Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ,mHQ
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Np.]
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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 Tc3~~ X
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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 'j#J1xwJ
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。 Au=9<WB%H
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分页支持类: `U.VfQR:
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java代码: vMlT
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package com.javaeye.common.util; G1!yPQa7d
: xBG~D
import java.util.List; dF`\ewRFn
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publicclass PaginationSupport { c; MF
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publicfinalstaticint PAGESIZE = 30; &*e(
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privateint pageSize = PAGESIZE; Ir,3' G
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privateList items; cu@i;Hb@
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privateint totalCount; )-u0n],
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privateint[] indexes = newint[0]; 9>OPaLn
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privateint startIndex = 0; 4g%BCGsys
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public PaginationSupport(List items, int &Q>tV+*
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totalCount){ fqY;>Z
setPageSize(PAGESIZE); `w;8xD(
setTotalCount(totalCount); 9_4bw9A
setItems(items); nYvx[
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setStartIndex(0); 8M~^/Zc
} y$Y*%D^w
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public PaginationSupport(List items, int VJf|r#2
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totalCount, int startIndex){ !EuqJjh
setPageSize(PAGESIZE); e -yL
setTotalCount(totalCount); e Lj1
setItems(items); 4[ .DQ#r
setStartIndex(startIndex); '=V!Y$tn
} rD?G7l<~>_
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public PaginationSupport(List items, int nG~#o
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totalCount, int pageSize, int startIndex){ A@?Rj
setPageSize(pageSize); ?b,x;hIO
setTotalCount(totalCount); }j_2K1NS{
setItems(items); KT9!R
setStartIndex(startIndex); r2xXS&9!|
} C-:lM1
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publicList getItems(){ "{@Q..hxC
return items; W[R^5{k`
} [d3i_^\
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publicvoid setItems(List items){ dln1JZ!
this.items = items; h8)m2KrZ!.
} ;dR4a@
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publicint getPageSize(){
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return pageSize; :p|wo"=@Ge
} y+"6Y14
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publicvoid setPageSize(int pageSize){ d8p<f+
this.pageSize = pageSize; M#CYDEB
} 2|re4
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publicint getTotalCount(){ %p(!7FDE2n
return totalCount; .:U`4->E
} s{:l yp
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publicvoid setTotalCount(int totalCount){ <=g{E-
if(totalCount > 0){ |3:e$
this.totalCount = totalCount; NU <K+k
int count = totalCount / |}07tUq
{}A1[Y|
pageSize; 1v
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if(totalCount % pageSize > 0) 5X1z^(
count++; u &qFE=5:
indexes = newint[count]; u;/5@ADW
for(int i = 0; i < count; i++){ V0O6\)/.
indexes = pageSize * @}oY6cW;B*
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i; 9()d7Y#d/`
} I%Yeq"5RB
}else{ WW&agr
this.totalCount = 0; +k<0:Fi
} QO;OeMQv%
} #<k L.e[
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publicint[] getIndexes(){ |H%[tkW6c
return indexes; \v]esIP5R'
} =uil3:,[S
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publicvoid setIndexes(int[] indexes){ [(kC/W)!
this.indexes = indexes; QrSF1y'd
} ,|lDR@
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k
publicint getStartIndex(){ S!@h\3d8{
return startIndex; 6VQe?oh
} [~v1
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publicvoid setStartIndex(int startIndex){ f[s|<U^
if(totalCount <= 0) gbvMS*KQz
this.startIndex = 0; X?gH(mn
elseif(startIndex >= totalCount) ,VYUQE>\
this.startIndex = indexes ^Q9;ro*;ck
~^ <1k-
[indexes.length - 1]; I8%Uyap{
elseif(startIndex < 0) $eU oFa5A
this.startIndex = 0; ~e; 2gm
else{ 7E]qP
5
this.startIndex = indexes j0q:i}/U,
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[startIndex / pageSize]; ,3P@5Ef
} S9mcThcZ
} s)BB(vQ]6
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publicint getNextIndex(){ q?0&&"T}
int nextIndex = getStartIndex() + =&,<Co1 hF
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pageSize; ?"Ec#,~
if(nextIndex >= totalCount) qdQQt5Y'm
return getStartIndex(); 98ot{+/LK
else (`cXS5R
return nextIndex; PO@b9O
} J`d_=C?J
*I<L1g%9d
publicint getPreviousIndex(){ BTAt9Z8qK
int previousIndex = getStartIndex() - G4jyi&]
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C~ u.
