Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ce\d35x!
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 J;>epM;*
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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 1z8"Gk6
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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 >n09K8
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分页支持类: />S^`KSTM
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java代码: C K7([>2
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package com.javaeye.common.util; :>fT=$i@
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import java.util.List; sr6BC.
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publicclass PaginationSupport { Y.Zd_,qy
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publicfinalstaticint PAGESIZE = 30; <l5i%?
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privateint pageSize = PAGESIZE; nv:Qd\UM
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privateList items; k\ #;
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privateint totalCount; H:c5
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privateint[] indexes = newint[0]; (lM,'
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privateint startIndex = 0; 9S|sTf
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public PaginationSupport(List items, int $K^l=X
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totalCount){ (I}owr 5:
setPageSize(PAGESIZE); eK:?~BI!
setTotalCount(totalCount); wN!\$i@E:
setItems(items); P?h1nxm`'
setStartIndex(0); T/'z,,Y
} $IE}fgA@5
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public PaginationSupport(List items, int AabQ)23R2
=PRQ3/?5
totalCount, int startIndex){ z^QrIl/<c2
setPageSize(PAGESIZE); n?@zp<
setTotalCount(totalCount); s=n4'`y1
setItems(items); ^w^e~0
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setStartIndex(startIndex); <!sLfz?
} @Ul3J )=m
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public PaginationSupport(List items, int epiviCYC
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totalCount, int pageSize, int startIndex){ n=<c_a)Nb
setPageSize(pageSize); K<J,n!zc
setTotalCount(totalCount); #BLHHK/[
setItems(items); AZ3T#f![L@
setStartIndex(startIndex); .|O T#"LP
} /q IQE&V-
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publicList getItems(){ ))=6g@(
return items; eC!=4_lx)
} S oeoUI]m
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publicvoid setItems(List items){ RTc@`m3 M
this.items = items; 4^W!,@W
} Ku,wI86
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publicint getPageSize(){ U*C^g}iA
return pageSize; d0 )725Ia
}
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publicvoid setPageSize(int pageSize){ C1D:Xi-
this.pageSize = pageSize; y47N(;vy
} \V$qAfP)
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publicint getTotalCount(){ \}jA1oy
return totalCount; 3*h"B$g!
} lJdBUoO
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publicvoid setTotalCount(int totalCount){ wo0j/4o
if(totalCount > 0){ O^MI073Q>t
this.totalCount = totalCount; \t!~s^ Oox
int count = totalCount / ,JZ>)(@)
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pageSize; r E m/Q!
if(totalCount % pageSize > 0) oy8jc];SO
count++; /2?
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indexes = newint[count]; [on_=N{W[
for(int i = 0; i < count; i++){ V5K/)\#
indexes = pageSize * 0>od1/`
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} "QnYT3[l"
}else{ c~vhkRA
this.totalCount = 0; %hSQ\T<8[o
} j,j|'7J%
} "TA0--6
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publicint[] getIndexes(){ h+W$\T)
return indexes; 'f6H#V*C
} @[g7\d
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publicvoid setIndexes(int[] indexes){ O t)}:oG
this.indexes = indexes; &4:R(]|
} M(a%Qk?]/
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publicint getStartIndex(){ lOt7ij(,L
return startIndex; e-rlk5k%f
} MZV$YD^S
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publicvoid setStartIndex(int startIndex){ +.!D>U$)}
if(totalCount <= 0) a$=~1@
this.startIndex = 0; @s1T|}AJ
elseif(startIndex >= totalCount) 6M
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this.startIndex = indexes 4Fft[S(
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[indexes.length - 1]; CGi;M=xr
elseif(startIndex < 0) v@=qVwX
this.startIndex = 0; 5GM-*Ak @
else{ ,>-j Ztm
this.startIndex = indexes !h.hJt
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[startIndex / pageSize]; 9O 'j+?(`@
} FaeKDbLJr
} 9vV==A#
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publicint getNextIndex(){ AXlVH%'
int nextIndex = getStartIndex() + S~3|1Hw*tN
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pageSize; Rf!v{\
if(nextIndex >= totalCount) UH MJ(.Wa-
return getStartIndex(); +Vk L?J
else 8._uwA<[
