEveryPage(int everyPage){ ~7}aW#
return everyPage == 0 ? 10 : everyPage; 2a3RRP
} 3w-0IP]<
tDk !]
privatestaticint getCurrentPage(int currentPage){ =KctAR;
return currentPage == 0 ? 1 : currentPage; |{a`,%mw
} QxaW
x
#OT8_D
privatestaticint getBeginIndex(int everyPage, int /P>t3E2c
:4V8Iz 71
currentPage){ +=Q/'g
return(currentPage - 1) * everyPage; R
rtr\a
} qP}187Q1
8o SNnT
privatestaticint getTotalPage(int everyPage, int z9B""ws
?"o7x[
totalRecords){ % >\v6ea
int totalPage = 0; >&z=ktB
=5v=<, ]
if(totalRecords % everyPage == 0) */7+pk(
totalPage = totalRecords / everyPage; Tt.#O~2:9
else {Hu@|Q\~&
totalPage = totalRecords / everyPage + 1 ; <V~B8C!)
~7$4w# of0
return totalPage; ~Gz
b^
} 8NJxtT~0c~
*@zh
privatestaticboolean hasPrePage(int currentPage){ +[R,wsG
return currentPage == 1 ? false : true; ,@#))2<RK
} DN GXp5I
+p
Y*BP+~i
privatestaticboolean hasNextPage(int currentPage, |*T3TsP u
~g|Z6-?4Jj
int totalPage){ RiPxz=kr
return currentPage == totalPage || totalPage == !)1gGXRY
M:9
6QM~
0 ? false : true; {%"n[DLps
} '[z529HN
Q/[g|"
R'udC}
} @|jLw($Ly
PXRkK63
a
At<36{?
)#H&lH
T.}wcQf&*
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。 e@ mjh,
*:+&SxL
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 X^td`}F/=V
C;UqLMrOI
做法如下: WP5QA8`3
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 0eP ]
3hi0
的信息,和一个结果集List: j+9;Cp]N V
java代码: `Nnaw+<]
=1vl-*uYh
WEnI[JGe
/*Created on 2005-6-13*/ U{JD\G8m
package com.adt.bo; FoNkISzW
~v$1@DQ}
import java.util.List; ,Hzz:ce
2lc
import org.flyware.util.page.Page; w1&\heSQ
WCdl 25L#
/** o
_G,Ph!7
* @author Joa aWCZ1F
*/ M&v;#CV
publicclass Result { C+m%_6<
zFba("E Z
private Page page; %2;Nj;
J$
@|2L>N
private List content; 4!</JZX~$
bih%hqny
/** dKk#j@[n"
* The default constructor N*w6D:
*/ nr{#Krkb
public Result(){ @CTSvTt$
super(); 0ap_tCY
} ].Sz2vI
a7fFp9l!
/** LJc"T)>$`
* The constructor using fields +v.<Fw2k#
* 1o8C4?T&
* @param page VRs|";
* @param content m}$7d5
*/ 3!u`PIQv
public Result(Page page, List content){ _t/~C*=:=
this.page = page; !0Mx Bem
this.content = content; \GD\N=?~
} 4aGVIQ
f|'0FI
/** \V_Tc`
* @return Returns the content. (k^o[H F
*/ Nrn_Gy>|D
publicList getContent(){ &E+mXEve
return content; WbWEgd%8.
} {zTnE?(o`
A`:a
T{j
/** }ip3d m
* @return Returns the page. W;T5[
*/ i,B<k 0W9
public Page getPage(){ mz|p=[lR|
return page; @g5qcjD'[
} x:6c @2
$3=S\jyfK
/** 9Wv}g"KY0
* @param content NXCvS0/h
* The content to set. DS1{~_>nFu
*/ !+u
K@z&G
public void setContent(List content){ +P=IkbxAO
this.content = content; Z0[d;m*
} 4:9N]1JCb
NZ"nG<;5
/** Gsu?m
* @param page b+CJRB1
* The page to set. 2e9.U/9
*/ b]gVZ-
publicvoid setPage(Page page){ a*&(cn
this.page = page; KL yI*`
} neQ~h4U"
} bXi!_'z$
Xp.$FJ1)
`W:z#uNG]
+BVY9U?\"
TM5 Y(Q*
2. 编写业务逻辑接口,并实现它(UserManager, );zLgNx,
!nsx!M
UserManagerImpl) 3
"iBcsLn
java代码: a4[t3U
%Gl1Qi+Po_
jV[;e15+
/*Created on 2005-7-15*/ >6R3KJe
package com.adt.service; f`)*bx
oY+p;&H
import net.sf.hibernate.HibernateException; _X|prIOb=
6e8 gFQ"w2
import org.flyware.util.page.Page; S=gby
G
c\^Kg^#
import com.adt.bo.Result; &f}w&k2yj
2M*i'K;;)P
/** !S%0#d2
* @author Joa 'b0r?A~c=
*/ l/,la]!T
publicinterface UserManager { jfiUf1Mj
!1=*"H%t
public Result listUser(Page page)throws z-qbe97
\%7fm#z6
HibernateException; zn>+\
YS#*#!ZMn?
