Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 N:y3tpG
%-6I
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 [8VB"{{&
Jz!8Xg%a
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 tCk;tu!d
P>dMET
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 L.[ H
H-9%/e
。 (
*(#;|m
GB(o)I#h
分页支持类: Xw=>L#Q
<.0-K_
java代码: .]qj];m
?dukK3u
L>Y>b4oy3
package com.javaeye.common.util; +oZq~2?*S6
8}\Lt
import java.util.List; 1Z +3=$P
Bf;dp`(/
publicclass PaginationSupport { cp0@wC#d
,OX(z=i_
publicfinalstaticint PAGESIZE = 30; O;9'0-F ?
S=>54!{`x
privateint pageSize = PAGESIZE; bUf2uWy7
,c@^u6a
privateList items; eU"!X9
z O
privateint totalCount; Tw< N
1 f ]04TI
privateint[] indexes = newint[0]; dyRKmLb
M1^?_;B
privateint startIndex = 0; C:/O]slH
{$,e@nn
public PaginationSupport(List items, int P {x`eD0
r^mP'#
totalCount){ >;eWgQ6V
setPageSize(PAGESIZE); Fu0 dYN
setTotalCount(totalCount); (PjC]`FK
setItems(items); M-3kF"
setStartIndex(0); H 3YFbR
} "P<IQx
`Ym7XF&
public PaginationSupport(List items, int kh/n|2
.7Zb,r
totalCount, int startIndex){ 37DyDzW)'
setPageSize(PAGESIZE); Xm./XC
setTotalCount(totalCount); e`%U}_[d
setItems(items); -t_t3aU|
setStartIndex(startIndex); UI}v{05]
} !rzbm&@
sK8=PZ\
public PaginationSupport(List items, int ufE;rcYE
eAh~`
totalCount, int pageSize, int startIndex){ -xS{{"-
setPageSize(pageSize); 7U>Xi'?
setTotalCount(totalCount); 5qzFH,
setItems(items); F!*u}8/_!
setStartIndex(startIndex); Tf/jd 3>
} ~0"(C#l9
\ s^a4l2
publicList getItems(){ n,hl6[O L7
return items; sdF;H[
} m~cz
kH'LG! O
publicvoid setItems(List items){ (_h<<`@B
this.items = items; 36mp+}R#
} ol QT r
2Wwzcvs@
publicint getPageSize(){ c5x2FM z
return pageSize; e 4-
} (}ObX!,
npC:SrI%
publicvoid setPageSize(int pageSize){ eT33&:n4
this.pageSize = pageSize; '4-J0S<<_
} b&[bfM<
UnSi= uj
publicint getTotalCount(){ qxKW%{6o
return totalCount; to-DXT.
} /J''`Tf
O@*^2, 6
publicvoid setTotalCount(int totalCount){ ~6YTm6o
if(totalCount > 0){ a;a^- n|D
this.totalCount = totalCount; ?=zF]J:G1w
int count = totalCount / MIa#\tJj
/-%0y2"7
pageSize; 9e5XS\
if(totalCount % pageSize > 0) qiEw[3Za]'
count++; Hw"LoVh
indexes = newint[count]; t}FwS6u
for(int i = 0; i < count; i++){ O5X@'.#rU
indexes = pageSize * RuyqB>[o
JZ=ahSi
i; :wWPEhK
} $?x;?wS0V
}else{ l9Xz,H
this.totalCount = 0; 4FwtC"G3
} {`RCh]W
} ckDWY<@v
bhk:Szqz
publicint[] getIndexes(){ i|N%dl+T=
return indexes; ~9Xs=S!
} |q+3X)Y
[f ._w~
publicvoid setIndexes(int[] indexes){ DIAHIV<
this.indexes = indexes; LVHIQ9
} ''p7!V?
{H F,F=W
publicint getStartIndex(){ lftT55Tki
return startIndex; }N^3P0XjYq
} `1xJ1z#
yj<j>JtN
publicvoid setStartIndex(int startIndex){ S/?!ESW6
if(totalCount <= 0) V^S` d8?
this.startIndex = 0; y)//u:l
elseif(startIndex >= totalCount) :"G x
this.startIndex = indexes {tKi8O^Rb
[B_(,/?