return nextIndex; IAQ<|3Q
} (F&LN!Hn>p
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publicint getPreviousIndex(){ b=5w>*
int previousIndex = getStartIndex() - 3Z?ornS
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pageSize; TLsF c^X
if(previousIndex < 0) {5B j*m5
return0; q}t]lD
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else @:?[R&`
return previousIndex; d^=)n-!T
} tu}!:5xi
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} "K(cDV Q
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抽象业务类 ~P'.R.e
java代码: ^.6yzlY
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/** _bCAZa&&
* Created on 2005-7-12 !i torSl
*/ q@wD@_
package com.javaeye.common.business; #uU(G\^T
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import java.io.Serializable; dy_Uh)$$|g
import java.util.List; ;O}%SCF7
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import org.hibernate.Criteria; |#_p0yPy
import org.hibernate.HibernateException; w x]?D%l
import org.hibernate.Session; Onq^|r's&
import org.hibernate.criterion.DetachedCriteria; `PbY(6CF
import org.hibernate.criterion.Projections; DO(};R%=
import 8_}t,BC
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org.springframework.orm.hibernate3.HibernateCallback; 0''p29
import O]tR~a
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org.springframework.orm.hibernate3.support.HibernateDaoS 66&uK|
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upport; W/,bz",v3
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import com.javaeye.common.util.PaginationSupport;
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public abstract class AbstractManager extends 5[4wN(
)
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HibernateDaoSupport { -*k2:i`
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privateboolean cacheQueries = false; <J<"`xKL
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privateString queryCacheRegion; ,,uhEoH
*,z/q6
publicvoid setCacheQueries(boolean s>/Xb2\
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cacheQueries){ YIRe__7-NU
this.cacheQueries = cacheQueries; n}UJ-\$
} q=W.82.U
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publicvoid setQueryCacheRegion(String wnC} TWxX
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queryCacheRegion){ j{Px}f(=
this.queryCacheRegion = }!_z\'u
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queryCacheRegion; HXU#Ux
} 8lM=v> Xc
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publicvoid save(finalObject entity){ *>a=ku:?
getHibernateTemplate().save(entity); W On<;'}M&
} bN/8 ~!
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publicvoid persist(finalObject entity){ W^8
getHibernateTemplate().save(entity); d` ttWWPw
} h,$CJdDY]
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publicvoid update(finalObject entity){ 7dY_b
getHibernateTemplate().update(entity); 6B8!}6Ojc
} .T3N"}7[
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publicvoid delete(finalObject entity){ 5@xR`g-
getHibernateTemplate().delete(entity);
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} Ga5s9wC
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S}
publicObject load(finalClass entity, b\0>uU
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finalSerializable id){ fx|d"VF[
return getHibernateTemplate().load t}k:wzZ@
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(entity, id); f,yl'2{
} dE"_gwtX
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publicObject get(finalClass entity, w8X5kk
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finalSerializable id){ l+6c|([
return getHibernateTemplate().get 8e-nzc,]
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(entity, id); 6m$X7;x}
} <KX9>e
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publicList findAll(finalClass entity){ 9HJYrzf{%
return getHibernateTemplate().find("from oH w!~c7
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" + entity.getName()); uMDd Zj&
} $=.%IJ_MAz
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publicList findByNamedQuery(finalString .L^*9Y0)
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namedQuery){ 9;LjM ~Ct
return getHibernateTemplate fJr
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().findByNamedQuery(namedQuery); OpaRQ=
} :j`f%Vg~x
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publicList findByNamedQuery(finalString query, `R2Iw
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finalObject parameter){ UWO3sZpU
return getHibernateTemplate /V*SI!C<f
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().findByNamedQuery(query, parameter); {LjzkXs
} ^>E>\uz0v
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publicList findByNamedQuery(finalString query, !U%
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finalObject[] parameters){ [TA.|7&
return getHibernateTemplate /!0&b?