pageSize; =#so[Pd
if(previousIndex < 0) SsBiCctn
return0; F[5sFkM7
else :v
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return previousIndex; dc=}c/6x
} 3[r9v!l
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} Bbj%RF2,
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抽象业务类 +zL|j/q ?
java代码: AA &>6JB{
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/** $_Kcm"oj
* Created on 2005-7-12 A9;!\Wo
*/ t#N@0kIX.
package com.javaeye.common.business; UpFm3gKF
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import java.io.Serializable; $VNj0i. Pr
import java.util.List; yR$ld.[uf
Q^ }Ib[
import org.hibernate.Criteria; 6^VPRp
import org.hibernate.HibernateException; Em]2K:
import org.hibernate.Session; 5D6 ,B
import org.hibernate.criterion.DetachedCriteria; 76eF6N+%}t
import org.hibernate.criterion.Projections; `3?5Z/,y
import qx f8f
VXP@)\!
org.springframework.orm.hibernate3.HibernateCallback; r>_40+|&
import |E?,hTRe5
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org.springframework.orm.hibernate3.support.HibernateDaoS y"T(Unvc
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upport; ,p)Qu%'
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import com.javaeye.common.util.PaginationSupport; <X"_S'O
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public abstract class AbstractManager extends 1haNpLfS>
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HibernateDaoSupport { pQCocy
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privateboolean cacheQueries = false; 4'#?"I
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privateString queryCacheRegion; 9$s~ `z)
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publicvoid setCacheQueries(boolean 77H"=
;)23@6{R%
cacheQueries){ $i|d=D&t
this.cacheQueries = cacheQueries; CNl @8&R
} %?m_;iv
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publicvoid setQueryCacheRegion(String pg.BOz\'q
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queryCacheRegion){ TOw;P:-
this.queryCacheRegion = VM}7 ~
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queryCacheRegion; i)q8p
} E(!b_C&
:6jh*,OHZl
publicvoid save(finalObject entity){ 1!W'0LPM
getHibernateTemplate().save(entity); f-`C1|\w
} ]XjL""EbC
+lw8YH
publicvoid persist(finalObject entity){ UW'@3#<?
getHibernateTemplate().save(entity);
%\] x}IC
} trz&]v=:
p8(Z{TSv
publicvoid update(finalObject entity){ `5
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getHibernateTemplate().update(entity); #pnB+h&tE
} Dg}$;PK
j@.^3:
publicvoid delete(finalObject entity){ Mhu|S)hn
getHibernateTemplate().delete(entity); '0<9+A#
} Sf'uKSX1%
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publicObject load(finalClass entity, UIC~%?oIA
q$'D}OH T
finalSerializable id){ v2Vmcc_]9x
return getHibernateTemplate().load q,T4-
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(entity, id); M
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} +?v2MsF']
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publicObject get(finalClass entity, \49s;\I]
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finalSerializable id){ 3QDz9KwCAw
return getHibernateTemplate().get >Xi/ p$$7u
w >w zV=R
(entity, id); ?izl#?
