Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 /~i.\^HX
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 /[a|DUoHO
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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 -6rf( ER
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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 1@A7h$1P
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。 Mn]}s:v
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分页支持类: Q0V^PDF
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java代码: B/jrYT$;m
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package com.javaeye.common.util; 1^aykrnQ>
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import java.util.List; C/F@ ]_y
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publicclass PaginationSupport { c}\
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publicfinalstaticint PAGESIZE = 30; -NAmu97V}
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privateint pageSize = PAGESIZE; 5pO]vBT
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privateList items; D899gGe
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privateint totalCount; 8{oZi]ob
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privateint[] indexes = newint[0]; avlqDi1l
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privateint startIndex = 0; Q-[3j
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public PaginationSupport(List items, int d>UnJ)V}
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totalCount){ 2zhn`m
setPageSize(PAGESIZE); @9aGz6k+
setTotalCount(totalCount); 4iwf\#
setItems(items); +vf:z?I8
setStartIndex(0); )`^ /(YG
} >z QNHSi
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public PaginationSupport(List items, int 6Z Xu,ks}
" rsSW3_
totalCount, int startIndex){ >
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setPageSize(PAGESIZE); 6F(hY !}5
setTotalCount(totalCount); n,CD
setItems(items); P7Xg{L&@.
setStartIndex(startIndex); $%=G[/i'
} opXDm\
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public PaginationSupport(List items, int iA9 E^
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totalCount, int pageSize, int startIndex){ z?4=h Sy
setPageSize(pageSize); :5jexz."M
setTotalCount(totalCount); b:1 L@8s;
setItems(items); L!,d"wuD
setStartIndex(startIndex); <6/= y1QC)
} H'Nq#K
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publicList getItems(){ 4@h;5
return items; ET. dI.R8
} ya.n'X14
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publicvoid setItems(List items){ 6T_K9
this.items = items; b1xpz1
} ;}K62LSR
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publicint getPageSize(){ et` 0Je
return pageSize; {jW%P="z$"
} f}iU& 3S
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publicvoid setPageSize(int pageSize){ FqZgdmwR
this.pageSize = pageSize; LTXz$Z]
} [1SMg$@<
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publicint getTotalCount(){ 2 x32U
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return totalCount; ;|HL+je;Z
} E{%SR
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publicvoid setTotalCount(int totalCount){ Bd#
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if(totalCount > 0){ y3JMbl[S0
this.totalCount = totalCount; Da_()e[9p
int count = totalCount / C6]OAUXy:F
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pageSize; nQ-mmY>#
if(totalCount % pageSize > 0) Qnt5HSSt
count++; e <"/'Ql!k
indexes = newint[count]; cU8x Upq
for(int i = 0; i < count; i++){
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indexes = pageSize * +qy6d7^
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} y}"7e)|t%
}else{ i\Wdo/c-H
this.totalCount = 0; :FHA]oec1
} dYF=c
} 3i=Iu0
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publicint[] getIndexes(){ N'?u1P4G
return indexes; {dzoEM[
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} pj8azFZ
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publicvoid setIndexes(int[] indexes){ yWb4Ify
this.indexes = indexes; 76@qHTh}
} U(,.D}PG
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publicint getStartIndex(){ #fDs[
return startIndex; tC)6
} DNP@A4~
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publicvoid setStartIndex(int startIndex){ LW:1/w&pv
if(totalCount <= 0) H"Dn]$Q\Z
this.startIndex = 0; +B"0{>n}F
elseif(startIndex >= totalCount) xDjV`E]
this.startIndex = indexes nc?B6IV
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[indexes.length - 1]; {' 5qv@3
elseif(startIndex < 0) -d=WV:G%e
this.startIndex = 0; 5kMWW*Xtf
else{ fZ{[]dn[
this.startIndex = indexes )jDJMi_[
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[startIndex / pageSize]; vhgLcrn
} (K<9hL+X
} `u_Qa
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publicint getNextIndex(){ B\CN<<N>dD
int nextIndex = getStartIndex() + w0J|u'H
iiC!|`k"
pageSize; 'Jj=RAV`
if(nextIndex >= totalCount) X#p Wyo~
return getStartIndex(); wCKj7y[
else iK;opA"
return nextIndex; @cD uhK"U}
} v ~)LO2y
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publicint getPreviousIndex(){ `V!>J1x
int previousIndex = getStartIndex() - @N.jB#nEb
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pageSize; ccJM>9
if(previousIndex < 0) zsQoU&D 5
return0; E6MA?Ax&=
else g@ith&*=h
return previousIndex;
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} }}{Yw
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} 5Av=3[kh"%
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抽象业务类 Xrqx\X
java代码: ,<Kx{+ [h
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/** ,FSrn~-j9
* Created on 2005-7-12 WcUJhi^\C
*/ b^CNVdo'
package com.javaeye.common.business; e":G*2a
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import java.io.Serializable; Fke//- R
import java.util.List; j;~%lg=)
bn9;7`>.
