Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 8M9 &CsT6
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 U ?P5cN
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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 rnz9TmN:*1
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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 Yq-Nk:H|
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。 :biM}L
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分页支持类: =(Y 1y$
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java代码: -`x$a&}
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package com.javaeye.common.util; {1,]8!HBJ
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import java.util.List; L8("1_
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publicclass PaginationSupport { :SjTkfU
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publicfinalstaticint PAGESIZE = 30; phr6@TI
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privateint pageSize = PAGESIZE; m_{OCHS+
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privateList items; ;`Eie2y{M
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privateint totalCount; f|G,pDLx
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privateint[] indexes = newint[0]; FjYih>
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privateint startIndex = 0; (jv!q@@2C.
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public PaginationSupport(List items, int chv0\k"'
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totalCount){ ""Nu["|E
setPageSize(PAGESIZE); U+gOojRy{
setTotalCount(totalCount); 9Ps[i)-
setItems(items); ihivJZ
setStartIndex(0); *<?or"P
} #
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public PaginationSupport(List items, int *ILx-D5qr
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totalCount, int startIndex){ ZS[(r-)$F
setPageSize(PAGESIZE); k9H7(nS{
setTotalCount(totalCount); JbN@AX:%
setItems(items); ~"F83+RDe
setStartIndex(startIndex); CMn&1
} cz<8Kb/XV
NfqJ>[}I+
public PaginationSupport(List items, int MN1
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-{H;w=9
totalCount, int pageSize, int startIndex){ gn"Y?IZ?
setPageSize(pageSize); 2(~Y ^_
setTotalCount(totalCount); )f(.{M
setItems(items); DtkY;Yl
setStartIndex(startIndex); ?0k(wiF
} DrE
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publicList getItems(){ m:|jv|f
return items; Esh3cn4
} z*?-*6W
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publicvoid setItems(List items){ vpR^G`/
this.items = items; &E|2-)
} H>Wi(L7
#Ezq}F8Y
publicint getPageSize(){ F)P"UQ!\
return pageSize; _cra_(b
} $U=E7JO
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publicvoid setPageSize(int pageSize){ <-KHy`u
this.pageSize = pageSize; m>dZ n
} Sj?u^L8es}
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publicint getTotalCount(){ @pq#?
return totalCount; *xm(K+j
} *=UxX ]0y
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publicvoid setTotalCount(int totalCount){ E+ wd9/;
if(totalCount > 0){ TS0x8,'$q
this.totalCount = totalCount; 0].x8{~o
int count = totalCount / (bEX"U-
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pageSize; ];BGJ5^j
if(totalCount % pageSize > 0) 01v7_*'R
count++; >s#[dr\ww
indexes = newint[count]; eeIaH
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for(int i = 0; i < count; i++){ o!.\+[
indexes = pageSize * Wr3j8"f/
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i; E({+2}=1
} u6&<Bv
}else{ r(sQI#
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this.totalCount = 0; "-aak )7w
} JNhHQvi\
} HU[a b
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publicint[] getIndexes(){ 9=,^^,q
return indexes; !e~Yp0gX#
} K:PzR,nn
scmn-4j'{
publicvoid setIndexes(int[] indexes){ }$DLa#\-
this.indexes = indexes; hjCFN1 #Sa
} zh5'oE&[yC
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publicint getStartIndex(){ X r7pFw
return startIndex; '[u=q
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} VayU
/18Z4TA
publicvoid setStartIndex(int startIndex){ R#j-Z#/"
if(totalCount <= 0) rMDo5Z2
this.startIndex = 0; Hya ";'
elseif(startIndex >= totalCount) 5rG&Z5
this.startIndex = indexes t;BvKH77
ENu`@S='I3
[indexes.length - 1]; vfID@g`!q+
elseif(startIndex < 0) 3{e7j6u\
this.startIndex = 0; [hy:BV6H+
else{ gH87e
this.startIndex = indexes ;zy[xg.7
ejq2]^O4c
[startIndex / pageSize]; C)^FRnb
} :uM2cc^
} vCC}IDd
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publicint getNextIndex(){ YG2rJY+*
int nextIndex = getStartIndex() + L #'N
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pageSize; M6n9>aW4
if(nextIndex >= totalCount) KP)BD;
return getStartIndex(); iUuG}rqj
else -$pS
{q;
return nextIndex; ]W,K}~!
