Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 gK[;"R)4o@
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 'YNdrvz
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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 DdgiY9a.
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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 ;X,u
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分页支持类: yS\&2"o
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java代码: D%YgS$p[M$
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package com.javaeye.common.util; %x$U(I}
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import java.util.List; Bvn3:+(47
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publicclass PaginationSupport { c0@8KW[,
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publicfinalstaticint PAGESIZE = 30; &[.`xZ(|
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privateint pageSize = PAGESIZE; -1g:3'%
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privateList items; 5~JT*Ny
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privateint totalCount; Zh<;r;2
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privateint[] indexes = newint[0]; #.bW9j/
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privateint startIndex = 0; %fqR
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public PaginationSupport(List items, int $<^t][{
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totalCount){ SiratkP9n7
setPageSize(PAGESIZE); =Ph8&l7~sp
setTotalCount(totalCount); S(Yd.Sp
setItems(items); <>cS@V5j
setStartIndex(0); (\9`$
} T #\
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public PaginationSupport(List items, int ^OR0Vp>L
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totalCount, int startIndex){ #o.e
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setPageSize(PAGESIZE); Sqo+cZ
setTotalCount(totalCount); )O]T}eI
setItems(items); {meX2Z4
setStartIndex(startIndex); Mqf Ns<2
} '|C3t!H`
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public PaginationSupport(List items, int wbO6Ag@))
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totalCount, int pageSize, int startIndex){ N%y i4
setPageSize(pageSize); woYD &Oml
setTotalCount(totalCount); &1xCPKIr
setItems(items); *2'8d8>R%]
setStartIndex(startIndex); 'Ts:.
} DX>a0-Xj
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publicList getItems(){ m7 =$*1k
return items;
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} d"$8-_K
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publicvoid setItems(List items){ FqKJids-
this.items = items; THA9OXP
} INZVe(z
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publicint getPageSize(){ #Ondhy%h[
return pageSize; R`?l.0
} B~Q-V&@o
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publicvoid setPageSize(int pageSize){ fn#8=TIDf
this.pageSize = pageSize; ,w
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} # kI>
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publicint getTotalCount(){ A]1Nm3@
return totalCount; _`$LdqgE
} `sxfj)s
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publicvoid setTotalCount(int totalCount){ H^_,e= j
if(totalCount > 0){ :NzJvI<
this.totalCount = totalCount; OI R5QH
int count = totalCount / CU$khz"
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pageSize; xVvUx,t
if(totalCount % pageSize > 0) \?:L>-&h8
count++; b^Hrzn
indexes = newint[count]; ~Eut_d
for(int i = 0; i < count; i++){ B(
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indexes = pageSize * eh#37*-
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} vNv?trw
}else{ T}~TW26v
this.totalCount = 0; BT{;^Hp
} ^s,3*cAU
} yr]ja-Y
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publicint[] getIndexes(){ y)f.ON36I
return indexes; !`ol&QQ#
} 1I Yip\:lS
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publicvoid setIndexes(int[] indexes){ ^<]'?4m]
this.indexes = indexes; 4Nm >5*]
} T.q2tC[bR
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publicint getStartIndex(){ B|(g?
return startIndex; 6|97;@94
} sW^M
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publicvoid setStartIndex(int startIndex){ *[MWvs:,
if(totalCount <= 0) VJ*1g+c
this.startIndex = 0; PSrx!
