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: >.9eBz@
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CountBean.java JXQPT
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/* -mNQ;zI1
* CountData.java IY(h~O
* `{<frB@
* Created on 2007年1月1日, 下午4:44 pck >;V
* =fLL|
* To change this template, choose Tools | Options and locate the template under #mc!Wt10
* the Source Creation and Management node. Right-click the template and choose %n$^-Vc&
* Open. You can then make changes to the template in the Source Editor. {gF0Xm%
*/ <dR,'
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package com.tot.count; [5ethM
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/** =Z0t :{
* ,cHU) j
* @author 'UwI*EW2S
*/ GKtS6$1d#
public class CountBean { x/TGp?\g
private String countType; z MdC
int countId; Rph%*~'
/** Creates a new instance of CountData */ 2=*=^)FNI
public CountBean() {} y).P=z
public void setCountType(String countTypes){ V2znU
this.countType=countTypes; Rq)BssdF
} R"xp%:li
public void setCountId(int countIds){ H3FW52pjX
this.countId=countIds; Z[#IfbYt
} Ueyw;Y
public String getCountType(){ 83;IyvbL
return countType; )qM|3],
} [,f)9v)
public int getCountId(){ |"k&fkS$
return countId; I@Z)<5Zf
} 1$LI px
} <!x+eE`
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CountCache.java tB6k|cPC
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/* `| 9K u
* CountCache.java $C_M&O}
* PnWD}'0V
* Created on 2007年1月1日, 下午5:01 3;/?q
*
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* To change this template, choose Tools | Options and locate the template under \2DE==M)P
* the Source Creation and Management node. Right-click the template and choose }C6@c1myq-
* Open. You can then make changes to the template in the Source Editor. Q7Ij4
*/ c?6d2jH.
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package com.tot.count; L7q | ^`
import java.util.*; }5gr5g\OtP
/** _vrWj<wyf
* mvTb~)
* @author YdOUv|tZC
*/ P#tvm,
public class CountCache { tHI*,
public static LinkedList list=new LinkedList(); zXre~b03ZS
/** Creates a new instance of CountCache */ =HE
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public CountCache() {} %?tq;~|]Q
public static void add(CountBean cb){ Z;<ep@gy~
if(cb!=null){ U</+ .$b
list.add(cb); &hN,xpC
} (([I]q
} P^IY:
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} %g^"]
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CountControl.java Yo2Trh
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/* ~775soN
* CountThread.java J?jeYW
* :R+],m il
* Created on 2007年1月1日, 下午4:57 \C/z%Hf7-
* k&GHu0z
* To change this template, choose Tools | Options and locate the template under a!t
V6H
* the Source Creation and Management node. Right-click the template and choose *T4ge|zUc
* Open. You can then make changes to the template in the Source Editor. ,P@QxnQ
*/ ?0J0Ij,
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package com.tot.count; Ak=UtDN[
import tot.db.DBUtils; k>{-[X,/OV
import java.sql.*; Z=9dMND
/** .cR*P<3O
* 60PYCqWc
* @author BX$hAQ(6Q
*/ `Cj,HI_/*
public class CountControl{ ryEvmWYu
private static long lastExecuteTime=0;//上次更新时间 t<lyg0f
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5Rs?CVVb
/** Creates a new instance of CountThread */ r<(kLpOH%
public CountControl() {} E^syrEz
public synchronized void executeUpdate(){ Ekf2NT
Connection conn=null; ;D&wh
PreparedStatement ps=null; M[,^KJ!
try{ 6Bdyf(t
conn = DBUtils.getConnection(); b\L)m (
conn.setAutoCommit(false); %HEmi;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); `@$YlFOW
for(int i=0;i<CountCache.list.size();i++){ Ihef$,
CountBean cb=(CountBean)CountCache.list.getFirst(); +{ab1))/
CountCache.list.removeFirst(); lIl9ypikg
ps.setInt(1, cb.getCountId()); 7.|S>+Q
ps.executeUpdate();⑴ `Kp}s<
//ps.addBatch();⑵ s5.k|!K
} Wf1-"Q
//int [] counts = ps.executeBatch();⑶ -s~p}CQ.
conn.commit(); '%Dg{ zL
}catch(Exception e){ ZOHRUm
e.printStackTrace(); yS"0/Rm}
} finally{ '%O\E{h
try{ &
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if(ps!=null) { !:J<pWN"
ps.clearParameters(); qS82/e)7
ps.close(); s=j O;K$
ps=null; }2xb&6g~o
} +-k`x0v
}catch(SQLException e){} /O"0L/hc^
DBUtils.closeConnection(conn); gT7I9 (x!W
} }q x(z^
} JOHp?3 "4
public long getLast(){ Bcm=G""
return lastExecuteTime; %#Q
#N,fw
} nP)-Y#`~7
public void run(){ QQ|9>QP
long now = System.currentTimeMillis(); ;S=e%:zb
if ((now - lastExecuteTime) > executeSep) { A'v[SUW'm
//System.out.print("lastExecuteTime:"+lastExecuteTime); V,'FlU
//System.out.print(" now:"+now+"\n"); %>NRna
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ndt8=6p
lastExecuteTime=now; e)og4
executeUpdate(); % NwoU%q
} Ug`
else{ %J3lK]bv(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); A3!2"}L
} $YR{f[+L
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} oG9SO^v_
} D2-O7e
//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 <v-92?
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类写好了,下面是在JSP中如下调用。 6!o/~I#
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<% !j'guT&9]
CountBean cb=new CountBean(); m"1
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); otZ JY)
CountCache.add(cb); n%Rjt!9
out.print(CountCache.list.size()+"<br>"); <m9JXO:5
CountControl c=new CountControl(); M%77u=m
c.run(); ~M(pCSJ[
out.print(CountCache.list.size()+"<br>"); a\|X^%2g
%>