Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 8" (j_~;
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 W/u_<\
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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 r=<1*u
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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 .B{:<;sa
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分页支持类: @m9dB P
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java代码: a#m T@l\
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package com.javaeye.common.util; |j}%"wOh
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import java.util.List;
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publicclass PaginationSupport { eNr2-R
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publicfinalstaticint PAGESIZE = 30; 3#Xv))w1
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privateint pageSize = PAGESIZE; ltOsl-OpR
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privateList items; D9\ E kX
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privateint totalCount; 8jz7t:0
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privateint[] indexes = newint[0]; lLN5***47J
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privateint startIndex = 0; T)MZ`dM
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public PaginationSupport(List items, int LNF|mS\+D
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totalCount){ x,#?
setPageSize(PAGESIZE); -S
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setTotalCount(totalCount); z W*Z
setItems(items); ,b74m
setStartIndex(0); YeB)]$'?u`
} /,JL \b
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public PaginationSupport(List items, int !uAqY\Is
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totalCount, int startIndex){ XF`?5G~~#
setPageSize(PAGESIZE); >!%+)
setTotalCount(totalCount); ~!"z`&
setItems(items); Wn5xX5H C
setStartIndex(startIndex); #%.fsJNA$
} q!<n\X3]u
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public PaginationSupport(List items, int :nxBM#:xu
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totalCount, int pageSize, int startIndex){ 0t -=*7w%
setPageSize(pageSize); 0134mw%jk
setTotalCount(totalCount); &@z
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setItems(items); "/{H=X3was
setStartIndex(startIndex); =&y6mQ
} WJii0+8e
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publicList getItems(){ \)2~oN
return items; lj@ibA]
} <O4W!UVg
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publicvoid setItems(List items){ @H8CU!J
this.items = items; cR!Mn$m
} %D E_kwL
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publicint getPageSize(){ YkI_i(
return pageSize; hd#MV!ti
} LteZ7e
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publicvoid setPageSize(int pageSize){ oZw #]Q@
this.pageSize = pageSize; >"pHk@AW K
} PPj%.i)
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publicint getTotalCount(){ <MgC7S2I
return totalCount; nOq`Cwh9
} PbY=?>0 z
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publicvoid setTotalCount(int totalCount){ NkYC( ;g
if(totalCount > 0){ 2t:CK
this.totalCount = totalCount; aThvq%;
int count = totalCount / XW BTBL
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pageSize; ^%}PRl9
if(totalCount % pageSize > 0) G(MLq"R6U
count++; I0} G,
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indexes = newint[count]; l vfplA
for(int i = 0; i < count; i++){ f<*-;
indexes = pageSize * xGt>X77
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} }/M`G]wT#
}else{ ?Y_!Fr3V
this.totalCount = 0; lh*!f$2~
} (dAE
} rz.`$
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publicint[] getIndexes(){ uX~YDy
return indexes; l#rr--];
} Fqg*H1I[
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publicvoid setIndexes(int[] indexes){ YguY5z
this.indexes = indexes; T!QAcO
} {i/7Nx
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publicint getStartIndex(){ }W5~89"
return startIndex; I$JyAj
} zI.:1(,
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publicvoid setStartIndex(int startIndex){ iB3C.wd-
if(totalCount <= 0) t^8|t(Lq
this.startIndex = 0; "hLmwz|a
elseif(startIndex >= totalCount) tiTh7qYi9
this.startIndex = indexes /9SNXjfbt
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[indexes.length - 1]; 2R~[B]2"r
elseif(startIndex < 0) (n4Uc308
this.startIndex = 0; gCv[AIE_m
else{ \x=!'
this.startIndex = indexes >W^)1E,Qh
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[startIndex / pageSize]; ]vZ}4Xno
} & hv@ &
} %QFeQ(b/(
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publicint getNextIndex(){ ]`TX%Qni
int nextIndex = getStartIndex() + o5< w2(
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pageSize;
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if(nextIndex >= totalCount) 8o[+>W
return getStartIndex(); hpzDQ6-Y
else 2 D!$x+|
return nextIndex; Vl0Y'@{
} e)A{
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publicint getPreviousIndex(){ 0l~z0pvT
int previousIndex = getStartIndex() - i
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pageSize; '2v$xOh!y
if(previousIndex < 0) (V#*}eGy
return0; #An_RU6h
else wo_iCjmK
return previousIndex; 0t.v
} JVh/<A
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} .
