Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 q
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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 wegBMRQVp
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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 HkrNt/]
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分页支持类: ,-):&V:jF
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java代码: y=t
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package com.javaeye.common.util; (j(6%U
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import java.util.List; n'SnqJ&}
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publicclass PaginationSupport { l{<@[foc
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publicfinalstaticint PAGESIZE = 30; Y9ru~&/o$
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privateint pageSize = PAGESIZE; ujaaO6oZ7
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privateList items; MD +Q_
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privateint totalCount; Lr`yl$6
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privateint[] indexes = newint[0]; B{44|aq1 |
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privateint startIndex = 0; N)QW$iw9
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public PaginationSupport(List items, int !( /dbHB
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totalCount){ N*eZ4s'
setPageSize(PAGESIZE); G3q\Z`|3h
setTotalCount(totalCount); u
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setItems(items); Kg56.$
setStartIndex(0); E;yP.<PW
} ig6F!p
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public PaginationSupport(List items, int 8q_nOGd
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totalCount, int startIndex){ LVX.s tN#p
setPageSize(PAGESIZE); C&\#{m_1B
setTotalCount(totalCount); $aEL>,X
setItems(items); d%iMjY`~[g
setStartIndex(startIndex); gF&1e5`i
} T{Av[>M
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public PaginationSupport(List items, int n;[d{bU
[S4<bh!
totalCount, int pageSize, int startIndex){ U2;_{n*g%
setPageSize(pageSize); lwSA!W
setTotalCount(totalCount); k/>k&^?
setItems(items); Z<`QDBN"4
setStartIndex(startIndex); v81<K*w`P
} $%ps:ui~X
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publicList getItems(){ n* uT
return items; 3>ytpXUEGx
} J%{>I
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publicvoid setItems(List items){ `j9 ;9^
this.items = items; DKR2b`J
} Yf1?3(0O
nPE{Gp) }
publicint getPageSize(){ T< D&%)
return pageSize; ta%yQd7
} u{J$]%C
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publicvoid setPageSize(int pageSize){ W2'u]1bs
this.pageSize = pageSize; `KB; 3L
} tmKHT
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publicint getTotalCount(){ }gete'I
return totalCount; r[K%8Y8`
} wZ0RI{)s'
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publicvoid setTotalCount(int totalCount){ ;O+=
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if(totalCount > 0){ ]@0C1r
this.totalCount = totalCount; )1N~-VuT
int count = totalCount / y2KR^/LN|Y
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pageSize; 9!;/+P
if(totalCount % pageSize > 0) @P@?KZ..v!
count++; PKJ w%.-
indexes = newint[count]; ZwM(H[iqL
for(int i = 0; i < count; i++){ \I( g70
indexes = pageSize * ;X , A|m$(
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i; lxf+$Z`~:
} *lc|iq\
}else{ LtW}R4}3
this.totalCount = 0; ?L x*MJZ
} 1R-WJph
} 7_HFQT1.N
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publicint[] getIndexes(){ H}?"2jF
return indexes; id+ ~ V
} ?k@^U9?R
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publicvoid setIndexes(int[] indexes){ F$M^}vsjGx
this.indexes = indexes; pLSh
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} XlLG/N
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publicint getStartIndex(){ Ogv9_X8
return startIndex; ?.Q$@Ih0
} {>g{+Eq
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publicvoid setStartIndex(int startIndex){ s5h}MXIXw
if(totalCount <= 0) MroN=%|t
this.startIndex = 0; xIA] 5@;a
elseif(startIndex >= totalCount) pmRm&VgE.
this.startIndex = indexes KrdEB0qh
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[indexes.length - 1]; [4w*<({*
elseif(startIndex < 0) agt/;>q\~
this.startIndex = 0; Hsn'"
else{ z^vfha
this.startIndex = indexes qA0PGo
# ~Doz7~
[startIndex / pageSize]; sKCYGt$
} hi`[
} DG?g~{Y~b
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publicint getNextIndex(){ Qo32oT[DM
int nextIndex = getStartIndex() + ,BUrZA2\U$
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pageSize; ulE5lG0c
if(nextIndex >= totalCount) X!_&%^L'
return getStartIndex(); e>6|# d
else @Bds0t
return nextIndex; {7jl) x3l
} 60;_^v
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publicint getPreviousIndex(){ d~ +(g!
