Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 2VNfnk
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 y[@<goT
cxQ8/0^
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 Z<0+<tt
L]HYk}oD.
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 kaj6C_k|
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分页支持类: ,o)U9<
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java代码: \LS+.bp%
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package com.javaeye.common.util; y3O Nn~k
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import java.util.List; MrA&xM
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publicclass PaginationSupport { pQY.MZSA
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publicfinalstaticint PAGESIZE = 30; sm>Hkci%
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privateint pageSize = PAGESIZE; :bA@
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privateList items; #?z1cgCg
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privateint totalCount; :oH"
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privateint[] indexes = newint[0]; k'BLos1W
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privateint startIndex = 0; ?)cNe:KY
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public PaginationSupport(List items, int { [4Y(l1
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totalCount){ imtW[ y+4
setPageSize(PAGESIZE); d*lnXzQor
setTotalCount(totalCount); 4>gMe3]0
setItems(items); 8<t?o'9I
setStartIndex(0); 15r<n
} Nky%v+r
T]nZ3EZ
public PaginationSupport(List items, int d%9r"=/
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totalCount, int startIndex){ |Js96>B:
setPageSize(PAGESIZE); PL8eM]XS
setTotalCount(totalCount); 6!i0ioZzi0
setItems(items); %xR;8IO
setStartIndex(startIndex); 3Lq?Y7#KQp
} =ot`V; Q>
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public PaginationSupport(List items, int P,O9On
KW.S)+<H&
totalCount, int pageSize, int startIndex){ s&lZxnIjc
setPageSize(pageSize); P$@5&/]
setTotalCount(totalCount); UG+wRX :dA
setItems(items); mV;Egm{A\
setStartIndex(startIndex); 4kA/W0 VG
} h"YIAQ',
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publicList getItems(){ / vge@bsE
return items; 79a{Zwdd9j
} *kxk@(lT?
6yF4%Sz9
publicvoid setItems(List items){ "_C^Bc
this.items = items; yi7-[W}
} nrA}36 E
awXL}m[_!
publicint getPageSize(){ 9h$-:y3
return pageSize; o"v>
BhpC
} $<]y.nr|CX
lE[LdmwDrb
publicvoid setPageSize(int pageSize){ HF5aU:M
this.pageSize = pageSize; RH. oo&
}
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jo<[|ZD
publicint getTotalCount(){ 9\Mesf1$o
return totalCount; FQ?H%UcW
} xN}P0
0pu])[P]_[
publicvoid setTotalCount(int totalCount){ -2tX 15,
if(totalCount > 0){ Eln"RKCt}9
this.totalCount = totalCount; {:Z# 8dGe
int count = totalCount / S]1+tj
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pageSize; 'mug,jM
if(totalCount % pageSize > 0) ,I@4)RSAH|
count++; "^<:7 _Y
indexes = newint[count]; r[M]2h
for(int i = 0; i < count; i++){ ZH`6>:
indexes = pageSize * TRAs5I%
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i; n\*>mp)
} *`);_EVc
}else{ t3Q;1#Zf
this.totalCount = 0; 9))%tYN
} !hFb<
} rP;Fh|w#
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publicint[] getIndexes(){ Y.i<7pBt
return indexes; KE16BjX@
} ; ZL<7tLDb
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publicvoid setIndexes(int[] indexes){ QKZm<lUL
this.indexes = indexes; 8+
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} bg_Zf7{
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publicint getStartIndex(){ $1\<>sJH
return startIndex; \p@,+ -gX
} ahS*YeS7
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publicvoid setStartIndex(int startIndex){ ERGDo=j
if(totalCount <= 0) YIfPE{,
this.startIndex = 0; DD|%F
elseif(startIndex >= totalCount) >}u?{_s *0
this.startIndex = indexes vo uQ.utl
.(CzsupY_q
[indexes.length - 1]; tmK@Veb*a'
elseif(startIndex < 0) 4VaUa8 D
this.startIndex = 0; WqY:XE+?\
else{ u/y`M]17
this.startIndex = indexes <s+=v!
