Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Vj{}cL"MR
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 m"RE[dQ
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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 Wy.Xx-3W
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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 #m<<]L(o8W
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。 ^S'tMT_
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分页支持类: t4E=
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java代码: baVSQtda
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package com.javaeye.common.util; d3| oKP6
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import java.util.List; I N'a5&..
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publicclass PaginationSupport { {Z=m5Dy}
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publicfinalstaticint PAGESIZE = 30; 6W abw:
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privateint pageSize = PAGESIZE; '9#O#I&J
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privateList items; P5*~Wi`
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privateint totalCount; eHjn<@
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privateint[] indexes = newint[0]; D/&^Y'|T
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privateint startIndex = 0; NHCdf*
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public PaginationSupport(List items, int d* 6 lJT
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totalCount){ @!:~gQ
setPageSize(PAGESIZE); $`emP
Hel
setTotalCount(totalCount); ?(^HjRUY
setItems(items); x{X(Y]*1S
setStartIndex(0); lc71Pp>
} %dMP}k/
. .|>|X4
public PaginationSupport(List items, int KnC;j-j
exqFwmhh
totalCount, int startIndex){ HCI|6{k
setPageSize(PAGESIZE); KKd Sh1
setTotalCount(totalCount); Qv%"iSe~J
setItems(items); E-\<,=bh
setStartIndex(startIndex); 3YG[~o|4
} 4X@
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V^P]QQ\
)
public PaginationSupport(List items, int 3+_
.I{
v:Av2y
totalCount, int pageSize, int startIndex){ @,<@y>m7
setPageSize(pageSize); f;C*J1y
setTotalCount(totalCount); cViEvS r
setItems(items); |=^p`CT
setStartIndex(startIndex); )")_aA
} Lbka*@
UJXRL
publicList getItems(){ 3iHUG^sLW
return items; G6C#M-S
} $r`^8/Mq3
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publicvoid setItems(List items){
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this.items = items; v`"z
} +rw?k/
qn VxP&
publicint getPageSize(){ .Vm!Ng )j
return pageSize; .5ap9li]
} uES|jU{]b
N02X*NC
publicvoid setPageSize(int pageSize){ 8E:8iNbF
this.pageSize = pageSize; tiZ5
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} QxRT%;'Zh]
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publicint getTotalCount(){ ?v4-<ewD
return totalCount; 9 )1 8
} eSNwAExm
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publicvoid setTotalCount(int totalCount){ x;&01@m.
if(totalCount > 0){ !}Sf?nP#
this.totalCount = totalCount; v=kQ/h
int count = totalCount / p^|IN'lx,
f}JiYZ
pageSize; Zl5cHejM
if(totalCount % pageSize > 0) A>@ i
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count++; d"K~+<V}
indexes = newint[count]; 8$k `bZ
for(int i = 0; i < count; i++){ `mar-r_m
indexes = pageSize * ~=$0=)c
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i; Y$3 &?LA
} toDv~v
}else{ [{]/9E/&
this.totalCount = 0; i3bH^WwE&k
} X$aN:!1
} h<)YZ[;x
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publicint[] getIndexes(){ b-Q*!Ut
return indexes;
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} =L,s6J8_'
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publicvoid setIndexes(int[] indexes){ !GB\-(
this.indexes = indexes; +m|S7yr'
} J7Z`wjX1
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publicint getStartIndex(){ uY{zZ4iw
return startIndex; DhN{Y8'~
} ,8=`Y9#
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publicvoid setStartIndex(int startIndex){ 1(S0hm[ov
if(totalCount <= 0) 6Z09)}tZb
this.startIndex = 0; xEW>7}+\
elseif(startIndex >= totalCount) &hTe-Es
this.startIndex = indexes DdUT"%
S511}KPbm/
[indexes.length - 1]; Sz!mn
elseif(startIndex < 0) ,]A|z ~q
this.startIndex = 0; )4nf={iM
else{ _/FpmnaY
this.startIndex = indexes .A(QqL>
??\1eo2gB
[startIndex / pageSize]; 54X=58Q
} \nfjz\"R?b
} h/'b(9fS
c@eQSy
publicint getNextIndex(){ QcW6o,
int nextIndex = getStartIndex() + uPe&i5YR
s5`CV$bz
pageSize; }PC_qQF
if(nextIndex >= totalCount) I_?+;<n
return getStartIndex(); U?@ s`.
else $-J0ou8~
return nextIndex; Yz%A Kp
} B=?m_4\$m
hg2a,EU\Z
publicint getPreviousIndex(){ 9Dat
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int previousIndex = getStartIndex() - 2F}D?]A
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pageSize; OON]E3yy
if(previousIndex < 0) oouhP1py,
return0; 8;%F-?
