Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 <niHJ*
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 LuQ=i`eXx
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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 nM}X1^PiK"
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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 #kma)_X
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分页支持类: oVmGZhkA@'
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java代码: /H!I90
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package com.javaeye.common.util; 9^Wj<
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import java.util.List; pN%L3?2
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publicclass PaginationSupport { ,gkxZ{Eh
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publicfinalstaticint PAGESIZE = 30; <R]?8L0{h
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privateint pageSize = PAGESIZE; k[G? 22t
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privateList items; OZk(VMuI
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privateint totalCount; ^pZ(^
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privateint[] indexes = newint[0]; Y
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privateint startIndex = 0; Y.Gr(]tk
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public PaginationSupport(List items, int &XgB-}^:
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totalCount){ Fwho.R-.
setPageSize(PAGESIZE); -Z6ot{%
setTotalCount(totalCount); \Sg&Qv`
setItems(items); '+'
setStartIndex(0); u49/LtB\
} roL~r`f`
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public PaginationSupport(List items, int Ld+}T"Z&M>
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totalCount, int startIndex){ 6,s@>8n
setPageSize(PAGESIZE); \zgRzO'N
setTotalCount(totalCount); gpE5ua&
setItems(items); ot-!_w<
setStartIndex(startIndex); $IB@|n
} "R):B~8|H{
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public PaginationSupport(List items, int g-')|0py
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totalCount, int pageSize, int startIndex){ <7)Vj*VxC
setPageSize(pageSize); [ &R-YQ@
setTotalCount(totalCount); t{84ioJ"$
setItems(items); hDVD@b
setStartIndex(startIndex); ~v+&
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} b6);bX>e
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publicList getItems(){ }$m_):t@@
return items; PO |p53
} m}F1sRkdQ
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publicvoid setItems(List items){ "kf7??Z
this.items = items; u5T\_0
} %2/WyD$U
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publicint getPageSize(){ }54\NSj0
return pageSize; Ct
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} #T
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publicvoid setPageSize(int pageSize){ }$g5:k!
this.pageSize = pageSize; ?^,GaZ^V
} <}i\fJX6
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publicint getTotalCount(){ [f-
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return totalCount; Cn+TcdHX
} c;(}Ih(#
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publicvoid setTotalCount(int totalCount){ rQ~%SUM7
if(totalCount > 0){ 63F0Za}h
this.totalCount = totalCount; SM0=
int count = totalCount / B>9D@fmzs
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pageSize; Xo]FOJ5
if(totalCount % pageSize > 0) d{9jd{
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count++; 7J0PO}N
indexes = newint[count]; s
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for(int i = 0; i < count; i++){ S{fNeK
indexes = pageSize * c3K(mM:
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i; Kd^
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} 9J l9\y9
}else{ G0a UZCw
this.totalCount = 0; @bD,^3 U
} ^"*r'
} sQTW?KA-Te
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publicint[] getIndexes(){ n;2W=N?y
return indexes; &wLI:x5
} k('2K2P
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publicvoid setIndexes(int[] indexes){ 7!L"ef62o
this.indexes = indexes; NV*t
} ]sbu9O ^"f
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publicint getStartIndex(){ ZTHrjW1
return startIndex; ?4gYUEM#
} U'Vz
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publicvoid setStartIndex(int startIndex){ l|5ss{llR
if(totalCount <= 0) *3.