} G=PX'dS
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publicList findAll(finalClass entity){ rGlnu.mK^
return getHibernateTemplate().find("from n;LjKE
a FL;E
" + entity.getName()); a5?Yh<cJ
} a=
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publicList findByNamedQuery(finalString t!\B6!Fo
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namedQuery){ r"!xI
return getHibernateTemplate ;r}yeISf
sBa&]9>m
().findByNamedQuery(namedQuery); @?*;
-]#)
} ^$s&bH'8
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publicList findByNamedQuery(finalString query, }H:wgy`
ej,R:}C%`
finalObject parameter){ Y)2#\ F
return getHibernateTemplate rgF4 W8
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().findByNamedQuery(query, parameter); JPM~tp?;<
} fZb}-
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publicList findByNamedQuery(finalString query, vZ1?4hG
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finalObject[] parameters){ QzxEkTc;
return getHibernateTemplate ?2,{+d |
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().findByNamedQuery(query, parameters); n(W&GSj|u9
} [l}H%S
7Q9| P?&:z
publicList find(finalString query){ }$b!/<7FD
return getHibernateTemplate().find S0`u!l89(
aKintb}n
(query); |nBs(>b
} Q5HSik4
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publicList find(finalString query, finalObject 54#P
c7D{^$L9v
parameter){ z9E*1B+
return getHibernateTemplate().find S$
k=70H
<m~{60{
(query, parameter); G5ShheZd
} u82 (`+B
/[!<rhY
public PaginationSupport findPageByCriteria 9"zp>VR
xlH3t&i7
(final DetachedCriteria detachedCriteria){ :!JQ<kV
return findPageByCriteria mbns%%GJU
Tj+U:#!!~
(detachedCriteria, PaginationSupport.PAGESIZE, 0); S]NT +XM
} CSY-{
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public PaginationSupport findPageByCriteria 7^syu;DT9Y
t N4-<6
(final DetachedCriteria detachedCriteria, finalint / ;+Mz*
)iid9K<HB
startIndex){ /D964VR1M\
return findPageByCriteria 3taGb>15
^6J*:(eM
(detachedCriteria, PaginationSupport.PAGESIZE, ^^F 8M0k3
0rvBjlFT
startIndex); jVh:Bw
} z[@i=avPG
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public PaginationSupport findPageByCriteria Bg}l$?S
BkP4.XRI
(final DetachedCriteria detachedCriteria, finalint YFDOp*
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pageSize, <s%Ft
finalint startIndex){
: 76zRF
return(PaginationSupport) 8`6G_:&X
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getHibernateTemplate().execute(new HibernateCallback(){ ;y-:)7J
publicObject doInHibernate j{D tjV8
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(Session session)throws HibernateException { )+ 'r-AF*
Criteria criteria = .PV(MV
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detachedCriteria.getExecutableCriteria(session); UA(4mbz+
int totalCount = @v3)N[|d
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((Integer) criteria.setProjection(Projections.rowCount qHT73_R
} =Xlac_U
()).uniqueResult()).intValue(); )5n:UD{f[#
criteria.setProjection Q @[gj:w
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(null); I0qJr2[X~
List items = I1rB,%p
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criteria.setFirstResult(startIndex).setMaxResults u-tD_UIck
^qi+Y)dU|
(pageSize).list(); H23 O]r
PaginationSupport ps = sPVE_n
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new PaginationSupport(items, totalCount, pageSize, uUV"86B_
, &n"#
startIndex); eoXbZ
return ps; Bl^BtE?-b
} >; tE.CJH
}, true); 3SI0etVr
} HA7%8R*.2i
f( Dtv
public List findAllByCriteria(final G:y+yE4
W;l0GxOxQ
DetachedCriteria detachedCriteria){ qHtIjtt[q
return(List) getHibernateTemplate Z}t^i^u
aGfp"NtL
().execute(new HibernateCallback(){ e]CoYuPr
publicObject doInHibernate "R=~-, ~
RWX!d54&
(Session session)throws HibernateException { :H&G}T(#
Criteria criteria = ALcPbr
z"mpwmv5
detachedCriteria.getExecutableCriteria(session); Go^TTL
return criteria.list(); cx ("F/Jm
} h&n1}W+
}, true); s~bi#U;dF
} t\a|Gp W
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public int getCountByCriteria(final H?!DcUg CC
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DetachedCriteria detachedCriteria){ qVI0?B
x
Integer count = (Integer) z+{+Q9j
}/h&`0z`
getHibernateTemplate().execute(new HibernateCallback(){ BvH?d]%
publicObject doInHibernate 8e^u KYR<
}}ic{931
(Session session)throws HibernateException { */_ 'pt
Criteria criteria = ^\kH^
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detachedCriteria.getExecutableCriteria(session); !s?SI=B8
return FvYciU!
