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: 0h^uOA; c
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CountBean.java FMoJ"6Q
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/* $|rCrak;
* CountData.java [+y&HNf
* fBf]4@{
* Created on 2007年1月1日, 下午4:44 _cR6ik zW(
* NS
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* To change this template, choose Tools | Options and locate the template under 3T"2S[gT
* the Source Creation and Management node. Right-click the template and choose Pa3{Ds
* Open. You can then make changes to the template in the Source Editor. I+*osk
*/ B^H4Q
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package com.tot.count; >y]?MGk
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/** ;&RUE
* pi|\0lH6W
* @author iK ohuZr
*/ ]U_5\$
public class CountBean { b*cW<vX}~
private String countType; 3gC\{y!8
int countId; dv}8YH["
/** Creates a new instance of CountData */ Ti hnSb
public CountBean() {} {F<)z%^
public void setCountType(String countTypes){ )>ug{M%g
this.countType=countTypes; "w>rlsT<O
} o^8*aH)I>Y
public void setCountId(int countIds){ 4 U3C~J
this.countId=countIds; Tw2Xe S
} =g/4{IL%
public String getCountType(){ :8](&B68gE
return countType; -K:yU4V
} Y=AH%Gy9)
public int getCountId(){ >/(i3)
return countId; AqKHjCI
} -b@v0%Q2M*
} E7V38Z
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CountCache.java k}- "0>
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/* lq;
* CountCache.java /7c2OI=\
* mk#>Dpy?
* Created on 2007年1月1日, 下午5:01 r3n=<l!Jr
* UAnB=L,.\
* To change this template, choose Tools | Options and locate the template under ~D<7W4c
* the Source Creation and Management node. Right-click the template and choose Kl4isGcr]
* Open. You can then make changes to the template in the Source Editor. 7h(HG?2Y
*/ y2oB]^z&n
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package com.tot.count; KK@
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import java.util.*; K4iI:
/** eKL]E!
* !x`;>0
* @author ,O$Z,J4VL
*/ Mi;}.K0J
public class CountCache { =6.8bZT\
public static LinkedList list=new LinkedList(); :&xz5c`"04
/** Creates a new instance of CountCache */ 83mlZ1jQz
public CountCache() {} NYWG#4D
public static void add(CountBean cb){
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if(cb!=null){ m\<<oIlH
list.add(cb); !Sh^LYqn
} AM>Yj
} ck(CA(_
} j)g_*\tQ
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CountControl.java Zkf 3t>[
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/* ^</65+OT+
* CountThread.java r~ZS1Tp
* mle_*Gy8
* Created on 2007年1月1日, 下午4:57 r^?)F?n!
* L!CX&
* To change this template, choose Tools | Options and locate the template under hB|H9+
* the Source Creation and Management node. Right-click the template and choose (%``EIc<8
* Open. You can then make changes to the template in the Source Editor. !7ei1
*/ aK8bKlZe
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package com.tot.count; ^VSt9&
import tot.db.DBUtils; yw;ghP;
import java.sql.*; Fpy6"Z?z
/** ^n\9AE3
* L9E;Uii0
* @author o0zc}mm
*/ <;2P._oZ
public class CountControl{ 4yA9Ni
private static long lastExecuteTime=0;//上次更新时间 xi
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ti$oZ4PpF
/** Creates a new instance of CountThread */ N&6_8=3z
public CountControl() {} Z7tU0
public synchronized void executeUpdate(){ .`oJcJ
Connection conn=null; b&\3ps
PreparedStatement ps=null; /#S4espE
try{ W&fW5af9
conn = DBUtils.getConnection(); @4 zi]v
conn.setAutoCommit(false); ek<PISlci
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hQgk.$g
for(int i=0;i<CountCache.list.size();i++){ FRl3\ZDqrb
CountBean cb=(CountBean)CountCache.list.getFirst(); 'hwV
CountCache.list.removeFirst(); U%mkhWn
ps.setInt(1, cb.getCountId()); e%P+KX
ps.executeUpdate();⑴ 6F|Hg2tpz
//ps.addBatch();⑵ _n-VgPRn
} 3q~":bpAp
//int [] counts = ps.executeBatch();⑶ P!`Q_h6a
conn.commit(); 37j\D1Y
}catch(Exception e){ eT7!a']x
e.printStackTrace(); ?z \q Mu
} finally{ *r)zBr
try{ 21[K[ %
if(ps!=null) { tnQR<
ps.clearParameters(); 7Y-FUZ.`>
ps.close(); &+)+5z_d
ps=null; 47)+'`
} K;@RUy~
}catch(SQLException e){} 9_M H
DBUtils.closeConnection(conn); N0y;PVAGu
} J6@(X8w{j
} Nz(c"3T;
public long getLast(){ VxUvvJ{-v
return lastExecuteTime; Uv
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} .4S^nP
public void run(){ O:oU`vE
long now = System.currentTimeMillis(); .u&&H_ UmE
if ((now - lastExecuteTime) > executeSep) { KKeb ioW
//System.out.print("lastExecuteTime:"+lastExecuteTime); SY!`a:It
//System.out.print(" now:"+now+"\n"); !SLP8|Cd
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); C:'WX*W
lastExecuteTime=now; >< <$
executeUpdate(); <GL}1W"Ay
} ql#{=oGDnA
else{ >,w\lf9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); rh:s
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} !(MA5L-
} Z^/z
} VYl_U?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 bqw/O`*wfN
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类写好了,下面是在JSP中如下调用。
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ifJv~asp
<% J[j/aDdP
CountBean cb=new CountBean(); v7{ P].M
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); I2t-D1X
CountCache.add(cb); nvO%
out.print(CountCache.list.size()+"<br>"); EuKrYY] g
CountControl c=new CountControl(); ;#5-.z
c.run(); 7AGZu?1]M
out.print(CountCache.list.size()+"<br>"); )#b}qc#`
%>