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this.startIndex = 0; YzEa?F*$
elseif(startIndex >= totalCount) 0 ,Bd,<3
this.startIndex = indexes & ({X9
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[indexes.length - 1]; 6VCw>x
elseif(startIndex < 0) C 5)G^
this.startIndex = 0; o5AyJuS-u$
else{ ]]9eUw=
this.startIndex = indexes "4Anh1,js
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[startIndex / pageSize]; O+z-6:`
} %Z.>)R4
} udW,
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publicint getNextIndex(){ [.|tD
int nextIndex = getStartIndex() + a-8~f8na{(
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pageSize; #Wh"_zpM+
if(nextIndex >= totalCount) gp(w6:w
return getStartIndex(); S(/@.gI:f
else *|hICTWL
return nextIndex; \XmtSfFC
} d4A}BTs1
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publicint getPreviousIndex(){ 8fZ\})t
int previousIndex = getStartIndex() - va#~ \%`
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pageSize; EMJio\
if(previousIndex < 0) 1 5rE|m^
return0; ZLo3
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else sveFxI
return previousIndex; tA'i-D&
} <>2QDI6_
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} ?Yz.tg
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抽象业务类 ilpg()
java代码: N[zI@>x
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/** sm\/wlbE
* Created on 2005-7-12 PP$Ig2Q
*/ 4!iS"QH?;^
package com.javaeye.common.business; i~k?k.t8
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import java.io.Serializable; $c f?`k
import java.util.List; hq\KSFP
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import org.hibernate.Criteria; YHCXVu<.b
import org.hibernate.HibernateException; \h_hd%'G
import org.hibernate.Session; ${e(#bvGZ
import org.hibernate.criterion.DetachedCriteria; $?I^Dk
import org.hibernate.criterion.Projections; 9$S2:2(G
import 0*q~(.>a
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org.springframework.orm.hibernate3.HibernateCallback; ,CwhpW\Y
import I>G)wRpfR'
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org.springframework.orm.hibernate3.support.HibernateDaoS bncK8SK
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upport; bCA3w%,kM
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import com.javaeye.common.util.PaginationSupport; )mwY]
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public abstract class AbstractManager extends 7Zr jU{
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HibernateDaoSupport { HHtp.;L/
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privateboolean cacheQueries = false; ed*=p
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privateString queryCacheRegion; (|O;Ci
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publicvoid setCacheQueries(boolean x{Gih1
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cacheQueries){ |oO0%#1H
this.cacheQueries = cacheQueries; bu@Pxz%_
} Wpj.G
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publicvoid setQueryCacheRegion(String /A##Yv!biR
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queryCacheRegion){ TvM{ QGN
this.queryCacheRegion = Ia>qVM0
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queryCacheRegion; t}NxD`8
} &
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publicvoid save(finalObject entity){ Rra(/j<rQ
getHibernateTemplate().save(entity); "D@m/l
} 5Ko"-
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publicvoid persist(finalObject entity){ ls#O0
getHibernateTemplate().save(entity); '[Nu;(>a
} .%~
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publicvoid update(finalObject entity){ "@`M>)*o
getHibernateTemplate().update(entity); *Q51'?y
} NP%ll e,l
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publicvoid delete(finalObject entity){ G++kUo<
getHibernateTemplate().delete(entity); B}r@x z
} EEaKT`/d
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publicObject load(finalClass entity, tDIzn`$z
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finalSerializable id){ jY ^ndr0;
return getHibernateTemplate().load ]1D>3
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(entity, id); i?*&1i@
} 2LD4f[a;
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publicObject get(finalClass entity, FcfN]!
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finalSerializable id){ YMqL,&Q{1
return getHibernateTemplate().get rr9HC]63
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(entity, id); & qd:o}
} 5z El`h
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publicList findAll(finalClass entity){ >@]E1Qfe
return getHibernateTemplate().find("from ;'p0"\SV
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" + entity.getName()); nc$?tC9V
} 1d-j_H`s
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publicList findByNamedQuery(finalString <NS=<'U
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namedQuery){ 4b7}Sr=`
return getHibernateTemplate 5'oWd
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().findByNamedQuery(namedQuery); EHo"y.ODg
} C-4I
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publicList findByNamedQuery(finalString query, UDp"+nS
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finalObject parameter){ fI"`[cA"]
return getHibernateTemplate GI6 EZ}.MZ
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().findByNamedQuery(query, parameter); vLpE|QZ s
} ~(hmiNa;
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publicList findByNamedQuery(finalString query, ;{HxY98Q
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finalObject[] parameters){ 5HOhk"
return getHibernateTemplate QuF%m^aE
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().findByNamedQuery(query, parameters); guFR5>-L
} =YPWt>\a}
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publicList find(finalString query){ H<1C5-
return getHibernateTemplate().find :()4eK/\
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(query); &dOV0y_
} Q[~O`Lz
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publicList find(finalString query, finalObject uP+
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parameter){ $ g1p!
return getHibernateTemplate().find " I _T
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(query, parameter); BDB-OJ
} ;39{iU.m
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public PaginationSupport findPageByCriteria 9)f1CC]
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(final DetachedCriteria detachedCriteria){ !q7M+j4
return findPageByCriteria #2cH.`ty
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); >n` OLHg;
} ,QKG$F
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public PaginationSupport findPageByCriteria YK}(VF?&
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(final DetachedCriteria detachedCriteria, finalint tgrQ$Yjk
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startIndex){ Tri.>@-u
return findPageByCriteria L;BYPZR
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(detachedCriteria, PaginationSupport.PAGESIZE, C*c=@VAa
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startIndex); q*'hSt@+D
} 4)XN1r:
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public PaginationSupport findPageByCriteria (:[><-h.