int previousIndex = getStartIndex() - EHN(K-
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pageSize; oqAO@<dL!
if(previousIndex < 0) aVCPaYe^
return0; {0~\ T[qm
else 4sRM"w;
return previousIndex; fV@[S
} z%S$~^=b
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} HjIIhl?UY
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抽象业务类 LN~mKoW
java代码: ]DKRug5
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/** /{f"0]-RA
* Created on 2005-7-12 T%%
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*/ 9dq"x[
package com.javaeye.common.business; )X-'Q -
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import java.io.Serializable; XwUa|"X6
import java.util.List; ?r KbL^2
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import org.hibernate.Criteria; PChe w3
import org.hibernate.HibernateException; 1aQm r=,
import org.hibernate.Session; $2\8Rn6'
import org.hibernate.criterion.DetachedCriteria; ~5'7u-;
import org.hibernate.criterion.Projections; s3eS` rK-
import -nXP<v=V
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org.springframework.orm.hibernate3.HibernateCallback; :h5G|^
import $m;`O_-T
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org.springframework.orm.hibernate3.support.HibernateDaoS 'y\Je7
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upport; g'KxjjYT,
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import com.javaeye.common.util.PaginationSupport; hH 5}%/vF
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public abstract class AbstractManager extends %ggf|\-e
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HibernateDaoSupport { )w0x{_
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privateboolean cacheQueries = false; @QV0l]H0+
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privateString queryCacheRegion; H.\`(`6
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publicvoid setCacheQueries(boolean Rjq Xz6
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cacheQueries){ :~ pGHl
this.cacheQueries = cacheQueries; 3l%Qd<
} KEtV
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publicvoid setQueryCacheRegion(String Xd=KBB[r?
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queryCacheRegion){ 9T;4aP>6j#
this.queryCacheRegion = >*RU:X
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queryCacheRegion; `*Yw-HL
} l3sF/zkH
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publicvoid save(finalObject entity){ _8a;5hS
getHibernateTemplate().save(entity); qS#G7~ur>y
} c`soVqT$?
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publicvoid persist(finalObject entity){ eJ99 W=
getHibernateTemplate().save(entity); Up{[baWF
} &1$d`>fn
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publicvoid update(finalObject entity){ R3~,&ab
getHibernateTemplate().update(entity); B:Ts_9*
} EY )2,
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publicvoid delete(finalObject entity){ j:h}ka/!p
getHibernateTemplate().delete(entity); sq!$+=1-X
} mY.v:
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publicObject load(finalClass entity, iX$G($[l(
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finalSerializable id){ #B;P4n3
return getHibernateTemplate().load ~Jk&!IE2
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(entity, id); tw_o?9
} 7q+D}+ Xf
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publicObject get(finalClass entity, T&lgWOls
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finalSerializable id){ =vbG'_[7
return getHibernateTemplate().get mux/\TII
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(entity, id); YI g(^>sq
} J?9jD:x
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publicList findAll(finalClass entity){ S MWXP
return getHibernateTemplate().find("from KLyRb0V
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" + entity.getName()); #7i*Diqf9
} z:>cQUYl
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publicList findByNamedQuery(finalString 5dePpF D5
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namedQuery){ fzIs^(:fl
return getHibernateTemplate ; ~pgF_
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().findByNamedQuery(namedQuery); J#I RbO)
} B&]`OO>O
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publicList findByNamedQuery(finalString query, qYC&0`:H
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finalObject parameter){ ZwkUd-=0i
return getHibernateTemplate Cz0FA]-g
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().findByNamedQuery(query, parameter); $*ff]>#
} DZSS
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publicList findByNamedQuery(finalString query, !Y ,7%
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finalObject[] parameters){ cUY-
