Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Bw_Ih|y,w
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 i;xg[e8.
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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 ^m+W
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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 3FXMM&w
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分页支持类: BphF+'CM
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java代码: OeAPBhTmFj
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package com.javaeye.common.util; }cPV_^{
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import java.util.List; ?+|tPjg$
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publicclass PaginationSupport { 0ay!tS
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publicfinalstaticint PAGESIZE = 30; Z|/):nVP7
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privateint pageSize = PAGESIZE; &.z/dFmG
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privateList items; A;|DQR()
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privateint totalCount; 'pe0Q-
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privateint[] indexes = newint[0]; <+b:
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privateint startIndex = 0; rx;U/)~#<
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public PaginationSupport(List items, int @s@
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totalCount){ \1MDCP9:
setPageSize(PAGESIZE); +,-rb
setTotalCount(totalCount); dXDD/8E
setItems(items); <R(2 9QN
setStartIndex(0); (s3%1OC[
} BdKtpje
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public PaginationSupport(List items, int wMUnZHd{|
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totalCount, int startIndex){ ^0&] .m
setPageSize(PAGESIZE); C49
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setTotalCount(totalCount); sXa8(xc
setItems(items); 64vSJx>u
setStartIndex(startIndex); [>:gwl
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} 8$vH&HdI
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public PaginationSupport(List items, int H<xC%/8
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totalCount, int pageSize, int startIndex){ <^\r9Qxl
setPageSize(pageSize); \nHlI=!P
setTotalCount(totalCount); :A'!u r=\
setItems(items); <S}qcjG
setStartIndex(startIndex); kW~F*
} ?c2TT
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publicList getItems(){ FSmi.7
return items; Za6oYM_z
} Hj\~sR$L-
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publicvoid setItems(List items){ ,$]q2aL
this.items = items; N 93E;B
} =c,gK8C
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publicint getPageSize(){ nAg(lNOWN
return pageSize; zoJ;5a.3B
} UIl_&|
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publicvoid setPageSize(int pageSize){ [:QMnJ
this.pageSize = pageSize; (*RybKoaA
} l(5-Cr
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publicint getTotalCount(){ e%U*~{m+
return totalCount; .vv*bx
} 8j'*IRj*q
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publicvoid setTotalCount(int totalCount){ vdm?d/0(^
if(totalCount > 0){ wB)+og-^1f
this.totalCount = totalCount; is(!_Iv
int count = totalCount / \uk #pL
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pageSize; W~%~^2g ;k
if(totalCount % pageSize > 0) 5u46Vl{
count++; qX(%Wn;n
indexes = newint[count]; o
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for(int i = 0; i < count; i++){ aAri
indexes = pageSize * "Y!dn|3
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i;
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} AD\<}/3U
}else{ L:M9|/
this.totalCount = 0; .A\ \v6@
} xp&!Cl>C3\
} S=}~I
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publicint[] getIndexes(){ DQ\&5ytP
return indexes; yj~"C$s
} EaD@clJS
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publicvoid setIndexes(int[] indexes){ EKPTDKut
this.indexes = indexes; ;J(,F:N
} rcZ SC3
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publicint getStartIndex(){ jw[BtRW
return startIndex; XKX,7
} 4Aew
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publicvoid setStartIndex(int startIndex){ Qcy`O
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if(totalCount <= 0) 38rZ`O*D
this.startIndex = 0; 5|CiwQg|,p
elseif(startIndex >= totalCount) 3\n{,Q
this.startIndex = indexes 1fFb7n~3
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[indexes.length - 1]; ,-3(^d\1F
elseif(startIndex < 0) yCIgxPv|7
this.startIndex = 0; <j\;>3Q
else{ .4<U*Xkt
this.startIndex = indexes WrNgV@P
5%+}rSn7
[startIndex / pageSize]; 1=Zw=ufqV
} \Byk`}
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} ?=!XhU
.
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publicint getNextIndex(){ RQCQGa^cP
int nextIndex = getStartIndex() + V;-.38py
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pageSize; _IV@^v
if(nextIndex >= totalCount) )v=G}j^
return getStartIndex(); cXcx_-
else (VaN\+I:T
return nextIndex; RVnyl`s
} h+3Z.WKhwP
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publicint getPreviousIndex(){ Ig3(|{R
int previousIndex = getStartIndex() - g]<Z]R`
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pageSize; )H9*NB8%
if(previousIndex < 0) (oitCIV
return0; G>,nZ/,A{
else %lJiM`a
return previousIndex; 6
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} NWHH.1|
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} tOg
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抽象业务类 9G&l qfX:
java代码: y3nm!tjyM
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/** |SP.S 0.y
* Created on 2005-7-12 tnF9Vj[#%_
*/ mvA xx`jc
package com.javaeye.common.business; *:T>~ilF
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import java.io.Serializable; cL)rjty2
import java.util.List; c =N]!
