Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 vs|>U-Mpw~
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 28M!G~|
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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 V|vU17Cgy
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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 DJlY~}v#_
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。
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分页支持类: : g/H N9
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java代码: mPGF Y
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package com.javaeye.common.util; A(#hyb#
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import java.util.List; @)iv'
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publicclass PaginationSupport { :NHh`@0F
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publicfinalstaticint PAGESIZE = 30; MId\dFu
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privateint pageSize = PAGESIZE; xmZ]mu,,$
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privateList items; ]>K%,}PS
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privateint totalCount; LjjE(Yrv{
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privateint[] indexes = newint[0]; *""'v
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privateint startIndex = 0; X""<5s'0
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public PaginationSupport(List items, int *iS<]y
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totalCount){ N. 3
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setPageSize(PAGESIZE); z (r Q6
setTotalCount(totalCount); nm66U4.@
setItems(items); }NDw3{zn
setStartIndex(0); |_ HH[s*U
} lKEdpF<
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public PaginationSupport(List items, int 5#+!|S[PK
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totalCount, int startIndex){ zzy%dc
setPageSize(PAGESIZE); H-?SlVsf
setTotalCount(totalCount); MT BN&4[
setItems(items); ?G+v#?A
setStartIndex(startIndex); T>d-f=(9KH
} $I!vQbi
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public PaginationSupport(List items, int ~P|YAaFx
#sy)-xM
totalCount, int pageSize, int startIndex){ E>xdJ
setPageSize(pageSize); @rkNx@[~
setTotalCount(totalCount); Q$G!-y+"i
setItems(items); MzsDWx;eJ
setStartIndex(startIndex); ge?1ez2
} ]~CGzV
@v_ ) (
publicList getItems(){ draY/
return items; 2 @Jw?+}vr
} |#$Wh+,*
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publicvoid setItems(List items){ D_D<N(O
this.items = items; X'e@(I!0
} $d%m%SZxv
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publicint getPageSize(){ Q/r9r*>z
return pageSize; bl(rCbj(w
} V[Fzh\2n
ZffK];D
publicvoid setPageSize(int pageSize){ 4&~1|B{Z
this.pageSize = pageSize; CHv~H.kh'
} z#GZvB/z)
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publicint getTotalCount(){ =9 FY;9
return totalCount; [F%INl-sy
} vL{sk|2&
X*1vIs;[@
publicvoid setTotalCount(int totalCount){ G%-[vk#]
if(totalCount > 0){ Ki{&,:@
this.totalCount = totalCount; Uaog_@2n,
int count = totalCount / 2#ND(
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pageSize; 2ksX6M3kY
if(totalCount % pageSize > 0) mu04TPj
count++; ]wWN~G)2lV
indexes = newint[count]; `omZ'n)
for(int i = 0; i < count; i++){ *xA&t)z(i
indexes = pageSize * R
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i; ZJ'#XZpr
} Eic/#j{4
}else{ i]a0
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this.totalCount = 0; kJq8"Klg
} L;H(I@p(e
} }Zc.rk
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publicint[] getIndexes(){ [>Z~&cm
return indexes; A#RA;Dt:
} 'J#u;KJ
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publicvoid setIndexes(int[] indexes){ lNowH0K!D
this.indexes = indexes; z{Z'2 ,#
} 4*d$o=wa
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publicint getStartIndex(){ yNi/JM
return startIndex; p)RASIB
} \-$wY%7
T?{"T/
publicvoid setStartIndex(int startIndex){ 5ycccMx0V
if(totalCount <= 0) \"{+J
this.startIndex = 0; d4t%/ Uh
elseif(startIndex >= totalCount) }p$>V,u
this.startIndex = indexes 0#0[E ,
L,M=ogdb
[indexes.length - 1]; XCCN6[[+
elseif(startIndex < 0) I9rWut@+
this.startIndex = 0; wO/}4>\
else{ URdCV{@42
this.startIndex = indexes W2P(!q>r]
cm@q{(r
[startIndex / pageSize]; ?%dsY\
} ET;YAa*
} Xd@ -
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publicint getNextIndex(){ b1JXC=*@
int nextIndex = getStartIndex() + 1p=^I'#
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pageSize; {.qeVE{
if(nextIndex >= totalCount) 5P-7"g ca
return getStartIndex(); fmrd 7*MW
else ?j9J6=2
return nextIndex; '!^5GSP3&
} ~VYZu=p
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publicint getPreviousIndex(){ {z>fe
}
int previousIndex = getStartIndex() - ad1 I2
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pageSize; :6~Nq/hZB
if(previousIndex < 0) I },.U&r
return0; $_ IvzbOh
else 89o&KF]
return previousIndex; i#]}k