import org.hibernate.Criteria; Kq6jw/T
import org.hibernate.HibernateException; M[]A2'fS
import org.hibernate.Session; Sv[ 5NZn0&
import org.hibernate.criterion.DetachedCriteria; #1nJ(-D+
import org.hibernate.criterion.Projections; I:j3sy
import X[$++p
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org.springframework.orm.hibernate3.HibernateCallback; Sus;(3EX
import QO;4}rq
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org.springframework.orm.hibernate3.support.HibernateDaoS )7c b6jCU
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upport; -7qIToO.
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import com.javaeye.common.util.PaginationSupport; Q;/a F`
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public abstract class AbstractManager extends @* ust>7
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HibernateDaoSupport { F\JUx L@8
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privateboolean cacheQueries = false; kSncZ0K{
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privateString queryCacheRegion; 6=GZLpv
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publicvoid setCacheQueries(boolean W6c]-pc
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cacheQueries){ \E1U@6a
this.cacheQueries = cacheQueries; PXKJ^fa
} +C]&2zc.
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publicvoid setQueryCacheRegion(String I3b"|%
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queryCacheRegion){ jdA
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this.queryCacheRegion = *~XA'Vw!
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queryCacheRegion; $rB3m~c|
} V<Z'(UI
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publicvoid save(finalObject entity){ n||A" @b\
getHibernateTemplate().save(entity); eU+ {*YJg
} IIFMYl gF
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publicvoid persist(finalObject entity){ 6]cryf&b
getHibernateTemplate().save(entity); /a9!Cf
} `(y(w-:W1
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publicvoid update(finalObject entity){ dIweg=x
getHibernateTemplate().update(entity); :Sg&0Wj+#j
} x+5k
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publicvoid delete(finalObject entity){ uLeRZSC
getHibernateTemplate().delete(entity); iOw3MfO
} M5L{*>4|6
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publicObject load(finalClass entity, |iYg >
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finalSerializable id){ +ZsX*/TOn
return getHibernateTemplate().load q(o/yx{bm
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(entity, id); ?WI3/>:<
} FVsj;
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publicObject get(finalClass entity, hi2sec|;<
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finalSerializable id){ kfb/n)b'
return getHibernateTemplate().get y7\"[<E`(V
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(entity, id); qNgd33u1
} ;^u*hZN[Up
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publicList findAll(finalClass entity){ bUy,5gk-
return getHibernateTemplate().find("from {QaNAR=)
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" + entity.getName()); :PYtR
} p0p4Xh1e
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publicList findByNamedQuery(finalString Yj(4&&Q
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namedQuery){ Tpp &
return getHibernateTemplate *ZSdl0e
qOV[TP,
().findByNamedQuery(namedQuery); KU9Z"9#
} 9W`Frx'h1
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publicList findByNamedQuery(finalString query, V}w;Y?]J
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finalObject parameter){ uwIc963
return getHibernateTemplate X<OSN&d
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().findByNamedQuery(query, parameter); [`=LTBt
} Fig&&b a
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publicList findByNamedQuery(finalString query, ?NNn:t iD
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finalObject[] parameters){ )QiQn=Ce
return getHibernateTemplate
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().findByNamedQuery(query, parameters); lG<hlYckv
} >XW*T5aUA
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publicList find(finalString query){ Br>Fpe$q4
return getHibernateTemplate().find !|?e7u7
SU _SU".
