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 oh@ (%
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CountBean.java
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/* gv/yfiA?
* CountData.java RKwuvVI
* ?/^{sW'
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* Created on 2007年1月1日, 下午4:44 ad`=A V ]
* Jp +h''t
* To change this template, choose Tools | Options and locate the template under Ql?>,FZ
* the Source Creation and Management node. Right-click the template and choose F7U$7(I2G
* Open. You can then make changes to the template in the Source Editor. F{F SmUxzK
*/ JwcC9
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package com.tot.count; Zl{DqC^
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/** Sbjc8V ut
* PAs.T4Av^
* @author ZG1 {"J/z
*/ 2GJp`2(%dA
public class CountBean { AqjEz+TVt
private String countType; y.?Q
int countId; ANXN.V
/** Creates a new instance of CountData */ K"g`,G6S
public CountBean() {} vKTCS
public void setCountType(String countTypes){ !=(M P:
this.countType=countTypes; .
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} qaEWK0
public void setCountId(int countIds){ js)I%Z
this.countId=countIds; {z7kW@c
} G|)fZQ1nS
public String getCountType(){ _>i<` k
return countType; ?oQAxb&
} [OQ+&\
public int getCountId(){ 7hfa?Mcz
return countId; R1C2d +L
} bVYsPS
} I8LoXY
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CountCache.java m9Hdg^L
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/* ?CZ*MMV
* CountCache.java #4ii!ev
* QS2~}{v
* Created on 2007年1月1日, 下午5:01 #5mnSky+s
* A?Gk8
* To change this template, choose Tools | Options and locate the template under Mx=L lC)
* the Source Creation and Management node. Right-click the template and choose :1e'22[=.
* Open. You can then make changes to the template in the Source Editor. 6Y/TqI[
*/ }7Y@u@R
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package com.tot.count; J]qx4c
import java.util.*; hdurT
/** ~A-VgBbU>_
* ~+O ws
* @author l5,}yTUta
*/ bb"x^DtT
public class CountCache { _`q ei0
public static LinkedList list=new LinkedList(); @-Ln* 3n
/** Creates a new instance of CountCache */ PZSi}j/
public CountCache() {} 5vj tF4}7!
public static void add(CountBean cb){ =\)qUs\z
if(cb!=null){ (Q ~<>
list.add(cb); ZIvP?:=!
} 6D1tRo
} q?Av5TFf
} 'tun;Y
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CountControl.java <!I^ xo[
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/* ~VaO,8&+L
* CountThread.java <"
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* Ol1P
* Created on 2007年1月1日, 下午4:57 >}>cJh6
* oSB0P
* To change this template, choose Tools | Options and locate the template under #;Z+X)
* the Source Creation and Management node. Right-click the template and choose >d#Ks0\&
* Open. You can then make changes to the template in the Source Editor. S}XVr?l2O
*/ %XK<[BF
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package com.tot.count; G~`nLC^Y
import tot.db.DBUtils; 1J O@G3,
import java.sql.*; #;9n_)
/** !UW{xHu
* _,5)
* @author ?)'+l
*/ HLp'^
public class CountControl{ S`Wau/7t
private static long lastExecuteTime=0;//上次更新时间 GXx/pBdy[4
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 }[8Nr+y
/** Creates a new instance of CountThread */ vV 7L
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public CountControl() {} IL N0/eH
public synchronized void executeUpdate(){ 7P7d[KP<
Connection conn=null; %eLf6|1x
PreparedStatement ps=null; ro*$OLc/
try{ O7GJg;>?
conn = DBUtils.getConnection(); L4H5#?'
conn.setAutoCommit(false); 8cv [|`<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); a0[Mx 4
for(int i=0;i<CountCache.list.size();i++){ CAV
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CountBean cb=(CountBean)CountCache.list.getFirst();
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CountCache.list.removeFirst(); 'Z ,T,zW
ps.setInt(1, cb.getCountId()); JBvP {5
ps.executeUpdate();⑴ )6,Pmq~)
//ps.addBatch();⑵ +q@g
} sH{4 .tw
//int [] counts = ps.executeBatch();⑶ 0@*EwI
conn.commit(); ;c~%:|
}catch(Exception e){ fN{JLp
e.printStackTrace(); V(
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} finally{ R7-+@
try{ vqnFyd
if(ps!=null) { tA6x
ps.clearParameters(); ^=gzms
ps.close(); ?q+^U>wy&
ps=null; TWAt)Q"J
} n8vteGQ
}catch(SQLException e){} BA cnFO
DBUtils.closeConnection(conn); $Hbd:1%i
{
} Uv"O'Z
} @8xa"Dc
public long getLast(){ W!
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return lastExecuteTime; 8.R~Ys*
} u+/1ryp
public void run(){ E]IPag8C
long now = System.currentTimeMillis(); CPS1b
if ((now - lastExecuteTime) > executeSep) { J|GEt@o3
//System.out.print("lastExecuteTime:"+lastExecuteTime); NgPY/R>
//System.out.print(" now:"+now+"\n"); @&LtIN#
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); v05B7^1@_
lastExecuteTime=now; WjsE#9D!of
executeUpdate(); A~7q=-
} 0-a[[hL?
else{ VUE6M\&z>
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); q'~F6$kv5
} p{k^)5CR/
} 3 h~U)mg
} qz2j55j
//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 }m0hq+p^
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类写好了,下面是在JSP中如下调用。 #_}r)q
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<% Zn9ecN
CountBean cb=new CountBean(); {&Es3+{A
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); mbh;oX+
CountCache.add(cb); o$,Dh?l
out.print(CountCache.list.size()+"<br>"); <fm0B3i?
CountControl c=new CountControl(); I3$/#
c.run(); C~#ndl
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out.print(CountCache.list.size()+"<br>"); :ncR7:Z
%>