Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 OfD@\;L
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 +7Sf8tg\
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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 GMEw
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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 :_MP'0QP
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分页支持类: M_tj7Q3
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java代码: vz6SCGg,
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package com.javaeye.common.util; 1pWk9Xuh
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import java.util.List; d0'7efC+
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publicclass PaginationSupport { T48BRVX-F
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publicfinalstaticint PAGESIZE = 30; ]AFj&CteZ/
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privateint pageSize = PAGESIZE; ~GSpl24W<
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privateList items; (gLea
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privateint totalCount; YQN.Ohtv*F
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privateint[] indexes = newint[0]; 3b#L17D3_
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privateint startIndex = 0; }|AX_=a
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public PaginationSupport(List items, int |Es0[cU
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totalCount){ 3*G5F}7%=
setPageSize(PAGESIZE); {!lNL[x
setTotalCount(totalCount); P_Z M'[
setItems(items); P2O\!'aEh
setStartIndex(0); uG4$2
} O97VdNT8
bk.*k~_
public PaginationSupport(List items, int w_\nB}_
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totalCount, int startIndex){ j]AekI4I
setPageSize(PAGESIZE); ?'Cb-C_
setTotalCount(totalCount); hMv2"V-X
setItems(items); 'Cg V0&@
setStartIndex(startIndex); >xZ5ac
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} d60c$?"]a(
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public PaginationSupport(List items, int ^,LtEwd~Y
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totalCount, int pageSize, int startIndex){ TFo}\B7
setPageSize(pageSize); )GK+
setTotalCount(totalCount); !-7_ +v>
setItems(items); \]t]#D>0
setStartIndex(startIndex); 5~QhX22
} tbg*_ZQO u
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publicList getItems(){ xF&6e&nv
return items; ]}.0el{
} VXA[TIqp
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publicvoid setItems(List items){ Cc2MYm8
this.items = items; :Pc(DfkS
} 3+e4e
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publicint getPageSize(){ ,}KwP*:Z
return pageSize; -ovoRI^6`}
} ea2 `q
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publicvoid setPageSize(int pageSize){ 0',[J
this.pageSize = pageSize; M%3Wy"YQ,n
} GKCM|Y
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publicint getTotalCount(){ hzq5![/sV
return totalCount; >:A<"wZ
} as(; ]
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publicvoid setTotalCount(int totalCount){ ;uK";we
if(totalCount > 0){ *<7l!#
this.totalCount = totalCount; g@Ld"5$^2
int count = totalCount / &Bm&i.r
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pageSize; BGN9,ii
if(totalCount % pageSize > 0) G?R_aPP
count++; ,[Ag~.T
indexes = newint[count]; 1&|
for(int i = 0; i < count; i++){ P8<hvMF
indexes = pageSize * ~}K{e
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i; ;I+H>$%jZ
} vTHq)C.7G
}else{ !3@{U@*Z]
this.totalCount = 0; v$;@0t:;#
} Je 31".
} Od-Ax+Hp
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publicint[] getIndexes(){ /9Z!p
return indexes; M1EOnq4-
} #~S>K3(
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publicvoid setIndexes(int[] indexes){ 68p R:
this.indexes = indexes; F_v-}bbcFQ
} T{tn.sT
*,&S' ,S-
publicint getStartIndex(){ 9n"V\e_R
return startIndex; Kr]z]4.d@
} kutJd{68
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publicvoid setStartIndex(int startIndex){ ^&NN]?
if(totalCount <= 0) e8-ehs>
this.startIndex = 0; t3a#%'Dv
elseif(startIndex >= totalCount) SB/3jH
this.startIndex = indexes n+rM"Gxz
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[indexes.length - 1]; @D]lgq[
elseif(startIndex < 0) yPN+W8}f
this.startIndex = 0; C `6S}f,
else{ Mb.4J2F ?