(query); /nx'Z0&+X
} &:*q_$]Oz
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publicList find(finalString query, finalObject [p r"ZQ]
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parameter){ %!Q`e79g8
return getHibernateTemplate().find (LAXM
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(query, parameter); ?|;yVew
} _cDF{E+;
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public PaginationSupport findPageByCriteria ^
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(final DetachedCriteria detachedCriteria){ JMBK{J K>
return findPageByCriteria mZk0@C&:6
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); )4Q?aMm
} 5__+_hO
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public PaginationSupport findPageByCriteria Fr?z"
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(final DetachedCriteria detachedCriteria, finalint 4_M>OD/"
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startIndex){ {0\,0*^p
return findPageByCriteria Z5G!ct:W
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(detachedCriteria, PaginationSupport.PAGESIZE, }$su4A@0
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startIndex); 1pp -=$k
} w&&2H8
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public PaginationSupport findPageByCriteria W\*-xf|"d
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(final DetachedCriteria detachedCriteria, finalint %6j)=IOts
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pageSize, 9e!NOl\_;.
finalint startIndex){
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return(PaginationSupport) [ANuBNF
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getHibernateTemplate().execute(new HibernateCallback(){ 7;`o(
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publicObject doInHibernate pI`?(5iK6|
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(Session session)throws HibernateException { wl=61Mb
Criteria criteria = M
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detachedCriteria.getExecutableCriteria(session); %rQuBi# 1f
int totalCount = Kz8:UG(
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((Integer) criteria.setProjection(Projections.rowCount Ths_CKwgWY
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()).uniqueResult()).intValue(); 6+rlXmd
criteria.setProjection !#ri5{od
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(null); tU wRE|_
List items = U09.Y
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criteria.setFirstResult(startIndex).setMaxResults "e3["'
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(pageSize).list(); 89}Y5#W
PaginationSupport ps = =`n]/L"Q
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new PaginationSupport(items, totalCount, pageSize, wbyE;W
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startIndex); @*N)i?>
return ps; TjK{9A
} W|k0R4K]]
}, true); o;"OSp
} Z!xVgM{
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public List findAllByCriteria(final {@}?k s5
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DetachedCriteria detachedCriteria){ UnDgu4#R`A
return(List) getHibernateTemplate 3
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().execute(new HibernateCallback(){ cR-~)UyrO
publicObject doInHibernate ulHn#)
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(Session session)throws HibernateException { ^ OJyN,A
Criteria criteria = pqM~l&
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detachedCriteria.getExecutableCriteria(session); ( fD
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return criteria.list(); R)?{]]v
} h.rD}N\L
}, true); D*5hrkV9
} PMs z`
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public int getCountByCriteria(final ){s*n=KIO
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DetachedCriteria detachedCriteria){ -
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Integer count = (Integer) ;wiao(t>4N
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getHibernateTemplate().execute(new HibernateCallback(){ b/$km?R
publicObject doInHibernate T&Xl'=/
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(Session session)throws HibernateException { ?q`0ZuAg\<
Criteria criteria = `i,_aFB|
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detachedCriteria.getExecutableCriteria(session); U8#xgz@
return A% Q!^d
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criteria.setProjection(Projections.rowCount 2 gq$C"
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()).uniqueResult(); uaw~r2
} JuRH>`
}, true); QR?yG+VU
return count.intValue(); {n3EGSP#
} <mA'X V,
} I-D^>\k+
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用户在web层构造查询条件detachedCriteria,和可选的 -Ue$T{;RoH
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 /gcEw!JS
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PaginationSupport的实例ps。 Xm2\0=v5;
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ps.getItems()得到已分页好的结果集 hD,:w%M
ps.getIndexes()得到分页索引的数组 MiT}L
ps.getTotalCount()得到总结果数 Kemw^48ts
ps.getStartIndex()当前分页索引 zIC;7 5#
ps.getNextIndex()下一页索引 zQ?!f#f
ps.getPreviousIndex()上一页索引 B0$:b!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ?SQE5Z
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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 mvW%
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一下代码重构了。 \]Kh[z0"
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我把原本我的做法也提供出来供大家讨论吧: 682Z}"I0
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首先,为了实现分页查询,我封装了一个Page类: R2etB*k6[
java代码: 0`.^MC?
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/*Created on 2005-4-14*/ .Xm(D>>k
package org.flyware.util.page; nMDxH$O
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/** o)6p A^+
* @author Joa )}Q(Tl\$
* 6-`|:[Q~
*/ V$0dtvGvH
publicclass Page { 1}hIW":3Sr
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/** imply if the page has previous page */ kdz=ltw
privateboolean hasPrePage; 9[!,c`pw
&1%q"\VI
/** imply if the page has next page */ $VAx:Y|
privateboolean hasNextPage; G;>
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/** the number of every page */ }:: S0l
privateint everyPage; umz;F
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/** the total page number */ `[o)<<}
privateint totalPage; Bwr3jV?S
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/** the number of current page */ mw_Ew]&
privateint currentPage; _%'},Xd.z
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/** the begin index of the records by the current e \O/H<
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query */ B?VhIP e
privateint beginIndex; 'B+ ' (f
rt
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/** The default constructor */ hdTzCfeZ5@
public Page(){ }68i[v9Njk
>#ZUfm{k$
} *<1r3!
lKk/p^:
/** construct the page by everyPage j*xV!DqC
* @param everyPage U%0Ty|$Y
* */ %s19KGpA
public Page(int everyPage){ w+1Gs
;
this.everyPage = everyPage; [qsEUc+Z.'