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().findByNamedQuery(query, parameters); kKlNhP(
} OvT[JpV
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publicList find(finalString query){ {{G3^ysa
return getHibernateTemplate().find AM=,:k$
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(query); [ifw}(
} 0JtM|Mg
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publicList find(finalString query, finalObject .bY>++CAPA
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parameter){ I8!>7`L
return getHibernateTemplate().find u)Kiwa
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(query, parameter); f~W+Rt7o
} 9_wDh0b~p
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public PaginationSupport findPageByCriteria C:No ^nH>
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(final DetachedCriteria detachedCriteria){ ~E6sY
return findPageByCriteria eikZ~!@
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Z&>Cdgt*
} .<?7c!ho
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public PaginationSupport findPageByCriteria |9XoRGgXU
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(final DetachedCriteria detachedCriteria, finalint e'uC:O.u
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startIndex){ KH)-=IJ8
return findPageByCriteria ?ja%*0
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(detachedCriteria, PaginationSupport.PAGESIZE, gd
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startIndex); 3U^Vz9LW
} j~Pwt9G
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public PaginationSupport findPageByCriteria DX! dU'tj
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(final DetachedCriteria detachedCriteria, finalint <5%*"v
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pageSize, odca?
finalint startIndex){ ! $mY.uu
return(PaginationSupport) pNd`fV#jX
#C }+
getHibernateTemplate().execute(new HibernateCallback(){ I)yaR+l
publicObject doInHibernate }O+xs3Uv
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(Session session)throws HibernateException { <xSh13<
Criteria criteria = &-FG}|*4M
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detachedCriteria.getExecutableCriteria(session); f|(9+~K/7&
int totalCount = Il4]1d|
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((Integer) criteria.setProjection(Projections.rowCount ~x(|'`
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()).uniqueResult()).intValue(); 3r#['UmT
criteria.setProjection W*s=No3C
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(null); \mLEwNhRY
List items = `W}pAmhj
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criteria.setFirstResult(startIndex).setMaxResults oU,8?(}'~
9O&m7]3
(pageSize).list(); z*.G0DFw
PaginationSupport ps = 423%K$710
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new PaginationSupport(items, totalCount, pageSize, LhKbZoPp
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startIndex); 00D.Jn
return ps; ;bG?R0a
} jMBMqQNU
}, true); ?J+jv
} p>pN?53S
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public List findAllByCriteria(final l?"^2in.
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DetachedCriteria detachedCriteria){ /-!Fr:Ox>
return(List) getHibernateTemplate O)V;na
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().execute(new HibernateCallback(){ h-"q <eY"
publicObject doInHibernate *=B<S/0
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(Session session)throws HibernateException { 4Ia'Yr
Criteria criteria = ,<+:xl
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detachedCriteria.getExecutableCriteria(session); |LJv*
return criteria.list(); @TW:6v`
} v&G9HiH
}, true); ,&3+w~Ua
} Y(`Bc8h
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public int getCountByCriteria(final ):4)8@]5M
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DetachedCriteria detachedCriteria){ 5"40{3
Integer count = (Integer) \nP79F0%2
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getHibernateTemplate().execute(new HibernateCallback(){ 4y}z+4
publicObject doInHibernate [ <d~b*/
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(Session session)throws HibernateException { ea @
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Criteria criteria = 7;@YR
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detachedCriteria.getExecutableCriteria(session); GIYdI#0RC
return !wE% <Fh
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criteria.setProjection(Projections.rowCount "LDNkw'
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()).uniqueResult(); jTqJ(M}L
} Zjn1,\(t~u
}, true); rtJ@D2Hj^
return count.intValue(); b(mZ/2,B
} < ~CY?
