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: E[Ws} n.
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CountBean.java j+B5m:ExfI
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/* 6`5
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* CountData.java #ZnX6=;X
* `Py=
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* Created on 2007年1月1日, 下午4:44 3_eml\CY
* ?o(X0
* To change this template, choose Tools | Options and locate the template under b\Xu1>
* the Source Creation and Management node. Right-click the template and choose +_XbHjhN/
* Open. You can then make changes to the template in the Source Editor. V8U`%/`N
*/ A*;^F]~'
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package com.tot.count; [?f.0q
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/** Q}f}Jf3P
* N5an9r&z(1
* @author (7jB_ p%
*/ $I6eHjYT
public class CountBean { kcz#8K]~
private String countType; i6 ypx
int countId;
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/** Creates a new instance of CountData */ |KrG3-i3X
public CountBean() {} .8PO7#
public void setCountType(String countTypes){ ,vdP
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this.countType=countTypes; s$\8)V52
} q~dg
public void setCountId(int countIds){ @G$<6CG\
this.countId=countIds; cxJK>%84
} .s*EV!SE
public String getCountType(){ ?kFCYZK|"
return countType; +=H>s;B
} T[[
public int getCountId(){ E+c3KqM
return countId; z&vms
} Qu>zO !x
} rn5g+%jX*
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CountCache.java ]XafFr6pe
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/* -r'seb5
* CountCache.java ~S_IU">E
* (cA|N0
* Created on 2007年1月1日, 下午5:01 L(n~@gq
* Jx>B %vZ\
* To change this template, choose Tools | Options and locate the template under pD6g+Taj
* the Source Creation and Management node. Right-click the template and choose m^x\@!N:(
* Open. You can then make changes to the template in the Source Editor. q.b4m 'J
*/ PXu<4VF
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package com.tot.count; pfQZ|*>lkb
import java.util.*; *|#JFy?c[
/** tc2GI6]e'
* /Vd#q)b%T
* @author 1Da [!^u,D
*/ _xL&sy09t
public class CountCache { z*~PYAt
public static LinkedList list=new LinkedList(); m"7 R
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/** Creates a new instance of CountCache */ Y6%OV?}v!
public CountCache() {} @
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public static void add(CountBean cb){ H_=[~mJ
if(cb!=null){ NEou2y+}
list.add(cb); qVe6RpS
} 4NR5?s
} Lz{T8yvZ
} 2&K|~~
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CountControl.java k8wi-z[dV
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/* ts\>_/
* CountThread.java S,9WMti4x
* 14YV#o:
* Created on 2007年1月1日, 下午4:57 -x\l<\*
* [*ovYpj^
* To change this template, choose Tools | Options and locate the template under V//q$/&8(
* the Source Creation and Management node. Right-click the template and choose j~f 7WJ
* Open. You can then make changes to the template in the Source Editor. `"mK\M
*/ %c/"A8{ eb
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package com.tot.count; rkc%S5we
import tot.db.DBUtils; 54cgX)E[x
import java.sql.*; sH,)e'0
/** {ZEXlNPww
* V+~{a:8[pq
* @author iwjl--)@K
*/ 5qfKV&D
public class CountControl{ 9l_?n@
private static long lastExecuteTime=0;//上次更新时间 (C|V-}/*m
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ?F!J@Xn5
/** Creates a new instance of CountThread */ t}+c/ C%b=
public CountControl() {} oqHm:u^2
public synchronized void executeUpdate(){ M &EJFpc*
Connection conn=null; HF[%/Tu
PreparedStatement ps=null; "57G@NC{n
try{ n >PM_W
conn = DBUtils.getConnection(); poFjhq
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conn.setAutoCommit(false); PxD}j
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Zw
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for(int i=0;i<CountCache.list.size();i++){ X&oy.Roo
CountBean cb=(CountBean)CountCache.list.getFirst(); -vfu0XI~
CountCache.list.removeFirst(); f_2^PF>?
ps.setInt(1, cb.getCountId()); 5nqdY*
ps.executeUpdate();⑴ PlRs-% d
//ps.addBatch();⑵ Sz@?%PnU|
} 2#M:JgWV
//int [] counts = ps.executeBatch();⑶ a(T4WDl^
conn.commit(); }M@Jrq+7
}catch(Exception e){ HwMsP$`q
e.printStackTrace(); }4]x"DfIg
} finally{ 'wV26Dm
try{ V="f)'S$
if(ps!=null) { *LdH/C.LIf
ps.clearParameters(); \#7%%>p=O'
ps.close(); pytfsVM
ps=null; TFNU+
} MJpTr5Vs
}catch(SQLException e){} ,,wx197XeD
DBUtils.closeConnection(conn); c;}n=7,>:L
} `|?$; )
} @7 HBXP
public long getLast(){ \JC(pn
return lastExecuteTime; zn$Ld,
} Jiylrf`o
public void run(){ 1Klu]J%
long now = System.currentTimeMillis(); ~6i mkv^ F
if ((now - lastExecuteTime) > executeSep) { L>GYj6D9
//System.out.print("lastExecuteTime:"+lastExecuteTime); O[B_7
//System.out.print(" now:"+now+"\n"); <!XnUCtV
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); luog_;{h+
lastExecuteTime=now; bO3KaOC8N
executeUpdate(); zb,`K*Z{
} q[A3$y(
else{ Jn&>Z? @
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); e;r-}U
} D|3QLG
} CGl+!t{
} irj}:f;!eF
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 3edK$B51;
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类写好了,下面是在JSP中如下调用。 ZaindX{.1
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<% LOkDx2@g
CountBean cb=new CountBean(); LgKEg90w(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); )X$n'E
CountCache.add(cb); =DwH*U/YR
out.print(CountCache.list.size()+"<br>"); o;C)!
CountControl c=new CountControl(); Qnh1su5
c.run(); HV(*6b@
out.print(CountCache.list.size()+"<br>"); cNCBbOMr
%>