Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 F$kiSjh9aJ
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Fi\)ka\u
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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 61OlnmvE
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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 }1+2&Ps50
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。 \F\7*=xk
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分页支持类: .h4Z\R`
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java代码: g2'K3e?.%
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package com.javaeye.common.util; )=x4+)9
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import java.util.List; [fb9;,x`
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publicclass PaginationSupport { )hoVB
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publicfinalstaticint PAGESIZE = 30; $vYy19z
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privateint pageSize = PAGESIZE; KM"?l<x0Y
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privateList items; '"rm66
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privateint totalCount; b E40^e
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privateint[] indexes = newint[0]; F{.g05^y
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privateint startIndex = 0; /l3Oi@\
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public PaginationSupport(List items, int "[7'i<,AI
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totalCount){ -~4kh]7%
setPageSize(PAGESIZE); 2e3AmR@*
setTotalCount(totalCount); w
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setItems(items); 42-T&7k
setStartIndex(0); f(!cz,y^\*
} p-rQ'e
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public PaginationSupport(List items, int ",,.xLI7
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totalCount, int startIndex){ `022gHYv
setPageSize(PAGESIZE); +u\w4byl
setTotalCount(totalCount); +ek6}f#
setItems(items); }NdLd!
setStartIndex(startIndex); |o(te
} f.oY:3h:
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public PaginationSupport(List items, int UCFFF%
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totalCount, int pageSize, int startIndex){ l^}5PHLd
setPageSize(pageSize); K>XZrt
setTotalCount(totalCount); J#iuF'%Ds
setItems(items); wq1s#ag<
setStartIndex(startIndex); ^(7l!
} Fy$C._C$
]; g~)z
publicList getItems(){ QqBQ[<_
return items; <pS#wTsN4%
} wnLpf
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publicvoid setItems(List items){ 8(S|=c R
this.items = items; 0%IZ -])
} \RFA?PuY
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publicint getPageSize(){ &f?JtpB
return pageSize; NxK.q)tj6
} HAs/f#zAk6
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publicvoid setPageSize(int pageSize){ |N
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this.pageSize = pageSize; gS]
} 7M?Sndp$
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publicint getTotalCount(){ @j%@Z
return totalCount; >Apa^Bp
} 4ISIg\:c*
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publicvoid setTotalCount(int totalCount){ H&k&mRi
if(totalCount > 0){ G'nSnw
this.totalCount = totalCount; 0XyPG
int count = totalCount / \lDh"
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pageSize; I,&
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if(totalCount % pageSize > 0) d$?+>t/
count++; HFz;"s3lWM
indexes = newint[count]; BI!E mA
for(int i = 0; i < count; i++){ H,j_2JOY=
indexes = pageSize * ]f wW
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} #X'su`+
}else{ 3qV\XC+
this.totalCount = 0; 37M,Os1(
} ']OT7)_
} mfDt_Iq
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publicint[] getIndexes(){ ke/4l?zs
return indexes; eU]I !pI<
} PBiA/dG[;
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publicvoid setIndexes(int[] indexes){ ~ySsv
this.indexes = indexes; ZR{YpLFQ
} Lo}/k}3Sx
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publicint getStartIndex(){ 6D{70onY+
return startIndex; *$1F|G
} X>]<rEh
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publicvoid setStartIndex(int startIndex){ 2:yXeSeA
if(totalCount <= 0) X1V~.kvt)
this.startIndex = 0; nKTi"2dm
elseif(startIndex >= totalCount) a785xSUV
this.startIndex = indexes Wm)Id_
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[indexes.length - 1]; Un5 AStG
elseif(startIndex < 0) AkO-PL
this.startIndex = 0; &{q'$oF
else{ }XCh>LvX
this.startIndex = indexes 8#1o
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[startIndex / pageSize]; Sm|TDH
} Upg8t'%{op
} n+vv
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publicint getNextIndex(){ 7.kH="@
int nextIndex = getStartIndex() + $8[JL\
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pageSize; PdRDUG{Jy
if(nextIndex >= totalCount) L,,*8
return getStartIndex(); |0_5iFAB|
else E?Qg'|+_
return nextIndex; YnCuF0>
} lf R}cx
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publicint getPreviousIndex(){ V*@&<x"E
int previousIndex = getStartIndex() - ZHj7^y@P
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pageSize; zMO xJ
if(previousIndex < 0) '68#7Hs.
return0; ;^)4u
else [V5,1dmkI
return previousIndex; =xb/zu(
} IiX2O(*ZE
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} 9wdX#=I
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抽象业务类 Kc>Rd
java代码: p DU+(A4>
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/** |n(b>.X
* Created on 2005-7-12 #!r>3W&
*/ /c7jL4oD
package com.javaeye.common.business; (^<skx>
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import java.io.Serializable; N)KN!!
import java.util.List; kn&BGYt
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import org.hibernate.Criteria; Qv8 =CnuOT
import org.hibernate.HibernateException; W{ZJ^QAq/
import org.hibernate.Session; )E6E}
import org.hibernate.criterion.DetachedCriteria; }L^PZS@Jf
import org.hibernate.criterion.Projections; aHNn!9#1
import +.*=Fn22
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org.springframework.orm.hibernate3.HibernateCallback; =:H EF;!
