Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 (0.JoeA`y
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 L/I ]
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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 KaHe(
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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 *K@O3n
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分页支持类: JnIG;/
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java代码: XW@C_@*J
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package com.javaeye.common.util; 2;3&&yK2b
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import java.util.List; fwMYEj
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publicclass PaginationSupport { qPWf=s7!
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publicfinalstaticint PAGESIZE = 30; rc~)%M<[2
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privateint pageSize = PAGESIZE; H\N}0^ea
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privateList items; w^YXnLLJG
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privateint totalCount; /C5py-I
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privateint[] indexes = newint[0]; ;l `Ufx
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privateint startIndex = 0; 8Q{9AoQ3'
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public PaginationSupport(List items, int :(tKc3z
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totalCount){ qLc&.O.=
setPageSize(PAGESIZE); 4;gw&sFF
setTotalCount(totalCount); ggYi 7Wzsd
setItems(items); F MYcZ+4
setStartIndex(0); @ PhAg
} -U?%A:,a|
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public PaginationSupport(List items, int 0Js5 '
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totalCount, int startIndex){ @\xEK5 SG
setPageSize(PAGESIZE); }1+2&Ps50
setTotalCount(totalCount); 5J&Gc;[p
setItems(items); _5O~]}
setStartIndex(startIndex); %W| Sl
} MPyDG"B *
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public PaginationSupport(List items, int g2'K3e?.%
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totalCount, int pageSize, int startIndex){ #UI`+2w
setPageSize(pageSize); Yl$@/xAa
setTotalCount(totalCount); l[m*csDk"
setItems(items); H1KXAy`&
setStartIndex(startIndex); K V?+9qa,
} AeN:wOm
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publicList getItems(){ yfR0vp<&
return items; KM"?l<x0Y
} 7!m<d,]N
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publicvoid setItems(List items){ >TawJ"q-6R
this.items = items; Nlwt}7
} Z("N
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publicint getPageSize(){ qt"6~r!
return pageSize;
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} ]W~M?1}
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publicvoid setPageSize(int pageSize){ D+ jvF
this.pageSize = pageSize; :P+7ti@
} f4NN?"W)
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publicint getTotalCount(){ XtBEVqrhi
return totalCount; R"CF xo
} yT7{,Z7t
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publicvoid setTotalCount(int totalCount){ ?@`5^7*
if(totalCount > 0){ $*P+
this.totalCount = totalCount; h4Arg~Or
int count = totalCount / -HuIz6
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pageSize; (dO0`wfM
if(totalCount % pageSize > 0) V|HO*HiB3
count++; (I>S qM
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indexes = newint[count]; |o(te
for(int i = 0; i < count; i++){ f.oY:3h:
indexes = pageSize * xUa9>=JU{
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i; ';D>Z?l
} l^}5PHLd
}else{ K>XZrt
this.totalCount = 0; J#iuF'%Ds
} wq1s#ag<
} `w@z
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publicint[] getIndexes(){ X(DP=C}v9
return indexes; "@5{=
} `Jj b4]
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publicvoid setIndexes(int[] indexes){ |Dq?<Ha
this.indexes = indexes; k][{4~z
} 0D `9
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publicint getStartIndex(){ n%~r^C_
return startIndex; $ >].;y?$
} QAZs1;lU
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publicvoid setStartIndex(int startIndex){ Y( K`3?A
if(totalCount <= 0) 55y{9.n*
this.startIndex = 0; - JFW ,8=8
elseif(startIndex >= totalCount) q9InO]s&~=
this.startIndex = indexes <&)zT#"
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[indexes.length - 1]; I{%(G(
elseif(startIndex < 0) #E<~WpP
this.startIndex = 0; 0XyPG
else{ [E2".F3
this.startIndex = indexes UalwK
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[startIndex / pageSize]; ;9J6)zg !n
} .uN(44^+x
} uLI;_,/:
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publicint getNextIndex(){ ?"?AH/E D
int nextIndex = getStartIndex() + 'C:i5?zh(q
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pageSize; h_\W7xt
if(nextIndex >= totalCount) 7W&XcF
return getStartIndex(); )RWukr+
else UKB/>:R
return nextIndex; +9<:z\B|
} X"HVK+
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publicint getPreviousIndex(){ |B^Picu
int previousIndex = getStartIndex() - ke/4l?zs
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pageSize; g^i\7'
if(previousIndex < 0) -ni@+Dy
return0; %)&Tr`
else 65RD68a
return previousIndex; g(Oor6Pp
} rO/Sj<0^
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} !)}z{,Jx
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抽象业务类 CWd
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java代码: Z
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/** n2[h`zm1{B
* Created on 2005-7-12 2IkyC`
*/ 7c@5tCcC-
package com.javaeye.common.business; :kjs: 6f]
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import java.io.Serializable; cVmF'g
import java.util.List; I0^oaccM
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import org.hibernate.Criteria; jOK!k
import org.hibernate.HibernateException; sY]pszjT
import org.hibernate.Session; [~n|R Oo
import org.hibernate.criterion.DetachedCriteria; : 'jVA
import org.hibernate.criterion.Projections; 87+u`~
import Dx9k%G)!