} Z{'i F
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/** The whole constructor */ bLt.O(T}
public Page(boolean hasPrePage, boolean hasNextPage, )O:0]=#))
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int everyPage, int totalPage, hy|b6wF&
int currentPage, int beginIndex){ 9@+5LZR
this.hasPrePage = hasPrePage; z3?o|A }/W
this.hasNextPage = hasNextPage; HSq}7S&U
this.everyPage = everyPage; FVhU^
this.totalPage = totalPage; YKQr,
Now
this.currentPage = currentPage; 8QMPY[{
this.beginIndex = beginIndex; Sna4wkbS
} jt+iv*2N>
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/** },|M9I0
* @return W456!OHa
* Returns the beginIndex. vm>b m
*/ J4Dry<
publicint getBeginIndex(){ [=~ pe|8:
return beginIndex; R:B^
} .bio7c6
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w&
/** 2;w*oop,O
* @param beginIndex R##~*>#
* The beginIndex to set. gCyW Vp
*/ o=`C<}
publicvoid setBeginIndex(int beginIndex){ )p*}e8L
this.beginIndex = beginIndex; .9.2Be
}
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/** Ha)ANAD
* @return @V!r"Bkg.
* Returns the currentPage. g:EVhuK
*/ 08*v~(T
publicint getCurrentPage(){ c*~]zR>s!
return currentPage; qgrg CJ
} 9?k_y ZV
f7}*X|_Y
/** [+P#tIL
* @param currentPage h yv2SxP*
* The currentPage to set. ]LM-@G+Jz
*/ A@Dw<.&_I
publicvoid setCurrentPage(int currentPage){ 7VP32Eh[
this.currentPage = currentPage; B/n[m@O
} M+x,opl
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/** H$6`{lx,
* @return `He,p -
* Returns the everyPage. aCL!]4K84$
*/ W|o'&
publicint getEveryPage(){ +$Rt+S BD
return everyPage; ."Y
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} &
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/** .rf"
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* @param everyPage 7sXxq4
* The everyPage to set. 12+>5BA
*/ {*ob_oc
publicvoid setEveryPage(int everyPage){ .(WQYOMl0
this.everyPage = everyPage; oqeSG.1
} GDuMY\1
'{B!6|"X
/** %D[0nt|X
* @return vEn4L0D
* Returns the hasNextPage. ^k\e8F/
*/ k]I0o)+O.
publicboolean getHasNextPage(){ x|5k<CiA
return hasNextPage; 9WR6!.y#f
} ~_!F01s
u#@Q:tnN_
/** yR\btx|e5~
* @param hasNextPage SZXY/~=h
* The hasNextPage to set. 2j&AiD
*/ R`~z0d.
publicvoid setHasNextPage(boolean hasNextPage){ ~JH:EB:
this.hasNextPage = hasNextPage; tq|hPd<C
} W='>:H
@n": w2^B
/** wLH] <k
* @return J:\|Nc?
* Returns the hasPrePage. A\.GV1
*/ /ID?DtJ
publicboolean getHasPrePage(){ IOV(seEY
return hasPrePage; Y"wUt &
} X'"SVO.