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import org.hibernate.Criteria; @=0r3
import org.hibernate.HibernateException; V2s}<uG
import org.hibernate.Session; Pkx(M E
import org.hibernate.criterion.DetachedCriteria; 2 Z`$
import org.hibernate.criterion.Projections; Uaj`
import +B q}>
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org.springframework.orm.hibernate3.HibernateCallback; R_Gq8t$
import !+A"Lej
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org.springframework.orm.hibernate3.support.HibernateDaoS S`c]Fc
{#*? S>DA
upport; "26B4*
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import com.javaeye.common.util.PaginationSupport; sL7`=a.&T
BY4 R@)
public abstract class AbstractManager extends 5'kTe=
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HibernateDaoSupport { A-7wkZ.H
*%N7QyO`I
privateboolean cacheQueries = false; o;VkoYV
*2Vp4
privateString queryCacheRegion; &Ev]x2YC
kh?#={]Z
publicvoid setCacheQueries(boolean ui56<gI-
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cacheQueries){ 1&% d
this.cacheQueries = cacheQueries; Y!a+#N!
}
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publicvoid setQueryCacheRegion(String q3x;_y^
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queryCacheRegion){ XJJ[F|k~
this.queryCacheRegion = V"7<[u]K|
< R|)5/9
queryCacheRegion; GIC"-l1\
} 2-6.r_
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publicvoid save(finalObject entity){ 7/&C;"
getHibernateTemplate().save(entity); *H%0Gsk
} 6>=-/)p}
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publicvoid persist(finalObject entity){ T^'*_*m
getHibernateTemplate().save(entity);
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} miG;]-"^
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publicvoid update(finalObject entity){ \Z\IK
getHibernateTemplate().update(entity); Uin k
} ?v"K1C1.
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publicvoid delete(finalObject entity){
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getHibernateTemplate().delete(entity); aT?p>
} y /X:=d6"
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publicObject load(finalClass entity, Iuu<2#gb8"
q'%[[<
finalSerializable id){ .Y u<%
return getHibernateTemplate().load _Sly7_
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(entity, id); 5U-p'c9IC
} >J^7}J
*`+<x
publicObject get(finalClass entity, ;!l*7}5X=
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finalSerializable id){ vz;7} Zj]
return getHibernateTemplate().get A*\o
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(entity, id); 79{.O`v
} MPKpS3VS
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publicList findAll(finalClass entity){ 1N!Oslum
return getHibernateTemplate().find("from 4; BW
er["NSo
" + entity.getName()); u [V4OU}%
} fqcU5l[v,
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publicList findByNamedQuery(finalString .N5hV3
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namedQuery){ uQ[vgNe*m
return getHibernateTemplate ,zAK3d&hj
bU;}!iVc]
().findByNamedQuery(namedQuery); Mvy6"Q:
} +=ZWau
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publicList findByNamedQuery(finalString query, -Q<z1vz
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finalObject parameter){ 0Y5LDP
return getHibernateTemplate v%H"_T
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().findByNamedQuery(query, parameter); vF9*tK'
} <O \tC81
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publicList findByNamedQuery(finalString query, =7 Jy
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finalObject[] parameters){ V*6l6-y~Ih
return getHibernateTemplate l;XU#6{
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().findByNamedQuery(query, parameters); 42b. 7E
} m0=cMVCA!
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publicList find(finalString query){ 2wB.S_4"-<
return getHibernateTemplate().find Mam8\
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(query); vC{h2A
} \ V[;t-
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publicList find(finalString query, finalObject p&i.)/
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parameter){ %==G+S{
return getHibernateTemplate().find N7e`6d!
<\ y!3;
(query, parameter); k0H?9Z4k5
} NFB*1_m
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public PaginationSupport findPageByCriteria b->eg 8|
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(final DetachedCriteria detachedCriteria){ ooTc/QEYi
return findPageByCriteria #,@bxsB
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 6yE'/VB<
} ;$vLq&(}
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public PaginationSupport findPageByCriteria xU@1!%l@
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(final DetachedCriteria detachedCriteria, finalint 4cott^K.