else QPD[uJ(I
return previousIndex; !iNN6-v%
} ;h f{B7
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} zl]Ic' _i
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抽象业务类 ' ?4\
java代码: =qJlSb
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/** pu"m(9
* Created on 2005-7-12 _c z$w5`
*/ <MQTOz
oj
package com.javaeye.common.business; F.Sc2n@7-
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import java.io.Serializable; y/.I<5+Bu
import java.util.List; j}`XF?2D
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import org.hibernate.Criteria; J<vVsz+7:
import org.hibernate.HibernateException; zObrp
import org.hibernate.Session; w/oXFs&FK
import org.hibernate.criterion.DetachedCriteria; -"CXBKHb
import org.hibernate.criterion.Projections; n40&4n
import n>XfXt =
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org.springframework.orm.hibernate3.HibernateCallback; [uLpm*7
import o>l/*i0I
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org.springframework.orm.hibernate3.support.HibernateDaoS p Lwtm@
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upport; xbNL <3"a
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import com.javaeye.common.util.PaginationSupport; +HSKFp
v.!e1ke8D*
public abstract class AbstractManager extends n8.Tag(#
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HibernateDaoSupport { S\S31pYT
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privateboolean cacheQueries = false; #zed8I:w
W @]t
privateString queryCacheRegion; C@P*:L_
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publicvoid setCacheQueries(boolean IJk<1T7:(W
ws([bS2h
cacheQueries){ ?m\?
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this.cacheQueries = cacheQueries; {%BPP{OFk
} o^3X5})sv
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publicvoid setQueryCacheRegion(String "KKw\i
j2`%sBo
queryCacheRegion){ s?7"iE
this.queryCacheRegion = 3y}8|ML
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queryCacheRegion; r:U/a=V
} ~[Z,:=z
:;URLl0
publicvoid save(finalObject entity){ il[waUfmD
getHibernateTemplate().save(entity); @ruWnwb
} y1bo28
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publicvoid persist(finalObject entity){ V)Ze>Pp
getHibernateTemplate().save(entity); Zo#c[9IaC
} 62 9g_P)
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publicvoid update(finalObject entity){ 7{Zs"d{s
getHibernateTemplate().update(entity); .W51Cup@&
} &R,QJ4L
)ml#2XP!f
publicvoid delete(finalObject entity){ OV/
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getHibernateTemplate().delete(entity); Wg=q lux-
} \ch4c9
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publicObject load(finalClass entity, qkA8q@Y4|
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finalSerializable id){ (g3DI*Z
return getHibernateTemplate().load }$` PZUw>
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(entity, id); VK%
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} yJ*g ;
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publicObject get(finalClass entity, |w.h97fj
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finalSerializable id){ oC}2 Z{
return getHibernateTemplate().get Ao, <G.>R
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(entity, id); 3/Dis)
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} 4ah5}9{g
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publicList findAll(finalClass entity){ vlo!D9zsV3
return getHibernateTemplate().find("from =%d.wH?dZ/
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" + entity.getName()); (!% w
} xTy)qN]P
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publicList findByNamedQuery(finalString 3 (F+\4aRm
XnB-1{a1
namedQuery){ ]3d5kf
return getHibernateTemplate fv:&?gc
W)Mc$`nX
().findByNamedQuery(namedQuery); zYEb#*Kar
} GpCjoNcW{
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publicList findByNamedQuery(finalString query, A5~OHmeK
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finalObject parameter){ G|j8iV O
return getHibernateTemplate V U~r~
OBf$0
().findByNamedQuery(query, parameter); }'4aW_ta
} $1n\jN
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publicList findByNamedQuery(finalString query, -Xt0=3,
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finalObject[] parameters){ f\~A72-
return getHibernateTemplate vP^V3
v\R-G
().findByNamedQuery(query, parameters); Hd{@e6S
} ZdlQ}l#F
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publicList find(finalString query){ is`~C
return getHibernateTemplate().find
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trM)&aQto
(query); og8"#%
} !l~3K(&4
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publicList find(finalString query, finalObject Zksow} %
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parameter){ A:,R.P>`C
return getHibernateTemplate().find *sq+ Vc(
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(query, parameter); K]yUPx
}
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public PaginationSupport findPageByCriteria x*0mmlCb
