Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 4"kc(J`c
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Rf8Obk<
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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 ftTD-d
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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 NMK$$0U
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分页支持类: $I*}AUp
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java代码: Ve%ua]qA
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package com.javaeye.common.util; }.)R#hG?
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import java.util.List; /B?wn=][
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publicclass PaginationSupport { 8QJr!#u
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publicfinalstaticint PAGESIZE = 30; 36(qe"s
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privateint pageSize = PAGESIZE; &?bsBqpN
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privateList items; #rX^)2
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privateint totalCount; *W\ 3cS
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privateint[] indexes = newint[0]; Zqm%qm:
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privateint startIndex = 0; y4jiOhF<d
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public PaginationSupport(List items, int |OF3O,5z
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totalCount){ "KK}}$>
setPageSize(PAGESIZE); ,= ApnNUgX
setTotalCount(totalCount); S;#:~?dU
setItems(items); HN NeH;L
setStartIndex(0); 5A`>3w{3n
} 0Sd>*nC
w}l^B>Zz
public PaginationSupport(List items, int faRQj:R8
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totalCount, int startIndex){ 9)vU/fJ|
setPageSize(PAGESIZE); 6/L[`n"G
setTotalCount(totalCount); :j3'+%'2
setItems(items); ;W5.g8
setStartIndex(startIndex); =@4,szLO
} P?>:YY53
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public PaginationSupport(List items, int ]@z!r2[
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totalCount, int pageSize, int startIndex){ &2 Yo
setPageSize(pageSize); n^;-&
setTotalCount(totalCount); {ObY1Y`ea
setItems(items); h/\Zq
setStartIndex(startIndex); OXM=@B<"
} S;Sy.Lp
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publicList getItems(){ ;q9Y%*
return items; {=
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} -FZNk}
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publicvoid setItems(List items){ F%y#)53g
this.items = items; 81|[Y'f
} &&<l}E
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publicint getPageSize(){ 8v4krz<Iq
return pageSize; &?QKWxN
} IxWi>8
'j'6x'[>]
publicvoid setPageSize(int pageSize){ Z<d=v3q
this.pageSize = pageSize; jNX6Ct?
} W7|nc,i0\
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publicint getTotalCount(){ [^a7l$fmi
return totalCount; #B?lU"f8q^
} k8n9zJ8
3:WHC3}W
publicvoid setTotalCount(int totalCount){ C3=0st$
if(totalCount > 0){ <Sd ef^
this.totalCount = totalCount; (kX:@9Pn
int count = totalCount / 3;z1Hp2X
uYlyU~M:D
pageSize; m=h/A xW
if(totalCount % pageSize > 0) !sI^Lh,Y
count++; jt6_1^
indexes = newint[count]; 9wfE^E1
for(int i = 0; i < count; i++){ ?Mo)&,__
indexes = pageSize * = =pQ
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i; ;>ml@@Z
} #o~C0`8!B=
}else{ %?V~7tHm>
this.totalCount = 0; _M8'~$Sg
} `Zmdlp@
} eW<NDI&b
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publicint[] getIndexes(){ |AExaO"jk
return indexes; k fY;
} Xajt][
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publicvoid setIndexes(int[] indexes){ J=kf KQV
this.indexes = indexes; fA1{-JzV<4
} VPO~veQ
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publicint getStartIndex(){ M7Xn=jc
return startIndex; be-HF;lZe'
} zI^:{]p
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publicvoid setStartIndex(int startIndex){ Dby|l#X
if(totalCount <= 0) dlZ2iDQ%
this.startIndex = 0; dhP")@3K;p
elseif(startIndex >= totalCount) '?I3&lYz{
this.startIndex = indexes aEa.g.SZ
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[indexes.length - 1]; PpLhj
elseif(startIndex < 0) ]T5\LNyN
this.startIndex = 0; iSOyp\E|
else{ Dh}d-m_5
this.startIndex = indexes Uv<nJM
_@)-#7
[startIndex / pageSize]; ^u90N>Dvq
} k]-Q3V
} ;c|_z 9+
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}J
publicint getNextIndex(){ c*<BU6y
int nextIndex = getStartIndex() + "ig)7X+Wz|
~A%+oa*2~
pageSize; pIpdVKen
if(nextIndex >= totalCount) M|@@
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return getStartIndex(); k=p[Mlic/
else t5 ^hZZ
return nextIndex; rR{KnM
} Mg}/gO%o
gE*7[*2?t
publicint getPreviousIndex(){ zFYzus`>
int previousIndex = getStartIndex() - /VEK<.,aMv
hfc~HKLC
pageSize; )3|a_
if(previousIndex < 0) i;qij[W. z
return0; u+6L>7t88I
else D^s#pOZS
return previousIndex; *(wxNsK
} Ue`Y>T7+!