} >z0~!!YZ
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publicint getPreviousIndex(){ m5KB #\
int previousIndex = getStartIndex() - ~50b$];y
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pageSize; NwQexYm1_
if(previousIndex < 0) z-(#Mlq:!
return0; .H1kl)~V
else nnBgTtsC]
return previousIndex; V\axOz!
} .E!p
}5n((7@X
} r,p6J7/lfS
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抽象业务类 '&L ;y
java代码: x'Z<
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/** `?{Hs+4P5
* Created on 2005-7-12 %qA +zPf
*/ =~r?(u6d
package com.javaeye.common.business; p'afCX@J
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import java.io.Serializable; )"7hyW 5
import java.util.List; KZ
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import org.hibernate.Criteria; YxMOr\B
import org.hibernate.HibernateException; 3Rid1;L0U
import org.hibernate.Session; D
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import org.hibernate.criterion.DetachedCriteria; !Ju?REH
import org.hibernate.criterion.Projections; 2A3;#v
import I\R5Cb<p
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org.springframework.orm.hibernate3.HibernateCallback; eqbxf#H!
import l ' ]d&
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org.springframework.orm.hibernate3.support.HibernateDaoS 7Dy\-9:v
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upport; |(Zv
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import com.javaeye.common.util.PaginationSupport; T:0X-U
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public abstract class AbstractManager extends U*8;ZXi
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HibernateDaoSupport { (_ov_3
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privateboolean cacheQueries = false; mwFI89J'
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privateString queryCacheRegion; %8H*}@n
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publicvoid setCacheQueries(boolean b2
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cacheQueries){ qs6yEuh#
this.cacheQueries = cacheQueries; <!:,(V>F(C
} 8k'UEf`'(
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publicvoid setQueryCacheRegion(String <[xxCW(2
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queryCacheRegion){ p7(xk6W
this.queryCacheRegion = EWN$ILdD
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queryCacheRegion; ToJV.AdfT
} Ygn"7
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publicvoid save(finalObject entity){ lj.z>
getHibernateTemplate().save(entity); BQf}S
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} 87EI<\mP
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publicvoid persist(finalObject entity){ ~BCSm]j
getHibernateTemplate().save(entity); pTZPOv#?Q
} 0CY_nn#3
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publicvoid update(finalObject entity){ #{(?a.:
getHibernateTemplate().update(entity); P,!W\N%3
} ?/"@WP9
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publicvoid delete(finalObject entity){ io
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getHibernateTemplate().delete(entity); ro37H2^Ty
} f(DGC2R
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publicObject load(finalClass entity, e =&
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finalSerializable id){ yY*OAC
return getHibernateTemplate().load D@qq=M
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(entity, id); -;T>4B=
} /-4i"|
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publicObject get(finalClass entity, ;^:~xJFx|
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finalSerializable id){
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return getHibernateTemplate().get wpY%"x#-+=
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(entity, id); tjOfekU
} 8_f0P8R!y
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publicList findAll(finalClass entity){ !'ajpK
return getHibernateTemplate().find("from IGql^,b
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" + entity.getName()); a#! Vi93
} <PW*vo9v
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publicList findByNamedQuery(finalString 3z:
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namedQuery){ EBw}/y{Kt
return getHibernateTemplate )aquf<u@
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().findByNamedQuery(namedQuery); ?TE#4}p|
} H1|X0a(j
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publicList findByNamedQuery(finalString query, gq[}/E0e
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finalObject parameter){ yt C{,g>
return getHibernateTemplate bEbO){Fe
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().findByNamedQuery(query, parameter); M6AQ8~z
} OdRXNk:k-j
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publicList findByNamedQuery(finalString query, wias]u|
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finalObject[] parameters){ tK{`?NS
return getHibernateTemplate zo@>~G3$9
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().findByNamedQuery(query, parameters); &[I#5bGk
} }?*:uf
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publicList find(finalString query){ &z{oVU+mA
return getHibernateTemplate().find p(nC9NGB
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(query); fLc<}DF
} nT|fDD|
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publicList find(finalString query, finalObject S?hM
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parameter){ 0g]ABzTn
return getHibernateTemplate().find lDp5aT;DsM
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(query, parameter); @Z@yI2#e
} 5[I> l
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public PaginationSupport findPageByCriteria QwOQS
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(final DetachedCriteria detachedCriteria){ `ZV;Le'
return findPageByCriteria xkUsZ*X8B
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); f`WmRx]K
} ^ 9;s
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public PaginationSupport findPageByCriteria &xH>U*c
f=~@e#U
(final DetachedCriteria detachedCriteria, finalint BT d$n!'$n
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startIndex){ ]}>GUXe)^
return findPageByCriteria 56?U4wj7{
a;*&q/{o
(detachedCriteria, PaginationSupport.PAGESIZE, $6fHY\i#R
\jq1F9,
startIndex); *I'O_D
} .&r]
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public PaginationSupport findPageByCriteria (jY.S|%
+ 6r@HK`,t
(final DetachedCriteria detachedCriteria, finalint n{4&('NRFP
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pageSize, tm+}@CM^.
