Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 =ejcP&-V/
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 IOHWb&N6
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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 ?q!4 REM
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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 M6-uTmN:d
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分页支持类: B)q }]Qn
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java代码: iwnGWGcuS
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package com.javaeye.common.util; ~<1s[Hu
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import java.util.List; +*.*bo
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publicclass PaginationSupport { eC/{c1C
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publicfinalstaticint PAGESIZE = 30; \3vQXt\dM$
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privateint pageSize = PAGESIZE; v&:[?<6-
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privateList items; g}~s"Sz
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privateint totalCount; |
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privateint[] indexes = newint[0]; +v/y{8Fu
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privateint startIndex = 0; GW
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public PaginationSupport(List items, int V@0T&#
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totalCount){ .H|Z3d!Jj
setPageSize(PAGESIZE); -#%M,Qb
setTotalCount(totalCount); w&@tP^`
setItems(items); :{<|,3oNdR
setStartIndex(0); Q
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} c@>ztQU*
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public PaginationSupport(List items, int 2IJniS=[>
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totalCount, int startIndex){ /J}G{Y
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setPageSize(PAGESIZE); $2FU<w$5
setTotalCount(totalCount); U*nB=
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setItems(items); wQW`Er3w
setStartIndex(startIndex); "1|geO|
} G5hRx@vfrL
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public PaginationSupport(List items, int /
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totalCount, int pageSize, int startIndex){ (bm>
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setPageSize(pageSize); Dp['U
setTotalCount(totalCount); Pjq'c+4.yL
setItems(items); LcLHX
setStartIndex(startIndex); kRggVRM
} *L?~
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publicList getItems(){ t<Sa;[+
return items; 0SD'&
} Xf ^_y(?
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publicvoid setItems(List items){ !ak760*A
this.items = items; ;(mNjxA
} *v#V%_ o
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publicint getPageSize(){ /y1+aTiJ
return pageSize; )E9c6'd
}
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publicvoid setPageSize(int pageSize){ 1.%|Er 4
this.pageSize = pageSize; ]U@~vA#''
} jhRr!
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publicint getTotalCount(){ ;Q3[} ]su
return totalCount; b1^wK"#
} L=54uCv
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publicvoid setTotalCount(int totalCount){ V+D <626o
if(totalCount > 0){ it{Jd\/hR
this.totalCount = totalCount; {'alA
int count = totalCount / ftmPdha%+
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pageSize; 7.2G}O6$
if(totalCount % pageSize > 0) RKzO$T
count++; ZxOo&YR3
indexes = newint[count]; :tbI=NDb
for(int i = 0; i < count; i++){ cK[=IE5
indexes = pageSize * I[rR-4.F]
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i; X<_HQ
}
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}else{ N, u]2,E
this.totalCount = 0; {oOUIP
} 6yYjZ<
} %qsl<_&
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publicint[] getIndexes(){ M8:i ]
return indexes; D,*|:i
}
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publicvoid setIndexes(int[] indexes){ RU#}!Kq
this.indexes = indexes; hrJ(] [8
} G8'{nPA~
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publicint getStartIndex(){ IkmEctAU
return startIndex; k|>yFc
} @}PXBU
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publicvoid setStartIndex(int startIndex){ ^?]-Q*w3Qs
if(totalCount <= 0) a/s5Oit2'X
this.startIndex = 0; Y8%l)g
elseif(startIndex >= totalCount) $XcH.z
this.startIndex = indexes AJ}m2EH
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[indexes.length - 1]; ;t9!<L
elseif(startIndex < 0) UM0Ws|qx&
this.startIndex = 0; D9;pjY
else{ vC1fKo\p
this.startIndex = indexes A
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* BrGh
[startIndex / pageSize]; h$sOJs~6h
} GwXhn2
} s%rmfIp"
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publicint getNextIndex(){ Nk7=[y#z
int nextIndex = getStartIndex() + z80(+`
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pageSize; #?\(l%
if(nextIndex >= totalCount) atd;)o0*0
return getStartIndex(); ,j{tGj_
else ]7TOA$Q
return nextIndex; UsA fZg8
} ;:oXe*d
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publicint getPreviousIndex(){ a0k;way
int previousIndex = getStartIndex() - ]iW:YNvXA
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pageSize; ^B%ki
if(previousIndex < 0) .*`]x
return0; @J>JZ7m]\
else <7)sS<I