BnIZ+fg=
(final DetachedCriteria detachedCriteria){ 0j2M< W#
return findPageByCriteria lv\^@9r
]M/*Beh
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 6|ENDd[
} l&6+ykQ
tk'3Q 1L
public PaginationSupport findPageByCriteria }d 16xp
0A.9<&Lod
(final DetachedCriteria detachedCriteria, finalint o3>D~9
E?F?)!%
startIndex){ T``~YoIdz
return findPageByCriteria -mqTlXM
3R ZD=`
(detachedCriteria, PaginationSupport.PAGESIZE, 7A46?kfu
i`" L?3T
startIndex); yMBFw:/o
} (Q ~<>
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public PaginationSupport findPageByCriteria 6D1tRo
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(final DetachedCriteria detachedCriteria, finalint 'tun;Y
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pageSize, <!I^ xo[
finalint startIndex){ dJUI.!hv;
return(PaginationSupport) `&qeSEs\
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getHibernateTemplate().execute(new HibernateCallback(){ c9axzg
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publicObject doInHibernate N1jJ(}{3
,)P6fa/
(Session session)throws HibernateException { K 6HH_T
Criteria criteria = =B tmi
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detachedCriteria.getExecutableCriteria(session); \C;F5AO
int totalCount = "uHU!)J#z
6sl2vHzA
((Integer) criteria.setProjection(Projections.rowCount =1h> N/VJ
Y<9Lqc.i
()).uniqueResult()).intValue(); 4z^5|$?_ta
criteria.setProjection xgv&M:%D-
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(null);
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List items = -
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iXFN|ml
criteria.setFirstResult(startIndex).setMaxResults p/.[cH
AcxC$uh
(pageSize).list(); TrmU
PaginationSupport ps = _0=$ 2Y^
zHW}A
`Rz
new PaginationSupport(items, totalCount, pageSize, ,.PmH.zjmR
?ZlN$h^
startIndex); R|O."&CAB
return ps; PvB-Cqc
} L(i0d[F
}, true); JBvP {5
} Z*Jp?[##
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public List findAllByCriteria(final sH{4 .tw
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DetachedCriteria detachedCriteria){ ;c~%:|
return(List) getHibernateTemplate fN{JLp
V(
bU=;Qo
().execute(new HibernateCallback(){ R7-+@
publicObject doInHibernate vqnFyd
tA6x
(Session session)throws HibernateException { @$%[D`Wa<
Criteria criteria = Zi~-m]9U
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detachedCriteria.getExecutableCriteria(session); n8vteGQ
return criteria.list(); p:q?8+W-r
} $Hbd:1%i
{
}, true); VA0p1AD
} [^GXHE=
XZ!^kftyW
public int getCountByCriteria(final ,zU7U L^I
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DetachedCriteria detachedCriteria){ sFWH*kdP?
Integer count = (Integer) ,I|Tj C5
t+`>zux5(T
getHibernateTemplate().execute(new HibernateCallback(){ @2Ca]2,4
publicObject doInHibernate ]^
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(Session session)throws HibernateException { 64h$sC0z/e
Criteria criteria = }iCcXZ&5^
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detachedCriteria.getExecutableCriteria(session); ~G*eJc0S:
return !K319 eE
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criteria.setProjection(Projections.rowCount Bfz]PN78.G
h|S6LgB
()).uniqueResult(); _/
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} ($A0umW1%
}, true);
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return count.intValue(); G0VbW-`O
} _ZU.;0
} #+]-}v3
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m? #J`?E
用户在web层构造查询条件detachedCriteria,和可选的 ?IHa>f:
MY `V0
startIndex,调用业务bean的相应findByCriteria方法,返回一个 JK@"
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PaginationSupport的实例ps。 R"
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ps.getItems()得到已分页好的结果集 7y2-8eL
ps.getIndexes()得到分页索引的数组 (<:mCPk(~
ps.getTotalCount()得到总结果数 k%S;N{Qh@
ps.getStartIndex()当前分页索引 K4>nBvZ?v
ps.getNextIndex()下一页索引 >4N=P0=
ps.getPreviousIndex()上一页索引 _wM YA8n
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 3"XS#~l%
",&c"r4c
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 g=)djXW
]fgYO+
一下代码重构了。 h-`*S&mZ
d/4k F
我把原本我的做法也提供出来供大家讨论吧: lp=8RbQYC
(#"iZv,
首先,为了实现分页查询,我封装了一个Page类: ID1/N)56
java代码: uY~xHV_-
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/*Created on 2005-4-14*/
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package org.flyware.util.page; OY>0qj
'K0=FPB/@
/** UPI'O %
* @author Joa D^%DYp
*
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*/ !e"TWO*X
publicclass Page { QTNE.n<?
O%n =n3
/** imply if the page has previous page */ cA8"Ft{P)
privateboolean hasPrePage; HLnizE
(2vf
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/** imply if the page has next page */ lx!9KQAM*
privateboolean hasNextPage; c[xH:$G?Y
Ao/KB_4f*Q
/** the number of every page */ aAX(M=3
privateint everyPage; (GNY::3
R#QcQx
/** the total page number */ WO=,NQOw
privateint totalPage; i[wEH1jR
;.g <u
/** the number of current page */ 4Nx]*\\
privateint currentPage; `vijd(a?v
~Uet)y<
/** the begin index of the records by the current oy)'wb~
a.5^zq7#!
