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: +6tj
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CountBean.java ?5(Cwy ?
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/* {%W'Zx
* CountData.java YCr:nYm<f
* 7 lc -
* Created on 2007年1月1日, 下午4:44 g,Z8I;A^
* IzPnbnS}
* To change this template, choose Tools | Options and locate the template under qyzmjV6J2
* the Source Creation and Management node. Right-click the template and choose d>[=]
* Open. You can then make changes to the template in the Source Editor. #!="b8F
*/ xwK{}==U
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package com.tot.count; .YYfba#{
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/** [?z`XY_-
* 6U|An*
* @author T%|{Qo<j
*/ IiW*'0H:/
public class CountBean { XS+2OutVo
private String countType; E Dh$UB)
int countId; y&;ytNG&<
/** Creates a new instance of CountData */ XFJGL!wWm[
public CountBean() {} SB"Uu2)wZ
public void setCountType(String countTypes){ @@->A9'L
this.countType=countTypes; fS9TDy
} `5da
public void setCountId(int countIds){ 4mYJ i#e6x
this.countId=countIds; 9 Z,K
} Fo\* Cr9D
public String getCountType(){ (55k70>i3
return countType; G)~/$EF,_
} 6! `^}4
public int getCountId(){ #Bu W
return countId; h=:Ls]ZU
} .d
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} o@T-kAEf-.
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CountCache.java 'x/pV5[hQ
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/* 7dxTyn=
* CountCache.java PydU.,^7
* ]J|]IPXy
* Created on 2007年1月1日, 下午5:01 G,o5JL"t
* JK.<(=y\
* To change this template, choose Tools | Options and locate the template under $W} YXLFj?
* the Source Creation and Management node. Right-click the template and choose BF)!VnJ
* Open. You can then make changes to the template in the Source Editor. VY9o}J>,w
*/ #Y|t,x;
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package com.tot.count; !q]@/<=
import java.util.*; /:S&1'=
/** 3`
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* AN)exU ?
* @author o'Rr2,lVi
*/ {N.JA=
public class CountCache { \3K%>
public static LinkedList list=new LinkedList(); *z?Vy<u G
/** Creates a new instance of CountCache */ V.\12P
public CountCache() {} y6#AL<W@=
public static void add(CountBean cb){ MgpjC`
if(cb!=null){ $c^,TAN
list.add(cb); Cpg>5N~;L
} `2
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} J_-K"T|f
} {KQ]"a 6
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CountControl.java P:8qmDXo
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/* {wK|C<K
* CountThread.java czG]rl\1
* *3R3C+
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* Created on 2007年1月1日, 下午4:57 OV>JmYe1{/
* ;*+wg5|
* To change this template, choose Tools | Options and locate the template under 5EX
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* the Source Creation and Management node. Right-click the template and choose 4CH/~b1(
* Open. You can then make changes to the template in the Source Editor. .:wo
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*/ W)~}o<a)[
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package com.tot.count; g.,_E4L
import tot.db.DBUtils; q0t}
import java.sql.*; eVRPjVzQ'Q
/** 9_Ws8nE
* ,SV34+(
* @author FTJvkcc?m
*/ UI]UxEJ
public class CountControl{ ?GT,Y5
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V'M#."Of/
/** Creates a new instance of CountThread */ *!5X!\e_
public CountControl() {} B'}pZOa[Wb
public synchronized void executeUpdate(){ xq@_'
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Connection conn=null; H*KZZTKd
PreparedStatement ps=null; W ])Lc3X
try{ JmBe1"hs
conn = DBUtils.getConnection(); ^.gBHZ
conn.setAutoCommit(false); :iEIo7B
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); R!z32 <5k
for(int i=0;i<CountCache.list.size();i++){ bnzIDsw!Q
CountBean cb=(CountBean)CountCache.list.getFirst(); !,Uzt1K:
CountCache.list.removeFirst(); v\ <4y P
ps.setInt(1, cb.getCountId()); k1_"}B5
ps.executeUpdate();⑴ N+nv#]{
//ps.addBatch();⑵ VRQD
} 2~B9 (|
//int [] counts = ps.executeBatch();⑶ VKb=)v[K
conn.commit(); ]1)#Y
}catch(Exception e){ )RCva3Ul
e.printStackTrace(); yM
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} finally{ zd0[f3~
try{ 38zG[c|X
if(ps!=null) { /w/um>>K.
ps.clearParameters(); GNX`~%3KYc
ps.close(); -qs
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ps=null; ?#0m[k&`
} 0J z|BE3Y
}catch(SQLException e){} GOU>j"5}2
DBUtils.closeConnection(conn); 5sZqX.XVF
} X%R )
} U$m[{r2M
public long getLast(){ {8e4TD9E0
return lastExecuteTime; :pw6#yi8`
} /r?EY&9G
public void run(){ A$1Gc>C
long now = System.currentTimeMillis(); WB|N)3-1
if ((now - lastExecuteTime) > executeSep) { @.8FVF
//System.out.print("lastExecuteTime:"+lastExecuteTime); `gE_u
//System.out.print(" now:"+now+"\n"); kP[LS1}*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); _xu_W;nh
lastExecuteTime=now; FCIA8^}s
executeUpdate(); N / Fa^[
} cMZ-
else{ aS/ MlMf
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 8S#TOeQ
} S%IhpTSe6
} VlFhfOR6t
} s$ZKd
//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 p/ au.mc
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类写好了,下面是在JSP中如下调用。 kJNu2S
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<% 5J2tR6u-(
CountBean cb=new CountBean(); fqm-?vy}
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); *5z"Xy3J
CountCache.add(cb); K06x7W
out.print(CountCache.list.size()+"<br>"); As+^6
CountControl c=new CountControl(); @p[ml m
c.run(); X*<
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out.print(CountCache.list.size()+"<br>"); i-M<_62c
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