Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ]gj@r[
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 &9g#Vq%
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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 |y=D^NTG
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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 cKy%0oTla
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分页支持类: kp;MNRc
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java代码: Bp6Evi
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package com.javaeye.common.util; anV)$PT=
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import java.util.List; g-(xuR^*
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publicclass PaginationSupport { )5V1HWjU
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publicfinalstaticint PAGESIZE = 30; Wj*6}N/
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privateint pageSize = PAGESIZE; n:!J3pR
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privateList items; a+BA~|u^
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privateint totalCount; ,!py
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privateint[] indexes = newint[0]; 6ensNr~ea
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privateint startIndex = 0; 6<~y!\4;F
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public PaginationSupport(List items, int _bz,G"w+:
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totalCount){ n<$I, IRE
setPageSize(PAGESIZE); nMbV{h ,
setTotalCount(totalCount); #5I "M WA
setItems(items); p]g/iLDZ
setStartIndex(0); 2I4P":q
} 1-[{4{R
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public PaginationSupport(List items, int MR6vr.~
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totalCount, int startIndex){ ?8nG F%p
setPageSize(PAGESIZE); Zj^H3h
setTotalCount(totalCount); Ek.j@79
setItems(items); RGKJO_*J2
setStartIndex(startIndex); +[7u>RJ
} K^vMIo h
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public PaginationSupport(List items, int tw')2UGg
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totalCount, int pageSize, int startIndex){ 6a!X`%N=
setPageSize(pageSize);
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setTotalCount(totalCount); 0\o'd\
setItems(items); ?k?Hp:8?=
setStartIndex(startIndex); s`2o\]
} 87/{\h
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publicList getItems(){ S9BJjo
return items; n(+:l'#HJ
} pVY.&XBZ$
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publicvoid setItems(List items){ #,;k>2j0
this.items = items; ouI0"R&@
} M;bQid@BG
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publicint getPageSize(){ w{qYP
return pageSize; Vqr&)i"b$
} eyWwE%
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publicvoid setPageSize(int pageSize){ ]7O?c=
this.pageSize = pageSize; -|kDa1knA
} YD%Kd&es
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publicint getTotalCount(){ N!3f1d7RQ
return totalCount; \3/9lE|gh
} Pg36'aTe%j
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publicvoid setTotalCount(int totalCount){ IR&u55#I6
if(totalCount > 0){ PTh
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this.totalCount = totalCount; Ui.F<,E
int count = totalCount / Lsz`nD5
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pageSize; 1,J.
if(totalCount % pageSize > 0) x@ O:
count++; $b$D[4
indexes = newint[count]; }R x%&29&
for(int i = 0; i < count; i++){ {%Y7]*D
indexes = pageSize * ;sf/tX
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} HKwGaCj`
}else{ |"<
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this.totalCount = 0; !|/fVWH
} N@$%0!
} qG qu/$bh
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publicint[] getIndexes(){ 9lxT5Wg
return indexes; .%A2
} \v_C7R;&
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publicvoid setIndexes(int[] indexes){ 2vC=.1k
this.indexes = indexes; 2 *$n?
} K&h6#[^\d
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publicint getStartIndex(){ Ah`dt8t
return startIndex; 4@I]PG
} EUkNh>U?
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publicvoid setStartIndex(int startIndex){ 68*{Lo?U
if(totalCount <= 0) _;{-w%Vf
this.startIndex = 0; i]z
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elseif(startIndex >= totalCount) h(-&.Sm")H
this.startIndex = indexes Q/9b'^UJ
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[indexes.length - 1]; V]}b3Y!(
elseif(startIndex < 0) Vvj]2V3
this.startIndex = 0; 8rYK~Sz
else{ %-Z~f~<?
this.startIndex = indexes w$4Lu"N:
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[startIndex / pageSize]; xJhbGK
} `,Gk1~Wv
} ]N_^{k,
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publicint getNextIndex(){ C.-a:oQ[
int nextIndex = getStartIndex() + o{p_s0IX;S
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pageSize; @UJmbD{
if(nextIndex >= totalCount) z
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return getStartIndex(); )|x5#b-lz
else
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return nextIndex; cG:`Zj~4
} d
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publicint getPreviousIndex(){ pt#[.n#f
int previousIndex = getStartIndex() - |5Pbc&mH8A
kVv
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pageSize; xF;v 6d
if(previousIndex < 0) 1\0@?6`^
return0; K~-XDLh5Nu
else df& |Lc1J
return previousIndex; W)cLMGet
} }HorR2(`N
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} >ULp!