} @mJ~?d95v
7{]dh+)
1BEs> Sm
b50mMWtG
Vef!5]t5
java代码: P@keg*5@
u>]3?ty`
yVgC1-8i*
/*Created on 2005-7-15*/ Y!8FW|
package com.adt.service.impl; *:Rs\QH
aU~?&]
import java.util.List; O5aXa_A_u
#%2 d;V
import net.sf.hibernate.HibernateException; X i1|%
T@=C2
1
import org.flyware.util.page.Page; c-PZG|<C[
import org.flyware.util.page.PageUtil; ``P9fd
4g"%?xN
import com.adt.bo.Result; BM/o7%]n
import com.adt.dao.UserDAO; aG83@ABx
import com.adt.exception.ObjectNotFoundException;
q"
f65d4c
import com.adt.service.UserManager; ,:e~aG,B
xnt) 1Q
/** uDP:kM
* @author Joa e`S\-t?Z
*/ DnFzCJ
publicclass UserManagerImpl implements UserManager { F3EAjO)ch
Y X^c}t}U
private UserDAO userDAO; jLVG=rOn
vUVFW'-
/** L2,2Sn*4i
* @param userDAO The userDAO to set. q~b# ml2QS
*/ 4`,7tj
publicvoid setUserDAO(UserDAO userDAO){ W~0rSVD$<z
this.userDAO = userDAO; X!qK[b@Z
} 8W{M}>;[9
K<wFr-z
/* (non-Javadoc) mmbe.$73
* @see com.adt.service.UserManager#listUser (0H=f6N
jwT` Z
(org.flyware.util.page.Page) A4!X{qUT-
*/ zXx/\B$&d*
public Result listUser(Page page)throws }q`9U!v
<@"rI>=
HibernateException, ObjectNotFoundException { \0x>#ygX
int totalRecords = userDAO.getUserCount(); _i}b]xfM
if(totalRecords == 0) {#qUZ z-
throw new ObjectNotFoundException 0#9H;j<Op
}[;ZZm?
("userNotExist"); [j-?)
page = PageUtil.createPage(page, totalRecords); /iFn=pk1?
List users = userDAO.getUserByPage(page); s|e.mZk/
returnnew Result(page, users); "D
_r</b
} K2zln_W
B=TUZ)
} M; wKTTQy
|y U!d
%
A.vAk''(}+
EL$DvJ~
d\JaYizp
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 S-S%IdL
x 4+WZYv3
询,接下来编写UserDAO的代码: 5G}4z>-]F)
3. UserDAO 和 UserDAOImpl: ZLT?G
java代码: \Nt
5TG_
X$>F78e*
|O_JUl
/*Created on 2005-7-15*/ k9}8xpH
package com.adt.dao; v1,#7sAW'
fWmc$r5n](
import java.util.List; H54RA6$>
x
vs=T
import org.flyware.util.page.Page; gB'ajX=OA/
09-8Xzz
import net.sf.hibernate.HibernateException; 5v)^4(
)
i wgt\ux.
/** 1?Y>Xz
* @author Joa #"N60T@
*/ yjjq&Cn
publicinterface UserDAO extends BaseDAO { {$z54nvw$
5G`HJ6
publicList getUserByName(String name)throws 4=^_VDlpd
8gP1]xD
HibernateException; '5BD%#[
r tuaU=U
publicint getUserCount()throws HibernateException; KV_/fa~Ry
G?$@6
publicList getUserByPage(Page page)throws ]@#9B>v=
kkq1:\pZ]a
HibernateException; >9{?]x
%]4Tff
} ~bZ$ d{o^
4aS}b3=n
(bb!VVA
^X96yj'?