[indexes.length - 1]; Ca]V%g(
elseif(startIndex < 0) `4Db( ~
this.startIndex = 0; P<E!ix
else{ Uo]x6j<
this.startIndex = indexes 7my7|s[
_6Z}_SiOl
[startIndex / pageSize]; a_V.mu6h6p
} g&]n:qx
} W)LtnD2 w
jhx @6[
publicint getNextIndex(){ o[Gp *o\
int nextIndex = getStartIndex() + b<E0|VW
^J-"8%
pageSize; KlbUs\E
if(nextIndex >= totalCount) ^630%YO
return getStartIndex(); <jz\U7TBf
else yN/Uyhq
return nextIndex; cedH#;V!j
} 2EAY`}Rl6.
[g Y.h/
publicint getPreviousIndex(){ hsJS(qEh.'
int previousIndex = getStartIndex() - * .P3fVlZ
-.
J@
pageSize; VT:m!<^
if(previousIndex < 0) gPf^dGi7t
return0; R=m9[TgBm
else j"Y5j
B`
return previousIndex; ;n2b$MB?nM
} ^2<nn op
;)rs#T;$
} /9k}Ip
41s [p56+@
Xxmvg.Nl
:/6gGU>pu
抽象业务类 -guVl4 V
java代码:
1k39KO@
A1kqWhg\
y0b FzR9
/** ;FH_qF`.
* Created on 2005-7-12 D Kng.P
*/ cuUlr
package com.javaeye.common.business; R)u ${
~'3hK4
import java.io.Serializable; F qH@iZ
import java.util.List; >G<.^~o
]>"q>XgnI
import org.hibernate.Criteria; 4K<T_B/
import org.hibernate.HibernateException; maINp"#
import org.hibernate.Session; mj^]e/s%
import org.hibernate.criterion.DetachedCriteria; (Gp|K6
import org.hibernate.criterion.Projections; nq3B(
import +ug[TV
F3,djZq
org.springframework.orm.hibernate3.HibernateCallback; t^(#~hx
import =F>nqklc
> qDHb'
org.springframework.orm.hibernate3.support.HibernateDaoS z ;KUIWg
>x6$F*:W}
upport; NX5NE2@^qH
%. -nZ C
import com.javaeye.common.util.PaginationSupport; 69tT'U3vb$
HZ.Jc"+M
public abstract class AbstractManager extends S&w(H'4N
8~s-@3J
HibernateDaoSupport { j6.'7f5M<H
{V*OYYI`R
privateboolean cacheQueries = false; j9IeqlL
Zd]2>h
privateString queryCacheRegion; AG==A&d>$
R404\XGL
publicvoid setCacheQueries(boolean DHO+JtO
KJLK]lf}d
cacheQueries){ TR([u
this.cacheQueries = cacheQueries; g0~3;y
} O&c~7tM%
Z<t(h=?
publicvoid setQueryCacheRegion(String *E- VS= #
B,dHhwO*l
queryCacheRegion){ GOeYw[Vh
this.queryCacheRegion = FII>6c
>|e>=
queryCacheRegion; T2$V5RyX
} H%\\-Z$#
1 n86Mp1.e
publicvoid save(finalObject entity){ {=K u9\
getHibernateTemplate().save(entity); ]CIZF,
} nPj/C7j
8(Y=MW;g
publicvoid persist(finalObject entity){ rLm:qu(F1
getHibernateTemplate().save(entity); V,@Y,
} b@&ydgmaQ
^9Je8 @Yu
publicvoid update(finalObject entity){ yfD)|lK
getHibernateTemplate().update(entity); t,8p}2,$
} qt#a_F*rV
bof{R{3q
publicvoid delete(finalObject entity){ ; 7]Q'N
getHibernateTemplate().delete(entity); x_3Zd
} Je6=N3)
vG<JOxP
publicObject load(finalClass entity, V %cU@
Ye8&cZ*.
