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: dijHi
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CountBean.java X@@7Qk
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/* ;VPYWss
* CountData.java m2to94yh
* gg
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* Created on 2007年1月1日, 下午4:44 "'U]4Z%q!
* 5Fa/Q>N
* To change this template, choose Tools | Options and locate the template under -W)8Z.
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. w#RfD
*/ gPy}.g{tH$
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package com.tot.count; bN.U2 %~!
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/** e1 P(-V
* 6Zq7O\
* @author | <- t
*/ wZ~eE'zx+
public class CountBean { nbSu|sX~r5
private String countType; WizVw&Iv
int countId; v'u}%FC
/** Creates a new instance of CountData */ XM?C7/^k
public CountBean() {} 3qrjb]E%}
public void setCountType(String countTypes){ b@)nB
this.countType=countTypes; #e$vv!&}
} )F%zT[Auph
public void setCountId(int countIds){ 4d
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this.countId=countIds; @s~*>k#"#
} v^1n.l %E
public String getCountType(){ 4XArpKA
return countType; u$y5?n|
} wy#5p]!u
public int getCountId(){ g42Z*+P6N
return countId; RRR=R]
} )zvjsx*e=J
} O}q(2[*i
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CountCache.java t3;QF
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/* 0tP{K
* CountCache.java H@ .1cO
* <|4L+?_(&
* Created on 2007年1月1日, 下午5:01 _qq>-{-Ym
* L
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* To change this template, choose Tools | Options and locate the template under NPE7AdB8
* the Source Creation and Management node. Right-click the template and choose U7d05y'
* Open. You can then make changes to the template in the Source Editor. 2B=+p83<
*/ iLJBiZ+
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package com.tot.count; %1%@L7wP>
import java.util.*; ]j^rJ|WTH
/** OJPi*i 5*
* \$D41_Wt|
* @author S+//g+e|f
*/ #l-/!j
public class CountCache { ? ]hS^&
public static LinkedList list=new LinkedList(); (/3E,6gMk^
/** Creates a new instance of CountCache */ >7nOR
public CountCache() {} >Ms_bfSK
public static void add(CountBean cb){ @7OE:& #V
if(cb!=null){ 3Vb/Mn!k
list.add(cb); bn0Rv
} aq%i:};
} iGsD!2
} h
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CountControl.java ;&]oV`Ib
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/* UViWejA/*u
* CountThread.java Ln&CB!u
* #F6!x3Z
* Created on 2007年1月1日, 下午4:57 6gJc?+
* gL6.,4q+1
* To change this template, choose Tools | Options and locate the template under rJ fO/WK
* the Source Creation and Management node. Right-click the template and choose (j884bu
* Open. You can then make changes to the template in the Source Editor. Qe1WT T]:I
*/ s f<NC>-
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package com.tot.count; 3\&I7o3V
import tot.db.DBUtils; cg'z:_l
import java.sql.*; wTPHc:2
/** #]FJx
* OK=ANQjs(
* @author .vhEm6wJUM
*/ EF[I@voc
public class CountControl{ Ebytvs,w
private static long lastExecuteTime=0;//上次更新时间 #kPsg9Y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 @w@ `-1
/** Creates a new instance of CountThread */ $z'_Hr'
public CountControl() {} :,Ad1(
public synchronized void executeUpdate(){ u13v@<HGc
Connection conn=null; FpFkZFtG'm
PreparedStatement ps=null; .V?>Jhok
try{ SyCa~M!}>
conn = DBUtils.getConnection(); yDXW#q
conn.setAutoCommit(false); pJPP6Be<
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); x$/:%"E
for(int i=0;i<CountCache.list.size();i++){ hR%2[lBn!]
CountBean cb=(CountBean)CountCache.list.getFirst(); 3[}w#n1
CountCache.list.removeFirst(); K{[N.dX(
ps.setInt(1, cb.getCountId()); Q804_F
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ps.executeUpdate();⑴ !:9s>0';N
//ps.addBatch();⑵
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} )5U2-g#U
//int [] counts = ps.executeBatch();⑶ "IKbb7x
conn.commit(); LXx`Vk>ky
}catch(Exception e){ e?
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e.printStackTrace(); &<oDl_^
} finally{ #i0f}&
try{ QsH?qI&2jp
if(ps!=null) { eCXw8
ps.clearParameters(); :}p<Hq 8Z
ps.close(); 8I,/ysT:
ps=null; X UcM~U-
} \K(QE ~y'W
}catch(SQLException e){} |FxTP&8~
DBUtils.closeConnection(conn); f`"@7-N
} 1n|K
} $qy ST
public long getLast(){ f,QBj{M,
return lastExecuteTime; +a}>cAj*
} DS6g_SS3
public void run(){ +n&9ZCH
long now = System.currentTimeMillis(); *-.,QpgTX
if ((now - lastExecuteTime) > executeSep) { 7)37AK w
//System.out.print("lastExecuteTime:"+lastExecuteTime); S7WT`2
//System.out.print(" now:"+now+"\n"); |;MW98 A
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); >\5I B5'j
lastExecuteTime=now; (=/}i'
executeUpdate(); wl:[Ad
} 4'BZ +A,p
else{ pQ yH`
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); R1NwtnS
} `/L D:R
} TwLQ;Q
} 7bC)Co#:
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 { K*
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类写好了,下面是在JSP中如下调用。 1]]#HTwX
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<% RLr^6+v)U
CountBean cb=new CountBean(); ?-D'xqc
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ~sbn"OS+
CountCache.add(cb); nh?~S`
out.print(CountCache.list.size()+"<br>"); fMZzR|_18
CountControl c=new CountControl(); `}|$eF&
c.run(); `as6IMqJD
out.print(CountCache.list.size()+"<br>"); Z}s56{!.
%>