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} F4V) 0)G
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抽象业务类 vq3:N'
java代码: 5L7nEia'
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/** y=
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* Created on 2005-7-12 I+3=|Vef
*/ e:N;Jx#
package com.javaeye.common.business; |RXXj [z
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import java.io.Serializable; ;/ |tU
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import java.util.List; psiuoYf
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import org.hibernate.Criteria; IZ Q*D)
import org.hibernate.HibernateException; {7$jwk
import org.hibernate.Session; |,H2ge
import org.hibernate.criterion.DetachedCriteria; @a=jSB#B
import org.hibernate.criterion.Projections; qrZ3`@C4k
import ,5T1QWn^f
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org.springframework.orm.hibernate3.HibernateCallback; 1@TL>jq
import /&czaAR-
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org.springframework.orm.hibernate3.support.HibernateDaoS 5vS[{;<&
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upport; fb[lL7
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import com.javaeye.common.util.PaginationSupport; UbIUc}ge
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public abstract class AbstractManager extends @li/Y6Wh
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HibernateDaoSupport { 0#m=76[b
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privateboolean cacheQueries = false; f1U8 b*F<
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privateString queryCacheRegion; nC?Lz1re
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publicvoid setCacheQueries(boolean `]l|YQz\
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cacheQueries){ +`$$^x
this.cacheQueries = cacheQueries; X(#8EY}X
} yVK l%GO
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publicvoid setQueryCacheRegion(String 1IT(5Mleb
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queryCacheRegion){ bkpN`+c
this.queryCacheRegion = !4Sd ^"
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queryCacheRegion; /Ah'KN|EN
} NweGK
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publicvoid save(finalObject entity){ P{J9#.Zq&s
getHibernateTemplate().save(entity); v:w^$]4
} NMC0y|G
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publicvoid persist(finalObject entity){ t0/Ol'kgs
getHibernateTemplate().save(entity); cBOt=vg,5
} 4?
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publicvoid update(finalObject entity){ :v$)Z~
getHibernateTemplate().update(entity); ,iZKw8]f
} c7WOcy@M
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publicvoid delete(finalObject entity){ '*@=SM
getHibernateTemplate().delete(entity); #i*PwgC%_
} \O,yWyU4
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publicObject load(finalClass entity, 4 +p1`
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finalSerializable id){ U.I7p
return getHibernateTemplate().load 376z~
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(entity, id); Tfv@oPu
} p u?COA
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publicObject get(finalClass entity, $
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finalSerializable id){ ?=-/5A4K
return getHibernateTemplate().get y4=T0[
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(entity, id); ;WrG\R/|
} g
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publicList findAll(finalClass entity){ Pj BBXI1i
return getHibernateTemplate().find("from m0^~VK |
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" + entity.getName()); 9U )9u["DH
} T@zp'6\H
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publicList findByNamedQuery(finalString nT}i&t!q8@
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namedQuery){ X_Pbbx_j
return getHibernateTemplate LFYSur8
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().findByNamedQuery(namedQuery); $kkL)O*"]
} r5$!41
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publicList findByNamedQuery(finalString query, {FILt3f;
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finalObject parameter){ N6A|
return getHibernateTemplate xnw' &E
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().findByNamedQuery(query, parameter); WVp6/HS
} ]zIIi%
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publicList findByNamedQuery(finalString query, "s t+2#{
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finalObject[] parameters){ R -mn8N&
return getHibernateTemplate ^i3!1cS
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().findByNamedQuery(query, parameters); d+0= a]
} W58%Zz4a
A
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publicList find(finalString query){ 0|=y#`;,Z
return getHibernateTemplate().find +-5YmN'
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(query); G"6XJYoI
} ~9;udBfwF
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publicList find(finalString query, finalObject qamq9F$V
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parameter){ KhL%ov
return getHibernateTemplate().find p^ OHLT
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(query, parameter); uy<b5.!-
} iYlkc
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public PaginationSupport findPageByCriteria yDRi
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(final DetachedCriteria detachedCriteria){ N!-P2) @
return findPageByCriteria ~Ra8(KocD
# |OA>[
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 6C
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} O]!o|w(
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public PaginationSupport findPageByCriteria /o}i,i$
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(final DetachedCriteria detachedCriteria, finalint Q=#FvsF#z3
)YwLj&e4tf
startIndex){ Ya!PV&"Z
return findPageByCriteria 9}a&:QTHR
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(detachedCriteria, PaginationSupport.PAGESIZE, yOk{l$+
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startIndex); )FfS7 C\.
