Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 QVq+';cG
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 P)k!#*
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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 >`S $(f
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 WN`|5"?$
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分页支持类: s ;N PY
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java代码: j$Unw
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package com.javaeye.common.util; n)6mfoe
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import java.util.List; ~Q36lR
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publicclass PaginationSupport { c^a Dr
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publicfinalstaticint PAGESIZE = 30; O>)Fl42IeD
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privateint pageSize = PAGESIZE;
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privateList items; C!%\cy%Xj
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privateint totalCount; 0S}ogU[k
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privateint[] indexes = newint[0]; pZUXXX
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privateint startIndex = 0; 8kA2.pIk
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public PaginationSupport(List items, int @UgZZ
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totalCount){ Rx,Qw> #
setPageSize(PAGESIZE); I(2qXOG
setTotalCount(totalCount); R-8/BTls7
setItems(items); NvZ )zE
setStartIndex(0); ,s?7EHtC
} h7EKb-@
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public PaginationSupport(List items, int Q|^TR__
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totalCount, int startIndex){ nmLn]U=
setPageSize(PAGESIZE); }Z|uLXaz
setTotalCount(totalCount); X CjYm
setItems(items); `@Q%}J
setStartIndex(startIndex); b :Knc$
} 1lxsj{>U
I1H} 5bf3
public PaginationSupport(List items, int 78s:~|WB<{
y11/:|
totalCount, int pageSize, int startIndex){ <By6%<JTn
setPageSize(pageSize); z)Y<@2V*C
setTotalCount(totalCount); 7VF^&6
setItems(items); q+MV@8w
setStartIndex(startIndex); iaqhP7!
} }HM8VAH
@$5GxIw<l
publicList getItems(){ Yfk){1
return items; YHVJg?H3
} hSgfp
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publicvoid setItems(List items){ mulK(mp
this.items = items; <&7KcvBn"4
} cT8`l!RD<
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publicint getPageSize(){ w1J&c' -
return pageSize; dQ=mg#(
} rf+'U9
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publicvoid setPageSize(int pageSize){ C+r<DC3
this.pageSize = pageSize; *t;'I -1w^
} ;79X#hI
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publicint getTotalCount(){ 8oSndfV
return totalCount; x%ZgLvdp,
} rpsq.n
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publicvoid setTotalCount(int totalCount){ /znW$yh o
if(totalCount > 0){ 8>Xyz`$kH
this.totalCount = totalCount; <RmI)g>'_^
int count = totalCount / XEF|B--,
`}1IQ.3
pageSize; (F$V m
if(totalCount % pageSize > 0) NymS8hxR
count++; tT}*%A
indexes = newint[count]; \UI7H1XDH
for(int i = 0; i < count; i++){ n'D1s:W^B
indexes = pageSize * 5Sd+Cc
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i; _ x&Y'X|
} :\x)`lu
}else{ 4,m
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this.totalCount = 0; |3f?1:"Z
} ]KfjZ!Qh
}
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publicint[] getIndexes(){ .g.v
return indexes; f&glY`s#
} <syMrXk)R(
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publicvoid setIndexes(int[] indexes){ >HatbbA
this.indexes = indexes; '~RP+
} 4l+"J:,
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publicint getStartIndex(){ 9L;fT5Tp7
return startIndex; {-IH?!&v
} G2Eke;
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publicvoid setStartIndex(int startIndex){ /t`s.!k
if(totalCount <= 0) g+oSbC
this.startIndex = 0; p\66`\\l
elseif(startIndex >= totalCount) tW;1
this.startIndex = indexes O,"4HZG
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[indexes.length - 1]; s^F6sXhyPi
elseif(startIndex < 0) _|`~CLE[
this.startIndex = 0; bcFG$},k
else{ X(Gp3lG
this.startIndex = indexes A L|F
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[startIndex / pageSize]; Vo^
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} |T<t19
} ]ovP^]]V
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publicint getNextIndex(){ Q[EpE,
int nextIndex = getStartIndex() + >ENZ['F
hw/:
pageSize; e E:J
if(nextIndex >= totalCount) (27bNKr
return getStartIndex(); $'FPsoH
else C&Rv$<qc
return nextIndex; f& P'Kxj_
} tQ=P.14>:
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publicint getPreviousIndex(){ 4X tIMa28
int previousIndex = getStartIndex() - z\wY3pIr2
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pageSize; JB.f7-
if(previousIndex < 0) .}
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return0; C;]}Ht:~I
else [?z`XY_-
return previousIndex; *9J>3
} m,YBk<Bx
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} )5n*4A
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抽象业务类 |6@s6]%X}
java代码: Sep/N"7~t
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/** j{ QzD^t
* Created on 2005-7-12 xZbiEDU
*/ :(7icHa
package com.javaeye.common.business; .8[*`%K>
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import java.io.Serializable; >JOEp0J
import java.util.List; >#pZ`oPEAv
i`k{}!F
import org.hibernate.Criteria; pE&'Xr#P>
import org.hibernate.HibernateException; LT+QW
import org.hibernate.Session; lqaOLZH
import org.hibernate.criterion.DetachedCriteria; vG X
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import org.hibernate.criterion.Projections; LR`]C]
import C[X2]zr