VmqJMU>.
java代码: .^wpfS
n5$#M
L
BbST!
/*Created on 2005-7-15*/ :0r,.)
package com.adt.dao.impl; Pf[E..HF*d
A<+Dx
import java.util.List; ?@rd,:'dE
{XOl &
import org.flyware.util.page.Page; '0HOL)cIz
= QBvU)Ki
import net.sf.hibernate.HibernateException; oPKLr31zt
import net.sf.hibernate.Query; w5%Yi{
v)+g<!
import com.adt.dao.UserDAO; (.4lsKN<
).71gp@&
/** Pu3oQDldV
* @author Joa uN`/&_$c
*/ 7zG
r+Px
public class UserDAOImpl extends BaseDAOHibernateImpl g+#awi7
["3dr@T9Z
implements UserDAO { %>m.Z#R(
pQiC#4b
/* (non-Javadoc) ;xwcK-A
* @see com.adt.dao.UserDAO#getUserByName @ZJL]TO
{,%&}kd>
(java.lang.String) &D<R;>iI
*/ 1wR[nBg*|
publicList getUserByName(String name)throws aZmN(AJ8v
WE) *~5
HibernateException { ,CqWm9
String querySentence = "FROM user in class 83vMj$P
Cab.a)o
com.adt.po.User WHERE user.name=:name"; al2lC#Sy
Query query = getSession().createQuery (tg.]q_=u
^FLs_=E
(querySentence); 4LTm&+(5
query.setParameter("name", name); ~IhM(Q*mO!
return query.list(); _*o<<C\E
} Z*k(Q5&U
JN
wI{
/* (non-Javadoc) Lwl1ta-
* @see com.adt.dao.UserDAO#getUserCount() t%}<S~"
*/ _WEJ,0*#'
publicint getUserCount()throws HibernateException { ,6>3aD1w~q
int count = 0; '[#y|
String querySentence = "SELECT count(*) FROM h3@tZL#g
s47R,K$
user in class com.adt.po.User"; EZ<:>V-_D
Query query = getSession().createQuery >PA*L(Dh%
&s".hP6
(querySentence); !UoA6C:
count = ((Integer)query.iterate().next ?#z$(upQ
So1TH%
()).intValue(); <st<oR'
return count;
(=!At)O
} a`'>VCg
d0>U-.
/* (non-Javadoc) h*fN]k6
* @see com.adt.dao.UserDAO#getUserByPage CP7Fe{P
F'K >@y
(org.flyware.util.page.Page) NW[K/`-CTH
*/ jSp&\Wj b
publicList getUserByPage(Page page)throws M{jXo%C
H^-Y]{7
HibernateException { ogFo/TKM
String querySentence = "FROM user in class H\>{<`sD;f
Jw]!x1rF~
com.adt.po.User"; "KIY+7@S}
Query query = getSession().createQuery h?xgOb!4
!)]/?&uo
(querySentence); rCw4a?YS
query.setFirstResult(page.getBeginIndex()) G=cRdiy`C
.setMaxResults(page.getEveryPage()); pq)
=
return query.list(); 3;v)f": [
} (7g"ppf
v[
iJ(C_
} AY52j
\*t\=4
b=EI?XwJ
d_`MS@2
d ~M;
至此,一个完整的分页程序完成。前台的只需要调用 {bXN[=j
Jq0sZ0j
userManager.listUser(page)即可得到一个Page对象和结果集对象 GKoYT{6
qraXAQ
的综合体,而传入的参数page对象则可以由前台传入,如果用 p(RF
J&aN6 l?
