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: `bi
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CountBean.java DMRs}Yz6
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/* uyvs kz\
* CountData.java ;9Hz{ej
* ^zkd{ov
* Created on 2007年1月1日, 下午4:44 3?]S,~!F
* I@c0N*(
* To change this template, choose Tools | Options and locate the template under X[Y#+z4
* the Source Creation and Management node. Right-click the template and choose `ITDTZ
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* Open. You can then make changes to the template in the Source Editor. }K+\8em
*/ ~JT lPU'
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package com.tot.count; _qk9o
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/** /.f!
* Zm5nLxM
* @author ]#+5)[N$>
*/ <6gU2@1
public class CountBean { M`q#,Y?3^I
private String countType; J~:kuf21
int countId; 2%*|fF}I
/** Creates a new instance of CountData */ 'fXer!L}
public CountBean() {} CVi<~7Am\
public void setCountType(String countTypes){ jeyaT^F(
this.countType=countTypes; )
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} 8g&uE*7N
public void setCountId(int countIds){ KS8\F0q
this.countId=countIds; _GRv
} 7?*~oVZW
public String getCountType(){ %9cqJ]S
return countType; r]xdhR5
} s'_$j$1
public int getCountId(){ _6|
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return countId; s-y'<(ll
} z, :+Oc
} I(F1S,7
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CountCache.java QZ_nQ3K
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/* ,[+ZjAyG}#
* CountCache.java 9?v)
* \q|e8k4p
* Created on 2007年1月1日, 下午5:01 p3i
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* ;o&_:]S
* To change this template, choose Tools | Options and locate the template under 6eVe}V4W
* the Source Creation and Management node. Right-click the template and choose r(748Qc4f?
* Open. You can then make changes to the template in the Source Editor. ,2Sv1v$
*/ 7ZrJ#n8?ih
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package com.tot.count; <$Xn:B<H
import java.util.*; i,\t]EJAU
/** >!CH7wX
* mOgx&ns;j
* @author >0[qi1
*/ &L2`L)
public class CountCache { +G>aj'\M|
public static LinkedList list=new LinkedList(); v#zfs'
/** Creates a new instance of CountCache */ p=je"{
public CountCache() {} 47$-5k30
public static void add(CountBean cb){ w4>:uyE
if(cb!=null){ uBV^nUjS"m
list.add(cb); im_0ur&'
} -uS7~Ww.a
} ZzwZ,(
} 9~*_(yjF
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CountControl.java $Ykp8u,(
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/* xX[{E x
* CountThread.java LKoM\g(
* K'ed5J
* Created on 2007年1月1日, 下午4:57 u^;sx/
* "y3dwSS
* To change this template, choose Tools | Options and locate the template under P<g|y4h
* the Source Creation and Management node. Right-click the template and choose _~(MA-l
* Open. You can then make changes to the template in the Source Editor. \3
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*/ y^vfgP<@
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package com.tot.count; $]`'Mi
import tot.db.DBUtils; 6-Vl#Lyb
import java.sql.*; Ra*k
/** INeWi= 1
* %u<&^8EL+#
* @author AX^3uRQJ
*/ xf{C'uF/
public class CountControl{ 'R-JQE-]
private static long lastExecuteTime=0;//上次更新时间 #m[w=Pu}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ?Ix'2v
/** Creates a new instance of CountThread */ "Hsq<oV8
public CountControl() {} +;4AG::GN
public synchronized void executeUpdate(){ 'bQs_
Connection conn=null; @/Wty@PU
PreparedStatement ps=null; -6*OF.Ag`
try{ lu9Ir>c
conn = DBUtils.getConnection(); $rV:&A
conn.setAutoCommit(false); {&Gk.ODI7
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); MWp\D#H
for(int i=0;i<CountCache.list.size();i++){ *U5>j#,
CountBean cb=(CountBean)CountCache.list.getFirst(); p3'mJ3MA
CountCache.list.removeFirst(); *]DJAF]
ps.setInt(1, cb.getCountId()); XJV3oj
ps.executeUpdate();⑴ 2Q;Y@%G
//ps.addBatch();⑵ HtS1N}@
} rVIb'sa
//int [] counts = ps.executeBatch();⑶ /s-jR]#VA
conn.commit(); cnjj)
c
}catch(Exception e){ t8wz'[z
e.printStackTrace(); -;DE&~p
} finally{ oVxV,oH(
try{ tkUW)ScJ
if(ps!=null) { y}H*p
ps.clearParameters(); Y+Q,4s
ps.close(); ~,3v<A[5Vi
ps=null; +{ ,w#@
} IQIb\OUo!v
}catch(SQLException e){}
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DBUtils.closeConnection(conn); vVvt
]h
} |]
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} JJZXSBAOU
public long getLast(){ ;zxlwdfcr'
return lastExecuteTime; E.G h@i
} eG2qOq$[
public void run(){ >8{`q!=|~
long now = System.currentTimeMillis(); XiZ Zo
if ((now - lastExecuteTime) > executeSep) { 2+G:04eS,e
//System.out.print("lastExecuteTime:"+lastExecuteTime); He$mu=$q{
//System.out.print(" now:"+now+"\n"); R'a5,zEo/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); F.* snF
lastExecuteTime=now; (J) Rs`_
executeUpdate(); ezNE9g
} ,:Ix s^-
else{ Cg%I)nz
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); PtVNG
} t+TbCe
} )Q pP1[
} :Y)kKq d
//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 =Q8^@i4[&D
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类写好了,下面是在JSP中如下调用。 ?p/kuv{\o#
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<% [HZCnO|N
CountBean cb=new CountBean(); ch2e#Jf8
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (nP*
CountCache.add(cb); J\8l%4q3
out.print(CountCache.list.size()+"<br>"); N<i Vs
CountControl c=new CountControl(); VRN9 yn2
c.run(); /dP8F
out.print(CountCache.list.size()+"<br>"); |LGNoP}SA
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