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: 'p[B`Ft3F
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CountBean.java sFsf~|
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/* GH`y-Ul'K
* CountData.java "w__AYHV
* K@a#^lmd
* Created on 2007年1月1日, 下午4:44 SnM^T(gtS3
* -x|!?u5F
* To change this template, choose Tools | Options and locate the template under ^|2m&2
* the Source Creation and Management node. Right-click the template and choose i>dFpJ
* Open. You can then make changes to the template in the Source Editor. YWL7.Y>%5
*/ ?F*I2rt#
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package com.tot.count; QXgfjo
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/** > }kZXeR|
* Qraa0]56
* @author d qO]2d
*/ s-~`Ao'
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public class CountBean { -"?~By}<C
private String countType; "/ Gw`^t
int countId; ]EG8+K6
/** Creates a new instance of CountData */ <5}j(jxz}
public CountBean() {} .}:*tvot
public void setCountType(String countTypes){ xC}' "``s
this.countType=countTypes; Tr;.O?@{t}
} <2~DI0pp(
public void setCountId(int countIds){ ln8es{q
this.countId=countIds; ngI+afo
} ^dE[ ;
public String getCountType(){ *kcc]*6@s
return countType; O- LwX
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} 5".bM8o
public int getCountId(){ PWkSl
return countId; m_,Jbf
} |$~]|SK
} yB 'C9wEH
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CountCache.java u6| IKZ
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/* Kf_xKW)^
* CountCache.java 1GB]Yi[>
* .?LRt
* Created on 2007年1月1日, 下午5:01 *xY3F8
* >y(loMl
* To change this template, choose Tools | Options and locate the template under )d2:r 07a
* the Source Creation and Management node. Right-click the template and choose 0Ng?U+6
* Open. You can then make changes to the template in the Source Editor. CF@*ki3X
*/ 8si{|*;hL
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package com.tot.count; 0rm(i*Q
import java.util.*; nHRk2l|
/** Mc!LC
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* c27(en(
* @author b#R$P]dr=
*/ fNfa.0s
public class CountCache { 1&<o3)L:
public static LinkedList list=new LinkedList(); oe0YxSauL
/** Creates a new instance of CountCache */ nwC*w`4
public CountCache() {}
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public static void add(CountBean cb){ 96J]g*o(uU
if(cb!=null){ zmL
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list.add(cb); lyyf&?2
} dQ9W40g1
} -Dy<B
} " Up(Vj@
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CountControl.java pl)?4[`LUc
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/* |]k,0Y3v
* CountThread.java Aq$1#1J
* AE~@F4MK
* Created on 2007年1月1日, 下午4:57 /e^) *r
* mH4u@aQ}
* To change this template, choose Tools | Options and locate the template under DT)][V^w
* the Source Creation and Management node. Right-click the template and choose PAtv#)h
* Open. You can then make changes to the template in the Source Editor. lSO$Q]!9
*/ x(R;xB
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package com.tot.count; qswC>Gi
import tot.db.DBUtils; qu dY9_
import java.sql.*; 2FV@?x0po
/** kv, !"<
* `wU['{=
* @author ^cSfkBh
*/ qSG0TWD!pq
public class CountControl{ $`ptSR
private static long lastExecuteTime=0;//上次更新时间 0Q?%B6g$m[
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ZH8 w^}
/** Creates a new instance of CountThread */ (C"q-0?n
public CountControl() {} 8"g+
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public synchronized void executeUpdate(){ )b>misb/
Connection conn=null; " zD9R4\X.
PreparedStatement ps=null; B8n[ E
try{ G$&jP:2q
conn = DBUtils.getConnection(); _z{9V7n4
conn.setAutoCommit(false); ^Jq('@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "` cP V){]
for(int i=0;i<CountCache.list.size();i++){ !G0Mg; ,
CountBean cb=(CountBean)CountCache.list.getFirst(); ; '
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CountCache.list.removeFirst(); ID!S}D
ps.setInt(1, cb.getCountId()); vM5/KrW
ps.executeUpdate();⑴ 6
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//ps.addBatch();⑵ %6 GM[1__
} 3&AJN#c
//int [] counts = ps.executeBatch();⑶ yt="kZ
conn.commit(); qQG? k~r
}catch(Exception e){ 2;s[ m3
e.printStackTrace(); g<M!]0OK
} finally{ \4G9YK-N>
try{ l'wu-
if(ps!=null) { ~yw]<{ ?
ps.clearParameters(); HF_8661g
ps.close(); {z0iWY2Xw
ps=null; 0'$67pY
} q{f\_2[
}catch(SQLException e){} r~f;g9I
DBUtils.closeConnection(conn); su1fsoL0
} 2zh-ms
} K[OOI~"C
public long getLast(){ Bl8|`R^g
return lastExecuteTime; Ew|Z<(
} w)@Wug
public void run(){ HB'9&
long now = System.currentTimeMillis(); Q>Z~={"
if ((now - lastExecuteTime) > executeSep) { zb!1o0, J
//System.out.print("lastExecuteTime:"+lastExecuteTime); wS#Uw_[
//System.out.print(" now:"+now+"\n"); w(S~}'Sg*P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 2 (l0Lq*
lastExecuteTime=now; p!^K.P1 '
executeUpdate(); 37a1O>A
} l/zv >
else{ rM
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); >uq0}HB$a
}
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} ppvlU H5;
} Q*ELMib
//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 *9kg\#
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类写好了,下面是在JSP中如下调用。 ~i?A!
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<% b5^>QzgD
CountBean cb=new CountBean(); O(8CrKYY
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); np6G~0Y`
CountCache.add(cb); .Hqq!&
out.print(CountCache.list.size()+"<br>"); 8_HBcZWs
CountControl c=new CountControl(); qwj7CIc(
c.run(); (P-^ PNz&
out.print(CountCache.list.size()+"<br>"); ^$lZ
%>