Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 .R^R32ln
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 [L>mrHqG
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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 n\GN}?4
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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 'QSj-
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分页支持类: &( ZEs c
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java代码: '2qbIYanh
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package com.javaeye.common.util; sFPh?
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import java.util.List; E]Qd5l
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publicclass PaginationSupport { !a4`SjOgu
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publicfinalstaticint PAGESIZE = 30; fh*7VuAc
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privateint pageSize = PAGESIZE; ov5g`uud
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privateList items; $0cE iq?Hf
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privateint totalCount; 33ZHrZ
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privateint[] indexes = newint[0]; B qo#cnlG
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privateint startIndex = 0; :*vSC: q
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public PaginationSupport(List items, int ]5Q)mWF
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totalCount){ 9e7):ZupO
setPageSize(PAGESIZE); uF ;8B]"
setTotalCount(totalCount); (tF/2cZk
setItems(items); T2A74>Nw
setStartIndex(0); tiy#b8
} pJ
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public PaginationSupport(List items, int ]M 2n%9
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totalCount, int startIndex){ uG+eF
setPageSize(PAGESIZE); #^_7i)=~
setTotalCount(totalCount); 3*F|`js"
setItems(items); ('`mPD,
setStartIndex(startIndex); bo??91B^7
} Y3ypca&P9
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public PaginationSupport(List items, int @7sHFwtar?
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totalCount, int pageSize, int startIndex){ cef:>>6_
setPageSize(pageSize); ]'vAeC6{
setTotalCount(totalCount); Qqd +=mgc
setItems(items); QbYNL9%
setStartIndex(startIndex); P#/s5D8
} zR%)@wh
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publicList getItems(){ m~@Lt~LZs
return items; h m(
} "^t;V+Io
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publicvoid setItems(List items){ CelM~W$=u
this.items = items; '1lz`CAB+
} 3ZAzv en
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publicint getPageSize(){ +7t: /_b~
return pageSize; QjsN7h&%
} !)OA7%3m
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publicvoid setPageSize(int pageSize){ "; ?^gA
this.pageSize = pageSize; s=XqI@
} H"rIOoxf
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publicint getTotalCount(){ K
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return totalCount; rgu7g
} 0urM@/j+
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publicvoid setTotalCount(int totalCount){ lW@i,1
if(totalCount > 0){ 5{#ya2
this.totalCount = totalCount; KkZ o|\V
int count = totalCount / Y;8.(0r/
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pageSize; R(A"6a8*
if(totalCount % pageSize > 0) /7b$C]@k
count++; +C(/.X
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indexes = newint[count]; SG3qNM: g
for(int i = 0; i < count; i++){ 4Bq4d.0
indexes = pageSize * wEIAU
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i; y7#vH<
} ]m""ga
}else{ Ks^EGy+O:-
this.totalCount = 0; M{~KT3c
} [3hOc/]s
} ,9ZN k@q
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publicint[] getIndexes(){ z,=k F I
return indexes; }5Pzen
} jiAN8t*P
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publicvoid setIndexes(int[] indexes){ V s1Z$HS`
this.indexes = indexes; =ZN~*HLl}
} "4qv
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publicint getStartIndex(){ )~[hf,R5S
return startIndex; mGqT_
} k
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publicvoid setStartIndex(int startIndex){ bT{iei]?
if(totalCount <= 0) RgT|^|ZA
this.startIndex = 0; TwXqk>J
elseif(startIndex >= totalCount) '`Iuf\
this.startIndex = indexes -V)DKf"f
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[indexes.length - 1]; )R'~{;z }
elseif(startIndex < 0) :;]iUjiC8
this.startIndex = 0; &?#G)suP
else{ W{(q7>g
this.startIndex = indexes b$:<T7vei
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[startIndex / pageSize]; 8/dx)*JCq
} na1*^S`[
} 0xYPK7a=L\
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publicint getNextIndex(){ '{?7\+o.x
int nextIndex = getStartIndex() + ]V K%6PQ0
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pageSize; '=2/0-;Jf
if(nextIndex >= totalCount) AsW!GdIN
return getStartIndex(); af<R.