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criteria.setProjection(Projections.rowCount k#u)+e.'
F#M(#!)Y"
()).uniqueResult(); ^sFO[cYo
} /nu z_y\J
}, true); <VQ)}HW;k
return count.intValue(); 1r_V$o$
} -%gEND-AP
} eO(U):C2
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用户在web层构造查询条件detachedCriteria,和可选的 =6O*AJ
@6UZC-M0
startIndex,调用业务bean的相应findByCriteria方法,返回一个 >T c\~l
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PaginationSupport的实例ps。 -u4")V>
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ps.getItems()得到已分页好的结果集 R dwt4A+
ps.getIndexes()得到分页索引的数组 ^jUw4Dj~-q
ps.getTotalCount()得到总结果数 EpyMc+.Ze'
ps.getStartIndex()当前分页索引
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ps.getNextIndex()下一页索引 #.[eZ[
ps.getPreviousIndex()上一页索引 KX7fgC
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 u%+k\/Scp.
hjM?D`5x
,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 +xU( {/
l"1D'Hk
一下代码重构了。 Ox&G
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FMI1[|:;
我把原本我的做法也提供出来供大家讨论吧: lw[c+F7
FKu8R%9xn%
首先,为了实现分页查询,我封装了一个Page类: ed}#S~4q
java代码: Y&8,f|{R
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/*Created on 2005-4-14*/ %lWOW2~R
package org.flyware.util.page; qP<D9k>
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/** LX oJw$C
* @author Joa x.wDA3ys
* 7`&ISRU4
*/ l
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publicclass Page { Xa.8-a"hz
{,+c
/** imply if the page has previous page */ Ez0zk9
privateboolean hasPrePage; KXK5\#+L
dpscgW{M
/** imply if the page has next page */ (.V),NKG
privateboolean hasNextPage; dXQ C}JA
F.5fasdX'
/** the number of every page */ h]k$K
privateint everyPage; FE&:?
F;8Q`$n
/** the total page number */ Q= fl!>P
privateint totalPage; %dg[ho
,xVAJ6_#
/** the number of current page */ (IVhj^dQm
privateint currentPage; )y;7\-K0
_/noWwVu
/** the begin index of the records by the current O0xqA\
$P?^GB>u
query */ RK &>!^
privateint beginIndex; *wj5( B<y
3oMHy5
rf:H$\yw
/** The default constructor */ HOFxOBV
public Page(){ kDWEgnXK,v
7#%Pry
} LlO8]b!P-^
=urGs`\
/** construct the page by everyPage 4}v|^_x-i
* @param everyPage ;-kDJi
* */ BR@m*JGajz
public Page(int everyPage){ URrx7F98
this.everyPage = everyPage; B6k<#-HAT
} ektU,Oo
)3:0TFS}}k
/** The whole constructor */ >>$`]]7
public Page(boolean hasPrePage, boolean hasNextPage, &k%>u[Bo
/G'3!S
3U+FXK#6
int everyPage, int totalPage, VDbbA\
int currentPage, int beginIndex){ ZDbe]9#Xh
this.hasPrePage = hasPrePage; Q]/%Y[%|
this.hasNextPage = hasNextPage; n*=#jL
this.everyPage = everyPage; w"s@q$}]8M
this.totalPage = totalPage; FZj>N(
this.currentPage = currentPage; k-=LD
this.beginIndex = beginIndex; aW&)3C2-x
} II}M|qHaK
>a<1J(c
/** .E}lAd.Mn
* @return ;ISnI
* Returns the beginIndex. T TN!$?G3
*/ pLtw|S'4
publicint getBeginIndex(){ 2icQ (H;
return beginIndex; e@W+ehx"
} m)Kg6/MV.