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org.springframework.orm.hibernate3.HibernateCallback; d9T:0A`M
import 5.kKg=a
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org.springframework.orm.hibernate3.support.HibernateDaoS q+w] Xs;
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upport; bp}]'NA
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import com.javaeye.common.util.PaginationSupport; z38Pi
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public abstract class AbstractManager extends |H5$VSw
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HibernateDaoSupport { Fa #5a'}I
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privateboolean cacheQueries = false; 8CvNcO;H0
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privateString queryCacheRegion; a% /x
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publicvoid setCacheQueries(boolean 'BVI ^H4
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cacheQueries){ `+UBl\j
this.cacheQueries = cacheQueries; cf%2A1I2W
} zYftgH_o
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publicvoid setQueryCacheRegion(String :8?l=B9("g
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queryCacheRegion){ V[7D4r.j
this.queryCacheRegion = A\.{(,;kp
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queryCacheRegion; gN<J0c)
} Scmew
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publicvoid save(finalObject entity){ V.ae 5@;
getHibernateTemplate().save(entity); &u(pBr8B
} O}6*9Xy
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publicvoid persist(finalObject entity){ @?t+O'&
getHibernateTemplate().save(entity); K>-01AGHL
} #X?E#^6?E
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publicvoid update(finalObject entity){ N4WX}
getHibernateTemplate().update(entity); A 0;ng2&
}
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publicvoid delete(finalObject entity){ 5<7sVd.
getHibernateTemplate().delete(entity); <anU#bEuQ
} ^r{N^
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publicObject load(finalClass entity, Y{X%C\
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finalSerializable id){ un)PW&~E
return getHibernateTemplate().load $vnx)#r3
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(entity, id); P|;f>*^Y
} R~RE21kAc
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publicObject get(finalClass entity, 5`::#[
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finalSerializable id){ D28>e
return getHibernateTemplate().get q$}gQ9'z'
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(entity, id); OM@z5UP
} $ao7pvU6
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publicList findAll(finalClass entity){ C!Fi &~
return getHibernateTemplate().find("from L#!m|_Mz
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" + entity.getName()); B}N1}i+
} r(zn1;zl
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publicList findByNamedQuery(finalString FY/F}C,o
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namedQuery){ s/P+?8'9
return getHibernateTemplate `9|Uu#x
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().findByNamedQuery(namedQuery); e&NJj:Ph*
} I(Vg
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publicList findByNamedQuery(finalString query, l}D /1~d
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finalObject parameter){ '7.4!I0'
return getHibernateTemplate ( F4c0
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().findByNamedQuery(query, parameter); g)IW9q2
} UM^~a$t
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publicList findByNamedQuery(finalString query, #+|0 o-
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finalObject[] parameters){ STPRC&7;
return getHibernateTemplate Lw<.QMN%f
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().findByNamedQuery(query, parameters); 1L=)93,M
} hOuHTo^
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publicList find(finalString query){ /.sho\a
return getHibernateTemplate().find isFxo,R9r
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(query); y'O<*~C(X
} 1r3}
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publicList find(finalString query, finalObject Xu|2@?l9
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parameter){ XaMsIyhI
return getHibernateTemplate().find ;f}
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(query, parameter); 4AKPS&k;
} <@Y`RqV +
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public PaginationSupport findPageByCriteria vD(:?M
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(final DetachedCriteria detachedCriteria){ o3h>)4
return findPageByCriteria 'p[B`Ft3F
\[ 4y
(detachedCriteria, PaginationSupport.PAGESIZE, 0); =uR3|U(.|u
} Sar1NkD#
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public PaginationSupport findPageByCriteria 4`")aM
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(final DetachedCriteria detachedCriteria, finalint GH`y-Ul'K
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startIndex){ (ki= s+W-
return findPageByCriteria {P)O#
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(detachedCriteria, PaginationSupport.PAGESIZE, @7{.err!