finalSerializable id){ y/}>)o4Q
return getHibernateTemplate().load w]{NaNIeq1
Czs4jHTa`
(entity, id); 8 '2lc
} srN>pO8u~
p5KM(N6f
publicObject get(finalClass entity, :q2tda
Y.Er!(pz
finalSerializable id){ w:z@!<
return getHibernateTemplate().get 042sjt
cs ?@Ri=g
(entity, id); &B^vHH
} X`ifjZ9}d
X^#.4:>.
publicList findAll(finalClass entity){ %^l77:O
return getHibernateTemplate().find("from qO<'_7TN[
+|OkT
" + entity.getName()); 3mIX9&/
} _[SP*"
]H
6/9h=-w&
publicList findByNamedQuery(finalString 3986;>v
"Yn<]Pa_
namedQuery){ F6T@YSP
return getHibernateTemplate [UI4YZu}
Q~4o{"3.'
().findByNamedQuery(namedQuery); -K`0`n}
} :5@cjj
Y"mD)\Bw?
publicList findByNamedQuery(finalString query, RGGP6SDc
<?P UF,
finalObject parameter){ Osb"$8im
return getHibernateTemplate '[p~|
mX
$2F*p#l(<Z
().findByNamedQuery(query, parameter); ,z)7rU`
} x#e(&OjN7
AQ-P3`bCb
publicList findByNamedQuery(finalString query, c7IgndVAV
0.nS306
finalObject[] parameters){ }0uSm%,"
return getHibernateTemplate yov:JnWo
{"e/3
().findByNamedQuery(query, parameters); sm}v0V.Js
} F5%-6@=
hX=+%^c%_A
publicList find(finalString query){ 0-g,C=L
return getHibernateTemplate().find L.15EXAB
4(&00#Yxg2
(query); C4Q^WU+$j
} <P( K,L?r
K4xZT+Qb
publicList find(finalString query, finalObject E]_lYYkA
Tp<=dH%$%"
parameter){ "twV3R
return getHibernateTemplate().find ]xf{.z
gi:;{
(query, parameter); AY0o0\6cw
} 9XS+W
w7
Q=gVxS
public PaginationSupport findPageByCriteria gSu+]N
D}!U?]la&
(final DetachedCriteria detachedCriteria){ . xX xjl
return findPageByCriteria *ARro
Ndr
^F`FB..:y
(detachedCriteria, PaginationSupport.PAGESIZE, 0); lyZof_/*
} "=|yM~V
yN~=3b>
public PaginationSupport findPageByCriteria SNff
#B'WT{B$/~
(final DetachedCriteria detachedCriteria, finalint J~<:yBup}
d&?B/E^
startIndex){ tq@<8?
return findPageByCriteria ,i*^fpF`F"
V}9wx%v
(detachedCriteria, PaginationSupport.PAGESIZE, ?ArQ{9c
wC=IN
startIndex); Ko''G5+
} X^9_'T9
%DPtK)X1
public PaginationSupport findPageByCriteria 9S6vU7W
!M^pL|
(final DetachedCriteria detachedCriteria, finalint LC[,K
}tv-
pageSize, c!Pi)
finalint startIndex){ qI;k2sQR
return(PaginationSupport) 2E2J=Do
uLhamE)
getHibernateTemplate().execute(new HibernateCallback(){ z0g]nYN%
publicObject doInHibernate .D4D!!