w/ K_B:s
/**
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* @param hasPrePage Dv/WE>?Aw
* The hasPrePage to set. 2m2;t0
*/ fP `b>]N_
publicvoid setHasPrePage(boolean hasPrePage){ s]JF0584
this.hasPrePage = hasPrePage; O7 $hYk
} |x-S&-
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/** yT,.z 0
* @return Returns the totalPage. r'*}TM'8
* |1>*;\o-
*/ [ra_ 2R
publicint getTotalPage(){ 8zR~d%pK
return totalPage; {b
} 8UVmv=T
4zo5}L`Y
/** <N9[?g)
* @param totalPage *^wm1|5
* The totalPage to set. BFOq8}fX2
*/ 9amaL~m
publicvoid setTotalPage(int totalPage){ jWE:ek*
this.totalPage = totalPage; >M/V oV
} "PpN0Rr
#: [<iSk
} <h'5cO
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 9^G/8<^^>
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个PageUtil,负责对Page对象进行构造: Y1J=3Y
java代码: ?TKRjgW`@_
l|k`YC x
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/*Created on 2005-4-14*/
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package org.flyware.util.page; ]h
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import org.apache.commons.logging.Log; n4#;k=mA
import org.apache.commons.logging.LogFactory; pv Gf\pu
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/** 65aK2MS@
* @author Joa TmV,&['mg
* L$E{ycn
*/ mh{1*T$fP
publicclass PageUtil { @dPTk"P
lUvpszH=
privatestaticfinal Log logger = LogFactory.getLog z-.+x3&o @
@8ppEFw
(PageUtil.class); +w{*Xk)4
vbC\?\_
/** ''\Ov
* Use the origin page to create a new page U_n9]Z
* @param page X6@WwM~qz
* @param totalRecords ;CPr]avY
* @return mSb#Nn6W
*/ "C{}Z
publicstatic Page createPage(Page page, int sEGO2xeI
E(8*
pI
totalRecords){ !FElW`F
return createPage(page.getEveryPage(), `</ff+Q6
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page.getCurrentPage(), totalRecords); F.=2u"[*&
} ASk|A!
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/** YW( Qmo7
* the basic page utils not including exception 4;0lvDD
@W[f1
handler b2OQtSr a
* @param everyPage KmA;HiH%J
* @param currentPage 6sx'S?Qa*
* @param totalRecords 3@M|m<_R$
* @return page <FcG
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*/ =,_ +0M9
publicstatic Page createPage(int everyPage, int OHb[qX\
z6jc8Z=O
currentPage, int totalRecords){ 1+jAz`nA:T
everyPage = getEveryPage(everyPage); pEIRh1
currentPage = getCurrentPage(currentPage); ;U.hxh;+
int beginIndex = getBeginIndex(everyPage, CsoiyY -2
I+[>I=ewa
currentPage); 1^7hf;|#g
int totalPage = getTotalPage(everyPage, ,D]QxbwZ
di6QVRj1
totalRecords); +wN^c#~7
boolean hasNextPage = hasNextPage(currentPage, OZ
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hRrn$BdLX
totalPage); iS
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boolean hasPrePage = hasPrePage(currentPage); -bT)]gA2
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returnnew Page(hasPrePage, hasNextPage, ^=RffrlZU
everyPage, totalPage, ?fUlgQ}N
currentPage, jv%kOovj
V'8s8H
beginIndex); $c:ynjL|P-
} :U3kW8;UMP
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privatestaticint getEveryPage(int everyPage){ c#Sa]n
return everyPage == 0 ? 10 : everyPage; PT=2@kH
} G~2jUyv
bF"G[pD
privatestaticint getCurrentPage(int currentPage){ =|3ek
return currentPage == 0 ? 1 : currentPage; T>x&T9
} kb{]>3Y"
9F)z4
privatestaticint getBeginIndex(int everyPage, int TMlP*d#
>VP=MbN
currentPage){ b[t> te
return(currentPage - 1) * everyPage; P@$/P99
} \?0&0;5
aqRhh=iS
privatestaticint getTotalPage(int everyPage, int zR1^I~
%
86 W9rR
totalRecords){ Z~oo;xE
int totalPage = 0; 6r"eN%m
dJ2Hr;Lc
if(totalRecords % everyPage == 0) R?~Yp?B^
totalPage = totalRecords / everyPage; }=gx#
else ryW'Z{+r'
totalPage = totalRecords / everyPage + 1 ; 8/i!' 0r\
P7nc7a
return totalPage; -8:&>~4`
} KIui(n#/
0B@SN)<kH
privatestaticboolean hasPrePage(int currentPage){ kzn5M&f>
return currentPage == 1 ? false : true; +BVym~*^
} +$C4\$t
k7?N ?7w
privatestaticboolean hasNextPage(int currentPage, [ oL.+
@ezH'y-v
int totalPage){ M m[4yP%
return currentPage == totalPage || totalPage == 4L ;% h
!c}O5TI|#
0 ? false : true; p7veQ`yNc
}
z.$4!$q
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} u
[m
6+.uU[x@
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k1X
9o;^[Ql-
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rT
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。 YP.5fq:
@hJ%@(
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 WF1px %
"^w]_^GD$d
做法如下: Gb8D[1=u=
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 l)Pu2!Ic
8TGOx%}i
的信息,和一个结果集List: QW$G
java代码: zm]aU`j
i`QKH
uJFdbBDSh
/*Created on 2005-6-13*/ 0~ZFv Wv
package com.adt.bo; v@Gl|29_
)-0kb~;|
import java.util.List; tSVc|j
p[hZ@f(z
import org.flyware.util.page.Page; @x"0_Qw
IhA5Wt0j
/** Xe<sJ.&Wf
* @author Joa o*DN4oa)
*/ iz8Bf;
publicclass Result { !G SV6
&>%T^Y|J4
private Page page; Pl=ZRKn
y.WEj?EL
private List content; V,q](bg
i\KQ!f>A
/** MYla OT
* The default constructor K[ (NTp$E
*/ J4Nln
public Result(){ RoU55mL
super(); A D1=[I3
} o
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Zb1<:[
/** BRlT7grgq
* The constructor using fields R{ a"Y$
* lTd #bN
* @param page !P)O(i=
* @param content Z?%zgqTXb
*/ A9wh(P0\
public Result(Page page, List content){ cm?\
-[cV
this.page = page; W}5xmz
this.content = content; $lLz3YS
} nq6@6GRG
R $&o*K`?