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(final DetachedCriteria detachedCriteria, finalint K-vso4@BJ
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pageSize, - MBK/
finalint startIndex){ ~zRW*pd
return(PaginationSupport) 4|Y0$(6o
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getHibernateTemplate().execute(new HibernateCallback(){ dC.uK^FuJ
publicObject doInHibernate 9&2kuLp?P
<@zOdW|{:
(Session session)throws HibernateException { Gjv'$O2_
Criteria criteria = 9V"^F.>
*b.>pY?2|
detachedCriteria.getExecutableCriteria(session); ,eZ'pxt
int totalCount = L(8Q%oX%o
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((Integer) criteria.setProjection(Projections.rowCount +x+H(of.
"bw4{pa+
()).uniqueResult()).intValue(); m6IZGl7%
criteria.setProjection "`&?<82
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(null); k+s<;{
List items = Mq*Sp
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} [75`pC~O
criteria.setFirstResult(startIndex).setMaxResults c)Y I3G$
b!`:|!7r'
(pageSize).list(); ;dB=/U>3U
PaginationSupport ps = ~xHr/:
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new PaginationSupport(items, totalCount, pageSize, Kvk;D ]$
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startIndex); (Ojg~P4;&
return ps; 8fDnDA.e
} Dnd
}, true); tcRK\
} y:v0&9L
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public List findAllByCriteria(final lhxhAe
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DetachedCriteria detachedCriteria){ _$, .NK,6
return(List) getHibernateTemplate G=b`w;oL:
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().execute(new HibernateCallback(){ u' r;-|7
publicObject doInHibernate d<Z`)hI{K
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(Session session)throws HibernateException { IWMqmCbv
Criteria criteria = 4}NFa;M1
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detachedCriteria.getExecutableCriteria(session); ?.,cWKGQ}
return criteria.list(); A\: =p
} X*8U%uF
}, true); ^pg5o)M
} QU417EV'
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public int getCountByCriteria(final %*/?k~53
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DetachedCriteria detachedCriteria){ Ii4Byyfx
Integer count = (Integer) HD`Gi0
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getHibernateTemplate().execute(new HibernateCallback(){ g0iV#i
publicObject doInHibernate }7&;YAt
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(Session session)throws HibernateException { DE. Pw+5<.
Criteria criteria = bu$5gGWVf
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detachedCriteria.getExecutableCriteria(session); ^:DlrI$
return -
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criteria.setProjection(Projections.rowCount =fRP9`y
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()).uniqueResult(); X}?cAo2N
} op"Cc
}, true); }uZhoA
return count.intValue(); hL8QA!
} q Rtgk
} .[CXW2k
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用户在web层构造查询条件detachedCriteria,和可选的 HPU7
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ) d\Se9!
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PaginationSupport的实例ps。 JQ.ZAhv
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ps.getItems()得到已分页好的结果集 qk:F6kL\`
ps.getIndexes()得到分页索引的数组 43 |zjE
ps.getTotalCount()得到总结果数 Oj<2_u
ps.getStartIndex()当前分页索引 Ujw^j
ps.getNextIndex()下一页索引 \DfvNeF
ps.getPreviousIndex()上一页索引 *y`^Fc
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 y0rT=kU
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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 W]rXt,{&
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一下代码重构了。 -|V@zSKr3
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我把原本我的做法也提供出来供大家讨论吧: 3 :f5xF
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首先,为了实现分页查询,我封装了一个Page类: 5oORwOP
java代码: N7Ne
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/*Created on 2005-4-14*/ XrBLw}lD`N
package org.flyware.util.page; (o e;pa
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/** Z1q'4h=F.