sur2Mw(M"
(Session session)throws HibernateException { J4lE7aFDA~
Criteria criteria = Fl*@@jQ8cV
&g)
`
detachedCriteria.getExecutableCriteria(session); L?9Vz&8]
int totalCount = S~Q7>oNm
%$]u6GKabi
((Integer) criteria.setProjection(Projections.rowCount CF42KNq
hH[JY(V
()).uniqueResult()).intValue(); i7fpl
criteria.setProjection O IewG5O
|UR.7rOV
(null); E/s3@-/
List items = JxD@y}ZYE
<o?qpW$,>
criteria.setFirstResult(startIndex).setMaxResults D;d;:WT5
UdL`.D,
(pageSize).list(); 7*`ldao~
PaginationSupport ps = qM1$?U
%&gx@ \v
new PaginationSupport(items, totalCount, pageSize, 2EK\QW o
aL=VNZ!Pqc
startIndex); C|!E'8Rw
return ps; 9wWjl}%
} MQG$J!N
}, true); 2_F`ILCML
} 8sbS7*#
rSEJ2%iF*
public List findAllByCriteria(final b<5:7C9z
#4cuNX5m%
DetachedCriteria detachedCriteria){ Yhlk#>I
return(List) getHibernateTemplate #d|.BxH
>nr1|2
().execute(new HibernateCallback(){ :'!?dszS
publicObject doInHibernate `L;I/Hp
r`7`f xe
(Session session)throws HibernateException { WHpbQQX
Criteria criteria = 'QW 0K]il
UoKBcarm
detachedCriteria.getExecutableCriteria(session); HQUL?URt
return criteria.list(); sPZa|AKHb
} j:sac*6m
}, true); Y":hb;&
} xMuy[)b
G&n_vwZ%
public int getCountByCriteria(final `$#64UZ>U1
k2;8~LqF
DetachedCriteria detachedCriteria){ u?'X%'K*
Integer count = (Integer) =8J\;h
fi,=z
getHibernateTemplate().execute(new HibernateCallback(){ ?ke C
publicObject doInHibernate hnY^Z_v!
~I^]O \?
(Session session)throws HibernateException { 0 /H1INve
Criteria criteria = H[G EAQO
<$=8'$T81
detachedCriteria.getExecutableCriteria(session); h|-r t15
return ev@1+7(
6>vj({,1Y*
criteria.setProjection(Projections.rowCount RdY #B;
i2!{.*.
()).uniqueResult(); @rJ#Dr
} hZJ Nh,,w
}, true); TZ*ib~
return count.intValue(); Em?skUnG,
} Cy2X>Tl"<E
} VtmUK$k}I
+22[ h@
8t7hN?,t
cCj3,s/p
N CsUC
S_WY91r
用户在web层构造查询条件detachedCriteria,和可选的 U$J]^-AS
UHg^F4>4
startIndex,调用业务bean的相应findByCriteria方法,返回一个 XH*^#c
]pGr'T~Gj
PaginationSupport的实例ps。 zzx4;C",u
Y/hay[6
ps.getItems()得到已分页好的结果集 G.N3R
ps.getIndexes()得到分页索引的数组 " DFg"
ps.getTotalCount()得到总结果数 IQ~()/;3d
ps.getStartIndex()当前分页索引
ew0 )
ps.getNextIndex()下一页索引 3 (<!pA
ps.getPreviousIndex()上一页索引 -^Lj~O
v0y7N_U5n
SVpe^iQ]1\
un/R7"
Zsuh 8t
+Rvj]vd}&
J|b1
K]
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 4 I~,B[|
WU\):n
,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 HW d,1
FStfGN
一下代码重构了。 C6Mb(&
p\HXE4d'
我把原本我的做法也提供出来供大家讨论吧: HC0puLt_
+g;G*EP7*
首先,为了实现分页查询,我封装了一个Page类: _]4cY%s
java代码: M-Js"cB[
N;w1f"V}
$M8'm1R9
/*Created on 2005-4-14*/ AD5t uY
package org.flyware.util.page; [DE8s[i-