return getHibernateTemplate iFd
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().findByNamedQuery(query, parameters); 3`bQ0-D;
} ;P91'B~t
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publicList find(finalString query){ /65YHXg,
return getHibernateTemplate().find -G(me"Cu
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(query); [E1qv;
} Y4rxnXGw
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publicList find(finalString query, finalObject .PB!1C.}@
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parameter){ rfqwxr45h
return getHibernateTemplate().find Pk;\^DRC
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(query, parameter); /j~~S'sw
} 5W&L6.J}+
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public PaginationSupport findPageByCriteria ]SQ+r*a
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(final DetachedCriteria detachedCriteria){ )x6&Y
return findPageByCriteria dKzG,/1W[m
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); wlXs/\es
} T#ls2UL*xh
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public PaginationSupport findPageByCriteria "`qk}n-
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(final DetachedCriteria detachedCriteria, finalint Bgxk>Y
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startIndex){ ,Kv6!ib6Q
return findPageByCriteria #
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(detachedCriteria, PaginationSupport.PAGESIZE, uj8saNu
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startIndex); QTHY{:Rmu
} t\M6 d6
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public PaginationSupport findPageByCriteria Z>g72I%X
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(final DetachedCriteria detachedCriteria, finalint Ok!P~2J
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pageSize, tx09B)0
finalint startIndex){ bBi>BP=
return(PaginationSupport) %p 6Ms
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getHibernateTemplate().execute(new HibernateCallback(){ %3`*)cp@
publicObject doInHibernate t/[2{'R4
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(Session session)throws HibernateException { jr`swyg
Criteria criteria = !]F`qS>
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detachedCriteria.getExecutableCriteria(session); b7sfr!t_d
int totalCount = W>jKWi,{
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((Integer) criteria.setProjection(Projections.rowCount A?MM9Y}K
TAYh#T=S
()).uniqueResult()).intValue(); Zz0er|9]Q
criteria.setProjection zK6w0
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(null); sPNm.W$_
List items = /nO_e
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criteria.setFirstResult(startIndex).setMaxResults && ]ix3
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(pageSize).list(); }ILBX4c
PaginationSupport ps = 2hHRitt36
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new PaginationSupport(items, totalCount, pageSize, z};|.N}
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startIndex); -
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return ps; v.RA{a 9
} -|V#U`mwF
}, true); }1 O"?6
} _gMr]%Q
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public List findAllByCriteria(final ?=7k<a~
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DetachedCriteria detachedCriteria){ z?DCQ
return(List) getHibernateTemplate yy5|8L
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().execute(new HibernateCallback(){ g[~{iu_$d
publicObject doInHibernate y(DT^>0
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(Session session)throws HibernateException { &<><4MQ
Criteria criteria = M[qhy.
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detachedCriteria.getExecutableCriteria(session); :
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return criteria.list(); ^|<>`i6
} kI"9T`owR
}, true); !>F70
} GbLHzw
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public int getCountByCriteria(final E]Mx<7;\.
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DetachedCriteria detachedCriteria){ "`;-5d g
Integer count = (Integer) T'6`A<`3
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getHibernateTemplate().execute(new HibernateCallback(){ (&.T
publicObject doInHibernate 1L`V{\_0s
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(Session session)throws HibernateException { Ys.GBSlHG
Criteria criteria = .-YE(}^
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detachedCriteria.getExecutableCriteria(session); f
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return 0:Bpvl5
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criteria.setProjection(Projections.rowCount R?1Z[N
