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: vuw1ycy)
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CountBean.java [vV-0Lx"
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/* I`5MAvP
* CountData.java q{KRM\ooYs
* |wK)(s
* Created on 2007年1月1日, 下午4:44 gdkO|x
* bM;tQ38*
* To change this template, choose Tools | Options and locate the template under .l#Pmd!
* the Source Creation and Management node. Right-click the template and choose |mci-ZT
* Open. You can then make changes to the template in the Source Editor. R`s /^0
*/ QuF%m^aE
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package com.tot.count; O\G%rp L$w
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/**
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* tK8\Ib J
* @author FIG5]u
*/ kTFN.kQx@
public class CountBean { 3c-ve$8u~
private String countType; XtQ3$0{*%
int countId; z|pH>R?:
/** Creates a new instance of CountData */ u6 B (f;
public CountBean() {} fnB-?8K<
public void setCountType(String countTypes){ pCpj#+|_)
this.countType=countTypes; ^z)lEO
} V(w[`^I>~
public void setCountId(int countIds){ 1f}S:Z
this.countId=countIds; )03.6Pvs
} ,pAMQ5
public String getCountType(){ Qt@~y'O
return countType; qTffh{q V
} Y-9]J(
public int getCountId(){ J'B;
return countId; ]JhtO{
} U*6-Y%7
} 1noFXzeU3
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CountCache.java E]ZM`bex&
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/* }n:-nB4
* CountCache.java 0Fi7|
* t^h>~o'\
* Created on 2007年1月1日, 下午5:01 wv?`3:co
* ;M'R/JlUN
* To change this template, choose Tools | Options and locate the template under RmzK?muk
* the Source Creation and Management node. Right-click the template and choose ,t)mCgbcO
* Open. You can then make changes to the template in the Source Editor. mTs[3opg
*/ c4;
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package com.tot.count; # ^%'*/z
import java.util.*; +}^}
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/** kSI,Q!e\
* ?G8 D6
* @author 9_TZ;e
*/ @j^qT-0M
public class CountCache { _L:
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public static LinkedList list=new LinkedList(); 'z!I#Y!Y
/** Creates a new instance of CountCache */ u 6%56 %^f
public CountCache() {} *nH ?o* #
public static void add(CountBean cb){ Ebq5P$
if(cb!=null){ nQ/ha9v=n
list.add(cb); jMw;`yh
} g@1MImc'!
} moc_}(
} wefQmRK
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CountControl.java >\>HRyt%
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/* \kg2pF[V
* CountThread.java 2+Fq'!
* @<w$QD
* Created on 2007年1月1日, 下午4:57 c[j3_fn1]
* 2&=;$2?}
* To change this template, choose Tools | Options and locate the template under : ;d&m
* the Source Creation and Management node. Right-click the template and choose 1x\%VtO>\b
* Open. You can then make changes to the template in the Source Editor. |Yk23\!
*/ O:u^jcXA
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package com.tot.count; %n-LDn
import tot.db.DBUtils; }7&;YAt
import java.sql.*; ]Mtb~^joG
/** DE. Pw+5<.
* Fd ]! 7
* @author `T~M:\^D
*/ .JH3,L"S^
public class CountControl{ T!/$@]%\7
private static long lastExecuteTime=0;//上次更新时间 .j;My%)?p
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 );$~/H4
/** Creates a new instance of CountThread */ xorFz{
public CountControl() {} ;f6G&>p
public synchronized void executeUpdate(){ MiRMjQ2
Connection conn=null; s+0$_&xR
PreparedStatement ps=null; S&]JY
try{ r]8B6iV
conn = DBUtils.getConnection(); Omh(UHZBB
conn.setAutoCommit(false); j)J4[j
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9{>m04888
for(int i=0;i<CountCache.list.size();i++){ e"2 wXd_}
CountBean cb=(CountBean)CountCache.list.getFirst(); Mg;;o
CountCache.list.removeFirst(); 8LiRZ"
ps.setInt(1, cb.getCountId()); g3Ff<P P
ps.executeUpdate();⑴ P;A"`Il
//ps.addBatch();⑵ Gb8LW,$IT-
} F.T~txQ~u
//int [] counts = ps.executeBatch();⑶ (hmasy6hM
conn.commit(); -;Hd_ ~O>j
}catch(Exception e){ 9K)OQDv%6D
e.printStackTrace(); }F@`A?k
} finally{ q>H!?zi\Hy
try{ JU"!qXQr
if(ps!=null) { 3`="4
ps.clearParameters(); tuUk48!2I
ps.close(); 5+ VdZ'@
ps=null; 3 :f5xF
} 9hLPo
}catch(SQLException e){} _ sM$O>
DBUtils.closeConnection(conn); *rW] HNz
} N%>/
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} m;[z)-&"
public long getLast(){ )Oa"B;\j
return lastExecuteTime; *]F3pP[
} Url8Z\;aM
public void run(){ b Z%[ON5OY
long now = System.currentTimeMillis(); A0&~U0*(~
if ((now - lastExecuteTime) > executeSep) { 8xL-j2w
//System.out.print("lastExecuteTime:"+lastExecuteTime); qjTz]'^BpM
//System.out.print(" now:"+now+"\n"); 'jmcS0f
-
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %f,
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lastExecuteTime=now; T@k&YJ
executeUpdate(); KWXJ[#E<W
} %L~X\M:Qk
else{ !fz`O>-mZ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); lt(,/
} ^\_`0%`>
} pY-izML
} U:8^>_
//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 UVU}
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类写好了,下面是在JSP中如下调用。 s-k-|4
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<% +Mg^u-(A
CountBean cb=new CountBean(); )w/f 'fq
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); yhUc]6`V.H
CountCache.add(cb); J'2R-CI,
out.print(CountCache.list.size()+"<br>"); 9lny[ {9
CountControl c=new CountControl(); +n)(\k{
c.run(); OE:t!66
out.print(CountCache.list.size()+"<br>"); PqvwM2}4
%>