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startIndex); Gz(l~!n~a
} L<6nM
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public PaginationSupport findPageByCriteria aP
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(final DetachedCriteria detachedCriteria, finalint )mjGHq2
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pageSize, lR]FQnZ
finalint startIndex){ {.J<^V
return(PaginationSupport) j-ob7(v)*]
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getHibernateTemplate().execute(new HibernateCallback(){ PX` xr1o
publicObject doInHibernate 6E.[F\u
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(Session session)throws HibernateException { DgB;6Wl
Criteria criteria = _/Ay$l;F
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detachedCriteria.getExecutableCriteria(session); k(_OhV_
int totalCount = \r [@A3O
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((Integer) criteria.setProjection(Projections.rowCount 08! _B\
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()).uniqueResult()).intValue(); P!!O~P
criteria.setProjection \C4wWh-A
{SD%{
(null); ekqS=KfWl;
List items = .K`n;lVs
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criteria.setFirstResult(startIndex).setMaxResults ^66OzT8A
=YD<q:n4
(pageSize).list(); ukRmjHbLf
PaginationSupport ps = =&(e* u_
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new PaginationSupport(items, totalCount, pageSize, @.`k2lxGd~
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startIndex); [jrfh>v
return ps; Gl[1K/,*
} 5u3KL
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}, true); i'\-Y]?[
} ?CcX>R-/
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public List findAllByCriteria(final F/3L^k]
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DetachedCriteria detachedCriteria){ q- 0q:
return(List) getHibernateTemplate LXPO@2QF
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().execute(new HibernateCallback(){ C%CgWO`Xj
publicObject doInHibernate q?@*
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(Session session)throws HibernateException { \&ki79Ly-
Criteria criteria = )d2:r 07a
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detachedCriteria.getExecutableCriteria(session); oXN(S:ZF
return criteria.list(); CF@*ki3X
} 3i'01z
}, true); XODp[+xEEt
} WWo"De@
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public int getCountByCriteria(final :"H?phk
*'\ HG
DetachedCriteria detachedCriteria){ G?61P[j7
Integer count = (Integer) {F S)f
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getHibernateTemplate().execute(new HibernateCallback(){ ck3+A/ !z
publicObject doInHibernate 'GiN^Y9dcc
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(Session session)throws HibernateException { -=5~-72~
Criteria criteria = 6NHP/bj<1V
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detachedCriteria.getExecutableCriteria(session); \fuz`fK:
return S\Le;,5Z
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criteria.setProjection(Projections.rowCount ~*<`PD O?
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()).uniqueResult(); GlRjbNW?Q
} 'cQ,;y
}, true); +{C)^!zBK
return count.intValue(); d2^/
} K_-m:P
} q ywl
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用户在web层构造查询条件detachedCriteria,和可选的 kqxq'Aq)d
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 X%kJ3{
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PaginationSupport的实例ps。 |]k,0Y3v
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ps.getItems()得到已分页好的结果集 noEl+5uY
ps.getIndexes()得到分页索引的数组 N:'!0|6?x-
ps.getTotalCount()得到总结果数 C=v+e%)x@
ps.getStartIndex()当前分页索引 +v:]#1
ps.getNextIndex()下一页索引 vqO#Z
ps.getPreviousIndex()上一页索引 dNF_T?E\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 pV_zePyOn
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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 :N"&o(^
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一下代码重构了。 [@8 po-()L
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我把原本我的做法也提供出来供大家讨论吧: MPy><J
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首先,为了实现分页查询,我封装了一个Page类: 4z26a
java代码: a?8)47)
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/*Created on 2005-4-14*/ }4H}*P> +
package org.flyware.util.page; WBkx!{\z
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/** 75R#gQ]EV
* @author Joa !MOsP<2
* zUZET'Bm9
*/ 5>daWmD
publicclass Page { T!>h Pg
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/** imply if the page has previous page */ A9u>bWIE7
privateboolean hasPrePage; m)"(S
@G=7A;-pv0
/** imply if the page has next page */ kR^h@@'F"
privateboolean hasNextPage; )T^wc:
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/** the number of every page */ ^blw\;LB
privateint everyPage; DI2e%`$
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/** the total page number */ !Ko>
privateint totalPage; !G0Mg; ,
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/** the number of current page */ ;in-)`UC!