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org.springframework.orm.hibernate3.HibernateCallback; dMw7UJ
import zDK"Y{
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org.springframework.orm.hibernate3.support.HibernateDaoS )h0
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upport; )\O;Rt(
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import com.javaeye.common.util.PaginationSupport; |[+/ ]Y
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public abstract class AbstractManager extends H@|h
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HibernateDaoSupport { !_i;6UVG
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privateboolean cacheQueries = false; 6B8gMO
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privateString queryCacheRegion; ]K0G!T R<
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publicvoid setCacheQueries(boolean c9/&A
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cacheQueries){ k]"DsN$
this.cacheQueries = cacheQueries; W ])Lc3X
} Z%4w{T+[
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publicvoid setQueryCacheRegion(String `fM]3]x>
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queryCacheRegion){ \2#j1/d4
this.queryCacheRegion = 4
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queryCacheRegion; Ljs4^vy<J
} . UaLP
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publicvoid save(finalObject entity){ QLLMSa+! \
getHibernateTemplate().save(entity); H"b}lf
} ?#0m[k&`
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publicvoid persist(finalObject entity){ Lk`,mjhk
getHibernateTemplate().save(entity); U$m[{r2M
} ^&!iq K2o
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publicvoid update(finalObject entity){ tO~o-R
getHibernateTemplate().update(entity); [kKg?I$D@B
} w|[{xn^R
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publicvoid delete(finalObject entity){ ?Zh,W(7W
getHibernateTemplate().delete(entity); p%#=OtkC
} ;=lQMKx0
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publicObject load(finalClass entity, qBF}-N_
b{(= C
3
finalSerializable id){ Aq,&p,m03
return getHibernateTemplate().load *5z"Xy3J
m
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(entity, id); t2hI^J0y
} Lgrpy
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publicObject get(finalClass entity, Y*-dUJK-`
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finalSerializable id){ FB }8
return getHibernateTemplate().get 3FsX3K,_X
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(entity, id); E6+ 6
} ~yu\vqN
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publicList findAll(finalClass entity){ m~R Me9Qi
return getHibernateTemplate().find("from get$r5
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" + entity.getName()); LPS]TG\
} 0I7 r{T
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publicList findByNamedQuery(finalString rtT*2k*
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namedQuery){ :$^cY>o
return getHibernateTemplate W;QU6z>
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().findByNamedQuery(namedQuery); #sb@)Q
} i _YJq;(
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publicList findByNamedQuery(finalString query, (3QG
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finalObject parameter){ gh<2i\})'
return getHibernateTemplate 66l+cb
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().findByNamedQuery(query, parameter); w3K>IDWI7
} `FRdo
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publicList findByNamedQuery(finalString query, P|rreSv*
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finalObject[] parameters){ gmdA1$c
return getHibernateTemplate U@"f( YL+"
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().findByNamedQuery(query, parameters); ^wMZG'/
}
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publicList find(finalString query){ bxvpj
return getHibernateTemplate().find x?n13C
+.IncY8C$
(query); xAu&O\V
} .aD=d\
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publicList find(finalString query, finalObject +a74] H"
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parameter){ \!s0H_RJY
return getHibernateTemplate().find }=
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' qN"!\
(query, parameter); ?~WDlj3
} <gjA(xT5
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public PaginationSupport findPageByCriteria uM@ve(8\
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(final DetachedCriteria detachedCriteria){ >f-*D25f%
return findPageByCriteria =O'>H](Q
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ,xuA%CF-S
} u8Oo@xf0Fr
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public PaginationSupport findPageByCriteria >NAg*1
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(final DetachedCriteria detachedCriteria, finalint k8O%gO
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startIndex){ TY]-L1$
return findPageByCriteria O%p+P<J
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(detachedCriteria, PaginationSupport.PAGESIZE, &v.Nj9{zi
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startIndex); %tT=q^%5
} GOj<>h}r
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public PaginationSupport findPageByCriteria l@<yC-Xd
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(final DetachedCriteria detachedCriteria, finalint v>E3|w%
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pageSize, {B)-+0 6
finalint startIndex){ @V71%D8{
return(PaginationSupport) wH0Ks5
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getHibernateTemplate().execute(new HibernateCallback(){ Fv2U@n6'v
publicObject doInHibernate }4wIfI83K,
*|^}=ioj*
(Session session)throws HibernateException { xI,7ld~
Criteria criteria = #xe-Yw1!