finalint startIndex){ N@Slc
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return(PaginationSupport) %l:%c
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getHibernateTemplate().execute(new HibernateCallback(){ 4pA<s-
publicObject doInHibernate .fo.mC@a
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(Session session)throws HibernateException { /8W}o/,s5
Criteria criteria = dP)8T
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detachedCriteria.getExecutableCriteria(session); uT;Qo{G^
int totalCount = %*}JDx#@
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((Integer) criteria.setProjection(Projections.rowCount -iH/~a
H7qda'%>
()).uniqueResult()).intValue(); VJ_E]}H
criteria.setProjection 9Eg'=YJ
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(null); X$JKEW;0BP
List items = 2vj)3%:7#E
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criteria.setFirstResult(startIndex).setMaxResults vNE91
/ d6mlQS
(pageSize).list(); 8(Z*Vz uu
PaginationSupport ps = zac>tXU;
i9.52
new PaginationSupport(items, totalCount, pageSize, Pq7YJ"Z?:
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startIndex); !\|&E>Gy
return ps; aN;L5;m#>{
} ZV;#ZXch
}, true); D"A`b{z
} OkzfQ
hC}
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public List findAllByCriteria(final C=PBF\RkKu
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DetachedCriteria detachedCriteria){ {Qw,L;R
return(List) getHibernateTemplate IUu[`\b=
w:N\]=Vh
().execute(new HibernateCallback(){ $)7-wCl</
publicObject doInHibernate (''`Ce
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(Session session)throws HibernateException { "me Jn/
Criteria criteria = GueqpEd2
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detachedCriteria.getExecutableCriteria(session); fWKv3S1dT
return criteria.list(); [eWB
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} .`)ICX
}, true); ||L qx#e=
} y\x!Be;6Z.
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public int getCountByCriteria(final R
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BT#'<!7!
DetachedCriteria detachedCriteria){ xTAC&OCk^[
Integer count = (Integer) y'4=
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getHibernateTemplate().execute(new HibernateCallback(){ j/^0q90QO
publicObject doInHibernate p(Qm\g<
)}u.b-Nt.
(Session session)throws HibernateException { +(|T\%$DT
Criteria criteria = nHT2M{R
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detachedCriteria.getExecutableCriteria(session); SrHRpxy
return ?J<4IvL/
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criteria.setProjection(Projections.rowCount :Z=A,G
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()).uniqueResult(); #~p1\['|M
} {SROg;vA
}, true); vn,L),"=
return count.intValue(); TSuHY0.cp
} 'iL['4~.
} <[a9"G7
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})"9TfC
]
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用户在web层构造查询条件detachedCriteria,和可选的 pQEHWq"Q
rcQ?E=V2O
startIndex,调用业务bean的相应findByCriteria方法,返回一个 @+xkd(RfN
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PaginationSupport的实例ps。 0c:CA>F
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ps.getItems()得到已分页好的结果集 J@yy2AZnO
ps.getIndexes()得到分页索引的数组 Q) FL|
ps.getTotalCount()得到总结果数 g7d) YUc
ps.getStartIndex()当前分页索引 $> #PhOC
ps.getNextIndex()下一页索引 ^QFjBQ-Hai
ps.getPreviousIndex()上一页索引 t3bDi/m
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//6m2a
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ~'T]B{.+J
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 `9$?g|rB
K<|eZhp~
一下代码重构了。 n|^-qy'w
YR[Ii?