* @author Joa *]F3pP[
* @^`f~0#:
*/ J7mT&U&Ru
publicclass Page { 2t[inzn=E
WL$WWA08_
/** imply if the page has previous page */ 6
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privateboolean hasPrePage; abI[J]T9G
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/** imply if the page has next page */ Pyk~V)~M
privateboolean hasNextPage; ,=K!Y TeVl
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/** the number of every page */ M0_K%Z(zaR
privateint everyPage; spFsrB
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/** the total page number */ ,g^Bu{?
privateint totalPage; nA+[[(6
S:
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/** the number of current page */ l*%?C*
privateint currentPage; |=GRPvvi
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/** the begin index of the records by the current 'v\!}6
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query */ &Vl,x/
privateint beginIndex; y
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/** The default constructor */ {|>~#a49h
public Page(){ !%5{jO1
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} /\Q{i#v
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/** construct the page by everyPage 2X6y^f';\
* @param everyPage d6(qc< /!r
* */ IO,kP`Wcx
public Page(int everyPage){ 36lIV,YnU
this.everyPage = everyPage; m,=$a\UC
} yP[GU| >(
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/** The whole constructor */ R_Eu*Quj
public Page(boolean hasPrePage, boolean hasNextPage, zSkM8LM2
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int everyPage, int totalPage, M: `FZ}&L
int currentPage, int beginIndex){ 9>zN 27
this.hasPrePage = hasPrePage; t7-sCC0
this.hasNextPage = hasNextPage; z*x6V0'yt
this.everyPage = everyPage; LzgD#Kz
this.totalPage = totalPage; HqN|CwGgJ:
this.currentPage = currentPage; ydlH6 >
this.beginIndex = beginIndex; }KZ/>Z;^
} yv'mV=BMJ!
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/** u5idH),<
* @return 8t6h^uQ
* Returns the beginIndex. {d )Et;_
*/ .# M5L
publicint getBeginIndex(){ #|$7. e
return beginIndex; oNiS"\t
} !3T x\a`?/
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/** Y*"%;e$tg
* @param beginIndex xD_jfAH'
* The beginIndex to set. 2RM1-j
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*/ ` 6"\.@4
publicvoid setBeginIndex(int beginIndex){ Jl5<9x
this.beginIndex = beginIndex; uj8]\MY
} ~2"|4
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/** l~f +h?cF
* @return ~\ iuV
* Returns the currentPage. 5B98}N
*/ -"a]) -
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publicint getCurrentPage(){ Y}|78|q*
return currentPage; )8 iDjNM<
} iJsw:Nc
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/** ?xeq*<qfI
* @param currentPage 2TAy'BB;)
* The currentPage to set. 4+ 4?0R
*/ X>Xpx<RY!
publicvoid setCurrentPage(int currentPage){ kfmIhHlYQ
this.currentPage = currentPage; ^5GS!u"
} V=S`%1dLN
j^64 :3
/** uCUBs(iD
* @return _$Fi]l!f
* Returns the everyPage. [;X YT
*/ }1$8)zH
publicint getEveryPage(){ *X<De
return everyPage; jCa{WV:K}
} }hBv?B2/1
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/** VK|!aqA{b
* @param everyPage T;FzKfT|
* The everyPage to set. (@&|
*/ WxXVL"
publicvoid setEveryPage(int everyPage){ VD=$:F]
this.everyPage = everyPage; *w%;$\^
} NgH%
}f({03$
/** $~`(!pa:
* @return !p9BH6$`
* Returns the hasNextPage. [hFyu|I!
*/ Z:n33xh=<
publicboolean getHasNextPage(){ .{8lG^0U<
return hasNextPage; -D
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} 3^`bf=R
w=f8UtY9@A
/** ^Xb!dnT.*a
* @param hasNextPage JP@UvDE|
* The hasNextPage to set. mKn[>M1
*/ 0,/[r/=jT
publicvoid setHasNextPage(boolean hasNextPage){ {'X "9@
this.hasNextPage = hasNextPage; 1r.q]^Pq~
} C6,Bqlio
c=Z#7?k=Uz
/** n09|Jzv9
* @return NtT)Wl
* Returns the hasPrePage. ivGxtx
*/ U'#{v7u
publicboolean getHasPrePage(){ Xi|v!^IT
return hasPrePage; Sa<R8X'J
} pF8'S{y
vJcvyz#%1
/** 61C&vm
* @param hasPrePage p]a IMF_
* The hasPrePage to set. ?9PNCd3$d
*/ k} <mmKB
publicvoid setHasPrePage(boolean hasPrePage){ U O[p
this.hasPrePage = hasPrePage; m<076O4|`
} hA~}6Qn
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/** UbuxD })
* @return Returns the totalPage. Y<M}'t
* %EVg.k$
*/ OZv&{_b_
publicint getTotalPage(){ UcK!v*3E
return totalPage; ^^ ?ECnpcU
} 979L] H#
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/** B
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* @param totalPage Q2#)Jx\6!