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抽象业务类 bf/loMtD
java代码: ?y)X $D^
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/** ~*[4DQ[\
* Created on 2005-7-12 5FI>T=QF
*/ iGLYM-
package com.javaeye.common.business; c&-$?f
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import java.io.Serializable; P*Sip?tdE
import java.util.List; z_@zMLs
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import org.hibernate.Criteria; o q)"1
import org.hibernate.HibernateException; V&v~kzLr+
import org.hibernate.Session; T(^8ki
import org.hibernate.criterion.DetachedCriteria; gq3OCA!cX
import org.hibernate.criterion.Projections; GuvF
import |LE++t*X~
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org.springframework.orm.hibernate3.HibernateCallback; e622{dfVS
import v^fOT5\
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org.springframework.orm.hibernate3.support.HibernateDaoS ^\jX5)2{
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upport; `|Z@UPHzG
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import com.javaeye.common.util.PaginationSupport; zqr%7U
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public abstract class AbstractManager extends bGc|SF<V
3>)BI(Wl
HibernateDaoSupport { Lu.tRZ`$38
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privateboolean cacheQueries = false; >[4|6k|\x
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privateString queryCacheRegion; =[os<+
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publicvoid setCacheQueries(boolean Q$/F gS
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cacheQueries){ M|e
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this.cacheQueries = cacheQueries; (Gc`3jJ
} l zPS
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publicvoid setQueryCacheRegion(String [Vp2!"
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queryCacheRegion){ 14!a)Ijl
this.queryCacheRegion = 9k[},MM
@i-@mxk6<
queryCacheRegion; DeQ'U!?+N
} %&+R":Bw
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publicvoid save(finalObject entity){ KVpAV$|e
getHibernateTemplate().save(entity); SLOYlRGCi
} B\>}X_\4
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publicvoid persist(finalObject entity){ wf<`J/7u
getHibernateTemplate().save(entity); Tc5OI' -V
} )60f
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publicvoid update(finalObject entity){ hs_|nr0;[
getHibernateTemplate().update(entity); 5>[sCl-
} @^6OV)
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publicvoid delete(finalObject entity){ Qwo9>ClC
getHibernateTemplate().delete(entity); wDMB
} 4m[C-NB!g
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publicObject load(finalClass entity, Yk@s"qm3
::Q);
finalSerializable id){ G|oB'~{&
return getHibernateTemplate().load &\lS
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(entity, id); hIo S#]
} ^npS==Y]!.
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publicObject get(finalClass entity, 7a]Zws
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finalSerializable id){ EJ;0ypbG
return getHibernateTemplate().get n.6
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(entity, id); Fif^V
}
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publicList findAll(finalClass entity){ 1L=Qg4 H
return getHibernateTemplate().find("from s]<r
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" + entity.getName()); cU5"c)$'
} 2T(,H.O
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publicList findByNamedQuery(finalString m/c&/6nk
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namedQuery){ /xm#:+Sc
return getHibernateTemplate :;*#Qh3"
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().findByNamedQuery(namedQuery); .6 ?>t!&W
} } .H Fm'p
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publicList findByNamedQuery(finalString query, 3auJ^B}
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finalObject parameter){ {}J@+Zsi
return getHibernateTemplate (06Vcqg
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().findByNamedQuery(query, parameter); )\D40,p
} e]*=sp!T
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publicList findByNamedQuery(finalString query, _?]BVw
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finalObject[] parameters){ l88a#zUQDN
return getHibernateTemplate +x9"#0|k;
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().findByNamedQuery(query, parameters); yK%GsCJd:
} <X I35\^
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publicList find(finalString query){ q'Pz3/mk
return getHibernateTemplate().find Ux)p%-
q4.dLU,1
(query); 'f?&EsIV?
} 7=p-A_X
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publicList find(finalString query, finalObject ?y*+^E0
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parameter){ Y zBA{FE
return getHibernateTemplate().find /@:up+$
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(query, parameter); q~Q)'*m
} ,JQxs7@2k
@X|i@{<';
public PaginationSupport findPageByCriteria igj={==m
@
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(final DetachedCriteria detachedCriteria){ DNW2;i<hsz
return findPageByCriteria 9"HmHy&:E
mj(&`HRs4
(detachedCriteria, PaginationSupport.PAGESIZE, 0); Mi/ &$"=
} ]Ic?:lKN
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public PaginationSupport findPageByCriteria (+gL#/u
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(final DetachedCriteria detachedCriteria, finalint :B*vkwT
=(|xU?OL
startIndex){ C7jc 6(>m
return findPageByCriteria JwI`"$>w
te\h?H
(detachedCriteria, PaginationSupport.PAGESIZE, 7dlKdKH
N7~)qqb
startIndex); rZ!Yi*? f
} :<N6i/
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public PaginationSupport findPageByCriteria &weY8\HD
(
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(final DetachedCriteria detachedCriteria, finalint M)`HK
.