this.startIndex = indexes H{%H^t>
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[startIndex / pageSize]; *{|$FQnR>(
} oqYt/4^Q
} `7\H41%\pp
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publicint getNextIndex(){ 'g hys1H
int nextIndex = getStartIndex() + VX!hv`E
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pageSize; /tZ0
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if(nextIndex >= totalCount) -?z\5z
return getStartIndex(); @$c!/
else @Z q[e
return nextIndex; G\ex^&M
} x[x(y{&~
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publicint getPreviousIndex(){ c0ZaFJ
int previousIndex = getStartIndex() - N&m_e)E5c
5gshKmt_
pageSize; V&iS~V0.
if(previousIndex < 0) wDKELQ(yH
return0; >vAN(3Idu
else 0X>T+A[E
return previousIndex; uY]0dyI
} |'$ l7
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} R5kH0{zM
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抽象业务类 jT-<IJh!o
java代码: V{ |[oIp
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/** PIxjM>
* Created on 2005-7-12 3AeH7g4<
*/ [0!{_E)<
package com.javaeye.common.business; :c:V%0Yji
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import java.io.Serializable; WFDCPQ@
import java.util.List; "V}qf3qU
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import org.hibernate.Criteria; 4K7{f+T
import org.hibernate.HibernateException; cz(G]{N
import org.hibernate.Session; 2Wl{Br.
import org.hibernate.criterion.DetachedCriteria; wE6A
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import org.hibernate.criterion.Projections; 328L)BmW
import V|: qow:F
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org.springframework.orm.hibernate3.HibernateCallback; lDN?|YG
import z_n\5.
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org.springframework.orm.hibernate3.support.HibernateDaoS no&-YktP}
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upport; th
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import com.javaeye.common.util.PaginationSupport; f^e&hyC
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public abstract class AbstractManager extends ;;Tq$#vd
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HibernateDaoSupport { t!qwxX*$T
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privateboolean cacheQueries = false; 1EsqQz*$u
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privateString queryCacheRegion; 7 :U8 f:
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publicvoid setCacheQueries(boolean l"\uf(0K
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cacheQueries){ m&/=&S
this.cacheQueries = cacheQueries; ~kb{K;
} PeNF+5s/K
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publicvoid setQueryCacheRegion(String R=$Ls6z
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queryCacheRegion){ h<NRE0-
this.queryCacheRegion = 8Z8Y[p
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queryCacheRegion; G~!C=l
} (B}+h
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publicvoid save(finalObject entity){ fp;a5||5
getHibernateTemplate().save(entity); m~>@BCn;
} [W;[v<E;
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publicvoid persist(finalObject entity){ KB[QZ`"%!
getHibernateTemplate().save(entity); |GuEGmR
} (/?R9T[V&^
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publicvoid update(finalObject entity){ (>AFyh&3,X
getHibernateTemplate().update(entity); Dbz]{_Y;
} 0roCP=;
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publicvoid delete(finalObject entity){ Ac\W\=QvB
getHibernateTemplate().delete(entity); <|H?gfM
} m UgRm]
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publicObject load(finalClass entity, _tWE8r,
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finalSerializable id){ q-IWRb0j%a
return getHibernateTemplate().load v8'5pLt"
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(entity, id); =x
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} 2C1+_IL
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publicObject get(finalClass entity, *s\sa+2al
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finalSerializable id){ .'lN4x
return getHibernateTemplate().get 3dm'xetM
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(entity, id); jdlG#j-\
} mHs:t{q
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publicList findAll(finalClass entity){ @]?R2bI
return getHibernateTemplate().find("from aU(tu2
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" + entity.getName()); r0btC@Hxy
} D9o*8h2$
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publicList findByNamedQuery(finalString 5\S&)ZA@
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namedQuery){ h=[-Er'B
return getHibernateTemplate xa#gWIP*
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().findByNamedQuery(namedQuery); Pux)>q] C
} @T7PZB&xnl
, N
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publicList findByNamedQuery(finalString query, J"&y|;G
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finalObject parameter){ 9h&yuS'Yj