} oc[z dIk
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public PaginationSupport findPageByCriteria nFn}
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(final DetachedCriteria detachedCriteria, finalint 4jjo%N
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pageSize, /2tPd
finalint startIndex){ QpS7nGev
return(PaginationSupport) ?H_>?,^
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getHibernateTemplate().execute(new HibernateCallback(){ -e0?1.A$
publicObject doInHibernate &(|Ot`el]v
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(Session session)throws HibernateException { BE54L+$p
Criteria criteria = C+dz0u3s
DwWm(8&6;}
detachedCriteria.getExecutableCriteria(session); )d|s$l$?7
int totalCount = kX)*:~*
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((Integer) criteria.setProjection(Projections.rowCount !:}m-iqQ1
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()).uniqueResult()).intValue(); 0}'/3Q
criteria.setProjection G6xNR
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(null); vV"I}L
List items = bHXoZix
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criteria.setFirstResult(startIndex).setMaxResults vjA!+_I6
{]dvzoE]
(pageSize).list(); JEP9!y9y
PaginationSupport ps = gN*b~&G
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new PaginationSupport(items, totalCount, pageSize, UXwI?2L
+G,_|C2J
startIndex); [/<kPi
return ps; <Ynrw4[)t
} ][XCpJ)8
}, true); ,8cVv->u/
} +6^hp-G7
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public List findAllByCriteria(final vJsg6oH
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DetachedCriteria detachedCriteria){ ~(=5`9
return(List) getHibernateTemplate k?1e+ \
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().execute(new HibernateCallback(){ =?N$0F!
publicObject doInHibernate kv2 H3O
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(Session session)throws HibernateException { P0k.\ 8qz
Criteria criteria = *?>52 -&b
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detachedCriteria.getExecutableCriteria(session); z(#dL>d$'
return criteria.list(); $bN_0s0:'
} xU(b:D Z
}, true); o> &-B.zq
} k7(lwEgNG
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public int getCountByCriteria(final LC e6](Z
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DetachedCriteria detachedCriteria){ Iv u'0vF
Integer count = (Integer) Wq?vAnLbk
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getHibernateTemplate().execute(new HibernateCallback(){ +WguWLO"
publicObject doInHibernate QT|\TplJt
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(Session session)throws HibernateException { J~h9i=4<bF
Criteria criteria = \FnR'ne
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detachedCriteria.getExecutableCriteria(session); c_aj-`BKp
return X +/^s)
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criteria.setProjection(Projections.rowCount "#h/sAIs
N{6-a
()).uniqueResult(); Q<yvpT(
} t"5ZYa
}, true); $2a_!/
return count.intValue(); aPX'CG4m
} 14(ct
} hE'>8 {
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用户在web层构造查询条件detachedCriteria,和可选的 is^5TL%@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 7dOpJjv?)