} 4J`-&05O
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用户在web层构造查询条件detachedCriteria,和可选的 g,*fpk
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 27[e0 j
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PaginationSupport的实例ps。 p cUccQ
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ps.getItems()得到已分页好的结果集 xS/=9l/G
ps.getIndexes()得到分页索引的数组 X`&Us
ps.getTotalCount()得到总结果数 V6ECL6n
ps.getStartIndex()当前分页索引 q2|z
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ps.getNextIndex()下一页索引 JcP<@bb>B
ps.getPreviousIndex()上一页索引 HL[V}m
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 $B>L_~cS
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 f]2gjQHM
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一下代码重构了。 y#Nrq9r:
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我把原本我的做法也提供出来供大家讨论吧: p}GTOJT}
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首先,为了实现分页查询,我封装了一个Page类: *S<I!7Q
java代码: gBI?dw
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/*Created on 2005-4-14*/ k-*k'S_
package org.flyware.util.page; A ?~4Pe
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/** z-0
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* @author Joa t':*~b{V@7
* 70*yx?T V
*/ &SZAe/3+
publicclass Page { "lA$;\&
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/** imply if the page has previous page */ u0+<[Ia'q
privateboolean hasPrePage; )('{q}JxV
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s
/** imply if the page has next page */ WV|9d}5
privateboolean hasNextPage; },5LrX`L
[A!=Hv_$
/** the number of every page */ H lFVc
privateint everyPage; {![E)~
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/** the total page number */ LWM& k#i
privateint totalPage; 86&r;c:
`i!-@WN"
/** the number of current page */ )d
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privateint currentPage; Y'6P ~C;v
u4=ulgi
/** the begin index of the records by the current ;rCCkA6
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query */ 'i/"D8
privateint beginIndex; nM$-L.dG
@M }`nKXM
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/** The default constructor */ TSL/zTLDJ
public Page(){ mp]UUpt
#eI`l`}
} $U_1e'
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/** construct the page by everyPage %s%e5hU
* @param everyPage QmPHf*w[
* */ TlQ5'0&I
public Page(int everyPage){ Tkf4`Gxd
this.everyPage = everyPage; %%O_:@9x,
} c$hoqi |tD
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/** The whole constructor */ t&bE/i_T
public Page(boolean hasPrePage, boolean hasNextPage, .|kp`-F51
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int everyPage, int totalPage, g'eJN
int currentPage, int beginIndex){ 4~:D7",Jn
this.hasPrePage = hasPrePage; s.}:!fBk
this.hasNextPage = hasNextPage; {-5b[m(
this.everyPage = everyPage; Zf\It<zT5
this.totalPage = totalPage; `jFvG\aC
this.currentPage = currentPage; a<D]Gz^h
this.beginIndex = beginIndex; [;INVUwG^
} MES| iB
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/** 0jefV*3qpB
* @return '-X913eG!
* Returns the beginIndex. bzMs\rj\
*/ "l09Ae'V
publicint getBeginIndex(){ w+ibY
return beginIndex; YC~kq?
} p7)b@,
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/** QNm.8c$
* @param beginIndex \?.M1a[
* The beginIndex to set. Uefw
*/ obIYC
publicvoid setBeginIndex(int beginIndex){ h@?BA<'S
this.beginIndex = beginIndex; QW%BKF!
} [@t 6,g
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/** B7qiCX}pD
* @return lT]dj9l
* Returns the currentPage. Ed~2Qr\65
*/ D8_-Dvp7H
publicint getCurrentPage(){ {~d8_%:b
return currentPage;
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} ~dqEUu!C
*(@[E
/** rU1{a" {
* @param currentPage $y*["~TJ
* The currentPage to set. 5/{gY{
*/ =l9H]`T/
publicvoid setCurrentPage(int currentPage){ =}AwA5G
this.currentPage = currentPage; A|U_$!cLZ
} D3%`vqu&
vo DTU]pf
/** jG3i
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* @return r*l:F{
* Returns the everyPage. Aa/lKiiz
*/ lN^} qg><
publicint getEveryPage(){ nM)H2'%kL&
return everyPage; [P_1a`b
} @oL<Ioh
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/** pn~$u
* @param everyPage \uV;UH7qe
* The everyPage to set. FPPGf!Eq
*/ NLxsxomj
publicvoid setEveryPage(int everyPage){ Q:B :
