Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 oo+nqc`,O
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 {}Q A#:V
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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 *[ @k=!73
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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 o3s ME2
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分页支持类: CO)BF%?B
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java代码: h 8ND=(
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package com.javaeye.common.util; ljS~>&
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import java.util.List; |=xK-;qs
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publicclass PaginationSupport { tB,1+I=
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publicfinalstaticint PAGESIZE = 30; yv2&K=rZp
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privateint pageSize = PAGESIZE; Ah|,`0dw
8/tvS8I#y
privateList items; _NkVi_UX
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privateint totalCount; qYwEPGa\
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privateint[] indexes = newint[0]; 3lZ5N@z69
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privateint startIndex = 0; ;:^^Qfp
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public PaginationSupport(List items, int H*h 7Y*([
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totalCount){ DGQGV[9%4C
setPageSize(PAGESIZE); _Di";fe?
setTotalCount(totalCount); O|Z5SSlk
setItems(items); m$w'`[H
setStartIndex(0); fD1a)Az
} Z^fkv
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public PaginationSupport(List items, int aYmC LLj
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totalCount, int startIndex){ +VN&kCx)
setPageSize(PAGESIZE); 4ox[,
setTotalCount(totalCount); 2v;F@fUB.
setItems(items); *k (|r>
setStartIndex(startIndex); L^7"I 4=(D
} :*/'W5iM
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public PaginationSupport(List items, int b!pG&7P
Hxw 7Q?F
totalCount, int pageSize, int startIndex){ j$he5^GC
setPageSize(pageSize); )-RI
setTotalCount(totalCount); iaq+#k@ V
setItems(items); 4"=(kC~~
setStartIndex(startIndex); 6dzY9
} ?xb4y=P7
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publicList getItems(){ Q&X#(3&'
return items; !:N&tuJEv
} hm&cRehU
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publicvoid setItems(List items){ u=U.+\f5
this.items = items; |$)+h\h
} `L. kyL
LzS)WjEN
publicint getPageSize(){ AwC"c '
return pageSize; LXGlG
} _>k&,p]y
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publicvoid setPageSize(int pageSize){ LRuB&4r8
this.pageSize = pageSize; 5V{>
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} $z"1&y)
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publicint getTotalCount(){ $N[R99*x8
return totalCount; 6UXDIg=
} ISbhC!59
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publicvoid setTotalCount(int totalCount){ "s6\l~+9l
if(totalCount > 0){ &rj)Oh2
this.totalCount = totalCount; Zdm7As]
int count = totalCount / lV*dQwa?i
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pageSize; D=0^"7K
if(totalCount % pageSize > 0) m"r=p
count++; soTmKqj E
indexes = newint[count]; ^`MGlI}
for(int i = 0; i < count; i++){ f\{ynC2m
indexes = pageSize * 3T|xUY)G4
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i; k^Gf2%k
} RTJ\|#w
}else{ ):c)$$dn
this.totalCount = 0; !=Hu?F p
} (sfy14>\
} vpoYb
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publicint[] getIndexes(){ }C<<l5/ z
return indexes; !I8m(axW
} v"LH^!/
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publicvoid setIndexes(int[] indexes){ 8(b
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this.indexes = indexes; 0?{Y6:d+
} qSg=[7XOO
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publicint getStartIndex(){ EJz?GM
return startIndex; T|L_+(M{
} -fA1_ ?7S
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publicvoid setStartIndex(int startIndex){ +IM:jrT(
if(totalCount <= 0) KbcmK(`_
this.startIndex = 0; c=52*&
elseif(startIndex >= totalCount) ma%PVz`I;9
this.startIndex = indexes I_k!'zR[N
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[indexes.length - 1]; [ljC S
elseif(startIndex < 0) {wNNp't7
this.startIndex = 0; \%!