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detachedCriteria.getExecutableCriteria(session); Nd;,Wz]
int totalCount = O YayTKxN
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((Integer) criteria.setProjection(Projections.rowCount v5g]_v*F
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()).uniqueResult()).intValue(); :9f/d;Mo3
criteria.setProjection y)#=8oci
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(null); I%gDqfdL
List items = 5.X`[/]<r
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criteria.setFirstResult(startIndex).setMaxResults VKb'!Ystl
!a<}Mpeg
(pageSize).list(); 3*;S%1C^
PaginationSupport ps = ,V{Cy`bi
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new PaginationSupport(items, totalCount, pageSize, 8zWKKcf7t
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startIndex); 'Nn>W5#))
return ps; z3Ro*yJU
} &&er7_Q
}, true); H;=++Dh
} >+E
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public List findAllByCriteria(final =BNS3W6
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DetachedCriteria detachedCriteria){ o u*`~K|R
return(List) getHibernateTemplate |*[#Iii'
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().execute(new HibernateCallback(){ A<|]>[ax
publicObject doInHibernate $9m>(b/;n
DC6xet{
(Session session)throws HibernateException { +ZU@MOni
Criteria criteria = }!n90
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detachedCriteria.getExecutableCriteria(session); /O/pAu>
return criteria.list(); `-QY<STTP9
} ]v6s](CE
}, true); DgiMMmpE
} "2a&G3}t"
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public int getCountByCriteria(final Sm(t"#dp
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DetachedCriteria detachedCriteria){ 3Sclr/t
Integer count = (Integer) 2\, h "W(
#:st>V_h
getHibernateTemplate().execute(new HibernateCallback(){ 6l|,J`G
publicObject doInHibernate wdzZ41y1
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(Session session)throws HibernateException { 4~YPLu
Criteria criteria = (iO8[
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detachedCriteria.getExecutableCriteria(session); Wo[*P\8
return )|SmB YV
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criteria.setProjection(Projections.rowCount ;\[el<Y)s
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()).uniqueResult(); zJ7=r#b
} |wYOO(!
}, true); G<f"_NT
return count.intValue(); +#IsRiH%>
} c6"hk_
} mx:) &1
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用户在web层构造查询条件detachedCriteria,和可选的 /y~ "n4CK~
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }&I^1BHZs
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PaginationSupport的实例ps。 },@1i<Bb
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ps.getItems()得到已分页好的结果集 }VUrn2@-4
ps.getIndexes()得到分页索引的数组 /v^1/i
ps.getTotalCount()得到总结果数 aOr'OeG(=e
ps.getStartIndex()当前分页索引 LQs>[3rK
ps.getNextIndex()下一页索引 j>KJgSs]&\
ps.getPreviousIndex()上一页索引 ?z]hYsy
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 x?unE@?\S
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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 uIO<6p)
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一下代码重构了。 #_b
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我把原本我的做法也提供出来供大家讨论吧: scsN2#D7U/
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首先,为了实现分页查询,我封装了一个Page类: oJLpFL
java代码: #nv =x&g
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/*Created on 2005-4-14*/ U^n71m>]%T
package org.flyware.util.page; 5ZX P$.
