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: 3\
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CountBean.java K\XQE50
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/* hif;atO
* CountData.java YlGUd~$`"+
* yUpN`;
* Created on 2007年1月1日, 下午4:44 YI"!&a'yj
* I
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* To change this template, choose Tools | Options and locate the template under V6HZvuXV!
* the Source Creation and Management node. Right-click the template and choose ,Ww}xmq1H
* Open. You can then make changes to the template in the Source Editor. <PuY"-`/Oc
*/ '/9j"mIA9$
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package com.tot.count; ?QJx!'Y,p
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/** FK~wr;[
* rOt{bh6r
* @author Sk!' 2y*@&
*/ T&>65`L
public class CountBean { r"h09suZBW
private String countType; Z$KyK.FUU
int countId; FZ+2{wIV^
/** Creates a new instance of CountData */ W,Q>3y*
public CountBean() {} RMT9tXe*5
public void setCountType(String countTypes){ 7sOAaWx
this.countType=countTypes; rA B=H*|6
} wbKJ:eWgt
public void setCountId(int countIds){ [7gz?9VyLF
this.countId=countIds; 2)|=+DN;
} #-G@ p
public String getCountType(){ Ot`%5<E^
return countType; fx(8 o+
} #<9'{i3
public int getCountId(){ % R25, V
return countId; $p0D9mF
} r/a@ x9
} gL&w:_
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CountCache.java vnQFq
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/* P[q>;Fx*
* CountCache.java %#v$d
* 6wwbH}*=?
* Created on 2007年1月1日, 下午5:01 NcF>}f,}\
* \EoE/2"<
* To change this template, choose Tools | Options and locate the template under BF gxa#De
* the Source Creation and Management node. Right-click the template and choose S}U_uZ$b
* Open. You can then make changes to the template in the Source Editor. Y 'X!T8
*/ "i/GzD7 `n
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package com.tot.count; $#s5y~z
import java.util.*; sGtxqnX:J
/** ?;`GCE
* JcmMbd&B
* @author v@[3R7|4
*/ \ 9V_[xD+
public class CountCache { m]MR\E5]By
public static LinkedList list=new LinkedList(); =lk'[P/p`
/** Creates a new instance of CountCache */ Eze w@*(
public CountCache() {} >"<s7$g
public static void add(CountBean cb){ w/(T
if(cb!=null){ (n?f016*%d
list.add(cb); _zM?"16I}
} KNQj U-A
} Y_ne?/sZE
} U9b[t
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CountControl.java SUMfebW5
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/* T?!SEblP]
* CountThread.java "'Fvt-<^S7
* IO8 @u;&
* Created on 2007年1月1日, 下午4:57 ,~Xe#eM
* |&WYu,QQ4
* To change this template, choose Tools | Options and locate the template under `V V>AA5
* the Source Creation and Management node. Right-click the template and choose TK'
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* Open. You can then make changes to the template in the Source Editor. af>i
*/ Y1sK sdV
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package com.tot.count; Zh;}Q(w
import tot.db.DBUtils; a-,*iK{_u
import java.sql.*; ?_AX;z
/** CStNCBZ|\
* O
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* @author U
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*/ <#M1I!R
public class CountControl{ X4hz\={
private static long lastExecuteTime=0;//上次更新时间 ivl %%nY'
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 lc5(^~
/** Creates a new instance of CountThread */ 6o6yx:
public CountControl() {} [olSgq!3
public synchronized void executeUpdate(){ (NR( )2
Connection conn=null; ojBdUG\
PreparedStatement ps=null; ~x'8T!M{
try{ |-{ Hy(9
conn = DBUtils.getConnection(); ;rL1[qwk
conn.setAutoCommit(false); 1:T"jsWw
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3)=ix. wW
for(int i=0;i<CountCache.list.size();i++){ .bp#YU,m
CountBean cb=(CountBean)CountCache.list.getFirst(); wY\,b*x
CountCache.list.removeFirst(); qlPIxd
ps.setInt(1, cb.getCountId()); UJL'4 t/
ps.executeUpdate();⑴
}+/Vk
//ps.addBatch();⑵ v:74iB$i/C
} V!]|u ^4I
//int [] counts = ps.executeBatch();⑶ 0$Mxu7 /
conn.commit(); {_\dwe9
}catch(Exception e){ 4NaT@68p
e.printStackTrace(); N6_1iIM
} finally{ Lhg
try{ VK*H1EH1
if(ps!=null) { O z(=%oS
ps.clearParameters(); 'M? ptu?f
ps.close(); z)*{bz]
ps=null; '*`n"cC:
} 7vPGb:y
}catch(SQLException e){} `]GL3cIh:
DBUtils.closeConnection(conn); $/Q\B(X3
} |p*cI @
} 8_`C&vx
public long getLast(){ K`X'Hg#_P2
return lastExecuteTime; "Zn
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} Z&H_+u3j
public void run(){ X5+^b({
long now = System.currentTimeMillis(); .sj/Lw}
if ((now - lastExecuteTime) > executeSep) { 5'{QMnfB
//System.out.print("lastExecuteTime:"+lastExecuteTime); UL~~J[1r
//System.out.print(" now:"+now+"\n"); -3d`e2^&}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Kt]vTn7!9
lastExecuteTime=now; ~LFM,@
executeUpdate(); "#8^":,4
} DrBkR`a?
else{ I}y6ke!
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ,:-^O#
} :D2GLq *\
} %O[1yZh
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} }4c$_
//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 a.O"I3{?h
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类写好了,下面是在JSP中如下调用。 ,_7m<(/f
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<% dYwEVu6q
CountBean cb=new CountBean(); w*@9:+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "J}B
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CountCache.add(cb); =/ !A
out.print(CountCache.list.size()+"<br>"); p ~+sk1[.
CountControl c=new CountControl(); ojj
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c.run(); Bv*VNfUm
out.print(CountCache.list.size()+"<br>"); +Ezl.O@z
%>