this.everyPage = everyPage; pb5'5X+
} Dy@f21+
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/** &Qdd\h#
* @return l;g8_uyjv7
* Returns the hasNextPage. sf5koe
*/ az]S&\i7T
publicboolean getHasNextPage(){ =' cr@[~i
return hasNextPage; 4RqOg1
} uU]4)Hp
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/** pJ#R :#P
* @param hasNextPage :bgi*pR{
* The hasNextPage to set. WV"{oED
*/ 8V(#S:G35
publicvoid setHasNextPage(boolean hasNextPage){ Q04iuhDO:
this.hasNextPage = hasNextPage; x+9aTsZ
} GxGZxf*(
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/** 8W"~>7/>D
* @return eS
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* Returns the hasPrePage. *lIK?" mo
*/ `_'I 9,.a
publicboolean getHasPrePage(){ vF K&.J
return hasPrePage; z<jWy$Ta;
} vF=d`T<
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/** ,wlh0;,
* @param hasPrePage XoaB X2
* The hasPrePage to set. f&Bu_r
*/ of^N4
publicvoid setHasPrePage(boolean hasPrePage){ ;
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this.hasPrePage = hasPrePage; )*iSN*T8q
} jn#
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/** ET`;TfqM
* @return Returns the totalPage. xXu/CGzG
* >i4UU0m
*/ Rd5r~iT
publicint getTotalPage(){ G?MNM -2
return totalPage; 7b,u|F
} >w?O?&Q$
J~:/,'Ea
/** mYN|)QVKy
* @param totalPage &Fl^&&1C
* The totalPage to set. zTP3JOe(
*/ l
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publicvoid setTotalPage(int totalPage){ 4y+]V~p
this.totalPage = totalPage; 7@m
} dQt*/]{q
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} XH0R:+s
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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 n}yqpW!%n
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个PageUtil,负责对Page对象进行构造: x1$tS#lS
java代码: mD)_quz.sk
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/*Created on 2005-4-14*/ M*E4:A9_M
package org.flyware.util.page; r$6z{Na\[
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import org.apache.commons.logging.Log; UPPDs "
import org.apache.commons.logging.LogFactory; y2^r.6"O
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/** l0b Y
* @author Joa R {+Rvk
* 3Cwqy#X#8
*/ VWmZ|9Ri
publicclass PageUtil { o;\0xuM@
v.,C"^W
privatestaticfinal Log logger = LogFactory.getLog {JzX`Z30l
8Hs>+Udl
(PageUtil.class); Y'Jb@l`$-
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/** ~^IS{1
* Use the origin page to create a new page /z,sM"d
* @param page z8mR< q%`
* @param totalRecords q0w5ADd
* @return z_<
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*/ %"DEgIP
publicstatic Page createPage(Page page, int 6lq7zi}'w
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totalRecords){ DCmNxN
return createPage(page.getEveryPage(), $d!Sl
a
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/0'/
page.getCurrentPage(), totalRecords); M\8FjJ>9
} 3`k1
ho@f}4jhQ3
/** _pKW($\
* the basic page utils not including exception -";'l@D=
VA)3=82n
handler M:nXn7)+
* @param everyPage |z|5j!Nfh
* @param currentPage l0u6nGkh
* @param totalRecords MlsF?"H p
* @return page 9 YU7R)
*/ 7
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publicstatic Page createPage(int everyPage, int $[[6N0}*:
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currentPage, int totalRecords){ B.K"1o
everyPage = getEveryPage(everyPage); VE6T&fz`
currentPage = getCurrentPage(currentPage); yK0Q,
int beginIndex = getBeginIndex(everyPage, Yk:fV &]
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currentPage); Y+V*$73`
int totalPage = getTotalPage(everyPage, <2ffcBv
lyIstfRh15
totalRecords); _$wWKJy9
boolean hasNextPage = hasNextPage(currentPage, i?'HVx
}!& w<wR
totalPage); /^#k/z
boolean hasPrePage = hasPrePage(currentPage); E[t\LTt*n
,u{d@U^)3@
returnnew Page(hasPrePage, hasNextPage, bu%@1:l
everyPage, totalPage, )Bl% {C
currentPage, (Y'rEc#H&z
ph30 /*8
beginIndex); l`gRw4/$
} 3>0/WbA:7E
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privatestaticint getEveryPage(int everyPage){ R?>a UFM
return everyPage == 0 ? 10 : everyPage; -t?S:9[w
} g;\zD_":l
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privatestaticint getCurrentPage(int currentPage){ ~VUNN[
return currentPage == 0 ? 1 : currentPage; PFG):i-?
