Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 g+=f=5I3
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 m_UzmWF
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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 a6g+"EcH#'
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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 +VHoYEW
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分页支持类: _i0,?U2C
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java代码: )eBCO~HS
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package com.javaeye.common.util; 2}.EFQp+
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import java.util.List; o]0\Km
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publicclass PaginationSupport { /^Zgv-n
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publicfinalstaticint PAGESIZE = 30; *l'5z)]
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privateint pageSize = PAGESIZE; 1Gk'f?dw
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privateList items; Fpntd IU
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privateint totalCount; ['@R]Si"!
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privateint[] indexes = newint[0]; Qs\!Kk@
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privateint startIndex = 0; gOn^}%4.I
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public PaginationSupport(List items, int 8MCSU'uQ
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totalCount){ CGCSfoS9f
setPageSize(PAGESIZE); I)f54AX
setTotalCount(totalCount); gK-$y9]~+
setItems(items); .KE2sodq
setStartIndex(0); :JG2xtn
} YDiru
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public PaginationSupport(List items, int o%?~9rf]]
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totalCount, int startIndex){ RQd5Q.
setPageSize(PAGESIZE); OeY+Yt0
setTotalCount(totalCount); m-}6DN
setItems(items); nV?e(}D
setStartIndex(startIndex); j*@EJ"Gm>
} /Wm3qlv
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public PaginationSupport(List items, int (khMjFOg
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totalCount, int pageSize, int startIndex){ 5\P3JoH:Yg
setPageSize(pageSize); c!>",rce
setTotalCount(totalCount); T\$r|
setItems(items); oA$]%
setStartIndex(startIndex); I=wA)Bli1p
} DX@*lM
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publicList getItems(){ N+0`Jm
return items; <!.Qn
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} 5SmgE2 }
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publicvoid setItems(List items){ >,QW74o
this.items = items; _;`g*Kx
} ]iVoF N}^
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publicint getPageSize(){ #
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return pageSize; *heX[D
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} wUbLw
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publicvoid setPageSize(int pageSize){ d(j|8/tpA
this.pageSize = pageSize; ys$X!Ep
} <bxp/#6D
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publicint getTotalCount(){ A]"IQ-
return totalCount; iWu^m+"k
} t(?tPt4zp
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publicvoid setTotalCount(int totalCount){ Zp*0%x!e
if(totalCount > 0){ G9i?yd4n=B
this.totalCount = totalCount; c<j+"
int count = totalCount / \3v}:E+3
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pageSize; ?.b.mkJ
if(totalCount % pageSize > 0) 7e
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count++; ImVHX~qHJ
indexes = newint[count]; )rFcfS+/
for(int i = 0; i < count; i++){ ;NeN2 |I]
indexes = pageSize * 74q|FQ
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i; Ik74%x7G`
} YXWlg%s
}else{ Y>: e4Q
this.totalCount = 0; iH""dtO
} BSib/)p
} 0"to]=
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publicint[] getIndexes(){ #'jd.'>
return indexes; R-2V C
} >
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publicvoid setIndexes(int[] indexes){ SvD^'(
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this.indexes = indexes; t)/:VImY
} ^-i<TJ
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publicint getStartIndex(){ juc;]CHt'
return startIndex; geB]~/-p
} Ue22,Pp6
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publicvoid setStartIndex(int startIndex){ 4?)-;Hx_X
if(totalCount <= 0) t&99ZdE
this.startIndex = 0; &;O)Dw
elseif(startIndex >= totalCount) IrZ!.5%tV
this.startIndex = indexes P<WCW3!JZ
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[indexes.length - 1]; 2gnmk
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elseif(startIndex < 0) ZhpbbS
this.startIndex = 0; Z#P:C":e
else{ -N]%)Hy
this.startIndex = indexes o1(?j}:c|
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[startIndex / pageSize]; ,:1_I`d>#X
} E)=X8y
} [nnX,;
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publicint getNextIndex(){ Y]R;>E5o|
int nextIndex = getStartIndex() +
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pageSize; {a `#O9
if(nextIndex >= totalCount)
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return getStartIndex(); 8QYM/yAM
else wpLC,
return nextIndex; )m7 Y o
} U1wsCH3+n
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publicint getPreviousIndex(){ Z-D4~?Tv
int previousIndex = getStartIndex() - _;1H2o2f
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pageSize; JM-rz#;1
if(previousIndex < 0) (?7=$z!h
return0; gZD,#D.hR
else dUg| {l
return previousIndex; GcL:plz
} xJ(4RaP
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}
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抽象业务类 =(x W7Pt~
java代码: z sZP\
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/** C/{tvY /o