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/** ?Bdhn{_
* @author Joa 0^L>J"o
* m@z.H ;
*/ i`Tp +e@a>
publicclass Page { c89+}]mGq
_Prh&Q1zs
/** imply if the page has previous page */ `k 5'nnyP
privateboolean hasPrePage; QQnpy.`:/
m~#f L
/** imply if the page has next page */ kma)DW
privateboolean hasNextPage; h
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/** the number of every page */ <:,m
privateint everyPage; =nQgS.D
n I63Ns
/** the total page number */ r\+0J`
privateint totalPage; us,!U
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/** the number of current page */ #s\HiO$BT
privateint currentPage; rW8.bMmM
|[RoR
/** the begin index of the records by the current hLqRF4>L
Mj
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query */ eVXlQO
privateint beginIndex; [dQL6k";b
qPn}$1+~
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/** The default constructor */ *[P"2b#
public Page(){ 5Hli@:B2s
J|uxn<E<>
} b-d{)-G{(
1[;
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/** construct the page by everyPage Q|DVB
* @param everyPage EDl*UG83G
* */ AqdQiZ^9
public Page(int everyPage){ @d+NeS
this.everyPage = everyPage;
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} StuQ}
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/** The whole constructor */ j5rB+
public Page(boolean hasPrePage, boolean hasNextPage, '^npZa'%sW
sRMz[n5k
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int everyPage, int totalPage, gPW% *|D,
int currentPage, int beginIndex){ bPlqS+ai_
this.hasPrePage = hasPrePage; TZl^M h[a
this.hasNextPage = hasNextPage; ZM6`:/lc
this.everyPage = everyPage; i7%v2_
this.totalPage = totalPage; *NC9S,eSP
this.currentPage = currentPage; ?ufX3yia
this.beginIndex = beginIndex; pL&
Zcpx
} l\HLlwYO
dbE]&w`?d
/** b%-S'@ew
* @return S`\03(zDA
* Returns the beginIndex. "CX@a"
*/ [f1'Qb
publicint getBeginIndex(){ ?xRx|_}e
return beginIndex; $ #*";b)QY
} 5}+&Em":
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/** 1Z h4)6x
* @param beginIndex -](NMRqfN
* The beginIndex to set. YV{^2)^
*/ `hVi!Q]*P
publicvoid setBeginIndex(int beginIndex){ TI<?h(*R_
this.beginIndex = beginIndex; ' 1 }ybSG
} BM
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/** kA"|PtrW
* @return >iKbn
* Returns the currentPage. C)a;zU;9
*/ )Z=S'm
k4_
publicint getCurrentPage(){ F?Fs x)2k
return currentPage; Qms,kX
} G2[?b2)8
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/** MmbS["A
* @param currentPage .XVW2ISv
* The currentPage to set. C5F=J8pY
*/ 2LTMt?
publicvoid setCurrentPage(int currentPage){ u^ 3,~:E
this.currentPage = currentPage; Sc/\g
} :,@\q0j"=
}<9IH%sgF
/** !P"@oJ/Yy_
* @return B*3<(eI
* Returns the everyPage. E5+-N
*/ _X6@.sM/2
publicint getEveryPage(){ Dga;GYx
return everyPage; g.wDg
} |nMg.t`8
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/** G &QG Q
* @param everyPage K-2oSS56
* The everyPage to set. s$wIL//=
*/ E |K|AdL
publicvoid setEveryPage(int everyPage){ `Q!#v{
this.everyPage = everyPage; Yf?hl
} !XqU'xxC
>oGs0mej
/** TCL XO0
* @return #WlTE&
* Returns the hasNextPage. Q^{XM
*/ 5I6u 2k3
publicboolean getHasNextPage(){ ~#];&WE
return hasNextPage; r?$V;Z
} [q!/YL3%
%nV6#pr
/** Iy#=Nq=
* @param hasNextPage _C54l
* The hasNextPage to set. p&$O}AX|
*/ uefrE53
publicvoid setHasNextPage(boolean hasNextPage){ eD,'M
this.hasNextPage = hasNextPage; kQw%Wpuq[/
} EpU}~vC9C
=fcM2O#$
/** cfC}"As
* @return :LxsiDrF[
* Returns the hasPrePage. Q.MbzSgXL
*/ {%+UQ!]d8
publicboolean getHasPrePage(){ )qua0'y]@
return hasPrePage; i?:#lbw_
} N#p%^GH
"8iIOeY-\
/**
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* @param hasPrePage >K!$@]2F
* The hasPrePage to set. z)ndj
1,#)
*/ h7kn
>q;
publicvoid setHasPrePage(boolean hasPrePage){ nt_FqUJ
this.hasPrePage = hasPrePage; <)a7Nrc\T
} ~5>k_\G8
L _Xbca=
/** f7b6!R;z_
* @return Returns the totalPage. Ei4Iv#Oi`
* `4-N@h
*/ O>eg_K,c
publicint getTotalPage(){ :{s0tw>Z
return totalPage; ~~3*o
} :?j]W2+kR
pnTz.)'46
/** (tCBbPW6T?