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PaginationSupport的实例ps。 P~PM $e
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ps.getItems()得到已分页好的结果集 d^0-|sx
ps.getIndexes()得到分页索引的数组 E#cu}zi
ps.getTotalCount()得到总结果数 b{
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ps.getStartIndex()当前分页索引 hI*6f3Vn(n
ps.getNextIndex()下一页索引
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ps.getPreviousIndex()上一页索引 W'e{2u
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ^Of\l:q*
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 c4bv Jy8
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一下代码重构了。 gyU=v{].
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我把原本我的做法也提供出来供大家讨论吧: }}Gkipp
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首先,为了实现分页查询,我封装了一个Page类: .s|5AC[
java代码: q77Iq0VR
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/*Created on 2005-4-14*/ xFA`sAucr
package org.flyware.util.page; l .m #
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/** iaQFVROu
* @author Joa ^__P;Gr`
* QJI]@3
Y
*/ EEvi_Z932
publicclass Page { HaF&ooI5+
Vq^b_^
/** imply if the page has previous page */ #(Yd'qKo
privateboolean hasPrePage; i6O'UzD@T
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/** imply if the page has next page */ SUL\|z`5
privateboolean hasNextPage; oq(W|
nd5.Py$
/** the number of every page */ 2\F'So
privateint everyPage; [lzH%0
V
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/** the total page number */ |Vp
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privateint totalPage; `*]r+J2
zY].ZS=7
/** the number of current page */ .mxc~
privateint currentPage; YDgG2hT/2
cu#r#0U-
/** the begin index of the records by the current 'yh)6mid
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query */ T
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privateint beginIndex; "J`#
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/** The default constructor */ dd4^4X`j
public Page(){ ho!qXS
TnuA uui*
} iZ(JwY
n+s=u$%qn
/** construct the page by everyPage f^Q)lIv
* @param everyPage Q{~;4+ZD
* */ !VHw*fL|r
public Page(int everyPage){ ~b[5}_L=>
this.everyPage = everyPage; hl8oE5MU
} >&T J
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/** The whole constructor */ %xC}#RDf
public Page(boolean hasPrePage, boolean hasNextPage, 6f+@@=Xc
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int everyPage, int totalPage, wid
int currentPage, int beginIndex){ ixqvX4vv,B
this.hasPrePage = hasPrePage; |WgFLF~k
this.hasNextPage = hasNextPage; a24(9(yh
this.everyPage = everyPage; =$_kkVQ$
this.totalPage = totalPage; p;mV?B?oAQ
this.currentPage = currentPage; `*B6T7p1
this.beginIndex = beginIndex; ^Jc|d,u;s
} OSwum!hzN
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/** XFi9qL^
* @return
2l~qzT-
* Returns the beginIndex. 8w~X4A,
*/ 31p7oRzr
publicint getBeginIndex(){ g c<Y?a-
return beginIndex; )0=H)k0
} EIOP+9zP
k?_uv
/** pO2XQYhrY
* @param beginIndex W QeQ`pM
* The beginIndex to set. DyRU$U
*/ %KR2Vlh0
publicvoid setBeginIndex(int beginIndex){ x(:alG%#
this.beginIndex = beginIndex; JE;!~=
} #_: %Yd
2HDWlUTNVO
/** yz%o?%@
* @return Yb'%J@T}
* Returns the currentPage. '.I0n
*/ t;t;+M|W
publicint getCurrentPage(){ n9k-OGJ
return currentPage; )t$-/8
} y!~ }7=
L(HAAqRnJ
/** 5$*=;ls>J
* @param currentPage
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* The currentPage to set. zSBR_N51
*/ F 2Mxcs*M
publicvoid setCurrentPage(int currentPage){ IG!(q%Gf
this.currentPage = currentPage; AzSmfEaU0
} tjcsT>
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/** D+Z2y1
* @return
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* Returns the everyPage. *^ua2s.