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()).uniqueResult(); ^Zvb3RJ g
} a =W%x{
}, true); )&E]
return count.intValue();
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} yMdu
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} ;'Hu75ymo
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用户在web层构造查询条件detachedCriteria,和可选的 E-1u_7
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ;o'>`=Y
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PaginationSupport的实例ps。 z
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ps.getItems()得到已分页好的结果集 k5>UAea_
ps.getIndexes()得到分页索引的数组 +8xT}mX
ps.getTotalCount()得到总结果数 48z%dBmTT*
ps.getStartIndex()当前分页索引 o6^ETQ
ps.getNextIndex()下一页索引 TfJ*G6\7e#
ps.getPreviousIndex()上一页索引 uhj]le!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 v6G1y[Wl
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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 eaO'|@;{~
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一下代码重构了。 5MG4S
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我把原本我的做法也提供出来供大家讨论吧: b5MU$}:
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首先,为了实现分页查询,我封装了一个Page类: '0~?zP
java代码: 'DXT7|Df
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/*Created on 2005-4-14*/ 1.u^shc&|
package org.flyware.util.page; UUDbOxD^w
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/** /pkN=OBR
* @author Joa (xvg.Nby
* ..h@QQ
*/ q.R(>ZcV
publicclass Page {
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/** imply if the page has previous page */ $aEv*{$y
privateboolean hasPrePage; I*j~5fsS'
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/** imply if the page has next page */ [>>_%T\I
privateboolean hasNextPage; oQpGa>6U&
)?OdD7gd
/** the number of every page */ Kg~D~
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privateint everyPage; Qu Mv1)n
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/** the total page number */ uX!6:v]
privateint totalPage; O13]H"O_
{/)i}V#RE
/** the number of current page */ vN
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privateint currentPage; H!0m8LCnb
Z&?4<-@6\p
/** the begin index of the records by the current l
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query */ pRh9+1EM;
privateint beginIndex; o"0~
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/** The default constructor */ (e5Z^9X
public Page(){ T^MY w
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} !wUznyYwt
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/** construct the page by everyPage .|u`s,\
* @param everyPage ,[p pETz
* */ UAz^P6iQ`~
public Page(int everyPage){ E@otV6Wk[@
this.everyPage = everyPage; {S+?n[1r\
} D=vw0Q_3Y3
#b&tNZ4!_
/** The whole constructor */ pam9wfP
public Page(boolean hasPrePage, boolean hasNextPage, |15!D
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h{_\okC>
int everyPage, int totalPage, 2o9B >f&g
int currentPage, int beginIndex){ SJX9oVJeZ
this.hasPrePage = hasPrePage; `-CN\
this.hasNextPage = hasNextPage; {HM[ )t0
this.everyPage = everyPage; Jlb{1B$7
this.totalPage = totalPage; <z%**gP~G
this.currentPage = currentPage; &-o5lrq
this.beginIndex = beginIndex; lb9?Uc@
} #J3}H
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/** QjXJo$I6
* @return *k#"@
* Returns the beginIndex. f*"T]AX0
*/ M `q|GY
publicint getBeginIndex(){ XM+.Hel
return beginIndex; i"n_oO
} 0+1!-Wo
+1yi{!j1
/** L ?;UcCB
* @param beginIndex Kyk{:UnI
* The beginIndex to set. ZY7-.
*/ %E#Ubm!
publicvoid setBeginIndex(int beginIndex){ b==jlYa=
this.beginIndex = beginIndex; qov<@FvE0
} p*g)-/mA
un!v1g9O
/** 3O4lGe#u
* @return V;R gO}
* Returns the currentPage. g i/k#3_m
*/ MYb^G\K
publicint getCurrentPage(){ S?`0,F
return currentPage; r)-{~JA!
} Jb$G
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/** z]hRc8g}d
* @param currentPage ?mC'ZYQI
* The currentPage to set. kmTYRl
)j
*/ i)(G0/:
publicvoid setCurrentPage(int currentPage){ 2DsP "q79k
this.currentPage = currentPage; ?5ZvvAi
} &0[L2x}7
Opf)TAl{
/** ~a3u['B
* @return w (`g)`
* Returns the everyPage. /d6Rdl`w
*/ *XWu) >*o
publicint getEveryPage(){ <X{w^
cT_Q
return everyPage; b"#S92R+
} 2brY\c
F
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/** CeOA_M
* @param everyPage Go:(R {P
* The everyPage to set. !nJl.Y$
*/ am3JzH
publicvoid setEveryPage(int everyPage){ #E=8kbD7
this.everyPage = everyPage; i"
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} i Pr(X
VfJ{);
/** A9SL|9Q
* @return n2-+.9cY
* Returns the hasNextPage. ami>Pp
*/ OW=3t#"7Kp
publicboolean getHasNextPage(){ g8'8"9:xC
return hasNextPage; "]p&7
} DFZ@q=ZT
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/** ):tv V
* @param hasNextPage z]%@r 7
* The hasNextPage to set. Jia@HrLR
*/ {Y-'i;j?
