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: (x
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CountBean.java 2VzYP~Jg
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/* DD2K>1A1
* CountData.java Q':hmulT!
* Z&O6<=bg!
* Created on 2007年1月1日, 下午4:44 A=3L_
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* 0` .5gxm
* To change this template, choose Tools | Options and locate the template under l0C`teO
* the Source Creation and Management node. Right-click the template and choose YS_3Cq
* Open. You can then make changes to the template in the Source Editor. n*Uk<_WA
*/ HItNd
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package com.tot.count; uFhaN\S
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/** C!|LGzs0
* Nte$cTjX
* @author }Ba_epM
*/ K|YB)y
public class CountBean { "F%JZO51
private String countType; {`Gd
int countId; X'-Yz7J?o
/** Creates a new instance of CountData */ 1X&.po
public CountBean() {} SiUu**zC
public void setCountType(String countTypes){ 8xg^="OJ
this.countType=countTypes; s8)`wH?
} vENf3;o0
public void setCountId(int countIds){ I}m20|vv
this.countId=countIds; [iEz?1.,
} MM_:2 ^P)
public String getCountType(){ ;0Pv49q
return countType; 'It8h$^j
} Xh>($ U
public int getCountId(){ ~7 U~
return countId; *67K_<bp]
} 6tndC
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} #,u|*O:
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CountCache.java 10i$ b<O
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/* |PlNVd2
* CountCache.java uO`MA%
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* @(~:JP?KNC
* Created on 2007年1月1日, 下午5:01 r]UF<*$
* Z sTtSM\Ac
* To change this template, choose Tools | Options and locate the template under hg(<>_~
* the Source Creation and Management node. Right-click the template and choose Ca
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* Open. You can then make changes to the template in the Source Editor. qfyZda0d
*/ {VE
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package com.tot.count; iBd6&?E?<
import java.util.*; M[gL7-%w\
/** +ti ?7|bK<
* Zn'tNt/
* @author `daqzn
*/ 67YC;J]n=z
public class CountCache { akxNT_
public static LinkedList list=new LinkedList(); (Z
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/** Creates a new instance of CountCache */ RhH1nf2UR
public CountCache() {} ?
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public static void add(CountBean cb){ \A"o[A2v
if(cb!=null){ C/Khp +
list.add(cb); >H!Mx_fDL
} 6:]N%
} :x)H!z
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} "y,YC M`
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CountControl.java g[3LPKQ
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/* 0jf6 z-4
* CountThread.java QEhn
* DK)W
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* Created on 2007年1月1日, 下午4:57 ej`%}e%2
* @1JwjtNk
* To change this template, choose Tools | Options and locate the template under LH8jT
* the Source Creation and Management node. Right-click the template and choose `hi=y BO
* Open. You can then make changes to the template in the Source Editor. :$MOdL[ir
*/
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package com.tot.count; #) aLD0p
import tot.db.DBUtils; Ey&H?OFiP
import java.sql.*; QF#w$%7
/** {ALEK
* T{k
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* @author 1i y$ n
*/ N+|NI?R?}
public class CountControl{ Tlsh[@Q
private static long lastExecuteTime=0;//上次更新时间 WQK<z!W5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 7A)\:k
/** Creates a new instance of CountThread */ /BL:"t@-
public CountControl() {} P[nc8z[
public synchronized void executeUpdate(){ XA>W>|
Connection conn=null; 5p;AON
PreparedStatement ps=null; 2$JGhgDI
try{ cO~<iy
conn = DBUtils.getConnection(); VY0.]t
conn.setAutoCommit(false); ]pax,|+$C
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Z*%;;&?
for(int i=0;i<CountCache.list.size();i++){ m&UP@hUV-
CountBean cb=(CountBean)CountCache.list.getFirst(); xM*_1+<dT$
CountCache.list.removeFirst(); eUyF<j
ps.setInt(1, cb.getCountId()); ^SdF\uk{?6
ps.executeUpdate();⑴ 'wND
//ps.addBatch();⑵ )h{&O
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} MMM
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//int [] counts = ps.executeBatch();⑶ kRp]2^}\s\
conn.commit(); )ZG;.j
}catch(Exception e){ X 'Ss#s>g
e.printStackTrace(); \Pg~j\;F]
} finally{ 37#&:[w>
try{ ALF0d|>=uj
if(ps!=null) { CVj^{||eF
ps.clearParameters(); |VBt:dd<
ps.close(); oxwbq=a6yV
ps=null; @T'^V0!-q:
} 1^~&"s U
}catch(SQLException e){} zC?'Qiuh*
DBUtils.closeConnection(conn); l& :EKh
} /sE,2X*BT
} Pf*6/7S:
public long getLast(){ K`4rUEf}V"
return lastExecuteTime; ~f/|bcep
} D!<F^mtl
public void run(){ *$tXm4
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long now = System.currentTimeMillis(); =$>=EBH,cm
if ((now - lastExecuteTime) > executeSep) { ]g_VPx"
//System.out.print("lastExecuteTime:"+lastExecuteTime); 4ot<Uw5
//System.out.print(" now:"+now+"\n");
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); DeO-@4+qKd
lastExecuteTime=now; ZlT }cA/n
executeUpdate(); !FEc:qH
} x.Sf B[SZ
else{ KkvcZs'4m
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =Tj{)=^/#
} H;Wrcf2
} _jWs(OmJ
} N5
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//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 nzq
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类写好了,下面是在JSP中如下调用。 xL}i9ozZ
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<% LUOjaX
CountBean cb=new CountBean(); <r%K i`u(p
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ( }-*irSsj
CountCache.add(cb); ;kFD769DLw
out.print(CountCache.list.size()+"<br>"); ]e>qvSuYh
CountControl c=new CountControl(); wQ_4_W
c.run(); agIqca;
out.print(CountCache.list.size()+"<br>"); +8Xjk\Hi
%>