* Created on 2005-7-12 k5%:L2FO
*/ -:|1>og
package com.javaeye.common.business; &b#O=LF
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import java.io.Serializable; 4x'N#m{p
import java.util.List; U%~L){<V[
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import org.hibernate.Criteria; eviv,
import org.hibernate.HibernateException; .jfkOt?2
import org.hibernate.Session; _
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import org.hibernate.criterion.DetachedCriteria; Jn>6y:s
import org.hibernate.criterion.Projections; Jt3]'Nr04@
import c88I"5@[bD
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org.springframework.orm.hibernate3.HibernateCallback; %;Dp~T`0
import 7Q(5Nlfcz
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org.springframework.orm.hibernate3.support.HibernateDaoS >,Zf3M
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upport; vl'2O7
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import com.javaeye.common.util.PaginationSupport; z&6TdwhV
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public abstract class AbstractManager extends l$_Yl&!q$
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HibernateDaoSupport { N!fTt,
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privateboolean cacheQueries = false; 5+gSpg]i
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privateString queryCacheRegion; <3;Sq~^
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publicvoid setCacheQueries(boolean nzdJ*C
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cacheQueries){ YuZxKuGy
this.cacheQueries = cacheQueries; @GB~rfB[
} XCGJ~
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publicvoid setQueryCacheRegion(String jo.Sg:7&
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queryCacheRegion){ Myj 68_wf
this.queryCacheRegion = 7>a-`"`O
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queryCacheRegion; AQ>8] `e`
} =c-,uW11[
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publicvoid save(finalObject entity){ d8|bO#a%9
getHibernateTemplate().save(entity); (qDu|S3P
} p#~Dq(Q
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publicvoid persist(finalObject entity){ Qg \OJmv
getHibernateTemplate().save(entity); JY+ N+c\
} tntQO!pM
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publicvoid update(finalObject entity){ oCBZ9PGkK
getHibernateTemplate().update(entity); }=':)?'-.
} ,<[Q/:}[
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publicvoid delete(finalObject entity){ [f'V pId8
getHibernateTemplate().delete(entity); :<
} ;'.[h*u~<
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publicObject load(finalClass entity, Xgge_`T9
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finalSerializable id){ 1]L 0r
return getHibernateTemplate().load C0xjM0
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(entity, id); t,*hxzD"
} jXBAo
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publicObject get(finalClass entity, \;z*j|;B
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finalSerializable id){ >AT{\W!N
return getHibernateTemplate().get Fxu'(xa
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(entity, id); #Z'r;YOzs
} VpDNp
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publicList findAll(finalClass entity){ ,;aELhMZ
return getHibernateTemplate().find("from *(%]|z}]m
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" + entity.getName()); cr{;gP
} +ht -Bl
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publicList findByNamedQuery(finalString XY[uyR4Z
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namedQuery){ ,4bqjkX5q
return getHibernateTemplate LV4]YC
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().findByNamedQuery(namedQuery); _;]
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} X~DI d
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publicList findByNamedQuery(finalString query, cxBu2(Y
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finalObject parameter){ tpJe1 J<
return getHibernateTemplate &-Bw7v
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().findByNamedQuery(query, parameter); 2|xNT9RW
} bk@F/KqL
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publicList findByNamedQuery(finalString query, GA,6G [E
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finalObject[] parameters){ prf
return getHibernateTemplate R<}n?f\#JZ
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().findByNamedQuery(query, parameters); K&zp2V
} uyt]\zVT
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publicList find(finalString query){ ?0>%
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return getHibernateTemplate().find S]kY'(V(*
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(query); [FHSFr
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} Q+
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publicList find(finalString query, finalObject t(-`==.R
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parameter){ :wn9bCom?M
return getHibernateTemplate().find A
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(query, parameter); Nwu, :}T
} }g1V6`8&
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public PaginationSupport findPageByCriteria 6Z:<?_p%7g
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(final DetachedCriteria detachedCriteria){ mM| 313
return findPageByCriteria R;2tb7 o
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); <!ewb=[_$
} 0{0|M8
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public PaginationSupport findPageByCriteria YK[PC]w
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(final DetachedCriteria detachedCriteria, finalint PNwXZ/N%