query */ ZTwCFn
privateint beginIndex; NpIx\\d
^:c"%<"='
D`G ;kp
/** The default constructor */ XtV=Gr8"
public Page(){ ]1XJQW@gF
H)${"
} IO4 8sV }
< x==T4n/
/** construct the page by everyPage 34$qV{Y%y
* @param everyPage Lb>UraUvL
* */ $M(ZKS3,j
public Page(int everyPage){ R3dCw:\O+Z
this.everyPage = everyPage; %HNe"7gk
} 6_w;dnVA
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/** The whole constructor */ q ["T6
public Page(boolean hasPrePage, boolean hasNextPage, ~/B[;#
0y"Ra%Y
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int everyPage, int totalPage, v_zVhEtY
int currentPage, int beginIndex){ +$YluGEJ
this.hasPrePage = hasPrePage; #(5hV7i
this.hasNextPage = hasNextPage; P}El#y#&
this.everyPage = everyPage; e I 6G
this.totalPage = totalPage; qrj:H4#VB
this.currentPage = currentPage; Ak\w)!?s
this.beginIndex = beginIndex; ]qLro<
} ua^gG3n0
{'QA0K
/** #z*-
* @return Z\`i~
* Returns the beginIndex. ;U^7]JO;
*/ abVz/R/o
publicint getBeginIndex(){ Y`x54_32
return beginIndex; f[bx|6
} e"sz jY~V
c-2##Pf_8O
/** K`25G_Y3@
* @param beginIndex X R =^zp?
* The beginIndex to set. yE \dv)(<
*/ >c~Fgs
publicvoid setBeginIndex(int beginIndex){ `oxs;;P
this.beginIndex = beginIndex; #SzCd&hI
} U# jbii6e
d`_X$P4y
/** wjr1?c
* @return "t{|e6
* Returns the currentPage. fgg;WXcT ~
*/ -<'&"-
publicint getCurrentPage(){ >4zH\T!
return currentPage; #_,
l7q8U
} $YmD;
nEZoF
/** 1i.t^PY
* @param currentPage } h.]sF
* The currentPage to set. "Zh6j)[o
*/ c&Mci"nj0
publicvoid setCurrentPage(int currentPage){ Iaq7<$XU
this.currentPage = currentPage; k lRS:\dW
} K'`N(WiL
Dt9[uyP&
/** azj:Hru&t#
* @return xlqh,?'>W
* Returns the everyPage. p.gaw16}>
*/ gX}(6RP_!
publicint getEveryPage(){ -L&FguoVB
return everyPage; U-P\F-
} gUoL8~
j&G*$/lTO6
/** FE)L?
* @param everyPage (5SN=6O
* The everyPage to set. G|Du/XYh
*/ *o/Q#
publicvoid setEveryPage(int everyPage){ 0<{+M` G/
this.everyPage = everyPage; A&$oiLc
} `g;`yJX<
H)s$0Xd
/** L
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* @return 8H>: C(h
* Returns the hasNextPage. _VeZlk7k
*/ Kw%n;GFl'
publicboolean getHasNextPage(){ Hw1<!Dyv
return hasNextPage; a8#6}`|C?
} Ol,Tw=?
qc*z`Wz:
/** SWX;sM
* @param hasNextPage 9`/\|t|V
* The hasNextPage to set. ^<0azza/(
*/ m17H#!`
publicvoid setHasNextPage(boolean hasNextPage){ {%S>!RA
this.hasNextPage = hasNextPage; "g)@jqq:>
} 2BU%4IG
6$}hb|j
/** y%X{[F
* @return ?(cbZ#( o
* Returns the hasPrePage. <bPn<QI
*/ @
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publicboolean getHasPrePage(){ pZu2[
return hasPrePage; pq"3)+3:
} ,qj
!+?,y/*5(
/** ,FvBZ.4c3=
* @param hasPrePage :
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* The hasPrePage to set. .c[v /SB]
*/ hhTM-D1Ehs
publicvoid setHasPrePage(boolean hasPrePage){ r@_`ob RW;
this.hasPrePage = hasPrePage; aj1o
} >Lh+(M;+F
F[Dhj,C"
/** k!gft'iU
* @return Returns the totalPage. ,[To)x5o
* a *n^(
*/ \}0J%F1
publicint getTotalPage(){ L{K:XiPn
return totalPage; {2`:7U~|
} 1M|DaAI
Fm@G@W7,m
/** :%M[|Fj
* @param totalPage O.n pi: a
* The totalPage to set. yq{k:)
*/ QGtKu:c.81
publicvoid setTotalPage(int totalPage){
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this.totalPage = totalPage; RCED
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} #tyHj k
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} 2;@#i*\Y
7-nz'-'
3,@I`
M
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. Q3GA0O
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 i^[yGXtW
,Db+c3
个PageUtil,负责对Page对象进行构造: ,t4g^67R{
java代码: Sri,sZv
y*,3P0*z
<<@vy{*Hg
/*Created on 2005-4-14*/ eMPkk=V
package org.flyware.util.page; gl/n*s#r_
*5$$C&@o9
import org.apache.commons.logging.Log; S ^?&a5{o
import org.apache.commons.logging.LogFactory; _ri1RK,
;~Eb Q
/** nwlo,[
* @author Joa Y[=Gv6Fr
* S/j~1q_|G
*/ 8U8l
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publicclass PageUtil { |];s[^$#
$9v:(:!Bm
privatestaticfinal Log logger = LogFactory.getLog y6|&bJ @
T<*i($
[
(PageUtil.class); ~Uw**PT3M
(>*<<a22
/** JO:40V?op
* Use the origin page to create a new page k^3|A3A
* @param page `3!ERQU
* @param totalRecords 9QaEUy*,
* @return ,Mf@I5?