return getHibernateTemplate NvHN -^2
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().findByNamedQuery(query, parameter); {^m5#f 0"
} P(;Mb{
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publicList findByNamedQuery(finalString query, hdg<bZk:
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finalObject[] parameters){ P)1EA;
return getHibernateTemplate ?Ib}
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().findByNamedQuery(query, parameters); \h#9oPy
} sHs g_6~
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publicList find(finalString query){ >'Hx1;
return getHibernateTemplate().find |yv]Y/=
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(query); ^Y 7U1I
} ZNL5({lv
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publicList find(finalString query, finalObject xJc.pvVPw
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parameter){ FL&dv
return getHibernateTemplate().find s<VJ`Ur
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(query, parameter); a}yR p
} VDn:SGj5
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public PaginationSupport findPageByCriteria <kbnu7?a*
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(final DetachedCriteria detachedCriteria){ la`"$f
return findPageByCriteria Hirr=a3
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ZIW7_Y>_
} K~@`o-Z[
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public PaginationSupport findPageByCriteria ]_#SAhOR)
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(final DetachedCriteria detachedCriteria, finalint 0BDS_Rx
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startIndex){ rKIRNc#d
return findPageByCriteria 24X=5Aj
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(detachedCriteria, PaginationSupport.PAGESIZE, yHOqzq56
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startIndex); "XB4yExy
} A]xCF{*)&
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public PaginationSupport findPageByCriteria xVTo4-[p
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(final DetachedCriteria detachedCriteria, finalint PW)8aLU
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pageSize, .hne)K%={y
finalint startIndex){ hgwn> p:S#
return(PaginationSupport) oG\>--
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getHibernateTemplate().execute(new HibernateCallback(){ SwJHgZ&
publicObject doInHibernate r\RFDj
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(Session session)throws HibernateException { Om6Mmoqh
Criteria criteria = niAZ$w
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detachedCriteria.getExecutableCriteria(session); #G~wE*VR$
int totalCount = RNe9h lr
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((Integer) criteria.setProjection(Projections.rowCount Ys%'#f
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()).uniqueResult()).intValue(); FE}s#n_Pd
criteria.setProjection kwc*is
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(null); )w3
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List items = D}Au6
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criteria.setFirstResult(startIndex).setMaxResults PJ;.31u
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(pageSize).list(); B'#4;R!8P=
PaginationSupport ps = iLQSa7
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new PaginationSupport(items, totalCount, pageSize, F {/>u(@3
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startIndex); *?p
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return ps; $r):d
} Lz?*B$h
}, true); 6"%@L{UQ
} Z,SY
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public List findAllByCriteria(final bl`D+/V
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DetachedCriteria detachedCriteria){ 6N?#b66
return(List) getHibernateTemplate 1y~L8!:L
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().execute(new HibernateCallback(){ gY%OhYtF2
publicObject doInHibernate qL,ka
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(Session session)throws HibernateException { (HPz
Criteria criteria = )# p.`J
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detachedCriteria.getExecutableCriteria(session); 3jXR"@Z-
return criteria.list(); J ZA*{n2
} e|JIrOnc
}, true); e) ]RA?bF
} pbPz$Y
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public int getCountByCriteria(final dDo6fP2
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DetachedCriteria detachedCriteria){ m^'~&!ba
Integer count = (Integer) o:H'r7N
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getHibernateTemplate().execute(new HibernateCallback(){ ]I8]mUiUH
publicObject doInHibernate hcQSB00D^
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(Session session)throws HibernateException { O%52V|m}{
Criteria criteria = 27Cz1[oX
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detachedCriteria.getExecutableCriteria(session); 3Fgz)*Gu]
return )U]:9)
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criteria.setProjection(Projections.rowCount +;YE)~R?