return previousIndex; H}_R `S
} [%yj'
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} %${$P+a`D
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抽象业务类 =rZ'!Pa
java代码: ]zAwKuIK
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/** /~".GZ&29
* Created on 2005-7-12 CvZ\Z472.j
*/ N3lz-vP-
package com.javaeye.common.business; ?zC{T*a
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import java.io.Serializable; IIT[^_g
import java.util.List; R|$b\3
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import org.hibernate.Criteria; %rhZH^2
import org.hibernate.HibernateException; p-\->_9)y`
import org.hibernate.Session; D/"velV
import org.hibernate.criterion.DetachedCriteria; KX;JX*)J
import org.hibernate.criterion.Projections; ?Bq^#i|m
import 8 3/WWL }
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org.springframework.orm.hibernate3.HibernateCallback; zjow %
import /;}%E
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org.springframework.orm.hibernate3.support.HibernateDaoS j[R.UB3J
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upport; tw.GBR
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import com.javaeye.common.util.PaginationSupport; Nr]Fh
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public abstract class AbstractManager extends hi$AZ+
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HibernateDaoSupport { 'ZI8nMY
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privateboolean cacheQueries = false; }ssja,;
}6.@
privateString queryCacheRegion; W,H8B%e
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publicvoid setCacheQueries(boolean g-UCvY
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cacheQueries){ o9sPyY$aQ
this.cacheQueries = cacheQueries; <"K*O9nst
} z7sDaZL?_
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publicvoid setQueryCacheRegion(String j%y{d(Q4
g"|>^90
queryCacheRegion){ |kvH`&s
this.queryCacheRegion = L~;(M6Jp
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queryCacheRegion; zdU46|!u
} "9c=kqkX
b+:J?MR;}
publicvoid save(finalObject entity){ .QKyB>s
getHibernateTemplate().save(entity); RjvW*'2G
} =9 )k:S(
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publicvoid persist(finalObject entity){ y9d"sqyh
getHibernateTemplate().save(entity); 3+uL@LXd
} *-Yw%uR
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publicvoid update(finalObject entity){ =$)M-;6
getHibernateTemplate().update(entity); \$.{*f
}
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publicvoid delete(finalObject entity){ d,l?{Ln
getHibernateTemplate().delete(entity); *5k40?w
} ]OdZlZBsJ
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publicObject load(finalClass entity, .?QYqGcG
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finalSerializable id){ %>=6v}f,+
return getHibernateTemplate().load P[G>uA>Z1
# >bj6<
(entity, id); 6*>Lud
} @j}%{Km]Y
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publicObject get(finalClass entity, ;9h;oB@
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finalSerializable id){ D@68_sn
return getHibernateTemplate().get O8bxd6xb
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(entity, id); =HsE:@
} Q*%}w_D6f
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publicList findAll(finalClass entity){ 2 HQ3G~U
return getHibernateTemplate().find("from LYRpd
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" + entity.getName()); #L+:MA7H
} h,m 90Hd+
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publicList findByNamedQuery(finalString
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namedQuery){ Z#H<+S(
return getHibernateTemplate =s4(Y
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().findByNamedQuery(namedQuery); A|+QUPD
} /IRXk[
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publicList findByNamedQuery(finalString query, Qw'905;(
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finalObject parameter){ BXYH&2]Q
return getHibernateTemplate Wj(#!\ 7F
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().findByNamedQuery(query, parameter); thJ~*
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} 6u+aP
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publicList findByNamedQuery(finalString query, m]AT-]*f
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finalObject[] parameters){ OQKeU0v
return getHibernateTemplate '{jr9Vh
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().findByNamedQuery(query, parameters); _i+@HXR &
} ={ms@/e/T
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publicList find(finalString query){ p8!T)
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return getHibernateTemplate().find A'KH_])
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(query); _/I">/ivlM
} ?PT>V,&
@ps(3~?7
publicList find(finalString query, finalObject nlNk
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parameter){ :HO5
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return getHibernateTemplate().find z2uL[deN'"
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(query, parameter); pqfX}x
} R^*baiXVI
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public PaginationSupport findPageByCriteria ?qaWt/m
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(final DetachedCriteria detachedCriteria){ ]h,rgO;
