Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 }a/x._[s
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 A
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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 _j< K=){
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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 @ycDCB(D}
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分页支持类: j g8fU
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java代码: jRJn+
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package com.javaeye.common.util; ]G5w6&d
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import java.util.List; !4XOy B
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publicclass PaginationSupport { }BZ"S-hZ
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publicfinalstaticint PAGESIZE = 30; 18+)`M-5o
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privateint pageSize = PAGESIZE; KH(%?
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privateList items; <}<zgOT[1!
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privateint totalCount; lku[dQdk
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privateint[] indexes = newint[0]; _AAaC_q
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privateint startIndex = 0; bpH^:fyLU`
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public PaginationSupport(List items, int '98VYCL
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totalCount){ "B3N*R(["
setPageSize(PAGESIZE); JBE!j-F
setTotalCount(totalCount); mS(fgq6
setItems(items); UNom-
setStartIndex(0); Ta(Y:*Ri
} [d(U38BI
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public PaginationSupport(List items, int 1FlX'[vh
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totalCount, int startIndex){ ]xRM&=)<
setPageSize(PAGESIZE); \m(VdE
setTotalCount(totalCount); K{|p~B
setItems(items); 2R;}y7{
setStartIndex(startIndex); @D{KdyW
} PsnWWj?c
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public PaginationSupport(List items, int $8UUzk
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totalCount, int pageSize, int startIndex){ j27?w<
setPageSize(pageSize); /?@3.3sl_
setTotalCount(totalCount); pGJ>O/%
setItems(items); uE%r/:!k4$
setStartIndex(startIndex); ([SU:F!uW(
} }001K
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publicList getItems(){ L ^q""[
return items; NdMb)l)m
} nuk*.Su
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publicvoid setItems(List items){ v|uAzM{73
this.items = items; ABQ('#78
} ';3{T:I
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publicint getPageSize(){ C-Q28lD}f
return pageSize; sH{4Y-J
} 1_9<3,7
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publicvoid setPageSize(int pageSize){ 9^oKtkoDZ
this.pageSize = pageSize; yXSFjcoB
} c~z82iXNO
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publicint getTotalCount(){ )bS yB29S
return totalCount; ~Sj9GxTe
} ?[@J8
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publicvoid setTotalCount(int totalCount){ AL9chYP}/
if(totalCount > 0){ ~;l@|7wGz
this.totalCount = totalCount; hQYL`Dni
int count = totalCount / D{GfLib"U
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pageSize; >AVVEv18
if(totalCount % pageSize > 0) t;W0"ci9
count++; \.MR""@y`{
indexes = newint[count]; `[f*Zv w
for(int i = 0; i < count; i++){ U{2BVqM
indexes = pageSize * J!c)s!`w
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} Zq+v6fk_Mn
}else{ Q6PHpaj
this.totalCount = 0; 4!Fo$9
} NjVYLn<.r
} FHj"
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publicint[] getIndexes(){ }AB,8n`
return indexes; 4 ezEW|S
} _
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publicvoid setIndexes(int[] indexes){ VCV"S>aVf
this.indexes = indexes; Q-_N2W?
} CAfGH!l!
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publicint getStartIndex(){ u(@$a4z
return startIndex; '))0Lh
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} L-ET<'u
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publicvoid setStartIndex(int startIndex){ xN5)
if(totalCount <= 0) `, OG7hg
this.startIndex = 0; @5N]ZQ9
elseif(startIndex >= totalCount) smlpD3?va
this.startIndex = indexes ;rF\kX&Jh
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[indexes.length - 1]; Sdp&jZY
elseif(startIndex < 0) x-$&g*<
this.startIndex = 0; VJeu8ZJ.
else{ VEWi_;=J1
this.startIndex = indexes \:b3~%Fz
>" )Tf6zw&
[startIndex / pageSize]; z>LUH
} /Lfm&;
} kjIAep0rT
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publicint getNextIndex(){ r(:5kC8K
int nextIndex = getStartIndex() + wo4;n9@I
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pageSize; e^8 O_VB
if(nextIndex >= totalCount) c23oCfB>
return getStartIndex(); VLOO8N[o
else zwhe
return nextIndex; Luq#9(P
} Ur9?Td'*>
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publicint getPreviousIndex(){ :*I#n
int previousIndex = getStartIndex() - Y\D!/T
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pageSize; H=<S 9M
if(previousIndex < 0) ND'E8Ke pq
return0; BL0 {HV!
else caIL&G,
return previousIndex; Z-^LKe
} Y1OCLnK~
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} = I:.X ;
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抽象业务类 '.on)Zd.