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()).uniqueResult(); J}:&eS
} ed=n``P~}
}, true); IeH^Wm&^
return count.intValue(); dV)Y,Yx0${
} X=JFWzC
} WFRsSp2
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用户在web层构造查询条件detachedCriteria,和可选的 &<`-:x1 2_
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 re]%f"v:5
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PaginationSupport的实例ps。 J_|7$
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ps.getItems()得到已分页好的结果集 JR])xPI`
ps.getIndexes()得到分页索引的数组 !X%S)VSMU
ps.getTotalCount()得到总结果数 ZT r:xX{R6
ps.getStartIndex()当前分页索引 Wa(W&]
ps.getNextIndex()下一页索引 Rq"VB.ef&{
ps.getPreviousIndex()上一页索引 dJloH)uJZ>
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 =sxkr ih
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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 Tc9&mKVE%(
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一下代码重构了。 TFNUv<>X
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我把原本我的做法也提供出来供大家讨论吧: )uANmThOz
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首先,为了实现分页查询,我封装了一个Page类: ;9}w|!/
java代码: o1
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/*Created on 2005-4-14*/ G}182"#4
package org.flyware.util.page; C\y[&egww
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/** )>ug{M%g
* @author Joa "w>rlsT<O
* tX@0:RX%
*/ ]^Sd9ba
publicclass Page { th5
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/** imply if the page has previous page */ cR,'o'V/
privateboolean hasPrePage; ?$UH9T9)
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/** imply if the page has next page */ +G<}JJ'V
privateboolean hasNextPage; J>&[J!>r
h1n*WQ-
/** the number of every page */ &\JK%X.Jlt
privateint everyPage; /TzNdIv
%=laY_y
G
/** the total page number */ lq;
privateint totalPage; /7c2OI=\
<sm#D"GpP
/** the number of current page */ $5ZR[\$
privateint currentPage; eL<m.06cfY
<l*agH-.3
/** the begin index of the records by the current rd XCWK$E
P]|J?$1K
query */ y2oB]^z&n
privateint beginIndex; 1[26w_B3
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/** The default constructor */ 3 %z
public Page(){ H|grbTv,
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} Is4%}J!8
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/** construct the page by everyPage ^`l"'6
* @param everyPage {
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* */ Hlz'a1\:O]
public Page(int everyPage){ pw0Px
this.everyPage = everyPage; |Dl*w/n
} }@3Ud'
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/** The whole constructor */ 5x:Ift
*
public Page(boolean hasPrePage, boolean hasNextPage, ck(CA(_
<f7?PAd
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int everyPage, int totalPage, bRx2
c
int currentPage, int beginIndex){ ?| D$#{^
this.hasPrePage = hasPrePage; \pjRv
this.hasNextPage = hasNextPage; Fg_?!zR>6
this.everyPage = everyPage; m-:8jA?
this.totalPage = totalPage; 5}vRo;-
this.currentPage = currentPage; vF5wA-3&t
this.beginIndex = beginIndex; 8
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} yd7lcb
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/** Y}AmX
* @return ap Fs UsE
* Returns the beginIndex. *ge].E
*/ W,QnU d'N
publicint getBeginIndex(){ *>H M$.?Q
return beginIndex; L9E;Uii0
} l=oN X"l=
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/** 6Cz7A
* @param beginIndex AyQS4A.s[
* The beginIndex to set. w$w>N(e
*/ N&6_8=3z
publicvoid setBeginIndex(int beginIndex){ Z7tU0
this.beginIndex = beginIndex; .`oJcJ
} b&\3ps
/#S4espE
/** W&fW5af9
* @return @4 zi]v
* Returns the currentPage. I-RdAVB/Ep
*/ hQgk.$g
publicint getCurrentPage(){ FRl3\ZDqrb
return currentPage; 'hwV
} U%mkhWn
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/** 6F|Hg2tpz
* @param currentPage _n-VgPRn
* The currentPage to set. 3q~":bpAp
*/ P!`Q_h6a
publicvoid setCurrentPage(int currentPage){ c8bca`
this.currentPage = currentPage; 7\7 Brw4
} ?z \q Mu
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/** .ujs`9d_-
* @return \_*?R,$3Y,
* Returns the everyPage. uM6CG0
*/ (PCimT=5
publicint getEveryPage(){ |<|28~#
return everyPage; n/9 LRZD|w
} ^ l]]qdNr
=:xV(GK}
/** 'Z*\1Ci
* @param everyPage jI*}y[o
* The everyPage to set. QLn5#x~xb
*/ KuIt[oM