return findPageByCriteria
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Q-
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} s;Gd`-S>d
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public PaginationSupport findPageByCriteria T^1
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(final DetachedCriteria detachedCriteria, finalint +
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startIndex){ _VKI@
return findPageByCriteria cl%+m
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(detachedCriteria, PaginationSupport.PAGESIZE, Mu?|<#s
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startIndex); {6zNCO
} g F*AS(9
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public PaginationSupport findPageByCriteria Kp`{-dUf
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(final DetachedCriteria detachedCriteria, finalint XVN`J]XHk
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pageSize, ?q:|vt
finalint startIndex){ QJVbt
return(PaginationSupport)
}~/b%^
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getHibernateTemplate().execute(new HibernateCallback(){ 43PLURay
publicObject doInHibernate u=.8M`FxP
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(Session session)throws HibernateException { i41~-?Bc
Criteria criteria = <(xqw<)
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detachedCriteria.getExecutableCriteria(session); %y6(+I#P
int totalCount = Qq<@;4
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((Integer) criteria.setProjection(Projections.rowCount &J>e;X
N*o{BboK;
()).uniqueResult()).intValue(); UZyg_G6
criteria.setProjection q!ZM Wg
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(null); !ZYPz}&N_
List items = `x[Is$
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criteria.setFirstResult(startIndex).setMaxResults y7,I10:D
=SfNA
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(pageSize).list(); >rCD5#DG
PaginationSupport ps = {o}U"b<+Ra
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new PaginationSupport(items, totalCount, pageSize, [IL*}M!
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startIndex); @NL cO}
return ps; 9n&
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} ?b;2PH"
}, true); $Nu{c;7"
} }/cReX,so
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public List findAllByCriteria(final 1RRE{]2v#
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DetachedCriteria detachedCriteria){ X Q#K1Z
return(List) getHibernateTemplate v>8C}d^
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().execute(new HibernateCallback(){ ]`/>hH>+~9
publicObject doInHibernate %QezC+n
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(Session session)throws HibernateException { )+G"57p
Criteria criteria = K^u,B3
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detachedCriteria.getExecutableCriteria(session); tbFAVGcAM
return criteria.list(); iW5cEI%tb
} q/#e6;x
}, true); ]r
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} YOl$sgg}
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public int getCountByCriteria(final F]\
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DetachedCriteria detachedCriteria){ lPy|>&Yc
Integer count = (Integer) V8^la'_j
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getHibernateTemplate().execute(new HibernateCallback(){ FK _ ZE>
publicObject doInHibernate *w+'I*QSt~
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(Session session)throws HibernateException { \SWTP1
Criteria criteria = *uc/| c
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detachedCriteria.getExecutableCriteria(session); ^A$=6=CX
return DrJ?bG;[
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criteria.setProjection(Projections.rowCount gHg=G+Q@
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()).uniqueResult(); \|HEe{nA
} *~#I5s\s!
}, true); my (@~'
return count.intValue(); QAs)zl0
} fAsb:P
} U,Z\)+-R
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用户在web层构造查询条件detachedCriteria,和可选的 1}(22Q;
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 O~3
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PaginationSupport的实例ps。 L;Ff(0x|
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ps.getItems()得到已分页好的结果集 :zY4phR
ps.getIndexes()得到分页索引的数组 2"IV
ps.getTotalCount()得到总结果数 4V@%Y,:ee
ps.getStartIndex()当前分页索引 Q:A#4Z
ps.getNextIndex()下一页索引 nLN0zfhE#
ps.getPreviousIndex()上一页索引 HpnF,4A>
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 dY8 H2;
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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 [l}H:%O,
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一下代码重构了。 zp}7p~#k^
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我把原本我的做法也提供出来供大家讨论吧: Q((&Q?Vi
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首先,为了实现分页查询,我封装了一个Page类: Qit&cnO
java代码: `16'qc
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/*Created on 2005-4-14*/ _*mn4n=
package org.flyware.util.page; P5Xp #pa
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/** IiPX`V>RC
* @author Joa [\8rh^LFi
* VGS%U8;
*/ L!}!k N:?
publicclass Page { `<7\Zl
$$9H1)Ny
/** imply if the page has previous page */ [JOa^U=
privateboolean hasPrePage; yGa0/o18!?