java代码: Dt}JG6 S
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/** E%yNa]\P
* Created on 2005-7-12 %aHB"vi6
*/ 2y//'3[
package com.javaeye.common.business; SON-Z"v
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import java.io.Serializable; (uXL^oja
import java.util.List; vq0Vq(V=
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import org.hibernate.Criteria; lNz7u:U3
import org.hibernate.HibernateException; 'H3^e}
import org.hibernate.Session; @ju@WY45$^
import org.hibernate.criterion.DetachedCriteria; rNrxaRQ
import org.hibernate.criterion.Projections; RmI]1S_=
import <lgYcdJ
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org.springframework.orm.hibernate3.HibernateCallback; xqeyD* s
import 02f~En}>6
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org.springframework.orm.hibernate3.support.HibernateDaoS !02`t4Zc-
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upport; .7Dtm<K#
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import com.javaeye.common.util.PaginationSupport; LzG%Z1`
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public abstract class AbstractManager extends AS!?q
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HibernateDaoSupport { ]GMe\n
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privateboolean cacheQueries = false; rxe>}ZO
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privateString queryCacheRegion; 9eGyyZg
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publicvoid setCacheQueries(boolean 6w*dKInG[-
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cacheQueries){ O(#)m>A
this.cacheQueries = cacheQueries; EOIN^4V"
} cbNTj$'b2u
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publicvoid setQueryCacheRegion(String l>2E (Y|
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queryCacheRegion){ ls_'')yp
this.queryCacheRegion = cL-[ZvyVX
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queryCacheRegion; JUsQ,ETn
} ~d
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publicvoid save(finalObject entity){ spGb!Y`mR
getHibernateTemplate().save(entity); 5 f@)z"j
} ?L5zC+c!
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publicvoid persist(finalObject entity){ ]jtK I4
getHibernateTemplate().save(entity); J}*,HT *
} qaqBOHI6G
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publicvoid update(finalObject entity){ 'OE&/
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getHibernateTemplate().update(entity); ."TxX.&HE
} J &o|QG
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publicvoid delete(finalObject entity){ }'5MK
getHibernateTemplate().delete(entity); !SC`D])l
} bo,_&4?
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publicObject load(finalClass entity, i#&z2h-b
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finalSerializable id){ _mzW'~9wN
return getHibernateTemplate().load O#n8=B4
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(entity, id); ynmWW^dg
} 45=bGf#
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publicObject get(finalClass entity, n#/_Nz
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finalSerializable id){ mH54ja2
return getHibernateTemplate().get 5 z~1Dw
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(entity, id); ,oORW/0iS
} H ;7(}:.
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publicList findAll(finalClass entity){ b}OY4~ Y4
return getHibernateTemplate().find("from ~9?cn
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" + entity.getName()); a:+{f&
} &qLf@1AD
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publicList findByNamedQuery(finalString NO2XA\
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namedQuery){ x[4`fM.m*
return getHibernateTemplate AG3>V+k{Lv
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().findByNamedQuery(namedQuery); Gn22<C/
} E_gD:PPU5
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publicList findByNamedQuery(finalString query, fs|)l$Rd
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finalObject parameter){ VGLaN%|
return getHibernateTemplate !*/*8re
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().findByNamedQuery(query, parameter); yTyj'-4
} cO-7ke
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publicList findByNamedQuery(finalString query, ZkgV_<M|
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finalObject[] parameters){ :f Kl]XO
return getHibernateTemplate <i<J^-W
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().findByNamedQuery(query, parameters); Q.bXM?V)
} A_n7w
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publicList find(finalString query){ !y#"l$"xK
return getHibernateTemplate().find <3(LWxw
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(query); h}-3\8 >
} oYHj~t
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publicList find(finalString query, finalObject @<<<C?CTv
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parameter){ 3sc+3-TF
return getHibernateTemplate().find FK6[>(QO
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(query, parameter); D>|H 2
} E"\/M
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public PaginationSupport findPageByCriteria ml2_
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(final DetachedCriteria detachedCriteria){ t4{rb,
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return findPageByCriteria &6DMk-
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ?xK8#
} 1m+p;T$
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public PaginationSupport findPageByCriteria fz;iOjr>
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(final DetachedCriteria detachedCriteria, finalint YgKZ#?*
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startIndex){ H/,gro
return findPageByCriteria z|fmrwkN'$
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(detachedCriteria, PaginationSupport.PAGESIZE, r[1i*b$
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startIndex); ODZ5IO}v