else ;NHZD
return nextIndex; Ej]:j8^W
}
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publicint getPreviousIndex(){ eJJD'Z
int previousIndex = getStartIndex() - eZMDt B
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pageSize; As;@T$G
if(previousIndex < 0) F5|6* K
return0; {m)$ b
else ;ctJ9"_g
return previousIndex; .W#-Cl&n8
} WDC+Jmlgp
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} oWu2}#~z_
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抽象业务类 9BJP|L%q
java代码: ok"v`76~f5
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/** avmuI^LLs
* Created on 2005-7-12 Vy:I[@6@+
*/ &p)]Cl/`
package com.javaeye.common.business; gkJL=,
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import java.io.Serializable; D`?=]Ysz(
import java.util.List; )AxgKBW
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import org.hibernate.Criteria; csceu+IA
import org.hibernate.HibernateException; (h}5*u%h
import org.hibernate.Session; O T*C7=
import org.hibernate.criterion.DetachedCriteria; eF[CiO8F2
import org.hibernate.criterion.Projections; yMU>vr
import o7/S'Haxc]
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org.springframework.orm.hibernate3.HibernateCallback; raWs6b4Q
import u3"0K['3
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org.springframework.orm.hibernate3.support.HibernateDaoS L\cd=&b`
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upport; ne]P -50
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import com.javaeye.common.util.PaginationSupport; vD=>AAvG
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public abstract class AbstractManager extends ,buSU~c_Q
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HibernateDaoSupport { @%(Vi!Cv"R
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privateboolean cacheQueries = false; U9<AL.
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privateString queryCacheRegion; OcA_m.
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publicvoid setCacheQueries(boolean ?IKSSe#,
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cacheQueries){ o!]muO*Rm
this.cacheQueries = cacheQueries; B]KR *
} 6:fHPlqW
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publicvoid setQueryCacheRegion(String ;PS V3Zh
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queryCacheRegion){ CIxa" MW
this.queryCacheRegion = ?z
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queryCacheRegion; `"(FWK=8)"
} B(pxyv)
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publicvoid save(finalObject entity){ x0KW\<k
getHibernateTemplate().save(entity); j8cIpbp8x
} ~ u)}/
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publicvoid persist(finalObject entity){ x%v[(*F#y
getHibernateTemplate().save(entity); diz=|g=w
} \aN*x
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publicvoid update(finalObject entity){ w)rd--9f
getHibernateTemplate().update(entity); |p .o ^
} kF;N}O2?{
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publicvoid delete(finalObject entity){ xekU2u}WE
getHibernateTemplate().delete(entity); CN{xh=2qY[
} O"M2*qiH
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publicObject load(finalClass entity, u |mTF>L
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finalSerializable id){ 33=lR-N#
return getHibernateTemplate().load UkTq0-N;2
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(entity, id); 2il`'X
} kR+7JUq]
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publicObject get(finalClass entity, )n&6= Li
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finalSerializable id){ +n%d,Pz
return getHibernateTemplate().get .6=;{h4cpB
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(entity, id); *x &
} kz*6%Cg*~
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publicList findAll(finalClass entity){ 4J1_rMfh
return getHibernateTemplate().find("from B1V+CP3t
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" + entity.getName()); O'Q,;s`uC
} 2lCgUe)N
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publicList findByNamedQuery(finalString r;9 V7C
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namedQuery){ \ iA'^69
return getHibernateTemplate 8B(=Y;w
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().findByNamedQuery(namedQuery); ;Nw)zS
} vqAEF^HYry
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publicList findByNamedQuery(finalString query, (;;.[4,y
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finalObject parameter){ Q;s{M{u
return getHibernateTemplate r8tW)"?
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().findByNamedQuery(query, parameter); !rF1Remw
} 2^=8~I!n&
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publicList findByNamedQuery(finalString query, g=KvCqJN
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finalObject[] parameters){ $NCR
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return getHibernateTemplate VJP #
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().findByNamedQuery(query, parameters); dW22v!
} @^<&LG5^
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publicList find(finalString query){ @u`W(Ow
return getHibernateTemplate().find tDavp:M1v
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(query); lQiw8qD
} C>'G?
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publicList find(finalString query, finalObject 6"o=`Sq
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parameter){ `zrg?
return getHibernateTemplate().find en/ h`h]h
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(query, parameter); +0)M1!gK
} )o~/yB7
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public PaginationSupport findPageByCriteria IdMwpru(
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(final DetachedCriteria detachedCriteria){ "G~!J\
return findPageByCriteria 5|~nX8>
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); O$;#GpR
} z5oJQPPi
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public PaginationSupport findPageByCriteria OF={k[
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(final DetachedCriteria detachedCriteria, finalint 9l"=]7~%
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startIndex){ \b%c_e
return findPageByCriteria 71 %$&6
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(detachedCriteria, PaginationSupport.PAGESIZE, }:{9!RMO
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startIndex); XVqkw@Ia4!
} Bm,Vu 1]t
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public PaginationSupport findPageByCriteria :N _]*>
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(final DetachedCriteria detachedCriteria, finalint 1KrJS(.
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pageSize, W90!*1
finalint startIndex){ M;Pry3J
return(PaginationSupport) @XolFOL"f"
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getHibernateTemplate().execute(new HibernateCallback(){ 5 ,-8oEUL
publicObject doInHibernate ~G@YA8}
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(Session session)throws HibernateException { ^Z#G_%\Y:
Criteria criteria = |u?VlRt
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detachedCriteria.getExecutableCriteria(session); 'nGUm[vh
int totalCount = GW'v\O
*l{epum;
((Integer) criteria.setProjection(Projections.rowCount jzJTV4&zjs
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()).uniqueResult()).intValue(); C{pOGc@
criteria.setProjection WYTqQqQk
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(null); 3~tu\TH6d
List items = ciN\SA ZY
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criteria.setFirstResult(startIndex).setMaxResults 9/29>K_
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(pageSize).list(); @9KW ]7
PaginationSupport ps = Jg[Ao#,==
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new PaginationSupport(items, totalCount, pageSize, \ m~?yq8H
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startIndex); ]5S`y{j1
return ps; LZe)_9$
} T8z?_ *k
}, true); !`I@Rk]`c
} Icrnu}pl_
f;
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public List findAllByCriteria(final zVw5 (Tc
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DetachedCriteria detachedCriteria){ D1xGUz2r
return(List) getHibernateTemplate rl%,9JD!
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().execute(new HibernateCallback(){ Vz/w.%_g
publicObject doInHibernate v5S9h[gT
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(Session session)throws HibernateException { w7?fJ")
Criteria criteria = Om0$6O
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detachedCriteria.getExecutableCriteria(session); Z*co\ pW
return criteria.list(); c("|xe
} gfg,V.:
}, true); f?sm~PwC-
} TR0y4u[
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public int getCountByCriteria(final @=VxWU
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DetachedCriteria detachedCriteria){ &*<27-x
Integer count = (Integer) [#Y
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getHibernateTemplate().execute(new HibernateCallback(){ E?XaU~cpc
publicObject doInHibernate 2@zduL'do_
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(Session session)throws HibernateException { V|MGG
Criteria criteria = `uMEK>b
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detachedCriteria.getExecutableCriteria(session); QF"7.~~2
return 6^"QABc
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criteria.setProjection(Projections.rowCount u<BU4c/p
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()).uniqueResult(); wGArR7r
} '8X>,un
}, true); :X;G]B
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return count.intValue(); ^Pn|Q'{/p
} V,&%[H [
} Y.viOHL
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用户在web层构造查询条件detachedCriteria,和可选的 Ia&*JYM[
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }\"EI<$s
}
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PaginationSupport的实例ps。 TrjyU
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ps.getItems()得到已分页好的结果集 (g##wa)L
ps.getIndexes()得到分页索引的数组 AjVC{\Ik
ps.getTotalCount()得到总结果数 U: 9&0`k(
ps.getStartIndex()当前分页索引 INg0[Lpc
ps.getNextIndex()下一页索引 Cy~ IB [
ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 e=sc$1|4=
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 Oyl~j#h
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一下代码重构了。 O=0p}{3l
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我把原本我的做法也提供出来供大家讨论吧: W5R/Ub@g
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首先,为了实现分页查询,我封装了一个Page类: %_!/4^smE
java代码: VI!