*/ [gZd$9a
publicstatic Page createPage(Page page, int 9Ny{2m=Ye
\~4uEk"]
totalRecords){ g:/l5~b
return createPage(page.getEveryPage(), `A5^D
V\8vJ3.YV
page.getCurrentPage(), totalRecords); o<f[K}t9
} ' bio:1
\ /C-e
/** @`<v d@
* the basic page utils not including exception Ea@N:t?(8=
ShAI6j
handler WDr'w'
* @param everyPage ^Z7])arA
* @param currentPage ^7C?yC
* @param totalRecords 0Y#S2ty
* @return page ?pdvFM
*/ 7bioLE
publicstatic Page createPage(int everyPage, int Ug=8:a(U.
t?p[w&@M2
currentPage, int totalRecords){ M9{?gM9
everyPage = getEveryPage(everyPage); b?-Ep?G'\
currentPage = getCurrentPage(currentPage); )>q.!"B
int beginIndex = getBeginIndex(everyPage, 7_ g}t!b`
8=x{>&Jr
currentPage); D T^3K5
int totalPage = getTotalPage(everyPage, oXG,8NOdC
%of#VSk
totalRecords); "J(#|v0
boolean hasNextPage = hasNextPage(currentPage, L*tn>AO
mBgMu@zt)
totalPage); }PGl8F !
boolean hasPrePage = hasPrePage(currentPage); D\8 ~3S'd
:(EU\yCzK
returnnew Page(hasPrePage, hasNextPage, `INcZr"
everyPage, totalPage, |V{'W-`
|[
currentPage, 2ul!f7#E
7-81,ADv(
beginIndex); :70cOt~Z
} -fu=RR
SesJg~8
privatestaticint getEveryPage(int everyPage){ n0#HPI"
return everyPage == 0 ? 10 : everyPage; ot P7;l
} *Got
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privatestaticint getCurrentPage(int currentPage){ j;eR9jI$T
return currentPage == 0 ? 1 : currentPage; [i24$UT
} $aTZC>R
/7X:=~m
privatestaticint getBeginIndex(int everyPage, int CN0&uyu#4
/!,>P[Vx
currentPage){ /)?]vKMiI
return(currentPage - 1) * everyPage; ('!90
} &G?b|Tb2
?1 $.^
privatestaticint getTotalPage(int everyPage, int @qH{;
H"f%\'
totalRecords){ ?g2Wu0<
int totalPage = 0; Gc}d#oo*k
aloP@U/\Sn
if(totalRecords % everyPage == 0) D^P_3
B+
totalPage = totalRecords / everyPage; w~sr2;rp<
else PNgj 8J4
totalPage = totalRecords / everyPage + 1 ; ZiodJ"r
X<J
NwjM%
return totalPage; FQSepUl
} vsg"!y@v
4;8
Z?.
privatestaticboolean hasPrePage(int currentPage){ C#X|U2$
return currentPage == 1 ? false : true; =if5$jE3
} k0.|%0?K
TGu`r>N51
privatestaticboolean hasNextPage(int currentPage, W@jBX{k
zZDa71>
int totalPage){ <T JUKznO
return currentPage == totalPage || totalPage == \M1-
aB~?Y+m
0 ? false : true; ;,n{6`
} H
`Fe|6I&
9r%O
<e|I?zI9-
} {Cnz7TVB
-sl]
funRy
7u-o7#,X2
!Q=H)\3
# (B <n
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 GQO}E@W6C
rWEJCFa
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 ~=i9]%g?