} &~)PB
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} kk#%x#L[
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抽象业务类 ZFwUau
java代码: CC&o pC
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/** k8IhQ{@
* Created on 2005-7-12 sh;DCd
*/ 1c8Nr&Jl
package com.javaeye.common.business; E#}OIZ\S
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import java.io.Serializable; nX%b@cOXj
import java.util.List; =f0qih5.4
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import org.hibernate.Criteria; ehCGu(=
import org.hibernate.HibernateException; )N$T&
import org.hibernate.Session; xe?!UCUb@
import org.hibernate.criterion.DetachedCriteria; VF[$hs
import org.hibernate.criterion.Projections; G#yv$LY#
import !jlLF:v|1A
%PA#x36
org.springframework.orm.hibernate3.HibernateCallback; l@:Tw.+/9
import E$l 4v>iA
-wn,7;
org.springframework.orm.hibernate3.support.HibernateDaoS ^f6pw!
ov;1=M~RF
upport; "?9rJx$
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import com.javaeye.common.util.PaginationSupport; `%S 35x9
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public abstract class AbstractManager extends fghw\\]3
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HibernateDaoSupport { g{PEplk
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privateboolean cacheQueries = false; |)~t^
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privateString queryCacheRegion; k7,
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publicvoid setCacheQueries(boolean w{F{7X$^
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cacheQueries){ u%m,yPU~B
this.cacheQueries = cacheQueries; RfoEHN
} j-]`;&L
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publicvoid setQueryCacheRegion(String h;TN$ /
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queryCacheRegion){ )LC"rSNx%
this.queryCacheRegion = /=5:@
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queryCacheRegion; |WP}y-Au
} $'*q]]
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publicvoid save(finalObject entity){ f4'WT
getHibernateTemplate().save(entity); &|9K~#LVS
} e|-&h `[
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publicvoid persist(finalObject entity){ Nyx)&T&I
getHibernateTemplate().save(entity); *jQ?(Tf
} (>.lkR
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publicvoid update(finalObject entity){ x-nO; L-2p
getHibernateTemplate().update(entity); ^cDHC^Wm
} j_3`J8WwF
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publicvoid delete(finalObject entity){ WUBI(g\
getHibernateTemplate().delete(entity); :+ZLKm
} 8
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publicObject load(finalClass entity, NHaY&\
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finalSerializable id){ T
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return getHibernateTemplate().load `!( IQ&
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(entity, id); MCO2(E-
} ,ZV>"'I:
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publicObject get(finalClass entity, AZ.$g?3w
WAt= T3
finalSerializable id){ -I?8\
return getHibernateTemplate().get I+{2DY/}
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(entity, id); dtj+ avG
} {8* d{0l
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publicList findAll(finalClass entity){ gNHS:k\"
return getHibernateTemplate().find("from @}\i`H1s
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" + entity.getName()); ;Zm-B]\
} ~pT1,1
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publicList findByNamedQuery(finalString Xj9\:M-
a[_IG-l|i4
namedQuery){ X5pb9zRq
return getHibernateTemplate uG$*DeZti
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().findByNamedQuery(namedQuery); $\+x7"pI
} + 70x0z2
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publicList findByNamedQuery(finalString query, Xf#+^cQ
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finalObject parameter){ 9.%t9RM^
return getHibernateTemplate 1}_4C0h\'
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().findByNamedQuery(query, parameter); UgLFU#
} A.vf)hO
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publicList findByNamedQuery(finalString query, QWc,JCu
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finalObject[] parameters){ _\8jnpT:
return getHibernateTemplate [l/!&6
#w3J+U 6r
().findByNamedQuery(query, parameters); < 1%}8t"
} ",xTgB3?V
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publicList find(finalString query){ k!ID
return getHibernateTemplate().find oJZxRm[g$t
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(query); : *XAQb0
} RFLfvD<
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publicList find(finalString query, finalObject -=cm7/X
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parameter){ "F =NDF
return getHibernateTemplate().find q9wObOS$
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(query, parameter); boI&q>-6Re
} DaQ+XUH?