} QS0:@.}$E)
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public PaginationSupport findPageByCriteria J5*tJoCYS
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(final DetachedCriteria detachedCriteria, finalint oV)~@0B&0
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pageSize, aGK?x1_
finalint startIndex){ @*>@AFnf\Z
return(PaginationSupport) )@N2
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getHibernateTemplate().execute(new HibernateCallback(){ [N1hWcfvd
publicObject doInHibernate h"`ucC8X
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(Session session)throws HibernateException { `(T,+T4C5k
Criteria criteria = v. %R}Pa
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detachedCriteria.getExecutableCriteria(session); jQk*8
int totalCount = pqUCqo!m\
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((Integer) criteria.setProjection(Projections.rowCount ,PlO8;5]
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()).uniqueResult()).intValue(); nv)2!mAh\
criteria.setProjection ;V^ 112|C
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(null); El<]b7
List items = Rfn9s(m
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criteria.setFirstResult(startIndex).setMaxResults h H <J,Wn
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(pageSize).list(); 0ph{
PaginationSupport ps = P-`M
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new PaginationSupport(items, totalCount, pageSize, 5?p2%KQ
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startIndex); U ?'vXa
return ps; YRv&1!VLE
} HN_d{ 3
}, true); TqNadHQ
} b5,x1`#7k
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public List findAllByCriteria(final wpN k+;
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DetachedCriteria detachedCriteria){ ;?W|#*=R
return(List) getHibernateTemplate Wf>zDW^"R
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().execute(new HibernateCallback(){ 6`!Fv-
publicObject doInHibernate 9k9_mjLZ
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(Session session)throws HibernateException { yvgrIdEP
Criteria criteria = )Y]{HQd
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detachedCriteria.getExecutableCriteria(session); t^`O{m<
return criteria.list(); 6``'%S'#
} z?>D_NLX6
}, true); :1 (p.q=
} YWMGB#=
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public int getCountByCriteria(final <F'X<Bau
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DetachedCriteria detachedCriteria){ hOFOO_byzO
Integer count = (Integer)
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getHibernateTemplate().execute(new HibernateCallback(){ :`E8Z:-R
publicObject doInHibernate $p#%G#T
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(Session session)throws HibernateException { 4VHqBQ4
Criteria criteria = ;^La"m
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detachedCriteria.getExecutableCriteria(session); ]BtbWKJBqe
return 6}4'E
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criteria.setProjection(Projections.rowCount ONx(]
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()).uniqueResult(); 53c 0
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} ?|WoIV.
}, true); !iH-#B-
return count.intValue(); 4&xZ]QC)O5
} DVah
} AgOp.~*Z~V
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用户在web层构造查询条件detachedCriteria,和可选的 6lkl7zm
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 &j?#3Qt'_
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PaginationSupport的实例ps。 <EPj$::
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ps.getItems()得到已分页好的结果集 uHH/rMV
ps.getIndexes()得到分页索引的数组 %7#-%{
ps.getTotalCount()得到总结果数 CNQC^d\ h
ps.getStartIndex()当前分页索引 TT50(_8
ps.getNextIndex()下一页索引 XW -2~?$
ps.getPreviousIndex()上一页索引 X/z6"*(|/
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 }Ow>dV?
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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 3uZJ.Fb
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一下代码重构了。 YLwnhy>dD
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我把原本我的做法也提供出来供大家讨论吧: D?C)BcN
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首先,为了实现分页查询,我封装了一个Page类: d0aC Y
java代码:
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/*Created on 2005-4-14*/ XYS'.6k(
package org.flyware.util.page; aFe`_cnG
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/** JYrY[',u
* @author Joa [q_`X~3
* txZ?=8j_Y
*/ neXeAU
publicclass Page { yu6`66h)
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/** imply if the page has previous page */ VtzI9CD
privateboolean hasPrePage; vKq^D(&cl
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/** imply if the page has next page */ Sr&515
privateboolean hasNextPage; -6tgsfEr
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/** the number of every page */ a 4=N9X
privateint everyPage; <+^6}8-
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/** the total page number */ Nru7(ag1~
privateint totalPage; qw7@(R'"
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/** the number of current page */ jn%!AH
privateint currentPage; ot`%*
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/** the begin index of the records by the current FuUD 61JHY
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query */ @*0cMO;SpG
privateint beginIndex; _bzqd"
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/** The default constructor */ @WQK>-=(3
public Page(){ G
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} xXY.AoO6
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/** construct the page by everyPage 'Q
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* @param everyPage 2+cNo9f
* */ ik"sq}u_]E
public Page(int everyPage){ l"q1?kaVg
this.everyPage = everyPage; /erN;Oo%<
} Dy]I8_
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/** The whole constructor */ 4\pWB90V
public Page(boolean hasPrePage, boolean hasNextPage, /wxE1][.