privateint currentPage; :yJ([
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/** the begin index of the records by the current Zv=pS
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query */ "VSx?74q
privateint beginIndex; Ak('4j!*}^
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/** The default constructor */ /2c(6h
public Page(){ s@7h oU-+
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} 4;CI<&S
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/** construct the page by everyPage 3W_7xLA
* @param everyPage cSV&p|
* */ uL1lB@G@
public Page(int everyPage){ 5;p|iT
this.everyPage = everyPage; S7nx4c2xK~
} q oi21mCn
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/** The whole constructor */ z},\1^[
public Page(boolean hasPrePage, boolean hasNextPage, Ddg!1SF
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int everyPage, int totalPage, 0'$67pY
int currentPage, int beginIndex){ lN,a+S/'
this.hasPrePage = hasPrePage; \y(3b#
this.hasNextPage = hasNextPage; 7(h@5
this.everyPage = everyPage; $ B&ZnZ?
this.totalPage = totalPage; EA8plQ~GtE
this.currentPage = currentPage; RtHai[j
this.beginIndex = beginIndex; "0#(<zb|
} !bYVLFp=\_
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/** g0U?`;n$
* @return ckY#oRQ1
* Returns the beginIndex. #Pf<2S
*/ <4vCx
publicint getBeginIndex(){ R<6y7?]bZ
return beginIndex; Qg(;>ops
} }8aqSD<:
SE^l`.U@
/** :?g+\:`/0j
* @param beginIndex };9s8VZE
* The beginIndex to set. ,h'Q
*/ 9wldd*r
publicvoid setBeginIndex(int beginIndex){ &,jUaC5I
this.beginIndex = beginIndex; p!^K.P1 '
} 8zj&e8&v
U), HrI>;
/**
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* @return Y)5O %@Rl
* Returns the currentPage. la-:"gKC
*/ *!&?Xy%\"j
publicint getCurrentPage(){ [Tbnfst
return currentPage; tJ >>cFx
} !o_eK\p
vn$=be8l4
/** W$NFk(
* @param currentPage :dULsl$Nz
* The currentPage to set. 6?<lS.s
*/ Y!_c/ !Tx
publicvoid setCurrentPage(int currentPage){ O$m &!J
this.currentPage = currentPage; GAYn*'<
} K&NH?
;)CN=J!
/** 1@t.J>
* @return ki@C}T5
* Returns the everyPage. H8? Y{H
*/ xp95KxHHo
publicint getEveryPage(){ .Hqq!&
return everyPage; 5=
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} Y8v[kuo7
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/** T:{r*zLSN
* @param everyPage [(#)9/3,
* The everyPage to set. # M/n\em"X
*/ Wd)\r.pJ
publicvoid setEveryPage(int everyPage){ !JrKTB%
this.everyPage = everyPage; hZ
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} 5yoi;$~}_0
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/** j;_
* @return ?i#x13
* Returns the hasNextPage. JXe~
9/!
*/ ly*v|(S&
publicboolean getHasNextPage(){ CQ/+- -o
return hasNextPage; Eq;w5;7s
} aaY AS"/:
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/** } (-9d
* @param hasNextPage CV"}(1T
* The hasNextPage to set. zE$HHY2ovi
*/ !PEKMDh
publicvoid setHasNextPage(boolean hasNextPage){ FauASu,A
this.hasNextPage = hasNextPage; sa o &
} h>GbJ/^
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/** `+\$
* @return 9Q s5e
* Returns the hasPrePage. /}U)|6-B
*/ eQ/w
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publicboolean getHasPrePage(){ #n|5ng|CJ
return hasPrePage; =oL:|$Pj
} PL$XXj>|:
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/** ^" ?a)KC
* @param hasPrePage
{q8|/{;
* The hasPrePage to set. :+jg311}
*/ `&q+ f+z
publicvoid setHasPrePage(boolean hasPrePage){ N^[
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this.hasPrePage = hasPrePage; >VIFQ\
} 2ak]&ll+h
k
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/** TU~y;:OJ
* @return Returns the totalPage. mp$IhJ6#
* `Pj7:[."[
*/ er3~gm
publicint getTotalPage(){ v0 :n:q
return totalPage; A9BoH[is7
} qfJ2iE|o2.