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startIndex){ N/ 7Q(^
return findPageByCriteria ]?n)!u
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(detachedCriteria, PaginationSupport.PAGESIZE, N"X;aVFs_
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startIndex); }bQqln)#
} ku=o$I8K
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public PaginationSupport findPageByCriteria ~)';[Ha
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(final DetachedCriteria detachedCriteria, finalint W`}C0[%VW
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pageSize, mJBvhK9%
finalint startIndex){ s68&AB
return(PaginationSupport) %E\&9,
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate Jx#r
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(Session session)throws HibernateException { {ZiZ$itf
Criteria criteria = 9C?;'
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detachedCriteria.getExecutableCriteria(session); II!Nr{A
int totalCount = >j [> 0D
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((Integer) criteria.setProjection(Projections.rowCount k 7 !{p
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()).uniqueResult()).intValue(); f9A^0A?c
criteria.setProjection qd@x#"qT
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(null); 0/".2(\}T
List items = bVEt?E*+
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criteria.setFirstResult(startIndex).setMaxResults K)m\xzT/
?W l=F/
(pageSize).list(); >"^H"K/T
PaginationSupport ps = K8,fw-S%
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new PaginationSupport(items, totalCount, pageSize, qA4w*{JN
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startIndex); kHj|:,'sV
return ps; =yn|.%b
} <I}O_:%
}, true); +9S_H(
} ! }u'%
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public List findAllByCriteria(final <S*o}:iB
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DetachedCriteria detachedCriteria){ seT?:PCA
return(List) getHibernateTemplate qla$}dnvc
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().execute(new HibernateCallback(){ zLQplw`#
publicObject doInHibernate F<'@T,LVc
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(Session session)throws HibernateException { j5lSu~
Criteria criteria = nl9G1Sm(E
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detachedCriteria.getExecutableCriteria(session); N%1T>cp0
return criteria.list(); =d#3& R]p
} %xE9vN;
}, true); P{
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} 2jQ|4$9j
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public int getCountByCriteria(final [[{y?-U
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DetachedCriteria detachedCriteria){ wO6`Ap
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Integer count = (Integer) Etk`>,]Y>y
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getHibernateTemplate().execute(new HibernateCallback(){ :OC`X~}Rc
publicObject doInHibernate l`s_Id#
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(Session session)throws HibernateException { vM5u]u!
Criteria criteria = }gY:VDW
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detachedCriteria.getExecutableCriteria(session); 9p
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return S^}@X?v
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criteria.setProjection(Projections.rowCount -3 }
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()).uniqueResult(); p9*#{~
} jPG&Ypm1
}, true); Q_<CG[,6D1
return count.intValue(); X(m&
} !^ko"^p
} ZU%7m_ zO
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用户在web层构造查询条件detachedCriteria,和可选的 '2+Rb7V
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 {}ks[%,_\
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PaginationSupport的实例ps。 m7z6c"?lB
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ps.getItems()得到已分页好的结果集 >mzK96
ps.getIndexes()得到分页索引的数组 a%2r]:?^?
ps.getTotalCount()得到总结果数 K-VNU
ps.getStartIndex()当前分页索引 MH{$"^K
ps.getNextIndex()下一页索引 Z/=x(I0
ps.getPreviousIndex()上一页索引 Pyc/6~?
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Ql-RbM
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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 OyVdQ".
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一下代码重构了。 =
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我把原本我的做法也提供出来供大家讨论吧: D.G+*h@ g
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首先,为了实现分页查询,我封装了一个Page类: /M>8ad
java代码: M~Tq'>Fn
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/*Created on 2005-4-14*/ Yrp
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package org.flyware.util.page; qv<[f=X9|
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/** BwO^F^Pr?k
* @author Joa f`@$saFD
* ^`
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*/ {4"!~W
publicclass Page { nU$;W
j*"V!d
/** imply if the page has previous page */ (hTe53d<S?
privateboolean hasPrePage; fk%r?K 6K
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/** imply if the page has next page */ ;j]0GD,c$
privateboolean hasNextPage; 9I*zgM!F
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/** the number of every page */ pv%UsbY
privateint everyPage; A$G>D3
&CW,qY,sh
/** the total page number */ ) &[S*g
privateint totalPage; F3/aq+<P[
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/** the number of current page */ -Y'Qa/:7
privateint currentPage; mXnl-_
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/** the begin index of the records by the current N(0G!sTI
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{@^
query */ g1-^@&q
privateint beginIndex; D_r&B@4w
[ h7nOUL!