h>n;A>k@N
/** jv7zvp
* @author Joa C +IXP
* 5M(?_qj
*/ '"TBhisky
publicclass Page { 7~65 @&P>
s)N1@RBR
/** imply if the page has previous page */ 7OZs~6(
privateboolean hasPrePage; oYF8:PYB
q4Z\y
/** imply if the page has next page */ !1l2KW<be
privateboolean hasNextPage; Wm
A:"!~M
z#\Z|OKU
/** the number of every page */ $""[(
d?0
privateint everyPage; ecFI"g
}C'z$i( y
/** the total page number */ 15zL,yo
privateint totalPage; saV3<zgx
R_*\?^k|A
/** the number of current page */ ~/NA?E-c
privateint currentPage; REt()$
7~
vxwctJ&
/** the begin index of the records by the current 7e40 }n
xJ3#k;
query */ Q`oi=OYB
privateint beginIndex; hcBfau; r
[$V_qFv{
)sL:iGU
/** The default constructor */ 9+/<[w7
public Page(){ >Z3}WMgBN
eg}|%GG
} ja:%j&:
A$oYw(m#
/** construct the page by everyPage K.cNx
* @param everyPage R1SEv$
* */ 6=& wY
public Page(int everyPage){
+Q'/c0o
this.everyPage = everyPage; :;JJvYIs
} P2oRC3~
$;@s
/** The whole constructor */ MTF:mLJ
public Page(boolean hasPrePage, boolean hasNextPage, xLGAP-mx]
fkx
9I m4
#fFEo)YG
int everyPage, int totalPage, H,uOshR
int currentPage, int beginIndex){ <}UqtDF 0
this.hasPrePage = hasPrePage; _h.[I8xgYG
this.hasNextPage = hasNextPage; p?!]sO1l
this.everyPage = everyPage; H8\N~>
this.totalPage = totalPage; 51rM6
BT
this.currentPage = currentPage; VE GUhI/d
this.beginIndex = beginIndex; ufm#H#n)#X
} }q~A( u
E`'+1
/** un\"1RdO
* @return 9(H8MUF0{
* Returns the beginIndex. i%z}8GIt'
*/ MjLyB^M
publicint getBeginIndex(){ PanyN3rC*
return beginIndex; mB!81%f%|
} yP"_j&ef7
gHm^@
/** Jw86P=
* @param beginIndex -nU_eDy
* The beginIndex to set. fCTjTlh
*/ ZLO_5#<
publicvoid setBeginIndex(int beginIndex){ O'p7^"M
this.beginIndex = beginIndex; ,>Yz1P)L
} 7u!p.kN
_o`'b80;
/** Maq{H`
* @return 1W-!f%
* Returns the currentPage. 7&+Gv6E
*/ lk+)-J-lj'
publicint getCurrentPage(){ @5kN
L~2
return currentPage; U"ga0X5
} QXF>xZ~
yJgnw6>r2
/** gzuM>lf*{
* @param currentPage m2 OP=z@)
* The currentPage to set. !Dun<\
*/ AA@J~qd
u
publicvoid setCurrentPage(int currentPage){ K;YK[M1!
this.currentPage = currentPage; dLo%+V#/A
} / P{f#rV5
7IFUsli]
/** {E@@14]g
* @return !.F`8OD`u
* Returns the everyPage. RJGf@am&
*/ fPspJug
publicint getEveryPage(){ E]+W^VG
return everyPage; &hZcjdB
} AU)Qk$c
(?~F}u
v
/** gmrjCLj
* @param everyPage ;;UvK
v
* The everyPage to set. _hXadLt
*/ .'SM|r$
publicvoid setEveryPage(int everyPage){ )L^WD$"'Q
this.everyPage = everyPage; m,8A2;&,8
} Oa*/jZjr
-B@jQg@
>
/** B9+oI cO
* @return 20hE)!A
* Returns the hasNextPage. kigc+R
*/ C[wnor!