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/*Created on 2005-4-14*/ )PYPlSQ*V
package org.flyware.util.page; [OC(~b
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/** V3,C5KKk&z
* @author Joa VUP|j/qD
* *p{p.%Qs:
*/ 1iT_mtXK$
publicclass Page { !wYN",R-
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/** imply if the page has previous page */ A c_P^
privateboolean hasPrePage; yFE0a"0y
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/** imply if the page has next page */ "*lx9bvV_
privateboolean hasNextPage; 1mFH7A($
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/** the number of every page */ _/>ktYo:
privateint everyPage; hb[ThQ
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/** the total page number */ Xu{y5N
privateint totalPage; %Wtf24'o;v
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/** the number of current page */ cW3'057
privateint currentPage; xU;SRB
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/** the begin index of the records by the current ]}`t~#Irz
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query */ a^_K@
privateint beginIndex; ra~=i|s
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/** The default constructor */ e N`+ r
public Page(){ TOiLv.Dor
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} O_ #++G
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/** construct the page by everyPage l>*X+TpA,
* @param everyPage B7Ket8<J
* */ 9fp"r,aHN&
public Page(int everyPage){ 6jpzyf=~
this.everyPage = everyPage; k4#j
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} F-kjv\
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/** The whole constructor */ O+!4KNN.-
public Page(boolean hasPrePage, boolean hasNextPage, -#%M,Qb
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int everyPage, int totalPage, Lginps[la
int currentPage, int beginIndex){ 1n8y4k)
this.hasPrePage = hasPrePage; Qi\]='C
this.hasNextPage = hasNextPage; 6$#,$a O
this.everyPage = everyPage; t|>P9lX@
this.totalPage = totalPage; %lbvK^
this.currentPage = currentPage; ?z&n I#
this.beginIndex = beginIndex; 5CnNp?.t^
} @o[ZJ4>*
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/** x`?>j$
* @return |HAbZd7PG
* Returns the beginIndex. -sHX
*/ 5[2kk5,
publicint getBeginIndex(){ P}'B~~9W
return beginIndex; o0AT&<K
} w[a(I}x
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/** Xcfd]29
* @param beginIndex jNbVp{%/S}
* The beginIndex to set. E$_zBD%
*/ ^coCsV^CW"
publicvoid setBeginIndex(int beginIndex){ Ot.v%D`e 5
this.beginIndex = beginIndex; uPho|hDp
} C}9GrIi
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/** DhxS@/
* @return 1q=Q/L4P
* Returns the currentPage. w\[l4|g`
*/ d&G]k!|\
publicint getCurrentPage(){ V ~jp
return currentPage; KKQT?/ {b
} ElTB{C>u
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/** ).HA#!SE
* @param currentPage 6
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* The currentPage to set. h#Rza-?"\
*/ iN[6}V6Sm
publicvoid setCurrentPage(int currentPage){ ]Vj($O:
this.currentPage = currentPage; x?A<X2
} 8wO4;
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/** D
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* @return -Sh&x
* Returns the everyPage. t+d7{&B
*/ PI$i_3N
publicint getEveryPage(){ dYOY8r/
return everyPage; GwXhn2
} L1+s0g>
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/** zC:Pg4=w]
* @param everyPage t@R n#(~"
* The everyPage to set. A[@koLCL
*/ OpazWcMoo
publicvoid setEveryPage(int everyPage){ I*N v|HST
this.everyPage = everyPage; du'`&{_/
} GzaGTd.b
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/** [%yj'
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* @return aeNbZpFQ
* Returns the hasNextPage. R#YeE`K
*/ WZHw(BN{+
publicboolean getHasNextPage(){ wA7\K~fHV
return hasNextPage; }8YY8|]LI
} kf<c[ su
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/** KkTE -$-
* @param hasNextPage a-S
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* The hasNextPage to set. x%k@&d;z
*/ ex`T9j.=B
publicvoid setHasNextPage(boolean hasNextPage){ XUVj<U
this.hasNextPage = hasNextPage; S,5>/'fy0
} "l-#v|
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/** .Mb0++% W
* @return \6MM7x(U3
* Returns the hasPrePage. ig YYkt
*/ :JX2GRL4
publicboolean getHasPrePage(){ Lj GZp"&{
return hasPrePage; hi$AZ+
} R{Zd ]HT
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/** &L+.5i
* @param hasPrePage } LC
* The hasPrePage to set. QnP3U
*/ `C|];mf(#
publicvoid setHasPrePage(boolean hasPrePage){ VoUo!t:(+
this.hasPrePage = hasPrePage; +XO\#$o>W
} VJTO:}Q
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/** "@hd\w{.
* @return Returns the totalPage. Djc-f
* <},JWV3
*/ /RqWrpzx@
publicint getTotalPage(){ JttDRNZAU
return totalPage; Xj{fM\,"9
} a9p:k
]{
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/**
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* @param totalPage >l AtfN='
* The totalPage to set. "|1iz2L
*/ 2yg6hR
publicvoid setTotalPage(int totalPage){ QM3DB
this.totalPage = totalPage; 'n-y*f
} TbNH{w|p
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}
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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 HLwMo&*rA
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个PageUtil,负责对Page对象进行构造: RfTGTz@H
java代码: ^c.D&