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pageSize, }dd k}wga
finalint startIndex){ sk7rU+<
return(PaginationSupport) uK;K{
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getHibernateTemplate().execute(new HibernateCallback(){ ,XeyE;||
publicObject doInHibernate U50s!Zt45
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(Session session)throws HibernateException { 0E?s>-b
Criteria criteria = 62MRI
@QVqpE<|
detachedCriteria.getExecutableCriteria(session); oTF^<I-C
int totalCount = _^6|^PT.
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((Integer) criteria.setProjection(Projections.rowCount %R.xS}
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@ kJ0K
()).uniqueResult()).intValue(); w*<Y$hnBzF
criteria.setProjection [:nx);\
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(null); ^zaKO'KcV
List items = |-(IJG#)
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criteria.setFirstResult(startIndex).setMaxResults XdGpW
J7'f@X~nM
(pageSize).list(); X!7VyE+n
PaginationSupport ps = m feMmKFu\
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new PaginationSupport(items, totalCount, pageSize, mFqSD
" K 8&{=
startIndex); ySwYV
return ps; Cdp]Nv6
} 4?>18%7&
}, true); I!$jYY2
} Ic[}V0dk
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public List findAllByCriteria(final p{ @CoOn
)YzH k ;(
DetachedCriteria detachedCriteria){ XMN?;Hj>
return(List) getHibernateTemplate 6o=qJ`m[?
xH_A@hf;
().execute(new HibernateCallback(){ Lh8bQH
publicObject doInHibernate =zeFK_S!
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(Session session)throws HibernateException { .
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Criteria criteria = 2E`~ qn
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detachedCriteria.getExecutableCriteria(session); [ME}Cv`?<E
return criteria.list(); u\{qH!?t
} ]Q6+e(:~ZH
}, true); .e`,{G(5q7
} ?Yq J.F;
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public int getCountByCriteria(final \4h>2y
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DetachedCriteria detachedCriteria){ |Z`M*.d+
Integer count = (Integer) @gt)P4yE
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getHibernateTemplate().execute(new HibernateCallback(){ V19e>
publicObject doInHibernate [_y9"MMwn
}Vvsh3
(Session session)throws HibernateException { "s F Xl
Criteria criteria = LXHwX*`Y
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detachedCriteria.getExecutableCriteria(session); ,M\j%3
return J0^{,eY<
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criteria.setProjection(Projections.rowCount 5cD
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()).uniqueResult(); n?'d|h
} &EAk
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}, true); [096CK
return count.intValue(); ]>tq|R78
} ;yF[2P ;
} 0o=!j3RjH
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# v.L$7O
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用户在web层构造查询条件detachedCriteria,和可选的 r%0pQEl
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 IE&_!ce
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PaginationSupport的实例ps。 hVMYB_<~
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ps.getItems()得到已分页好的结果集 o_iEkn
ps.getIndexes()得到分页索引的数组 pG/
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ps.getTotalCount()得到总结果数 yh S#&)O
ps.getStartIndex()当前分页索引 WK
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ps.getNextIndex()下一页索引 g[/^cJHQ
ps.getPreviousIndex()上一页索引 O$a#2p&
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Z[Wlyb0
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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 ,{?wKXJ}L!
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一下代码重构了。 L>SZgmV+
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我把原本我的做法也提供出来供大家讨论吧: _-n Y2)
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首先,为了实现分页查询,我封装了一个Page类: Ba<ngG
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java代码: SU/G)&Mi
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/*Created on 2005-4-14*/ brntE:
package org.flyware.util.page; ~%`EeJwT
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/** .N5'.3
* @author Joa S#k{e72 *
* .>P~uZiX!
*/ !~WZ_z
publicclass Page { *2`:VFEV
^%;" [r
/** imply if the page has previous page */ u=%y
privateboolean hasPrePage; o~= iy
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/** imply if the page has next page */ ! Q!&CG5l
privateboolean hasNextPage; i<mevL
Rfht\{N 7
/** the number of every page */ <KtBv Ip]
privateint everyPage; 5:c;RRn
+kM\
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/** the total page number */ {ih:FcI
privateint totalPage; L_^`k4ct
cv= \g Z
/** the number of current page */ EJ G2^DSS
privateint currentPage; /9 pbnzn
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/** the begin index of the records by the current 3Y`>6A=
zO%w_7w
query */ :<|Z.4}kJb
privateint beginIndex; [UoqIU
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/** The default constructor */ wazP,9W?