publicboolean getHasNextPage(){ ~Fisno
return hasNextPage; EV]exYWB
} Kf(% aDYq
_Z2VS"yH
/** |QXW$
* @param hasNextPage b7HS3NYk
* The hasNextPage to set. As78yfK
*/ ~Ge-7^Fo7
publicvoid setHasNextPage(boolean hasNextPage){ I'J=I{p*
this.hasNextPage = hasNextPage; ?EKYKLwr
} 7CNEP2}:R
V18w
/** ]`+>{Sx 1
* @return ()XL}~I{!A
* Returns the hasPrePage. zYF'XB]4
*/ 2D&tDX<
publicboolean getHasPrePage(){ [L9e.n1
return hasPrePage; K2)),_,@5+
} :m-HHWMN
{8b6A~/
/** HQTB4_K\
* @param hasPrePage "jb?P$
* The hasPrePage to set. AY|8wf,LS
*/ YAd.i@^
publicvoid setHasPrePage(boolean hasPrePage){ hm?-QVRPV
this.hasPrePage = hasPrePage; ~pwp B2c
} -`#L rO;n
{ 5h6nYu
/** o^_z+JFwb
* @return Returns the totalPage. Kkdd }j
* ,I'Y)SLx
*/ f+ J<sk
publicint getTotalPage(){ g9p#v$V
return totalPage; q'{E $V)E
} !!dNp5h`
.(nq"&u-*
/** \)`\F$CF
* @param totalPage >.QD:_@:
* The totalPage to set. yD5T'np<4
*/ X]Sr]M^EK
publicvoid setTotalPage(int totalPage){ zgqe@;{
this.totalPage = totalPage; 6BNOF66kH
}
X1y1
2"JIlS;J}7
} q<.^DO~$L
d v"
*#dXW\8qu
NCl$vc;,
_9""3O
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 Kx$?IxZ
0.bmVN<
个PageUtil,负责对Page对象进行构造: Qx'a+kLu9
java代码: X -6Se
x1?p+
Cm(Hu
/*Created on 2005-4-14*/ qEX59v
package org.flyware.util.page; rJKX4,M
$Ob]JAf}
import org.apache.commons.logging.Log; HFvhrG
import org.apache.commons.logging.LogFactory; v)4 kS
bG;vl;C
/** __'Z0?.4#
* @author Joa <iv9Mg}
* %nVnK6[sox
*/ W)$;T%u
publicclass PageUtil { I)O%D3wfMW
Su6ZO'[)
privatestaticfinal Log logger = LogFactory.getLog #](ML:!
3zMmpeq
(PageUtil.class); `:?padZG
!\RR UH*
/** nakhepLN
* Use the origin page to create a new page 31<hn+pE&
* @param page %[&cy'
* @param totalRecords M\>y&'J-
* @return yEzp+Ky
*/ -GH#nF3G
publicstatic Page createPage(Page page, int cD-\fRBGK
ir3iW*5k
totalRecords){ 2m/1:5
return createPage(page.getEveryPage(), x.>z2.
!A&Vg #
page.getCurrentPage(), totalRecords); jKM-(s!(
} 4VD'<`R[
daY^{u3
/** jFbz:aUF
* the basic page utils not including exception IgR_p7['.
rS{Rzs^@
handler _dIv{L!
* @param everyPage W5EB+b49KM
* @param currentPage wa@X^]D8
* @param totalRecords (:vY:-\ bO
* @return page 3QM.X^ANH
*/ e8--qV#<
publicstatic Page createPage(int everyPage, int bmzs!fg_~R
oIQor%z
currentPage, int totalRecords){ 4}LGE>
everyPage = getEveryPage(everyPage); on\0i{0l8
currentPage = getCurrentPage(currentPage); {6a";Xj\e
int beginIndex = getBeginIndex(everyPage, 6(<M.U_ft
@1^iWM j
currentPage); xH; 4lw
int totalPage = getTotalPage(everyPage, OB;AgE@
s:i$ s")
totalRecords); 8{epy
boolean hasNextPage = hasNextPage(currentPage, 3:dQN;=
y[.0L!C {
totalPage); zA\DI]:+
boolean hasPrePage = hasPrePage(currentPage); =Q[5U9
z*I=
returnnew Page(hasPrePage, hasNextPage, OAc+LdT
everyPage, totalPage, UXR$ 7<D+
currentPage, Q~ te`
j""u:l^+x
beginIndex); lHT?