* The totalPage to set. v'iQLUgI
*/ T&0tW"r?
publicvoid setTotalPage(int totalPage){ eq/s8]uM
this.totalPage = totalPage; nDPfr\\
} }k,Si9O
*'`-plS7
} 3Yr
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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 dvxH:,
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个PageUtil,负责对Page对象进行构造: 6: M
java代码: ;aFQP:l/
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/*Created on 2005-4-14*/ BS{">lPmx
package org.flyware.util.page; R.RCa$
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import org.apache.commons.logging.Log; -BjB>Vt
import org.apache.commons.logging.LogFactory; "oTwMU
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/** jwE<}y
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* @author Joa EM([N*8o
* gReaFnm
*/ &2c?g1%
publicclass PageUtil { z#-&M J
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privatestaticfinal Log logger = LogFactory.getLog = F:d#j>F
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(PageUtil.class); GEvif4
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/** I
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* Use the origin page to create a new page sB"]R%`_
* @param page T&{EqsI=B
* @param totalRecords 1Ju{IEV
* @return I)sCWC:Mq~
*/ L'Wcb
=;
publicstatic Page createPage(Page page, int wv*r}{%7g[
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totalRecords){ jy1*E3vQ
return createPage(page.getEveryPage(), DLz~$TF^
w.V8-9{
page.getCurrentPage(), totalRecords); H-S28%.
} E]e6a^J#
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/** \dCdyl6V
* the basic page utils not including exception $QY(7Z"
g,q&A$Wi
handler a(<nk5
* @param everyPage z?K+LTf8
* @param currentPage RLIugz{IH
* @param totalRecords %f>V\z_C
* @return page Ml)WY#7
*/ q_I ''L
publicstatic Page createPage(int everyPage, int "%sW/ph
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currentPage, int totalRecords){ <Siz5qQI4
everyPage = getEveryPage(everyPage); Sx pl%
currentPage = getCurrentPage(currentPage); %i96@6O
int beginIndex = getBeginIndex(everyPage, &yP9vp="
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currentPage); q,m6$\g4
int totalPage = getTotalPage(everyPage, l~\'Z2op
"rX`h
totalRecords); k3e
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boolean hasNextPage = hasNextPage(currentPage, i|2Q}$3t2
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totalPage); ` bg{\ .q
boolean hasPrePage = hasPrePage(currentPage); |D<~a(0
xvW+;3;
returnnew Page(hasPrePage, hasNextPage, '\\J95*`
everyPage, totalPage, 0Uybh.dC
currentPage, ty"k
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beginIndex); ^6obxwVG
} 0t<TZa]V
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privatestaticint getEveryPage(int everyPage){ bhFzu[B
return everyPage == 0 ? 10 : everyPage; o05) I2
} WSh+5](:
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privatestaticint getCurrentPage(int currentPage){ J%%nv5y
return currentPage == 0 ? 1 : currentPage; 6W$k^<S
} F+}MW/ra@
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privatestaticint getBeginIndex(int everyPage, int =>ignoeI
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currentPage){ j]kx~
return(currentPage - 1) * everyPage; 2vK{Yw
} i)eub`uMy
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privatestaticint getTotalPage(int everyPage, int <<[`;"CF
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totalRecords){ P=V~/,>SZ!
int totalPage = 0; rs<UWk<q
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if(totalRecords % everyPage == 0) <b{ApsRJf
totalPage = totalRecords / everyPage; }yXa1#3
else k(V#{
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totalPage = totalRecords / everyPage + 1 ; S3.Pqp_<
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return totalPage; )5p0fw
} qy.Mi{=~:
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privatestaticboolean hasPrePage(int currentPage){ M$|^?U>cm
return currentPage == 1 ? false : true; #lF8"@)a-$
} s,lrw~17
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privatestaticboolean hasNextPage(int currentPage, St'3e<
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int totalPage){ `a
return currentPage == totalPage || totalPage == zQ5'q
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0 ? false : true; \z0"
} ~-|K5
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} t13wQt
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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。 f)/Yru. ;
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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 1iig0l6\m
#r>
做法如下: D&: