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: 7Dx .;
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CountBean.java 8+g|>{Vov
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/* ^~YmLI4
* CountData.java LzEE]i
* 2jrX
* Created on 2007年1月1日, 下午4:44 {_k!!p6
* 7Da^Jv k
* To change this template, choose Tools | Options and locate the template under >FEQtD~F
* the Source Creation and Management node. Right-click the template and choose u}@%70A
* Open. You can then make changes to the template in the Source Editor. c-3Y SrY
*/ -V<=`e
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package com.tot.count; &s6(3k
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/** =Y=^]ayO/
* 46.q anh
* @author I;|5C=!
*/ [u9S+:7"
public class CountBean { B#Oc8`1Y
private String countType; d@q t%r3;
int countId; ui#1 +p3G
/** Creates a new instance of CountData */ 5>z:[OdY*
public CountBean() {} lG[
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public void setCountType(String countTypes){ sP8-gkkor
this.countType=countTypes; "#eNFCo7k
} W0uM?J\O
public void setCountId(int countIds){ H?/cG_^y0
this.countId=countIds; 7]HIE]#
} Ph7(JV{
public String getCountType(){
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return countType; C}DG'z9
} v,x%^gv 0
public int getCountId(){ ~M9n<kmE
return countId; \SH D
} KSpC%_LC
} :0TSOT9.
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CountCache.java 3K'o&>}L
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/* C{I8Pio{b
* CountCache.java ,*}g
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* w$_'xX(
* Created on 2007年1月1日, 下午5:01 E*!zJ,@8
* *IO;`k q,;
* To change this template, choose Tools | Options and locate the template under k
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* the Source Creation and Management node. Right-click the template and choose Wp9
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* Open. You can then make changes to the template in the Source Editor. |yl0}.()
*/ 5\*wX.wp
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package com.tot.count; |@bNd7=2d
import java.util.*; Z@aL"@2]a
/** RxDxLU2kt
* yfw>y=/p
* @author RT+30Q?
*/ hK9oe%kU~
public class CountCache { >J75T1PH=
public static LinkedList list=new LinkedList(); aBtfZDCfzp
/** Creates a new instance of CountCache */ [@l
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public CountCache() {} "j@IRuH
public static void add(CountBean cb){ HEfA c
if(cb!=null){ {HJ`%xN|
list.add(cb); IM&7h!
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} '8pPGh9D
} <n2{+eO
} I9j+x])
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CountControl.java kKk |@
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/* #?|1~HC
* CountThread.java @aPu}Hi
* 2Q_{2(nQb
* Created on 2007年1月1日, 下午4:57 ~aq?Kk
* 2] wf`9ZH
* To change this template, choose Tools | Options and locate the template under Q{|'g5(O
* the Source Creation and Management node. Right-click the template and choose g}og@UY7#
* Open. You can then make changes to the template in the Source Editor. IOES3
*/ wbF1>{/"
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package com.tot.count; &T/9yW[L
import tot.db.DBUtils; -0J<R;cVs
import java.sql.*; BMsy}08dQ
/** wk
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* ^VYZ%
* @author 9C'+~<l
*/ r
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public class CountControl{ mt6uW+t/
private static long lastExecuteTime=0;//上次更新时间 wTuRo
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 bFdg'_
/** Creates a new instance of CountThread */ d~bH!P
public CountControl() {} mbG^fy'
public synchronized void executeUpdate(){ WMz|FFKVY
Connection conn=null; 1B]wSvP@
PreparedStatement ps=null; d.(]V2X.J
try{ i$<v*$.o
conn = DBUtils.getConnection(); )^2jsy
-/
conn.setAutoCommit(false); g<0%-p
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); LFM5W&?
for(int i=0;i<CountCache.list.size();i++){ (IQ L`3f%
CountBean cb=(CountBean)CountCache.list.getFirst(); XK9*,WA9r
CountCache.list.removeFirst(); R\=\6( "
ps.setInt(1, cb.getCountId()); R#^pNJN
ps.executeUpdate();⑴ $A0]v!P~i-
//ps.addBatch();⑵ yT9RNo/w
} GN"LU>9|
//int [] counts = ps.executeBatch();⑶ GQAg
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conn.commit(); ^|12~d_.T
}catch(Exception e){ M]zNW{Xt
e.printStackTrace(); qf&{O:,Z
} finally{ 8[P6c;\
try{ l8Iy03H
if(ps!=null) { 7(iRz
ps.clearParameters(); hQLx"R$
ps.close(); E0%Y%PQ**{
ps=null; F"? *@L
} 1UWgOCc
}catch(SQLException e){} EC\:uK
DBUtils.closeConnection(conn); gK_[3FiKt
} b6M)qt9R
} mztq7[&-
public long getLast(){ 3\~fe/z'I
return lastExecuteTime; 3T^dgWXEG
} >N"PLSY1
public void run(){ MBrVh6z>
long now = System.currentTimeMillis(); pY5HW2TsY|
if ((now - lastExecuteTime) > executeSep) { @uD{`@[
//System.out.print("lastExecuteTime:"+lastExecuteTime); $>37PVVW
//System.out.print(" now:"+now+"\n"); !/9Sb1_ ~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ! { aA*E{
lastExecuteTime=now; 3$f5][+U
executeUpdate(); /'^>-!8_1
} tl#s:
else{ 6y!?xot
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); X(q=,^Mp
} ~a,'
} ]* Ki7h|B
} 1MFpuPJk
//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 | (9FV^_
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类写好了,下面是在JSP中如下调用。 m8A1^ R
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<% $d[:4h~
CountBean cb=new CountBean(); lD=j/
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `r$WInsDu
CountCache.add(cb); UoT}m^ G
out.print(CountCache.list.size()+"<br>"); ITPpT
CountControl c=new CountControl(); {/!"}{G1e
c.run(); w:(7fu=
out.print(CountCache.list.size()+"<br>"); ExU|EN-
%>