我把原本我的做法也提供出来供大家讨论吧: ,L_p"A
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首先,为了实现分页查询,我封装了一个Page类: JQbI^ef_;
java代码: +F67g00T|
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/*Created on 2005-4-14*/ Vwv O@G7A
package org.flyware.util.page; ]HCt%5
]A'e+RD4k
/** ~8|$KD4I
* @author Joa ][qZOIk@
* &|9?B!,`
*/ 1` 9/[2z
publicclass Page { rVf`wJ6b
jP}N^
/** imply if the page has previous page */ R\X=Vg
privateboolean hasPrePage; Dy8Go4
Z"E+ TX
/** imply if the page has next page */ 2Jj`7VH>
privateboolean hasNextPage; N*o+m~:y
&O!d!Pf
/** the number of every page */ u,'c:RMV
privateint everyPage; flmcY7ZV
TYLf..i<
/** the total page number */ orL7y&w(v:
privateint totalPage; wBmbn=>#S
\3Xt\1qN4
/** the number of current page */ E>7%/TIl
privateint currentPage; %0"o(y+zt
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/** the begin index of the records by the current K$K[fcj
5Pv>`E2^
query */ 7f
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privateint beginIndex; U(i2j)|^I3
BKJW\gS2
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/** The default constructor */ T`vj6F
public Page(){ Xv'64Nc!;
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} guf+AVPno
@o>2:D1G
/** construct the page by everyPage $Y ]*v)}X
* @param everyPage qnT:x{o
* */ NP|U
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public Page(int everyPage){ @Yt[%tOF+
this.everyPage = everyPage; Lp{l&-uQ
} ,',fO?Qv'
"w|GIjE+
/** The whole constructor */ .>H7i`1D`
public Page(boolean hasPrePage, boolean hasNextPage, 4$y|z{[<
5
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)_f
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int everyPage, int totalPage, wdp4- *
int currentPage, int beginIndex){ c.d*DM}W
this.hasPrePage = hasPrePage; \WZ00Y,*
this.hasNextPage = hasNextPage; p%,JWZ[
this.everyPage = everyPage; x#pTB.
this.totalPage = totalPage; m4kmJaM
this.currentPage = currentPage; _u.l|yR
this.beginIndex = beginIndex; cL`l1:j\}
} \)LY_D:
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/** 6idYz"P %
* @return EV~_-YC
* Returns the beginIndex. WlG/7$
*/ Zb}=?fcL;@
publicint getBeginIndex(){ ~omX(kPzK
return beginIndex; ^yBx.GrQc
} R=PjLH&)
i%-c/ lop
/** Q@l3XNH|c
* @param beginIndex ^>]p4Q3 6
* The beginIndex to set. TNiFl hq
*/ F1MPo;e
publicvoid setBeginIndex(int beginIndex){ ,!Ah+x
this.beginIndex = beginIndex; ?K}/b[[0v
} f$/Daq <M
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/** :a`l_RMU
* @return b/2t@VlL
* Returns the currentPage. _D
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*/ q?\3m3GM
publicint getCurrentPage(){ y'Wz*}8pr
return currentPage; !&! sn"yD
} (8{h I
t'7)aJMP
/** ="Dmfy7
* @param currentPage o3%+FWrVTS
* The currentPage to set. Fet>KacTht
*/ o2Z#
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publicvoid setCurrentPage(int currentPage){
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this.currentPage = currentPage; m-ZVl j
} fq\E$'o$
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/** &4p:2,|r9
* @return {t9'8R3
* Returns the everyPage. @'~v~3
$S
*/ 5qUyOkI
publicint getEveryPage(){ c 8E&
return everyPage; vE&
} ?1 ?m4i
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/** LD#]"k
* @param everyPage {fk'g(E8([
* The everyPage to set. p?5`+Z
*/ E+[K?W5
publicvoid setEveryPage(int everyPage){ L# (o(4g2
this.everyPage = everyPage; G9^!=
v@
} X@jml$;$
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/** Jfo#IRC
* @return *`mwm:4
* Returns the hasNextPage. R%54!f0
%
*/ qDL9
publicboolean getHasNextPage(){ H@MUzV
return hasNextPage; QBDi;Xzb+
} uiO8F*,!&r
qfG`H#cA<
/** MJDFm,
* @param hasNextPage @K2q*d
* The hasNextPage to set. #@lLx?U
*/ D1x~d<j
publicvoid setHasNextPage(boolean hasNextPage){ ={8ClUV#
this.hasNextPage = hasNextPage; LXfDXXF
} u9sffX5x[J
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/** m$0T" `AP`
* @return 'TezUBRAz
* Returns the hasPrePage. B!rY\ ?W
*/ w_4`Wsn
publicboolean getHasPrePage(){ ?v `0KF
return hasPrePage; [
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} LB U]^t@ M
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/** BTGPP@p4
* @param hasPrePage M0 =K#/
* The hasPrePage to set. O z]iHe
*/ k q_B5L ?
publicvoid setHasPrePage(boolean hasPrePage){ ,Cde5A{K
this.hasPrePage = hasPrePage; _q+H>1.&9
} ~B|K]&/]
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/** M~p=OM<
* @return Returns the totalPage. +-K-CXt
* 8^^Xr
*/ 4GeWo@8h
publicint getTotalPage(){ ;1K.SDj
return totalPage; )0~zL} )?