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[startIndex / pageSize]; A~I}[O~(pb
} %r6~5_A
} ]v94U b
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publicint getNextIndex(){ !&E>8h
int nextIndex = getStartIndex() + cKF02?)TX
lUCdnp;w'
pageSize; %~^R Iwm
if(nextIndex >= totalCount) 9eGM6qW\_
return getStartIndex(); SY <!-g<1F
else IOTHk+w
return nextIndex; M29[\@zL
} 1.yw\ZC\
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publicint getPreviousIndex(){
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int previousIndex = getStartIndex() - <B$Lu4b@c
I g-VSQ
pageSize; Mk|h ><Q"
if(previousIndex < 0) '$1-A%e$1
return0; %>xW_5;Z
else &E {/s
return previousIndex; 6$)Yqg`X
} L V33vy
W|D'S}J
} g6QkF41nG
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7F\U|kx_
抽象业务类 s;8J= \9W
java代码: T"9`[Lzva
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/** w|?Nq?KA
* Created on 2005-7-12 r^ #.yUz
*/ >4~{CXZ
package com.javaeye.common.business; Xd|@w{.m*
aKH\8O4L5
import java.io.Serializable; A{5k}
import java.util.List; Ha)w*1&w"
|;rjr_I
import org.hibernate.Criteria; /kx:BoV
import org.hibernate.HibernateException; i7e{REBXb
import org.hibernate.Session; H0tjN&O_
import org.hibernate.criterion.DetachedCriteria; ttZ!P:H2
import org.hibernate.criterion.Projections; _~Lhc'^p*
import s(Kf%ZoE
H -.3r
org.springframework.orm.hibernate3.HibernateCallback; |4X:>Ut]
import K.l?R#G`,F
*1; <xeVD
org.springframework.orm.hibernate3.support.HibernateDaoS G-M!I`P
{l *ps-fi
upport; ^>g+:?x
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import com.javaeye.common.util.PaginationSupport; JkQ4'$:
! ~&X1,l1*
public abstract class AbstractManager extends gA~Ih
quGb;)3
HibernateDaoSupport { BR5$;-7W
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privateboolean cacheQueries = false; 0Lc X7gU>
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privateString queryCacheRegion; Sm+Ek@Ax
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publicvoid setCacheQueries(boolean
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Am kHVg
cacheQueries){ C/!2q$
this.cacheQueries = cacheQueries; ]>R`]U9*O
} ^!pagt^
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publicvoid setQueryCacheRegion(String .%WbXs
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queryCacheRegion){ iKp4@6an
this.queryCacheRegion = Pb]s+1
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queryCacheRegion; ]0m4esK`
} wQM(Lm#Q
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publicvoid save(finalObject entity){ y3;G<9K2c]
getHibernateTemplate().save(entity); ix7N q7!N
} &)xoR4!2
bmt2~!
publicvoid persist(finalObject entity){ [|k@Suv |z
getHibernateTemplate().save(entity); ^>9M2O['!s
} n]9y Cr
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publicvoid update(finalObject entity){ 'ky'GzX,
getHibernateTemplate().update(entity); w?!@fu
} *QjFrw3
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publicvoid delete(finalObject entity){ (]mN09uE
getHibernateTemplate().delete(entity); O^U{I?gQ
} wk8XD(&
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publicObject load(finalClass entity, \P{VJ^)0
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finalSerializable id){ m{R`1cN=Hg
return getHibernateTemplate().load g~10K^
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(entity, id); Z[0xqGYLB
} Qs;bVlp!H
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publicObject get(finalClass entity, 17<\Q(YQ=
}4eSB
finalSerializable id){ +sgishqn9
return getHibernateTemplate().get gR~XkU
xQaN\):^8
(entity, id); n6L}#aZG
} SwSBQq%h]M
h7*fjw-Xz[
publicList findAll(finalClass entity){ :j?Lil%R
return getHibernateTemplate().find("from HlI*an
c1MALgK~}\
" + entity.getName());
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} q'c'rN^
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publicList findByNamedQuery(finalString IU Dp5MIuR
XL} oYL]}&
namedQuery){ =GnDiI
return getHibernateTemplate q1NAKcA<U
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().findByNamedQuery(namedQuery); "MK:y[+*
} LRB#|PW
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publicList findByNamedQuery(finalString query, .D)'ZY
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finalObject parameter){ Qy@chN{eP
return getHibernateTemplate AX]lMe
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().findByNamedQuery(query, parameter); ~p8-#A)X,)
} L6 hTz'
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publicList findByNamedQuery(finalString query, a7OD%yQ
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finalObject[] parameters){ DFR.F:O%
return getHibernateTemplate a{Tv#P*!