import tS,AS,vy]
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org.springframework.orm.hibernate3.support.HibernateDaoS <DEu]-'>
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upport; 8N4E~*>C
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import com.javaeye.common.util.PaginationSupport; SzUH6|=.R=
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public abstract class AbstractManager extends ?|n @%'
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HibernateDaoSupport { >V>GiSni
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privateboolean cacheQueries = false; vJb/.)gh]
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privateString queryCacheRegion; [Z!oVSCZD%
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publicvoid setCacheQueries(boolean W"tGCnd
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cacheQueries){ shVEAT'`
this.cacheQueries = cacheQueries; 5`::#[
} }=u#,nDl>$
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publicvoid setQueryCacheRegion(String q$}gQ9'z'
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queryCacheRegion){ OM@z5UP
this.queryCacheRegion = o9OCgP`Y
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queryCacheRegion; 9]I{GyH
} mCQ:<#
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publicvoid save(finalObject entity){ NpS =_QeNw
getHibernateTemplate().save(entity); <J.q[fd1*
} (Hs,Tj
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publicvoid persist(finalObject entity){ 6Z@T
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getHibernateTemplate().save(entity); \[wbJ
} hXD/
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publicvoid update(finalObject entity){ <s'0<e!./t
getHibernateTemplate().update(entity); 65rf=*kz:
} Mh@n>+IR
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publicvoid delete(finalObject entity){ s Dsq:z
getHibernateTemplate().delete(entity); nrbP3sf*
} d$n<^~Z
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publicObject load(finalClass entity, RE08\gNIt
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finalSerializable id){ C)%qs]
return getHibernateTemplate().load s&\krW&
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(entity, id); fC$@m_-KD
} cPg{k}9Tvy
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publicObject get(finalClass entity, 5>~D3?IAd
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finalSerializable id){ ^szi[Cj
return getHibernateTemplate().get lZ)
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(entity, id); KD--w(4
} `A8ErfA
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publicList findAll(finalClass entity){ iMQ0Sq-%1
return getHibernateTemplate().find("from ,MG`}*N}
}R_Rw:W
" + entity.getName()); *0<)PJ T
} F]s:`4
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publicList findByNamedQuery(finalString `dRqheX
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namedQuery){ uhB
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return getHibernateTemplate X<g
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().findByNamedQuery(namedQuery); 4EaxU !BT
} ieXi6^M$
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publicList findByNamedQuery(finalString query, 'UC1!Z
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finalObject parameter){ bo@,
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return getHibernateTemplate -]QP#_
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().findByNamedQuery(query, parameter); CW]Th-xc
} @R (Op|9
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publicList findByNamedQuery(finalString query, Q&/WVRD
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finalObject[] parameters){ R 'fEw3^
return getHibernateTemplate QH?sx k2
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().findByNamedQuery(query, parameters); FwD
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} ^$[iLX
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publicList find(finalString query){ Rgl cd
return getHibernateTemplate().find [.&n,.k
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(query); h67{qY[J[
} n+nZ;GJ5d
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publicList find(finalString query, finalObject (B!DBnq
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parameter){ '~1Zr uO
return getHibernateTemplate().find &2I8!Ia
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(query, parameter);
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} 6;;2e> e
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public PaginationSupport findPageByCriteria d ,.=9
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(final DetachedCriteria detachedCriteria){ w(K|0|t
return findPageByCriteria SwM=?<
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); %P:|B:\<
} ?TI]0)
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public PaginationSupport findPageByCriteria {CNJlr@z
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(final DetachedCriteria detachedCriteria, finalint 6?[SlPPE1
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startIndex){ ngI+afo
return findPageByCriteria "<^n@=g'q
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(detachedCriteria, PaginationSupport.PAGESIZE, JVr8O`>T
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startIndex); WZh_z^rwn
} y,w_x,m
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public PaginationSupport findPageByCriteria =d]}7PO~
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(final DetachedCriteria detachedCriteria, finalint ixE w!t
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pageSize, 6\`8b&'n
finalint startIndex){ [(&aVHUj
return(PaginationSupport) qk(bA/+e
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getHibernateTemplate().execute(new HibernateCallback(){ $\bVu2&I
publicObject doInHibernate VN'\c3;
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(Session session)throws HibernateException { NytodVZ'3
Criteria criteria = R~fk/T?
