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: ?mS798=f
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CountBean.java Ki}PO`s
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/* fGb(=l
* CountData.java IV_uf
* -N^}1^gA
* Created on 2007年1月1日, 下午4:44 Qbfm*JP~
* P1=bbMk
* To change this template, choose Tools | Options and locate the template under 6tI7vLmG
* the Source Creation and Management node. Right-click the template and choose hE-`N,i}
* Open. You can then make changes to the template in the Source Editor. m,aJ(8G
*/ iyU@|^B"Wa
=#n05*^
package com.tot.count; e"hm|'
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/** V\%;S
* f!e8xDfA
* @author #>O,w0<qM
*/ Wra*lQb/B
public class CountBean { $iDatQ[
private String countType; UF=5k~7<b
int countId; 3=@7:4 A
/** Creates a new instance of CountData */ !Zgb|e8<
public CountBean() {} jii2gtu'U
public void setCountType(String countTypes){ X_+`7yCi"x
this.countType=countTypes; AvRZf-Geg
} Crh5^?
public void setCountId(int countIds){ ~ygiKsD6b
this.countId=countIds; [=u8$5/a
} Q#urx^aw
public String getCountType(){ JM -Tp!C>
return countType; U }MU>kzb
} HI#}M|4n
public int getCountId(){ u9"b,].b
return countId; 'IFbD["r
} je9[S_Z:Y
} _a8^AG
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CountCache.java TgJx%
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/* 1sYwFr 5
* CountCache.java HB {w:
* (<s7X$(]e
* Created on 2007年1月1日, 下午5:01 R+P,kD?
* %Ub"V\1
* To change this template, choose Tools | Options and locate the template under C"k8M\RW?
* the Source Creation and Management node. Right-click the template and choose k7>* fQ89@
* Open. You can then make changes to the template in the Source Editor. 6.~HbN
*/ !sEI|47{
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package com.tot.count; )"|'=
import java.util.*; (k6=o';y
/** /],:sS7
* P9:7_Vc
* @author !w]!\H
*/ y1cAw
public class CountCache { 6=Kl[U0Y
public static LinkedList list=new LinkedList(); RZjTUMAz4
/** Creates a new instance of CountCache */ [WXtR
public CountCache() {} dE_BV=H{
public static void add(CountBean cb){ ~e{AgY)
if(cb!=null){ .Di+G-#aEs
list.add(cb); g~h`wv'
}
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} v+znKpE
} ^TVy:5Ag
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CountControl.java 50rCW)[#
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/* W>K2d
* CountThread.java zv <,
* Of7j~kdh83
* Created on 2007年1月1日, 下午4:57 7n,nODbJ
* 3F5r3T6j}
* To change this template, choose Tools | Options and locate the template under vUS$DUF
* the Source Creation and Management node. Right-click the template and choose uZz^>*b
* Open. You can then make changes to the template in the Source Editor. Z$X2*k6PK
*/ 37?%xQ!
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package com.tot.count; 9Vxsv*OR,
import tot.db.DBUtils; xVuGeanCv
import java.sql.*; v[e$RH
/** &sR{3pC}
* _:+W0YS
* @author D2E~c? V
*/ D`3}j
public class CountControl{ vpvPRwJ
private static long lastExecuteTime=0;//上次更新时间 ZL #4X*zT
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Cj"k
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/** Creates a new instance of CountThread */ #AyM!
public CountControl() {} @bmu4!"d
public synchronized void executeUpdate(){ SY`NZJK
Connection conn=null; f5
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PreparedStatement ps=null; hx+a.N
try{ kMo;<Z
conn = DBUtils.getConnection(); U;i:k%Bzy
conn.setAutoCommit(false); pTOS}A[dh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ?q7VB
for(int i=0;i<CountCache.list.size();i++){ t2BkQ8vr
CountBean cb=(CountBean)CountCache.list.getFirst(); bICi'`
CountCache.list.removeFirst(); MkC25
ps.setInt(1, cb.getCountId()); W~.1f1)
ps.executeUpdate();⑴ WfhQi;r
//ps.addBatch();⑵
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} E$ q/4
//int [] counts = ps.executeBatch();⑶ G<4H~1?P
conn.commit(); r|fJ~0z
}catch(Exception e){ A{: a kK
e.printStackTrace(); Z=z'j8z3
} finally{ |08 tQ
try{ QV L92"
if(ps!=null) { :o*{.
ps.clearParameters(); ~YlbS-
ps.close(); AVOqW0Z+y
ps=null; 8 fVI33
} "6Nma)8
}catch(SQLException e){} j()_
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DBUtils.closeConnection(conn); M< *5Y43
} U.crRrN
} 1zGEf&rv:
public long getLast(){ (toGU
return lastExecuteTime; 1MRt_*N4
} xh#ef=Bw
public void run(){ JZD27[b
long now = System.currentTimeMillis(); uDafPTF
if ((now - lastExecuteTime) > executeSep) { FGr0W|?v
//System.out.print("lastExecuteTime:"+lastExecuteTime); ] \4-e2N`\
//System.out.print(" now:"+now+"\n"); :V HJD
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); uB
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lastExecuteTime=now; tJUMLn?
executeUpdate(); U/&?rY^|
} $ZK4Ps -$
else{ GTYGm
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); D(~6h,=m
} |LcN_,}6
} cwz
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} KB&t31aq
//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 @>qzRo
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类写好了,下面是在JSP中如下调用。 g/lv>*+gS
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<% NrgN{6u;
CountBean cb=new CountBean(); }qmZ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 59$mfW
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CountCache.add(cb); 7_E+y$i=
out.print(CountCache.list.size()+"<br>"); 6^mO<nB
CountControl c=new CountControl(); HMgZ&v
c.run(); Q6MDhv,
out.print(CountCache.list.size()+"<br>"); _R8)%<E
%>