|- 39ZZOX
/** The default constructor */ qX[a\HQa
public Page(){ 4[t1"s~Wg
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} H)S&sx#q]
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/** construct the page by everyPage ia!t~~f
* @param everyPage ]c,ttS_
* */ F)KUup)gc
public Page(int everyPage){ 9u";%5 4
this.everyPage = everyPage; dM"Suw
} g+h)s!$sB
#|76dU
/** The whole constructor */ xwG=&+66
public Page(boolean hasPrePage, boolean hasNextPage, uxF88$=!t
/I|.^ Id|
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int everyPage, int totalPage, 4PUSFZK?
int currentPage, int beginIndex){ fMRBGcg7Dc
this.hasPrePage = hasPrePage; dD@k{5
this.hasNextPage = hasNextPage; *Q=ER
this.everyPage = everyPage; ! 9B| `
this.totalPage = totalPage; D. !m*oq
this.currentPage = currentPage; Vrl)[st!;I
this.beginIndex = beginIndex; *Iv.W7 [
} p$^}g:
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/** ^Nl)ocHv!
* @return UD6D![e
* Returns the beginIndex. 7r,'a{Rcn
*/ vKYdYa\
publicint getBeginIndex(){ [|PVq#(
return beginIndex; WvVHSa4{
} .RocENO0
N8.K[ m
/** dOPA0Ja
* @param beginIndex WoGK05w
* The beginIndex to set. p#HbN#^Hy
*/ "/6<k0.D&
publicvoid setBeginIndex(int beginIndex){ dj,7lJy
this.beginIndex = beginIndex; 5^lroC-(x
} j&n][=PL
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/** #@xSR:m
* @return `k ~.>#
* Returns the currentPage. Oo{+W5[
*/ 7Yp;B:5@
publicint getCurrentPage(){ ro{q':Z3
return currentPage; ]nE_(*w
} m~Q]#r
= Ly7H7Q2
/** .),%S}
* @param currentPage EIO!f[]o
* The currentPage to set. J~7E8
*/ v%c r
publicvoid setCurrentPage(int currentPage){ O8#}2
this.currentPage = currentPage; WK5~"aw
} 6kH47Yc?
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/** UBoN}iR
* @return $r%m<Uc;}O
* Returns the everyPage. HPVW2Y0_N
*/ o3*IfD
publicint getEveryPage(){ .sNUU 3xSC
return everyPage; hYRGIpu5
} .])ubK_9
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/** OMG.64DX .
* @param everyPage j3 d=O!
* The everyPage to set. (5[|h
*/ fF!Mmm"
publicvoid setEveryPage(int everyPage){ [OFg
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this.everyPage = everyPage; DE3>F^ j
} [oN}zZP]
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/** LQ4GQqS*
* @return jSbO1 go#
* Returns the hasNextPage. pVe@HJy6G
*/ )yp+!\
publicboolean getHasNextPage(){ ]|g{{PWH
return hasNextPage; S^|Uzc
} Y~]E6'Bz
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/** cQDn_Sjhi
* @param hasNextPage rq'Cj<=Zj
* The hasNextPage to set. "<b~pfCOQk
*/ xi=Z<G
publicvoid setHasNextPage(boolean hasNextPage){ <-uE pF
this.hasNextPage = hasNextPage; v|acKux=t
} C$`z23E
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/** rqk1 F~j|
* @return ^yDCX
* Returns the hasPrePage.
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*/ lO},fM2j
publicboolean getHasPrePage(){ Omo1p(y
return hasPrePage; i-!Z/,oL
} sxM0c
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/** q:Gi
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* @param hasPrePage ^44AE5TO
* The hasPrePage to set. =KJK'1m9
*/ w^N xR,
publicvoid setHasPrePage(boolean hasPrePage){ l
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this.hasPrePage = hasPrePage; TTcMIMyLT
} zt{?Ntb
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/** K~**. NF-n
* @return Returns the totalPage. D*3\4=6x
* *44^M{ti<
*/ j48cI3C
publicint getTotalPage(){ hEAt4z0P
return totalPage; [su2kOX|X
} kSGFLP1FN
}{;m:Iia_
/** J =o,: 3"
* @param totalPage K FV&Dt}<
* The totalPage to set. [ 9)9>-
*/ INrl^P*
publicvoid setTotalPage(int totalPage){ /NFv?~</k
this.totalPage = totalPage; W 0^.Dx
} A `\2]t$z
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} tcOgF:
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 B$A`-
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个PageUtil,负责对Page对象进行构造: `` (D01<
java代码: 0/?V _
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/*Created on 2005-4-14*/ pk2OZ,14Mj
package org.flyware.util.page; E/x``,k
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import org.apache.commons.logging.Log; _?Zg$7VJ
import org.apache.commons.logging.LogFactory; HJ[@;F|aU
Y6L_
_ RT
/** BeZr5I"`}
* @author Joa mk?&`_X1
* B[jCe5!w
*/ oiYI$ql3L
publicclass PageUtil { fR<_ 4L
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privatestaticfinal Log logger = LogFactory.getLog zs!,PQF(
yHL 2!