*/ 2
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publicint getEveryPage(){ ixB"6O
return everyPage; 'lOpoWDL
} c']m5q39'
:{aiw?1
/** ziv*4
* @param everyPage H^jcWwy:
* The everyPage to set. F1%^,;
*/ ah#jvp
publicvoid setEveryPage(int everyPage){ RH;A|[7T&
this.everyPage = everyPage; U(hIT9
} K!v\r"N
jT4
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/** p uW
* @return $NBQv6#:
* Returns the hasNextPage. FMT_X
*/ ,2mq}u>WU
publicboolean getHasNextPage(){ s@*i
return hasNextPage; oKPG0iM:
} ~bgM*4GW
6|1*gl1_LD
/** 4p>,
* @param hasNextPage -v9x tNg
* The hasNextPage to set. H?;@r1ZAn
*/ E*L5D4Kw
publicvoid setHasNextPage(boolean hasNextPage){ Wp^A.
this.hasNextPage = hasNextPage; af&P;#U
} v|nt(-JX
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/** LKg9{0Y:
* @return tYx>?~
* Returns the hasPrePage. )Dyyb1\)
*/ ;b 'L2
publicboolean getHasPrePage(){ 5YXMnYt9
return hasPrePage; ,hCbx#h
} )4n]n:FjN
)!'7!" $
/** yp<)v(8|'
* @param hasPrePage dlwOmO'Bm)
* The hasPrePage to set. :DFtH13qO
*/ SOluTFxUw
publicvoid setHasPrePage(boolean hasPrePage){ vtRz;~,Z
this.hasPrePage = hasPrePage; zT'(I6S:)
} Q 34-a"6)
;33SUgX
/** J>fq5
* @return Returns the totalPage. 5L,q,kVS
* S~^]ib0
*/ /&5:v%L
publicint getTotalPage(){ N"zl7 .E
return totalPage; sc z8`%
} .G>~xm0
t6~~s
iQI'
/** ogoEtKi
* @param totalPage J4?SC+\
* The totalPage to set. xj JoWB
*/ nE4rB\
publicvoid setTotalPage(int totalPage){ }'h\;8y
this.totalPage = totalPage; d,o|>e$
} Us3zvpy)o
.~|[*
q\
} ;bFd*8?;
~l*[=0}
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tZ:fh p
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 z\Z+>A
2c3/iYCKP
个PageUtil,负责对Page对象进行构造: WmE4TL^8?
java代码: AA}+37@2I
n`p/;D=?
m[Qr>= "
/*Created on 2005-4-14*/ ix 5\Y
package org.flyware.util.page; 3(1UIu
vX$|/74
import org.apache.commons.logging.Log; y .a)M?3
import org.apache.commons.logging.LogFactory; W 2A!BaH%
5?TX.h9B4
/** )9+H[
* @author Joa E>F6!qYm
* peVzF'F
*/ }U**)"
publicclass PageUtil { %< Jj[F
%/R[cj8
privatestaticfinal Log logger = LogFactory.getLog /.(F\2+A
FmQiy+.|
(PageUtil.class); +d3h @gp
3C2~heO>|
/** cd4HbSp
* Use the origin page to create a new page )~#3A@
* @param page 6`5DR~
* @param totalRecords $"3cN&
* @return xC2y/?
*/ _w7yfZLv+
publicstatic Page createPage(Page page, int h-\+# .YP
*?o 'sTH
totalRecords){ %%lJyLq'Vk
return createPage(page.getEveryPage(), EH]qYF.
#YSFiy:+r_
page.getCurrentPage(), totalRecords); }jYVB|2
} isz-MP$:K5
{-yw@Kq
/** YyC$\HH6
* the basic page utils not including exception jr^btVOI#\
ty8E;['
handler "4.A@XsY
* @param everyPage ; BKu<p<
int totalPage = getTotalPage(everyPage, B%z+\<3^q
l2kUa'O-
totalRecords); 5PE}3he:
boolean hasNextPage = hasNextPage(currentPage, u3IhB8'
"nU] 2
totalPage); LPkl16yZ
boolean hasPrePage = hasPrePage(currentPage); |^gnT`+
MK <\:g
returnnew Page(hasPrePage, hasNextPage, P5v;o9B&
everyPage, totalPage, *4c5b'u
currentPage, i.e4<|{
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beginIndex); cPX^4d~9
} mH )i
L!~ap
privatestaticint getEveryPage(int everyPage){ j-t"
return everyPage == 0 ? 10 : everyPage; !'a
<Dw5
} @R ;&P