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().findByNamedQuery(query, parameters); `sJkOEc`
} ?L{[84GSO
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publicList find(finalString query){
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return getHibernateTemplate().find `C] t2^
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(query); #Du1(R
} 7c4\'dt#
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publicList find(finalString query, finalObject ho fZpM
9:YiLoz?
parameter){ d
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return getHibernateTemplate().find kF6X?mqgD
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(query, parameter); XP6R$0yN
} ]}KmT"vA
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public PaginationSupport findPageByCriteria ddlLS
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(final DetachedCriteria detachedCriteria){ ,Iwri\
return findPageByCriteria Tv~<W4
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"
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 9s5CqB
} 5XA6IL|/l
)}n`MRDB
public PaginationSupport findPageByCriteria J%3S3C2*m
tC-(GDGy5
(final DetachedCriteria detachedCriteria, finalint _YO`x
. (Q;EF`_U
startIndex){ J<u,Y= -~
return findPageByCriteria el7P
m{gt(n
(detachedCriteria, PaginationSupport.PAGESIZE, :4&qASn
xJN
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startIndex); LnrR#fF]Z
} N;<<-`i
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public PaginationSupport findPageByCriteria XSn^$$S
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(final DetachedCriteria detachedCriteria, finalint q.uIZ
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pageSize, \W}?4kz
finalint startIndex){ ^<[oKi;>
return(PaginationSupport) <iJ->$
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getHibernateTemplate().execute(new HibernateCallback(){ xREqcH,vU
publicObject doInHibernate @6}c\z@AxM
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(Session session)throws HibernateException { kM]?
Criteria criteria = XvZg!<*OH
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detachedCriteria.getExecutableCriteria(session); C4TJS,!1rH
int totalCount = 7cY_=X-?Y
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((Integer) criteria.setProjection(Projections.rowCount "A,]y E
tlI3jrgw
()).uniqueResult()).intValue(); G5bi,^G7
criteria.setProjection qmtVk
B5zu?AG
(null); [1 w
List items = YeYFPi#
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criteria.setFirstResult(startIndex).setMaxResults L?4c8!Q
nWmc
(pageSize).list(); H_vOZ0
PaginationSupport ps = a}0\kDe
0[);v/@Ho
new PaginationSupport(items, totalCount, pageSize, s|%mGt &L
qW$IpuK
startIndex); Y'%sA~g
return ps; AX<TkS@wjb
} }!lLA4XRr
}, true); [$OD+@~A2
} 2,E&}a|;b
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public List findAllByCriteria(final h,rGa\X~0
QYyF6ht=!
DetachedCriteria detachedCriteria){ 6wIv7@Y
return(List) getHibernateTemplate kHm1aE<
dkLc"$(O
().execute(new HibernateCallback(){ *N[.']#n
publicObject doInHibernate O&E1(M|*>
FFK79e/5
(Session session)throws HibernateException { 9k& lq$
Criteria criteria = #O\4XZ,Lv
9 qqy( H
detachedCriteria.getExecutableCriteria(session); x44)o:
return criteria.list(); %Kd8ZNv
} S-Ryt>G
}, true); vn6/H8
} 5i83(>p3]e
2W$c%~j$2
public int getCountByCriteria(final CZxQz
no)Spo'
DetachedCriteria detachedCriteria){ c{V0]A9VF
Integer count = (Integer) +\\*Iy'xK
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getHibernateTemplate().execute(new HibernateCallback(){ :hjeltt
publicObject doInHibernate -r/# 20Y
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(Session session)throws HibernateException { [
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Criteria criteria = y%v<Cp@R
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detachedCriteria.getExecutableCriteria(session); KaBze67<|
return J &u&G7#S
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criteria.setProjection(Projections.rowCount =_D82`p
Q^b_+M
()).uniqueResult(); 9Rb-QI
} &gIu<*u<
}, true); =}Bq"m
return count.intValue(); 7.hVbjy'-
} S%kE<M?