~7T]l1]W%
做法如下: VqLqj$P
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 ;_),?(
LDHuf<`
的信息,和一个结果集List: B'B,,Mz
java代码: FS30RP3
`/
%g}ri8
fQq'_q5
/*Created on 2005-6-13*/
?"[b408-
package com.adt.bo; P#bZtWx'<N
Jw?J(ig^
import java.util.List; 85YE6^y
UOy9N
import org.flyware.util.page.Page; '+^HeM^;
<7cm[
/** !lp*0h(7
* @author Joa U=MFNp+
*/ N=lFf+
publicclass Result { |]sh*<:?,
GZQy~Uk~
private Page page; w N9I )hB
BXyg ?
private List content; _U;z@
>p Y0f }
/** 9m MPkgc
* The default constructor ^2}0lP|
*/ H->J.5~,K
public Result(){ DYkNP:+
super(); `Xvrf
} [f,; +Ze
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n j-
/** 8.bIP
ju%v
* The constructor using fields W>+\A"
* >.N?y@
* @param page XhjH68S(
* @param content cLn&b}8'
*/ IY2caXu
public Result(Page page, List content){
+T02AS
this.page = page; ^=@L(;Y
this.content = content; M \rW
} Kf#9-.}?
ys|a ^VnN
/** <z+5+h|^
* @return Returns the content. ).e_iE[&
*/ \?A 7{IY
publicList getContent(){ XOK.E&eilj
return content; Q[J%
} Lgl%fO/<t
e>\[OwF-x
/** uuW._$.A>
* @return Returns the page. `+cc{k
*/ 0w}OE8uq
public Page getPage(){ ]wCg'EUB
return page; f]N2(eM
} kKwb)i
/iFtW#K+
/** 8TIc;'bRM
* @param content VuZd
* The content to set. (;-<
@~2
*/ 2.6%?E]
public void setContent(List content){ H$Om{r1j
this.content = content; gSS2)Sd}
} 'B0=
"7
5> M6lwS
/** ~ {OBRC
* @param page WZ`u"t^2V
* The page to set. M:i;;)cq
*/ swEE >=
publicvoid setPage(Page page){ QyN<o{\FD!
this.page = page; <Uf?7
} ^"N]i`dIF
} 7jP
C{W
c+P.o.k;
W,'30:#Fr7
H|&[,&M>
w3oh8NRs_
2. 编写业务逻辑接口,并实现它(UserManager, cC@B\Q
k4Ed 7T-
UserManagerImpl) <RQ\nU
java代码: H<bYm]a%
jt9fcw
*m$P17/C
/*Created on 2005-7-15*/ H]2cw{2
package com.adt.service; Q@zD'G>
ha_&U@w
import net.sf.hibernate.HibernateException; #_)<~
QEo
i9@3
import org.flyware.util.page.Page; ?QuD:vck
. AJ(nJ)
import com.adt.bo.Result; uEqL Dg
NVqJN$z
/** ^5n"L29V
* @author Joa 3Q'Q %2
*/ Te&F2`vo
publicinterface UserManager { fHK`u'
#qqIOjS^w
public Result listUser(Page page)throws I6!~(ND7
M}Sn$h_
HibernateException; {uVvo=3
l!z)gto
} ~wtl\-cY
iK&s_}i:
M'gw-^(
A#/O~-O^
);-?~
java代码: AG?cI@',
?J[m)Uo/K
"_!D
b&AH
/*Created on 2005-7-15*/ Q7uhz5oZ
package com.adt.service.impl; BC|=-^(
P_Rh& gkuK
import java.util.List; `<}Q4p
k0[b4cr`
import net.sf.hibernate.HibernateException; 'vbrzI5m
$,Q0ay
import org.flyware.util.page.Page; Vu6$84>-,
import org.flyware.util.page.PageUtil; A{3VTe4TV
c;X8:Z=ja
import com.adt.bo.Result; O"%b@$p\L
import com.adt.dao.UserDAO; .;),e#
import com.adt.exception.ObjectNotFoundException; ']]Czze
import com.adt.service.UserManager; ,|:TML
`v;9!ReZV
/** ,ddoII
* @author Joa ;h|zNx0
*/ Yi?X|"\`
publicclass UserManagerImpl implements UserManager { > J4Tk1//b
([vyY}43h
private UserDAO userDAO; \q2:1X|
@D$^-
S6
/** Tvdg:[V<
* @param userDAO The userDAO to set. s
@AGU/v
*/ [diUO1p
publicvoid setUserDAO(UserDAO userDAO){ dY|~"6d)
this.userDAO = userDAO; HP/f`8
} 'IVNqfC)u
.K
I6<k/
/* (non-Javadoc) "}"hQ.kAz
* @see com.adt.service.UserManager#listUser [w>T.b
]yg3|C;
(org.flyware.util.page.Page) OPi><8x
*/ 2L\}
public Result listUser(Page page)throws Nu}x`Qkmr
G3[X.%g`
HibernateException, ObjectNotFoundException { v@_^h}h/,=
int totalRecords = userDAO.getUserCount(); AcRrk
if(totalRecords == 0) G3Z>,"w;=
throw new ObjectNotFoundException BC*)@=7fx
;^fGQ]`4
("userNotExist"); j.}@ 9
page = PageUtil.createPage(page, totalRecords); |_fmbG
List users = userDAO.getUserByPage(page); hrT!S
returnnew Result(page, users); 'aj97b;lpG
} mI$<+S1!