(PageUtil.class); &Ji!*~sE
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/** !mhV$2&r
* Use the origin page to create a new page ,Cx @]]
* @param page Wk w.z
* @param totalRecords \C;cs&\Q
* @return JK:i-
*/ Lqy]bnY
publicstatic Page createPage(Page page, int ?EF[OyE
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totalRecords){ t.|b285e
return createPage(page.getEveryPage(), M.|O+K z
71`)@y,Z,
page.getCurrentPage(), totalRecords); mX))*e4k
} 7i?"akr4
ximW!y7
/** b4%sOn,
* the basic page utils not including exception 4PG]L`J{
\fG?j@Qx
handler Htd-E^/
* @param everyPage KhK:%1po
* @param currentPage Gkci_A*
* @param totalRecords sd|5oz)
* @return page |uT|(:i84,
*/ O>UG[ZgW
publicstatic Page createPage(int everyPage, int &u)
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currentPage, int totalRecords){ `j+aAxJ=\
everyPage = getEveryPage(everyPage); Wt=QCutt
currentPage = getCurrentPage(currentPage); `8^4,
int beginIndex = getBeginIndex(everyPage, \FOoIY!.x
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currentPage); fWo}gH~
int totalPage = getTotalPage(everyPage, 297X).
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totalRecords); j} ^?3<
boolean hasNextPage = hasNextPage(currentPage, 1FC'DH!
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totalPage); 07pASZ;~
boolean hasPrePage = hasPrePage(currentPage); feg
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returnnew Page(hasPrePage, hasNextPage, It$'6HV~Sb
everyPage, totalPage, #
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currentPage, C+\c(M a
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beginIndex); =.197)e
} H+Dv-*i
3ZRi@=kWz
privatestaticint getEveryPage(int everyPage){ /'KCW_Q
return everyPage == 0 ? 10 : everyPage; nT.i|(xd.
} ^Pqj*k+F
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privatestaticint getCurrentPage(int currentPage){ jI})\5<R
return currentPage == 0 ? 1 : currentPage; :E
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} hKa<9>MI`
kY d'6+m
privatestaticint getBeginIndex(int everyPage, int :iW+CD)j
~*aPeJ
currentPage){ XL9smFq
return(currentPage - 1) * everyPage; @Z9X^Y+u^h
} qPle=6U[IL
MR$R#
privatestaticint getTotalPage(int everyPage, int D c5tRO
>TZ 'V,
totalRecords){ iveJh2!#<
int totalPage = 0; (C{l4
@~t^zI1
if(totalRecords % everyPage == 0) 1Pya\To,m
totalPage = totalRecords / everyPage; _:(RkS!x
else kn2s,%\`<p
totalPage = totalRecords / everyPage + 1 ; [6+iR
+XL^dzN[|$
return totalPage; 4^4<Le-G
} Udj!y$?
fC6zDTis8A
privatestaticboolean hasPrePage(int currentPage){
=j,2
return currentPage == 1 ? false : true; 7X+SK&PX
} i_/A,5TF
25e*W>SLw
privatestaticboolean hasNextPage(int currentPage, OH.lAF4E(
'OrGt_U
int totalPage){ 1Q[I $=-F
return currentPage == totalPage || totalPage == "cJ))v-'
;U+4!N
0 ? false : true; 4oxAC; L
} 9i9'Rd`g
2HA-q),6
{owXyQ2mK
} rlUo#
5"~F#vt
8PKUg
"p
80(Olf@PE
.|XG0 M
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 b'x26wT?