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int everyPage, int totalPage, 'qArf
int currentPage, int beginIndex){ =\,uy8HX
this.hasPrePage = hasPrePage; Fhv2V,nZ<
this.hasNextPage = hasNextPage; T1`|~Z?g-
this.everyPage = everyPage; C@Nv;;AlU
this.totalPage = totalPage; +&X%<S
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this.currentPage = currentPage; -w;(cE
this.beginIndex = beginIndex; 2>]a)
} T/c<23i
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/** K.%U
* @return c{>uqPTY
* Returns the beginIndex. /w8"=6Vv~
*/ fQ'.8'>T
publicint getBeginIndex(){ &m {kHM
return beginIndex; )-Ej5'iHr
} ?!=iu!J
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/** x lsqj`=
* @param beginIndex 4g}FB+[u
* The beginIndex to set. ZkP{[^6d\
*/ R*zO
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publicvoid setBeginIndex(int beginIndex){ !j1[$% =#
this.beginIndex = beginIndex; ygSL
} Um)>2|rp}
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/** 7l."b$U4yv
* @return MlJVeod
* Returns the currentPage. (>=7ng^
*/ 2/36dGFH
publicint getCurrentPage(){ 0Rz(|jlbS
return currentPage; ~gI{\iNF/
} "o&HE@t
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/** K9[e>
* @param currentPage wQ+dJ3b$
* The currentPage to set. U{~SXk'2+
*/ -h-oMqgu(
publicvoid setCurrentPage(int currentPage){ Z~6[ Z
this.currentPage = currentPage; G\/"}B:(
} mmEp'E
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/** ]DvO:tM
* @return |2`"1gt
* Returns the everyPage. =s}Xy_+:
*/ joa5|t!D9
publicint getEveryPage(){ QM5 .f+/
return everyPage; Ch_xyuJ
} _P,^_%}V06
Te{ *6-gO3
/** >p])it[q&$
* @param everyPage 6P`)%zj
* The everyPage to set. z *9FlV
*/ Ogg#jx(4
publicvoid setEveryPage(int everyPage){ /%n`V
this.everyPage = everyPage; |xr\H8:(!
} 1%J.WH6eQ
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/** ;pJ2V2 g8
* @return aF8k/$u
* Returns the hasNextPage. /}5B&TZ=(3
*/ T7$S_
publicboolean getHasNextPage(){ V5D2\n3A
return hasNextPage; wU`!B<,j
} yg;_.4TpIO
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/** *zVvQ=
* @param hasNextPage yPu4T6Vv
* The hasNextPage to set. (0Naf
*/ J?n<ydZSH
publicvoid setHasNextPage(boolean hasNextPage){ OQ4c#V?
this.hasNextPage = hasNextPage; -Dzsa
} f+Dn9t
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/** =y%rG :!
* @return ] c}91
* Returns the hasPrePage. !asqr1/
*/ 5IqQ |/m<6
publicboolean getHasPrePage(){ fT
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return hasPrePage; wk\L* \@Y}
} %do1i W
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/** \k.vN@K#
* @param hasPrePage ~ eN8|SR
* The hasPrePage to set. V/"}ku
*/ /&Jv,[2kV
publicvoid setHasPrePage(boolean hasPrePage){ z,*:x4}F
this.hasPrePage = hasPrePage; Di=9mHC
} beZ(o?uK
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/** O.k\]'
* @return Returns the totalPage. zuL7%qyv
* ,
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*/ N
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publicint getTotalPage(){ r$nkU4N'
return totalPage; h3Fo-]0
}
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/** en9en=n|
* @param totalPage |V`S>m%N
* The totalPage to set. Sl~x$9`
*/ X QbNH~
publicvoid setTotalPage(int totalPage){ <%bw/
this.totalPage = totalPage; _zC (J
} (TSqc5^H
~!+h?[miV
} V`fL%du,3
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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 VRS 2cc
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个PageUtil,负责对Page对象进行构造: +T_ p8W+j
java代码: o;J;*~g
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/*Created on 2005-4-14*/ t6u-G+}
package org.flyware.util.page; ~v:#zU
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import org.apache.commons.logging.Log; aIvBY78o
import org.apache.commons.logging.LogFactory; )teFS%
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/** T!(
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* @author Joa ER|!KtCSM
* Qp:6=o0:
*/ d$1#<