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detachedCriteria.getExecutableCriteria(session); q03+FLEfC
int totalCount = q?@*
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((Integer) criteria.setProjection(Projections.rowCount \&ki79Ly-
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()).uniqueResult()).intValue(); 8=zREt<Se
criteria.setProjection oXN(S:ZF
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(null); 3i'01z
List items = #z7yoP
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criteria.setFirstResult(startIndex).setMaxResults 5?([jAOf
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(pageSize).list(); Cpy&2o-%v
PaginationSupport ps = 4jZB%tH
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new PaginationSupport(items, totalCount, pageSize, F^S]7{
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startIndex); 4=;j.=>0X
return ps; {TdxsE>
} 1LAd5X
}, true); !hHX8TD^J
} 0,Ib74N'w
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public List findAllByCriteria(final .GL@`7"
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DetachedCriteria detachedCriteria){ `"<hO
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return(List) getHibernateTemplate lP*=4Jh
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().execute(new HibernateCallback(){ 99CK [G
publicObject doInHibernate [IAk9B.\
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(Session session)throws HibernateException { y`
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Criteria criteria = \sfc!5G
'> n&3`r5
detachedCriteria.getExecutableCriteria(session); 0CK
return criteria.list(); *c&OAL]
} LZ.Xcy
}, true); `!(%Rk
} aw~h03R_Z
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public int getCountByCriteria(final d|9]E&;,
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DetachedCriteria detachedCriteria){ ,2+d+Zuh
Integer count = (Integer) -Fu,oEj{*
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getHibernateTemplate().execute(new HibernateCallback(){ xXa4t4gR
publicObject doInHibernate z;Fz3s7
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(Session session)throws HibernateException { dqo-.,=
Criteria criteria = 1~3dX[&
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detachedCriteria.getExecutableCriteria(session); ;Bj&9DZd
return `'k2gq&
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criteria.setProjection(Projections.rowCount r;*
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()).uniqueResult(); cAot+N+9|]
} Un,'a8>V`
}, true); udIm}jRA"
return count.intValue(); -.ZP<,?@F
} \Q1&w2mw
} .:B>xg~2
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用户在web层构造查询条件detachedCriteria,和可选的 w/rJj*
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }Nwp{["}]L
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PaginationSupport的实例ps。 yjH'<
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ps.getItems()得到已分页好的结果集 jYFmL_{
ps.getIndexes()得到分页索引的数组 t u{~:Z(
ps.getTotalCount()得到总结果数 ?!/8~'xA6
ps.getStartIndex()当前分页索引 =Y6W
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ps.getNextIndex()下一页索引 '5[(QM5Gi&
ps.getPreviousIndex()上一页索引 47Bg[
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 RWo7_X O
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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 9p3~WA/M@
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一下代码重构了。 aX6}:"R2C
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我把原本我的做法也提供出来供大家讨论吧: >~Tn%u<
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首先,为了实现分页查询,我封装了一个Page类: G/~gF7
java代码: % XZ&(
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/*Created on 2005-4-14*/ &z:bZH]DH
package org.flyware.util.page; 92A9gY
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/** 2;s[ m3
* @author Joa JoiGuZd>
* ]&q<O0^'
*/ \4G9YK-N>
publicclass Page { (l-=/6-
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/** imply if the page has previous page */ |3!)
privateboolean hasPrePage; ha=2isq
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H3}
/** imply if the page has next page */ ryh"/lu[B
privateboolean hasNextPage; oVn&L*H
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/** the number of every page */ nK?S2/o#A
privateint everyPage; C~@m6K
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/** the total page number */ H)gc"aRe;Y
privateint totalPage; E?P>s T3B
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/** the number of current page */ 3Wv^{|^
privateint currentPage; n5.sx|bI?
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/** the begin index of the records by the current >c<xy>N
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query */ ./Ek+p*96H
privateint beginIndex; 0 D
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/** The default constructor */ oe
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public Page(){ QkD
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} /(hTk&
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/** construct the page by everyPage !3k-' ),z&
* @param everyPage {4Kvr4)4
* */ .<z7$lz\
public Page(int everyPage){ `NgQ>KV!
this.everyPage = everyPage; _LC*_LT_
} v G\J8s
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/** The whole constructor */ 7I"~a<f0X`
public Page(boolean hasPrePage, boolean hasNextPage, `pZX!6Wn
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int everyPage, int totalPage, !ae?EJm"
int currentPage, int beginIndex){ tJ >>cFx
this.hasPrePage = hasPrePage; !o_eK\p
this.hasNextPage = hasNextPage; Q*ELMib
this.everyPage = everyPage; w->Y92q]
this.totalPage = totalPage; ,
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this.currentPage = currentPage; s=jYQ5nv
this.beginIndex = beginIndex; $9Bzq_!
} i({\fb|0
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/** md'wre3
* @return a@W9\b@I
* Returns the beginIndex. \ Voly
*/ 0q-lyVZ^X
publicint getBeginIndex(){ 7>O`UT<t4@
return beginIndex; 8uLS7\,$z
} 8&"Jlz
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/** ZZo<0kDk
* @param beginIndex jF}kV%E
* The beginIndex to set. g%S/)R,,ct
*/ 7:uz{xPK6
publicvoid setBeginIndex(int beginIndex){ a4~B
this.beginIndex = beginIndex; 1Xm>nF~
} _1G/qHf^S
&k}B66
/** >(igVaZ>
* @return
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* Returns the currentPage. U~7udUR
*/ L@AFt)U
publicint getCurrentPage(){ J.4U;A5
return currentPage; ]9/A=p?J@
} 8YlZ({f
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/** 1aRTvaGo
* @param currentPage W&
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* The currentPage to set. +O 7(
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*/ ;#v3C;
publicvoid setCurrentPage(int currentPage){ +39uKOrZ
this.currentPage = currentPage; zM&ro,W
} :AztHf?X
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/** i]k)wr(
* @return /}U)|6-B
* Returns the everyPage. eQ/w
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*/ #n|5ng|CJ
publicint getEveryPage(){ =oL:|$Pj
return everyPage; PL$XXj>|:
} N}B&(dJ
#9DJk,SP
/** hui
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* @param everyPage n)q8y0if
* The everyPage to set. 0:[A4S`X
*/ L
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publicvoid setEveryPage(int everyPage){ #1'q'f:7&
this.everyPage = everyPage; C$+Q,guM
} 0O`Rh"O
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;
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/** c{y'&3\
* @return |f$+|9Q?