HL8onNq
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 QMO.Bnek
&m{SWV+
做法如下: tVI6GXH
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 244[a]
%&;
4gR;,%E\TO
的信息,和一个结果集List: \mK;BWg)
java代码: aM U0BS"
Gm`#0)VC
zWs("L(#s
/*Created on 2005-6-13*/ G_ -8*.
package com.adt.bo; 7+(on
`kE ;V!n?
import java.util.List; RA];hQI?
o]R*6$
import org.flyware.util.page.Page; '{>R-}o[3
7~zd
%
o
/** |B{@noGX
* @author Joa fBj-R~;0
*/ %P8*Az&]T
publicclass Result { j\hI, mc
d76nyQKK
private Page page; a:v5(@8
LE@<)}Au^
private List content; QUQw/
Am'%tw
~
/** M6nQ17\{
* The default constructor `[)!4Jb
*/ }Quk n
public Result(){ &':Ecmo~`
super(); $@Bd}35 J
} -v@LJCK7I
]z77hcjB1
/** ,1K`w:uhS
* The constructor using fields _O,k0O
* Q[n*ce7L0
* @param page }Fq~!D
Ee
* @param content f(Su
*/ e 48N[p
public Result(Page page, List content){ te[#FF3{
this.page = page; m;4qs#qCg?
this.content = content; n^lr7(!6
} luWr.<1
,=IGqw
/** 7g7[a/Bts
* @return Returns the content. GQH15_
*/ .&i_~?1[N
publicList getContent(){ @sdHB./
return content; S+ 3lX7
} u7/]Go44
:pH3M[7
/** ]t"X~
* @return Returns the page. v ^R:XdH
*/ "@^^niSFl
public Page getPage(){ Ga]\~31NE
return page; f2LiCe.?
} koojF|H>
+RBX2$kB
/** le|Rhs%Z%
* @param content goqm6L^Cu
* The content to set. C~-.zQ$
*/ ?/}N
public void setContent(List content){ I7
= 4%)A
this.content = content; YD{Ppz
} /lS5B6NU
}' p"q)
/** %dwI;%0
* @param page hLICu[LC?
* The page to set. 0FcG;i+
*/ cj\?vX\V
publicvoid setPage(Page page){ Ul<:Yt&nI
this.page = page; Y|!m
} "wR1=&gk
} 8l l}"
dQs>=(|t
a=4 `C*)
nw-%!}Ot"
tMiy`CPh
2. 编写业务逻辑接口,并实现它(UserManager, 3GL,=q
G]n_RP$G
UserManagerImpl) Bra}HjHO
java代码: -#Ys67,4N
JJHO E{%
9Ca }+
/*Created on 2005-7-15*/ b_ vKP
package com.adt.service; u[E0jI
X`20=x
import net.sf.hibernate.HibernateException; >{)\GK0i7
-V&nlP
import org.flyware.util.page.Page; z2lT4SAv+
Ea)=K'Pz
import com.adt.bo.Result; 7J;\&q'
/|p\l"
/** 5gSe=|we*p
* @author Joa YU`}T<;bg
*/ !l-Q.=yw
publicinterface UserManager { YB1Jv[
4:=VHd
public Result listUser(Page page)throws hTQ8y10a
tIT/HG_o
HibernateException; d=0{vsrB
8'ut[
} jf.WmiDC
$|tk?Sps
rI OKCL?
2f0mr?l)N
=pBr_pGz=
java代码: 9tWpxrig%
(l -l
Y
ZPG~@lU
/*Created on 2005-7-15*/ kni{1Gr
package com.adt.service.impl; Iqci}G%r
:*ZijN*{)$
import java.util.List; VHi'~B#'*
*P/DDRq(2
import net.sf.hibernate.HibernateException; Ss3~X90!*B
3Rhoul[S
import org.flyware.util.page.Page; +NJIi@
import org.flyware.util.page.PageUtil; >0UY,2d
9PUobV_^Wo
import com.adt.bo.Result; mT/^F{c
import com.adt.dao.UserDAO; )3WUyD*UZN
import com.adt.exception.ObjectNotFoundException; }9 ]7V <
import com.adt.service.UserManager; :PK2!
0nK
"A*;V
/** ~3Za"q*0s
* @author Joa Mh2Zj
*/ TBIr^n>Z<k
publicclass UserManagerImpl implements UserManager { `-.6;T}2U
D_?dy4\
private UserDAO userDAO; 82 dmlPwJC
:NL[NbQYt
/** #uV J
* @param userDAO The userDAO to set. ;9Qxq]
*/ |~@yXc5a
publicvoid setUserDAO(UserDAO userDAO){ P!SsMo6n
this.userDAO = userDAO; V,%K"b=
} IE3GZk+a~
Y4+]5;B8
/* (non-Javadoc) W!"Oho'
* @see com.adt.service.UserManager#listUser 1gnLKf c
}mo)OyIX
(org.flyware.util.page.Page) dlA0&;}z
*/ Xf{9rZ+
public Result listUser(Page page)throws OnH3Ss$
)gD2wk(
HibernateException, ObjectNotFoundException { },{sJ0To
int totalRecords = userDAO.getUserCount(); 1\%@oD_zG
if(totalRecords == 0) iL!4r]~H
throw new ObjectNotFoundException vQG v4
LM(r3sonb
("userNotExist"); (+6N)9rj`/
page = PageUtil.createPage(page, totalRecords); #Cx#U"~G`
List users = userDAO.getUserByPage(page); Z^BZH/I?