publicvoid setHasNextPage(boolean hasNextPage){ 3k>#z%//
this.hasNextPage = hasNextPage; !wd
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} wDoCc:
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/** &@{`{
* @return dVMl;{
* Returns the hasPrePage. Ca?w"m~h
*/ sl$y&C-
publicboolean getHasPrePage(){ !<j4*av:G
return hasPrePage; ZBY}Mz$
} L3Y2HZ
E$:2AK{*
/** "WGKwi=W
* @param hasPrePage la)+"uW
* The hasPrePage to set. dn])6Xl;i
*/ 0Qeda@J
publicvoid setHasPrePage(boolean hasPrePage){ S?i^ ~
this.hasPrePage = hasPrePage; O\o@]
} Cb<7?),vK
@V^.eVM\R
/** $U7/w?gc'
* @return Returns the totalPage. sVP\EF8PY
* OPq|4xu
*/ ,-EN{ed
publicint getTotalPage(){ Z|UVH
return totalPage; *wmkcifF;
} nIB eZof
qA!4\v={
/** \pK&gdw
* @param totalPage ?Q=(?yR0]
* The totalPage to set. am.d^'
*/ ;}S_ PnwC@
publicvoid setTotalPage(int totalPage){ k
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this.totalPage = totalPage; 6 mLC{X[
} {P?DkUO}
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} 1#"wfiW
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 F:<+}{Av
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个PageUtil,负责对Page对象进行构造: RYC%;h
java代码: Ym]g0a
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/*Created on 2005-4-14*/ 'CqAjlj
package org.flyware.util.page; k)F!gV#
r/ATZAgHP
import org.apache.commons.logging.Log; "
@""
import org.apache.commons.logging.LogFactory; ^qC.bv]&
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/** og+Vrd
* @author Joa mGP%"R2X
* }mZCQJ#`
*/ ^_G#JJ\@$
publicclass PageUtil { &"tQpw5
ny^uNIRPR
privatestaticfinal Log logger = LogFactory.getLog q |Pebe=
=w _T{V
(PageUtil.class); qa~ju\jm.
/#_[{lSr?
/** l1 08.ao
* Use the origin page to create a new page G&wYV[Ln
* @param page
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* @param totalRecords d9e~><bPJ
* @return {#z47Rz
*/ 4Vf-D%
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publicstatic Page createPage(Page page, int ;VCFDE{K=
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totalRecords){ x3Fn'+
return createPage(page.getEveryPage(), AoxORPp'
4TU\SP8sM
page.getCurrentPage(), totalRecords); ?_S);
} bfJ<~ss/
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/** [!KsAsmk
* the basic page utils not including exception *}(B"FSO
r_'];
handler !.@:t`w
* @param everyPage 4^Ks!S>K{8
* @param currentPage T DPQ+Kg_
* @param totalRecords G6Wa0Z
* @return page g;o5m}
*/ k-s|gC4
publicstatic Page createPage(int everyPage, int cqZlpm$c
7I(QTc)*
currentPage, int totalRecords){ c(3idO*R)
everyPage = getEveryPage(everyPage); 2"Unk\Y
currentPage = getCurrentPage(currentPage); jgpF+V-n$
int beginIndex = getBeginIndex(everyPage, MbTmdRf
1)N#
currentPage); LG(" <CU
int totalPage = getTotalPage(everyPage, vPy."/[u
yMgS0
totalRecords); /k\)q
boolean hasNextPage = hasNextPage(currentPage, eeBw\f0
Ix=(f0|
totalPage); !]7L9TGn
boolean hasPrePage = hasPrePage(currentPage); ky]L`w
]wbV1Y"
returnnew Page(hasPrePage, hasNextPage, 3<a|_(K
everyPage, totalPage, fx^yC.$2
currentPage, l0',B*og
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beginIndex); $Zrc-tkV
} YO@~y*,
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privatestaticint getEveryPage(int everyPage){ G-o6~"J\
return everyPage == 0 ? 10 : everyPage; G&6`?1k
} kOel
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privatestaticint getCurrentPage(int currentPage){ \Q?#^<