} rs=wEMq/
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用户在web层构造查询条件detachedCriteria,和可选的 |.*),t3
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 *<Fz1~%*
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PaginationSupport的实例ps。 [WRs1$5
ryW1OV6?_0
ps.getItems()得到已分页好的结果集 jF Bq>
ps.getIndexes()得到分页索引的数组 bqsb (C
ps.getTotalCount()得到总结果数 ^ Gq2"rDM
ps.getStartIndex()当前分页索引 jtS+y)2
ps.getNextIndex()下一页索引 gD@ &/j7
ps.getPreviousIndex()上一页索引 w4:n(.;HK
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 k#c BBrY
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 c^6v7wT5
a_`E'BkgU
一下代码重构了。 H{\tQ->(2
*O)_D
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我把原本我的做法也提供出来供大家讨论吧: 8v*>~E/0
>#$(M5&}-
首先,为了实现分页查询,我封装了一个Page类: HvKueTQ
java代码: MPAZ%<gmD
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/*Created on 2005-4-14*/ P9B@2#
package org.flyware.util.page; 0u,=OvU
PJAE~|a
/** j<szQ%tJlI
* @author Joa l0U6eOx
* h:z;b;
*/ -E2[PW4$
publicclass Page { J.$<Lnt>u
7. G
/** imply if the page has previous page */ xv$^%(Ujp
privateboolean hasPrePage; >QE^KtZ
95T%n{rz
/** imply if the page has next page */ pnxjuDN7}x
privateboolean hasNextPage; U`W^w%
>-s}1*^=oD
/** the number of every page */ R`76Ae`R8
privateint everyPage; d;mQ=k
1
p? iJ'K
/** the total page number */ j72cSRv
privateint totalPage; ;wL*
Te[[xhTyw
/** the number of current page */ j /)cdP
privateint currentPage; pEH[fA]
>u*woNw(XM
/** the begin index of the records by the current d=oOMXYa
I%e7:cs >
query */ JV36@DVQ
privateint beginIndex; c5;YKON
B
0 K2Uw
Y@9L8XNP>
/** The default constructor */ tPO.^
public Page(){ ?9H7Twi+T
**_VNDK+
} |GdA0y\v*}
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/** construct the page by everyPage <j:3<''o
* @param everyPage reu[}k ~
* */ IH\k_Yf#u
public Page(int everyPage){ u8+<uWB
this.everyPage = everyPage; iUS379wM}
} v
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k{c~
/** The whole constructor */ }2`S@Rq.WW
public Page(boolean hasPrePage, boolean hasNextPage, By3dRiM=,2
F|xXMpC.f
@h>#cwhU
int everyPage, int totalPage, zHb<YpU
int currentPage, int beginIndex){ oxO}m7ULH
this.hasPrePage = hasPrePage; oq8~PTw
this.hasNextPage = hasNextPage; 6WceDY
this.everyPage = everyPage; j"94hWb
this.totalPage = totalPage; 4fzq C)
this.currentPage = currentPage; xBgf)'W_Z
this.beginIndex = beginIndex; y^;qT_)#
} A'[A!NL%
:vurU$\
/** ^3=8*Xr
* @return 7c
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* Returns the beginIndex. &sS k~:
*/ _j%Rm:m;<
publicint getBeginIndex(){ pxI*vgfN7
return beginIndex; (g7nMrE$j
} JGj_{|=:
<(BA ws(X
/** YLSG
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* @param beginIndex 3q pkMu3
* The beginIndex to set. _JR4
PKtx
*/ hZ2PP ^
publicvoid setBeginIndex(int beginIndex){ 7MoO2
this.beginIndex = beginIndex; +QldZba
} )&_{m
K