webwork,甚至可以直接在配置文件中指定。 @}q, ';H7
qArR5OJ
下面给出一个webwork调用示例: |m-N5$\IC
java代码: 5ngs1ZF@
A$wC!P|;
uj3`M9
/*Created on 2005-6-17*/ nFlN{_/
package com.adt.action.user; Qf_N,Bq{a
"bej#'M#
import java.util.List; .JKH=?~\
+'m9b7+v
import org.apache.commons.logging.Log; f6I)c$]Q
import org.apache.commons.logging.LogFactory; b]u=Iza
import org.flyware.util.page.Page; Kl. *Q
[x)T2sA
import com.adt.bo.Result; (3N/DY1/
import com.adt.service.UserService; ~m fG
Yk"
import com.opensymphony.xwork.Action; h!wq&Vi4
GSRf/::I}4
/** 3rRIrrYO
* @author Joa @]Vcl"t
*/ Py*WHHO
publicclass ListUser implementsAction{ '_?Z{|
BQfnoF
privatestaticfinal Log logger = LogFactory.getLog qq!ZYWy2
;.jj>1=Tnl
(ListUser.class); 6?,qysm06
J0Yb_(w
private UserService userService; q!W,2xqZoq
!y@\w
private Page page; jIaaNO)
46vC/
privateList users; 5"h4XINZ
EF&CV{Sw
/* Y9mhDznS
* (non-Javadoc) =RUy4+0>F
* iJOoO"Ai
* @see com.opensymphony.xwork.Action#execute() kVLZdXn,q2
*/ X#T|.mCdC
publicString execute()throwsException{ t!wbT79/
Result result = userService.listUser(page); G>pedE\
page = result.getPage(); 1o5kP,)
users = result.getContent(); [DpOI
return SUCCESS; :[l}Bb,
} #TUm&2 +V
w5q6c%VZ
/** `/1rZ#
* @return Returns the page. Jb{g{a/
*/ >c@! EPS
public Page getPage(){ H.?`90IQ
return page; hcU^!mp
} >? o5AdZ
W+u@UJi
/** yq, qS0Fo
* @return Returns the users. (M;d*gNr
*/ s
j-oaWt
publicList getUsers(){ bHq.3;
return users; no\G
>#
} Wv5=$y
-DGuaUU
/** FM3.z)>
* @param page GQ
Flt_
* The page to set. DB"z93Mr<K
*/ s4 ,`
publicvoid setPage(Page page){ DFfh!KKR$
this.page = page; QBmARQ
} |1kA6/
;U0w<>4L
/** M+-odLltw
* @param users ,X|
>d
* The users to set. Fbotn(\h@
*/ z xgDaT
publicvoid setUsers(List users){ C^JtJv
this.users = users; =sAOWI,8!
} j~rW
2(
1=_?Wg:
/** 1"A"AMZf
* @param userService sNG 7fi.|
* The userService to set. }q_Iep
*/ 4D.h~X4
publicvoid setUserService(UserService userService){ iMYJVB=
this.userService = userService; d|tNn@jN
} ZDK+>^A)
} WYvcN8F
DBfq9%J _
?S)Pv53>}
EwfL.z
ckdCd
J
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, YFcMU5_F
it j&L <e
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 )x,-O#"A
T~lHm
么只需要: F{&0(6^p!
java代码: /z1-4:^`A[
q\s>Oe6$
/GP:W6:6z6
<?xml version="1.0"?> FYaBP;@J%
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork #FGj)pu
:Mu]*N
1.0//EN" "http://www.opensymphony.com/xwork/xwork- CrGDo9JdvT
UN6nh T
1.0.dtd"> UnTvot6~
Cj)*JZVG
<xwork> r+k~%5Ff~
F{17K$y
<package name="user" extends="webwork- `g'9)Xf4KT
.P!pC
interceptors"> &K"qnng/y
Cm6%wAzC
<!-- The default interceptor stack name l\bgp3.+
$Ehe8,=fj
--> 2,6|l.WFpE
<default-interceptor-ref !y;xt?
=eeZtj.
name="myDefaultWebStack"/> |/RZGC4
K"=I,Vr:
<action name="listUser" `Yo!sgPO\
ftqeiZ
2
class="com.adt.action.user.ListUser"> /s`8=+\9
<param u85Uy
yN
"&TN}SBW
name="page.everyPage">10</param> x)2ZbIDB:"
<result WaDdZIz4
ET=-r
name="success">/user/user_list.jsp</result> \yo)oIi[p
</action> &_<!zJ;Hn
dj:6c@n
</package> idP2G|Z
8CGjI?j
</xwork> } |? W
2)R*d
/: }"Z b
l%xjCuuhU
V%'+ ob6
D"GQlR
这样就可以通过配置文件和OGNL的共同作用来对page对象设置初值 +m1y#|08
p V`)
了。并可以通过随意修改配置文件来修改每页需要显示的记录数。 `&)uuLn|
)p+6yH
注:上面的<param>的配置,还需要webwork和Spring整合的配合。 eQ eucmQd{
Hyz:i)2
8al%F_r]
lX|d:HFtP
2VA mL7)
我写的一个用于分页的类,用了泛型了,hoho m\ (crkN
.KzU7
java代码: )Vnqz
lI5
zQyt 1&!