/** )xbHCoU,
* @return Returns the content. WN01h=1J_
*/ m|{3),#V
publicList getContent(){ "tB;^jhRs
return content; _>|
=L
W@7
} $4/yZaVb
Y8o)FVcyNy
/** <4P4u*/o
* @return Returns the page. Ed_N[I
*/ =>M^02"
public Page getPage(){ #wV8X`g
return page; fZ*+2T>
} O*0l+mop
<Dwar>}
/** M+w=O!dq
* @param content h&--,A >
* The content to set.
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*/ jV4\A
public void setContent(List content){ MBqt&_?K
this.content = content; ~zJ?H<>
} H[S%J3JI
b)=[1g/=L
/** 0a}u;gt,4w
* @param page ;xzUE`uUfJ
* The page to set. T[j#M+p
*/ 8C67{^`::
publicvoid setPage(Page page){ b/C`Jp
this.page = page; )?X-(4
} S/4^ d &Gr
} O"F_*
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`/EGyN6X
rEv$+pP
z@B=:tf
2. 编写业务逻辑接口,并实现它(UserManager, A29gz:F(
K95p>E`9e
UserManagerImpl) J"=vE=
java代码: =o& >fw
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*=+td)S/1
/*Created on 2005-7-15*/ w*oQ["SL
package com.adt.service; !f&Kf,#b`
Il=
W,/y
import net.sf.hibernate.HibernateException; r=X}%~_8X
%l,,_:7{
import org.flyware.util.page.Page; rdJ d#S
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import com.adt.bo.Result; kH]yl
2
iVy7elT;R
/** y5do1Z
* @author Joa ,!7 H]4Qx
*/ n#wI@W>%+
publicinterface UserManager { (UU(:/
YRh BRE
public Result listUser(Page page)throws `<\1[HJ\
+YqZ((
HibernateException; :yeq(oK,
$+>M{fg?
} 'J6
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Y0_),OaY
\ aHVs
V??dYB(
Lz:(6`S
java代码: }lfnnK#
TW[_Ko86
:j]vf8ec
/*Created on 2005-7-15*/ UmQ?rS8d
package com.adt.service.impl; |b|&XB_<]Z
7D!u1?]d{
import java.util.List; >]W)'lnO
*X,
/7C
import net.sf.hibernate.HibernateException; K00
87}H
/ew
Ukc8,
import org.flyware.util.page.Page; v7DE
import org.flyware.util.page.PageUtil; unBy&?&p
U5He?
import com.adt.bo.Result; D,g1<:<
import com.adt.dao.UserDAO; <j5NFJ9
import com.adt.exception.ObjectNotFoundException; 8'f4 Od ?
import com.adt.service.UserManager; /6h(6 *JI
w\DVzeW(
/** &9"-`-[e:
* @author Joa "Q?k'^@
*/
8`fjF/
publicclass UserManagerImpl implements UserManager { {WPobP"
Nqrmp" ]
private UserDAO userDAO; &d5ia+#
A _XhuQB;d
/** m
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* @param userDAO The userDAO to set. i}o[- S4
*/ ;\\@q"n%<
publicvoid setUserDAO(UserDAO userDAO){ H)>;/#!r-
this.userDAO = userDAO; \@1=stK:F
} >B2q+tA
[fKUyIY_
/* (non-Javadoc) TW9WMId
* @see com.adt.service.UserManager#listUser EoxQ
*/
y;AL'vm9
(org.flyware.util.page.Page) =?s3iP
*/ %B)6$!x
public Result listUser(Page page)throws zBJ7(zh!
