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: 07FS|>DM'Z
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CountBean.java =mWr8p-H
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/* T)Ohk(jK1
* CountData.java |)'6U3
* wEu"X
* Created on 2007年1月1日, 下午4:44 "?r=n@Kv
* _pZaVx
* To change this template, choose Tools | Options and locate the template under U|2*.''+Q
* the Source Creation and Management node. Right-click the template and choose F[HMX4
* Open. You can then make changes to the template in the Source Editor. 1B#Z<p
*/ #;*0 Pwe`
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package com.tot.count; WhY8#B'?
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/** "B9aJo
* 72;4
* @author A3jT;D9Y%
*/ Y%"6
public class CountBean { AR}q<k6E
private String countType; n@
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int countId; Kq. MmR!gl
/** Creates a new instance of CountData */ tOQura
public CountBean() {} PX%Y$`
public void setCountType(String countTypes){ cI
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this.countType=countTypes; gXzp$#
} #4Z]/D2G
public void setCountId(int countIds){ K@DK4{
this.countId=countIds; vI)-Zz[3
} `VB]4i}u
public String getCountType(){ LBs:O*;
return countType; ?jDdF
} U:[#n5g
public int getCountId(){ vxmz3ht,Q
return countId; 9N?BWv}
} bOKgR{i
} fQtV-\Bc
@}Y,A~
CountCache.java '&<T;V%
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/* ^/k`URQ
* CountCache.java uBPxMwohR
* V6.w=6:`X
* Created on 2007年1月1日, 下午5:01 U<|h4'(@L
* n%"0%A
* To change this template, choose Tools | Options and locate the template under p`
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* the Source Creation and Management node. Right-click the template and choose y&$mN
* Open. You can then make changes to the template in the Source Editor. p%_m!
*/ ?'I[[KuG
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package com.tot.count; @H?_x/qBT
import java.util.*; e{8j(` (;#
/** Xw|t.0
*
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* @author tmCm54
*/ e!:/enQo
public class CountCache { Fa!6*K\
public static LinkedList list=new LinkedList(); m^O9G?
/** Creates a new instance of CountCache */ AhjUFz
public CountCache() {} ylEQeN
public static void add(CountBean cb){ &vy/Vd
if(cb!=null){ .Y?/J,Ch
list.add(cb); &?-LL{W{
} ^YpA@`n
} <}^W9>u<
} 7:Jyu/*]
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CountControl.java z&"-%l.b@}
#..-!>lY
/* d]v4`nc
* CountThread.java KvFGwq"X
* I^5T9}>Q
* Created on 2007年1月1日, 下午4:57 ~"Pu6-\VT
* f-V8/
* To change this template, choose Tools | Options and locate the template under (Oc[j{6q
* the Source Creation and Management node. Right-click the template and choose Mbt}G|;8H7
* Open. You can then make changes to the template in the Source Editor. @Gs*y1
*/ "]j GCo>9
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package com.tot.count; Zl0Kv*S
import tot.db.DBUtils; S_z}h
import java.sql.*; {L!w/Ie X
/** G%a8'3d,
* FyZa1%Tv@
* @author \LFRu
*/ lF:gQ]oc
public class CountControl{ e$k]z HlQ
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 FBjIft5e
/** Creates a new instance of CountThread */ #xqeCX4p
public CountControl() {} ?G5JAG`
public synchronized void executeUpdate(){ <p48?+K9
Connection conn=null; H!F Cerg
PreparedStatement ps=null; *0 ;DCUv
try{ 58H [sM4>
conn = DBUtils.getConnection(); @#T*OH
conn.setAutoCommit(false); &CvNNDgrJ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); t'uZho~^F
for(int i=0;i<CountCache.list.size();i++){ `"0#lZ`n
CountBean cb=(CountBean)CountCache.list.getFirst(); _}X_^taTZS
CountCache.list.removeFirst(); >K{/ Jx&
ps.setInt(1, cb.getCountId()); f\Bd lOJ>
ps.executeUpdate();⑴ U9D4bn D
//ps.addBatch();⑵ YfC1.8
} or_x0Q
//int [] counts = ps.executeBatch();⑶ w_po5[]R
conn.commit(); ckqU2ETpD}
}catch(Exception e){ `;7^@ k
e.printStackTrace(); O a_2J#~$
} finally{ r5b5 `f4
try{ }5H3DavW
if(ps!=null) { %]JSDb=C
ps.clearParameters(); *p;Fwj]
ps.close(); "5mdq-h(
ps=null; 6i/x"vl>
} kji*7a?y
}catch(SQLException e){} AL/q6PWi
DBUtils.closeConnection(conn); OO@ (lt
} #vi `2F
} 1FU(j*~:
public long getLast(){ >]q{vKCAP
return lastExecuteTime; +'abAST
t
} nDnSVrvd-i
public void run(){ M,Q(7z?#5
long now = System.currentTimeMillis(); ]/!#:
if ((now - lastExecuteTime) > executeSep) { &B
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//System.out.print("lastExecuteTime:"+lastExecuteTime); UQ#"^`=R<
//System.out.print(" now:"+now+"\n"); #%U5,[<a8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ffK A
lastExecuteTime=now; !/G2vF"
executeUpdate(); <syMrXk)R(
} <6`_Xr7)
else{ *.wX9g9\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $:V'+s4o
} &