* Returns the hasNextPage. a}NB6E)-
*/ !vu-`u~86
publicboolean getHasNextPage(){ Kj
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return hasNextPage; "*X\'LPs=
} g{}<ptx]
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/** E<3xv;v8r
* @param hasNextPage `0]N#G
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* The hasNextPage to set. GZrN,M
*/ RNB&!NC
publicvoid setHasNextPage(boolean hasNextPage){ r7R'beiH
this.hasNextPage = hasNextPage; z3S"1L7
} =h-EN_[
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/** /FXvrH(
* @return F6yFKNK!n
* Returns the hasPrePage. pIK:$eN!/
*/ fG>3gS6&
publicboolean getHasPrePage(){ *Ts$Hj[
return hasPrePage; "QXnE^
} kK4a;j.#
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/** >e6 OlIW
* @param hasPrePage ]h`*w
* The hasPrePage to set. 18F}3t??
*/ q9ra
publicvoid setHasPrePage(boolean hasPrePage){ 5"57F88Y1
this.hasPrePage = hasPrePage; +5|k#'%5
} PV~D;
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/** OjlX<y.
* @return Returns the totalPage. E%v0@
* [nV BnB
*/ sv%E5@
publicint getTotalPage(){ 5<PNl~0
return totalPage; Sq,>^|v4&e
} #b428-
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/** xP_%d,
* @param totalPage c;q=$MO`
* The totalPage to set. @u/CNx,`X
*/ 9;{(.K
publicvoid setTotalPage(int totalPage){ c8mh#Tbl
this.totalPage = totalPage; .gC.T`/m
} | VaJ70\o
3^
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} _p: n\9k
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 dI%jR&.e;
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个PageUtil,负责对Page对象进行构造: em,1Yn?
java代码: d*Mqs}8
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/*Created on 2005-4-14*/ Yn [
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package org.flyware.util.page; {c3FJ5:
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import org.apache.commons.logging.Log; aG;F=e
import org.apache.commons.logging.LogFactory; H:hM(m0?q
w`8H=Hf
/** -V4{tIQY
* @author Joa qVfn(rZ
* HM)D/CO,?
*/ b6k_u9m^E
publicclass PageUtil { @R`6jS_gK
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privatestaticfinal Log logger = LogFactory.getLog E@k'uyIu
`!N}u
(PageUtil.class); ? Pi|`W
5%9Uh'y#
/** Go c*ugR
* Use the origin page to create a new page %.`u2'^
* @param page a_S`$(7k
* @param totalRecords &Cj~D$kDEu
* @return S[$9_J f
*/ _PPC?k{z!
publicstatic Page createPage(Page page, int I^f|U
{"~[F 2qR
totalRecords){ &S+*1<|`K
return createPage(page.getEveryPage(), z6J12tu
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page.getCurrentPage(), totalRecords); $#n9C79Z@
} RjviHd#DXn
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/** :^`j:B
* the basic page utils not including exception n6Uh%rO7S|
c3l(,5DtH
handler &uE )Vr4 R
* @param everyPage )! rD&l$tE
* @param currentPage /y{fDCC
* @param totalRecords Ws3z-U>j
* @return page p2l@6\m\
*/ \; '#8
publicstatic Page createPage(int everyPage, int ejR$N!LL
+-;v+{
currentPage, int totalRecords){ qh6b;ae\x
everyPage = getEveryPage(everyPage); r1IvA^X
currentPage = getCurrentPage(currentPage); *jc
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int beginIndex = getBeginIndex(everyPage, -:d{x#
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currentPage); |Tmug X7
int totalPage = getTotalPage(everyPage, J&h59dm-
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totalRecords); vgtAJp+p*
boolean hasNextPage = hasNextPage(currentPage, ;sYDs71y
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totalPage); ulN1z
boolean hasPrePage = hasPrePage(currentPage); 1t/c@YUTy
XN
t` 4$L
returnnew Page(hasPrePage, hasNextPage, Q?j '4
everyPage, totalPage, 0&NM=~
currentPage, R?lTB3"
l[5** ?#
beginIndex); <astIu Au
} Z)xcxSo
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privatestaticint getEveryPage(int everyPage){ 9:RV5Dt
return everyPage == 0 ? 10 : everyPage; -tWxBGSa@
} : I";&7C
mp sX4
privatestaticint getCurrentPage(int currentPage){ 2l V`UIa
return currentPage == 0 ? 1 : currentPage; L=Aj+
} r*mYtS
2Q(ZW@0
privatestaticint getBeginIndex(int everyPage, int :n~Mg{j3
l<=k#d
currentPage){ N4VZl[7?