A%{W{UP8N
HibernateException, ObjectNotFoundException { _dJ{j
int totalRecords = userDAO.getUserCount(); &g~ wS@
if(totalRecords == 0) jD`d#R
throw new ObjectNotFoundException Hw-Z
f}@jFhr'<
("userNotExist"); Q]w&N30
page = PageUtil.createPage(page, totalRecords); zKsz*xv6b
List users = userDAO.getUserByPage(page); @bnG:np
returnnew Result(page, users); 8-Hsgf.*
} acw4B5]
m~D&gGFt
} ?x0pe4^If
zBP>jM(8
V2<?ol
d'|,[p
WwUv5GZTW
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 LT,? $I
Kmdlf,[3d
询,接下来编写UserDAO的代码: 4L73]3&
3. UserDAO 和 UserDAOImpl: (
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java代码: 0^8)jpL$<9
_ %x4ty
6Vbzd0dk
/*Created on 2005-7-15*/ R3!@?mcr
package com.adt.dao; 7]%Ypv$
BkZV!Eg
import java.util.List; |P.6<
s-7RW
import org.flyware.util.page.Page; W},b{NT
;kJu$U
import net.sf.hibernate.HibernateException; R i'L
gn{=%`[
/** atW'
* @author Joa LsM7hLy
*/ //&j<vus
publicinterface UserDAO extends BaseDAO { !gmH$1w
: ~ A%#
publicList getUserByName(String name)throws 5c;h&
ZK'-U,Y.H7
HibernateException; er.CDKD%L
&
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publicint getUserCount()throws HibernateException;
4\&
/n4pXT
publicList getUserByPage(Page page)throws 4TwQO$C
1[*{(e
HibernateException; P &)1Rka
oQ7]=|
} %G@5!|J
]}UgS+g>$
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=q"eU=9
Sc]P<F7N]
java代码: oR*=|B
M-
0i7%
4{qB X?
/*Created on 2005-7-15*/ T|"7sPgGR
package com.adt.dao.impl; L}j0a> =x4
FhIqy %X
import java.util.List; SjdZyJa
X[W]=yJJ
import org.flyware.util.page.Page; K"2|[ 5
!?[oIQ)h
import net.sf.hibernate.HibernateException; fB+b}aoV
import net.sf.hibernate.Query; 7);:ZpDv%L
lr2rQo>
import com.adt.dao.UserDAO; LihjGkj\g
#~Q8M*~@
/** ;:mY JV
* @author Joa -n*;W9
*/ oY`qI nM_
public class UserDAOImpl extends BaseDAOHibernateImpl }xlKonk
+[m8c){
implements UserDAO { ZB5?!.ND
!~lW3
/* (non-Javadoc) +dkS/b
* @see com.adt.dao.UserDAO#getUserByName 3hq1yyec
0W>9'Rw
(java.lang.String) dZ:r&Qa
*/ ^^(<c,NX#M
publicList getUserByName(String name)throws W>spz~w%j
!5x
Ly6=}
HibernateException { 83.E0@$
String querySentence = "FROM user in class #X.+
' eO/PnYW
com.adt.po.User WHERE user.name=:name"; !k~z5z'=py
Query query = getSession().createQuery nj\_lL+
G5Q!L;3HZ
(querySentence); {aN(d3c
query.setParameter("name", name); ^ua12f
return query.list(); ykq'g|
} G+)?^QTn
OR+A_:c.D
/* (non-Javadoc) FQf#*
* @see com.adt.dao.UserDAO#getUserCount() 4FA|[An
*/ u9![6$R
publicint getUserCount()throws HibernateException { }sMW3'V
int count = 0; W81o"TR|pt
String querySentence = "SELECT count(*) FROM /BH.>R4`A
ZHy><=2
user in class com.adt.po.User"; 'o\;x"YJ
Query query = getSession().createQuery 7tH]*T9e>
I{dl% z73
(querySentence); 2
X<nn
count = ((Integer)query.iterate().next q|q::q*
v`)m">e*w
()).intValue(); L? ;/cO^
return count; bNvAyKc-
} B5Va%?Wg?H
#t5juX9Ho9
/* (non-Javadoc) @
t@|q
* @see com.adt.dao.UserDAO#getUserByPage *1;23BiH-
/!bx`cKG
(org.flyware.util.page.Page) Qp&?L"U)2
*/ 11*"d#
publicList getUserByPage(Page page)throws -Uf4v6A
vug-n 8
HibernateException { ?1m ,SK
String querySentence = "FROM user in class e<'U8|}hc{
i$#,XFFp~
com.adt.po.User"; 7l}~4dm2J
Query query = getSession().createQuery p#b{xK
szn%wZW
(querySentence); (^S5Sc=
query.setFirstResult(page.getBeginIndex()) 4? {*(
.setMaxResults(page.getEveryPage()); $f(agG]
return query.list(); &^ceOV0+
} >H?uuzi
Bi_J5 If
} )tPl<lb
pU[K%@sC
%EB;1
S%V%!803!
