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: K%S k{'
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CountBean.java x;ujR<
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/* 2Ddrxc>48
* CountData.java J6jrtLh
* X_XqT
* Created on 2007年1月1日, 下午4:44 #bnFR
* REw!@Y."
* To change this template, choose Tools | Options and locate the template under tvI~?\Ylj
* the Source Creation and Management node. Right-click the template and choose 2+0'vIw}
* Open. You can then make changes to the template in the Source Editor. 4%B${zP(.}
*/ gCd9"n-e
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package com.tot.count; t0/fF'GZD
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/** "xw2@jGpG
* dq[CT
* @author N1_nBQF )
*/ ^/c&Ud
public class CountBean { MSw/_{
private String countType; 0LxA+
int countId; *&LVn)@[`
/** Creates a new instance of CountData */ Up`zVN59.
public CountBean() {} (ZDRjBth[
public void setCountType(String countTypes){ xZBmQ:s',S
this.countType=countTypes; PZQ}G*p3
} ceAK;v
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public void setCountId(int countIds){ lv,<[Hw1
this.countId=countIds; <jfi"SJu
} u"tv6Qp
public String getCountType(){ A2]N :=
return countType; |Zz3X
} .I[uXd
public int getCountId(){ r%F{1.
return countId; 'H:lR1(,
} Rom|Bqo;
} BB9Z?}
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CountCache.java B2VUH..am
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/* tFXG4+$D
* CountCache.java A:>G: X5t
* jPhOk>m
* Created on 2007年1月1日, 下午5:01 SI U"cO4
* Wk`G+VR+
* To change this template, choose Tools | Options and locate the template under }wz )"
* the Source Creation and Management node. Right-click the template and choose zS]Yd9;X1
* Open. You can then make changes to the template in the Source Editor. _<&IpT{w+
*/ KD=T04v
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package com.tot.count; az\;D\\
import java.util.*; V\^?V|
/** Jt@7y"<
* gQ h;4v
* @author p\~ lPXK
*/ (:-=XR9A`
public class CountCache { OP{ d(~+
public static LinkedList list=new LinkedList(); IYb@@Jzo
/** Creates a new instance of CountCache */ xqX~nV#TB
public CountCache() {} }>fL{};Z"
public static void add(CountBean cb){ 2 ES .)pQ
if(cb!=null){ -TSn_XE
list.add(cb); 1P@&xcvS\
} J8~3LE
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} f?[IwA`
} b2duC
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CountControl.java >DpnIWn
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/* "EDn;l-Q
* CountThread.java p~En~?<
* oe# :EfT
* Created on 2007年1月1日, 下午4:57 8 }nA8 J
* b>Iqk
* To change this template, choose Tools | Options and locate the template under fo^M`a!va0
* the Source Creation and Management node. Right-click the template and choose _z#zF[%
* Open. You can then make changes to the template in the Source Editor. esWgYAc3{
*/ ySL 31%
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package com.tot.count; 8it|yK.G@&
import tot.db.DBUtils; bw ' yX
import java.sql.*; xLP yV&j-
/** 4L(axjMYU
* O\-cLI<h2
* @author 48Z{wV,
*/ W1i Kn
public class CountControl{ fOF02WP^
private static long lastExecuteTime=0;//上次更新时间 SzMh}xDh2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 H@.j@l
/** Creates a new instance of CountThread */ A !x"*
public CountControl() {} ym{?vY
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public synchronized void executeUpdate(){ .YKQ6
Connection conn=null; z
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PreparedStatement ps=null; @_YlHe&W
try{ y!h$Z6.
conn = DBUtils.getConnection(); g< M\zD
conn.setAutoCommit(false); OIe {Sx{y
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )UO:J7K
for(int i=0;i<CountCache.list.size();i++){ ==l p\
CountBean cb=(CountBean)CountCache.list.getFirst(); OXK?R\ E+
CountCache.list.removeFirst(); ubju uha"
ps.setInt(1, cb.getCountId()); ~ucOQVmz@
ps.executeUpdate();⑴ ?TLMoqmXM{
//ps.addBatch();⑵ dyC: Mko=
} 3 8m5&5)1F
//int [] counts = ps.executeBatch();⑶ Y, )'0O
conn.commit(); nxA Y]Q
}catch(Exception e){ Z;P[)q
e.printStackTrace(); b,cA mZ
} finally{ 'RC(ss1G
try{ =;9Wh!{
if(ps!=null) { ?sfA/9"
ps.clearParameters(); Nc,"wA
ps.close(); D: NBb!
ps=null; MLG%+@\
} "[q/2vC
}catch(SQLException e){} FAz shR
DBUtils.closeConnection(conn); z
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} DyD#4J)E
} E;fYL]j/oZ
public long getLast(){ bW7tJ
return lastExecuteTime; v[q2OWcL
} ICN>8|O`&
public void run(){ ?54=TA|5`F
long now = System.currentTimeMillis(); s*>s;S?{|
if ((now - lastExecuteTime) > executeSep) { !;x
//System.out.print("lastExecuteTime:"+lastExecuteTime); T2AyQ~5~
//System.out.print(" now:"+now+"\n"); $pyM<:*L&<
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); P>+{}c}3I
lastExecuteTime=now; /QZnN?k
executeUpdate(); 3?|Fn8dQR.
} ]8NNxaE3 (
else{ !k)}p_e
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); rp6Y&3p.
} >JkQU e
} ;e_dk4_
} vRpMZ)e
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 vQ#$.*Cvn
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类写好了,下面是在JSP中如下调用。 !h4S`2oZ/
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<% &cV$8*2b^
CountBean cb=new CountBean(); VLQDktj&
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); y)X;g:w
CountCache.add(cb); 7[rn
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out.print(CountCache.list.size()+"<br>"); UeIu
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CountControl c=new CountControl(); 17I{_C
c.run(); @Y 1iEL%\y
out.print(CountCache.list.size()+"<br>"); R
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