} !sK{:6s
vb\ UP&Ip
privatestaticint getEveryPage(int everyPage){ N=)N
return everyPage == 0 ? 10 : everyPage; s)8g4Yc*
} KZsSTB6J
+*lSB%`aS
privatestaticint getCurrentPage(int currentPage){ $l7
<j_C
return currentPage == 0 ? 1 : currentPage; AL3zE=BL
} $
[0
s@K|zOx
privatestaticint getBeginIndex(int everyPage, int AW%^Xt
Aum&U){yY
currentPage){ NIQNzq?a^
return(currentPage - 1) * everyPage; :
v<|y F
} m7cp0+Peo
305()
privatestaticint getTotalPage(int everyPage, int D)K/zh)
vRVQ:fw
totalRecords){ yI)~- E.
int totalPage = 0; _ ?xORzO
h/QZcA
if(totalRecords % everyPage == 0) C8e{9CF
totalPage = totalRecords / everyPage; bmGIxBRq
else n]r7} 2hM
totalPage = totalRecords / everyPage + 1 ; "!+q0l1]@
j_j~BXhIS
return totalPage; _r?H by<b
} wHEt;rc(
Dc}-wnga
privatestaticboolean hasPrePage(int currentPage){ DrC4oxS 1
return currentPage == 1 ? false : true; BwEO2a{
} zL+jlUkE
g-bHf]'
privatestaticboolean hasNextPage(int currentPage, |zKFF?7#wE
;S7MP`o@
int totalPage){ x32hO;
return currentPage == totalPage || totalPage == ?<%GYdus
@_J~zo
0 ? false : true; z)#I"$!d
} bLhTgss](
si.ZTG9m
LkK%DY
} wzwEYZN(q
@4#q
!9_HZ(W&
X3-pj<JLY
^KM' O8
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 mCb(B48]%X
>7V96jL$Y
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 iP]KV.e'/C
?\"GT] 5D
做法如下: ; :4&nJ*qG
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 PzMJ^H{
HIsIW%B
的信息,和一个结果集List: -GCC
java代码: ,&e0~
ikX"f?Q;S2
X ^8@T
/*Created on 2005-6-13*/ 7 XE&[o
package com.adt.bo; zo6|1xq
LmWZ43Z"@
import java.util.List; &kUEnwQ-
t~]n"zgovz
import org.flyware.util.page.Page; 6Ri+DPf:
ABb,]%
/** ,h,OUo]LIY
* @author Joa R/ix,GC
*/ P{fT5K|
publicclass Result { uatY:GSR
1yC_/Va1
private Page page; >cU#($X$^
-@L7!,j
private List content; nsn
!xk`oW
/** E:vgG|??
* The default constructor .j^tFvN~L
*/ -LzkM"
public Result(){ G5*"P!@6
super(); QTr)r;Tro
} /5:2g#S4
!z?&
/** 7>.d*?eao\
* The constructor using fields mxD]`F
* }uP`=T!"8
* @param page ncTPFv
H5
* @param content )|3BS`
*/ ,Tp:. "
public Result(Page page, List content){ WbJ|]}hJ\
this.page = page; =z>d GIT1
this.content = content; CWT#1L=
}
#zmt x0
1.24ZX
/** ^AhV1rBB
* @return Returns the content. x{DTVa
6y2
*/ mrmm@?
publicList getContent(){ n?Zt\Kto
return content; S)LvYOOB@
} #`]`gNB0Yg
R?{f:,3R
/** H!'Ek[s+
* @return Returns the page. mH.c`*
*/ t=nZ1GZyM
public Page getPage(){ T.(C`/VM
return page; :$6mS[@|
} |N5r_V
NF "|*S
/** []lMv
ZW
* @param content Ztl?*zL
* The content to set. M^ZEAZi
*/ KvjsibI/Y
public void setContent(List content){ C5Vlqc;
this.content = content; 5GK> ~2c(
} ;!S i_b2
XX7zm_>+
/** ;
,Nvg6c
* @param page lvAKL>qX
* The page to set. n'To:
*/ bvW3[ V
publicvoid setPage(Page page){ R$h
B9BK
this.page = page; 8vkCmV
} bMq)[8,N
} 7}1Z7"?
0fGt7 "Q
1%$t;R
=AcK9?%5
BZQ"[-V{
2. 编写业务逻辑接口,并实现它(UserManager, ToK=`0#LNK
_z=ytt9D
UserManagerImpl) ::p%R@?
java代码: s
!IvUc7'
2FN E ;y(
CwM1
_3cE
/*Created on 2005-7-15*/ ]GT+UX
package com.adt.service; \3&