zE<vFP-1v
/** CvbY2_>Nh
* @return ec=4L@V*
* Returns the currentPage. HS(<wI
*/ y{j>4g$:z
publicint getCurrentPage(){ t&eD;lg :
return currentPage; xZ;';}&pj
} )B}]0`z:P
A8Jbl^7E+
/** _F@FcFG1Z*
* @param currentPage J,7_5V@jJ
* The currentPage to set. @Cz1rKU^l
*/ k;LENB2iv
publicvoid setCurrentPage(int currentPage){ +s[(CI.b
this.currentPage = currentPage; q8kt_&Ij
} g^0
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/** zR{TWk]
* @return gvcT_'
* Returns the everyPage. f^$\+H"W
*/ \s~W;m
publicint getEveryPage(){ 3J(STIxg
return everyPage; kY_UY~E
} qZ1fQN1yG
0
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/** YLFTf1G9
* @param everyPage r5s*"z
* The everyPage to set. }\gpO0Ox
*/ mY`b|cS3p$
publicvoid setEveryPage(int everyPage){ W]M[5p]*
this.everyPage = everyPage; N#[/h96F
} 6PPvfD^
\ g0
/** U{ahA
* @return R0/~)
P
* Returns the hasNextPage. ZT^PL3j+
*/ [Xz7.<0#U
publicboolean getHasNextPage(){ Mm/GIa
return hasNextPage; O$&p<~
} n"dT^
g
V).M\
/** .pdgRjlSn
* @param hasNextPage ?^"S%Vb
* The hasNextPage to set. 7gJy xQ
*/ @l;f';+
publicvoid setHasNextPage(boolean hasNextPage){ O]~p)E
this.hasNextPage = hasNextPage; x`o_&09;CG
} hOwVm;:
[6/%ynlP
/** ;$%+TN
* @return
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* Returns the hasPrePage. aqyXxJS8
*/ P,>#
publicboolean getHasPrePage(){ Wg$MKc9Vy[
return hasPrePage; A$5!]+
} -7pZRnv
l[.pI];T
/** [e*8hbS
* @param hasPrePage "arbUX~d
* The hasPrePage to set. zF{z_c#3@
*/ yXEC@#?|
publicvoid setHasPrePage(boolean hasPrePage){ FijzO
this.hasPrePage = hasPrePage; ] xH `
} L^0jyp
,YiBu^E9
/** TnKe"TA|9
* @return Returns the totalPage. Zd5frc$
* |H
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*/ sXfx[)T<
publicint getTotalPage(){ n=yFw\w'
return totalPage; =nY*,Xu<
} @0)bY*njj
#cmj?y()
/** : 0%V:B
* @param totalPage ( E0be.
* The totalPage to set. k@wxN!w;
*/ zb9$
publicvoid setTotalPage(int totalPage){ 7%?A0%>6G
this.totalPage = totalPage; '7E?|B0],
} @,s[l1P
| 9(uiWf
} 4W1"=VL[g
|\b*p:el
K(Cv9YQ
/[us;=CM
*.i`hfRc
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 nNL9B~d
WJg?R^
个PageUtil,负责对Page对象进行构造: QU\|RX
java代码: ,Z52dggD
py,z7_Nuh
M/#<=XhA
/*Created on 2005-4-14*/ [1Vh3~>J6
package org.flyware.util.page; un..UU4
W/&cnp\
import org.apache.commons.logging.Log; p'_*>%4~
import org.apache.commons.logging.LogFactory; tt`b+NOH>
m"xw5aa>
/** Z$+0gm\Cnw
* @author Joa Bh@j6fv
* N]5-#
*/ !rwv~9I
publicclass PageUtil { //AS44^IS
#5'9T:8
privatestaticfinal Log logger = LogFactory.getLog ,H.q%!{h_
q5QYp
(PageUtil.class); P+oZS
{E!$<A9
/** z?+N3p9
* Use the origin page to create a new page A!hkofQ
* @param page DMf:u`<
* @param totalRecords :GO}G`jY
* @return ^OYar(
*/ \f%jN1z
publicstatic Page createPage(Page page, int eyUo67'7
IF@)L>-%
totalRecords){ Rb\\6BU0
return createPage(page.getEveryPage(), (u RAK
{HQ?