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startIndex){ DW1@<X
return findPageByCriteria <(fdHQD!7>
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(detachedCriteria, PaginationSupport.PAGESIZE, Wu4ot0SZ
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startIndex); 6XdWm
} MMMqG`Px
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public PaginationSupport findPageByCriteria r)gCTV(kb
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(final DetachedCriteria detachedCriteria, finalint 2Oyy`k
@'*eC}\E
pageSize, 'z)hG#{I
finalint startIndex){ [-4KY4R
return(PaginationSupport) :%N*{uy
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getHibernateTemplate().execute(new HibernateCallback(){ y|^EGnaE
publicObject doInHibernate ):3MYSqX
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(Session session)throws HibernateException { v9u<F6
Criteria criteria = ERF,tLa!
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detachedCriteria.getExecutableCriteria(session); ar Q)%W
int totalCount = %Nj #0YF]
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((Integer) criteria.setProjection(Projections.rowCount N*Yy&[
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()).uniqueResult()).intValue(); $K})Q3FNi
criteria.setProjection d]8_l1O
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(null); yk<VlS
List items = Mal <iNN
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criteria.setFirstResult(startIndex).setMaxResults ,I ZqLA
"lTZ|k^
(pageSize).list(); 'qjX$]H
PaginationSupport ps = W]_g4,T>
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new PaginationSupport(items, totalCount, pageSize, _m Xs4
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startIndex); lK*jhW?3:
return ps; fmFzW*,E
} S.: 7k9
}, true); \^9pW 2v
} EJ`Q8uz
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public List findAllByCriteria(final s
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DetachedCriteria detachedCriteria){ q]TqI' o
return(List) getHibernateTemplate bw9
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().execute(new HibernateCallback(){ vs+QbI6>-
publicObject doInHibernate -j&Vtr
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(Session session)throws HibernateException { gXt O*Rfqk
Criteria criteria = TiyUr [
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detachedCriteria.getExecutableCriteria(session);
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return criteria.list(); 9*\g`fWc}{
} 0oSQY[ht/
}, true); p>q&&;fe
} n3$gx,KL
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public int getCountByCriteria(final P`EgA
#-{N
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DetachedCriteria detachedCriteria){ [(ygisqt
Integer count = (Integer) L+.H z&*@
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getHibernateTemplate().execute(new HibernateCallback(){ &RW`W)0;
publicObject doInHibernate B`{mdjMy
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(Session session)throws HibernateException { u]E.iXp
Criteria criteria = |@RpWp>2
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detachedCriteria.getExecutableCriteria(session); T@P!L
return vk'rA{x
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criteria.setProjection(Projections.rowCount ^=+e?F`:{
a9l8{3
()).uniqueResult(); ^m%52Tm
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} w"8V0z
}, true); ~}Z'0W)Q`z
return count.intValue(); :,
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} &94W-zh
} ?3q@f\fZ
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用户在web层构造查询条件detachedCriteria,和可选的 kRlA4h1u_$
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 3-|3`(
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PaginationSupport的实例ps。 "^Rv#
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ps.getItems()得到已分页好的结果集 OlY$v@|
ps.getIndexes()得到分页索引的数组 iZxt/}1X0
ps.getTotalCount()得到总结果数 exZLj0kvF
ps.getStartIndex()当前分页索引 rN5tI.iC
ps.getNextIndex()下一页索引 BBnq_w"a
ps.getPreviousIndex()上一页索引 7-*=|gl+
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 cb$-6ZE/
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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 fS=hpL6]@
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一下代码重构了。 JOD/Raq.1k
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我把原本我的做法也提供出来供大家讨论吧: E[g*O5
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首先,为了实现分页查询,我封装了一个Page类: 38IMxd9v
java代码: &<]<a_pw
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/*Created on 2005-4-14*/ 2k5/SV
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package org.flyware.util.page; $yu?.b
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ub K7B |p
/** ,6,]#R
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* @author Joa (sTuG}
*
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*/ T
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publicclass Page { 1^G{tlA-
ynwG\V
/** imply if the page has previous page */ rs;r
$
privateboolean hasPrePage; P_Hv%g
#hw>tA6
/** imply if the page has next page */ _[h8P9YI4
privateboolean hasNextPage; >:1P/U
szmmu*F,U:
/** the number of every page */ dl~|Izm
privateint everyPage; se9>.}zZN
Log|%P\
/** the total page number */ w_wslN,)
privateint totalPage; iG<Som
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/** the number of current page */ W+=o&V
privateint currentPage; *d*,Hqn
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/** the begin index of the records by the current ]$b2a&r9
@It>*B yB.