elseif(startIndex >= totalCount) n
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this.startIndex = indexes LS@TTiN
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[indexes.length - 1]; ~G@NWF?7
elseif(startIndex < 0) [X(m[u '%
this.startIndex = 0; `At.$3B
else{ lR(9;3
this.startIndex = indexes rOIb9:
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[startIndex / pageSize]; pDQ
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} dQX-s=XJ
} 6#w>6g4V~R
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publicint getNextIndex(){ !_glZ*tL
int nextIndex = getStartIndex() + cJKnB!iL5
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pageSize; 7j&
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if(nextIndex >= totalCount) 2w>%-_]u+
return getStartIndex(); 1nVQYqT_
else vrn4yHoZ
return nextIndex; 7KtU\u
} opX07~1
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publicint getPreviousIndex(){ Zy0M\-Mn
int previousIndex = getStartIndex() - HOW<IZ^
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pageSize; 5-dt0I@<
if(previousIndex < 0) (}#&HE<
return0; "$BkO[IS
else Y;af|?U*6:
return previousIndex; 3=S|U,
} N'1I6e"
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} (>`_N%_
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抽象业务类 b+s'B4@rb
java代码: U$:^^Zt`B
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/** Owp]>e
* Created on 2005-7-12 ,Csdon
*/ 1$Up7=Dr=
package com.javaeye.common.business; {/[@uMS_6]
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import java.io.Serializable; CKw-HgXG
import java.util.List; cT(nKHL
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import org.hibernate.Criteria; %6ckau1_;
import org.hibernate.HibernateException; a$W
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import org.hibernate.Session; t!D'ZLw
import org.hibernate.criterion.DetachedCriteria; osc8;B/
import org.hibernate.criterion.Projections; ;5X6`GlS#5
import 1I;q@g0
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org.springframework.orm.hibernate3.HibernateCallback; .]9`eGVWj
import fWP]{z`
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org.springframework.orm.hibernate3.support.HibernateDaoS yf{\^^ i(
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upport; \:'GAByy
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import com.javaeye.common.util.PaginationSupport; \Y,P
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public abstract class AbstractManager extends R0M>'V?e
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HibernateDaoSupport { pIIp61=$
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privateboolean cacheQueries = false; WjBml'^RY
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privateString queryCacheRegion; ]n=z(2Z9lD
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publicvoid setCacheQueries(boolean .p{lzI9
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cacheQueries){ UAjN
this.cacheQueries = cacheQueries; 7$7|~k
} s?<FS@k
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publicvoid setQueryCacheRegion(String s=$xnc}mf
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queryCacheRegion){ yXkQ
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this.queryCacheRegion = }[%F
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queryCacheRegion; Gb2|e.z
} 6l|L/Z_6
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publicvoid save(finalObject entity){ -0uGzd+m*
getHibernateTemplate().save(entity); (muJ-~CJk
} i<&z'A6&]*
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publicvoid persist(finalObject entity){ T7YJC,^m
getHibernateTemplate().save(entity); tL&_@PD)3
} ko.%@Y(=
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publicvoid update(finalObject entity){ C&F%
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getHibernateTemplate().update(entity); };2Lrz9<
} 2C0j.Ib
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publicvoid delete(finalObject entity){ H/f}tw
getHibernateTemplate().delete(entity); y;0Zk~R$
} ldG8hK
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publicObject load(finalClass entity, d*!H&1L
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finalSerializable id){ wV-N\5!r%H
return getHibernateTemplate().load $sL+k 'dY
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(entity, id); c5CxR#O
} v&sp;%I6=
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publicObject get(finalClass entity, Q0PqyobD
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finalSerializable id){ u`L*
return getHibernateTemplate().get VQ~eg wJL
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(entity, id); 7Aw <:
} 1^Q!EV
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publicList findAll(finalClass entity){ yYC\a7Al4
return getHibernateTemplate().find("from TDtHRhq7
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" + entity.getName()); xoSBMf
} Mi!ak
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publicList findByNamedQuery(finalString =F*{O=
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namedQuery){ lKirc2
return getHibernateTemplate ~ "~uXNd
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().findByNamedQuery(namedQuery); 51%<N\>/4
} k/xNqN(
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publicList findByNamedQuery(finalString query, )o_$AbPt
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finalObject parameter){ 3'Z+PPd!
