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: 7Su#Je]
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CountBean.java W;1|+6x
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/* jn:NYJv
* CountData.java @G:V
* q|%(3,)ig
* Created on 2007年1月1日, 下午4:44 zz^F
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* 5P .qXA"D
* To change this template, choose Tools | Options and locate the template under >j{z>
* the Source Creation and Management node. Right-click the template and choose qiZO _=0
* Open. You can then make changes to the template in the Source Editor. NWd<+-pC6
*/ 4Td{;Y="yF
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package com.tot.count; 3&x-}y~sg
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/** ]7Fs$y.
* suH&jE$ x
* @author Nk[2nyeO>
*/ St<mDTi
public class CountBean { .@"q$\
private String countType; Q.Aw2
int countId; <jS~ WI@
/** Creates a new instance of CountData */ 5~.ZlGd
public CountBean() {} <F
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public void setCountType(String countTypes){ 0A:n0[V:]
this.countType=countTypes; fGv#s
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} zFQ&5@43
public void setCountId(int countIds){ #XnPsU<J
this.countId=countIds; $o +5/c?|
} !;Jmg
public String getCountType(){ jY6MjZI
return countType; TM8=U-A
} huudBc
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public int getCountId(){ 5`]UE7gT
return countId; nr)c!8
} 63!rUB!
} ?+c`]gO7N
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CountCache.java xvNo(>
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/* W-
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* CountCache.java 5/QRL\
* cE iu)2*e
* Created on 2007年1月1日, 下午5:01 SI_iI 71
* v_S4hz6w\
* To change this template, choose Tools | Options and locate the template under zKFp5H1!%+
* the Source Creation and Management node. Right-click the template and choose eh*6cQ.0
* Open. You can then make changes to the template in the Source Editor. Eh|.
*/ K\^ 0_F K
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package com.tot.count; IZ3{>NV
import java.util.*; 3u>8\|8wz
/** h7X_S4p/Mg
* 1ZJQs6
* @author N4K8
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*/ ^+SkCO
public class CountCache { PS
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public static LinkedList list=new LinkedList(); 'O6]0l
/** Creates a new instance of CountCache */ Gq#~vr
public CountCache() {} ,uz ]V1
public static void add(CountBean cb){ U6[ang'l
if(cb!=null){ ?4G|+yby
list.add(cb); Zs2-u^3&
} I =Wc&1g
} %g]vxm5?
} zu2HH<E
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CountControl.java >\<*4J$PZ
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/* :
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* CountThread.java U"f??y%)
* fQnwy!-\
* Created on 2007年1月1日, 下午4:57 sP'0Sl~NU
* 1\L[i];L8
* To change this template, choose Tools | Options and locate the template under (x;g/!:
* the Source Creation and Management node. Right-click the template and choose mgZf3?,)
* Open. You can then make changes to the template in the Source Editor. O;[9_[
*/ dz#5q-r
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package com.tot.count; %OcGdbs
import tot.db.DBUtils; Oq(VvS/
import java.sql.*;
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/** _kFYBd
* l_/C65%.:
* @author qJR!$?
*/ iO1nwl !#
public class CountControl{ aH_6s4+:
private static long lastExecuteTime=0;//上次更新时间 hbOnlj4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 rAdacnZV
/** Creates a new instance of CountThread */ Gi^Ha=?J%
public CountControl() {} .wrL3z_
public synchronized void executeUpdate(){ $\a5&1rl
Connection conn=null; :Zw@yt
PreparedStatement ps=null; MVv1.6c7Y
try{ {}>n{_
conn = DBUtils.getConnection(); pN[0YmY#
conn.setAutoCommit(false); IO.<q,pP!_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o**y Z2
for(int i=0;i<CountCache.list.size();i++){ %qsvtc`
CountBean cb=(CountBean)CountCache.list.getFirst(); Zs zs1{t
CountCache.list.removeFirst(); (y4#.vZh:
ps.setInt(1, cb.getCountId()); 2_QN&o ~h
ps.executeUpdate();⑴ d6 _C"r
//ps.addBatch();⑵ h7_)%U<J2
} K_-d(
//int [] counts = ps.executeBatch();⑶ *HM?YhR
conn.commit(); ,je`YEC
}catch(Exception e){ P}3}ek1Ax
e.printStackTrace(); GgFi9Ffj
} finally{ T&"i _no*
try{ ~H@+D}J?
if(ps!=null) { &[|VZ[
ps.clearParameters(); mjnUs-`W|
ps.close(); HO|-@yOF^
ps=null; xcCl
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} ":?T%v>
}catch(SQLException e){} zjX7C~h^Q
DBUtils.closeConnection(conn); "u')g&
} \Mx
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} @fn6<3
public long getLast(){ &$fbP5uAZ
return lastExecuteTime; j,%EW+j$
} T*q"N?/4
public void run(){ !#D=w$@r:
long now = System.currentTimeMillis(); bNzqls$
if ((now - lastExecuteTime) > executeSep) { }3/~x
//System.out.print("lastExecuteTime:"+lastExecuteTime); J>S3sP
//System.out.print(" now:"+now+"\n"); %.x@gi q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9 |:^k.
lastExecuteTime=now; U_z2J(e~
executeUpdate(); T>]sQPg
} t)1phg4H)
else{ <ZPZk'53<f
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F#q&(
} Db03Nk>#
} \ a-CN>
} Fq,N
//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 ddpl Pzm#
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类写好了,下面是在JSP中如下调用。 ?KN:r E
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<% DR+,Y2!_GT
CountBean cb=new CountBean(); ]YD(`42 x
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Y\t_&