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: Go^a~Sf$
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CountBean.java 5Z8Zb.
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/* t(~V:+W 9
* CountData.java \@\r`=WgB
* JD\yl[ac%
* Created on 2007年1月1日, 下午4:44 ?"hrCEHV{9
* .Iu8bN(L`
* To change this template, choose Tools | Options and locate the template under 0f_+h %%=
* the Source Creation and Management node. Right-click the template and choose ]VKM3[
* Open. You can then make changes to the template in the Source Editor. ol[sX=5 *
*/ b(E}W2-t
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package com.tot.count; DPWt=IFU
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/** }]<Ghns
* Hto RN^9
* @author &g;&=<#I
*/ (yJY/|
public class CountBean { K]{x0A
private String countType; 5V $H?MW>
int countId; ?5IF;vk
/** Creates a new instance of CountData */ ,<CFjtelO
public CountBean() {} *2T"lpl
public void setCountType(String countTypes){ UR|Au'iu
this.countType=countTypes; WR.>?IG2E
} ?~:4O}5Ax
public void setCountId(int countIds){ /g]NC?
this.countId=countIds; Ueb&<tS
} 0X<U.Sxn
public String getCountType(){ o#Viz:
return countType; e0$.|+
} n1Wo<$#
public int getCountId(){ X
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return countId; <-h[I&."
} 1a]P+-@u[
} ;Tec)Fl
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CountCache.java W; zzc1v
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/* P!yOA_)as
* CountCache.java |
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* lD#S:HX
* Created on 2007年1月1日, 下午5:01 (
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* ]~@uStHn
* To change this template, choose Tools | Options and locate the template under xFzaVjjP
* the Source Creation and Management node. Right-click the template and choose zN&m-nrw
* Open. You can then make changes to the template in the Source Editor. pt%*Y.)az
*/ 4J{W8jX
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package com.tot.count; ]^0mh["
import java.util.*; }3/|;0j$
/** 2w;Cw~<=d
* M#.dF{%%
* @author !DkIM}.
*/ )agrx76]3w
public class CountCache { :I2spBx
public static LinkedList list=new LinkedList(); rM`z2*7%d
/** Creates a new instance of CountCache */ Rr0]~2R
public CountCache() {} Od+nBJ
public static void add(CountBean cb){ 'x,6t66*"l
if(cb!=null){ JYR^k=
list.add(cb); c{3P|O&.
} 0O?\0k;o
} =>-W!Of
} :0kKw=p1R
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CountControl.java T}jW,Ost
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/* zgl$ n
* CountThread.java ]zz%gZz
* #G\Ae:O
* Created on 2007年1月1日, 下午4:57 tN;^{O-(V
* uBw[|,yn2*
* To change this template, choose Tools | Options and locate the template under r-_-/O"l
* the Source Creation and Management node. Right-click the template and choose K_fJ{Vc>O
* Open. You can then make changes to the template in the Source Editor. cv_t2m
*/ ^ f[^.k$3d
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package com.tot.count; n5Mhp:zc,
import tot.db.DBUtils; j>3Fwg9V
import java.sql.*; "iJAM`Hi
/** L>pSE'}
* em2Tet
* @author b_)SMAsO7
*/ W~5gTiBZ]
public class CountControl{ tm.&k6%
private static long lastExecuteTime=0;//上次更新时间 tILnD1q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]}pAZd
/** Creates a new instance of CountThread */ I5E5,{
public CountControl() {} iV:\,<8d
public synchronized void executeUpdate(){ i "aQm
Connection conn=null; dKmPKeJM
PreparedStatement ps=null; ?lm<)y?I7+
try{ ]d*O>Pm
conn = DBUtils.getConnection(); Ch]q:o4
conn.setAutoCommit(false); @ev^e!B
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); q)PSHr=Z
for(int i=0;i<CountCache.list.size();i++){ [OFT!=.y &
CountBean cb=(CountBean)CountCache.list.getFirst(); nyZ?m
CountCache.list.removeFirst(); u1|v3/Q-
ps.setInt(1, cb.getCountId()); '.e5Ku
ps.executeUpdate();⑴ I.o3Old
//ps.addBatch();⑵ _k5$.f:Yj<
} mo]>Um'F
//int [] counts = ps.executeBatch();⑶ V/ZWyYxjLi
conn.commit(); <#~n+,
}catch(Exception e){ R(2MI}T
e.printStackTrace(); }dSFv
} finally{ 17VNw/Y
try{ .yb8<q s
if(ps!=null) { 4-\4G"4
ps.clearParameters(); Koz0Xy
ps.close(); M+4S >Sjw
ps=null; U}{\qs-z t
} <4;f?eu
}catch(SQLException e){} (; Zl
DBUtils.closeConnection(conn); obw:@i#
} vf`]
} }J=z O8OL
public long getLast(){ l> >BeZ
return lastExecuteTime; NmN:x&/
} XB%`5wwd
public void run(){ ,7e 2M@=
long now = System.currentTimeMillis(); =PoPp
if ((now - lastExecuteTime) > executeSep) { hy:K) _
//System.out.print("lastExecuteTime:"+lastExecuteTime); @T-}\AU
//System.out.print(" now:"+now+"\n"); Q1
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &J=x[{R
lastExecuteTime=now; .sUL5`
executeUpdate(); ,-BZsZ0~
} ||?wRMV
else{ qxD<mZ@-R0
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); tQ4{:WPG
} ^[zF IO
} =`%%*
} j0jam:.p
//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 \y/+H
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类写好了,下面是在JSP中如下调用。 o-t!z'\lO
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<% PiIILX{DuH
CountBean cb=new CountBean(); @aGS~^Uh
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ,<-a 6
CountCache.add(cb); )5bdWJ>l
out.print(CountCache.list.size()+"<br>"); YCQ+9
CountControl c=new CountControl(); Bb/aeLv
c.run(); 6d/b*,4[
out.print(CountCache.list.size()+"<br>"); 3!B3C(g
%>