returnnew Result(page, users); PC\p>6xT
} ?-~<Vc*
}(!rB#bf
} 3kT?Y7<fv
>X*G6p
/x)i}M)
@r^s70{}
iUFG!,+d
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 x:Q$1&3N
3ZbqZ"rE
询,接下来编写UserDAO的代码: #]Lodo9rS\
3. UserDAO 和 UserDAOImpl: |&@`~OBa
java代码: r/@ Wn
i8KoJY"
/;TtMQt
/*Created on 2005-7-15*/ "[rz*[o8I
package com.adt.dao; &grvlK
E,dUO;
import java.util.List; #?`S+YN!q)
_#Lq~02 %
import org.flyware.util.page.Page; ]t~'wL#Z
Mnk-"d
import net.sf.hibernate.HibernateException; #|3,DZ|)F
f~,Ml*Zp
/** l8J2Xd @
* @author Joa ei>iXDt
*/ zC*dJXt@
publicinterface UserDAO extends BaseDAO { tqCwbi
h4=mGJpm
publicList getUserByName(String name)throws 4cqf=
S&.xgBR
HibernateException; mfF `K2R
XH(-anU"!P
publicint getUserCount()throws HibernateException; Y
DW^N]G
%iME[| u&
publicList getUserByPage(Page page)throws :yE0DS<_
&*E! %57
HibernateException; L7n G5i
(>Nwd^
} E!.&y4
db=S*LUbl
, Y,^vzX6
IlwHHt;njp
<o[3*59
java代码: W'=}2Y$]u
azNv(|eeJL
*wsZ aQ
/*Created on 2005-7-15*/ 4<vi@,s
package com.adt.dao.impl; I(WIT=Wi<
Y@<jvH1
import java.util.List; =}@1Z~
%!AzFL
J|Z
import org.flyware.util.page.Page; Vugb;5Vl
Vr d16s
import net.sf.hibernate.HibernateException; G;J)[y
import net.sf.hibernate.Query; rC]k'p2x
s"J)Jc
import com.adt.dao.UserDAO; ,t;US.s([.
DajN1}]
/** -/0aGqY
* @author Joa n(|n=P:o
*/ ZR-64G=L,
public class UserDAOImpl extends BaseDAOHibernateImpl UCkV;//.
CW/<?X<!n
implements UserDAO { LEe{fc?{
3TZ:
/* (non-Javadoc) !! )W`
* @see com.adt.dao.UserDAO#getUserByName mhOgv\?
Ud2Tn*QmI
(java.lang.String) :bi(mX7t
*/ AlG5n'
publicList getUserByName(String name)throws i~AReJxt7
Gg]Jp:GF
HibernateException { %rgW}Z5
String querySentence = "FROM user in class =F Y2O`%a
pq\N2d
com.adt.po.User WHERE user.name=:name"; ASrRMH[
Query query = getSession().createQuery qJf\,7mi
h{H*k#>
(querySentence); -'L~Y~'.
query.setParameter("name", name); ,Vo[mB
return query.list(); H3`.Y$z
} ~'0ZW<X.
)n1[#x^I
/* (non-Javadoc) F |R7hqf
* @see com.adt.dao.UserDAO#getUserCount() <2]D3,.g.
*/ RHpjJZUV
publicint getUserCount()throws HibernateException { R*FDg;t4
int count = 0; C"mWO Y2]
String querySentence = "SELECT count(*) FROM lN8l71N^
1
?Zw
user in class com.adt.po.User"; kM1N4N7
Query query = getSession().createQuery Cz$q"U
Lfdg5D5.P
(querySentence); ij~-
count = ((Integer)query.iterate().next S0gxVd(
h^qZi@L
()).intValue(); F
u^j- Io
return count; b62B|0i
} Ctn?O~u
&l!T2PX!