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抽象业务类 trM)&aQto
java代码: }Fb966 $
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/** Tizjh&*^
* Created on 2005-7-12 3Qu Ft~@@
*/ GE |P )VO
package com.javaeye.common.business; hSU|rVi
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import java.io.Serializable; xoNn'LF#u
import java.util.List; A&=`?4>
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import org.hibernate.Criteria; Pc=:j(
import org.hibernate.HibernateException; Y\{&chuF
import org.hibernate.Session; H263<^
import org.hibernate.criterion.DetachedCriteria; o&Sv2"2
import org.hibernate.criterion.Projections; `&>CK`%Xu
import :hUt7/3c
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org.springframework.orm.hibernate3.HibernateCallback; 8M7pc{
import 2jH&@g$cl;
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org.springframework.orm.hibernate3.support.HibernateDaoS uU#e54^
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upport; VMV~K7%0
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import com.javaeye.common.util.PaginationSupport; %y R~dt'
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public abstract class AbstractManager extends ~:):.5o
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HibernateDaoSupport { =\)qUs\z
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privateboolean cacheQueries = false; #{|F2AM
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privateString queryCacheRegion; {b90c'8?a
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publicvoid setCacheQueries(boolean 8u bb~ B;
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cacheQueries){ =.f<"P51k
this.cacheQueries = cacheQueries; cKH By
}
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publicvoid setQueryCacheRegion(String )GF>]|CG
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queryCacheRegion){ v#Y9O6g]T
this.queryCacheRegion = r`!S*zK
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queryCacheRegion; G~`nLC^Y
} 1J O@G3,
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publicvoid save(finalObject entity){ !UW{xHu
getHibernateTemplate().save(entity); 6yPh0n
} WU<C7
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publicvoid persist(finalObject entity){ r[y3@SE5
getHibernateTemplate().save(entity); 50^T\u
} -MT.qhx
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publicvoid update(finalObject entity){ ]^?V8*zL]
getHibernateTemplate().update(entity); b1frAA
} i 79;;9M
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publicvoid delete(finalObject entity){ o9L$B
getHibernateTemplate().delete(entity); 5sK1rDN
} :} 9Lb)Yp
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publicObject load(finalClass entity, 0FEn& \2<
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finalSerializable id){ SoJ'y6
return getHibernateTemplate().load =9'px3:'WR
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(entity, id); T1c.ER}17
} jq"iLgEMO
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publicObject get(finalClass entity, 5W~-|8m
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finalSerializable id){ R7-+@
return getHibernateTemplate().get vqnFyd
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(entity, id); 0xe*\CAo
} kmfxk/F}
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publicList findAll(finalClass entity){ /6a617?9J
return getHibernateTemplate().find("from p:q?8+W-r
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" + entity.getName()); )A H)*Mg
} 2%zJI"Ic
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publicList findByNamedQuery(finalString rytaC(
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namedQuery){ sFWH*kdP?
return getHibernateTemplate CPS1b
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().findByNamedQuery(namedQuery); NgPY/R>
} sQ8_j
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publicList findByNamedQuery(finalString query, l4`HuNR1
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finalObject parameter){ vaOCH*}h
return getHibernateTemplate >Lrud{
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().findByNamedQuery(query, parameter); HtbN7V/
} <764|q
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publicList findByNamedQuery(finalString query, li
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finalObject[] parameters){ H`028^CH$
return getHibernateTemplate )>~d`_$dt
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().findByNamedQuery(query, parameters); Da8{==
} ~*,e &I
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publicList find(finalString query){ $2+(|VG4F
return getHibernateTemplate().find dl&402
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(query); *dE5yS`H
} :ncR7:Z
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publicList find(finalString query, finalObject =ijVT_|u0
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parameter){ BPkqC >w
return getHibernateTemplate().find `lA[-x~
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(query, parameter); 4|[)D/N
} qwx{U
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public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria){ ~56F<=#,
return findPageByCriteria )@OKL0t
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 4RYvI!