query */ #,NvO!j<4
privateint beginIndex; z=Cr7-
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/** The default constructor */ vbG]mMJ
public Page(){ |j~lkzPnV
B.dT)@Lx0
} 1;F`c`0<
vVxD!EL
/** construct the page by everyPage I]`-|Q E
* @param everyPage gVR@&bi7
* */ mY7>(M{
public Page(int everyPage){ qxOi>v0\H
this.everyPage = everyPage; [1yq{n=
} 0JjUAxNq
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/** The whole constructor */ PoSpkJH
public Page(boolean hasPrePage, boolean hasNextPage, a;AzY'R
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int everyPage, int totalPage, }^kL|qmjR
int currentPage, int beginIndex){ yd_
(?V&;_
this.hasPrePage = hasPrePage; vX|UgK?2^
this.hasNextPage = hasNextPage; #]Y>KX2HG
this.everyPage = everyPage; r' Z3
this.totalPage = totalPage; /RnTQ4
this.currentPage = currentPage; X6e/g{S)
this.beginIndex = beginIndex; }hpmO-
} |a^U]
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/** f58?5(Dc|
* @return 4,p;Km&
* Returns the beginIndex. V ~{fB~
*/ DGESba\2+
publicint getBeginIndex(){ ;q>9W,jy
return beginIndex; )?! [}t
} %kshQ%P)?
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/** f9$xk|2g
* @param beginIndex !~i'
-4]
* The beginIndex to set. 3>M&D20Z
*/ )FN;+"IJ
publicvoid setBeginIndex(int beginIndex){ I^\&y(LJF
this.beginIndex = beginIndex; *XOJnyC_H
} &EGqgNl
q'[}9e`Q
/** w*9br SK
* @return 26?W
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* Returns the currentPage. 5*%#o
*/ "UFs~S|e
publicint getCurrentPage(){ 0pb'\lA
return currentPage; m7c*)"^
} -_OS%ARa
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/** 5Z/7kU=I
* @param currentPage J5Z%ImiT^O
* The currentPage to set. ^ <`(lyph
*/ Jb_1LZ)]
publicvoid setCurrentPage(int currentPage){ `O?T.p)
this.currentPage = currentPage; @&F@I3`{
} -7H^n#]
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/** ?tdd3ai>
* @return BimjQ;jtI
* Returns the everyPage. B<?[Mrdxw
*/ e!-,PU9+
publicint getEveryPage(){ 6Q&r0>^{
return everyPage; WS8+7O'1\
} r;>+)**@vl
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/** BAj-akc f
* @param everyPage k,F"-K+M
* The everyPage to set. ^[E'1$D
*/ Ox!U8g8c
publicvoid setEveryPage(int everyPage){ lH^^77"4Qo
this.everyPage = everyPage; %.v{N6
} DhLqhME53
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/** N{SQ(%V
* @return ^$>XW\yCs
* Returns the hasNextPage. ~[o4a '
*/ Qp,DL@mp>8
publicboolean getHasNextPage(){ `N//A}9
return hasNextPage; ]Y>h3T~
} U6ZR->:
mbRqJT>@
/** !rDdd%Z
* @param hasNextPage D%mXA70
* The hasNextPage to set. W1Lr_z6
*/ tY${M^^<J
publicvoid setHasNextPage(boolean hasNextPage){ vr^~yEr
this.hasNextPage = hasNextPage; 5<pftTcZ
} ,C.:;Ime({
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/** AE`We$!
* @return X[s8X!#
* Returns the hasPrePage. ]?1Y
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*/ Snly UP~P
publicboolean getHasPrePage(){ Pz#7h*;cw.