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else{ wt(Hk6/B
this.startIndex = indexes hYI0S7{G
qTA,rr#p0
[startIndex / pageSize]; /M3UK
} / p PSo
} TJhzyJ"t
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publicint getNextIndex(){ .Z0$KQ'iy
int nextIndex = getStartIndex() + _Z>I"m
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pageSize; ?e. Ge0&
if(nextIndex >= totalCount) 1>pFUf|cV
return getStartIndex(); 43HZ)3!me
else 8F;f&&L"y
return nextIndex; yG ,oSp|
} #j?SdQ
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publicint getPreviousIndex(){ B'kV.3t
int previousIndex = getStartIndex() - _^(}6o
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pageSize; [l7 G9T}/[
if(previousIndex < 0) \d&/,?,Ey
return0; I/&uiC{l@
else f0h^ULd
return previousIndex; 0]._|Ubn6)
} 9eh9@~mU"l
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} t'.oty=
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抽象业务类 c'XvZNf .C
java代码: p#
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/** uHNh|ew21
* Created on 2005-7-12 -{=c T?"+
*/ e+? -#
package com.javaeye.common.business; 2=[de Qs
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import java.io.Serializable; $X;wj5oj
import java.util.List; waYH_)Zx
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import org.hibernate.Criteria; rRK^vfoJ`
import org.hibernate.HibernateException; v6$ }saTX
import org.hibernate.Session; "4,Zox{^
import org.hibernate.criterion.DetachedCriteria; d ~`_;.z
import org.hibernate.criterion.Projections; ]JUb;B;Z
import D|lm,
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org.springframework.orm.hibernate3.HibernateCallback; )=:gO`"D
import 8!!iwmH{
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org.springframework.orm.hibernate3.support.HibernateDaoS ]\8{z"
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upport; /;K?Y#mf~j
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import com.javaeye.common.util.PaginationSupport; +I9+L6>UR
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public abstract class AbstractManager extends GY[+HgT
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HibernateDaoSupport { JOA_2qa>\
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privateboolean cacheQueries = false; QSNLo_z
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privateString queryCacheRegion; ndY1j5
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publicvoid setCacheQueries(boolean 82q_"y>6
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cacheQueries){ FV1!IE-}-
this.cacheQueries = cacheQueries; [HV9KAoA
} a BHV
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publicvoid setQueryCacheRegion(String LM~,`#3Ru
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queryCacheRegion){ yVP 1=pz_[
this.queryCacheRegion = ?Ww\D8yV&
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queryCacheRegion; ;44?`[oP
} (_Ld^^|
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publicvoid save(finalObject entity){ eL7rX"!
getHibernateTemplate().save(entity); sHr!GF
} *YhX6J1
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publicvoid persist(finalObject entity){ %L^S;v3
getHibernateTemplate().save(entity); /JOEnQ5X\!
} @Qa)@'u
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publicvoid update(finalObject entity){ 2qY+-yOEt
getHibernateTemplate().update(entity); \qU .?V[2
} =h"*1`
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publicvoid delete(finalObject entity){ )%}?p2.