publicvoid setEveryPage(int everyPage){ e.)yV'%L
this.everyPage = everyPage; EIq{C-(
} Ze$^UR
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/** i Q]T+}nn_
* @return <Um1h:^
* Returns the hasNextPage. fP^W"y
*/ ,wwU`
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publicboolean getHasNextPage(){ ..P=D <'f
return hasNextPage; Zd[y+$>
} 2.fyP"P
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/** 2]of SdM
* @param hasNextPage ,XWay%8{E
* The hasNextPage to set. G"T;l"TAt8
*/ ,\sR;=svK
publicvoid setHasNextPage(boolean hasNextPage){ w6WGFQ_ %
this.hasNextPage = hasNextPage; W%Y.SP$Y
} <;$Sa's,LE
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/** _1w.B8Lyz@
* @return E)&NP}k-P
* Returns the hasPrePage. 1=9qAp;?o
*/ r+{!@`dYi
publicboolean getHasPrePage(){ E"9/YWv
return hasPrePage; ugIm:bg&
} 38x[Ad4%
^D]7pe
/** 9[t]]
* @param hasPrePage ({d,oU$>y
* The hasPrePage to set. c t2_N
*/ "v\ bMuS
publicvoid setHasPrePage(boolean hasPrePage){ x[GFX8h(k6
this.hasPrePage = hasPrePage; `@fhge
} XhlI|h-j
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/** zumR( <l
* @return Returns the totalPage. 'mBLf&fB
* %KabyvOl)
*/ g[=\KrTSg
publicint getTotalPage(){ .-C+0L1j
return totalPage; E>l#0Zw
} 2R_opbw
^G'yaaLXR
/** haEZp6Z
* @param totalPage *#prSS
* The totalPage to set. \28b_,i+
*/ bBeFL~
publicvoid setTotalPage(int totalPage){ mR"2
this.totalPage = totalPage; K^]?@oHO
} Mv7w5vTl
FT3,k&i
} 75hFyh;u
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k$$S!qi#
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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 =\Tud-1Z
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个PageUtil,负责对Page对象进行构造: l(krUv
java代码: 0M/\bEG(_
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/*Created on 2005-4-14*/ bOdsMlJkN
package org.flyware.util.page; 3IU$
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import org.apache.commons.logging.Log; m&3HFf
import org.apache.commons.logging.LogFactory; .swgXiRvs
J#Ne:Aj_
/** PoBukOv
* @author Joa NR;S3-Iq(
* z/P^-N>
*/ o3TBRn,
publicclass PageUtil {
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privatestaticfinal Log logger = LogFactory.getLog NSiYUAug
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(PageUtil.class); 6,g5To#vw
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/** N)
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* Use the origin page to create a new page 1v[#::Bs
* @param page _Sk<S
* @param totalRecords ;8%@Lan
* @return Ivt)Eg
*/ ?VOs:sln
publicstatic Page createPage(Page page, int ?Qo_
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totalRecords){ c~0VNuN
return createPage(page.getEveryPage(), eHnei F
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page.getCurrentPage(), totalRecords); 5EV8zf
} qs8K jG@
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/** {Gb)Et]<
* the basic page utils not including exception &>) `P[x
A\PV@w%Ai
handler .f.j >
* @param everyPage ZAnO$pA
* @param currentPage 4Ow
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* @param totalRecords o{-USUGj7
* @return page *NwKD:o
*/ }07<(,0n
publicstatic Page createPage(int everyPage, int !g8.8(/t)
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currentPage, int totalRecords){ *{;A\sL
everyPage = getEveryPage(everyPage); @h7GTA \
currentPage = getCurrentPage(currentPage); ]uj.uWD
int beginIndex = getBeginIndex(everyPage, `X.=uG+m
v-r[~
currentPage); ("P mB?20
int totalPage = getTotalPage(everyPage, u
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totalRecords); "]\":T
boolean hasNextPage = hasNextPage(currentPage, BorfEv} SN
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totalPage); 5f`XFe$8
boolean hasPrePage = hasPrePage(currentPage); cnUU1Uz>
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returnnew Page(hasPrePage, hasNextPage, -)vp&-
everyPage, totalPage, n]ppO
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currentPage, c&I,eds
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beginIndex); z_,]fd=o
} kAQ\t?`x
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privatestaticint getEveryPage(int everyPage){ <2@<r
t{
return everyPage == 0 ? 10 : everyPage; - m x3^
} n5,Pq+[
&<