return(currentPage - 1) * everyPage; X(d:!-_m *
} /o$6"~t
xG
edY*[`
privatestaticint getTotalPage(int everyPage, int GBg
Iw?^
totalRecords){ +ah4 K(+3
int totalPage = 0; 3C=QWw?
dMjQV&
if(totalRecords % everyPage == 0) t4;gY298
totalPage = totalRecords / everyPage; ={o4lFe3v(
else {c?{M.R
totalPage = totalRecords / everyPage + 1 ; ^|h_[>
2.);OFk+
return totalPage; 7?k3jDK
} MTE1\,
1=+S'_j
privatestaticboolean hasPrePage(int currentPage){ *dB3Gu{
+
return currentPage == 1 ? false : true; 9b-4BON{P
} %<Qv?`B
&=%M("IlD
privatestaticboolean hasNextPage(int currentPage, ;A"i.:ZT
q2B'R
int totalPage){ !Y UT*
return currentPage == totalPage || totalPage == Q rSO%Rm1*
h
Ks
0 ? false : true; K(MZ!>{
}
`_neYT
G~&q
:G9d,B7*
} \[]BB5)8
jsV1~1:83
K-*ZS8
(mi=I3A(
lv.h?"Ml
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。 15|gG<-
"3 2Ua3m:G
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 WQw11uMt@q
r#ADxqkaV
做法如下: qS}{O0
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 1$}Tn
]x& R=)P
的信息,和一个结果集List: \mb@-kM)
java代码: ;/23CFYM
}|=Fnyj
K43`$
/*Created on 2005-6-13*/ S9b=?? M)
package com.adt.bo; 7PfNPz<4+
a&mL Dh/
import java.util.List; [UdJ(cGf
t]3:vp5N]
import org.flyware.util.page.Page; 3,#qt}8`
S>HfyZ&Pc
/** _q-k1$o$
* @author Joa I L&PN`#
*/ Bz,Xg-k+
publicclass Result { Y>nQ<
4|jPr J
private Page page; 4rCw#mVtB
|l|$Q;
private List content; A$P Oc<
a(-t"OL\
/** |t$%kpp
* The default constructor [8DPZU@
*/ - sq=|
public Result(){ (S=CxK
super(); ffOV7Dxy
} 'UCClj;?K
gz:US77
/** {c
$8?6
* The constructor using fields *m&'6qsS
* qvh8~[
* @param page M6Ik 'r"M
* @param content |D;I>O^"R
*/ : 9>U+)%
public Result(Page page, List content){ Oeg^%Y
this.page = page; .nA9irc
this.content = content; PGTjOkx
} bI;u};v
=':SOO7
/** oC!z+<
* @return Returns the content. wUS w9xg
*/ }&l%>P
publicList getContent(){ dZd]p8
return content; ?|hYtV
} [].euDrX
RbA.&=3
/** 8X\":l:
* @return Returns the page. (f"LD8MJ/
*/ L1SZutWD?
public Page getPage(){ )5diX
+
k
return page; IS{>(XT{
} JAmpU^(C
</Dv?
/** kf' 4C
"}
* @param content 0}>p)k3&A
* The content to set. 2tp95E`(O
*/ *2m{i:3
public void setContent(List content){ <{HV|B7
this.content = content; wX@g>(
} ~P-^An^
8hX/~-H
/** SmP&wNHQf
* @param page c`)[-
* The page to set. k#5Qwxu`
*/ &x[V<Gq
publicvoid setPage(Page page){ :{#w-oC>6P
this.page = page; a0wpsl
iF
} vWYU'_=
} jpiBHi]5+
EBUCG"e
FbD9G6h5
NrcxuItkYn
t8#u}u
2. 编写业务逻辑接口,并实现它(UserManager, +=L^h9F
<)oW
UserManagerImpl) m8 *)@e
java代码: AHP;N6Y6
n--s[Kdo8
[:{HX U7y
/*Created on 2005-7-15*/ U,\t2z
package com.adt.service; |198A,^
ZlL]AD@
import net.sf.hibernate.HibernateException; F^wm&:%{`
D'_w
*
import org.flyware.util.page.Page; 7}fT7tsN
HAcC& s8
import com.adt.bo.Result; g % 8@pjk
MF5o\-&dN
/** K@!Gs'Op
* @author Joa >s;dooZ
*/ 7Y1FFw|
publicinterface UserManager { GUvEOD=p
E$5A
1
public Result listUser(Page page)throws h`MTB!o
]M&KUgz
HibernateException; >yt8gw0J
=?1B|hdo
} ";w"dfC^
(5=B^9{R
_Qf310oONS
Y$eO:67;
lMb&F[KJ7
java代码: -=4:qQEw
WQltUaF
eh6=-
/*Created on 2005-7-15*/ `R_;n#3F0
package com.adt.service.impl; iq`caoi
5}'W8gV?
import java.util.List; Nb/Z +
~d=Y98'xS
import net.sf.hibernate.HibernateException; a`; nB E
2fMKS
import org.flyware.util.page.Page; S,qEKWyLd
import org.flyware.util.page.PageUtil; jtQ}
_h P7hhR
import com.adt.bo.Result; mqoB]H,
import com.adt.dao.UserDAO; nW_cjYS%
import com.adt.exception.ObjectNotFoundException; \2y[Hy?
import com.adt.service.UserManager; LVBE+{P\5?