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public PaginationSupport findPageByCriteria 0l3[?YtXc
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(final DetachedCriteria detachedCriteria){ Xj{gyLs
return findPageByCriteria 1eywnOjrj
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); BhYvEbt
} $%^](-
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public PaginationSupport findPageByCriteria nE +H)%p
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"
(final DetachedCriteria detachedCriteria, finalint Wco2i m
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startIndex){ gW<6dP'v
return findPageByCriteria otdRz<C
z4 <_>)p
(detachedCriteria, PaginationSupport.PAGESIZE, Oi'y0S~g
R7"7
Rx
startIndex); Ab]tLz|Z
} 2i0;b|-=
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public PaginationSupport findPageByCriteria "F}dZ
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(final DetachedCriteria detachedCriteria, finalint q 'd]
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pageSize, |{Ex)hkw
finalint startIndex){ x|yJCs>
return(PaginationSupport) EjFn\|VK
",&QO7_
getHibernateTemplate().execute(new HibernateCallback(){ F b?^+V]9
publicObject doInHibernate (3K3)0fy
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(Session session)throws HibernateException { t=X=",)f
Criteria criteria = HE35QH@/`
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detachedCriteria.getExecutableCriteria(session); }AA">FF'y4
int totalCount = %*szB$[3
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((Integer) criteria.setProjection(Projections.rowCount 8{=|<
OPzudO
()).uniqueResult()).intValue(); 4D2U,Ds
criteria.setProjection OX 'V
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(null); 4BUG\~eI3
List items = ?Wz2J3A.2t
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criteria.setFirstResult(startIndex).setMaxResults (c)=Do=
4b[bj").A
(pageSize).list(); %L^( eTi[
PaginationSupport ps = h]h"-3
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new PaginationSupport(items, totalCount, pageSize, Wlxmp['Bh
@I-,5F|r
startIndex); $m)gfI]9
return ps; [.^ol6
} &9^4-5]
}, true);
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} @"`}%-b
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public List findAllByCriteria(final ?$K-f:?c
V]; i$
DetachedCriteria detachedCriteria){ }2@Z{5sh)
return(List) getHibernateTemplate |,@D<
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().execute(new HibernateCallback(){ E&
.^|<n
publicObject doInHibernate &BLCP d
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(Session session)throws HibernateException { y~\ujp_5w
Criteria criteria = qF4tjza;k
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detachedCriteria.getExecutableCriteria(session); W03mdRW
return criteria.list(); 1$eoW/8.
} F$DA/ {.D
}, true); 4VZI]3K,
} ,+
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public int getCountByCriteria(final g3c<c S^l
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DetachedCriteria detachedCriteria){ @]%eL
Integer count = (Integer) triU^uvh
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getHibernateTemplate().execute(new HibernateCallback(){ OA*O =
publicObject doInHibernate cFw-JM<
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(Session session)throws HibernateException { ,\J 8(,%L
Criteria criteria = <wk
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detachedCriteria.getExecutableCriteria(session); ru@#s2
return PkrVQH9^w
9:4S[mz/hD
criteria.setProjection(Projections.rowCount w.w{L=p:<"
x)*Lu">
()).uniqueResult(); 72d|Jbd
} &RYdSXM
}, true); V\Gs&>
return count.intValue(); @JXpD8jn
} z'm}p
} UP^8Yhdo
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用户在web层构造查询条件detachedCriteria,和可选的 /Ne#{*z)hO
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 h40;Q<D
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PaginationSupport的实例ps。 .p!