/* (non-Javadoc) olA+B
* @see com.adt.dao.UserDAO#getUserByPage C^;8M'8z0
L;y BZLM
(org.flyware.util.page.Page) ,!GoFu
*/ HRjbGc|[
publicList getUserByPage(Page page)throws 3&5b!Y
I{WP:]"Yf
HibernateException { bd-iog(
String querySentence = "FROM user in class O"df5x9@
rnQ_0d
com.adt.po.User"; X9SOcg3a
Query query = getSession().createQuery DpQWh+WRy
xGbq,~_r
(querySentence); ^,t@HN;gA
query.setFirstResult(page.getBeginIndex()) GUqG1u z9
.setMaxResults(page.getEveryPage()); Rg\4#9S JF
return query.list(); ~e]B[>PT
} tPN CdA
]4V1]
} O6 s3#iu
b SgbvnJ
]W4{|%@H"
_x3=i\O,
^);M}~
至此,一个完整的分页程序完成。前台的只需要调用 %n8CK->
6OAEAIh
userManager.listUser(page)即可得到一个Page对象和结果集对象 B:0oT
QT73=>^B
的综合体,而传入的参数page对象则可以由前台传入,如果用 IbL'Z
<?}pCX/O
webwork,甚至可以直接在配置文件中指定。 +:=FcsY
a~a:mM>p
下面给出一个webwork调用示例: L-S5@;"
java代码: {X{S[(|
m&DI2he
5/i/.
0?n
/*Created on 2005-6-17*/ 0bc>yZ\R
package com.adt.action.user; "+Ys}t~2
_u u&? <h
import java.util.List; 3N+B|WrM
j[FB*L1!D
import org.apache.commons.logging.Log; b]Kb ~y|
import org.apache.commons.logging.LogFactory; 9L3P'!Z
import org.flyware.util.page.Page; WLwi
eyp_.1C~
import com.adt.bo.Result; IDD`N{EA
import com.adt.service.UserService; TQNdBq5I6
import com.opensymphony.xwork.Action;
89GW!
S;gy:n!t
/** <nG}]Smd7
* @author Joa DR3om;Uk
*/ "v`q%(TA
publicclass ListUser implementsAction{ mAGD qz>f
lo'#dpt<
privatestaticfinal Log logger = LogFactory.getLog Mp!1xx
aXQAm$/
>
(ListUser.class); '0)`.
3)LS#=
private UserService userService; a9.255
XOQ0(e6
private Page page; z;2& d<h
?V+\E2
privateList users; ;S$
L;?F^RK{U
/* cJ@fJ|
* (non-Javadoc) T,uF^%$@AQ
* kdlmj[=
* @see com.opensymphony.xwork.Action#execute() &qSf
~7/
*/ 6SE^+@jR
publicString execute()throwsException{ &08dW9H
Result result = userService.listUser(page); Lb<IEy77\
page = result.getPage(); x|Pz24yP9
users = result.getContent(); IemhHf ^l
return SUCCESS; 4q7H
} 4|I;z
Ja4M@z
/** &v1E)/q{Z
* @return Returns the page. }` H{;A
h
*/ "eOl(TSu/
public Page getPage(){ ^E\n^D-RV
return page; }vOg9/[{
} N%Y!{k5T7
ohyq/u+y~A
/** YcwDNsk
* @return Returns the users. lX2:8$?X
*/ a?GXVQ
publicList getUsers(){ w6h83m
3
return users; btnD+O66<
} \),f?f-m
u$zRm(!RB
/** tN4&#YK<
* @param page Sw; kUJ
* The page to set. ^'tT_
gT
*/ >@cBDS<6R
publicvoid setPage(Page page){ 8%YyxoCH
this.page = page; M=ag\1S&ZF
}
"$J5cco
Yy]TU} PY
/** yi~]}M
* @param users A&B|n!;b
* The users to set. 3X;>cv#B
*/ _%Xp2`m
publicvoid setUsers(List users){ -zJV(`
this.users = users; {{_v.d~1
} cfv:Ld m
~8(Xn2
/** ;8K>]T)
* @param userService 'q~<ZO
* The userService to set. X)Tyxppf'
*/ +e*C`uP!
publicvoid setUserService(UserService userService){ J?dz>3Rhx9
this.userService = userService; [.xc`CF
} _w%:PnO
} \<xo`2b
V9Mr&8{S4
.{?;#Cdn
F;_o `h
FJ!`[.t1AU
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, [:(O`#
>7cj.%
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 NKB["+S<
o$% KbfXO]
么只需要: B:UPSX)A
java代码: eY?OUS
5Rw2/J
L
G,P
k3>I'
<?xml version="1.0"?> #?D[WTV
<!DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork qBK68B)
2G5|J{4w
1.0//EN" "http://www.opensymphony.com/xwork/xwork- =N\$$3m?
HN/YuP03[
1.0.dtd"> NYg&