)SWLX\b
/** w@hbY:Z9z
* @author Joa K\^S>dV
*/ .]K{8[:hq
publicclass UserManagerImpl implements UserManager { 5P![fX|5
v4X)R
"jJ
private UserDAO userDAO; yz^Rm2$f9
mW 'sdb
/** @*5(KIeeC>
* @param userDAO The userDAO to set. /NFm6AA]
*/ !,JV<(7k
publicvoid setUserDAO(UserDAO userDAO){ HV8=b"D"
this.userDAO = userDAO; AP/#?
} ,^&amWey
->a|
/* (non-Javadoc) Ox&]{
* @see com.adt.service.UserManager#listUser 8QFg6#"O
{*K7P> &
(org.flyware.util.page.Page) *w23(f
*/ X~ g9TUv8
public Result listUser(Page page)throws %"BJW
QJtO~~-
HibernateException, ObjectNotFoundException { %@Nu{?I
int totalRecords = userDAO.getUserCount(); <,Pk
if(totalRecords == 0) .%+y_.l
throw new ObjectNotFoundException Q?{^8?7
&O^t]7
("userNotExist"); OH6-\U'.Z
page = PageUtil.createPage(page, totalRecords); }]|e0 w:
List users = userDAO.getUserByPage(page); 5T]dQ3[v4
returnnew Result(page, users); _.^`DP>
} fsUZG6
w'a3=_nW
} rE9Nt9}
S0!w]Ku
\JIyJ8FleC
p?'&P!
x5eSPF1
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 9}aEV 0 V|
Q4F&#^02y
询,接下来编写UserDAO的代码:
Jju^4
3. UserDAO 和 UserDAOImpl: o!W(
java代码: E{{Kzr2$
i@#=Rxp
}sW%i#CV
/*Created on 2005-7-15*/ ibh,d.*~g
package com.adt.dao; ]Yk)A.y
;]^% 6B n
import java.util.List; dnCurWjdk
.g!K| c
import org.flyware.util.page.Page; *b\&R%6dR
z2[{3Kd*
import net.sf.hibernate.HibernateException; y=SVS3D
1}3tpO;
/** `{9bf)vP6
* @author Joa |Jny0a/0
*/ YU/?AQg
publicinterface UserDAO extends BaseDAO { eR:C?v
W7"UhM
publicList getUserByName(String name)throws )w,<XJhg`
p;.M.
HibernateException; 0n*D](/NK
W}M3z
publicint getUserCount()throws HibernateException; V{n7KhN~Y!
D4$2'h
publicList getUserByPage(Page page)throws /o9
0O&
l;}3J3/qq]
HibernateException; W}@IUCRs
7R$O~R3p
} sq;3qbz
Y]bS=*q
zV8{|-2]No
PP8627uP
%F13*hOu
java代码: z['2
~,.'#=V
)
(0=w4
/*Created on 2005-7-15*/ DqHJ *x4
package com.adt.dao.impl; pKaU
[1x?%
USZBk0$
import java.util.List; OxN[w|2\4
2=uwGIF
import org.flyware.util.page.Page; 0G`@^`
/h9v'Y}c
import net.sf.hibernate.HibernateException;
@W-0ybv
import net.sf.hibernate.Query; C%H?vrR
afE)yu`
import com.adt.dao.UserDAO; $N\k*=
8&yI1XM|
/** UT0}Ce>e
* @author Joa GI6]Ecc
*/ B[9y<FB+
public class UserDAOImpl extends BaseDAOHibernateImpl LZ RP}|
K%1`LT5:~
implements UserDAO { ehTv@2b
0X5b32
/* (non-Javadoc) K
#}t\
* @see com.adt.dao.UserDAO#getUserByName /h8100
r+;k(HMY}[
(java.lang.String) iP6?[pl8
*/ NuW6~PV
publicList getUserByName(String name)throws hR~&}sxN
]A%~bQ7
HibernateException { \}W !
String querySentence = "FROM user in class Z"$iB-]
)YW"Zo8~!1
com.adt.po.User WHERE user.name=:name"; Wg,7k9I
Query query = getSession().createQuery pfHfw,[
.q1y)l-^Z
(querySentence); %<fs \J^k
query.setParameter("name", name); >R5A@0@d5
return query.list(); 8Oz9 UcG
} ,0{x-S0jX<
<<R2
X1
/* (non-Javadoc) w |abaMam
* @see com.adt.dao.UserDAO#getUserCount() 7^tYtMm|U
*/ YdyTt5-
publicint getUserCount()throws HibernateException { $gZiW 8
int count = 0; =\G`g#
String querySentence = "SELECT count(*) FROM ~RLWr.pK
NxnaH!wS
user in class com.adt.po.User"; WyRSy-{U(}
Query query = getSession().createQuery H!'4A&
F}=_"IkZ
(querySentence); F)4I70vG
count = ((Integer)query.iterate().next L7R!,
'KDt%?24
()).intValue(); >Y(JC#M;
return count; 6|IJwP^Q_
} EP^qj j@M
-[}Aka,f!