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ps.getItems()得到已分页好的结果集 p/-du^:2
ps.getIndexes()得到分页索引的数组 *rmC3'}s
ps.getTotalCount()得到总结果数 ?4%H(k5A
ps.getStartIndex()当前分页索引 [(@K;6o
ps.getNextIndex()下一页索引 -y-}g[`
ps.getPreviousIndex()上一页索引 3A!a7]fW
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 y017
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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 &N^~=y^`C'
3_)I&RM
一下代码重构了。 oj djy#:
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我把原本我的做法也提供出来供大家讨论吧: m"9f(
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首先,为了实现分页查询,我封装了一个Page类: $_"u2"p
java代码: t`z "=S
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/*Created on 2005-4-14*/ =$J(]KPv!?
package org.flyware.util.page; 4CF;>b
f~
d <}'eBT'
/** kM506U<g
* @author Joa TI DgIK
* vW=-RTRH
*/ Qp:I[:Lr;
publicclass Page { xn3 _ED
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/** imply if the page has previous page */ )$:1e)d
privateboolean hasPrePage; eLSzGbKf
Ma|4nLC}
/** imply if the page has next page */ $(9QnH1KY
privateboolean hasNextPage; .2fvRN92
7<xnE]jdq
/** the number of every page */ }qiZ%cT.G
privateint everyPage; %XGm\p
5)RZJrN]
/** the total page number */ !d N[9}
privateint totalPage; mLuNl^)3
=sYILe[
/** the number of current page */ U*[E+Uq}:N
privateint currentPage; l1 Kv`v\
0$)Q@#
/** the begin index of the records by the current v8ap"9b
lD,2])>
query */ J 6KHc^,7
privateint beginIndex; *DPX4P
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7.h{"xOx{
/** The default constructor */ 2%pED
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public Page(){ '0D$C},^|8
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} J{ju3jo
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/** construct the page by everyPage W'@|ob
* @param everyPage M-^I! C
* */ bp?5GU&Uy
public Page(int everyPage){ ln82pQD2Y~
this.everyPage = everyPage; EH|+S
} <c}@lj-j
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/** The whole constructor */ N[/<xW~x?4
public Page(boolean hasPrePage, boolean hasNextPage, pt<zyH3Z
&zJI~R
P1mg;!tq
int everyPage, int totalPage, >1sa*Wf
int currentPage, int beginIndex){ jo:Z
this.hasPrePage = hasPrePage; W"Ip]LJ
this.hasNextPage = hasNextPage; >38>R0k35
this.everyPage = everyPage; |R9Lben',
this.totalPage = totalPage; L0g+RohW
this.currentPage = currentPage; [KK
|_
this.beginIndex = beginIndex; MLWHO$C~T
} dVb6u
}:#WjH^
/** gs'M^|e)
* @return <VxA&bb7c
* Returns the beginIndex. D^6*Cwb
*/ XG/xMz~
publicint getBeginIndex(){ Ooz,?wU6
return beginIndex; .==D?#bn
} 6iU&9Z<%
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/** [{7#IZL
* @param beginIndex _<S!tW
* The beginIndex to set. fB$a)~
*/ E`fG9:6l]
publicvoid setBeginIndex(int beginIndex){ )7
p"
-
this.beginIndex = beginIndex; =?OU^u`C
} OXQ*Xpc
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/** Ixxs(
* @return Pm/<^z%
* Returns the currentPage. xWG@<}H
*/ sq'm)g
publicint getCurrentPage(){ kOQ)QX
return currentPage; I0}.!
} ukR0E4p
XJ<"S
p
/** *$eH3nn6g
* @param currentPage O)dnr8*
* The currentPage to set. uuY^Q;^I*
*/ =<n ]T;
publicvoid setCurrentPage(int currentPage){ V+`kB3GV
this.currentPage = currentPage; gRY#pRT6d
} <<
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/** roS" q~GS,
* @return d {!P
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* Returns the everyPage. , /.@([C
*/ T~]~'+<Pi
publicint getEveryPage(){ {xTq5`&gT
return everyPage; %>
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} |*{*tW C1
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/** F1yn@a "=J
* @param everyPage );0
* The everyPage to set.
