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: qC@Ar)T
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CountBean.java i:Y\`J
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/* 9y^/GwUQ
* CountData.java 6E|S
* *)> do
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* Created on 2007年1月1日, 下午4:44 o| D^`Z
* <I2z&
* To change this template, choose Tools | Options and locate the template under <>=mCZ2
* the Source Creation and Management node. Right-click the template and choose ]V<-J
* Open. You can then make changes to the template in the Source Editor. {/}^D-
*/ 'RTtE
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package com.tot.count; ;h~er6&
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/** +a$|Sc
* X:=c5*0e
* @author 2o5;Uz1{
*/ }1 QF+Cf
public class CountBean { ;7rv
private String countType; 6G_<2bO
int countId; u7=T(4a
/** Creates a new instance of CountData */ YaL]>.;Z:"
public CountBean() {} k+1gQru{d
public void setCountType(String countTypes){ t;47(U
this.countType=countTypes; #C*&R>IvY
} ]ii+S"U3
public void setCountId(int countIds){ u) *Kws
this.countId=countIds; WRpyr
} .y): Rh^
public String getCountType(){ AK2WN#u@Z
return countType; n29(!10Px
} ddDS=OfH
public int getCountId(){ lS9n@
return countId; NK/4OAt%
} wss?|XCI
} SUE
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CountCache.java 4|Ui?.4=
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/* Ty+I8e]{
* CountCache.java )`?%]D
* V3.t;.@
* Created on 2007年1月1日, 下午5:01 zxKCVRJ
*
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* To change this template, choose Tools | Options and locate the template under LM.`cb;?G
* the Source Creation and Management node. Right-click the template and choose Zdn!qyR`
* Open. You can then make changes to the template in the Source Editor. h-mTj3p-K
*/ ai^|N.!
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package com.tot.count; W`L!N&fB
import java.util.*; l\Xd.H" j,
/** ycX{NDGs
* ngyY
* @author %l$W*.j|;
*/ 91d },Mq:
public class CountCache { Ceg!w#8 Z,
public static LinkedList list=new LinkedList(); "s_Z&
/** Creates a new instance of CountCache */ kGHC]Fb)
public CountCache() {} C-SLjJw
public static void add(CountBean cb){ 5
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if(cb!=null){ wk[
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list.add(cb); :&yDqoQKJ
} c K <)$*
} P))^vUt~
} FFzH!=7T?
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CountControl.java w~+ aW(2
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/* M{KW@7j
* CountThread.java )bDnbO$s_
* r@$ w*%
* Created on 2007年1月1日, 下午4:57 ~F[L4y!sL
* ][:rLs
* To change this template, choose Tools | Options and locate the template under ZkWL_ H)
* the Source Creation and Management node. Right-click the template and choose 0I%: BT
* Open. You can then make changes to the template in the Source Editor. `ROG~0lN(
*/ <avQR9'&
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package com.tot.count; NFyMY#\]
import tot.db.DBUtils; >K:u?YD[
import java.sql.*; F
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/** !% S4n
* $>w/Cy
* @author !j^&gRH
*/ RKuqx:U
public class CountControl{ {o|k.zy
private static long lastExecuteTime=0;//上次更新时间 f/ahwz
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 |wp,f%WK
/** Creates a new instance of CountThread */ e!X(yJI[O6
public CountControl() {} *g$i5!yM'
public synchronized void executeUpdate(){ :uK
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Connection conn=null; d3^7ag%
PreparedStatement ps=null; Y(VO.fVJK
try{ .eF_cD7v
conn = DBUtils.getConnection(); S/gm.?$V
conn.setAutoCommit(false); E*CcV;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ]U_ec*a
for(int i=0;i<CountCache.list.size();i++){ TFH&(_b
CountBean cb=(CountBean)CountCache.list.getFirst(); 4gZ&^y'
CountCache.list.removeFirst(); <z0WLw0'z
ps.setInt(1, cb.getCountId()); 5%i:4sMx
*
ps.executeUpdate();⑴ AW8'RfC.
//ps.addBatch();⑵ Oh; Jw
} <kc#thL
//int [] counts = ps.executeBatch();⑶ I/uy>*
conn.commit(); 4Z5#F]OA7
}catch(Exception e){ HEY4$Lf(I
e.printStackTrace(); @x{`\AM|%
} finally{ dULS^i@@
try{ q|dH~BK
if(ps!=null) { %SA!p;
ps.clearParameters(); 9- )qZ
ps.close(); @*O?6>
ps=null; 6"QEJ
} j1U 5~%^
}catch(SQLException e){} PCE4W^ns
DBUtils.closeConnection(conn); *e{PxaF!C
} LU2waq}VA
} 0(\+-<
public long getLast(){ 97`WMs
return lastExecuteTime; JUt7En;XE
} }iww:H-1
public void run(){ Mi0sC24b|
long now = System.currentTimeMillis(); AEg(m<t
if ((now - lastExecuteTime) > executeSep) { SvuTc!$?
//System.out.print("lastExecuteTime:"+lastExecuteTime); 63&^BW
//System.out.print(" now:"+now+"\n"); H lB]38
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); MXZ>"G
lastExecuteTime=now; Xs$Ufi
executeUpdate(); j8$Zv%Ca%
} @;^Y7po6u
else{ ^&