(?z?/4>7<
/** imply if the page has next page */ @%4'2b
privateboolean hasNextPage; cYSn
=H{<}>W'
/** the number of every page */ 7`|'Om?'
privateint everyPage; |Z:yd}d
> Pw5!i\
/** the total page number */ LU6R"c11
privateint totalPage; \e86'&
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/** the number of current page */ vk7IqlEQ
privateint currentPage; ]IuZ T
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/** the begin index of the records by the current 5rsz2;#p
ufXWK3~\
query */ "Bd-h|J
privateint beginIndex; 9g6$"',H
[ V.67_~
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/** The default constructor */ /~,*DH$)
public Page(){ Ao K9=F}
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} [jgVN w""D
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/** construct the page by everyPage "r^RfZ;
* @param everyPage a%%7Ew ?
* */ EyK!'9~a
public Page(int everyPage){ M5I`i{Gw
this.everyPage = everyPage; g QBS#NY
} T+Yv5l
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/** The whole constructor */ )1At/ mr
public Page(boolean hasPrePage, boolean hasNextPage, a6Vfd&
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int everyPage, int totalPage, *7AB0y0k
int currentPage, int beginIndex){ Ii0\Skb
this.hasPrePage = hasPrePage; B^2r4
9vC
this.hasNextPage = hasNextPage; 5{=+S]
this.everyPage = everyPage; -Q? i16pM
this.totalPage = totalPage; [n"eD4 )K|
this.currentPage = currentPage; Xt$qjtVM
this.beginIndex = beginIndex; 6wp1jN
} ?mNB:-Q
Uh/=HNR
/** 1>*oN
* @return N@thewt|
* Returns the beginIndex. Kbu>U{'
*/ <X*oW ".
publicint getBeginIndex(){ & AK\Pw)
return beginIndex; ]!ai?z%cK#
} %{
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h1~h&F?
/** S)hDsf.I
* @param beginIndex aen%
* The beginIndex to set. AZ.QQ*GZ#y
*/ d9[j4q_
publicvoid setBeginIndex(int beginIndex){ YP,,vcut
this.beginIndex = beginIndex; a;[\ nCK
} EjfQF C
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/** b
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* @return i*$+>3Q-
* Returns the currentPage. &4OOW;,?<
*/ L}
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publicint getCurrentPage(){ >/-H!jUF]
return currentPage; $}vk+.!*1
} tav@a)
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/** JV_`E_!
* @param currentPage "|JbdI]%P
* The currentPage to set. xoVd[c!
*/ .u mqyU~
publicvoid setCurrentPage(int currentPage){ c#x~x
this.currentPage = currentPage; <lzC|>BG
} OV{v6,>O
:2j`NyLI.
/** RQ=rB9~:ZN
* @return U*+-#
* Returns the everyPage. 18X?CoM~
*/ h1S)B|~8
publicint getEveryPage(){ (?Ko:0+*
return everyPage; .6MG#N
} hTa X@=Ra
P4B|l:
/** qt9jZtx
* @param everyPage =|J*9z;
* The everyPage to set. 0_qr7Ui8(
*/ =mLp g4
publicvoid setEveryPage(int everyPage){ 5QqU.9M
this.everyPage = everyPage; ;?q(8^A
} u^xnOVE
UG\2wH_
/** k2eKs*WLC
* @return 'A|c\sy
* Returns the hasNextPage. 6r"NU`1A;r
*/ QyCrz{/
publicboolean getHasNextPage(){ TDw~sxtv&
return hasNextPage; E^J &?-
} tD`^qMua
wfO-bzdw
/** ,q%X`F
rc
* @param hasNextPage 0WzoI2Q
* The hasNextPage to set. yLf9cS6=
*/
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publicvoid setHasNextPage(boolean hasNextPage){ ItLR|LO9
this.hasNextPage = hasNextPage; 62nmm/c
} Kz
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/** W?SAa7+
* @return I;}U/'RR>
* Returns the hasPrePage. ^+-QY\N
j
*/ Mxw-f4j
publicboolean getHasPrePage(){ [? "hmSJ
return hasPrePage; !Gnm<|.
} ^/Hf$tYI!`
hpQ #`rhn
/** Yt*NIwWr
* @param hasPrePage .@x.
* The hasPrePage to set. bq5ySy{8
*/ (~Bm\ Jn
publicvoid setHasPrePage(boolean hasPrePage){ L[PqEN\i
this.hasPrePage = hasPrePage; )'jGf;du
} M#Z^8(
] K&ca
/** H.M:
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* @return Returns the totalPage. xY)eU;*
* pS-o*!\C.
*/ r;b `@
.
publicint getTotalPage(){ n<|8Onw
return totalPage; gna!Q
} q=e;P;u
<zY#qFQ2
/** V|A.M-XLv4
* @param totalPage De3;}]wC
* The totalPage to set. c|:EMYS
*/ aNM*=y`
publicvoid setTotalPage(int totalPage){ Q0`@=5?-
this.totalPage = totalPage; }+lK'6
} \_u{ EB'b
rhzI*nwOT
} B t3++ Mj
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~i?Jg/qcxN
~tTa[_ a!
o1 27? ^
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 8yYag[m8
qPi $kecx
个PageUtil,负责对Page对象进行构造: p]X+#I<
java代码: D*46,>Tv
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/*Created on 2005-4-14*/ z1tD2jL _
package org.flyware.util.page; pqv l,G5
(=rDt93J
import org.apache.commons.logging.Log; E\Wd*,/v)
import org.apache.commons.logging.LogFactory; _`C|K>:
us5Zi# }
/** K
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* @author Joa rp
@%0/[
* )s7 EhIP
*/ "=%YyH~WY
publicclass PageUtil { xP9R
d/xa|
IecD41%
privatestaticfinal Log logger = LogFactory.getLog 8WLh7[
y+wy<[u
(PageUtil.class); i`6utOq
S\ZCZ0
/** RKMF?:
* Use the origin page to create a new page 41B.ZE+*qd
* @param page VwBw!,%Ab
* @param totalRecords 7^)yo#i4
* @return [$$R>ELYQ
*/ ;E{@)X..|
publicstatic Page createPage(Page page, int qc'KQ5w7!
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totalRecords){ kyJKai
return createPage(page.getEveryPage(), p? +!*BZ
ZQR)k:k7
page.getCurrentPage(), totalRecords); A$~H`W<yxB
} i+Ne.h
u<n['Ur}|
/** W#d'SL#5
* the basic page utils not including exception [vBP,_Tjx
tOF8v8Hd
handler kSJ;kz,_
* @param everyPage ?TDmW8G}J
* @param currentPage O d6'bO;G
* @param totalRecords taVK&ohWx
* @return page ^755LW
*/ @VND}{j
publicstatic Page createPage(int everyPage, int 1*#hIuoj'
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currentPage, int totalRecords){ )abH//Pps.
everyPage = getEveryPage(everyPage); &a >UVs?=
currentPage = getCurrentPage(currentPage); '&|%^9O/"
int beginIndex = getBeginIndex(everyPage, &B+_#V=X@
*c.w:DkfB
currentPage); /gaC
int totalPage = getTotalPage(everyPage, o{2B^@+Vb
x
`%x f
totalRecords); /ml+b8@
boolean hasNextPage = hasNextPage(currentPage, K)Ya%%6[U#
55y}t%5
totalPage); $Zi{1w
boolean hasPrePage = hasPrePage(currentPage); >Ir?)h
( t"|XSF
returnnew Page(hasPrePage, hasNextPage, +U1fa9NSn
everyPage, totalPage, t=fAG,k5
currentPage, &"1 _n]JO
O#^qd0e'P!
beginIndex); sV%=z}n=
} frQ=BV5%6
EN>a^B+!
privatestaticint getEveryPage(int everyPage){ 4dz Ym+vJm
return everyPage == 0 ? 10 : everyPage; (:+Wc^0
} m*e8j[w#
qIy9{LF
privatestaticint getCurrentPage(int currentPage){ Vn^8nS
return currentPage == 0 ? 1 : currentPage; *=%`f=
} /byF:iYI
'oBv(H
privatestaticint getBeginIndex(int everyPage, int Cb|R
'o8,XBv-
currentPage){ hR>`I0|p&
return(currentPage - 1) * everyPage; ]'#^ ~.
} 2C_I3S~U
d|
{<SRAI
privatestaticint getTotalPage(int everyPage, int }6__E;h#J
6il+hz2&lH
totalRecords){ !cO<N~0*5x
int totalPage = 0; )Ps<u- V
grd
fR`3
if(totalRecords % everyPage == 0) #b&=CsW`
totalPage = totalRecords / everyPage; aXbj pb+
else hg^klQD
totalPage = totalRecords / everyPage + 1 ; NUi&x