public Page(){ WHP;Neb6
RK-x?ZYH'
} p'}lN|"{O
u#FXW_-TK
/** construct the page by everyPage VgA48qZ
* @param everyPage 0(8gQ
2n
* */ DcN"=Y
public Page(int everyPage){ 'j }g
this.everyPage = everyPage; ehE-SrkU'
} -,^WaB7u\
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/** The whole constructor */ .U 39nd
public Page(boolean hasPrePage, boolean hasNextPage, U+} y
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;|!MI'Af
ugI#ZFjJWE
int everyPage, int totalPage, x9%-plP
int currentPage, int beginIndex){ \n_3Bwd~
this.hasPrePage = hasPrePage; #&V5H{
this.hasNextPage = hasNextPage; [t{](-
this.everyPage = everyPage; )!eEO [\d
this.totalPage = totalPage; &Pq\cNYzW
this.currentPage = currentPage; HyEa_9
this.beginIndex = beginIndex; "R23Pi
} i
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/** yX'IZk#_L
* @return KaW~ERx5
* Returns the beginIndex. Z(HZB
*/ D-pX<0-y
publicint getBeginIndex(){ >!
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return beginIndex; :G}DAUFN
} $@2"{9Z
WNa3^K/W{
/** yp p 4L|R
* @param beginIndex
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* The beginIndex to set. 9 #Y2`pT
*/ zmb@*/fK
publicvoid setBeginIndex(int beginIndex){ p![&8i@ym
this.beginIndex = beginIndex; vU}: U)S
} $ 6!iBX@
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/** C`0%C7
* @return = /Wu'gG)
* Returns the currentPage. @+&'%1
*/ 4gOgWBv
publicint getCurrentPage(){ | 3giZ{
return currentPage; C2G |?=
} >S'>!w
zh%qS~8Yv
/** 2ce'fMV
* @param currentPage O&V[g>x"U
* The currentPage to set. &Mj1CvCv
*/ eu9w|g
publicvoid setCurrentPage(int currentPage){ X`1p'JD
this.currentPage = currentPage; $)*xC!@6X
} '#H")i
\XS]N_}8>
/** RdI};K
* @return _CE9B e\
* Returns the everyPage. B\[-fq
*/ 3gc"_C\$
publicint getEveryPage(){ %ek"!A
return everyPage; h<Wg 3o
} ,QvYTJ{
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/** <KLg0L<W
* @param everyPage .S_QQM}Q
* The everyPage to set. -~O/NX
*/ V#J"c8n
publicvoid setEveryPage(int everyPage){ J`<f
this.everyPage = everyPage; +"uwV1)b"
} <d"Gg/@a
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/** fY_%33_I$
* @return TwFb%YM
* Returns the hasNextPage. Z`s!dV]e9
*/ )6{P8k4Zr
publicboolean getHasNextPage(){ 1lcnRHO
return hasNextPage; lKWr=k~
} <*Ub2B[m
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/** s.:r;%a
* @param hasNextPage aZKXD! 4
* The hasNextPage to set. c'05{C
*/ 2~FPw{]j
publicvoid setHasNextPage(boolean hasNextPage){ )gXTRkmw
this.hasNextPage = hasNextPage; _~A~+S}
} DYRE1!
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/** ZEGd4_ux
* @return /{X_
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* Returns the hasPrePage. ]:et~pfW
*/ k1fRj_@WPT
publicboolean getHasPrePage(){ !ZrB^?sO
return hasPrePage; (Es{l a G
} Rla4L`X;
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/** 3LW[H+k
* @param hasPrePage >a=d;
* The hasPrePage to set. >^3zU
*/ >nry0 ;z0,
publicvoid setHasPrePage(boolean hasPrePage){ "EH,J
this.hasPrePage = hasPrePage; FkB{ SCJ
} LgHJo-+>
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/** 10MU-h.)
* @return Returns the totalPage. \hbiU]
* |ym%|
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*/ [5Y<7DS
publicint getTotalPage(){ <&U!N'CE
return totalPage; (WE,dY+.