~D!ESe*=
至此,一个完整的分页程序完成。前台的只需要调用 )GCLK<,swu
2^bgC~2C1
userManager.listUser(page)即可得到一个Page对象和结果集对象 9R:(^8P8
'X ~Ab
的综合体,而传入的参数page对象则可以由前台传入,如果用 /T#o<D
7X:hIl
webwork,甚至可以直接在配置文件中指定。 (lWKy9eTy`
MZiF];OY
下面给出一个webwork调用示例: GsRt5?X/*
java代码:
jrdtd6b}
0&o
WfTg
'7=<#Blc
/*Created on 2005-6-17*/ /]l f>\x1
package com.adt.action.user; p(7c33SyF
kpY%&
import java.util.List; :9O|l)N)W=
wJr/FE7c
import org.apache.commons.logging.Log; ~:s!].H
import org.apache.commons.logging.LogFactory; bF7`] 83
import org.flyware.util.page.Page; *U2Ck<"]
0Sz/c+ 6
import com.adt.bo.Result; zlN+edgY#,
import com.adt.service.UserService; uyvs kz\
import com.opensymphony.xwork.Action; ;q^,[(8
{8W |W2o$!
/** ]:Wb1
* @author Joa o+R. u}|
*/ s~#?9vW
publicclass ListUser implementsAction{ IBF.&[[S
;?#i]Bh>S
privatestaticfinal Log logger = LogFactory.getLog r}Q@VS%%
8*"rZh}'
(ListUser.class); q
w"e0q% )
mURX I'JkX
private UserService userService; u'{sB5_H
C=M?
private Page page; $t%" Tr
xDNw/'
privateList users; Y~<rQ
%9cqJ]S
/* '$lw[1
* (non-Javadoc) "F04c|oR<X
* xU:PhhS
* @see com.opensymphony.xwork.Action#execute() 5,g$|,Shv
*/ o(vZ*^\
publicString execute()throwsException{ '[0
3L9
Result result = userService.listUser(page); zX006{vig
page = result.getPage(); %pQdq[J={
users = result.getContent(); O7E;W| ]
return SUCCESS; h%4~0
} ntd
":BKi
)yfOrsM
/** 'Sm/t/g"|
* @return Returns the page. Yf%[6Y{
*/ c'>8pd
public Page getPage(){ Y>c5:F;
return page; N$L&|4r
} 6oe$)iV
mk$Yoz
/** zcbA)
* @return Returns the users. D<$j`r
*/ .oB'ttF1
publicList getUsers(){ b3jU~L$
return users; !^Qb[ev
} R;N>#_9HU
y^vfgP<@
/** K[Ws/yc^a
* @param page k
N
uN4/
* The page to set. rYP8V
>
*/ GNj/jU<o!
publicvoid setPage(Page page){ w2RESpi
this.page = page; A@lhm`Aa
} GHJQ d&G8G
Yn?2,^?N
/** fM
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* @param users _dB0rsCnU%
* The users to set. UeC%Wa<[
*/ rA>R`
publicvoid setUsers(List users){ *U5>j#,
this.users = users; (h8hg+l
o
} ~P_d0A~T
*=KexOa9
/** "m\UqQGX
* @param userService 5O4&BxQ~}
* The userService to set. Q?I"J$]&L
*/ 1Tts3O.
publicvoid setUserService(UserService userService){ %`<`z yf
this.userService = userService; S]e~)IgO
} -qnXa
} (J?}eb;>n
4jZi62
T(fR/~:z?
D aqy+:
bC,M&<N
上面的代码似乎看不出什么地方设置了page的相关初值,事实上, eG2qOq$[
SS<+fWXE
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 C.TCDl
c`N`xU+z
么只需要: -EX3'
[*'
java代码: ezNE9g
t&?v9n"X
."#jN><t
<?xml version="1.0"?> \gk3w,B?E
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork y^+[eT&