getHibernateTemplate().delete(entity); Q%AD6G(7
} gkN|3^
];|;") #=
publicObject load(finalClass entity, GsG9;6c+u
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finalSerializable id){ :<`hsKy&
return getHibernateTemplate().load 'aWzam>
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(entity, id); wJ|wAS
} O0lQ1<=
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publicObject get(finalClass entity, /wjL<
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finalSerializable id){ tVf 1]3(_>
return getHibernateTemplate().get LAoX'^6
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(entity, id); ) $wX~k
} g!k'tizYD
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publicList findAll(finalClass entity){ 54A ndyeA
return getHibernateTemplate().find("from "I|[m%\
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" + entity.getName()); d9hJEu!Lu
} 4~G++|NQ
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publicList findByNamedQuery(finalString vk:m>?(
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namedQuery){ FDHa|<oz
return getHibernateTemplate D:uBr|('
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().findByNamedQuery(namedQuery); CENA!WWQ
} XOM@Pi#z
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publicList findByNamedQuery(finalString query, =a_B' ^`L
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finalObject parameter){ e3L<;MAt
return getHibernateTemplate _~M*XJ] `
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().findByNamedQuery(query, parameter); >D';i\2j&
} jocu=Se@
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publicList findByNamedQuery(finalString query, GlDl0P,*r
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finalObject[] parameters){ !5~{?sr>
return getHibernateTemplate 6m$,t-f0b
nl 7=Nhh
().findByNamedQuery(query, parameters); !V=s^8nj
} 07T"alXf:A
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publicList find(finalString query){ N[~"X**x
return getHibernateTemplate().find 0<+=Ew5Z
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(query); @x>J-Owd]J
} X9f!F2x
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publicList find(finalString query, finalObject eeuTf
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parameter){ 3N) bJ
return getHibernateTemplate().find 3B(6^iS
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(query, parameter); +fd^$Qd%K
} RNyw`>
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public PaginationSupport findPageByCriteria +_8*;k@F'
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(final DetachedCriteria detachedCriteria){ =<.8
return findPageByCriteria D]9I-|
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^
(detachedCriteria, PaginationSupport.PAGESIZE, 0); F z_SID
} \e5bxc
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public PaginationSupport findPageByCriteria h sVf/%
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(final DetachedCriteria detachedCriteria, finalint r/E;tm[\
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startIndex){ /q4<ZS#
return findPageByCriteria z?HP%g'M~
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(detachedCriteria, PaginationSupport.PAGESIZE, K .cMuh
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startIndex); n"dC]&G'
} 5FJ<y"<6
, C88%k
public PaginationSupport findPageByCriteria 3,8>\yf`
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(final DetachedCriteria detachedCriteria, finalint ?Sj3-*/?
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pageSize, KZ/U2.{O<
finalint startIndex){ p/B&R@%
return(PaginationSupport) vdloh ,
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getHibernateTemplate().execute(new HibernateCallback(){ (gQ^jmZPG
publicObject doInHibernate DFKU?#R
c|[:vin
(Session session)throws HibernateException { 0/d+26lR
Criteria criteria = 33lD`4i+
$UMxO`F
detachedCriteria.getExecutableCriteria(session); u@\]r 1
int totalCount = GZ#6}/;b
gaaW:* *y
((Integer) criteria.setProjection(Projections.rowCount $srb!&~_>
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()).uniqueResult()).intValue(); }qlU
criteria.setProjection 'dYjbQ}~;
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(null); Gn+D%5)$I
List items = , ;L
k=2]@K$%
criteria.setFirstResult(startIndex).setMaxResults "8wRxDr+
`s (A&=g\
(pageSize).list(); KH)(xB=
PaginationSupport ps = XUmL 8
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new PaginationSupport(items, totalCount, pageSize, SF2A?L?}+
2]n"7Z8(v8
startIndex); xmxfXW
return ps; @.f@N;z
} 9WsPBzi"T
}, true); $d
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} `y; s1nL
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public List findAllByCriteria(final 5n,?>>p$
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DetachedCriteria detachedCriteria){ PR=:3-#R
return(List) getHibernateTemplate p#W[he
iha{(-