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/** JX5/PCO
* @param totalPage 0$Rn|yqf%
* The totalPage to set. ~\NQkaBkY
*/ 7MrHu2rZ=
publicvoid setTotalPage(int totalPage){ \os"w "
this.totalPage = totalPage; "]]LQb$
} )yig=nn
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} !% W5@tN
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pIK:$eN!/
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*Ts$Hj[
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 "QXnE^
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个PageUtil,负责对Page对象进行构造: >Df;1:U
java代码: >e6 OlIW
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/*Created on 2005-4-14*/ q9ra
package org.flyware.util.page; 5"57F88Y1
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import org.apache.commons.logging.Log; PV~D;
import org.apache.commons.logging.LogFactory; cb)7$S
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/** |-S!)iG1V
* @author Joa *> nOL
* bskoi;)u
*/ p#P<V%
publicclass PageUtil { QjSWl,{
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#b428-
privatestaticfinal Log logger = LogFactory.getLog 1ds4C:M+<
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(PageUtil.class); MFa/%O_*
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/** (,o@/ -o
* Use the origin page to create a new page |T"vF`Kr(>
* @param page /"La@M37
* @param totalRecords W3UxFs]$
* @return T:{&eWH
*/ "A
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publicstatic Page createPage(Page page, int T_Tu>wQX
!~?/D
totalRecords){ "0PsCr}!
return createPage(page.getEveryPage(), {u
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page.getCurrentPage(), totalRecords); =6ru%.8U,
} 1gBLJ0q
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/** N}n3 +F
* the basic page utils not including exception [5IbR9_
Co(N8>1
handler Wm-$l
* @param everyPage %D#&RS
* @param currentPage <v -YMk@
* @param totalRecords y(g]:#
* @return page 00i MU
*/ Ddq*}Pf0K
publicstatic Page createPage(int everyPage, int J2x}@p
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currentPage, int totalRecords){ Z|*#)<|~
everyPage = getEveryPage(everyPage); l9|K,YVW
currentPage = getCurrentPage(currentPage); zT)cg$8%fY
int beginIndex = getBeginIndex(everyPage, .>TG{>sH
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currentPage); Ot47.z
int totalPage = getTotalPage(everyPage, #lqH/>`>
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totalRecords); '/UT0{2;rS
boolean hasNextPage = hasNextPage(currentPage, UVlB=
,h1\PT9ULY
totalPage); ,_YI:xie|c
boolean hasPrePage = hasPrePage(currentPage); ZJWpb
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returnnew Page(hasPrePage, hasNextPage, cA4?[F
everyPage, totalPage, C@ q#s
currentPage, [N~7PNd S
#'KM$l,P
beginIndex); `qmwAT
} 6 L4\UTr
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privatestaticint getEveryPage(int everyPage){ !4+Die X
return everyPage == 0 ? 10 : everyPage; {G vGV
} lq53
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privatestaticint getCurrentPage(int currentPage){ m4OnRZYlw
return currentPage == 0 ? 1 : currentPage; -E6av|c,F
} )! rD&l$tE
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privatestaticint getBeginIndex(int everyPage, int /q>ExXsEC
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currentPage){ tgCp2`n
return(currentPage - 1) * everyPage; 9*FA=E
} p<dw C"z
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privatestaticint getTotalPage(int everyPage, int -eK0 +beQ
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totalRecords){ "2C}Pr,p8
int totalPage = 0; eSObOG/
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if(totalRecords % everyPage == 0) k0I$x:c
totalPage = totalRecords / everyPage; S_Nm?;P
else SbX^DAlB1
totalPage = totalRecords / everyPage + 1 ; 'q;MhnU+
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return totalPage; /cdLMm:
} 8wd["hga<%
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privatestaticboolean hasPrePage(int currentPage){ |7,$.MK-@
return currentPage == 1 ? false : true; uZ_?x~V/
} H74'I}
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privatestaticboolean hasNextPage(int currentPage, ~DxuLk6
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int totalPage){ V}<<?_
return currentPage == totalPage || totalPage == fFbJE]jW
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0 ? false : true; 11QZ- ^
} j^b&Q
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} Y'P^]Q=}_#
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 @(=?x:j
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 3`SH-"{j%
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做法如下: !p\
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1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 /J-.K*xKt
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的信息,和一个结果集List: K($+ILZ
java代码: g8Y)90 G
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/*Created on 2005-6-13*/ `xv Uq\
package com.adt.bo; >J;J&]Olf
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import java.util.List; z<