/* (non-Javadoc) #8zC/u\`=
* @see com.adt.dao.UserDAO#getUserByPage (,KzyR=*'
e ?FQ6?
(org.flyware.util.page.Page) &hrMpD6z6i
*/ +\$c_9|C+
publicList getUserByPage(Page page)throws X *EseC
*,t/IA|
HibernateException { AN3oh1xe:
String querySentence = "FROM user in class suE8"v!sk
[5ncBY*A7
com.adt.po.User"; uQ|LkL%<^
Query query = getSession().createQuery 4ETHaIiWp
TU':Rt
(querySentence); {{?MO{Mh*
query.setFirstResult(page.getBeginIndex()) |=07n K2
.setMaxResults(page.getEveryPage()); 9MH;=88q
return query.list(); "U+c`V=w
} (<rE1w2s:
<v/aquLN
} :,fT^izew
fefy`J
wE"lk
$B7c\MR
j
|}UA=? Xl
至此,一个完整的分页程序完成。前台的只需要调用 KDP"z
N;,zPW a
userManager.listUser(page)即可得到一个Page对象和结果集对象 R !yh0y}Z
)_\ ;l%&
的综合体,而传入的参数page对象则可以由前台传入,如果用 W?"l6s
Pm%5c\ef
webwork,甚至可以直接在配置文件中指定。 bDudETl
[+QyKyhTO
下面给出一个webwork调用示例: J5n6K$.d
java代码: |?ZU8I^vW
ycSGv4
)
Ijap%l1I
/*Created on 2005-6-17*/ fj/L)i
package com.adt.action.user; crOSr/I$
%@)R
import java.util.List; T+aNX/c|>
$gN\%X/n"1
import org.apache.commons.logging.Log; 4_ypFuS ^
import org.apache.commons.logging.LogFactory; [VqiF~o,
import org.flyware.util.page.Page; Wp+lI1t
I?E+
import com.adt.bo.Result; 8)>T>-os
import com.adt.service.UserService; EZ:?
(|h
import com.opensymphony.xwork.Action; x2a
?ugQ
S=lCzL;j"
/** [PB73q8
* @author Joa IZm6.F
*/ `"PHhCG+z
publicclass ListUser implementsAction{ L)&^Pu
Z,/^lg c,
privatestaticfinal Log logger = LogFactory.getLog l1|*(%p?X
q'a]DJ`
(ListUser.class); U;TS7A3
|vm-(HY!
private UserService userService; jSM`bE+"
OI*ltba?
private Page page; *aC[Tv[-P
[s`B0V`04
privateList users; QlV(D<
bCr
W'}:de
/* 6P}?+ Gc
* (non-Javadoc) ~k-'
* %rJDpB{
* @see com.opensymphony.xwork.Action#execute() @*~yVV!5
*/ A,t g268
publicString execute()throwsException{ J[r_ag
Result result = userService.listUser(page); l)o!&]2
page = result.getPage(); GD)paTwO<
users = result.getContent(); ,YjjL
return SUCCESS; (gPB@hAv
} B~k{f}
'3U,UD5EG
/** )B+o
F7
* @return Returns the page. $GU s\
*/ ("PZ!z1m1
public Page getPage(){ 9M'"q7Kh
return page; R-dv$z0
} QIU%!9Y
rqiH!R
/** =OtW!vx#R.
* @return Returns the users. pfIK9>i
*/ xzOvc<u
publicList getUsers(){ A'7Y{oPHX
return users; $H.U ~
} WRkuPj2
\p(0H6
/** BeQ'\#q,
* @param page Ix,b -C~
* The page to set. N0}[&rE 8
*/ "%+||IyW
publicvoid setPage(Page page){ 4[gbRn'
this.page = page; ":
BZZ\!
} R!7--]Wcg
<dE~z] P
/** 0sKoNzE
* @param users [ ^\{>m7
* The users to set. T+~&jC:{
*/ aM1WC 'c&)
publicvoid setUsers(List users){ Qj1%'wWG
this.users = users; Lg,ObVt!
} 0PFC%x
D4(73
/** #K@!jh)y^
* @param userService LgX2KU"
* The userService to set. 8YE4ln
*/ YU0pWM
publicvoid setUserService(UserService userService){ Iurz?dt4w
this.userService = userService; BR?DW~7J j
} W^Fkjqpv
} fV7
k {dR
2?Ryk`2i)
p=eSJ*
"k
;nbEV2Y<
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, e@vZg8Ie
IcQpbF0
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 4IB`7QJq
9;vES^
么只需要: i$3#/*Y7_L
java代码: jqj}j2
9
}*%=C!m4R!
+/%4E %
<?xml version="1.0"?> Pq35w#`!
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork _X<V`,
p
5>CeFy
1.0//EN" "http://www.opensymphony.com/xwork/xwork- --TH6j"
n%;t Va
1.0.dtd"> g(s}R ?