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*/ _5p$#U`
publicvoid setEveryPage(int everyPage){ `jE[Xt"@
this.everyPage = everyPage; .Pm5nS
} UXct+l
.\XRkr'-
/** ]K(a32V CH
* @return ,j%\3g`
* Returns the hasNextPage. QEJu.o
*/ oZ%uq78#[%
publicboolean getHasNextPage(){ }WsPu o
return hasNextPage; M}|(:o3Yo
} 07.p
{X R
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/** eHgr"f*7
* @param hasNextPage CF;Gy L1M
* The hasNextPage to set. {I{ 0rV
*/ wiN0|h>,
publicvoid setHasNextPage(boolean hasNextPage){ >j?5?J"
this.hasNextPage = hasNextPage; ;dzy5o3
} 5=TgOS]R
r8m}B#W7
/** a OmG, +o
* @return J*zzjtY( 1
* Returns the hasPrePage. Al
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*/ f+:iz'b#U
publicboolean getHasPrePage(){ $wM..ee
return hasPrePage; (:bf m
} 1clzDwW
\n_7+[=E
/** ='"Yj
* @param hasPrePage L0![SE>
* The hasPrePage to set. [Hx}#Kds
*/ !RKuEg4hQ
publicvoid setHasPrePage(boolean hasPrePage){ 3/RwCtc
this.hasPrePage = hasPrePage; )?jFz'<r
} 2* g2UP
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?"
/** 2O kID
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* @return Returns the totalPage. !~E/Rp
* IOFXkpKR
*/ ]xvA2!)Q
publicint getTotalPage(){ %B@NW2ZQ[
return totalPage; P`Zon
} u$JAjA
"Da1BuX\
/** T, #-: }
* @param totalPage q[Ai^79
* The totalPage to set. aqSOC(jU
*/ oRbWqN`F.
publicvoid setTotalPage(int totalPage){ od!44p]
this.totalPage = totalPage; ranem0KQ)]
} phDIUhL$z
1L<TzQ
} U4d7-&U
dC6>&@
VX
I!/EQO|
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 EeYL~ORdi
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个PageUtil,负责对Page对象进行构造: ~?NCmU=3
java代码: 8ve-g\C8 H
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/*Created on 2005-4-14*/ v J0v6\
package org.flyware.util.page; o*$KiD
S[L@8z.Sj
import org.apache.commons.logging.Log; Gm-
"?4(
import org.apache.commons.logging.LogFactory; w^L`"
pqg2#@F.
/** =)bOteWM
* @author Joa #s~ITG#H
* 7O)ATb#up
*/ }6l:'nW
publicclass PageUtil { Xf;!w:u
G:e=9qTf
privatestaticfinal Log logger = LogFactory.getLog yl>^QMmo
-,
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(PageUtil.class); Yh]a4l0
bAt!S
/** ta&z lZt
* Use the origin page to create a new page |e8A)xM]wC
* @param page (U5XB
[r_P
* @param totalRecords ZvuY]=^3
* @return 5^uX!_r`
*/ _U}|Le@ e
publicstatic Page createPage(Page page, int -F`gRAr-
.x$V~t
totalRecords){ E`N`
return createPage(page.getEveryPage(), k8E2?kbF
uhq6dhhR
page.getCurrentPage(), totalRecords); 9ZOQNN<ex
} _
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Wda?$3!^q
/** -AnJLFY
* the basic page utils not including exception ~%\vX
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handler tLJ 7tnB
* @param everyPage M]V
j
* @param currentPage @{V`g8P>
* @param totalRecords 4=q4_ \_T
* @return page ->|eMV'd
*/ ^Ip\`2^u
publicstatic Page createPage(int everyPage, int uEPm[oyX
Le~D"d8
currentPage, int totalRecords){ o< b
everyPage = getEveryPage(everyPage); djf8FNnn
currentPage = getCurrentPage(currentPage); fwtsr>SV
int beginIndex = getBeginIndex(everyPage, `mkOjsj &
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currentPage); (6[<