().execute(new HibernateCallback(){ & IVwm"
publicObject doInHibernate $Scb8<
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(Session session)throws HibernateException { ]q DhGt
Criteria criteria = [6Y6{.%~
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detachedCriteria.getExecutableCriteria(session); [$_d|Z
return criteria.list(); D;.O# bS
} V`$Jan
}, true); z5PFppSQ
} GUJ[2/V~A
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public int getCountByCriteria(final gNJ,Bj Pd
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DetachedCriteria detachedCriteria){ "h'0&ZP~_
Integer count = (Integer) $F-qqkR$
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getHibernateTemplate().execute(new HibernateCallback(){ <Y9vc:S
publicObject doInHibernate 0UeDM*
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(Session session)throws HibernateException { YRF%].A%2
Criteria criteria = '+1<7jl&I
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detachedCriteria.getExecutableCriteria(session); ',k0_n?t
return K*Y.mM)
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criteria.setProjection(Projections.rowCount }R:e[lKj
^& ZlV
()).uniqueResult(); [OBj2=
} 1TbY,3W
}, true); } 5i0R
return count.intValue(); y#8|
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} 6>ZUx}vYj
} 9\RSJGx6
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用户在web层构造查询条件detachedCriteria,和可选的 PLR[nB7K
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 v#
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PaginationSupport的实例ps。 O1IR+"0
= M^4T?{T
ps.getItems()得到已分页好的结果集 BuMBnbT
ps.getIndexes()得到分页索引的数组 tbD>A6&VM}
ps.getTotalCount()得到总结果数 /gh=+;{
ps.getStartIndex()当前分页索引 &gxRw l
ps.getNextIndex()下一页索引 h')@NnFP1
ps.getPreviousIndex()上一页索引 S(Md
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ,<n >g;
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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 YIo$
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一下代码重构了。 =zBcfFii`w
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我把原本我的做法也提供出来供大家讨论吧: !a?$
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首先,为了实现分页查询,我封装了一个Page类: (3YCe {
java代码: xWlj.Tjt}
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/*Created on 2005-4-14*/ 7?<.L
package org.flyware.util.page; ?_q
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/** ?#"rI6
* @author Joa _]8FCO
* j#d=V@=a
*/ {_QXx
publicclass Page { tZmo= 3+:
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/** imply if the page has previous page */ 8 hx4N
privateboolean hasPrePage; J'9hzag
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/** imply if the page has next page */ j:K>3?
privateboolean hasNextPage; eAN]*:]g
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/** the number of every page */ P F#+G;q;
privateint everyPage; FWI<_KZO
_MQ)
/** the total page number */ x? 3U3\W
privateint totalPage; W1S7%6y_1
8P5yaS_
/** the number of current page */ Rhh5r0 \5
privateint currentPage; ||3%REliC
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/** the begin index of the records by the current `%}SK~<R
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query */ ;Z|X` <6g
privateint beginIndex; 7YT%.ID
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h`n,:Y^++P
/** The default constructor */ p>Dv&fX
public Page(){ 9qS~-'&q#
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} $5kb3x<W
vgY )
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/** construct the page by everyPage <uZ
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* @param everyPage vw VeHjR
* */ @\0U`*]^)
public Page(int everyPage){ 0`%eP5
this.everyPage = everyPage; \M0-$&[+Z
} yJ*`OU#
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/** The whole constructor */ !$N^Ak5#
public Page(boolean hasPrePage, boolean hasNextPage, {`,dWjy{%
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int everyPage, int totalPage, uFQ;}k;}
int currentPage, int beginIndex){ vYQ0e:P
this.hasPrePage = hasPrePage; $SAq/VHI1]
this.hasNextPage = hasNextPage; @9_H4V
this.everyPage = everyPage; . 4E5{F{~
this.totalPage = totalPage; =K'X:UM
this.currentPage = currentPage; AjBwj5K
this.beginIndex = beginIndex; _N!L?b83P
} 2"+8NfFl
" &2Kvsz
/** "D#+:ix8G|
* @return 91%QO?hz
* Returns the beginIndex. BSt^QH-'
*/ }jHS
publicint getBeginIndex(){ ~I[Z2&I
return beginIndex; "TW%-67
} KMC]<
rTTde^^_
/** iAD'MB
* @param beginIndex 6.%M:j00E
* The beginIndex to set.
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*/ xgoG>~F
publicvoid setBeginIndex(int beginIndex){ | 4/'~cYV
this.beginIndex = beginIndex; !9A6DWA E$
} `-@8IZ7
2;h4$^`dt
/** q"){PRTm/
* @return O[%"zO"S
* Returns the currentPage. d%+oCoeb
*/ >np!f8+d"q
publicint getCurrentPage(){ >h:rYEsh8V
return currentPage; LsaE-l
} \Ps}1)wT
cV]c/*zA
/** J>_|hg=
* @param currentPage zq]I"0Bi.
