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: JWL J<z
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CountBean.java o}A #-
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/* HqBPY[;s
* CountData.java o3qv945
* D3xaR
* Created on 2007年1月1日, 下午4:44 j!\0Fyr
* YkPt*?,P/
* To change this template, choose Tools | Options and locate the template under dO,05?q|
* the Source Creation and Management node. Right-click the template and choose E+zn\v
* Open. You can then make changes to the template in the Source Editor. fJ2{w[ne
*/ z-5#bOABW
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package com.tot.count; GuWBl$|+b
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/** PEEY;x
* bOMP8{H,
* @author "S`wwl
*/ ZPao*2xz
public class CountBean { _KVB~loT
private String countType; I;-5]/,
int countId; 9`xFZMd31A
/** Creates a new instance of CountData */ ~iZF~PQ1_
public CountBean() {} HDyZzjgG
public void setCountType(String countTypes){ QV$dKjMS
this.countType=countTypes; Vor9
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} "NH+qQhs
public void setCountId(int countIds){ 7RE6y(V1
this.countId=countIds; PV6*-[
} vw]
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public String getCountType(){ 2bnIT>(
return countType; X#,[2&17Fh
} hX%v`8
public int getCountId(){ T zYgH
return countId; 43=-pyp
} ?]D+H%3[$i
} y%bqeo
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CountCache.java b^DV9mO4J
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/* }#>d2 =T$
* CountCache.java x[W]?`W3r~
* y~c[sW
* Created on 2007年1月1日, 下午5:01 ptyDv
* up3<=u{>
* To change this template, choose Tools | Options and locate the template under 1r&
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* the Source Creation and Management node. Right-click the template and choose C$G88hesn
* Open. You can then make changes to the template in the Source Editor. Q
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*/ YCBML!L
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package com.tot.count; RK:sQWG
import java.util.*; /{MH'
/** y'|W['
* e=;@L3f
* @author @-@rG>y^:
*/ h;UdwmT
public class CountCache { gc7:Rb^E5t
public static LinkedList list=new LinkedList(); #'Y6UGJ\n
/** Creates a new instance of CountCache */ n;^k
public CountCache() {} O\F^@;]F6
public static void add(CountBean cb){ 0*IY%=i
if(cb!=null){ ajW$d!
list.add(cb); i^ cM@?
} i-s?"Fk
} W<N QUf[=
} 'A(-MTd%
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CountControl.java rn[}{1I33Q
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/* `)!2E6 =
* CountThread.java +6)kX4
* 9
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* Created on 2007年1月1日, 下午4:57 j X!ftm2
* UFAMbI
* To change this template, choose Tools | Options and locate the template under hPi
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* the Source Creation and Management node. Right-click the template and choose P}WhE
* Open. You can then make changes to the template in the Source Editor. X`v79`g_
*/ _KhEwd
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**$
package com.tot.count; CE7pg&dJ)i
import tot.db.DBUtils; 5A]LNA4i
import java.sql.*; `MYK XBM
/** `Y({#U
* OK2/k_jXN'
* @author L5qCv -{
*/ ]V769B9
public class CountControl{ - Zoo)
private static long lastExecuteTime=0;//上次更新时间 ocA'goI-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 OG?j6qhpl
/** Creates a new instance of CountThread */ 031.u<_
public CountControl() {} O$umu_
public synchronized void executeUpdate(){ i_'R"ob{S
Connection conn=null; c>WpO Z,
PreparedStatement ps=null; UFIAgNKl
try{ Up/u|A$0V
conn = DBUtils.getConnection(); >5~Zr$
conn.setAutoCommit(false); W
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 6[3Ioh
for(int i=0;i<CountCache.list.size();i++){ 6v2RS
CountBean cb=(CountBean)CountCache.list.getFirst(); Jyz$&jqyr'
CountCache.list.removeFirst(); ~SR(K{nf#.
ps.setInt(1, cb.getCountId()); SL\y\GaV
ps.executeUpdate();⑴ q%kj[ZOY$]
//ps.addBatch();⑵ "J[i=~(
} WVT5VJ7*
//int [] counts = ps.executeBatch();⑶ sg6w7fp>
conn.commit(); @F(3*5c_Y
}catch(Exception e){ q{De&Bu
e.printStackTrace(); j#nO6\&o
} finally{ (|a$N.e&K
try{ ?<yq 2`\4O
if(ps!=null) { hNq8
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ps.clearParameters(); y%IG:kZ,
ps.close(); ;/)Mcx] n
ps=null; \BbOljM=
} hDD~,/yVxs
}catch(SQLException e){} ++Ys9Y)*,
DBUtils.closeConnection(conn); 6Er0o{iI
} spSN6.j
} 1y)$[e
public long getLast(){ eA*Jfb
return lastExecuteTime; v-7Rb)EP
} rz[uuY7
public void run(){ gGI#QPT`X
long now = System.currentTimeMillis(); ]2xx+P#Y
if ((now - lastExecuteTime) > executeSep) { bDh:!M
//System.out.print("lastExecuteTime:"+lastExecuteTime); sx-Hw4.a"
//System.out.print(" now:"+now+"\n"); I"F
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ><#2O
lastExecuteTime=now; mS)|6=Y
executeUpdate(); vzohq1r5
} &`
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else{ =_?pOq
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |B1;l<|`
} hk5E=t~&
} O'!r]0Q
} "3Xv%U9@
//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 <