} Z,,Da|edH
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privatestaticint getBeginIndex(int everyPage, int ZHICpL
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currentPage){ Vs8os+
return(currentPage - 1) * everyPage; X5qU>'?`
} wv
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privatestaticint getTotalPage(int everyPage, int ZGzrh`j{-
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totalRecords){ ;#3!ZB:}
int totalPage = 0; Uv[:Aj
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if(totalRecords % everyPage == 0) 1b;Aru~l
totalPage = totalRecords / everyPage; 2j4VW0:
else X||oiqbY
totalPage = totalRecords / everyPage + 1 ; v=i[s
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return totalPage; Trbgg
} =d7 lrx+z
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privatestaticboolean hasPrePage(int currentPage){ "KW\:uc /
return currentPage == 1 ? false : true; =NF},j"
} 05DK-Wh?
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privatestaticboolean hasNextPage(int currentPage, '8i
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int totalPage){ Puily9#
return currentPage == totalPage || totalPage == uMPJ
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0 ? false : true; > g8;x#
} z:RwCd1\
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} <R*.T)Z 1
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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。 "]kaaF$U%
V`S6cmwdc\
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 GZXUB0W\@)
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做法如下: L;fhJ~r
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 O#Xq0o
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的信息,和一个结果集List: #2_phm'
java代码: D
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/*Created on 2005-6-13*/ )3'/g`c
package com.adt.bo; ["MF-tQ5
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import java.util.List; .9lx@6]+
]#j]yGV
import org.flyware.util.page.Page; Rw^4S@~T
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/** `-]*Qb+
* @author Joa f@[q# }6
*/ ]*%0CDY6`N
publicclass Result { wcsUb9(
#
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private Page page; Ls5|4%+&
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private List content; -zN*2T
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/** $khWu>b
* The default constructor oq^#mJL
*/ /XS}<!)%
public Result(){ P3on4c
super(); Rl.3p<sX
} SEIGs_^'\
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/** jGb+bN5U7
* The constructor using fields qI^6}PB
* .N5}JUj
* @param page 5``/exG>
* @param content ,Tvk&<!0
*/ lyF~E
public Result(Page page, List content){ DN;g2R`f
this.page = page; f lR6^6E
this.content = content; <^
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} la</IpC
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/** n0>#?ek12
* @return Returns the content. &}OaiTzEmc
*/ )f*&}SV
publicList getContent(){ $*H_0w Qc
return content; pLDseEr<
} ht!o_0{~
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/** vCFMO3
* @return Returns the page. ^UEI`_HO0
*/ 7xO
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public Page getPage(){ P"XF|*^U
return page; QuT8(s1Q!
} % E3
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/** t*NZ@)>
* @param content w;&J._J
* The content to set. }NMA($@A
*/ DJS0;!#
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public void setContent(List content){ ;Lu%v%BM
this.content = content; [_G_Wl'#8
} pBL,kqYNA>
-ce N}Cb3
/** .Quu_S_vH
* @param page g`d5OHvOo
* The page to set. ;
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*/ 0x4Xs
publicvoid setPage(Page page){ K``MS
this.page = page; )U`6` &F
} \5_+6
} 3 i Id>
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Dwj!B;AZ_
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2. 编写业务逻辑接口,并实现它(UserManager, kl?U2A.=
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UserManagerImpl) f<=<:+
java代码: S*Qip,u
A0m
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/*Created on 2005-7-15*/ ONH!ms(kb
package com.adt.service; [ %cW ?@
s{(aW5$!s
import net.sf.hibernate.HibernateException; f-F+Y`P
3=RV Jb
import org.flyware.util.page.Page; =ps3=D
9.{u2a\
import com.adt.bo.Result; 9E'fM
e=<knKc
Q
/** GPONCL8(0
* @author Joa %YkJA:
*/ {pH{SRM)B
publicinterface UserManager { B8F.}M-!
t3|If@T
public Result listUser(Page page)throws
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`O?Kftv*
HibernateException; V7U&8UPb
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} cY8XA6
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java代码: ##+|zka!U
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8n+&tBq1
/*Created on 2005-7-15*/ \3JZ=/
package com.adt.service.impl; &_Z