"#<P--E 9
} #RfNk;kaA
cJp:0'd
ZeB"k)FI>
WD`z\{hcom
45?aV@
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 'r/+za:2
]6)~Sj$ 5
询,接下来编写UserDAO的代码: WR5@S&fU`
3. UserDAO 和 UserDAOImpl: $9~6M*
java代码: H YA<
_BC%98:WP
Ln&'5D#
/*Created on 2005-7-15*/ )\xDo<@
package com.adt.dao; >0^oC[ B
\:7G1_o
import java.util.List; n:TWZ.9
-MA/:EB
import org.flyware.util.page.Page; 9V ]{q
Vn7FbaO^
import net.sf.hibernate.HibernateException; E2hy%y9Tp
NA=I7I@
/** !PAuMj)P
* @author Joa d3,%Z &
*/ ~tw#Q
publicinterface UserDAO extends BaseDAO { |8m2i1XG
ca@?-)
publicList getUserByName(String name)throws 8ch^e[U`
O6
:GE'S
HibernateException; lMn1e6~K
h vC gd^M
publicint getUserCount()throws HibernateException; KR49Y>s<
d9qA\ [
publicList getUserByPage(Page page)throws cPx]:sC
s|cL
mL[
HibernateException; k'(d$;Jgr
&"_5?7_N
} {jK:hQX
;$il_xA)\>
aAT!$0H
47/14rY
2
+VE]
.*T
java代码: {/u}
Q;h6F{i
vV( ?A
/*Created on 2005-7-15*/ }=7?
&
b
package com.adt.dao.impl; 2:8p>^g=
SJ
ay
import java.util.List; t_Q\uo}
~_XK<}SK
import org.flyware.util.page.Page; h?D>Dfeg%
$vC}Fq
import net.sf.hibernate.HibernateException; &/\Q 6$a
import net.sf.hibernate.Query; l-mt{2
1xf
Pe#
import com.adt.dao.UserDAO; )XFaVkQ}
be->ofUYgs
/** $FJf8u`
* @author Joa
<< XWL:
*/ 9ZYT#h
public class UserDAOImpl extends BaseDAOHibernateImpl ntZl(] l
Y8s.Q
implements UserDAO { K{vn[}
bE6:pGr
/* (non-Javadoc) W Z_yaG$U
* @see com.adt.dao.UserDAO#getUserByName &{gD(QG
l(B(gPvU
(java.lang.String) ab@1JAgs
*/ VhfMj|
publicList getUserByName(String name)throws +[lv
`tr
uE;bNs'
HibernateException { o<\uHr3
String querySentence = "FROM user in class ua8Burl7
DI)!x {"
com.adt.po.User WHERE user.name=:name"; t
;-U
Query query = getSession().createQuery X<8
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(querySentence); O]1aez[
query.setParameter("name", name); E3~ Wyfd7
return query.list(); x("V+y*
} 1SwKd*aRR?
phc9esz
/* (non-Javadoc) JNx;/6'd,
* @see com.adt.dao.UserDAO#getUserCount() qX%oLa
*/ ->u}b?aF
publicint getUserCount()throws HibernateException { c H7Gb|,M
int count = 0; yh'uH
String querySentence = "SELECT count(*) FROM G.B~n>}JU,
Lk>GEi|
user in class com.adt.po.User"; r9vO(m~
Query query = getSession().createQuery "<Q,|Md
4?c4GT9(6S
(querySentence); oNFvRb2Rd
count = ((Integer)query.iterate().next 4UISuYg'
G@=H='
:~
()).intValue(); 3[UB3F4K
return count; Qw@_.I
} u|Tg*B
ZR*Dl.GWY
/* (non-Javadoc) ,?KN;~t#vz
* @see com.adt.dao.UserDAO#getUserByPage +>BD^[^^
6qF9+r&e?