return hasPrePage; qSqI7ptA\
} keW~ NM
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/** c3*t_!@oC
* @param hasPrePage SKuIF*"!S
* The hasPrePage to set. )0vU
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*/ EFuvp8^y
publicvoid setHasPrePage(boolean hasPrePage){ W!blAkM%i
this.hasPrePage = hasPrePage; mME4 l
} n~V4nj&_T
B_U{ s\VY
/** FsB^CxVg
* @return Returns the totalPage. ,t{,_uPJY
* s5.AW8X=?*
*/ _I`,Br:N
publicint getTotalPage(){ P7ph}mB
return totalPage; etT +
} H.<a`mm8
+;g{$da5
/** JjpRHw8\
* @param totalPage n%R;-?*v
* The totalPage to set. FlfI9mm
*/ zl-2$}<a
publicvoid setTotalPage(int totalPage){ V@7KsB
this.totalPage = totalPage; K3uG2g(>2
} oRKEJNps
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} J89Dul l
n?\ nn3
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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 (>6*#9#p
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个PageUtil,负责对Page对象进行构造: {e|*01hE
java代码: .6O"|
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/*Created on 2005-4-14*/ W"{v2x i
package org.flyware.util.page;
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import org.apache.commons.logging.Log; wxm:7$4C
import org.apache.commons.logging.LogFactory; 6Ao%>;e*
LA_3=@2.H
/** n .!Ym
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* @author Joa O3N0YGhJ
* I$Qs;- (
*/ 5qg2Zc~
publicclass PageUtil { <9=9b_z
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privatestaticfinal Log logger = LogFactory.getLog /&u<TJ4
N=:5eAza
(PageUtil.class); Wv__ wZ
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/** %}86D[PF
* Use the origin page to create a new page M
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* @param page ]
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* @param totalRecords $F.([?)k?
* @return ELh8ltLY
*/ -",=G\XZ
publicstatic Page createPage(Page page, int y%sroI('y
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totalRecords){ LG~S8u
return createPage(page.getEveryPage(), JKer//ng4
!R*-R.%
page.getCurrentPage(), totalRecords); Q^p|Ldj
} h/x0]@M&
@i^~0A#q*
/** p^(&qk?ut
* the basic page utils not including exception Hk>79};
v7%X@j]ji
handler t9&cE:n
* @param everyPage `cx]e
* @param currentPage $?,a[79
* @param totalRecords Tirux ;
* @return page /h v4x9
*/ k3+e;[My+
publicstatic Page createPage(int everyPage, int >7!6nF3x,
tb:L\A^:
currentPage, int totalRecords){ %Pksv}
everyPage = getEveryPage(everyPage); }M1sksk5
currentPage = getCurrentPage(currentPage); ZEYgK)^
int beginIndex = getBeginIndex(everyPage, |F.)zC5{
7?B.0>$3>V
currentPage); ,!V]jP)
int totalPage = getTotalPage(everyPage, @&D?e:|!U
;> m"x
totalRecords); X1ZgSs+i
boolean hasNextPage = hasNextPage(currentPage, vP7K9Kx
GDYFU*0
totalPage); 9%*wb`&
boolean hasPrePage = hasPrePage(currentPage); jBaB@LO9G
:'aAZegQY
returnnew Page(hasPrePage, hasNextPage, 3E
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everyPage, totalPage, /-6S{hl9Ne
currentPage, 8/z3=O&
SuZ&vqS
beginIndex); Z):n c% S
} R3k1RE2c&g
kNu'AT#3|
privatestaticint getEveryPage(int everyPage){ OD Ur
return everyPage == 0 ? 10 : everyPage; "EU{8b
} .I}:m%zv
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privatestaticint getCurrentPage(int currentPage){ ogFKUD*h&>
return currentPage == 0 ? 1 : currentPage; z} '! eCl
} 8q`$y$06Dk
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privatestaticint getBeginIndex(int everyPage, int aA-
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currentPage){ DF6c|
return(currentPage - 1) * everyPage; mAk{"65V
} ;,&8QcSVY
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privatestaticint getTotalPage(int everyPage, int MxzLK%am
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totalRecords){ 7u\*_mrv
int totalPage = 0; lyCW=nc
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if(totalRecords % everyPage == 0) 0?WcoPU
totalPage = totalRecords / everyPage; k`".
else 8Ry74|`=R
totalPage = totalRecords / everyPage + 1 ;
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return totalPage; "l={)=R
} vaf&X]p
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privatestaticboolean hasPrePage(int currentPage){ 1>Q{Gs^
return currentPage == 1 ? false : true; b]E|*
} ?)'~~@NkH
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privatestaticboolean hasNextPage(int currentPage, B7\k< Nit0
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int totalPage){ ?Z\Yu'
return currentPage == totalPage || totalPage == 2!N8rHRt
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0 ? false : true; z9W`FBg
} (BX83)
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} %hlspI(J
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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。 \b}~2oX
MH|]\
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 #6Xs.*b5C
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做法如下: >-E<