} gz
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/** @My-O@C>
* @param totalPage op/|&H'
* The totalPage to set. `epO/Uu\~u
*/ ( *U Mpdj
publicvoid setTotalPage(int totalPage){ 6# ,2
this.totalPage = totalPage; UC\CCDV#^
} b&s"x?
7
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} :anUr<
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=P-kb^ s
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.Hc]?R]
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 +Ae4LeVzc
N'=8Dj
个PageUtil,负责对Page对象进行构造: k7'B5zVd
java代码: Ihw^g<X
Yfs60f
t1wNOoRa
/*Created on 2005-4-14*/ %N=-i]+Id
package org.flyware.util.page; oj;Rh!O
josc
import org.apache.commons.logging.Log; $0+AR)
import org.apache.commons.logging.LogFactory; {D 9m//x
G;>b}\Ng
/** 9jCn|+
* @author Joa >01&3-r
* 'UUIY$V[
*/ n&pi
publicclass PageUtil { ,n-M!y
v#8{pr
privatestaticfinal Log logger = LogFactory.getLog .|G([O^H
H?m9HBDpn
(PageUtil.class); 4&Y{kNF
OB.TAoH:
/** )!s f@F?
* Use the origin page to create a new page iLIH |P%
* @param page eR$qw#%c*
* @param totalRecords 2I3MV:5
* @return ]O,;t>
*/ ^M0e 0
publicstatic Page createPage(Page page, int j(AN]g:
"
;8H;U`
totalRecords){ ]p:s5Q
return createPage(page.getEveryPage(), J-P>
~
L"
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page.getCurrentPage(), totalRecords); kn:X^mDXC/
} ?>92OuG%W?
^7G@CBic"
/** f!|7j}3
* the basic page utils not including exception ds}: t.3}6
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handler (J
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* @param everyPage U%.OH?;f
* @param currentPage p2cwW/^V
* @param totalRecords (&H-v'a}3
* @return page H$bu*o-Z
*/ 8E`A`z
publicstatic Page createPage(int everyPage, int JPJ&k(P
IH(]RHTp%
currentPage, int totalRecords){ 4^/MDM@
everyPage = getEveryPage(everyPage); jNd."[IrO
currentPage = getCurrentPage(currentPage); cv})^E$x
int beginIndex = getBeginIndex(everyPage, \qj4v^\
5?9K%x'b
currentPage); (,*e\o
int totalPage = getTotalPage(everyPage, 7:awUoV8f
2K[Y|.u8>q
totalRecords); Q"itV&d,
boolean hasNextPage = hasNextPage(currentPage, &Azfpv
+ :4
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totalPage); U.g7' `Z<
boolean hasPrePage = hasPrePage(currentPage); Tk\?$n
C^oj/}^
returnnew Page(hasPrePage, hasNextPage, v50w}w'
everyPage, totalPage, 0&XdCoIe
currentPage, E]Dcb*t
{"k}C2K'r
beginIndex); sl?> X)}
} b9`vYnLk
Y_'3pX,
privatestaticint getEveryPage(int everyPage){ ,Q:Ylc8
return everyPage == 0 ? 10 : everyPage; PWUS@I
} zmaf@T
}ADdKK-
privatestaticint getCurrentPage(int currentPage){
.nh }f}j
return currentPage == 0 ? 1 : currentPage; *L7&P46
} onqfmQ,3E
as%@dUK?
privatestaticint getBeginIndex(int everyPage, int 1fajTT?
%{"v^4
currentPage){ E "9`
return(currentPage - 1) * everyPage; t*J*?Ma
} XLQt>y)
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privatestaticint getTotalPage(int everyPage, int lqdil l\
gkkT<hEV=
totalRecords){ w1>uD]
int totalPage = 0; X$mCn#8m
QAN :
if(totalRecords % everyPage == 0) V&e9?5@
totalPage = totalRecords / everyPage; &}}UdJ`
else fib#)KE
totalPage = totalRecords / everyPage + 1 ; d!>.$|b
vNo(`~]c
return totalPage; T'C^,,if
} TQhu$z<