.Fn7yTQ%
package com.intokr.util; Ld:U~M-
{Z{!tR?+
import java.util.List; -_"6jU
QwgP+ M+
/** :PF6xL&
* 用于分页的类<br> u40<>A
* 可以用于传递查询的结果也可以用于传送查询的参数<br> L<MH:
* &Uu8wFbIJ
* @version 0.01 A1V^Gi@i
* @author cheng I<^&~==
*/ 1|/]bffg!c
public class Paginator<E> { x72T5.
privateint count = 0; // 总记录数 jK9#.
0
privateint p = 1; // 页编号 uQ'Izdm
privateint num = 20; // 每页的记录数 &3%V%_
privateList<E> results = null; // 结果 t*{BN>B
N@r`+(_t
/** g6~B|?!
* 结果总数 &d/x1=
*/ nH7i)!cI~
publicint getCount(){ kKEs >a
return count; -Ay=*c.4
} N9=1<{Z
EsKOzl[c:
publicvoid setCount(int count){ j$jgEtPK9=
this.count = count; Y$&+2w,)H,
} S1D=' k]
o/5loV3h
/** /7[X_)OG
* 本结果所在的页码,从1开始 rwSmdJ~
* }6!*H!
* @return Returns the pageNo. T?Y/0znB*
*/ _@:O&G2nB
publicint getP(){ A-om?$7
return p; 0\2#(^
} Hm*?<o9mxC
D*o5fPvFO
/** L>.*^]
* if(p<=0) p=1 7t~12m8x
* 2~(\d\k
* @param p t0-)\kXcA
*/ (Y>|P
publicvoid setP(int p){ h#Q Sx@U6
if(p <= 0) y|(C L^(
p = 1; B(B77SOb
this.p = p; UK!PMkX
} |QcE5UC
y $6~&X
/** CPt62j8
* 每页记录数量 g886RhCe
*/ LL"c 9jb4z
publicint getNum(){ j'M=+
return num; R-lpsvDDL2
} *p Q'w
O/1:2G/`
/** qnCJrY6]
* if(num<1) num=1 kK&M>)&o#
*/ |';oIYs|$
publicvoid setNum(int num){ ~H1ZQ[
if(num < 1) -}$mv
num = 1; 09L"~:rg
this.num = num; S&Szc0-|k
} ngI3.v/R
!Pf6UNN'
/** o~ J~-$T{
* 获得总页数 7wB*@a-
*/ '%y5Dh
publicint getPageNum(){ nC 2e^=^
return(count - 1) / num + 1; 2?)8s"Y
} QuWWa|g^.
y 13Y,cz~B
/** f<;w1sM\
* 获得本页的开始编号,为 (p-1)*num+1 L=# nnj-
*/ rGIf/=G^r
publicint getStart(){ v{c,>]@
return(p - 1) * num + 1; K);)$8K
} /*kc|V
Y7_2pGvZ
/** lV
M)'m
* @return Returns the results. `% ulorS
*/ (T 8In
publicList<E> getResults(){ Lh;U2pA
return results; vp|'Yy(9z
} Q@0Zh,l
[
@ASAhV^+
public void setResults(List<E> results){ 7,7-E&d
this.results = results; E -+t[W
} %yPjPUHy
VqL#w<A%
public String toString(){ wT>~7$=L{
StringBuilder buff = new StringBuilder g)L<xN8
'dvi@Jx
(); wmB_)`QNP
buff.append("{"); K=N8O8R$y
buff.append("count:").append(count); KEfwsNSc%
buff.append(",p:").append(p); |A, <m#C
buff.append(",nump:").append(num); [MXyOE
buff.append(",results:").append I#UL nSJ3
1EAQ ~S!2
(results); ;q&uk-
buff.append("}"); JA2oy09G
return buff.toString(); 0`KR8# A@
} @fh:lsw
\__xTL\
} !x[].Urj
l8 H8c &
8DGPA