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: 03|nP$g
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CountBean.java ;xw9#.d#D
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/* Z/: yYSq
* CountData.java Jia@HrLR
* k0PwAt)65
* Created on 2007年1月1日, 下午4:44 qHe
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* \VIY[6sn\M
* To change this template, choose Tools | Options and locate the template under &@{`{
* the Source Creation and Management node. Right-click the template and choose i83Jy w,f
* Open. You can then make changes to the template in the Source Editor. W[`ybGR<
*/ _nzq(m1@
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package com.tot.count; 9'~qA(=.?
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/** Hr}"g@ <
* <W3p!
* @author [bo"!Qk%
*/ gU&+^e >
public class CountBean { FVP,$
private String countType; @,Dnl v|?
int countId; ^9hc`.5N&?
/** Creates a new instance of CountData */ 0)h.[O8@>
public CountBean() {} RWM~7^JA
public void setCountType(String countTypes){ n2AoEbd
this.countType=countTypes; _a"|
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} CpX[8>&osD
public void setCountId(int countIds){ 6.45^'t]
this.countId=countIds; ?uTuO
} 7u^wO<
public String getCountType(){ ,*lns.|n
return countType; V#b*:E.cA
} N`N=}&v ]
public int getCountId(){ a}VR>!b
return countId; h V`?,
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} W"#<r
} ?
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CountCache.java V?^qW#AG
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/* 5M)B
* CountCache.java .uX(-8n ~
* suhnA(T{
* Created on 2007年1月1日, 下午5:01 *Z.{1
* GpXf).a@
* To change this template, choose Tools | Options and locate the template under zN+jn
* the Source Creation and Management node. Right-click the template and choose r
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* Open. You can then make changes to the template in the Source Editor. L!/{Z
*/ ~KGE(o4p
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package com.tot.count; p'@z}T?F
import java.util.*; H)*%e G~
/** ^Vh^Z)gGi
* at*DYZBjDB
* @author bfJ<~ss/
*/ Z
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public class CountCache { &V&beq4)p
public static LinkedList list=new LinkedList(); `+TC@2-?
/** Creates a new instance of CountCache */ ,e`n2)
public CountCache() {} /N/jwLr
public static void add(CountBean cb){ 5 8U[IGs(
if(cb!=null){ cqZlpm$c
list.add(cb); \:n<&<aVSr
} <Z~Nz>'r
} 0_^3
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} 6+>X`k%D
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CountControl.java |N^8zo :
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/* V%M@zd?u.
* CountThread.java @Y9tkJIt
* "x_G6JE4tv
* Created on 2007年1月1日, 下午4:57 |w_l~xYV)
* \Y:zg3q*
* To change this template, choose Tools | Options and locate the template under a[!:`o1U
* the Source Creation and Management node. Right-click the template and choose XK0lv8(
* Open. You can then make changes to the template in the Source Editor. daQJ{Cd,w
*/ fE>JoQs38
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package com.tot.count; H}usL)0&&
import tot.db.DBUtils; URr{J}5
import java.sql.*; vsq
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/** f.v JJa
* CA/Lv{[2
* @author te>Op 1R
*/ J]NMqiq
public class CountControl{ shY8h
private static long lastExecuteTime=0;//上次更新时间 mLHl]xs4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ub4(g~E
/** Creates a new instance of CountThread */ ICWHEot
public CountControl() {}
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public synchronized void executeUpdate(){ gPpk0LZi
Connection conn=null; &_]bzTok
PreparedStatement ps=null; u$"Ew^C
try{ E,A9+OKxJ
conn = DBUtils.getConnection(); `7 Nk;
conn.setAutoCommit(false); `my\59T
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); jq/ CXYv
for(int i=0;i<CountCache.list.size();i++){ EhOB+Mc1
CountBean cb=(CountBean)CountCache.list.getFirst(); J@q!N;eh|
CountCache.list.removeFirst(); $|19]3T@Z
ps.setInt(1, cb.getCountId()); # *7ImEN
ps.executeUpdate();⑴ t0ZaI E
//ps.addBatch();⑵ bg*@N
} 7 z+Ngt' !
//int [] counts = ps.executeBatch();⑶ !@)tkhP
conn.commit(); 5%fR9?)
}catch(Exception e){ ~#P` 7G
e.printStackTrace(); j|r$!gV
} finally{ <ZoMKUuB
try{ n*eqM2L
if(ps!=null) { #4& <d.aw'
ps.clearParameters(); 5pxw[c53#
ps.close(); U;U19[]
ps=null; H<3ayp$
} M9(Kxux#
}catch(SQLException e){} Q2t>E(S
DBUtils.closeConnection(conn); zj;KtgcE
} Gwfi
} tj" EUqKQ
public long getLast(){ idZ]d6
return lastExecuteTime; g+ cH
} 1F[W~@jW
public void run(){ |+aD%'|
long now = System.currentTimeMillis(); D{]9s
if ((now - lastExecuteTime) > executeSep) { JjBlje
//System.out.print("lastExecuteTime:"+lastExecuteTime); k=.pcDX
//System.out.print(" now:"+now+"\n"); %uy?@ e
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); TI637yqCU
lastExecuteTime=now; v,)vW5jGI
executeUpdate(); k{+Gv}Y
} ;#dzw!+Y
else{ ~qb-uT\(99
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); o:RO(oA0?
} R-BN}ZS
} HVM(LHm=:
} PA${<wyBR_
//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 qyY]:
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类写好了,下面是在JSP中如下调用。 ?~rz'Pu~
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<% \GD\N=?~
CountBean cb=new CountBean(); gJZH??b
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); dHsI<