page.getCurrentPage(), totalRecords); #:236^xYS
} sH#UM(N
Dmn6{jyP
/** CB6<Vng}C
* the basic page utils not including exception k+%6:r,r&
e6]u5;B
r
handler 72Ft?;R
* @param everyPage N0/DPZX7
* @param currentPage ?mrG^TV^+r
* @param totalRecords /Wk\6
* @return page LUJKR6oT{>
*/ Lymy/9
publicstatic Page createPage(int everyPage, int Ga$+x++'*
Xgc@cwd
currentPage, int totalRecords){ qifX7AXHr
everyPage = getEveryPage(everyPage); -Vw,9VCF
currentPage = getCurrentPage(currentPage); ,GGr@})
int beginIndex = getBeginIndex(everyPage, lS9rgq<n
P b2exS(
currentPage); p]IF=~b
int totalPage = getTotalPage(everyPage, YW0UIO
:X/j%m*
totalRecords); 1_*o(HR
boolean hasNextPage = hasNextPage(currentPage, IU/dY`J1
vJ }^p}
totalPage); ;aWH`^{i
boolean hasPrePage = hasPrePage(currentPage); :SziQQ
T/uj5pMG
returnnew Page(hasPrePage, hasNextPage, fY$M**/,
everyPage, totalPage, jj.i W@m
currentPage, !{"{(h)+@
GuNzrKDr
beginIndex); 8
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} ~[ isR|>
05.^MU?^U
privatestaticint getEveryPage(int everyPage){ TU7 Qt<
return everyPage == 0 ? 10 : everyPage; LEWeybT
} U c$RYPq
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privatestaticint getCurrentPage(int currentPage){ HTvA]-AuM
return currentPage == 0 ? 1 : currentPage; 8?h-H#h
} ytKh[Uo
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privatestaticint getBeginIndex(int everyPage, int 9JpPas$]
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currentPage){ ; Sq_DP1W
return(currentPage - 1) * everyPage; O}"VK
} pQ!NhzQ
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privatestaticint getTotalPage(int everyPage, int xP
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>@rsh-Z
totalRecords){ c54oQ1Q&"
int totalPage = 0; 5iwJdm
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if(totalRecords % everyPage == 0) SBgBZm}%
totalPage = totalRecords / everyPage; 3g`uLA X>u
else :q<8:,rP
totalPage = totalRecords / everyPage + 1 ; \f5$L`
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return totalPage; y}FTLX $
} tQ&.;{5[f
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privatestaticboolean hasPrePage(int currentPage){ pMe'fC~*
return currentPage == 1 ? false : true; NVAt-u0LB
} yL7D;<!S&
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privatestaticboolean hasNextPage(int currentPage, P=OHiG\z
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int totalPage){ py6|uGN
return currentPage == totalPage || totalPage == =rMT1
nm_]2z O
0 ? false : true; $0~H~-
} s=h
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} 6*J`2U9Q
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P4-`<i]!S
q;3.pRw(
N0,wT6.
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。 */;[ -9
F#*vJb)
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 *$1M=$
u^8:/~8K
做法如下: Y!N*J
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 M{<cqxY
BqC!78Y/e
的信息,和一个结果集List: w]J9Kv1)-
java代码: GsA/pXx
XCc/\
jeXv)}
/*Created on 2005-6-13*/
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package com.adt.bo; SV0E7qX
71_{FL8
import java.util.List; !o1{. V9q
w7@fiH{
import org.flyware.util.page.Page; 3(0k!o0"
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/** `xMmo8u4
* @author Joa
) jv]Oz
*/ TPH`{
publicclass Result { ViIt'WX
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private Page page; sEP-jEuwG
fl #gWAM
private List content; (Z;;v|F.i=
<5X?6*Qvr
/** r~&"D#)sy
* The default constructor %5Hsd
*/ \
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public Result(){ N3nFE:`u]
super(); mrX 2w
} i`U:uwW`
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/** 5 0uYU[W
* The constructor using fields M0zJGIT~b
* ofH=h
* @param page ^m8T$^z>
* @param content Dvbrpn!sk
*/ q1}HsTnBH
public Result(Page page, List content){ g`I`q3EF)
this.page = page; q<