} }-p,iTm
zu<3^=3
/** RH1uVdJ1
* @param totalPage 7Fl-(Nv`
* The totalPage to set. "H1:0p
*/ W-D[z#)/Y
publicvoid setTotalPage(int totalPage){ kG^dqqn6
this.totalPage = totalPage; l~1AT%
} KzVTkDn,
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} HmV />9
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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 A*'V+(
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个PageUtil,负责对Page对象进行构造: B*,?C]0{
java代码: c3k|G<C2
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T~s}N x#
/*Created on 2005-4-14*/ yVS\Q,:J9
package org.flyware.util.page; sKfXg`0
wFL3&*
import org.apache.commons.logging.Log; 84M3c
import org.apache.commons.logging.LogFactory; CLN+I'uX0
%S#WPD'Y
/** Q)^g3J
* @author Joa .mPg0
* rkYjq4Z@
*/ =Od>;|]m
publicclass PageUtil { tt4+ m>/T
#D)x}#V\
privatestaticfinal Log logger = LogFactory.getLog }.{}A(^YR
9;KJr[FQV
(PageUtil.class); j|K.i/
&U&%ka<*
/** I]uhi{\C
* Use the origin page to create a new page @2e2^8X7f
* @param page Pp_V5,i\
* @param totalRecords 9Nt3Z>d
* @return \9/1L?@
*/ /cY^]VLe
publicstatic Page createPage(Page page, int ($WE=biZ&
qY# d+F,t
totalRecords){ nb+m.X
return createPage(page.getEveryPage(), OD+5q(!"a
P(h5=0`*PR
page.getCurrentPage(), totalRecords); 2p:r`THvS5
} ;V.vfar
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/** -7`-wu
* the basic page utils not including exception ]d'^Xs
rt b* n~
handler b3U6;]|x
* @param everyPage X\sm[_I
* @param currentPage V(mnyI
* @param totalRecords +Me2U9
* @return page (@&I_>2Q
*/ o&-L0]i|
publicstatic Page createPage(int everyPage, int T-8J
77Q}=80GU;
currentPage, int totalRecords){ (0jr;jv
everyPage = getEveryPage(everyPage); #":a6%0Q
currentPage = getCurrentPage(currentPage); JJf<*j^G
int beginIndex = getBeginIndex(everyPage, (5`T+pAsV
N z~"vi(t
currentPage); AcC8)xRpk4
int totalPage = getTotalPage(everyPage, O&$0&dhc
Iql5T#K+
totalRecords); 0kLEBoOh
boolean hasNextPage = hasNextPage(currentPage, vA-PR&
3] 76fF\^[
totalPage); OE"<!oIs
boolean hasPrePage = hasPrePage(currentPage); ((MLM3zJ
PXEKV0y
returnnew Page(hasPrePage, hasNextPage, V5MO}
everyPage, totalPage, 6Rz[?-mkLO
currentPage, GGE[{Gb9
_ #'9kx|)
beginIndex); oR %agvc^^
} i\p:#'zk5
Q4K+*Fi}
privatestaticint getEveryPage(int everyPage){ {Y_Nj`#BT
return everyPage == 0 ? 10 : everyPage; r!K|E95oj9
} &!1}`4$[T
;KcFy@ 6q5
privatestaticint getCurrentPage(int currentPage){ ?`P2'i<b
return currentPage == 0 ? 1 : currentPage; F6dr
} gdi`x|0
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privatestaticint getBeginIndex(int everyPage, int w0Ij'=:
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currentPage){ D4Sh9:\
return(currentPage - 1) * everyPage; H/jm
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} l{%a&/
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privatestaticint getTotalPage(int everyPage, int - ]Y wl
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totalRecords){ <lo`q<q
int totalPage = 0; GqUSVQ
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if(totalRecords % everyPage == 0) 3{3/: 7
totalPage = totalRecords / everyPage; `clB43i
else gX*K&*q
totalPage = totalRecords / everyPage + 1 ; gaeOgP.0
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return totalPage; %h+uD^^$
} +X^4;
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privatestaticboolean hasPrePage(int currentPage){ LK+felL
return currentPage == 1 ? false : true; _A-V@%3
} ZvH{wt
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privatestaticboolean hasNextPage(int currentPage, v~5<:0dL
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int totalPage){ K^H>~`C=
return currentPage == totalPage || totalPage == grbTcLSF
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0 ? false : true; <]Y[XI(kr
} z5EVG
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} A,c'g}:
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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。 q^Inb)FeN
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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 xIgql}.
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做法如下: l0`'5>
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 dS$ji#+d$
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的信息,和一个结果集List: G(\Ckf:
java代码: RgGA$HN/
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/*Created on 2005-6-13*/ 3!Bj{;A
package com.adt.bo; xOIg|2^8
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import java.util.List; XGIpUz
wLMvC{5
import org.flyware.util.page.Page; bi,mM,N/
l* Y[^'
/** k4R4YI"jV
* @author Joa 1Z:R,\+L
*/ +/q0Y`v
publicclass Result { yW>R RE;
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private Page page; JS7dsO0;
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