{Fyw<0 [@
<xwork> s2QgR37s>
~Ni-}p
<package name="user" extends="webwork- Wt!;Y,1s
imwn)]L R
interceptors"> knHrMD;
!IC
.0I`
<!-- The default interceptor stack name H&F2[ j$T
xDekC~Zq
--> Bqa_l|
<default-interceptor-ref 'cQ`jWZQ
Sjwwc6_c
name="myDefaultWebStack"/> _}']h^@Z
Gv 8Z
<action name="listUser" +|+fDQI
0L"uU3
class="com.adt.action.user.ListUser"> yJqDB$0
<param I 6<LKI/
R*W1<W%q=
name="page.everyPage">10</param> wV$V X
<result P&5vVA6K7
s:,fXg25J
name="success">/user/user_list.jsp</result> GO][`zZJ]
</action> XM?c*,=fu
p((. (fx
</package> Cx(HsJ!,
JPT&!%~
</xwork> U'5p;j)_
!{uV-c-5,
F3Vvqt*2
U;.cXU{
DX3jE p2
2%fkXH<
这样就可以通过配置文件和OGNL的共同作用来对page对象设置初值 [vY)y\W{
p"cY/2w:j
了。并可以通过随意修改配置文件来修改每页需要显示的记录数。 l`0JL7
ao2o!-?!t
注:上面的<param>的配置,还需要webwork和Spring整合的配合。 GLV`IkU %
T_)+l)
r`u 9MJ*
!
c~3 `7v
j.c4
我写的一个用于分页的类,用了泛型了,hoho flBJO.2
ih:%U
java代码: j}jU.\*v<
+'` ^ N
ND 8;1+3
package com.intokr.util; b_~KtMO
'e
x/IqbK
import java.util.List; H0.&~!,*
l$!NEOK
/** =<=[E:B
* 用于分页的类<br> )In;nc
* 可以用于传递查询的结果也可以用于传送查询的参数<br> G
jrN1+9=
* ?f:\&+.&
* @version 0.01 j=>WWlZ
* @author cheng dwzk+@]8
*/ V+*1?5w
public class Paginator<E> { kwt;pxp i
privateint count = 0; // 总记录数 )OGO
wStz
privateint p = 1; // 页编号 "bO]AG
privateint num = 20; // 每页的记录数 GCcSI;w
privateList<E> results = null; // 结果 J/ vcP
8Waic&lX~
/** Z>@\!$Mc
* 结果总数 6XVJ/qZ
*/ u`*$EP-%
publicint getCount(){ c/3]M>+M
return count; ?* dfIc
} $~A\l@xAG
e7U9"pk
publicvoid setCount(int count){ gp{P _
this.count = count; mA3yM#
} hJ Jo+NNN
FFF7f 5F
/** $:D hK
* 本结果所在的页码,从1开始 zjx'nK{eI
* P'Jb')m
* @return Returns the pageNo.
bqR0./V
*/ iF+50d
publicint getP(){ 1
7hXg"B
return p; 0L7^Vr)
} D4GXZX8K
jB d9
$`
/** :4238J8
* if(p<=0) p=1 ."v&?o
Ck]
* ou&7v<)x4
* @param p n ZS*"O#L
*/ gi\UNT9x
publicvoid setP(int p){ K9'AYFse
if(p <= 0) hN:2(x
p = 1; 2 BwpxV8
this.p = p; v|>'m#Ln2
} jZ69sDhE
qjvIp-
/** B;L^!sLP
* 每页记录数量 2)
A$bx
*/ H*dQT y,
publicint getNum(){ /#?i +z
return num; \V<deMb=
} NslaG
v*e=oyx[
/** Hn(L0#Oqy
* if(num<1) num=1 }*0*8~Q'5
*/ Yr+ghl/ V
publicvoid setNum(int num){ +wr
5&
if(num < 1) af7\2g3*
num = 1; ~E7=c3:"
this.num = num; r+Y]S-o:
} 8,(5Q
tZY(r
{
/** wsfn>w?!V
* 获得总页数 q|ZQsFZ
*/ ^S`c-N
publicint getPageNum(){ Ibl==Irk
return(count - 1) / num + 1; j6$_U@)%O
} !Lj+&D|z
[k6 5i
/** })r[qsv
* 获得本页的开始编号,为 (p-1)*num+1 ='r4zz
*/ E)l@uPA'1
publicint getStart(){ nbz?D_
return(p - 1) * num + 1; Rs%6O|u7
} {mV,bg,}~
c7N`W}BZ
/** T\Q)"GB
* @return Returns the results. 8/E?3a_g-
*/ xo_Es?
publicList<E> getResults(){ E%+1^
L
return results; l4Y}<j\;
} =zW.~(c{
niN$!k+Jr
public void setResults(List<E> results){ )Ikx0vDFQ
this.results = results; ^?tF'l`
} >U$,/_uMNW
[&FWR
public String toString(){ M0% ):P?x
StringBuilder buff = new StringBuilder xpVYNS{c+|
/ZKO\q
(); ~A=Z/46*Z
buff.append("{"); ;HaG-c</
buff.append("count:").append(count); O ijG@bI8
buff.append(",p:").append(p); l*yJU3PW
buff.append(",nump:").append(num); L$FLQyDR
buff.append(",results:").append r0\cgCn
~3 z10IG
(results); eq\{*r"DCK
buff.append("}"); O-vvFl#4
return buff.toString(); kST
} R:v`\
"I]% aK0
} yeNC-U<
5ff66CRw
# 1,(I