(org.flyware.util.page.Page) '<!T'l:R:/
*/ wj$WE3Y
publicList getUserByPage(Page page)throws 4COo ~d
hVl^vw7o
HibernateException { gc[BP>tl\
String querySentence = "FROM user in class =}xH6^It
py':UQS*q
com.adt.po.User";
?}Y;/Lwx
Query query = getSession().createQuery CYHo~VIK
Ni
Y.OwKr
(querySentence); Kd|@
query.setFirstResult(page.getBeginIndex()) o'*7I|7a
.setMaxResults(page.getEveryPage()); &~&nJr
return query.list(); ?rSm6V
} Pq<]`9/w^w
i!7|YAu
} jT $
8;q2W
F{AX
Y$K[@_dv=
SLi?E
.DN)ck:e;
至此,一个完整的分页程序完成。前台的只需要调用 3j}@}2D
J5j3#2l
userManager.listUser(page)即可得到一个Page对象和结果集对象 nm{J
;+NU;f/WM
的综合体,而传入的参数page对象则可以由前台传入,如果用 haoQr)S
VPI;{0kh
webwork,甚至可以直接在配置文件中指定。 0~GtK8^B
Sft+Gb6
下面给出一个webwork调用示例: rzO5 3\
java代码: aS)Gj?Odf
NB#-W4NA
syB.Z-Cpd
/*Created on 2005-6-17*/ 2)^gd
package com.adt.action.user; F\BD7W
p`mNy
o'
import java.util.List; TChKm-x
V^D!\)#
import org.apache.commons.logging.Log; P; DGs]PF
import org.apache.commons.logging.LogFactory; 89+Q^79m
import org.flyware.util.page.Page; eUZvJTE
Z+M* z;
import com.adt.bo.Result; {<#~Ya-
import com.adt.service.UserService; >[&Zs3>
import com.opensymphony.xwork.Action; 0$1-5XY9
WJs2d73Qp
/** 72akOx
* @author Joa ])D39
*/ 79G& 0 P\
publicclass ListUser implementsAction{ 6ntduXeNVh
]zUvs6ksLG
privatestaticfinal Log logger = LogFactory.getLog TBr@F|RXiO
d"~-D;
(ListUser.class); {~a+dEz
k*$[V17
private UserService userService; qpZR-O
DD^iEhG
private Page page; /j(3 ~%]o4
k*"FMJG_
privateList users; O$,bNu/g
rJws#^]
/* z]33_[G1U
* (non-Javadoc) 1_V',0|`>
* :I/i"g7<
* @see com.opensymphony.xwork.Action#execute() U%T{~f
*/ bS"zp6Di
publicString execute()throwsException{ r?:xD(}Q
Result result = userService.listUser(page); PZE{-TM?W
page = result.getPage(); H;k-@J
users = result.getContent(); 9S!
2r
return SUCCESS; 5 4vDP 9
} x-Ug(/!^
Kjfpq!NYE
/** iW$f1=i
* @return Returns the page. % >}{SS
*/ \95O
public Page getPage(){ Qs1e0LwA9
return page; lq*{2M{[
} i?D
KKjN$
Im<(
/** ZGZ+BOFL
* @return Returns the users. o{I]c#W
*/ HI%#S&d
publicList getUsers(){ 9}*<8%PSt,
return users; ie9,ye"
} *C"-$WU3o
8sz|9~
/** BMxe)izT;
* @param page H){lXR/#u
* The page to set. +x_9IvaW&?
*/ 29~Bu5
publicvoid setPage(Page page){ .^aqzA=]
this.page = page; 9:1[4o)~
} Y}UVC|Ef
lk`,s
/** LktH*ePO
* @param users ccm(r~lhJ
* The users to set. s?pd&_kOv3
*/ 9?L,DThQ
publicvoid setUsers(List users){ 2SHS!6:Rl
this.users = users; Y24H`
s1u/
} OS7^S1r-
E
whCX'Vaj
/** +%: /!T@@
* @param userService 6-!U\R2Z>
* The userService to set. ?@LqrKj11
*/ \2huDNW&
!
publicvoid setUserService(UserService userService){ w(-h!d51+
this.userService = userService;
1Bhd-
} q[Ed6FM$~
} *Z:'jV<
o b,%); m
I {&8iUN
WPbG3FrL!
_oBJ'8R\
上面的代码似乎看不出什么地方设置了page的相关初值,事实上, \Uh$%#}.
GO<,zOqvU
可以通过配置文件来进行配置,例如,我想每页显示10条记录,那 "B"Yfg[
m2h@*
么只需要: *%;+3SV
java代码: RwyRPc_
l:$i}.C
MeMSF8zSQ
<?xml version="1.0"?> NPY\ >pf
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork f&ri=VJY\T
U2TR>0l
1.0//EN" "http://www.opensymphony.com/xwork/xwork- VsR8|Hn$
i?0+f}5<p
1.0.dtd"> k/]4L!/ T
h
qT6]*
<xwork> ).D+/D/"2
9f U,_`r
<package name="user" extends="webwork- l Taw6;
<]e 0TU?bk
interceptors"> 3d81]!n
}{#ty uzAo
<!-- The default interceptor stack name 4/:}K>S_
vWpoaz/w
--> e$=UA%
<default-interceptor-ref *s1^s;LR
BfUM+RC%5
name="myDefaultWebStack"/> uS}qy-8J
T\3aT
<action name="listUser" /t"FZ#
~8l(,N0
class="com.adt.action.user.ListUser"> .`@)c/<0
<param yuA+YZ
TcEvUZJ"
name="page.everyPage">10</param> ]~!?(d!J/
<result {Z!x]}{M
pS6p}S=1]
name="success">/user/user_list.jsp</result> TpIx!R9
</action> 3 jR I@
bpp{Z1/4
</package> .0]\a~x
6zR9(c:a~
</xwork> *}<