return getHibernateTemplate I8hmn@ce
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().findByNamedQuery(query, parameter); V> eJ
} k.0pPl
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publicList findByNamedQuery(finalString query, y/?;s]>b
)3_g&&
finalObject[] parameters){ Z Q9's
return getHibernateTemplate q->46{s|
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().findByNamedQuery(query, parameters); }Sb&ux
} v3jx2Z
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publicList find(finalString query){ hta$k%2
return getHibernateTemplate().find Y6@A@VJ
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(query); T1b9Zqc)f
} ph1veD<ZZ
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publicList find(finalString query, finalObject hMs}r,*
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parameter){ ]pA}h.R#-
return getHibernateTemplate().find >&9Iy"
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(query, parameter); 2?7a\s
} PFIL)D
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public PaginationSupport findPageByCriteria Hv>Hz*s_I
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(final DetachedCriteria detachedCriteria){ #/1,Cv yj
return findPageByCriteria {4{ACp
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); {/ _.]Vh
} {ByT,92
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public PaginationSupport findPageByCriteria /T*]RO4%>]
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(final DetachedCriteria detachedCriteria, finalint )P.|Xk:r
}g _#.>D+
startIndex){ !NYc!gYD
return findPageByCriteria ZA ii"F
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(detachedCriteria, PaginationSupport.PAGESIZE, @*l}2W
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startIndex); _W*3FH
} #tBbvs+%
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public PaginationSupport findPageByCriteria .x1EdfHed/
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(final DetachedCriteria detachedCriteria, finalint ~GS`@IU}
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pageSize, d8
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finalint startIndex){ Oy[t}*Ik
return(PaginationSupport) O`mW,
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getHibernateTemplate().execute(new HibernateCallback(){ 5NeEDY2%#
publicObject doInHibernate B69 NL
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(Session session)throws HibernateException { 4(YKwY2_L
Criteria criteria = +2W#=G
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detachedCriteria.getExecutableCriteria(session); T cSj`-
int totalCount = hgKs[ySo,3
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((Integer) criteria.setProjection(Projections.rowCount ^#%$?w>wI
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()).uniqueResult()).intValue(); f+$/gz
criteria.setProjection x%x:gkq
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(null); NP^kbF
List items = kG,6;aVZ8
?~S\^4]
criteria.setFirstResult(startIndex).setMaxResults XX}RbE#4
>&U]j*'4
(pageSize).list(); KY"W{D9ib
PaginationSupport ps = -\>Bphu,y
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new PaginationSupport(items, totalCount, pageSize, t_@%4Wn!1L
}N4=~'R
startIndex); +69sG9BA
return ps; ~`mOs1 d
} 0Km{fZYq7;
}, true); xp>ra2A
} 2lHJ&fck<
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public List findAllByCriteria(final R[Kyq|UyVr
m[ txKj.=_
DetachedCriteria detachedCriteria){ &Cdk%@Tj]B
return(List) getHibernateTemplate Ge[N5N>
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().execute(new HibernateCallback(){ $N5}N\C:a
publicObject doInHibernate i6(y Bn
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(Session session)throws HibernateException { )>$xbo")k
Criteria criteria = eSywWSdf0
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detachedCriteria.getExecutableCriteria(session); A^
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return criteria.list(); `2d ,=.X
} i v&:X3iB
}, true); RNp3lXf O
} hq$:62NYg
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public int getCountByCriteria(final m/%sBw\rx
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DetachedCriteria detachedCriteria){ Sep}{`u
Integer count = (Integer) oC.:mI
+!dIEt).U
getHibernateTemplate().execute(new HibernateCallback(){ 4wMKl6mL
publicObject doInHibernate r/+<_3
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(Session session)throws HibernateException { |zGwt Z
Criteria criteria = E,u@,= j
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detachedCriteria.getExecutableCriteria(session); "f(iQI
return .z7F58
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criteria.setProjection(Projections.rowCount BRFA%FZ,
+KrV!Taf
()).uniqueResult(); S;a{wYF6v
} PDzVXLpC
}, true); 2zh?]if
return count.intValue(); ZVR0Kzu?Ra
} IdUMoLL?
} 0^5SL/2
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用户在web层构造查询条件detachedCriteria,和可选的 IFH%R>={
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 0:@:cz=#*
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PaginationSupport的实例ps。 \@8$tQCZ
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ps.getItems()得到已分页好的结果集 [58xT>5`m
ps.getIndexes()得到分页索引的数组 5qGRz"\p~
ps.getTotalCount()得到总结果数 6K5KZZG
ps.getStartIndex()当前分页索引 w6'o<=
ps.getNextIndex()下一页索引 s{2BG9s
ps.getPreviousIndex()上一页索引 6,7Fl=<
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 @ZK#Y){
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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 {
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一下代码重构了。 :(c2YZ
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我把原本我的做法也提供出来供大家讨论吧: &kB[jz_[A
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首先,为了实现分页查询,我封装了一个Page类:
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java代码: :W_S
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/*Created on 2005-4-14*/ \7nlwFAO
package org.flyware.util.page; "Q`{+|'=E
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/** y,tA~
* @author Joa w;vp X>
* "!i7U2M'
*/ z%Ywjfn'
publicclass Page { 8c\mm 0n
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/** imply if the page has previous page */ #IDDKUE
privateboolean hasPrePage; j01.`G7Q
*r!1K!c
/** imply if the page has next page */ dGAthbWJ
privateboolean hasNextPage; ;TD<\1HJT=
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/** the number of every page */ 12])``9
privateint everyPage; Ih!UL:Ckh
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/** the total page number */ M.1R]x(|
privateint totalPage; eC%.xu^
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/** the number of current page */ 9Xmb_@7b}
privateint currentPage; G'q7@d{'
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/** the begin index of the records by the current Nc
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query */ AGQCk*dm
privateint beginIndex; 2GLq#")P
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/** The default constructor */ Mii-Q`.:
public Page(){ b[$%Wg
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} $]:I1I
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/** construct the page by everyPage V7%G?
