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: :ho)3kB
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CountBean.java #LlHsY530N
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/* R}F0_.
* CountData.java .op:
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* hkw;W[ZWa
* Created on 2007年1月1日, 下午4:44 G l+[|?N
* .$+]N[-=
* To change this template, choose Tools | Options and locate the template under ZCi~4&Z#
* the Source Creation and Management node. Right-click the template and choose uhL+bj+W
* Open. You can then make changes to the template in the Source Editor. E6n3[Z
*/ kVs'>H@FY
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package com.tot.count; O"4Q=~Y
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/** A87JPX#R?
* ryzz!0l
* @author 'v^CA}
*/ c[]_gUp8
public class CountBean { bs!N~,6h
private String countType; 5uMh#dm^
int countId; <v;;:RB6c
/** Creates a new instance of CountData */ I*R[8|
public CountBean() {} _aVrQ@9
public void setCountType(String countTypes){ F)/}Q[o8
this.countType=countTypes; JqTkNKi/s
} _^Lv8a3(O
public void setCountId(int countIds){ ][-N<
this.countId=countIds; [-!
} I_@\O!<y}
public String getCountType(){ }}XYV eI
return countType; cZKK\hf<
} !=@Lyt)_b
public int getCountId(){ UKp- *YukT
return countId; {]plT~{e
} b:/ ;
} N+x0"~T}I
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CountCache.java /W'GX n
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/* hK"hMyH^
* CountCache.java Ei2Y)_
* 9;s:Bo
* Created on 2007年1月1日, 下午5:01 KE:PRX
* T1hr5V<U
* To change this template, choose Tools | Options and locate the template under ~U`oew
* the Source Creation and Management node. Right-click the template and choose B"T Z8(<
* Open. You can then make changes to the template in the Source Editor. Eq^k @
*/ k|Vq-w
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package com.tot.count; 5R}Qp<D[^
import java.util.*; V0 x[sEW
/** {~>?%]tf
* kA?a}
* @author Yu-e|:
*/ B7(~m8:eH7
public class CountCache { Q[_{:DJA
public static LinkedList list=new LinkedList(); T!5m'Q.
/** Creates a new instance of CountCache */ 8
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public CountCache() {} sfi.zuG
public static void add(CountBean cb){ 9K~2!<
if(cb!=null){ SV16]Vc
list.add(cb); =8$//$
} Kdk0#+xtP
} 1eQ9(hzF
} ~C=I{qzF+
TSqfl/UI
CountControl.java D_
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/* G\G TS}u[
* CountThread.java >k,|N4(
* J]/TxUE
* Created on 2007年1月1日, 下午4:57 5=tvB,Ux4
* 3^
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* To change this template, choose Tools | Options and locate the template under Vrn. #d
* the Source Creation and Management node. Right-click the template and choose qPZ'n=+
* Open. You can then make changes to the template in the Source Editor. W)3?T&`
*/ [2#5;')
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package com.tot.count; D-e0q)RSU
import tot.db.DBUtils; G%w.Z< qy
import java.sql.*; 6M9t<DQV
/** k\$))<3
* ,d n9tY3
* @author '_,/N!-V
*/ O,R5csMh
public class CountControl{ R>SS\YC'X
private static long lastExecuteTime=0;//上次更新时间 t!RR5!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 C( 8i0(1
/** Creates a new instance of CountThread */ W[BZ/
public CountControl() {} )=l~XV
public synchronized void executeUpdate(){ jY%&G#4
Connection conn=null; 6nh!g
PreparedStatement ps=null; ;q]Jm
try{ dfY(5Wc+f
conn = DBUtils.getConnection(); GL$!JKWp
conn.setAutoCommit(false); 0X@!i3eu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); b/'{6zn
for(int i=0;i<CountCache.list.size();i++){ WZO8|hY
CountBean cb=(CountBean)CountCache.list.getFirst(); q`z/ S>
CountCache.list.removeFirst(); "*W:
ps.setInt(1, cb.getCountId()); 2^w3xL"
ps.executeUpdate();⑴ r!SMF]?SJ
//ps.addBatch();⑵ ^Gt&c_gH
} 2g~qVT,
//int [] counts = ps.executeBatch();⑶ RUqN,C,m5I
conn.commit(); i'9aQi"G
}catch(Exception e){ XWN
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e.printStackTrace(); <WFA3
} finally{ VZo[\sWf
try{ ,Oa-AF/p
if(ps!=null) { Ix@rn
ps.clearParameters(); /5Aum?~
ps.close(); r(;oDdVc
ps=null; +\g/KbV7
} jGpSECs
}catch(SQLException e){} C(zgBk
DBUtils.closeConnection(conn); |f), dC
} Q ^X
} -F=?M+9[
public long getLast(){ VuA7rIF$66
return lastExecuteTime; k7JE{(Ok
} WLl_;BgN
public void run(){ m ;-FP 2~
long now = System.currentTimeMillis(); r09gB#K4
if ((now - lastExecuteTime) > executeSep) { 873$EiyXR
//System.out.print("lastExecuteTime:"+lastExecuteTime); zQ3m@x
//System.out.print(" now:"+now+"\n"); +GCN63nX
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {hQ0=rv<
lastExecuteTime=now; S:)Aj6>6
executeUpdate(); ]D?//
} ta"uxL\gge
else{ G165grGFd
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ~hK7(K
} F.5'5%
} ]v^/c~"${
} 9A_{*E(wd
//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 S3#NGBZ/
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