} ,V}Vxq3
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public PaginationSupport findPageByCriteria G8E=E<Yg~
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(final DetachedCriteria detachedCriteria, finalint g=)djXW
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startIndex){ onOvE Y|R
return findPageByCriteria +GqV9x 8
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(detachedCriteria, PaginationSupport.PAGESIZE, CF?TW
,*Z:a4
startIndex); uY~xHV_-
} v%%;Cp73
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public PaginationSupport findPageByCriteria F;,LY:s|Z
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(final DetachedCriteria detachedCriteria, finalint OG&X7>'3I{
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pageSize, x\m?* 5p
finalint startIndex){ r-+S^mOE]
return(PaginationSupport) V% c1+h <
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getHibernateTemplate().execute(new HibernateCallback(){ eGJ}';O,g
publicObject doInHibernate !gfz4f&
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(Session session)throws HibernateException { }1/`<m
Criteria criteria = ,9:0T LLR
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detachedCriteria.getExecutableCriteria(session); PN&;3z Z
int totalCount = jdF~0#vH
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((Integer) criteria.setProjection(Projections.rowCount R#QcQx
WO=,NQOw
()).uniqueResult()).intValue(); LBkAi(0rd
criteria.setProjection Vg+jF!\7
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(null); 4Nx]*\\
List items = kroO~(\
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criteria.setFirstResult(startIndex).setMaxResults 1*>lYd8_
DE^ @b+6
(pageSize).list(); \?X'U:
PaginationSupport ps = ee=d*)
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new PaginationSupport(items, totalCount, pageSize, mq(*4KFWJ2
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startIndex); pzPm(M1^X
return ps; 1ukCH\YgU
} lVmm`q6n9
}, true); ]_ON\v1
} [H!8m7i;
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public List findAllByCriteria(final iq!u}# x_
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DetachedCriteria detachedCriteria){ n #|p R2
return(List) getHibernateTemplate 3;h%mkKQ+
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().execute(new HibernateCallback(){ o|v_+<zD!
publicObject doInHibernate 8@f=GJf
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(Session session)throws HibernateException { )|` #BC
Criteria criteria = d&'}~C`~k
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detachedCriteria.getExecutableCriteria(session); Cy~Pfty
return criteria.list(); Yc*Ex-s
} 3]X~bQAw
}, true); ?oc#$fcQ~
} Po=@
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public int getCountByCriteria(final kh'R/Dt
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DetachedCriteria detachedCriteria){ .>{.!a
Integer count = (Integer) #z*-
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getHibernateTemplate().execute(new HibernateCallback(){ lR9~LNK?
publicObject doInHibernate abVz/R/o
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(Session session)throws HibernateException { 9?
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Criteria criteria = -]?F
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detachedCriteria.getExecutableCriteria(session); ft"B,
return m R3km1T
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criteria.setProjection(Projections.rowCount
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*)2&gQ&%+
()).uniqueResult(); XSu9C zx&I
} Wn9b</tf
}, true); S$Cht6m
return count.intValue(); oA _,jsD4
} }h6N.vz
} {bSi3 oI
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用户在web层构造查询条件detachedCriteria,和可选的 %Tn0r|K
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 nI-^
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PaginationSupport的实例ps。 t/= xY'7
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ps.getItems()得到已分页好的结果集 l~/g^lN
ps.getIndexes()得到分页索引的数组 k_2W*2'S
ps.getTotalCount()得到总结果数 FK$?8Jp
ps.getStartIndex()当前分页索引 &s|&cT
ps.getNextIndex()下一页索引 .[Z<r>
ps.getPreviousIndex()上一页索引 Felu`@b
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 LV:`siK
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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 k0=$mmmPY
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一下代码重构了。 pN[G?A
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我把原本我的做法也提供出来供大家讨论吧: tr]=q9
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首先,为了实现分页查询,我封装了一个Page类: }NQ{S3JW
java代码: QT;mCD=OD
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/*Created on 2005-4-14*/ 6S;-fj
package org.flyware.util.page; f$lf(brQ:
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/** -`mHb
* @author Joa 8?lp:kM
* UqaLTdYG
*/ %n3lm(-0U
publicclass Page { m17H#!`
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/** imply if the page has previous page */ p&nIUx"
privateboolean hasPrePage; g,5r)FU`
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/** imply if the page has next page */ u0;FQr2
privateboolean hasNextPage; xZ*.@Pkr
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/** the number of every page */ ( aGwe@AS
privateint everyPage; 1!@KRV
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/** the total page number */ ;NrN#<j(!
privateint totalPage; 8+Y+\XZG
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/** the number of current page */ ,8KD-" l^g
privateint currentPage; 'V reO52
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/** the begin index of the records by the current zCdQI
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query */ +H[GD!
privateint beginIndex; s2*^ PG
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/** The default constructor */ [@U2a$k+d
public Page(){ vHY."$|H
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} ]j.??'+rg
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/** construct the page by everyPage zV(F9}^
* @param everyPage *&b~cyC
* */ aZ%
public Page(int everyPage){ o2cZ
this.everyPage = everyPage; k%iZ..
