Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 wUV%NZB
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 =p7W^/c
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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 AMm O+E?
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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 Fh/C{cX9g
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分页支持类: plIx""a^h
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java代码: ;yXnPAtJ
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package com.javaeye.common.util; ,Z^GN%Q7a
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import java.util.List; Arv8P
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publicclass PaginationSupport { 0`thND)?O
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publicfinalstaticint PAGESIZE = 30; v;8XRR:
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privateint pageSize = PAGESIZE; +~v(*s C
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privateList items; vJ'
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privateint totalCount; .0ZvCv:>
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privateint[] indexes = newint[0]; # 0(\s@r.
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privateint startIndex = 0; OR9){qP
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public PaginationSupport(List items, int sJlKN
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totalCount){ u5_fM*Ka
setPageSize(PAGESIZE); ]>o2P cb;
setTotalCount(totalCount); k}.nH"AQ
setItems(items); 8gxLL59
setStartIndex(0); a40BisrD~6
} !/zj7z
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public PaginationSupport(List items, int hH/O2
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totalCount, int startIndex){ UXJl;Mb
setPageSize(PAGESIZE); ~-%A@Lt
setTotalCount(totalCount); QAwj]_
setItems(items); k
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setStartIndex(startIndex); :
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} 3\G=J
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public PaginationSupport(List items, int (ce NVo&
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totalCount, int pageSize, int startIndex){ xW4+)F5P(
setPageSize(pageSize); Fm':sd)'X
setTotalCount(totalCount); dFFqs&c Q
setItems(items); k]iS3+nD
setStartIndex(startIndex); ~=ktFuEa
} bYc qscW
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publicList getItems(){ 5aNDW'z`f
return items; :bDA<B6bb
} Sq,ty{j2%
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publicvoid setItems(List items){ zY+Et.lg]^
this.items = items; 3(&F.&C$$
} EYG E#C;
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publicint getPageSize(){ 9 a%@j
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return pageSize; nW_
} ~2431<YV
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publicvoid setPageSize(int pageSize){ dDbC0} x/
this.pageSize = pageSize; T7~v40jn|
} !.$P`wKr
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publicint getTotalCount(){ dCTpO
return totalCount; P0z{R[KBH
} =[+&({
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publicvoid setTotalCount(int totalCount){ u_8 22Z
if(totalCount > 0){ NGUGN~p
this.totalCount = totalCount; AHY)#|/)
int count = totalCount / ;hJ*u
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pageSize; *XOKH+_u
if(totalCount % pageSize > 0) MlE~gCD
count++; h';v'"DoW`
indexes = newint[count]; e&4u^'+K
for(int i = 0; i < count; i++){ CD[=z)<z{
indexes = pageSize *
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} ^)l@7XxD
}else{ @|Bp'`j%J
this.totalCount = 0; eE%yo3
} _|:bac8pL
} U&$]?3?
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publicint[] getIndexes(){ wR4u}gb#q
return indexes; j]O[I^5
} ix @rq#
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publicvoid setIndexes(int[] indexes){ jgw'MpQm{
this.indexes = indexes; ]?$y}
} N-YZ0/c
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publicint getStartIndex(){ !!%nl_I(
return startIndex; '|N4fbZd
} IFofFXv_
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publicvoid setStartIndex(int startIndex){ rxp9B>~
if(totalCount <= 0) 6G$tYfX
this.startIndex = 0; xH#a|iT?(
elseif(startIndex >= totalCount) RyWOiQk;
this.startIndex = indexes Yj/nzTVJ[
!DL53DQ#
[indexes.length - 1]; nY-9
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elseif(startIndex < 0) Ytwv=;h-
this.startIndex = 0; fZ:rz;tM
else{ p!QneeA`&X
this.startIndex = indexes QfWu~[
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[startIndex / pageSize]; v^_]W3K
} bvS\P!m\c
} C,vc
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publicint getNextIndex(){ "sX?wTag
int nextIndex = getStartIndex() + SJ7=<y}[d
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pageSize; ~<[5uZIo
if(nextIndex >= totalCount) KqUSTR1e[
return getStartIndex(); @/NZ>.
else DLVs>?Y
return nextIndex; Le:mMd= G
} qq3Qd,$Z
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publicint getPreviousIndex(){ zRE8299%z
int previousIndex = getStartIndex() - UA4d|^ev
4?M3#],'h
pageSize; <O)X89dFM
if(previousIndex < 0) u4M2Ec
return0; C{i;spc!bi
else #]a51Vss
return previousIndex; vek:/'sj3p
} JK]tcP
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} TIWLp
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抽象业务类 gIM'bA<~
java代码: )u )$ `a
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/** UQ?OD~7
* Created on 2005-7-12 [67E5rk-
*/ 6 %k+0\d
package com.javaeye.common.business; :`^3MMLO
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import java.io.Serializable; yO,`"Dc_0
import java.util.List; S<]a@9W
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import org.hibernate.Criteria; C9Z\G 3
import org.hibernate.HibernateException; %x8`fm
import org.hibernate.Session; <eFAI}=s
import org.hibernate.criterion.DetachedCriteria; J[Yg]6
import org.hibernate.criterion.Projections; CC(*zrOd-
import S{(p<%)[
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org.springframework.orm.hibernate3.HibernateCallback; P(gVF|J?
import :htq%gPex9
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org.springframework.orm.hibernate3.support.HibernateDaoS J1Ki2I=
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upport; ^N2M/B|0
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import com.javaeye.common.util.PaginationSupport; ,ibPSN5Ca
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public abstract class AbstractManager extends o),6o'w(
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HibernateDaoSupport { XZdr`$z f
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privateboolean cacheQueries = false; ?7nr\g"g(
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privateString queryCacheRegion; LUDJPIk
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publicvoid setCacheQueries(boolean DMcxa.Sd!
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cacheQueries){ YyJ{
this.cacheQueries = cacheQueries; Z'*Z@u3
} 7kX$wQZ_
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publicvoid setQueryCacheRegion(String #W%)$kc
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queryCacheRegion){ I`'a'
this.queryCacheRegion = ?9gTk
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queryCacheRegion; %X"m/4c8}
} E_D ^O
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publicvoid save(finalObject entity){ 0+<eRR9-
getHibernateTemplate().save(entity); 4o4 =
} 4`U0">gY
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publicvoid persist(finalObject entity){ o!toO&=
getHibernateTemplate().save(entity); ^>X)"'0+
} c@ZS|U*(
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publicvoid update(finalObject entity){ $ ~,}yh;
getHibernateTemplate().update(entity); ]C
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} bH\C5zt6(
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publicvoid delete(finalObject entity){ %`?;V;{=
getHibernateTemplate().delete(entity); Vp]D
} 9XoQO 9*Q
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publicObject load(finalClass entity, 46K&$6eN
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finalSerializable id){ W[>iJJwz
return getHibernateTemplate().load )v52y8G-p
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(entity, id); \/*Nf?;
} IObx^N_K
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publicObject get(finalClass entity, fzS`dL5,W
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finalSerializable id){ GjeUUmr
return getHibernateTemplate().get Cx+WLD
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(entity, id); ,]Ro',A&
} }{5mH:
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publicList findAll(finalClass entity){ v0Ai!#
return getHibernateTemplate().find("from iIsEQh
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" + entity.getName()); (rr}Pv%yb
} Gg9VS&VI
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publicList findByNamedQuery(finalString -Aa]aDAz68
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namedQuery){ e2k4[V
return getHibernateTemplate 79SqYe=&uy
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().findByNamedQuery(namedQuery); L\ }Pzxn
} ]am~aJ|L
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publicList findByNamedQuery(finalString query, g5[ D&
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finalObject parameter){ T~%H%O(F
return getHibernateTemplate sn-)(XU!
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().findByNamedQuery(query, parameter); g/8.W
} )RwBg8
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publicList findByNamedQuery(finalString query, v<;: 0
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finalObject[] parameters){ |e*Gz D
return getHibernateTemplate OE'K5oIM
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().findByNamedQuery(query, parameters); z wL3,!t
} A3AP51
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publicList find(finalString query){ T&r +G!2
return getHibernateTemplate().find N%9h~G
1$$37?FE
(query); {ITv&5?>
} W.A1m4l58R
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publicList find(finalString query, finalObject J3B6X 8P'
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parameter){ Z-)[1+Hs
return getHibernateTemplate().find K8?zgRG3~N
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(query, parameter); 2Co@+I[,4&
} j2|XDOf
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public PaginationSupport findPageByCriteria 5kcJ
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(final DetachedCriteria detachedCriteria){ cYGRy,'gH
return findPageByCriteria 2B7h9P.N B
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); izCaB~{/
} - $U@By<SJ
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public PaginationSupport findPageByCriteria [2Iau1<@
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(final DetachedCriteria detachedCriteria, finalint Ko#4z%Yq
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startIndex){ NuU'0_")/
return findPageByCriteria _u>t3RUA
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(detachedCriteria, PaginationSupport.PAGESIZE, _N98 vf0o
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startIndex); VS?dvZ1cC
} P:
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public PaginationSupport findPageByCriteria B4Q79gEh=
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(final DetachedCriteria detachedCriteria, finalint q"S(7xWS
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pageSize, U\Ct/U&A?
finalint startIndex){ Hk,lX r
return(PaginationSupport) j"5Pe
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getHibernateTemplate().execute(new HibernateCallback(){ J"-_{)0lD
publicObject doInHibernate R1}IeeZO?&
sltk@
(Session session)throws HibernateException { Nz~(+pVWg5
Criteria criteria = OR]T`meO
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detachedCriteria.getExecutableCriteria(session); o,CBA ;{P
int totalCount = L?!$EPr
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((Integer) criteria.setProjection(Projections.rowCount &.zj5*J
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()).uniqueResult()).intValue(); =yo{[&Jz
criteria.setProjection VBM/x|'
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(null); UR}kB&t
List items = K"L_`.&Q
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criteria.setFirstResult(startIndex).setMaxResults W6vf=I@f
lWbZ=x_0
(pageSize).list(); G]4OFz+
PaginationSupport ps = i3\~Qj;1
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new PaginationSupport(items, totalCount, pageSize, t:>x\V2m
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startIndex); 7F9;Su3.
return ps; `)$`-Pw*
} B| tzF0;c
}, true); i2*d+?Er
} V$(/0mQV(
, ;%yf?
public List findAllByCriteria(final iX%[YQ |
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DetachedCriteria detachedCriteria){ g5y;?fqJ
return(List) getHibernateTemplate JkU1daTe
r'p =`2=
().execute(new HibernateCallback(){ 7:TO\0]2n
publicObject doInHibernate B oqJ
bj}=8k0
(Session session)throws HibernateException {
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Criteria criteria = ,^ 7 CP
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detachedCriteria.getExecutableCriteria(session); <W*xshn
return criteria.list(); 4O(@'#LLz
} r,4lqar;E
}, true); OEnDsIhq
} W5.Va.
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public int getCountByCriteria(final ! RPb|1Y}+
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DetachedCriteria detachedCriteria){ \3aTaT?..
Integer count = (Integer) 7d;pvhnH
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getHibernateTemplate().execute(new HibernateCallback(){ V@%
publicObject doInHibernate \gItZ}+c4}
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(Session session)throws HibernateException { _ij$f<
Criteria criteria = EY=FDl V
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detachedCriteria.getExecutableCriteria(session); i)8N(HN
return #f*g]p{
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criteria.setProjection(Projections.rowCount ,."b3wR[w
F\:(*1C
()).uniqueResult(); ,3HcCuT
} ', {7%G9
}, true);
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return count.intValue(); (e9fm|n!)|
} +?[BU<X6u
} f8'MP9Lv
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用户在web层构造查询条件detachedCriteria,和可选的 3F+Jdr'
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 C!&y
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PaginationSupport的实例ps。 gsPl _
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ps.getItems()得到已分页好的结果集 P=`1 rjPE
ps.getIndexes()得到分页索引的数组 !tXZ%BP.u
ps.getTotalCount()得到总结果数 /(?@mnq_
ps.getStartIndex()当前分页索引
oY=1C}
ps.getNextIndex()下一页索引 3A,rHYS
ps.getPreviousIndex()上一页索引 _w(ln9
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 HjA_g0u
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 % /}WUP^H
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一下代码重构了。 #yW\5)
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我把原本我的做法也提供出来供大家讨论吧: fD4ICO @
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首先,为了实现分页查询,我封装了一个Page类: `f9gC3Hk
java代码: &aG*k*
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/*Created on 2005-4-14*/ SDYv(^ f ,
package org.flyware.util.page; 2c(aO[%h9
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/** A8DFm{})c
* @author Joa 3yA2WW
* ,v9f~qh
*/ 7N=-Y>$X
publicclass Page { z@Hp,|Vy[
[/ M`
/** imply if the page has previous page */ DmqSQA
privateboolean hasPrePage; . +
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/** imply if the page has next page */ {9LWUCpsf
privateboolean hasNextPage; Bs;|D
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/** the number of every page */ Dyg?F
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privateint everyPage; g(ogXA1
v [njdP
/** the total page number */ v~|?3/{Q
privateint totalPage; 9GLb"6+PK
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/** the number of current page */ o0It82?RN
privateint currentPage; ^tH#YlV4>9
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/** the begin index of the records by the current 1.U`D\7mb
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query */ x=Hndx^
privateint beginIndex; Q.U$nph\%d
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/** The default constructor */ I97yt[,Yy
public Page(){ s{bdl[7
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} 3)=c]@N0
u3 0s_\
/** construct the page by everyPage 28.~iw
* @param everyPage tBATZ0nK`Q
* */ Gi2$B76<
public Page(int everyPage){ q'Wr[A40j
this.everyPage = everyPage; >rsqH+oL
} !g!5_|
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/** The whole constructor */ ,XkGe
public Page(boolean hasPrePage, boolean hasNextPage, 5ETip'<KT6
#/2$+x
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int everyPage, int totalPage, XFVV},V
int currentPage, int beginIndex){ n(seNp%_
this.hasPrePage = hasPrePage; c]-*P7W
this.hasNextPage = hasNextPage; )!BsF'uVQ
this.everyPage = everyPage; SQ*k =4*r
this.totalPage = totalPage; 4LH[4Yj?`
this.currentPage = currentPage; e4>"92hX
this.beginIndex = beginIndex; \55VqGyxu9
} <^?1uzxH8A
.
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/** -_C#wtC
* @return An*~-u9m
* Returns the beginIndex. PxS4,`#~
*/ 8I;XS14Q
publicint getBeginIndex(){ u"1rF^j6k
return beginIndex; s*/ bi
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} yS(}:'`r
!~]<$WZV
/** nrm+z"7
* @param beginIndex q#w8wH"
* The beginIndex to set. gKz(=
*/ $d S@y+
publicvoid setBeginIndex(int beginIndex){ zq+o+o>xo
this.beginIndex = beginIndex; u9+kLepOT
} uj>WgU
g-c ;}qz
/** 0+Ta%H{
* @return mm[2wfTE
* Returns the currentPage. %p^.|Me7
*/ 'H5M|c$s
publicint getCurrentPage(){ WY^W.1X
return currentPage; t\P<X^d%
} *Xo]-cKL0
(+uj1z^
/** tGA :[SP
* @param currentPage !-`Cp3gqHr
* The currentPage to set. Wq*b~Lw
*/ m7EcnQf
publicvoid setCurrentPage(int currentPage){ D8&`R
this.currentPage = currentPage; ,Ys"W x
} 3pf[M{dG
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/** y[B>~m8$
* @return HK\~Qnq
* Returns the everyPage. ~'37`)]z
*/ =K'cM=WM6
publicint getEveryPage(){ QrO\jAZ{Ag
return everyPage; cdqB,]"
} X\EVTd)@
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/** qTZFPfyU
* @param everyPage n
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* The everyPage to set. su*Pk|6%
*/ 'lHdOG
publicvoid setEveryPage(int everyPage){ (=D&A<YX
this.everyPage = everyPage; s .Wdxh
} gs!(;N\j|
w 4[{2
/** oh#\]c\f
* @return 8-<:i
* Returns the hasNextPage. "-@[R
*/ 4_Dp+^JF
publicboolean getHasNextPage(){ `u>4\sv
return hasNextPage; {*{Ox[Nh{
} Eu"_MgD
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/** U9b?i$
* @param hasNextPage .bBdQpF-
* The hasNextPage to set. WAdCF-S
*/ 4pw6bK,s2\
publicvoid setHasNextPage(boolean hasNextPage){ q6YX M
this.hasNextPage = hasNextPage; )K &(
} MSf;ZB
;M"9$M'
/** 9tF9T\jW
* @return ;a:[8 Yi
* Returns the hasPrePage. LL:_L<
*/ 2UGsYQn
publicboolean getHasPrePage(){ 4apL4E"r
return hasPrePage; D!7`CH+
} !K|5bK
jy-{~xdg[
/** )"Ztlhs`#
* @param hasPrePage d!eYqM7-G
* The hasPrePage to set. x.S3Zi}=
*/ M4as
publicvoid setHasPrePage(boolean hasPrePage){ f^W;A"+
this.hasPrePage = hasPrePage; &b:1I7Cp*
} 98^V4maR:
t!RiU ZAo
/** !47n[Zs
* @return Returns the totalPage. #%DE;
* s[UHe{^T
*/ / m=HG^!
publicint getTotalPage(){ -'6Dg
return totalPage; yPq'( PV
} AK@9?_D
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/** | Bi!
* @param totalPage G^ :C+/)
* The totalPage to set. HTG%t/S
*/ ti
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publicvoid setTotalPage(int totalPage){ }_ 9Cxji
this.totalPage = totalPage; ob8qe,_'
} !KUi\yQ1
#\=F O>
} yqPdl1{Qr=
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} }59V&'t
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 <7~'; K
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个PageUtil,负责对Page对象进行构造: nrjE.+v
java代码: a|X a3E
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v/ _
/*Created on 2005-4-14*/ Hm*/C4B`
package org.flyware.util.page; \kZ?
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import org.apache.commons.logging.Log; jnn}V~L
import org.apache.commons.logging.LogFactory; W)bLSL]`E
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/** {tWf
* @author Joa -qGa]a
* > ;*b|Ik
*/ {z{bY\
publicclass PageUtil { nlc
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privatestaticfinal Log logger = LogFactory.getLog x<ZJb
aht[4(XH5
(PageUtil.class); BI%$c~wS
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/** GB=X5<;
* Use the origin page to create a new page LU!a'H'Q
* @param page vQ
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* @param totalRecords xA$XT[D
* @return cPlZXf
*/ ]Gsv0Xk1
publicstatic Page createPage(Page page, int
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fumm<:<CLO
totalRecords){ 50S&m+4d+
return createPage(page.getEveryPage(), _z|65H
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page.getCurrentPage(), totalRecords); <<][hQs
} |IzPgC
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/** ;@oN s-
* the basic page utils not including exception YIG~MP
xqu}cz
handler K &N
* @param everyPage (5-FV p
fb
* @param currentPage 3EPv"f^V
* @param totalRecords ]>5/PD,wWy
* @return page sYI-5D]
*/ H&