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:
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CountBean.java #QS?s8IrW
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/* -x5F;d}
* CountData.java
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* FB_NkXR
* Created on 2007年1月1日, 下午4:44 \OY}GRKt
* /?U!y?t&@
* To change this template, choose Tools | Options and locate the template under b` zET^F
* the Source Creation and Management node. Right-click the template and choose |EEi&GOR(y
* Open. You can then make changes to the template in the Source Editor. QXY}STs
*/ x)5LT}p
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package com.tot.count; o[^Q y(2~
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/** =ajLa/m'
* "&<~UiI
* @author &(7$&Q
*/ 0qR$J
public class CountBean { 59Nd}wPO;
private String countType; \447]<u
int countId; Yt*vqm[WV
/** Creates a new instance of CountData */ 4DM*^=9E
public CountBean() {} d- kZt@DL=
public void setCountType(String countTypes){ xl,ryc3J
this.countType=countTypes; Y;eoTJ
} Tyd
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public void setCountId(int countIds){ 6]ZO'Nwo
this.countId=countIds; |6*Va%LYO-
} 0
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public String getCountType(){ 9(OAKUQ
return countType; ju.OW`GM
} p6Gcts?,
public int getCountId(){ ayeCi8
return countId; Qsji0ikG
} 37jQ'O
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} LihdZ )
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CountCache.java `;/XK,m-
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/* R"{l[9j4>
* CountCache.java `I#`:hj
* *(Ro;?O,pi
* Created on 2007年1月1日, 下午5:01 aaT5u14%
* ,5.
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* To change this template, choose Tools | Options and locate the template under |*fNH(8&H
* the Source Creation and Management node. Right-click the template and choose ,Z5Fea
* Open. You can then make changes to the template in the Source Editor. %"+4
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*/ yzg9I
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package com.tot.count; +ouY
import java.util.*; ~#4~_d.=L
/** #D0W7a
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* @author ])UwC-l
*/ kC31$jMC3!
public class CountCache {
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public static LinkedList list=new LinkedList(); A_i zSzC1
/** Creates a new instance of CountCache */ bBG/gQ
public CountCache() {} N6q5`Ry
public static void add(CountBean cb){ }H2#H7!H
if(cb!=null){ l?<q
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list.add(cb); +`Fb_m)f
} ~QCA -Yud
} RJwb@r<v
} 8$m1eQ`{
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CountControl.java v8
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/* J^h'9iQpi
* CountThread.java FR["e1<0
* dE GX3 -
* Created on 2007年1月1日, 下午4:57 Vmtzig3w[
* 506V0]`/
* To change this template, choose Tools | Options and locate the template under F1J#Y$q~L
* the Source Creation and Management node. Right-click the template and choose ydup)[n
* Open. You can then make changes to the template in the Source Editor. {lMqcK
*/ j-6v2MH
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package com.tot.count; k% NrL@z
import tot.db.DBUtils; L20rv:W$h
import java.sql.*; >3!DOv
/** LyV#j>gD
* *F|+2?a:$
* @author &rP~`4Mkp
*/ @Kp1k> ov
public class CountControl{ w?S8@|MK
private static long lastExecuteTime=0;//上次更新时间 |@ *3^'
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 K-6p'|
/** Creates a new instance of CountThread */ 6i-*N[!U
public CountControl() {} )WmZP3$^TX
public synchronized void executeUpdate(){ 1\IZcJ {
Connection conn=null; {6:&
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PreparedStatement ps=null; 3;A$<s
try{ nd;O(s;
conn = DBUtils.getConnection(); 8m|x#*5fQl
conn.setAutoCommit(false); *W%'Di
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 5Xj|:qz<(
for(int i=0;i<CountCache.list.size();i++){ !?6.!2
CountBean cb=(CountBean)CountCache.list.getFirst(); qsTq*G
CountCache.list.removeFirst(); oc:x&`j
ps.setInt(1, cb.getCountId()); $ hoYkA
ps.executeUpdate();⑴ ,6RQvw
//ps.addBatch();⑵ !]G jIT]Oh
} /cYk+c
//int [] counts = ps.executeBatch();⑶ F@EZ;[
conn.commit(); K k`<f d
}catch(Exception e){ RyE_|]I62u
e.printStackTrace(); ,8~dz
} finally{ Zikm?(J
try{ <ZV7|'^
if(ps!=null) { WSS(Bm|B
ps.clearParameters(); sSV^5
ps.close(); w~]}acP
ps=null; F=:c5z
} $82zy q
}catch(SQLException e){} >j-
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DBUtils.closeConnection(conn); ],Ab cTX
} &*jixqzvn
} HwM/}-t
public long getLast(){ c[Yq5Bu{y
return lastExecuteTime; ]a=l^Pc(xN
} ..aK sSm(
public void run(){ }FZp840
long now = System.currentTimeMillis(); g&P9UW>qS
if ((now - lastExecuteTime) > executeSep) { -: C[P
//System.out.print("lastExecuteTime:"+lastExecuteTime); `!_? uT
//System.out.print(" now:"+now+"\n"); N4s$.`
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); [:B W+6
lastExecuteTime=now; 0O_E\- =
executeUpdate(); 0$!.c~
} sv@}x[L
else{ [|jIC
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); .N&QW
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} bu;vpNa
} ]Px:d+wX:
} XGL"gD
//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^3,X_0
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类写好了,下面是在JSP中如下调用。 )|Jr|8
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<% gl Li
CountBean cb=new CountBean(); >
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); %bN"bxv^
CountCache.add(cb); UX?X]ZYVR
out.print(CountCache.list.size()+"<br>"); "1AjCHZ
CountControl c=new CountControl(); :3:)E
c.run(); =\*S'Ded
out.print(CountCache.list.size()+"<br>"); POkXd^pI
%>