* @param totalPage N$.=1Q$F6
* The totalPage to set. c"diNbm[
*/ B:VGa<lx5
publicvoid setTotalPage(int totalPage){ R0urt
this.totalPage = totalPage; 73l,PJ
} Fh4Exl@6
E(_lm&,4+
} 88VI
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s&iu+>
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u
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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 Y,?kS
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个PageUtil,负责对Page对象进行构造: =@D H hg
java代码: 32Wa{LG;2
A{Qo}F<*
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/*Created on 2005-4-14*/ :<v@xOzxx
package org.flyware.util.page; X/Ii}X/p
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import org.apache.commons.logging.Log; fg/hUUl
import org.apache.commons.logging.LogFactory; a1EQ.u
MkWbPm)
/** r::0\{{r"p
* @author Joa )d>Dcne
* G[=;519
*/ 0./Rdf=-1j
publicclass PageUtil { %pLqX61t=
TAq[g|N-;
privatestaticfinal Log logger = LogFactory.getLog 4 ]ko
8@
f+?g*i
(PageUtil.class); X<H{
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/** nd[Ja_h
* Use the origin page to create a new page u
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* @param page $-.*8*9
* @param totalRecords 1@9M[_<n5
* @return v3(0Mu0J
*/ z/nW;ow
publicstatic Page createPage(Page page, int FD[4?\W]#
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totalRecords){ Lt
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return createPage(page.getEveryPage(), NN5G
'|i
DcG=u24Xy!
page.getCurrentPage(), totalRecords); U;*O7K=P
} E= .clA
ENI|e,'[
/** ,!X:wY}dW
* the basic page utils not including exception +11 oVW
/B|"<`-H
handler I:0dz:T7*
* @param everyPage )\7Cp -E-W
* @param currentPage m-#]v}0A
* @param totalRecords c=^69>w
* @return page hLVgP&/E
*/ J4s`U/F
publicstatic Page createPage(int everyPage, int f0YBy<a
r%>EiHpCU
currentPage, int totalRecords){ {:KPEN
everyPage = getEveryPage(everyPage); D_G]WW8
currentPage = getCurrentPage(currentPage); )@] W=
int beginIndex = getBeginIndex(everyPage, mX, @yCI
C
=B a|Z
currentPage); eR/X9<
int totalPage = getTotalPage(everyPage, >FJK$>[1:p
R]RLy#j
totalRecords); WI.+9$1:P
boolean hasNextPage = hasNextPage(currentPage, eLbh1L
ad52a3deR
totalPage); yo$A0Ti!w
boolean hasPrePage = hasPrePage(currentPage); !1@oZ(
$Rn9*OKr
returnnew Page(hasPrePage, hasNextPage, L(X}37
everyPage, totalPage, ca,c+5
currentPage, L`fT;2
"{d[V(lE"
beginIndex); 5HTY ~&C
} #-{ljjMQI
+ZV?yR2yn
privatestaticint getEveryPage(int everyPage){ Yp8XZ3
return everyPage == 0 ? 10 : everyPage; )}vUYTU1
} Q5IN1
^=HF
f9hH{(A
privatestaticint getCurrentPage(int currentPage){ :5jor Vu
return currentPage == 0 ? 1 : currentPage; ZmI#-[/
} i98PlAq)B
IxY!.d_s|~
privatestaticint getBeginIndex(int everyPage, int ,S~A]uH'
6)FM83zk)K
currentPage){ Eh[NKgYL
return(currentPage - 1) * everyPage; faZc18M^1
} A-eCc#I
e'=#G$S?g
privatestaticint getTotalPage(int everyPage, int 5RY rAzQo
dbF9%I@
totalRecords){ g%D.sc)69
int totalPage = 0; .e}`n)z
Ppx 4#j
if(totalRecords % everyPage == 0) 5 L-6@@/
totalPage = totalRecords / everyPage; 8P&z@E{y
else SV^[)p)
totalPage = totalRecords / everyPage + 1 ; wB<