* The currentPage to set. f_A'.oq+
*/ }AfX0[!O
publicvoid setCurrentPage(int currentPage){ j9Qd
45
this.currentPage = currentPage; `pr$l
} ?VCdT`6=
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/** 4lrF{S8
* @return wUb5[m
* Returns the everyPage. 9N1Uv,OtB
*/ {A!1s;
publicint getEveryPage(){ h-r\1{Q1]
return everyPage; r{NCI
} "^M/iv(
$sF'Sr{)y
/** aumWU{j=
* @param everyPage }%e"A4v
* The everyPage to set. \S#Mc
*/ &1nZ%J9
publicvoid setEveryPage(int everyPage){ !O|d,)$q
this.everyPage = everyPage; bloe|o!
} 2gP^+.
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/** VpmwN`
* @return ivTx6-]
* Returns the hasNextPage. |,YyuCQcL[
*/ 6.#5Ra
publicboolean getHasNextPage(){ z!`aJE/
return hasNextPage; rl:6N*kK
} $D;/b+a
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/** `D
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* @param hasNextPage _8zZ.~)
* The hasNextPage to set. T}fH
*/ [l~Gwaul>
publicvoid setHasNextPage(boolean hasNextPage){ ;MSdTHN"
this.hasNextPage = hasNextPage; 72Zp%a=
} ~>2DA$Ec
87&BF)]
/** .T!R]n
* @return T2EQQFs
* Returns the hasPrePage. $a
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*/ Oe#*-
publicboolean getHasPrePage(){ H]]UsY`
return hasPrePage; %K9pnq/T^
} a4a/]q4T
5a8[0&hA 2
/** \/qo2'V
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* @param hasPrePage B!PT|
* The hasPrePage to set. sGBm[lplz
*/ A=N &(k
publicvoid setHasPrePage(boolean hasPrePage){ |4E5x9J
this.hasPrePage = hasPrePage; WA'4y\ N
} UQX.
*yx5G-#?
/** YJ6y]r
K2,
* @return Returns the totalPage. v3zd>fDnRp
* Z~X \Z.
*/ vw.rkAGY
publicint getTotalPage(){ oc|%|pmRd<
return totalPage; .$ o0$`}
} %R?B=W7;Q
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/** *s=jKV#
* @param totalPage G
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* The totalPage to set. XIep3l*
*/ Ca2He}r`
publicvoid setTotalPage(int totalPage){ -'!K("
this.totalPage = totalPage; $m
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}
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} to2#PXf]y
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 /JcfAY
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个PageUtil,负责对Page对象进行构造: E*B6k!:
java代码: y3Z\ Y[
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/*Created on 2005-4-14*/ Z91{*?
package org.flyware.util.page; L- '{
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import org.apache.commons.logging.Log; pqT+lai)#
import org.apache.commons.logging.LogFactory; >$/<~j]
ce&Q}_
/** xr*%:TwCta
* @author Joa CjQ)Bu*4
* YK{E=<:
*/ l-v(~u7
publicclass PageUtil { (GCe D-
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privatestaticfinal Log logger = LogFactory.getLog eb` !
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(PageUtil.class); c>$PLO^
n%R l$
/** {0(:5%
* Use the origin page to create a new page )'1rZb5
* @param page 1H-d<G0)
* @param totalRecords n)<S5P?
* @return ELvP<Ny}
*/ nt:d,H<p
publicstatic Page createPage(Page page, int @H83Ad
bb4 `s0
totalRecords){ 0[
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return createPage(page.getEveryPage(),
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page.getCurrentPage(), totalRecords); =xs"<Q*w>
} RE<s$B$[
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/** /0_^Z2
* the basic page utils not including exception cWU9mzsE
*+UgrsRk
handler 5R%4fzr&g
* @param everyPage A &tMj