* @param everyPage H@bra~k-
* */ 8N4W}YBs
public Page(int everyPage){ c!T^JZBb
this.everyPage = everyPage; St-:+=V_
} M7/P&d
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/** The whole constructor */ p<?~~7V
public Page(boolean hasPrePage, boolean hasNextPage, I7r{&X) D
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int everyPage, int totalPage, J?)vsnD.H
int currentPage, int beginIndex){ BWFl8
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this.hasPrePage = hasPrePage; 4*&x% ~*
this.hasNextPage = hasNextPage; EXH{3E54)`
this.everyPage = everyPage; h>sz@\{
this.totalPage = totalPage; 'Y(#Yxc
this.currentPage = currentPage; DQP#h5O
this.beginIndex = beginIndex; Jy@cMq2
} |Yh-`~~A"
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/** 0){%4
* @return /*`BGNkYY
* Returns the beginIndex. yT`[9u,
*/ \=Af AO@
publicint getBeginIndex(){ 6[$kEKOY=
return beginIndex; E:V&:9aQ@
} Fkuq'C<|Y
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/**
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* @param beginIndex OMd{rH
* The beginIndex to set. s=(~/p#M
*/ Q\z3YUk
publicvoid setBeginIndex(int beginIndex){ bR?-B>EB
this.beginIndex = beginIndex; ogs9obbZ!
}
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/** +cvz
* @return x,E#+
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* Returns the currentPage. ?u"(^93f
*/ aQCbRS6
publicint getCurrentPage(){ )PL'^gRr
return currentPage; ?)<zrE5p
} 8H./@~_ =
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/** iN*d84KTP
* @param currentPage |.=Ee+HZ
* The currentPage to set. BS;rit:
*/ M~I M;my
publicvoid setCurrentPage(int currentPage){ Vm'ReH
this.currentPage = currentPage; >ly= O
} G(JvAe]r
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/** (*&6XTV(
* @return c[!e*n!y
* Returns the everyPage. Id]WKL:
*/ t"2WJ-1k}
publicint getEveryPage(){ fdho`juFa
return everyPage; d`StBXG!
} P0RMdf
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/** PdMx6 Ab
* @param everyPage fTY @{t
* The everyPage to set. I-kM~q_
*/ :KgLjhj|)
publicvoid setEveryPage(int everyPage){ zVxiCyU
this.everyPage = everyPage; [H0jDbN
} tFwQ /
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/** >G'
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* @return o4Fh`?d}
* Returns the hasNextPage. 9`dQ7z.8t
*/ =)Ew6}
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publicboolean getHasNextPage(){ LN?T$H
return hasNextPage; &BG^:4b
} |1g2\5Re
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/** 7Yk6C5C
* @param hasNextPage :b=`sUn<X+
* The hasNextPage to set. s7FqE>#c0
*/ ~l CG37
publicvoid setHasNextPage(boolean hasNextPage){ v6s8 p
this.hasNextPage = hasNextPage; Zx}=c4I(y
} zZDG5_$n
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/** rcxV ,<[B
* @return eX?o4>
* Returns the hasPrePage. feNr!/
*/ 6 Y&OG>_\
publicboolean getHasPrePage(){ ' AeU
return hasPrePage; n9bX[+#d
} ji A$6dZU
3WPMS/
/** VxjHB?)
* @param hasPrePage MuZ\<;W$
* The hasPrePage to set. c1|o^ eZ
*/ ]a_;*Xq8d
publicvoid setHasPrePage(boolean hasPrePage){ }y=7r!{@
this.hasPrePage = hasPrePage; .a=M@;p
} bRNE:))r_
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/** ]P(Eo|)m
* @return Returns the totalPage. of+$TKQNpN
* Esw&ScBOP