有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: RBXoU'.
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CountBean.java UQFuEI<1-
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/* El%(je,|
* CountData.java -}J8|gwwp
* F\I^d]#,[
* Created on 2007年1月1日, 下午4:44 CmTJa5:
* =N
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* To change this template, choose Tools | Options and locate the template under epF>z
* the Source Creation and Management node. Right-click the template and choose d1-p];&
* Open. You can then make changes to the template in the Source Editor. S6mmk&n
*/ | QA8"&r
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package com.tot.count; H
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/** Fo#*_y5\
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* @author .kIf1-(<U
*/ xh0A2bw'OP
public class CountBean { s__g*%@B
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private String countType; 5IK@<#wE
int countId; 2. _cEY34
/** Creates a new instance of CountData */ 9m6j?CFG}
public CountBean() {} @-}]~|<
public void setCountType(String countTypes){ i`qh|w/b_
this.countType=countTypes; `2PT 8UM
} 9o`3g@6z
public void setCountId(int countIds){ 7 SZR#L
this.countId=countIds; :+Kesa:E
} 0h#M)Ft
public String getCountType(){ TE~@Bl;{?c
return countType; H JiP:{
} ]@YQi<d2^
public int getCountId(){ C)w*aU,(
return countId; ,whNh
} %*OJRL`
} ,)1e+EnV&
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CountCache.java
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/* H[
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* CountCache.java ;^]A@WN6_
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* Created on 2007年1月1日, 下午5:01 _=5ZB_I
*
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* To change this template, choose Tools | Options and locate the template under (#]KjpIK
* the Source Creation and Management node. Right-click the template and choose @{uc
* Open. You can then make changes to the template in the Source Editor. #EUgb7
*/ <Tf;p8#
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package com.tot.count; DlI5} Jh
import java.util.*; mI#; pO2
/** ]6 wi
* ?C35
* @author T*yveo&j
*/ "Ycd$`{Vgt
public class CountCache { <h9\ A&
public static LinkedList list=new LinkedList(); *.g?y6d
/** Creates a new instance of CountCache */ EB<q.
public CountCache() {} m{c#cR
public static void add(CountBean cb){ q;.]e#wvh
if(cb!=null){ G>QTPXcD
list.add(cb); sfE8b/Z8
} HU9y{H
} c ?XUb[
} .Er/t"Qs;
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CountControl.java 8
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/* JxJ ntsn
* CountThread.java +_P
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* PBtU4)
* Created on 2007年1月1日, 下午4:57 E e>j7k.G.
* uW=NH;u
* To change this template, choose Tools | Options and locate the template under &,]+>
* the Source Creation and Management node. Right-click the template and choose D|9fHMg%
* Open. You can then make changes to the template in the Source Editor. vWs c{9
*/ j*d~h$[k
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package com.tot.count; "|`9{/]
import tot.db.DBUtils; X>7]g670@
import java.sql.*; \*aLyyy3
/** <9a_wGs
*
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* @author bK9~C" k
*/ C)s1'
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public class CountControl{ GK?R76d
private static long lastExecuteTime=0;//上次更新时间 30+l0\1
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 vfJk?
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/** Creates a new instance of CountThread */ /
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public CountControl() {} -oBas4J
public synchronized void executeUpdate(){ yX3H&F6
Connection conn=null; )O C[;>F7
PreparedStatement ps=null; 3z92Gy5cr
try{ % T \N@
conn = DBUtils.getConnection(); H^;S}<pxW
conn.setAutoCommit(false); U^BXCu1km
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2 _n*u^X:_
for(int i=0;i<CountCache.list.size();i++){ 3Lki7QW`
CountBean cb=(CountBean)CountCache.list.getFirst(); ok%!o+nk.
CountCache.list.removeFirst(); ;<@6f @
ps.setInt(1, cb.getCountId()); rq["O/2
ps.executeUpdate();⑴
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//ps.addBatch();⑵ {))S<_yN
} OG7v'vmY
//int [] counts = ps.executeBatch();⑶ w*%$
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conn.commit(); zB"
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}catch(Exception e){ EZQ+HECpK
e.printStackTrace(); e.|RC
} finally{ hRIS[#z;U
try{ vx}Z
if(ps!=null) { Ej09RO"pB
ps.clearParameters(); 5|G3t`$pa
ps.close(); sJK:xk.6!
ps=null; IPi<sE
} ugCS &
}catch(SQLException e){} h?3l
DBUtils.closeConnection(conn); Ny,A#-?
} MI'l4<>u
} m_02"'
public long getLast(){ tO>OD#
return lastExecuteTime; 2$zq (
} a&
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public void run(){ >"g<-!p@
long now = System.currentTimeMillis(); vLFaZ^(
if ((now - lastExecuteTime) > executeSep) { OMI!=Upz
//System.out.print("lastExecuteTime:"+lastExecuteTime); y{Y+2}Dv/
//System.out.print(" now:"+now+"\n"); [Pwo,L,)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Po11EZa$a
lastExecuteTime=now; -s%-*K+,W
executeUpdate(); GL =XiBt
} s8Ry}{
else{ m2q;^o:J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); o / g+Z
} D4O5@KfL
} aU<D$I
} qvU$9cTY
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 yX.5Y|A<
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类写好了,下面是在JSP中如下调用。 NU&^7[!yl
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<% LF)a"Sh
CountBean cb=new CountBean(); \P~rg~
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]VG84bFm
CountCache.add(cb); K1/gJ9+(\
out.print(CountCache.list.size()+"<br>"); {&}/p-S
CountControl c=new CountControl(); 4IP\iw#w
c.run(); e(=~K@m
out.print(CountCache.list.size()+"<br>"); /z)3gsF
%>