} `%lgT+~T
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/** The whole constructor */ #>m#i1Nu
public Page(boolean hasPrePage, boolean hasNextPage, w<?v78sT
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int everyPage, int totalPage, r Bv
int currentPage, int beginIndex){ S!0ocS!t
this.hasPrePage = hasPrePage; >&K1+FSmyJ
this.hasNextPage = hasNextPage; x)M=_u2 _
this.everyPage = everyPage; T{1Z(M+
this.totalPage = totalPage; i"}%ib*X
this.currentPage = currentPage; %KxL{HY
this.beginIndex = beginIndex; .".xNHR#
} M@e&uz!Rx
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/** k T$yHB #
* @return zG_e=
* Returns the beginIndex. |fXwH> 'sw
*/ 4%Q8>mEvT
publicint getBeginIndex(){ w$~|/UrLf
return beginIndex; $`:/OA<.
} hcEUkD
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/** S0V%JY;Gv
* @param beginIndex H\tz"<*``
* The beginIndex to set. B_w;2ZuA
*/ "]}+QK_
publicvoid setBeginIndex(int beginIndex){ -ec~~95
this.beginIndex = beginIndex; Las4ux[_
} 6,j6,Q(67
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/** 5}3Q}o#
* @return 38IVSK_
* Returns the currentPage. #t
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*/ {K-]nh/
publicint getCurrentPage(){ S$q:hXZ#e
return currentPage; g>h5NrDN
} -DwqoWZ
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/** 4&IBNc,sn
* @param currentPage j_PICv*6
* The currentPage to set. L1"y5HJ
*/ }
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publicvoid setCurrentPage(int currentPage){ |
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this.currentPage = currentPage; |r"1
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} Sr)rKc
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/** Zfyr&]"
* @return jIx5_lFe
* Returns the everyPage. cT
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*/ =T$-idx1l
publicint getEveryPage(){ k36%n
*4
return everyPage; >&h#t7<
} K29]B~0%E
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/** 3R%'<MV|
* @param everyPage [m7jZOEu
* The everyPage to set. mjbr}9
*/ 2F(zHa
publicvoid setEveryPage(int everyPage){ g+gHIb7{
this.everyPage = everyPage; (q+U5Ls6
} D'e'xU
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/** vS%r_gf(
* @return ;L.@4b[lP
* Returns the hasNextPage. *h Ph01
*/ &)
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publicboolean getHasNextPage(){ mc_`:I=
return hasNextPage; wXf_2qB9
} :(EU\yCzK
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/** |V{'W-`
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* @param hasNextPage p{7"a
* The hasNextPage to set. \;x+KD
*/ tE/s|v#O
publicvoid setHasNextPage(boolean hasNextPage){
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this.hasNextPage = hasNextPage; E<;C@B
} ~JY<DW7
afRUBjs
/** N<ww&GXBX
* @return \k;)m-0bj{
* Returns the hasPrePage. ou6|;*>d
*/ l+S08IZ
publicboolean getHasPrePage(){ ^ +cf
return hasPrePage; Hs<vCL \
} (NUwkAOM}
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/** u=
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* @param hasPrePage 6bCC6G
* The hasPrePage to set. +^hFs7je)
*/ O G#By6O
publicvoid setHasPrePage(boolean hasPrePage){ DzX5_ kA
this.hasPrePage = hasPrePage; M
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} eS9/-Y
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/** rgheq<B:
* @return Returns the totalPage. RS@*/.]o
* U]Q2EL\%
*/ Px:PoOw\
publicint getTotalPage(){ (</cu$w>H)
return totalPage; 2F+K(
} hH8:7i
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/** O$+J{@
* @param totalPage {4tJT25
* The totalPage to set. 1{R1:`
*/ k0.|%0?K
publicvoid setTotalPage(int totalPage){ :.Vn
this.totalPage = totalPage; XEMi~L+
} U}(*}Ut
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} |RX uO
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 Yd:8iJA
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个PageUtil,负责对Page对象进行构造: ::N'tcZ^2
java代码: "#^11 o8
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/*Created on 2005-4-14*/ pA9^-:\*
package org.flyware.util.page; io^^f|
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import org.apache.commons.logging.Log; JSQNx2VqQ
import org.apache.commons.logging.LogFactory; VqLqj$P
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/** LDHuf<`
* @author Joa B'B,,Mz
* K"-.K]O8E%
*/ <zH24[
publicclass PageUtil { -L(F:
:Zl@4}
privatestaticfinal Log logger = LogFactory.getLog `qp[x%7^
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(PageUtil.class); !T02@e/
@D&V