x'I!f? / &
/** </`\3t
* @param beginIndex ?}4,s7PR
* The beginIndex to set. ebQgk
Y=
*/ kt978qfk
publicvoid setBeginIndex(int beginIndex){ W
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this.beginIndex = beginIndex; 7<]
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} p|ink):
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/** V9BW@G@9
* @return z m$Sw0#(
* Returns the currentPage. Wq1 jTIQ
*/ 6~x'~T
publicint getCurrentPage(){ 2]]v|Z2M4
return currentPage; P$#: $U@
} PVBz~rG
~E7IU<B
/** =,#--1R7g
* @param currentPage d/&>
`[i
* The currentPage to set. UgC65O2
*/ \}?X5X>
publicvoid setCurrentPage(int currentPage){ $0E+8xE
this.currentPage = currentPage; }Pg}"fb^
} m"iA#3l*=
nm,LKS7
/** F^NK"<tW
* @return <]M.K3>
* Returns the everyPage. $zjdCg<
*/ 5?^L))
publicint getEveryPage(){ x1.S+:
return everyPage; /q]rA
} f|~ {j(.v
LnI
/** rQVX^
* @param everyPage {}$7B p
* The everyPage to set. EyE#x_A
*/ w>&*-}XX
publicvoid setEveryPage(int everyPage){ w31Ox1>s
this.everyPage = everyPage; 1*TbgxS~W
} WK>|IgK
^Fco'nlM
/** nTEN&8Y>R
* @return Gs,:$Im
* Returns the hasNextPage. -V|"T+U
*/ %'=*utOxy
publicboolean getHasNextPage(){ zXn-E
return hasNextPage; o3 fc -
} "s(~k
:pqUUZ6x&
/** ,KW
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6
* @param hasNextPage t~->&Ja
* The hasNextPage to set. LKu\M h|
*/ S%i^`_=Q
publicvoid setHasNextPage(boolean hasNextPage){ ZNX38<3h
this.hasNextPage = hasNextPage; l4oyF|oJTH
} Icnhet4
'p&,'+x
/** qUkMNo3
* @return VI&x1C
* Returns the hasPrePage. FvxM
*/ _s=H|#l
publicboolean getHasPrePage(){ _F;v3|`D@<
return hasPrePage; 'BjTo*TB]Z
} ,twx4r^
XVYFyza;
/** @Nek;xJ
* @param hasPrePage /*mF:40M;
* The hasPrePage to set. hw^&{x
*/ uw}Rr7q
publicvoid setHasPrePage(boolean hasPrePage){ aixX/se
this.hasPrePage = hasPrePage; *9aJZWf>V
} ^Co$X+
;Y?MbD
/** dI{DiPho
* @return Returns the totalPage. ~|V^IJZ22
* faDSyBLo
*/ L(Y1ey9x
publicint getTotalPage(){ ai{>rO3 }I
return totalPage; l#'V
SFm&
} P=QxfX0B
9r!8BjA
/** %=`JWLLG
* @param totalPage kJWg},-\
* The totalPage to set. 7>JTQ CJ
*/ d~LoHp
publicvoid setTotalPage(int totalPage){ ci~#G[_$S
this.totalPage = totalPage; ^`&'u_B!+
} r7m~.M+W"
CJ IuMsZ
} zw/AZLS
;)(g$r^_i
D@O`"2
4ba*Nc*Yc
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 -K64J5|b7
2B
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个PageUtil,负责对Page对象进行构造: oJ74Mra
java代码: z0[XI 7KK
r
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h.jJAVPi
/*Created on 2005-4-14*/ 4l$OO;B
package org.flyware.util.page; |kYlh5/c d
] G&*HMtp
import org.apache.commons.logging.Log; b(iF0U>&
import org.apache.commons.logging.LogFactory; )kpEcMlR
N~v6K}`}
/** wVBKVb9N
* @author Joa i(}PrA
* d1<";b2Jt^
*/ -50DGA,K6
publicclass PageUtil { ;CYoc4e
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privatestaticfinal Log logger = LogFactory.getLog B/twak\
bdg6B7%Q
(PageUtil.class); ^#9385
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/** u_(~zs.N]
* Use the origin page to create a new page ;tjOEmIiU
* @param page
"o5]:]h)
* @param totalRecords [jMN*p?
