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: GJy><'J,!>
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CountBean.java _t:rWC"X
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/* >LgV[D#=&o
* CountData.java s)375jCga
* hs2f3;)
* Created on 2007年1月1日, 下午4:44 (vz)GrH>
* d7It}7@9
* To change this template, choose Tools | Options and locate the template under y:iE'SRRK6
* the Source Creation and Management node. Right-click the template and choose VpWax]'
* Open. You can then make changes to the template in the Source Editor. A8e b{qv
*/ [9z<*@$-
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package com.tot.count; ^+mSf`5
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/** G+m|A*[>
* A}~hc&J
* @author h[C!cX
*/ yf3%g\k
public class CountBean { yIXM}i:
private String countType; ^(N+s?
int countId; Q'*-gg&)
/** Creates a new instance of CountData */ <Sm=,Sw
public CountBean() {} k:m~'r8z
public void setCountType(String countTypes){ iWCN2om
this.countType=countTypes; u`gy1t `
} \
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public void setCountId(int countIds){ WT'P[RU2
this.countId=countIds; lLmVat(
} qnrf%rS
public String getCountType(){ +z>*m`}F
return countType; =H>rX
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} #MHnJ
public int getCountId(){ 9 ?MOeOV8
return countId; u 6la
} -*e$>w[.N
} >kz5azV0
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CountCache.java /B|#GJ\\3
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/* KKGAk\X
* CountCache.java YDi_Gl$
* oxPOfI1%]
* Created on 2007年1月1日, 下午5:01 v^[tK2&v
* .{5)$w>
* To change this template, choose Tools | Options and locate the template under s:*gjoL
* the Source Creation and Management node. Right-click the template and choose g}ciG!0
* Open. You can then make changes to the template in the Source Editor. xfkG&&
*/ z ]o&^Q
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package com.tot.count; K&BlWXT
import java.util.*; }YU#}Ip@
/** X2dTV}~i
* baR{
* @author %+gze|J
*/ {'"A hiR/
public class CountCache { 73Mh65
public static LinkedList list=new LinkedList(); r$k
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/** Creates a new instance of CountCache */ Ad@))o2
public CountCache() {} F8_pwJUpf-
public static void add(CountBean cb){ P%'bSx1
if(cb!=null){ ~UK)
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list.add(cb); fR6ot#b
} Jc`LUJT
} 7Ar4:iNvX
} *:
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CountControl.java eK/[jxNO
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/* JP!$uK{u
* CountThread.java 7<IrN\@U
* bxkp9o
* Created on 2007年1月1日, 下午4:57 1'c!9
* 4{CVBowi
* To change this template, choose Tools | Options and locate the template under hAG++<H{
* the Source Creation and Management node. Right-click the template and choose 6by5VESx
* Open. You can then make changes to the template in the Source Editor. )uwpeq$j7l
*/ {*
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package com.tot.count; ;?= ] ffa{
import tot.db.DBUtils; \ts:'
import java.sql.*; G{+sC2
/** =zqOkC
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* PS`)6yn{_
* @author ?h1]s&^|2
*/ hP3I_I[qF}
public class CountControl{ 5{,/m"-
private static long lastExecuteTime=0;//上次更新时间 zhHQJcQ.
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `u %//m_(
/** Creates a new instance of CountThread */ )P:TVe9`
public CountControl() {} u6t.$a!5
public synchronized void executeUpdate(){ pL-p
Connection conn=null; xzW]D0o0
PreparedStatement ps=null; ^uIZs}=+
try{ wbd>By(T1
conn = DBUtils.getConnection(); {-Yp~HQF
conn.setAutoCommit(false); GG(rp]rgl
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); U+~0m!|4
for(int i=0;i<CountCache.list.size();i++){ {(ey!O
CountBean cb=(CountBean)CountCache.list.getFirst(); uO,90g[C/R
CountCache.list.removeFirst(); 6D{|! i|r4
ps.setInt(1, cb.getCountId()); 1k{ E7eL
ps.executeUpdate();⑴ W $?1" F.
//ps.addBatch();⑵ eoTOccb!
} `o/tpuI
//int [] counts = ps.executeBatch();⑶ D'Byl,W$
conn.commit(); Uk|Xs~@#E
}catch(Exception e){ d?b2jZ$r]
e.printStackTrace(); )l[ +7
} finally{ UbY-)9==
try{ "LP4)hr_`
if(ps!=null) { q/70fR7{v
ps.clearParameters(); j#-ZL-N
ps.close(); -a&wOn-W
ps=null; <gf:QX!
} 2NIK0%6
}catch(SQLException e){} ;oob
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DBUtils.closeConnection(conn); saU|.\l
} <MT_zET
} ~u,g5
public long getLast(){ i1FFf[[ L
return lastExecuteTime; | =N8X
} lNqXx{!k
public void run(){
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long now = System.currentTimeMillis(); S U2`H7C*
if ((now - lastExecuteTime) > executeSep) { 1tQZyHc42;
//System.out.print("lastExecuteTime:"+lastExecuteTime); #3kR}Amow
//System.out.print(" now:"+now+"\n"); 2}~1poyi>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); CM9+h;Zm
lastExecuteTime=now; &>L\unS
executeUpdate(); ,o*b-Cv/
} [A*vl9=
else{ Gxm+5q
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |],{kUIXO
} ""CJlqU
} t!D=oBCro
} fm&l0
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 [#3:CDT
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类写好了,下面是在JSP中如下调用。 .Zf#L'Rf
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<% =*"Amd,
CountBean cb=new CountBean(); uW Q`
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ik7#Og~3
CountCache.add(cb); L_)?5IOJ$
out.print(CountCache.list.size()+"<br>"); 5!tmG- 'b
CountControl c=new CountControl(); ;)"r^M)):
c.run(); MSRIG-
out.print(CountCache.list.size()+"<br>"); -Ah \a0z
%>