* @return hsC T:1i
*/ (Xd8'-G$m
publicstatic Page createPage(Page page, int ujU,O%.n
Fc~G*Gz~Z|
totalRecords){ nf.Ox.kM)
return createPage(page.getEveryPage(), -@pjEI
cHjQwl
page.getCurrentPage(), totalRecords); )PX VR
T
} -'! J?~
k^J8 p#`6
/** <J/ =$u/
* the basic page utils not including exception ma.84~m
"tJ+v*E
handler I|Oco?Q"
* @param everyPage }Q\%tZC#T
* @param currentPage q~ H>rC(\
* @param totalRecords %5o2I_Cjz
* @return page )l3Uf&v^f
*/ <!OBpAq
publicstatic Page createPage(int everyPage, int a3@E`Z
$R9D
L^iD
currentPage, int totalRecords){
gjS|3ED
everyPage = getEveryPage(everyPage); %~u]|q<{
currentPage = getCurrentPage(currentPage); ^P)f]GQx
int beginIndex = getBeginIndex(everyPage, D|-]<r1"
L5&M@YTH
currentPage); 1-2hh)
int totalPage = getTotalPage(everyPage, n(:<pz
mUYRioNj
totalRecords); ZT0\V
]!B
boolean hasNextPage = hasNextPage(currentPage, U0x
A~5B
YvR bM
totalPage); r/Y J, 2!
boolean hasPrePage = hasPrePage(currentPage); ij"~]I
]PXM;w
returnnew Page(hasPrePage, hasNextPage, GEBSUvM 7
everyPage, totalPage, UcRP/LR%C
currentPage, A_xC@$1e<
g`XngRb|j
beginIndex); W }NUU
} Jj4HJ9
$J[( 3
privatestaticint getEveryPage(int everyPage){ iC"iR\Qu
return everyPage == 0 ? 10 : everyPage; ){^J8]b7#
} cD!,ZL
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privatestaticint getCurrentPage(int currentPage){
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return currentPage == 0 ? 1 : currentPage; CIudtY(:
} NR4+&d
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privatestaticint getBeginIndex(int everyPage, int p.DQ|?
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currentPage){ gq=t7b
return(currentPage - 1) * everyPage; *1|7%*!8
} ACszx\[K3
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privatestaticint getTotalPage(int everyPage, int 'Y38VOI%
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totalRecords){ 'VDWJTia
int totalPage = 0; ?CpVA
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if(totalRecords % everyPage == 0) d"wA"*8~y
totalPage = totalRecords / everyPage; G|6qL
else 77>oQ~q
totalPage = totalRecords / everyPage + 1 ; 8mI(0m'
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return totalPage; @8d 3
} m1$tf
^
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privatestaticboolean hasPrePage(int currentPage){ K~W(ZmB
return currentPage == 1 ? false : true; EVmBLH-a
} 6^`iuC5
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privatestaticboolean hasNextPage(int currentPage, [doEArwn
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int totalPage){ dlu*s(O"
return currentPage == totalPage || totalPage == ?qh-#,O9B
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0 ? false : true; #{i*9'
} waMF~#PJlt
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} "Q?+T:D8|
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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。 DAn2Pqf
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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 I G1];vX
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做法如下: uwe#&